JP2023050143A - Light-emitting element - Google Patents

Abstract

To provide a light-emitting element with excellent luminous efficiency.SOLUTION: A light-emitting element includes an anode, a cathode, and a first layer, a second layer, and a third layer that are provided between the anode and the cathode.SELECTED DRAWING: None

Description

The present disclosure relates to light emitting devices.

A light-emitting device such as an organic electroluminescence device can be suitably used for display and lighting applications. For example, Patent Document 1 describes a light-emitting element having a light-emitting layer containing a metal complex and compound B1. Note that this light-emitting element is a light-emitting element having only one layer containing a polymer compound.

WO2020/203209

However, the above light-emitting element does not always have sufficient light emission efficiency.
Accordingly, an object of an embodiment of the present disclosure is to provide a light-emitting element with excellent luminous efficiency.

The present disclosure provides the following [1] to [17].

[1] A light-emitting device having an anode, a cathode, and a first layer, a second layer, and a third layer provided between the anode and the cathode,
The first layer is
selected from the group consisting of a metal complex represented by the formula (1) and a polymer compound (A) containing a structural unit having a group obtained by removing one or more hydrogen atoms from the metal complex represented by the above formula (1) and at least one
A low-molecular-weight compound (B) having a condensed heterocyclic skeleton (b) containing a boron atom and at least one selected from the group consisting of an oxygen atom, a sulfur atom, a selenium atom, an ^sp3 carbon atom and a nitrogen atom in the ring and at least one selected from the group consisting of a polymer compound (B) containing a structural unit having a group obtained by removing one or more hydrogen atoms from the low-molecular-weight compound (B);
is a layer containing
wherein the second layer and the third layer are a structural unit represented by formula (ET-1), a structural unit represented by formula (ET-2), a structural unit represented by formula (X); A polymer containing at least one structural unit selected from the group consisting of structural units represented by the formula (Y), structural units represented by the formula (Z), and structural units represented by the formula (Z′) A light-emitting element, which is a layer formed using a compound.

[In the formula,
M represents a rhodium atom, a palladium atom, an iridium atom or a platinum atom.
ⁿ¹ represents an integer of 1 or more, and ⁿ² represents an integer of 0 or more. However, n ¹ +n ² is 3 when M is a rhodium atom or an iridium atom, and n ¹ +n ² is 2 when M is a palladium atom or a platinum atom.
E ¹ and E ² each independently represent a carbon atom or a nitrogen atom. When multiple E ¹ and E ² are present, they may be the same or different.
Ring L ¹ represents an aromatic heterocycle, and the ring may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple rings L ¹ are present, they may be the same or different.
Ring ^L2 represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and these rings may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When there is more than one ring ^L2 , they may be the same or different.
The substituent that ring L ¹ may have and the substituent that ring L ² may have may be the same or different, and are bonded to each other to form a ring together with the atoms to which they are bonded. may be formed.
A ¹ -G ¹ -A ² represents an anionic bidentate ligand. A ¹ and A ² each independently represent a carbon atom, an oxygen atom or a nitrogen atom, and these atoms may be atoms constituting a ring. G ¹ represents a single bond or an atomic group forming a bidentate ligand together with A ¹ and A ² . When multiple A ¹ -G ¹ -A ² are present, they may be the same or different. ]

[In the formula,
nE1 represents an integer of 1 or more.
Ar ^E1 represents an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent.
R ^E1 represents a group represented by formula (ES-1). When multiple R ^E1 are present, they may be the same or different. ]

-R ^E3 - {(Q ^E1 ) _nE3 - Y ^E1 (M ^E1 ) _aE1 (Z ^E1 ) _bE1 } _mE1 (ES-1)
[In the formula,
nE3 and bE1 each independently represent an integer of 0 or greater, and aE1 and mE1 each independently represent an integer of 1 or greater. When multiple nE3, aE1 and bE1 are present, they may be the same or different. However, mE1 is 1 when R ^E3 is a single bond. aE1 and bE1 are selected so that the charge of the group represented by formula (ES-1) above is zero.
R ^E3 represents a single bond, a hydrocarbon group, a heterocyclic group or O—R ^E3 ' (R ^E3 ' represents a hydrocarbon group or a heterocyclic group), and these groups have a substituent; may
Q ^E1 represents an alkylene group, a cycloalkylene group, an arylene group, an oxygen atom or a sulfur atom, and these groups may have a substituent. When multiple Q ^E1 are present, they may be the same or different.
Y ^E1 represents -CO ₂ ^- , -SO ₃ ^- , -SO ₂ ^- or -PO ₃ ^2- . When multiple Y ^E1 are present, they may be the same or different.
M ^E1 represents an alkali metal cation, an alkaline earth metal cation or an ammonium cation, and the ammonium cation may have a substituent. When multiple M ^E1 are present, they may be the same or different.
Z ^E1 is F ⁻ , Cl ⁻ , Br ⁻ , I ⁻ , OH ⁻ , B(R ^E4 ) ₄ ⁻ , R ^E4 SO ₃ ⁻ , R ^E4 COO ⁻ , NO ₃ ⁻ , SO ₄ ²⁻ , HSO ₄ ⁻ , PO ₄ ^3- , HPO ₄ ^2- , H ₂ PO ₄ ^- , BF ₄ ^- or PF ₆ ^- . R ^E4 represents an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent. When multiple Z ^E1 are present, they may be the same or different. ]

[In the formula,
nE2 represents an integer of 1 or more.
Ar ^E2 represents an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent.
R ^E2 represents a group represented by formula (ES-2). When multiple R ^E2 are present, they may be the same or different. ]

-R ^E5 - {(Q ^E2 ) _nE4 - Y ^E2 (M ^E2 ) _aE2 (Z ^E2 ) _bE2 } _mE2 (ES-2)
[In the formula,
nE4 and bE2 each independently represent an integer of 0 or greater, and aE2 and mE2 each independently represent an integer of 1 or greater. When multiple nE4, aE2 and bE2 are present, they may be the same or different. However, mE2 is 1 when R ^E5 is a single bond. aE2 and bE2 are selected so that the charge of the group represented by formula (ES-2) above is zero.
R ^E5 represents a single bond, a hydrocarbon group, a heterocyclic group or O—R ^E5 ' (R ^E5 ' represents a hydrocarbon group or a heterocyclic group), and these groups have a substituent; may
Q ^E2 represents an alkylene group, a cycloalkylene group, an arylene group, an oxygen atom or a sulfur atom, and these groups may have a substituent. When multiple Q ^E2 are present, they may be the same or different.
Y ^E2 represents -C ⁺ R ^E6 ₂ , -N ⁺ R ^E6 ₃ , -P ⁺ R ^E6 ₃ , -S ⁺ R ^E6 ₂ or -I ⁺ R ^E6 ₂ . R ^E6 represents a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent. A plurality of R ^E6 may be the same or different. When multiple Y ^E2 are present, they may be the same or different.
M ^E2 is F ⁻ , Cl ⁻ , Br ⁻ , I ⁻ , OH ⁻ , B(R ^E7 ) ₄ ⁻ , R ^E7 SO ₃ ⁻ , R ^E7 COO ⁻ , BF ₄ ⁻ , SbCl ₆ ⁻ or SbF ₆ ⁻ show. R ^E7 represents an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent.
When multiple M ^E2 are present, they may be the same or different.
Z ^E2 represents an alkali metal cation or an alkaline earth metal cation. When multiple Z ^E2 are present, they may be the same or different. ]

[In the formula,
a ^X1 and a ^X2 each independently represent an integer of 0 or more.
Ar ^{1 X1} and Ar 2 ^X3 each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
Ar ^X2 and Ar ^X4 each independently represent an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded; and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple Ar ^X2 are present, they may be the same or different. When multiple Ar ^X4 are present, they may be the same or different.
R ^X1 , R ^X2 and R ^X3 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple R ^X2 are present, they may be the same or different. When multiple R ^X3 are present, they may be the same or different. ]

[Wherein, Ar ^Y represents an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded, The group may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. ]

[In the formula,
n represents an integer of 1 or more.
nA represents an integer of 0 or more. When multiple nAs are present, they may be the same or different.
Ar ^Z represents a hydrocarbon group, a heterocyclic group, or a group in which at least one hydrocarbon group and at least one heterocyclic group are directly bonded, and these groups may have a substituent good. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
L ^A represents an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, a group represented by -N(R')-, an oxygen atom or a sulfur atom, and these groups have a substituent. You may have When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. R' represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple L ^A are present, they may be the same or different.
X represents a cross-linking group. When there are multiple X's, they may be the same or different. ]

[In the formula,
mA, m and c each independently represent an integer of 0 or more. When multiple mA are present, they may be the same or different. When there are multiple m's, they may be the same or different.
Ar ⁵ represents a hydrocarbon group, a heterocyclic group, or a group in which at least one hydrocarbon group and at least one heterocyclic group are directly bonded, and these groups may have a substituent good. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple Ar ⁵ are present, they may be the same or different.
Ar ⁴ and Ar ⁶ each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
K ^A represents an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, a group represented by -N(R'')-, an oxygen atom or a sulfur atom, and these groups are substituents. may have. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. R'' represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple K ^A are present, they may be the same or different.
X' represents a hydrogen atom, a bridging group, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple X' are present, they may be the same or different. However, at least one X' is a bridging group. ]
[2] The ring L ¹ is an aromatic heterocyclic ring containing a 5-membered ring or an aromatic heterocyclic ring containing a 6-membered ring, these rings may have a substituent, and the ring L ² is an aromatic hydrocarbon ring containing a 5- or 6-membered ring, or an aromatic heterocyclic ring containing a 5- or 6-membered ring, and these rings may have a substituent [ 1].
[3] The ring L ¹ is a pyridine ring, diazabenzene ring, azanaphthalene ring, diazanaphthalene ring, diazole ring or triazole ring, and these rings may have a substituent, and the ring The light-emitting device according to [1] or [2], wherein ^L2 is a benzene ring, a pyridine ring, or a diazabenzene ring, and these rings may have a substituent.
[4] The ring L ¹ is a diazole ring or a triazole ring, these rings may have a substituent, and the ring L ² is a benzene ring, and these rings are substituents The light-emitting device according to any one of [1] to [3], which may have
[5] of [1] to [4], wherein the condensed heterocyclic skeleton (b) contains a boron atom and at least one selected from the group consisting of an oxygen atom, a sulfur atom and a nitrogen atom in the ring; The light-emitting device according to any one of the above.
[6] The light-emitting device according to [5], wherein the condensed heterocyclic skeleton (b) contains a boron atom and a nitrogen atom in the ring.
[7] The low-molecular-weight compound (B) is a compound represented by formula (1-1), a compound represented by formula (1-2), or a compound represented by formula (1-3). The light emitting device according to any one of [1] to [4].

[In the formula,
Ar ¹ , Ar ² and Ar ³ each independently represent an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
Y ¹ represents an oxygen atom, a sulfur atom, a selenium atom, a group represented by -N(Ry)-, an alkylene group or a cycloalkylene group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
Y ² and Y ³ each independently represent a single bond, an oxygen atom, a sulfur atom, a selenium atom, a group represented by -N(Ry)-, a group represented by -B(Ry)-, an alkylene group, It represents a cycloalkylene group, an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
Ry represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When two or more Ry are present, they may be the same or different.
Y ¹ and Ar ¹ may be directly bonded or bonded via a divalent group to form a ring. Y ¹ and Ar ² may be directly bonded or bonded via a divalent group to form a ring. Y ² and Ar ¹ may be directly bonded or bonded via a divalent group to form a ring. Y ² and Ar ³ may be directly bonded or bonded via a divalent group to form a ring. Y ³ and Ar ² may be directly bonded or bonded via a divalent group to form a ring. Y ³ and Ar ³ may be directly bonded or bonded via a divalent group to form a ring. ]
[8] The light emitting device according to [7], wherein Y ¹ , Y ² and Y ³ are an oxygen atom, a sulfur atom or a group represented by -N(Ry)-.
[9] The light-emitting device according to [7] or [8], wherein Y ¹ , Y ² and Y ³ are groups represented by -N(Ry)-.
[10] The second layer is a layer provided between the anode and the first layer, and the second layer is a structural unit represented by the formula (X), the formula (Y) Using a polymer compound containing at least one structural unit selected from the group consisting of a structural unit represented by a structural unit represented by the formula (Z) and a structural unit represented by the formula (Z′) The light-emitting device according to any one of [1] to [9], which is a formed layer.
[11] The third layer is a layer provided between the cathode and the first layer, and the third layer comprises a structural unit represented by formula (ET-1) and the formula ( Any one of [1] to [10], which is a layer formed using a polymer compound containing at least one structural unit selected from the group consisting of structural units represented by ET-2) The light-emitting device according to .
[12] the second layer is a layer provided between the anode and the first layer;
The third layer is a layer provided between the cathode and the first layer,
The third layer and the first layer are adjacent, and
The light-emitting device according to any one of [1] to [11], wherein the second layer and the first layer are adjacent to each other.
[13] The second layer and the third layer are layers provided between the anode and the first layer, and
The second layer and the third layer are the structural unit represented by the formula (X), the structural unit represented by the formula (Y), the structural unit represented by the formula (Z), and the structural unit represented by the formula (Z ') according to any one of [1] to [10], which is a layer formed using a polymer compound containing at least one structural unit selected from the group consisting of structural units represented by light-emitting element.
[14] the third layer is a layer provided between the anode and the second layer;
The third layer and the second layer are adjacent, and
The light-emitting device of [13], wherein the second layer and the first layer are adjacent.
[15] The light-emitting device according to any one of [1] to [14], wherein the cross-linking group is at least one cross-linking group selected from Group A of cross-linking groups.
(Crosslinking group A group)

[In the formula, R ^XL represents a methylene group, an oxygen atom or a sulfur atom, and n ^XL represents an integer of 0 to 5. When multiple R ^XL are present, they may be the same or different. When multiple ^nXL are present, they may be the same or different. *1 represents the binding position. These bridging groups may have substituents, and when there are multiple substituents, they may be the same or different, and are bonded to each other to form a ring together with the atoms to which they are bonded. may ]
[16] The first layer is selected from the group consisting of a compound represented by formula (H-1), and a structural unit represented by formula (X) and a structural unit represented by formula (Y) The light-emitting device according to any one of [1] to [15], further comprising at least one selected from the group consisting of polymer compounds containing at least one structural unit of

[In the formula,
Ar ^H1 and Ar ^H2 each independently represent an aryl group, a monovalent heterocyclic group or a substituted amino group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
n ^H1 represents an integer of 0 or more.
L ^H1 represents a divalent group, and the divalent group may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple L ^H1 are present, they may be the same or different, and they may be directly bonded to each other or bonded via a divalent group to form a ring.
Ar ^H1 and Ar ^H2 may be directly bonded or bonded via a divalent group to form a ring. L ^H1 and Ar ^H1 may be directly bonded or bonded via a divalent group to form a ring. L ^H1 and Ar ^H2 may be directly bonded or bonded via a divalent group to form a ring. ]

[In the formula,
a ^X1 and a ^X2 each independently represent an integer of 0 or more.
Ar ^{1 X1} and Ar 2 ^X3 each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
Ar ^X2 and Ar ^X4 each independently represent an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded; and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple Ar ^X2 are present, they may be the same or different. When multiple Ar ^X4 are present, they may be the same or different.
R ^X1 , R ^X2 and R ^X3 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple R ^X2 are present, they may be the same or different. When multiple R ^X3 are present, they may be the same or different. ]

[Wherein, Ar ^Y represents an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded, The group may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. ]
[17] The first layer further contains at least one selected from the group consisting of a hole-transporting material, a hole-injecting material, an electron-transporting material, an electron-injecting material, a light-emitting material, and an antioxidant, [1 ] to [16].

According to an embodiment of the present disclosure, it is possible to provide a light-emitting element with excellent luminous efficiency.

Preferred embodiments of the present disclosure are described in detail below.

<Description of common terms>
Terms commonly used in this specification have the following meanings unless otherwise specified.

"Room temperature" means 25°C.
Me is a methyl group, Et is an ethyl group, Bu is a butyl group, i-Pr is an isopropyl group, and t-Bu is a tert-butyl group.
A hydrogen atom may be a deuterium atom or a protium atom.
In the formulas representing the metal complexes, solid lines representing bonds with the central metal mean ionic bonds, covalent bonds or coordinate bonds.

A "low-molecular-weight compound" means a compound having no molecular weight distribution and a molecular weight of 1×10 ⁴ or less.
A "polymer compound" means a polymer having a molecular weight distribution and a polystyrene-equivalent number average molecular weight of 1×10 ³ or more (for example, 1×10 ³ to 1×10 ⁸ ).
A "structural unit" means a unit that exists at least one in a polymer compound. Two or more structural units present in a polymer compound are generally called "repeating units".
The polymer compound may be a block copolymer, a random copolymer, an alternating copolymer, a graft copolymer, or other forms.
The terminal group of the polymer compound is preferably a stable group from the viewpoint of the light emitting properties of the light emitting device of the present disclosure. The terminal group of the polymer compound is preferably a group conjugated to the main chain of the polymer compound, for example, an aryl group or 1 valent heterocyclic groups.

The "alkyl group" may be either linear or branched. The number of carbon atoms in the linear alkyl group is generally 1-50, preferably 1-20, more preferably 1-10, not including the number of carbon atoms in the substituents. The number of carbon atoms in the branched alkyl group is usually 3-50, preferably 3-20, more preferably 4-10, not including the number of carbon atoms in the substituent.
The alkyl group may have a substituent. Examples of alkyl groups include methyl group, ethyl group, propyl group, isopropyl group, butyl group, 2-butyl group, isobutyl group, tert-butyl group, pentyl group, isoamyl group, 2-ethylbutyl group, hexyl group and heptyl. group, octyl group, 2-ethylhexyl group, 3-propylheptyl group, decyl group, 3,7-dimethyloctyl group, 2-ethyloctyl group, 2-hexyldecyl group, dodecyl group, and hydrogen atoms in these groups Some or all of the groups substituted with substituents (e.g., trifluoromethyl group, pentafluoroethyl group, perfluorobutyl group, perfluorohexyl group, perfluorooctyl group, 3-phenylpropyl group, 3- (4-methylphenyl)propyl group, 3-(3,5-di-hexylphenyl)propyl group and 6-ethyloxyhexyl group).
The number of carbon atoms in the "cycloalkyl group" is usually 3-50, preferably 3-20, more preferably 4-10, not including the number of carbon atoms in the substituents.
A cycloalkyl group may have a substituent. Cycloalkyl groups include, for example, cyclohexyl groups and groups in which some or all of the hydrogen atoms in the groups are substituted with substituents.
The number of carbon atoms in the "alkylene group" is generally 1-20, preferably 1-15, more preferably 1-10, not including the number of carbon atoms in the substituents.
The alkylene group may have a substituent. The alkylene group includes, for example, methylene group, ethylene group, propylene group, butylene group, hexylene group, octylene group, and groups in which some or all of the hydrogen atoms in these groups are substituted with substituents.
The number of carbon atoms in the "cycloalkylene group" is usually 3 to 20, preferably 4 to 10, more preferably 5 to 7, not including the number of carbon atoms in substituents.
A cycloalkylene group may have a substituent. The cycloalkylene group includes, for example, a cyclohexylene group and a group in which some or all of the hydrogen atoms in the group are substituted with substituents.

“Aromatic hydrocarbon group” means a group obtained by removing one or more hydrogen atoms directly bonded to carbon atoms constituting a ring from an aromatic hydrocarbon. A group obtained by removing one hydrogen atom directly bonded to a carbon atom constituting a ring from an aromatic hydrocarbon is also referred to as an "aryl group". A group obtained by removing two hydrogen atoms directly bonded to carbon atoms forming a ring from an aromatic hydrocarbon is also referred to as an "arylene group".
The number of carbon atoms in the aromatic hydrocarbon group is generally 6-60, preferably 6-40, more preferably 6-20, not including the number of carbon atoms in the substituents.
The "aromatic hydrocarbon group" includes, for example, monocyclic aromatic hydrocarbons (e.g., benzene), or polycyclic aromatic hydrocarbons (e.g., naphthalene, indene, naphthoquinone, indenone and tetralone; tricyclic aromatic hydrocarbons such as anthracene, phenanthrene, dihydrophenanthrene, fluorene, anthraquinone, phenanthoquinone and fluorenone; benzoanthracene, benzophenanthrene and benzofluorene. tetracyclic aromatic hydrocarbons; pentacyclic aromatic hydrocarbons such as dibenzoanthracene, dibenzophenanthrene, dibenzofluorene, indenofluorene and benzofluoranthene; hexacyclic aromatic hydrocarbons such as spirobifluorene ; and seven-ring aromatic hydrocarbons such as benzospirobifluorene and acenaphthofluoranthene). mentioned. Aromatic hydrocarbon group is a monocyclic aromatic hydrocarbon or polycyclic aromatic hydrocarbon group in which one or more hydrogen atoms directly bonded to the carbon atoms constituting the ring are removed, and a plurality of groups are bonded. may be The aromatic hydrocarbon group may have a substituent.

An "alkoxy group" may be either linear or branched. The straight-chain alkoxy group usually has 1 to 40 carbon atoms, preferably 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, not including the carbon atoms of the substituents. The number of carbon atoms in the branched alkoxy group is usually 3-40, preferably 3-20, more preferably 4-10, not including the number of carbon atoms in the substituent.
The alkoxy group may have a substituent. Examples of alkoxy groups include methoxy, ethoxy, isopropyloxy, butyloxy, hexyloxy, 2-ethylhexyloxy, 3,7-dimethyloctyloxy, lauryloxy, and hydrogen in these groups. Groups in which some or all of the atoms are substituted with substituents are included.
The number of carbon atoms in the "cycloalkoxy group" is usually 3-40, preferably 3-20, more preferably 4-10, not including the number of carbon atoms in the substituents.
A cycloalkoxy group may have a substituent. Cycloalkoxy groups include, for example, cyclohexyloxy groups and groups in which some or all of the hydrogen atoms in the groups are substituted with substituents.
The number of carbon atoms in the "aryloxy group" is usually 6-60, preferably 6-40, more preferably 6-20, not including the number of carbon atoms in the substituents.
The aryloxy group may have a substituent. Examples of the aryloxy group include phenoxy group, naphthyloxy group, anthracenyloxy group, pyrenyloxy group, and groups in which some or all of the hydrogen atoms in these groups have been substituted with substituents.

A “heterocyclic group” means a group obtained by removing one or more hydrogen atoms directly bonded to atoms (carbon atoms or heteroatoms) constituting a ring from a heterocyclic compound. Among the heterocyclic groups, an "aromatic heterocyclic group", which is a group obtained by removing one or more hydrogen atoms directly bonded to atoms constituting a ring from an aromatic heterocyclic compound, is preferred. A group obtained by removing p hydrogen atoms (p represents an integer of 1 or more) directly bonded to atoms constituting a ring from a heterocyclic compound is also referred to as a "p-valent heterocyclic group". A group obtained by removing p hydrogen atoms directly bonded to atoms constituting a ring from an aromatic heterocyclic compound is also referred to as a "p-valent aromatic heterocyclic group".
Examples of the "aromatic heterocyclic compound" include compounds in which the heterocycle itself exhibits aromaticity, such as azole, thiophene, furan, pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, and carbazole, and phenoxazine. , phenothiazine, benzopyran, and the like, compounds in which an aromatic ring is condensed to a heterocyclic ring, even if the heterocyclic ring itself does not exhibit aromaticity.
The number of carbon atoms in the heterocyclic group is generally 1-60, preferably 2-40, more preferably 3-20, not including the number of carbon atoms in the substituent. The number of heteroatoms in the heterocyclic group, not including the number of heteroatoms in the substituent, is usually 1 to 30, preferably 1 to 10, more preferably 1 to 5, and still more preferably 1 to 3. is.
Heterocyclic groups include, for example, monocyclic heterocyclic compounds such as furan, thiophene, oxadiazole, thiadiazole, pyrrole, diazole, triazole, tetrazole, pyridine, diazabenzene and triazine, or Polycyclic heterocyclic compounds (e.g. azanaphthalene, diazanaphthalene, benzofuran, benzothiophene, indole, azaindole, diazaindole, benzodiazole, benzothiadiazole, benzotriazole, benzothiophene dioxide, benzothiophene oxide and bicyclic heterocyclic compounds such as benzopyranone; dibenzofuran, dibenzothiophene, dibenzothiophene dioxide, dibenzothiophene oxide, dibenzopyranone, dibenzoborol, dibenzosilol, dibenzophosphole, dibenzoselenophene, carbazole, azacarbazole , diazacarbazole, phenoxazine, phenothiazine, 9,10-dihydroacridine, 5,10-dihydrophenazine, acridone, phenazaborine, phenophosphadine, phenoselenazine, phenazacillin, azaanthracene, diazaanthracene, azaphenanthrene and diaza tricyclic heterocyclic compounds such as phenanthrene; tetracyclic heterocyclic compounds such as hexaazatriphenylene, benzocarbazole, azabenzocarbazole, diazabenzocarbazole, benzonaphthofuran and benzonaphthothiophene; dibenzocarbazole, India Pentacyclic heterocyclic compounds such as locarbazole, indenocarbazole, azaindolocarbazole, diazaindolocarbazole, azaindenocarbazole and diazaindenocarbazole; carbazolocarbazole, benzoindolocarbazole and benzoindenocarbazole Hexacyclic heterocyclic compounds such as; and heptacyclic heterocyclic compounds such as dibenzoindolocarbazole and dibenzoindenocarbazole. Groups excluding one or more are included. A heterocyclic group is a group in which a plurality of groups are bonded by removing one or more hydrogen atoms directly bonded to the atoms constituting the ring from a monocyclic heterocyclic compound or a polycyclic heterocyclic compound, good too. The heterocyclic group may have a substituent.

A "halogen atom" means a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.

The "amino group" may have a substituent, preferably a substituted amino group (that is, a secondary amino group or a tertiary amino group, more preferably a tertiary amino group). Preferred substituents on the amino group are alkyl groups, cycloalkyl groups, aryl groups and monovalent heterocyclic groups, and these groups may further have substituents. When the amino group has a plurality of substituents, they may be the same or different, and may be bonded to each other to form a ring together with the nitrogen atom to which each is bonded.
Substituted amino groups include, for example, dialkylamino groups, dicycloalkylamino groups, diarylamino groups, and groups in which some or all of the hydrogen atoms in these groups are further substituted with substituents.
Examples of substituted amino groups include dimethylamino group, diethylamino group, diphenylamino group, bis(methylphenyl)amino group, bis(3,5-di-tert-butylphenyl)amino group, and hydrogen in these groups. Groups in which some or all of the atoms are further substituted with substituents are included.

An "alkenyl group" may be either linear or branched. The straight-chain alkenyl group usually has 2 to 30 carbon atoms, preferably 3 to 20 carbon atoms, more preferably 3 to 10 carbon atoms, not including the carbon atoms of the substituents. The number of carbon atoms in the branched alkenyl group is generally 3-30, preferably 4-20, more preferably 4-10, not including the number of carbon atoms in the substituent.
The number of carbon atoms in the "cycloalkenyl group" is generally 3-30, preferably 4-20, more preferably 5-10, not including the number of carbon atoms in the substituents.
Alkenyl groups and cycloalkenyl groups may have a substituent. Examples of alkenyl groups include vinyl group, 1-propenyl group, 2-butenyl group, 3-butenyl group, 3-pentenyl group, 4-pentenyl group, 1-hexenyl group, 5-hexenyl group, 7-octenyl group, and groups in which some or all of the hydrogen atoms in these groups have been substituted with substituents. The cycloalkenyl group includes, for example, a cyclohexenyl group, a cyclohexadienyl group, a cyclooctatrienyl group, a norbornylenyl group, and groups in which some or all of the hydrogen atoms in these groups are substituted with substituents. .
An "alkynyl group" may be either linear or branched. The number of carbon atoms in the alkynyl group is usually 2-30, preferably 3-10, not including the carbon atoms of the substituents. The number of carbon atoms in the branched alkynyl group is generally 4-30, preferably 4-10, not including the carbon atoms of the substituents.
The number of carbon atoms in the "cycloalkynyl group" is usually 4-30, preferably 4-10, not including the carbon atoms of the substituents.
The alkynyl group and cycloalkynyl group may have a substituent. Examples of alkynyl groups include ethynyl, 1-propynyl, 2-propynyl, 2-butynyl, 3-butynyl, 3-pentynyl, 4-pentynyl, 1-hexynyl, 5-hexynyl, and groups in which some or all of the hydrogen atoms in these groups have been substituted with substituents. Cycloalkynyl groups include, for example, cyclooctynyl groups and groups in which some or all of the hydrogen atoms in the groups are substituted with substituents.

A “crosslinking group” is a group capable of forming a new bond by subjecting it to heating, ultraviolet irradiation, near-ultraviolet irradiation, visible light irradiation, infrared irradiation, radical reaction, or the like. The cross-linking group is preferably at least one cross-linking group selected from Group A of cross-linking groups (that is, at least one group selected from groups represented by formulas (XL-1) to (XL-19)). .

The "substituent" includes, for example, a halogen atom, a cyano group, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, an alkoxy group, a cycloalkoxy group, an aryloxy group, an amino group, a substituted amino group, Alkenyl groups, cycloalkenyl groups, alkynyl groups and cycloalkynyl groups are included. A substituent may be a bridging group. In addition, when multiple substituents are present, they may be the same or different. In addition, when there are multiple substituents, they may bond with each other to form a ring together with the atoms to which they are bonded, but preferably do not form a ring.

The "divalent group" includes, for example, an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, a group represented by -N(R ⁰ )-, represented by -B(R ⁰ )- group represented by -P(R ⁰ )-, group represented by -(O=)P(R ⁰ )-, group represented by -O-, represented by -S- a group represented by -Se-, a group represented by -S(=O)-, a group represented by -S(=O) ₂ - and a group represented by -C(=O)- are mentioned. The divalent group may be a group in which a plurality of these groups are bonded. A divalent group may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. R ⁰ represents a hydrogen atom or a substituent.
R ⁰ includes, for example, a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, a halogen atom and a cyano group. , preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.

In this specification, the absolute value of the difference between the energy level of the lowest triplet excited state and the energy level of the lowest singlet excited state (hereinafter also referred to as “ΔE _ST ”) is calculated by the following method. is required. First, the ground state of the compound is structurally optimized by density functional theory at the B3LYP level. At that time, 6-31G* is used as a basis function. Then, using the obtained structurally optimized structure, _ΔEST of the compound is calculated by B3LYP-level time-dependent density functional theory. However, when 6-31G* contains an atom that cannot be used, LANL2DZ is used for that atom. Gaussian09 is used as a quantum chemical calculation program.

A light-emitting device of the present disclosure is a light-emitting device having an anode, a cathode, and a first layer, a second layer, and a third layer provided between the anode and the cathode.

<First layer>
In the light-emitting device of the present disclosure, the first layer comprises at least one compound selected from the group consisting of the metal complex represented by Formula (1) and the polymer compound (A) (hereinafter referred to as "compound (A) ”) and at least one compound selected from the group consisting of low-molecular-weight compounds (B) and high-molecular-weight compounds (B) (hereinafter also referred to as “compound (B)”). is. That is, the first layer is a layer containing compound (A) and compound (B).
The first layer may contain only one type of compound (A), or may contain two or more types. The first layer may contain only one type of compound (B), or may contain two or more types.

The total content of the compound (B) and the compound (A) in the first layer may be within a range in which the function as the first layer is exhibited. The total content of the compound (B) and the compound (A) in the first layer may be, for example, 0.01 to 100% by mass based on the total amount of the first layer, and the light-emitting device of the present disclosure is preferably 0.1 to 99% by mass, more preferably 0.5 to 90% by mass, still more preferably 1 to 70% by mass, and particularly preferably 5 to 50% by mass. % by mass, particularly preferably 10 to 30% by mass.
The content of the compound (B) in the first layer may be within a range where the function as the first layer is exhibited. The content of the compound (B) in the first layer is, for example, 0.01 to 99 parts by mass when the total content of the compound (B) and the compound (A) is 100 parts by mass. Since the luminous efficiency of the disclosed light-emitting device is more excellent, the amount is preferably 0.05 to 90 parts by mass, more preferably 0.1 to 70 parts by mass, and still more preferably 0.5 to 50 parts by mass. It is particularly preferably 1 to 30 parts by mass, particularly preferably 2 to 20 parts by mass.

In the first layer, compound (A) preferably physically, chemically or electrically interacts with compound (B). This interaction can, for example, enhance or tune the light emitting properties, charge transport properties or charge injection properties of the light emitting device of the present disclosure.
In the light-emitting device of the present disclosure, taking the light-emitting material as an example, the compound (A) and the compound (B) electrically interact to efficiently transfer electric energy from the compound (A) to the compound (B). By passing, the compound (B) can be caused to emit light more efficiently, and the luminous efficiency of the light-emitting device of the present disclosure is more excellent.

From the above viewpoint, in the first layer, the luminous efficiency of the light-emitting device of the present disclosure is more excellent, so the compound (A) has at least It preferably has one function.
From the above point of view, if the light-emitting material is used as an example in the first layer, the compound (B) preferably has light-emitting properties because the light-emitting element of the present disclosure has higher light-emitting efficiency.
From the above point of view, in the first layer, the lowest excited singlet state (S ₁ ) of the compound (A) has superior luminous efficiency of the light-emitting device of the present disclosure, so the lowest excited singlet state of the compound (B) A higher energy level than the state (S ₁ ) is preferred.
From the above point of view, in the first layer, the lowest excited triplet state (T ₁ ) of the compound (A) has superior luminous efficiency of the light-emitting device of the present disclosure, so the lowest excited triplet state of the compound (B) A higher energy level than the state (T ₁ ) is preferred.

The compound (A) preferably exhibits solubility in a solvent capable of dissolving the compound (B), since the light-emitting device of the present disclosure can be produced by a wet method.

[Compound (B)]
Compound (B) is a low-molecular-weight compound (B) or a high-molecular-weight compound (B).

(Low molecular weight compound (B))
The low ^- molecular-weight compound (B) is a condensed heterocyclic skeleton (b ) is a low-molecular-weight compound.
In the low-molecular-weight compound (B), when the condensed heterocyclic skeleton (b) contains a nitrogen atom, at least one of the nitrogen atoms contained in the condensed heterocyclic skeleton (b) is a nitrogen that does not form a double bond. It is preferably an atom, and more preferably all of the nitrogen atoms contained in the condensed heterocyclic skeleton (b) are nitrogen atoms that do not form double bonds.
The low-molecular-weight compound (B) is preferably a low-molecular-weight compound containing no transition metal element (that is, a low-molecular-weight compound composed only of typical elements).

The number of carbon atoms in the condensed heterocyclic skeleton (b) is generally 1 to 60, preferably 5 to 40, more preferably 10 to 25, not including the number of carbon atoms of substituents.
The number of heteroatoms in the condensed heterocyclic skeleton (b) is usually 2 to 30, preferably 2 to 15, more preferably 2 to 10, still more preferably 2 to 10, not including the number of heteroatoms in the substituents. is 2 to 5, particularly preferably 2 or 3.
The number of boron atoms in the condensed heterocyclic skeleton (b) is usually 1 to 10, preferably 1 to 5, more preferably 1 to 3, still more preferably 1 to 3, not including the number of boron atoms in the substituents. is 1.
The total number of oxygen atoms, sulfur atoms, selenium atoms, sp ³ carbon atoms and nitrogen atoms in the condensed heterocyclic skeleton (b) is usually 1 to 20, preferably 1 to 20, not including the number of substituent atoms. 10, more preferably 1 to 5, still more preferably 1 to 3, and particularly preferably 2.

The condensed heterocyclic skeleton (b) contains a boron atom and at least one selected from the group consisting of an oxygen atom, a sulfur atom, and a nitrogen atom in the ring, since the luminous efficiency of the light-emitting device of the present disclosure is superior. more preferably contain a boron atom and a nitrogen atom in the ring, and still more preferably contain a nitrogen atom that does not form a double bond with the boron atom in the ring.

The condensed heterocyclic skeleton (b) is preferably a 3- to 12-ring condensed heterocyclic skeleton, more preferably a 3- to 6-ring condensed heterocyclic skeleton, because the luminous efficiency of the light-emitting device of the present disclosure is superior. and more preferably a pentacyclic condensed heterocyclic skeleton.

The condensed heterocyclic skeleton (b) can also be referred to as a compound having a heterocyclic group (b') containing the condensed heterocyclic skeleton (b).

The heterocyclic group (b') is a polycyclic heterocyclic group containing a boron atom and at least one selected from the group consisting of an oxygen atom, a sulfur atom, a selenium atom, an ^sp3 carbon atom and a nitrogen atom in the ring. It may be a group obtained by removing one or more hydrogen atoms directly bonded to atoms constituting a ring from a cyclic compound, and the group may have a substituent.
In the heterocyclic group (b′), a polycyclic heterocyclic compound is preferably a group consisting of a boron atom, an oxygen atom, a sulfur atom and a nitrogen atom, since the light-emitting device of the present disclosure has superior luminous efficiency. A polycyclic heterocyclic compound containing in the ring at least one selected from More preferred are polycyclic heterocyclic compounds containing a boron atom and a nitrogen atom that does not form a double bond in the ring.
In the heterocyclic group (b′), the polycyclic heterocyclic compound is preferably a 3- to 12-cyclic heterocyclic compound, more preferably a 3- to 12-ring heterocyclic compound, since the luminous efficiency of the light-emitting device of the present disclosure is more excellent. It is a 3- to 6-ring heterocyclic compound, more preferably a pentacyclic heterocyclic compound.

Examples of substituents that the heterocyclic group (b′) may have include halogen atoms, cyano groups, alkyl groups, cycloalkyl groups, alkoxy groups, cycloalkoxy groups, aryloxy groups, aryl groups, monovalent heterocyclic groups. A cyclic group or a substituted amino group is preferable, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a monovalent heterocyclic group or a substituted amino group is more preferable, an alkyl group, a cycloalkyl group, an aryl group, A monovalent heterocyclic group or a substituted amino group is more preferred, and an alkyl group, cycloalkyl group or aryl group is particularly preferred, and these groups may further have a substituent.

The aryl group in the substituent optionally possessed by the heterocyclic group (b′) is preferably a monocyclic or bicyclic to hexacyclic aromatic hydrocarbon to an atom constituting the ring. A group excluding one directly bonded hydrogen atom, more preferably a monocyclic, bicyclic or tricyclic aromatic hydrocarbon in which one hydrogen atom directly bonded to a ring-constituting atom is more preferably benzene, naphthalene, anthracene, phenanthrene or fluorene from which one hydrogen atom directly bonded to a ring-constituting atom has been removed, particularly preferably a phenyl group; The group may have a substituent.
The monovalent heterocyclic group in the substituent that the heterocyclic group (b') may have is preferably a monocyclic or bicyclic to hexacyclic heterocyclic compound, A group in which one hydrogen atom directly bonded to a constituent atom is removed, and one hydrogen atom directly bonded to a ring-constituting atom is removed from a monocyclic, bicyclic or tricyclic heterocyclic compound. more preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, phenoxazine or phenothiazine, excluding one hydrogen atom directly bonded to a ring-constituting atom and particularly preferably a group obtained by removing one hydrogen atom directly bonded to a ring-constituting atom from pyridine, diazabenzene or triazine, and these groups may have a substituent.
In the substituted amino group in the substituent optionally possessed by the heterocyclic group (b′), the substituent possessed by the amino group is preferably an aryl group or a monovalent heterocyclic group, more preferably an aryl group. The group may further have a substituent. Examples and preferred ranges of the aryl group and the monovalent heterocyclic group in the substituents of the amino group are, respectively, the aryl group and the monovalent heterocyclic ring in the substituents that the heterocyclic group (b') may have It is the same as the example and preferred range of the group.

Substituents which the heterocyclic group (b′) may further have include halogen atoms, cyano groups, alkyl groups, cycloalkyl groups, alkoxy groups, cycloalkoxy groups, aryl An oxy group, an aryl group, a monovalent heterocyclic group or a substituted amino group is preferred, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group is more preferred, an alkyl group, a cycloalkyl group or An aryl group is more preferred, and an alkyl group or a cycloalkyl group is particularly preferred. These groups may further have a substituent, but preferably have no further substituent.
Examples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group in the substituent that the heterocyclic group (b′) may further have are The same as the examples and preferred ranges of the aryl group, monovalent heterocyclic group and substituted amino group in the substituents that the ring group (b') may have.

A "nitrogen atom that does not form a double bond" means a nitrogen atom that is bonded to three other atoms via single bonds.
"Containing a nitrogen atom that does not form a double bond in the ring" means -N(-R ^N )- (wherein R ^N represents a hydrogen atom or a substituent) or the formula:

で表される基を含むことを意味する。

is meant to contain a group represented by

The low-molecular-weight compound (B) is preferably a thermally activated delayed fluorescence (TADF) compound because the light-emitting device of the present disclosure has superior luminous efficiency.
Here, the heat-activated delayed fluorescence compound is a compound having heat-activated delayed fluorescence.

_ΔEST of the low-molecular-weight compound (B) may be 2.0 eV or less, 1.5 eV or less, 1.0 eV or less, or 0.80 eV or less. However, it is preferably 0.60 eV or less, more preferably 0.55 eV or less, and even more preferably 0.50 eV or less, because the luminous efficiency of the light-emitting device of the present disclosure is more excellent. _ΔEST of the low-molecular-weight compound (B) may be 0.001 eV or more, 0.01 eV or more, 0.10 eV or more, or 0.20 eV or more. may be 0.30 eV or more, or 0.40 eV or more.

The molecular weight of the low molecular weight compound (B) is preferably 1×10 ² to 5×10 ³ , more preferably 2×10 ² to 3×10 ³ , still more preferably 3×10 ² to 1.5. ×10 ³ , particularly preferably 4×10 ² to 1×10 ³ .

The low-molecular-weight compound (B) is preferably a compound represented by formula (1-1), formula (1-2) or formula (1-3), since the light-emitting device of the present disclosure has superior luminous efficiency. A compound represented by formula (1-2) or formula (1-3) is preferred, and a compound represented by formula (1-2) is even more preferred.

Ar ¹ , Ar ² and Ar ³ are preferably monocyclic or bicyclic to hexacyclic aromatic hydrocarbons, or monocyclic or bicyclic A group obtained by removing one or more hydrogen atoms directly bonded to the atoms constituting the ring from a cyclic to hexacyclic heterocyclic compound, more preferably a monocyclic, bicyclic or tricyclic A group obtained by removing one or more hydrogen atoms directly bonded to atoms constituting a ring from an aromatic hydrocarbon or a monocyclic, bicyclic or tricyclic heterocyclic compound, more preferably A group obtained by removing one or more hydrogen atoms directly bonded to atoms constituting a ring from a monocyclic aromatic hydrocarbon or a monocyclic heterocyclic compound, particularly preferably from benzene, pyridine or diazabenzene , a group obtained by removing one or more hydrogen atoms directly bonded to a ring-constituting atom, particularly preferably a group obtained by removing one or more hydrogen atoms directly bonded to a ring-constituting atom from benzene, These groups may have a substituent.
Examples and preferred ranges of substituents that Ar ¹ , Ar ² and Ar ³ may have are the same as examples and preferred ranges of substituents that the heterocyclic group (b′) may have.

Y ¹ is preferably an oxygen atom, a sulfur atom, a group represented by -N(Ry)- or an alkylene group, more preferably an oxygen atom, It is a sulfur atom or a group represented by -N(Ry)-, more preferably a group represented by -N(Ry)-, and these groups may have a substituent.

Y ² and Y ³ are preferably a single bond, an oxygen atom, a sulfur atom, a selenium atom, a group represented by -N(Ry)-, -B( A group represented by Ry)-, an alkylene group or a cycloalkylene group, more preferably a single bond, an oxygen atom, a sulfur atom, a group represented by -N(Ry)-, or -B(Ry)- or an alkylene group, more preferably an oxygen atom, a sulfur atom, a group represented by -N(Ry)- or an alkylene group, particularly preferably an oxygen atom, a sulfur atom or -N ( A group represented by Ry)-, particularly preferably a group represented by -N(Ry)-, and these groups may have a substituent.

The arylene group for Y ² and Y ³ is preferably a group obtained by removing two hydrogen atoms directly bonded to the carbon atoms constituting the ring from a monocyclic or bicyclic to hexacyclic aromatic hydrocarbon. and more preferably a group obtained by removing two hydrogen atoms directly bonded to the carbon atoms constituting the ring from a monocyclic, bicyclic or tricyclic aromatic hydrocarbon, more preferably benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene or fluorene from which two hydrogen atoms directly bonded to carbon atoms constituting a ring are removed; particularly preferably, benzene, naphthalene or fluorene constitutes a ring; It is a group excluding two hydrogen atoms directly bonded to a carbon atom, particularly preferably a phenylene group, and these groups may have a substituent.
The divalent heterocyclic group for Y ² and Y ³ is preferably a monocyclic or bicyclic to hexacyclic heterocyclic compound directly bonded to a ring-constituting atom (preferably a carbon atom). A group excluding two hydrogen atoms, more preferably a monocyclic, bicyclic or tricyclic heterocyclic compound, a hydrogen directly bonded to an atom (preferably a carbon atom) constituting a ring A group with two atoms removed, more preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, carbazole, azacarbazole, diazacarbazole, phenoxazine, phenothiazine, 9,10- A group obtained by removing two hydrogen atoms directly bonded to ring-constituting atoms (preferably carbon atoms) from dihydroacridine or 5,10-dihydrophenazine, particularly preferably pyridine, diazabenzene, triazine, carbazole, phenoxy a group obtained by removing two hydrogen atoms directly bonded to ring-constituting atoms (preferably carbon atoms) from sazine, phenothiazine, 9,10-dihydroacridine or 5,10-dihydrophenazine, particularly preferably pyridine , diazabenzene or triazine by removing two hydrogen atoms directly bonded to atoms (preferably carbon atoms) constituting the ring, and these groups may have a substituent.
The alkylene group for Y ¹ , Y ² and Y ³ is preferably a methylene group, an ethylene group or a propylene group, more preferably a methylene group, and these groups may have a substituent.

Y ¹ , Y ² and Y ³ are all preferably an oxygen atom, a sulfur atom or a group represented by —N(Ry)—, since the light emitting device of the present disclosure has better luminous efficiency, and Y ¹ , Y ² and Y
More preferably, all of ³ are groups represented by -N(Ry)-.

Examples and preferred ranges of substituents that Y ¹ , Y ² and Y ³ may have are the same as examples and preferred ranges of substituents that the heterocyclic group (b′) may have.

Ry is preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group or a monovalent heterocyclic group, still more preferably an aryl group; A group may have a substituent.
Examples and preferred ranges of the aryl group and monovalent heterocyclic group in Ry are respectively examples and preferred examples of the aryl group and monovalent heterocyclic group in the substituent that the heterocyclic group (b′) may have Same as range.
Examples and preferred ranges of substituents that Ry may have are the same as examples and preferred ranges of substituents that the heterocyclic group (b') may have.

Y ¹ and Ar ¹ may be directly bonded or bonded via a divalent group to form a ring. preferably not.
When Y ¹ and Ar ¹ are bonded through a divalent group to form a ring, the divalent group is preferably an alkylene group, a cycloalkylene group, an arylene group, a divalent hetero a cyclic group, a group represented by -N(R ⁰ )-, a group represented by -B(R ⁰ )-, a group represented by -O-, a group represented by -S- or -Se- and more preferably an alkylene group, a cycloalkylene group, a group represented by -N(R ⁰ )-, a group represented by -B(R ⁰ )-, and a group represented by -O- a group represented by -S- or a group represented by -Se-, more preferably an alkylene group, a group represented by -N(R ⁰ )-, a group represented by -O- or a group represented by -S-, particularly preferably a group represented by -O-, a group represented by -S- or a group represented by -N(R ⁰ )- , particularly preferably a group represented by -N(R ⁰ )-, and these groups may have a substituent.
When Y ¹ and Ar ¹ are bonded via a divalent group to form a ring, examples and preferred ranges of the arylene group, divalent heterocyclic group and alkylene group in the divalent group are They are the same as the examples and preferred ranges of the arylene group, divalent heterocyclic group and alkylene group for ^Y2 and ^Y3 , respectively.
When Y ¹ and Ar ¹ are bonded via a divalent group to form a ring, examples and preferred ranges of substituents that the divalent group may have include Y ² and Y It is the same as the examples and preferred range of the substituent that ³ may have.
When Y ¹ and Ar ¹ are bonded through a divalent group to form a ring, examples and preferred ranges of R ⁰ in the divalent group are the same as examples and preferred ranges of Ry .

Y ¹ and Ar ² may be directly bonded or bonded via a divalent group to form a ring. preferably not. Examples and preferred ranges of the divalent group when Y ¹ and Ar ² are bonded via a divalent group to form a ring are Y ¹ and Ar ¹ via a divalent group are the same as the examples and preferred ranges of the divalent group in the case of forming a ring by combining with each other.
Y ² and Ar ¹ may be directly bonded or bonded via a divalent group to form a ring. preferably not. Examples and preferred ranges of the divalent group when Y ² and Ar ¹ are bonded via a divalent group to form a ring are Y ¹ and Ar ¹ via a divalent group are the same as the examples and preferred ranges of the divalent group in the case of forming a ring by combining with each other.
Y ² and Ar ³ may be directly bonded or bonded via a divalent group to form a ring. preferably not. Examples and preferred ranges of the divalent group when Y ² and Ar ³ are bonded via a divalent group to form a ring are Y ¹ and Ar ¹ via a divalent group are the same as the examples and preferred ranges of the divalent group in the case of forming a ring by combining with each other.
Y ³ and Ar ² may be directly bonded or bonded via a divalent group to form a ring. preferably not. Examples and preferred ranges of the divalent group when Y ³ and Ar ² are bonded via a divalent group to form a ring are Y ¹ and Ar ¹ via a divalent group are the same as the examples and preferred ranges of the divalent group in the case of forming a ring by combining with each other.
Y ³ and Ar ³ may be directly bonded or bonded via a divalent group to form a ring. preferably not. Examples and preferred ranges of the divalent group when Y ³ and Ar ³ are bonded via a divalent group to form a ring are Y ¹ and Ar ¹ via a divalent group are the same as the examples and preferred ranges of the divalent group in the case of forming a ring by combining with each other.

Examples of the low-molecular-weight compound (B) include compounds represented by the following formula and compound B1 described later. In the formula, Z ¹ represents an oxygen atom or a sulfur atom. When multiple Z ¹ are present, they may be the same or different.

The maximum peak wavelength of the emission spectrum of the low-molecular-weight compound (B) at 25° C. is preferably 380 nm or longer, more preferably 400 nm or longer, even more preferably 420 nm or longer, and particularly preferably 440 nm or longer. The maximum peak wavelength of the emission spectrum of the low-molecular-weight compound (B) at 25° C. is preferably 750 nm or less, more preferably 620 nm or less, even more preferably 570 nm or less, particularly preferably 495 nm or less. It is preferably 480 nm or less.
The half width of the maximum peak of the emission spectrum of the low-molecular-weight compound (B) at 25° C. is preferably 50 nm or less, more preferably 40 nm or less, even more preferably 30 nm or less, and particularly preferably 25 nm or less. .
The maximum peak wavelength of the emission spectrum of the compound at room temperature can be determined by dissolving the compound in an organic solvent such as xylene, toluene, chloroform, tetrahydrofuran, etc., and preparing a dilute solution (1×10 ⁻⁶ mass % to 1×10 ⁻³ mass %). %), which can be evaluated by measuring the PL spectrum of the dilute solution at room temperature. Xylene is preferred as the organic solvent for dissolving the compound.

(Polymer compound (B))
The polymer compound (B) is a polymer compound containing a structural unit (hereinafter also referred to as “structural unit (B)”) having a group obtained by removing one or more hydrogen atoms from the low molecular weight compound (B).
The structural unit (B) is preferably a structural unit having a group obtained by removing 1 or more and 5 or less hydrogen atoms from the low-molecular-weight compound (B), and more preferably, because the synthesis of the polymer compound (B) is easy. is a structural unit having a group in which 1 to 3 hydrogen atoms are removed from the low-molecular-weight compound (B), more preferably a group in which 1 or 2 hydrogen atoms are removed from the low-molecular-weight compound (B) is a structural unit having
The structural unit (B) is preferably represented by the formula (BP-1) or the formula (BP-2 ) or a structural unit represented by formula (BP-3), more preferably a structural unit represented by formula (BP-1) or formula (BP-2).

[In the formula,
^MBP1 represents a group obtained by removing one hydrogen atom from the low-molecular-weight compound (B).
^MBP2 represents a group obtained by removing two hydrogen atoms from the low-molecular-weight compound (B).
^MBP3 represents a group obtained by removing three hydrogen atoms from the low-molecular-weight compound (B).
L ^BP1 each independently represents an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, a group represented by -N(R ^BP1 )-, an oxygen atom or a sulfur atom, and these groups are It may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. ^RBP1 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple ^LBP1 are present, they may be the same or different.
^nBP1 represents an integer of 0 or more and 10 or less.
Ar ^BP1 represents a hydrocarbon group or a heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. ]

L ^BP1 is preferably an alkylene group, a cycloalkylene group, an arylene group or a divalent heterocyclic group, more preferably an alkylene group or an arylene group, still more preferably an arylene group, these groups may have a substituent.
Examples and preferred ranges of the arylene group and divalent heterocyclic group in ^LBP1 are the same as those of the arylene group and divalent heterocyclic group in Ar ^Y1 described below.
The alkylene group in ^LBP1 is preferably a methylene group, an ethylene group or a propylene group, more preferably a methylene group, and these groups may have a substituent.
Examples and preferred ranges of R ^BP1 are the same as examples and preferred ranges of R ^X1 to R ^X3 described later.

^nBP1 is preferably an integer of 0 to 5, preferably an integer of 0 to 3, more preferably 0 or 1, still more preferably 0.

The hydrocarbon group for Ar ^BP1 includes an optionally substituted aromatic hydrocarbon group and an optionally substituted aliphatic hydrocarbon group. The hydrocarbon group in Ar ^BP1 includes groups in which multiple of these groups are bonded.
In Ar ^BP1 , the aliphatic hydrocarbon group includes a group obtained by removing one hydrogen atom nBP from an alkylene group or a cycloalkylene group, preferably a group obtained by removing ^one hydrogen atom ^nBP from an alkylene group, These groups may have a substituent. Examples and preferred range of this alkylene group include the examples and preferred range of the alkylene group in L ^H1 described later.
In Ar ^BP1 , the aromatic hydrocarbon group includes a group obtained by removing one hydrogen atom n ^BP from an arylene group, and this group may have a substituent. Examples and preferred ranges of the arylene group include the examples and preferred ranges of the arylene group in Ar ^Y1 described later.
The heterocyclic group for Ar ^BP1 includes a group obtained by removing one hydrogen atom n ^BP from a divalent heterocyclic group, and this group may have a substituent. Examples and preferred ranges of the divalent heterocyclic group include the examples and preferred ranges of the divalent heterocyclic group in Ar ^Y1 described later.
Examples and preferred examples of substituents that L ^BP1 and Ar ^{2 BP1} may have are the same as examples and preferred ranges of substituents that the group represented by Ar ^Y1 may have, which will be described later.

Examples of the structural unit (B) include structural units represented by the following formula.

[In the formula,
^RTS is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, and these groups may further have a substituent. Multiple ^RTSs may be the same or different. ]

Examples and preferred ranges of the aryl ^group , monovalent heterocyclic group and substituted amino group in R ^TS are, respectively, the aryl group, monovalent heterocyclic It is the same as the examples and preferred ranges of the cyclic group and the substituted amino group.
Examples and preferred ranges of substituents that R ^TS may have include examples and preferred ranges of substituents that the group represented by Ar ^Y1 described later may further have. are the same.

The content of the structural unit (B) contained in the polymer compound (B) may be within a range where the function of the polymer compound (B) is exhibited. The content of the structural unit (B) contained in the polymer compound (B) is, for example, 0.01 to 100 mol% with respect to the total content of the structural units contained in the polymer compound (B). , preferably 0.05 to 90 mol%, more preferably 0.1 to 70 mol%, still more preferably 0.2 to 50 mol%, because the luminous efficiency of the light emitting device of the present disclosure is more excellent. 0.5 to 30 mol %, particularly preferably 1 to 10 mol %. Only one type of structural unit (B) may be contained in the polymer compound (B), or two or more types thereof may be contained.

Since the polymer compound (B) has superior luminous efficiency of the light-emitting device of the present disclosure, it is It is preferable to further include at least one selected structural unit. That is, the polymer compound (B) includes at least one structural unit selected from the group consisting of structural units represented by the formula (X) described later and structural units represented by the formula (Y) described later; It is preferably a polymer compound containing the unit (B).
The polymer compound (B) comprises at least one structural unit selected from the group consisting of structural units represented by the formula (X) described later and structural units represented by the formula (Y) described later, and a structural unit ( B), the structural unit (B) is preferably different from the structural unit represented by the formula (X) described later and the structural unit represented by the formula (Y) described later.
The polymer compound (B) preferably further contains a structural unit represented by the below-described formula (Y), since the light-emitting device of the present disclosure has better luminous efficiency.
Since the polymer compound (B) has excellent hole-transport properties and the luminous efficiency of the light-emitting device of the present disclosure is superior, the structural unit represented by the formula (X) described below is used as the polymer compound (B). It is preferable to further include.
The polymer compound (B) has an excellent hole-transport property of the polymer compound (B), and the luminous efficiency of the light-emitting device of the present disclosure is further excellent. It is preferable to further include a structural unit represented by formula (Y) described below.

When the polymer compound (B) contains a structural unit represented by the below-described formula (X), the content of the structural unit represented by the below-described formula (X) is such that the polymer compound (B) functions as Any range is acceptable. When the polymer compound (B) contains a structural unit represented by the below-described formula (X), the content of the structural unit represented by the below-described formula (X) is the constitution contained in the polymer compound (B). For example, it is 0.01 to 99.9 mol% with respect to the total content of the units, the hole transport property of the polymer compound (B) is excellent, and the luminous efficiency of the light emitting device of the present disclosure is higher. Since it is excellent, it is preferably 0.05 to 90 mol%, more preferably 0.1 to 70 mol%, still more preferably 0.2 to 50 mol%, particularly preferably 0.5 to 30 mol%. %, particularly preferably 1 to 10 mol %.
The structural unit represented by formula (X) may be contained in the polymer compound (B) singly or in combination of two or more.

When the polymer compound (B) contains the structural unit represented by the formula (Y), the content of the structural unit represented by the formula (Y) is within the range in which the polymer compound (B) functions. If it is When the polymer compound (B) contains the structural unit represented by the formula (Y), the content of the structural unit represented by the formula (Y) is the total of the structural units contained in the polymer compound (B). With respect to the content, it is, for example, 1 to 99.99 mol %, and since the luminous efficiency of the light-emitting device of the present disclosure is more excellent, it is preferably 10 to 99.95 mol %, more preferably 30 to 99.9 mol %. It is 9 mol %, more preferably 50 to 99.8 mol %, particularly preferably 70 to 99.5 mol %, particularly preferably 90 to 99 mol %.
The structural unit represented by formula (Y) may be contained in the polymer compound (B) singly or in combination of two or more.

When the polymer compound (B) contains the structural unit represented by the formula (X) and/or the structural unit represented by the formula (Y), and the structural unit (B), it is represented by the formula (X) The total content of the structural unit represented by the formula (Y) and the structural unit (B) may be within a range in which the function of the polymer compound (B) can be exhibited. When the polymer compound (B) contains the structural unit represented by the formula (X) and/or the structural unit represented by the formula (Y), and the structural unit (B), it is represented by the formula (X) The total content of the structural unit represented by the formula (Y) and the structural unit (B) is, for example, 1 It is preferably 10 to 100 mol%, more preferably 30, because the hole transport property of the polymer compound (B) is excellent and the luminous efficiency of the light emitting device of the present disclosure is more excellent. 100 mol %, more preferably 50 to 100 mol %, particularly preferably 70 to 100 mol %, particularly preferably 90 to 100 mol %.

Examples of the polymer compound (B) include polymer compounds BP-1 to BP-4. Here, "other" means a structural unit other than the structural unit (B), the structural unit represented by formula (X), and the structural unit represented by formula (Y).

[In the table, p ^b , q ^b , r ^b and s ^b represent the molar ratio (mol %) of each structural unit. p ^b +q ^b +r ^b +s ^b =100 and 70≦p ^b +q ^b +r ^b ≦100. ]

The polymer compound (B) may be any of a block copolymer, a random copolymer, an alternating copolymer, a graft copolymer, or other modes. It is preferably a copolymer obtained by copolymerizing monomers.

The example and preferred range of the polystyrene-equivalent number average molecular weight of the polymer compound (B) are the same as the example and preferred range of the polystyrene-equivalent number average molecular weight of the first polymer compound described below. The example and preferred range of the polystyrene-equivalent weight average molecular weight of the polymer compound (B) are the same as the example and preferred range of the polystyrene-equivalent weight average molecular weight of the first polymer compound described below.

(Method for producing polymer compound (B))
The polymer compound (B) can be produced by a method similar to the method for producing the first polymer compound described below.

[Compound (A)]
The compound (A) is at least one selected from the group consisting of the metal complex represented by Formula (1) and the polymer compound (A).

(Metal complex represented by formula (1))
The metal complex represented by Formula (1) is preferably a low-molecular-weight compound.
The molecular weight of the metal complex represented by formula (1) is preferably 3×10 ² to 1×10 ⁴ , more preferably 4×10 ² to 7×10 ³ , still more preferably 5×10 2 to 7×10 3 . 10 ² to 5×10 ³ , particularly preferably 6×10 ² to 3×10 ³ , particularly preferably 7×10 ² to 2×10 ³ .

M is preferably an iridium atom or a platinum atom, more preferably an iridium atom, since the light-emitting device of the present disclosure has better luminous efficiency.
When M is a rhodium atom or an iridium atom, ⁿ¹ is preferably 2 or 3, more preferably 3.
ⁿ¹ is preferably 2 when M is a palladium atom or a platinum atom.

At least one of E ¹ and E ² is preferably a carbon atom, more preferably E ¹ and E ² are carbon atoms.
E ¹ and E ² are preferably the same because the metal complex represented by formula (1) can be easily synthesized. In addition, since the metal complex represented by formula (1) can be easily synthesized, when there are a plurality of E ¹ 's, it is preferable that at least two of the plurality of E ^{1 's} are the same. are all the same. In ^addition , since the metal complex represented by formula (1) can be easily synthesized, when there are a plurality of E ² , it is preferable that at least two of the plurality of E ² are the same. are all the same.

The number of carbon atoms in the aromatic heterocyclic ring in ring L ¹ is preferably 1 to 30, more preferably 1 to 20, still more preferably 1 to 10, not including the number of carbon atoms in substituents. , particularly preferably 1 to 5, particularly preferably 1 to 3.
The number of heteroatoms in the aromatic heterocyclic ring in ring L ¹ is preferably 1 to 30, more preferably 1 to 10, still more preferably 1 to 5, not including the number of heteroatoms in the substituents. , particularly preferably 1 to 3.
Examples of the ring L ¹ include aromatic heterocycles containing one or more nitrogen atoms in the ring among the aromatic heterocycles exemplified in the section of the heterocyclic group described above, and the aromatic heterocycle may have a substituent. Among these, the ring L ¹ is preferably an aromatic heterocyclic ring containing a 5-membered ring or an aromatic heterocyclic ring containing a 6-membered ring, more preferably An aromatic heterocyclic ring containing a 5-membered ring containing 2 or more and 4 or less nitrogen atoms in the ring, or an aromatic heterocyclic ring containing a 6-membered ring containing 1 or more and 4 or less nitrogen atoms in the ring more preferably an aromatic heterocyclic ring containing a 5-membered ring containing 2 or 3 nitrogen atoms in the ring, or an aromatic heterocyclic ring containing a 6-membered ring containing 1 or 2 nitrogen atoms in the ring It is a ring, particularly preferably an aromatic heterocyclic ring containing a 5-membered ring containing two or three nitrogen atoms in the ring, and these rings may have a substituent. However, when ring L ¹ is a 6-membered aromatic heterocycle, E ¹ is preferably a carbon atom.
Ring L ¹ is preferably a monocyclic, bicyclic or tricyclic aromatic heterocyclic ring, more preferably a pyridine ring, diazabenzene ring, azanaphthalene ring, diazanaphthalene ring, diazole ring or triazole ring, more preferably pyridine ring, azanaphthalene ring, diazole ring or triazole ring, particularly preferably diazole ring or triazole ring, particularly preferably is a triazole ring, and these rings may have a substituent.
Since the metal complex represented by formula (1) can be easily synthesized, when a plurality of ring L ¹ are present, it is preferable that at least two of the plurality of ring L ¹ are the same. ¹ are more preferably the same.

The number of carbon atoms in the aromatic hydrocarbon ring in ring L ² is preferably 6 to 60, more preferably 6 to 40, still more preferably 6 to 20, not including the number of carbon atoms in substituents. be.
Examples of the aromatic hydrocarbon ring in the ring L ² include the aromatic hydrocarbon rings exemplified in the section of the aromatic hydrocarbon group above, preferably an aromatic hydrocarbon ring containing a 5- or 6-membered ring. It is a hydrogen ring, and these aromatic hydrocarbon rings may have a substituent. Among these, the aromatic hydrocarbon ring in the ring L ² is preferably a monocyclic or bicyclic ring such as those exemplified in the section of the aromatic hydrocarbon group above, since the light emitting element of the present disclosure has superior luminous efficiency. or a tricyclic aromatic hydrocarbon ring (preferably an aromatic hydrocarbon ring containing a 5- or 6-membered ring), more preferably a benzene ring, a naphthalene ring, a fluorene ring, a phenanthrene ring or a dihydrophenanthrene ring , more preferably a benzene ring or a fluorene ring, particularly preferably a benzene ring, and these rings may have a substituent.
The number of carbon atoms in the aromatic heterocyclic ring in ring L ² is preferably 1 to 60, more preferably 2 to 40, still more preferably 3 to 20, not including the number of carbon atoms in substituents. . The number of heteroatoms in the aromatic heterocycle in ring L ² does not include the number of heteroatoms in the substituents,
It is preferably 1-10, more preferably 1-5, still more preferably 1-3.
Examples of the aromatic heterocyclic ring in ring L ² include the aromatic heterocyclic rings exemplified in the section of the heterocyclic group described above, preferably an aromatic heterocyclic ring containing a 5- or 6-membered ring, These aromatic heterocycles may have a substituent. Among these, the aromatic heterocyclic ring in the ring L ² is preferably a monocyclic, bicyclic or tricyclic (preferably an aromatic heterocycle containing a 5- or 6-membered ring) of the formula, more preferably pyridine ring, diazabenzene ring, azanaphthalene ring, diazanaphthalene ring, indole ring, benzofuran ring, benzothiophene ring, carbazole ring, azacarbazole ring, diazacarbazole ring, dibenzofuran ring or dibenzothiophene ring, more preferably pyridine ring, diazabenzene ring, carbazole ring, dibenzofuran ring or dibenzothiophene ring, particularly A pyridine ring or a diazabenzene ring is preferable, and these rings may have a substituent.
Ring L ² is preferably a monocyclic, bicyclic or tricyclic aromatic hydrocarbon ring (preferably a 5-membered ring or 6-membered ring) because the luminous efficiency of the light-emitting device of the present disclosure is further excellent. aromatic hydrocarbon ring containing), or a monocyclic, bicyclic or tricyclic aromatic heterocycle (preferably an aromatic heterocycle containing a 5- or 6-membered ring), more preferably , a benzene ring, a fluorene ring, a pyridine ring, a diazabenzene ring, a carbazole ring, a dibenzofuran ring or a dibenzothiophene ring, more preferably a benzene ring, a pyridine ring or a diazabenzene ring, particularly preferably a benzene ring. ring may have a substituent.
Since the metal complex represented by formula (1) can be easily synthesized, when there are a plurality of ring L ² , it is preferable that at least two of the plurality of ring L ² are the same. ² are more preferably the same.

Since the luminous efficiency of the light-emitting device of the present disclosure is further excellent, the ring L ¹ is an aromatic heterocyclic ring containing a 5-membered ring (preferably a monocyclic, bicyclic or tricyclic aromatic heterocyclic ring) or 6 an aromatic heterocycle containing a membered ring (preferably a monocyclic, bicyclic or tricyclic aromatic heterocycle), and ring L ² is an aromatic containing a 5- or 6-membered ring A hydrocarbon ring (preferably monocyclic, bicyclic or tricyclic aromatic hydrocarbon ring) or an aromatic heterocyclic ring containing a 5- or 6-membered ring (preferably monocyclic, 2 cyclic or tricyclic aromatic heterocycle), ring L ¹ is pyridine ring, diazabenzene ring, azanaphthalene ring, diazanaphthalene ring, diazole ring or triazole ring, and ring L ² is more preferably a benzene ring, fluorene ring, pyridine ring, diazabenzene ring, carbazole ring, dibenzofuran ring or dibenzothiophene ring, and ring L ¹ is a pyridine ring, diazabenzene ring, azanaphthalene ring, diazanaphthalene ring or diazole ring or a triazole ring, and ring L ² is more preferably a benzene ring, a pyridine ring, or a diazabenzene ring, ring L ¹ is a pyridine ring, an azanaphthalene ring, a diazole ring, or a triazole ring, and ring L ² is particularly preferably a benzene ring, particularly preferably ring L ¹ is a diazole ring or triazole ring, and ring L ² is a benzene ring, ring L ¹ is a triazole ring, and ring ^L2 is particularly preferably a benzene ring, and these rings may have a substituent.

The substituent (hereinafter also referred to as "primary substituent") that the ring L ¹ and ring L ² may have is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, or an aryl group. , an aryloxy group, a monovalent heterocyclic group, a substituted amino group or a fluorine atom, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, still more preferably is an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, particularly preferably an alkyl group, a cycloalkyl group or an aryl group, and these groups are further substituted (hereinafter referred to as "secondary substitution Also referred to as "group").

At least one of ring L ¹ and ring L ² preferably has a primary substituent because the luminous efficiency of the light-emitting device of the present disclosure is more excellent.
In the metal complex represented by formula (1), when at least one of ring L ¹ and ring L ² has a primary substituent and there are a plurality of ring L ¹ and ring L 2, a plurality of ring L 1 and ring L ² are present At least one ring out of the ring L ¹ and the ring L ² should have a primary substituent, but since the luminous efficiency of the light-emitting device of the present disclosure is superior, multiple rings L ¹ and L ² are present At least two of them preferably have a primary substituent, and more preferably at least three of the plurality of ring L ¹ and ring L ² have a primary substituent. Further, in the metal complex represented by formula (1), when at least one of ring L ¹ and ring L ² has a primary substituent, and a plurality of ring L ¹ and ring L ² are present, the present At least two of the plurality of rings L ¹ have a primary substituent, or at least two of the plurality of rings L ² have a primary substituent, so that the disclosed light-emitting device has better luminous efficiency. Preferably, all of the multiple rings L ¹ have a primary substituent, or more preferably all of the multiple rings L ² have a primary substituent, and all of the multiple rings L ¹ have It is more preferred to have a primary substituent.
In the metal complex represented by formula (1), when at least one of ring L ¹ and ring L ² has a primary substituent, at least one of ring L ¹ and ring L ² has a primary substituent The number is usually 1 to 10, and preferably 1 to 5 because the metal complex represented by formula (1) can be easily synthesized and the luminous efficiency of the light emitting device of the present disclosure is superior. , more preferably 1 to 3, still more preferably 1 or 2.
In the metal complex represented by formula (1), when at least one of ring L ¹ and ring L ² has a primary substituent and M is a rhodium atom or an iridium atom, ring L ¹ and ring The total number of primary substituents that L ² has is usually 1 to 30, the metal complex represented by formula (1) can be easily synthesized, and the luminous efficiency of the light-emitting device of the present disclosure is The number is preferably 1 to 18, more preferably 2 to 12, even more preferably 3 to 6, because it is more excellent.
In the metal complex represented by formula (1), when at least one of ring L ¹ and ring L ² has a primary substituent and M is a palladium atom or a platinum atom, ring L ¹ and ring The total number of primary substituents that L ² has is usually 1 to 20, the metal complex represented by formula (1) can be easily synthesized, and the luminous efficiency of the light-emitting device of this embodiment can be improved. is more excellent, the number is preferably 1 to 12, more preferably 1 to 8, even more preferably 2 to 4.

The aryl group in the primary substituent is preferably a monocyclic, bicyclic or tricyclic aromatic hydrocarbon group excluding one hydrogen atom directly bonded to a carbon atom constituting the ring, A phenyl group, a naphthyl group or a fluorenyl group is more preferred, and a phenyl group is even more preferred, and these groups may have a substituent.
As the monovalent heterocyclic group in the primary substituent, preferably, one hydrogen atom directly bonded to a carbon atom or heteroatom constituting a ring from a monocyclic, bicyclic or tricyclic heterocyclic compound and more preferably a pyridine ring, diazabenzene ring, triazine ring, azanaphthalene ring, diazanaphthalene ring, carbazole ring, dibenzofuran ring or dibenzothiophene ring directly to a carbon atom or heteroatom constituting the ring. A group in which one hydrogen atom is removed, more preferably a group in which one hydrogen atom directly bonded to a ring-constituting carbon atom is removed from a pyridine ring, a diazabenzene ring or a triazine ring, and these groups may have a substituent.
In the substituted amino group in the primary substituent, the substituent possessed by the amino group is preferably an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and these groups may further have a substituent. . Examples and preferred ranges of the aryl group and monovalent heterocyclic group in the substituent of the amino group are the same as those of the aryl group and monovalent heterocyclic group in the primary substituent.

Examples and preferred ranges of the secondary substituents (substituents that the primary substituent may further have) are the same as the examples and preferred ranges of the primary substituents.
The secondary substituent may further have a substituent (hereinafter also referred to as "tertiary substituent"). Examples and preferred ranges of tertiary substituents (substituents that secondary substituents may further have) are the same as examples and preferred ranges of primary substituents.
The tertiary substituent may further have a substituent (hereinafter also referred to as "quaternary substituent"). The quaternary substituent (substituent that the tertiary substituent may further have) is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent a cyclic group, a substituted amino group or a fluorine atom, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, still more preferably an alkyl group, a cycloalkyl group or An aryl group, particularly preferably an alkyl group or a cycloalkyl group, which may further have a substituent, because the metal complex represented by the formula (1) can be easily synthesized. , and preferably have no substituents.
Examples and preferred ranges of the aryl group, monovalent heterocyclic group and substituted amino group in the secondary substituent, tertiary substituent and quaternary substituent are, respectively, the aryl group in the primary substituent, the monovalent heterocyclic group and It is the same as the example and preferred range of the substituted amino group.

(anionic bidentate ligand)
Examples of the anionic bidentate ligand represented by A ¹ -G ¹ -A ² include ligands represented by the following formulae. However, the anionic bidentate ligand represented by A ¹ -G ¹ -A ² is different from the ligand whose number is defined by the subscript n ¹ .

［式中、＊は、Ｍと結合する部位を表す。］

[In the formula, * represents a site that binds to M. ]

Examples of the metal complex represented by Formula (1) include the metal complexes shown below.

(Polymer compound (A))
The polymer compound (A) is a polymer containing a structural unit (hereinafter also referred to as "structural unit (A)") having a group obtained by removing one or more hydrogen atoms from the metal complex represented by formula (1). is a compound.
Structural unit (A) is preferably a structural unit having a group obtained by removing 1 or more and 5 or less hydrogen atoms from the metal complex represented by formula (1), since synthesis of polymer compound (A) is easy. more preferably a structural unit having a group obtained by removing 1 or more and 3 or less hydrogen atoms from the metal complex represented by formula (1), and still more preferably a metal complex represented by formula (1) It is a structural unit having a group obtained by removing one or two hydrogen atoms from
The structural unit (A) is preferably represented by the formula (AP-1) or the formula (AP-2 ) or a structural unit represented by formula (AP-3), more preferably a structural unit represented by formula (AP-1) or formula (AP-2), still more preferably a structural unit represented by formula (AP -1) is a structural unit.

[In the formula,
^MAP1 represents a group obtained by removing one hydrogen atom from the metal complex represented by formula (1).
^MAP2 represents a group obtained by removing two hydrogen atoms from the metal complex represented by formula (1).
^MAP3 represents a group obtained by removing three hydrogen atoms from the metal complex represented by formula (1).
L ^AP1 each independently represents an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, a group represented by -N(R ^AP1 )-, an oxygen atom or a sulfur atom, and these groups are It may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. ^RAP1 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple ^LAP1 are present, they may be the same or different.
n ^AP1 represents an integer of 0 or more and 10 or less.
Ar ^AP1 represents a hydrocarbon group or a heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. ]

The examples and preferred ranges of L ^AP1 are the same as the examples and preferred ranges of L ^BP1 .
The examples and preferred ranges of ^RAP1 are the same as the examples and preferred ranges of ^RBP1 .
The examples and preferred ranges of ^nAP1 are the same as the examples and preferred ranges of ^nBP1 .
The examples and preferred ranges of Ar ^AP1 are the same as the examples and preferred ranges of Ar ^BP1 .

Examples of structural units (A) include structural units represented by the following formulas.

[In the formula,
Z ² represents a group represented by -CH= or a group represented by -N=. When multiple Z ² are present, they may be the same or different.
^RA represents a hydrogen atom or a primary substituent. When multiple ^RAs are present, they may be the same or different. ]

The content of the structural unit (A) contained in the polymer compound (A) may be within a range in which the function of the polymer compound (A) is exhibited. The content of the structural unit (A) contained in the polymer compound (A) is, for example, 0.01 to 100 mol% with respect to the total content of the structural units contained in the polymer compound (A). , preferably 0.1 to 99 mol%, more preferably 0.5 to 90 mol%, still more preferably 1 to 70 mol%, because the luminous efficiency of the light emitting device of the present disclosure is more excellent, Especially preferably 5 to 50 mol %, particularly preferably 10 to 30 mol %. 1 type of structural units (A) may be contained in the polymer compound (A), and 2 or more types may be contained.

Since the polymer compound (A) has superior luminous efficiency of the light-emitting device of the present disclosure, it is It is preferable to further include at least one selected structural unit. That is, the polymer compound (A) contains at least one structural unit selected from the group consisting of structural units represented by the formula (X) described later and structural units represented by the formula (Y) described later; It is preferably a polymer compound containing the unit (A).
The polymer compound (A) comprises at least one structural unit selected from the group consisting of structural units represented by the formula (X) described later and structural units represented by the formula (Y) described later, and a structural unit ( A), the structural unit (A) is preferably different from the structural unit represented by the formula (X) described later and the structural unit represented by the formula (Y) described later.
The polymer compound (A) preferably further contains a structural unit represented by the below-described formula (Y), since the light-emitting device of the present disclosure has better luminous efficiency.
Since the polymer compound (A) has excellent hole-transport properties and the luminous efficiency of the light-emitting device of the present disclosure is superior, the structural unit represented by the below-described formula (X) is It is preferable to further include.
Since the polymer compound (A) has excellent hole-transport properties and the light-emitting device of the present disclosure has excellent luminous efficiency, the structural unit represented by the formula (X) described below and It is preferable to further include a structural unit represented by formula (Y) described below.

When the polymer compound (A) contains a structural unit represented by formula (X) described later, the content of the structural unit represented by formula (X) described later is such that the function of the polymer compound (A) is It can be any range as long as it can be played. When the polymer compound (A) contains a structural unit represented by the formula (X) described below, the content of the structural unit represented by the formula (X) described below is the constitution included in the polymer compound (A). For example, it is 0.01 to 99.9 mol% with respect to the total content of the units, the hole transport property of the polymer compound (B) is excellent, and the luminous efficiency of the light emitting device of the present disclosure is higher. Since it is excellent, it is preferably 0.05 to 90 mol%, more preferably 0.1 to 70 mol%, still more preferably 0.2 to 50 mol%, particularly preferably 0.5 to 30 mol%. %, particularly preferably 1 to 10 mol %.
The structural unit represented by formula (X) may be contained in the polymer compound (A) singly or in combination of two or more.

When the polymer compound (A) contains the structural unit represented by the formula (Y), the content of the structural unit represented by the formula (Y) is within the range in which the polymer compound (A) functions. If it is When the polymer compound (A) contains the structural unit represented by the formula (Y), the content of the structural unit represented by the formula (Y) is the total of the structural units contained in the polymer compound (A). With respect to the content, for example, it is 0.1 to 99.99 mol%, and since the luminous efficiency of the light emitting device of the present disclosure is more excellent, it is preferably 1 to 99.9 mol%, more preferably 10 to It is 99.5 mol %, more preferably 30 to 99 mol %, particularly preferably 50 to 95 mol %, particularly preferably 70 to 90 mol %.
The structural unit represented by formula (Y) may be contained in the polymer compound (A) singly or in combination of two or more.

When the polymer compound (A) contains the structural unit represented by the formula (X) and/or the structural unit represented by the formula (Y), and the structural unit (A), it is represented by the formula (X) The total content of the structural unit represented by the formula (Y), the structural unit represented by the formula (Y), and the structural unit (A) may be within a range in which the function of the polymer compound (A) can be exhibited. When the polymer compound (A) contains the structural unit represented by the formula (X) and/or the structural unit represented by the formula (Y), and the structural unit (A), it is represented by the formula (X) The total content of the structural unit represented by the formula (Y) and the structural unit (A) is, for example, 1 It is preferably 10 to 100 mol%, more preferably 30, because the hole transport property of the polymer compound (A) is excellent and the luminous efficiency of the light emitting device of the present disclosure is more excellent. 100 mol %, more preferably 50 to 100 mol %, particularly preferably 70 to 100 mol %, particularly preferably 90 to 100 mol %.

Examples of the polymer compound (A) include polymer compounds AP-1 to AP-4. Here, "other" means a structural unit other than the structural unit (A), the structural unit represented by formula (X), and the structural unit represented by formula (Y).

[In the table, p ^a , q ^a , r ^a and ^sa represent the molar ratio (mol %) of each structural unit. p ^a +q ^{a +} ra +s ^a =100 and 70≦ ^pa +q ^a + ^ra ≦100. ]

The polymer compound (A) may be any of a block copolymer, a random copolymer, an alternating copolymer, a graft copolymer, or may be in other forms. It is preferably a copolymer obtained by copolymerizing monomers.

The example and preferred range of the polystyrene-equivalent number average molecular weight of the polymer compound (A) are the same as the example and preferred range of the polystyrene-equivalent number average molecular weight of the first polymer compound described below. The example and preferred range of the polystyrene-equivalent weight average molecular weight of the polymer compound (A) are the same as the example and preferred range of the polystyrene-equivalent weight average molecular weight of the first polymer compound described below.

(Method for producing polymer compound (A))
The polymer compound (A) can be produced by the same method as the method for producing the first polymer compound described below.

<Layer (1)>
The first layer is a compound represented by the formula (H-1), and at least one selected from the group consisting of structural units represented by the formula (X) and structural units represented by the formula (Y) It may further contain at least one selected from the group consisting of polymer compounds containing structural units of species.
Since the luminous efficiency of the light-emitting element of the present disclosure is superior, the first layer includes the compound (A), the compound (B), the compound represented by the formula (H-1), and the compound represented by the formula (X). Consists of a polymer compound (hereinafter also referred to as "first polymer compound") containing at least one structural unit selected from the group consisting of structural units represented by the formula (Y) and structural units represented by formula (Y) and at least one compound selected from the group (hereinafter also referred to as "first compound") and a layer (hereinafter also referred to as "layer (1)"). That is, the layer (1) is a layer containing the compound (A), the compound (B), and the first compound.
The layer (1) may contain only one kind of each of the compound (A), the compound (B) and the first compound, or may contain two or more kinds thereof.
The total content of the compound (A), the compound (B) and the first compound in the layer (1) may be within a range in which the layer (1) functions. The total content of the compound (A), the compound (B) and the first compound in the layer (1) may be, for example, 1 to 100% by mass based on the total amount of the layer (1), and the present disclosure is preferably 10 to 100% by mass, more preferably 30 to 100% by mass, even more preferably 50 to 100% by mass, and particularly preferably 70 to 100% by mass. %, particularly preferably 90 to 100% by mass.
The total content of the compound (A) and the compound (B) in the layer (1) may be within a range in which the layer (1) functions. The total content of the compound (A) and the compound (B) in the layer (1) is, when the total content of the compound (A), the compound (B) and the first compound is 100 parts by mass, for example , 0.01 to 99.9 parts by mass, preferably 0.1 to 99 parts by mass, more preferably 0.5 to 90 parts by mass, because the luminous efficiency of the light emitting device of the present disclosure is more excellent. , more preferably 1 to 70 parts by mass, particularly preferably 5 to 50 parts by mass, particularly preferably 10 to 30 parts by mass.
The content of the compound (B) in the layer (1) may be within a range where the function of the layer (1) is exhibited. The content of the compound (B) in the layer (1) is, for example, 0.01 to 99 parts by mass when the total content of the compound (A) and the compound (B) is 100 parts by mass. Since the luminous efficiency of the disclosed light-emitting device is more excellent, it is preferably 0.05 to 90 parts by mass, more preferably 0.1 to 70 parts by mass, and still more preferably 0.5 to 50 parts by mass. It is particularly preferably 1 to 30 parts by mass, particularly preferably 2 to 20 parts by mass.

In layer (1), compound (A), compound (B) and the first compound preferably interact physically, chemically or electrically. This interaction makes it possible, for example, to improve or adjust the light emitting properties, charge transport properties or charge injection properties of layer (1), resulting in better light emitting efficiency of the light emitting device of the present disclosure.

In the layer (1), taking the light-emitting material as an example, the first compound, the compound (A), and the compound (B) electrically interact to efficiently convert the first compound to the compound (A). By transferring electric energy to and further efficiently transferring electric energy from compound (A) to compound (B), compound (B) can be caused to emit light more efficiently, and light emission of the light-emitting element of the present disclosure Better efficiency.

From the above viewpoint, in the layer (1), the luminous efficiency of the light-emitting device of the present disclosure is more excellent, so the first compound has at least It is more preferable to have one function.
From the above viewpoint, in the layer (1), the luminous efficiency of the light-emitting device of the present disclosure is more excellent, so the compound (A) has at least It is more preferable to have one function.
From the above point of view, in the layer (1), the compound (B) more preferably has light-emitting properties, since the light-emitting device of the present disclosure has higher luminous efficiency.
From the above point of view, in the layer (1), the lowest excited singlet state (S ₁ ) of the first compound has superior luminous efficiency of the light emitting device of the present disclosure, so the lowest excited singlet state of the compound (A) A higher energy level than the state (S ₁ ) is preferred.
From the above point of view, in the layer (1), the lowest excited singlet state (S ₁ ) of the first compound has superior luminous efficiency of the light emitting device of the present disclosure, so the lowest excited singlet state of the compound (B) A higher energy level than the state (S ₁ ) is preferred.
From the above point of view, in the layer (1), the lowest excited singlet state (S ₁ ) of the compound (A) has a higher luminous efficiency of the light emitting device of the present disclosure, so the lowest excited singlet state of the compound (B) A higher energy level than the state (S ₁ ) is preferred.
From the above point of view, in the layer (1), the lowest excited triplet state (T ₁ ) of the first compound has superior luminous efficiency of the light-emitting device of the present disclosure, so the lowest excited triplet state of the compound (A) A higher energy level than the state (T ₁ ) is preferred.
From the above point of view, in the layer (1), the lowest excited triplet state (T ₁ ) of the first compound has a higher luminous efficiency of the light-emitting device of the present disclosure, so the lowest excited triplet state of the compound (B) A higher energy level than the state (T ₁ ) is preferred.
From the above point of view, in the layer (1), the lowest excited triplet state (T ₁ ) of the compound (A) has a higher luminous efficiency of the light-emitting device of the present disclosure, so the lowest excited triplet state of the compound (B) A higher energy level than the state (T ₁ ) is preferred.

As the first compound, since the light-emitting element of this embodiment can be manufactured by a wet method, it is preferable that the first compound exhibits solubility in a solvent capable of dissolving the compound (B) and the compound (A). preferable.

In the layer (1), the first compound is preferably a host material, an assisting dopant material, or a dopant material, and is preferably a host material or an assisting dopant material, because the light-emitting device of the present disclosure has higher luminous efficiency. More preferably, it is a host material.
In the first layer (e.g., layer (1)), the compound (A) is preferably a host material, an assist dopant material, or a dopant material because the light emitting device of the present disclosure has superior luminous efficiency. It is more preferably a material or dopant material, and even more preferably an assist dopant material.
In the first layer (e.g., layer (1)), the metal complex represented by formula (1) is a host material, an assist dopant material, or a dopant material because the luminous efficiency of the light emitting device of the present disclosure is superior. is preferred, the assist dopant material or dopant material is more preferred, and the assist dopant material is even more preferred.
In the first layer (e.g., layer (1)), the polymer compound (A) is preferably a host material, an assist dopant material, or a dopant material, since the light emitting device of the present disclosure has superior luminous efficiency, It is more preferably a host material or an assist dopant material, and even more preferably an assist dopant material.
In the first layer (e.g., layer (1)), the polymer compound (A) may have at least one function selected from a host material, an assist dopant material, and a dopant material. It may have at least two functions of the assist dopant material and the dopant material, or may have three functions of the host material, the assist dopant material and the dopant material.
In the first layer (e.g., layer (1)), the compound (B) is preferably a host material, an assist dopant material, or a dopant material because the light emitting device of the present disclosure has higher luminous efficiency. It is more preferably a material or dopant material, even more preferably a dopant material.
In the first layer (e.g., layer (1)), the low-molecular-weight compound (B) is preferably a host material, an assist dopant material, or a dopant material because the light-emitting device of the present disclosure has superior luminous efficiency. It is more preferably an assist dopant material or a dopant material, and even more preferably a dopant material.
In the first layer (e.g., layer (1)), the polymer compound (B) is preferably a host material, an assist dopant material, or a dopant material, since the light emitting device of the present disclosure has superior luminous efficiency, It is more preferably a host material or a dopant material, and even more preferably a dopant material.
In the first layer (e.g., layer (1)), the polymer compound (B) may have at least one function selected from a host material, an assist dopant material, and a dopant material. It may have at least two functions of the assist dopant material and the dopant material, or may have three functions of the host material, the assist dopant material and the dopant material.

In the light emitting device of the present disclosure, the host material is preferably a material that physically, chemically or electrically interacts with the assist dopant material. In the light emitting device of the present disclosure, the host material is preferably a material that physically, chemically or electrically interacts with the dopant material. In the light emitting device of the present disclosure, the assist dopant material is preferably a material that physically, chemically or electrically interacts with the dopant material. In the light-emitting device of the present disclosure, the host material, assisting dopant material, and dopant material preferably interact physically, chemically, or electrically. These interactions make it possible to improve or adjust, for example, the light-emitting properties, charge transport properties, or charge injection properties of the light-emitting device of the present disclosure, resulting in better luminous efficiency of the light-emitting device of the present disclosure.

In the light-emitting device of the present disclosure, if the light-emitting material is described as an example, the host material, the assisting dopant material, and the dopant material electrically interact to efficiently transfer electrical energy from the host material to the assisting dopant material, and further By efficiently transferring electric energy from the assist dopant material to the dopant material, the dopant material can be caused to emit light more efficiently, and the light emitting device of the present disclosure has better light emission efficiency.

From the above viewpoint, in the light-emitting element of the present disclosure, the luminous efficiency of the light-emitting element of the present disclosure is more excellent, so that the host material has at least one selected from hole-injecting properties, hole-transporting properties, electron-injecting properties, and electron-transporting properties. It is more preferable to have two functions.
From the above viewpoint, in the light-emitting device of the present disclosure, since the light-emitting device of the present disclosure has better luminous efficiency, the assist dopant material is at least selected from hole injection properties, hole transport properties, electron injection properties, and electron transport properties. It is more preferable to have one function.
From the above viewpoint, in the light-emitting element of the present disclosure, the dopant material preferably has light-emitting properties because the luminous efficiency of the light-emitting element of the present disclosure is more excellent.
From the above point of view, in the light-emitting device of the present disclosure, the lowest excited singlet state (S ₁ ) of the host material has a higher emission efficiency of the light-emitting device of the present disclosure, so the lowest excited singlet state of the assist dopant material ( S ₁ ) is preferably at a higher energy level.
From the above point of view, in the light-emitting device of the present disclosure, the lowest excited singlet state (S ₁ ) of the host material has a higher luminous efficiency of the light-emitting device of the present disclosure, so the lowest excited singlet state of the dopant material (S ₁ ) Higher energy levels are preferred.
From the above point of view, in the light emitting device of the present disclosure, the lowest excited singlet state (S ₁ ) of the assist dopant material has a higher luminous efficiency, so the lowest excited singlet state of the dopant material ( S ₁ ) is preferably at a higher energy level.
From the above point of view, in the light-emitting device of the present disclosure, the lowest excited triplet state (T ₁ ) of the host material has a higher emission efficiency of the light-emitting device of the present disclosure, so the lowest excited triplet state of the assist dopant material ( T ₁ ) is preferably a higher energy level.
From the above point of view, in the light-emitting device of the present disclosure, the lowest excited triplet state (T ₁ ) of the host material has a higher emission efficiency of the light-emitting device of the present disclosure, so the lowest excited triplet state of the dopant material (T ₁ ) Higher energy levels are preferred.
From the above point of view, in the light-emitting device of the present disclosure, the lowest excited triplet state (T ₁ ) of the assist dopant material has better luminous efficiency of the light-emitting device of the present disclosure, so the lowest excited triplet state of the dopant material ( T ₁ ) is preferably a higher energy level.

In the light emitting device of the present disclosure, when the first layer is a layer containing an assist dopant material and a dopant material, the total content of the assist dopant material and the dopant material in the first layer is It is sufficient if it is within the range where the function as In the light emitting device of the present disclosure, when the first layer is a layer containing an assist dopant material and a dopant material, the total content of the assist dopant material and the dopant material in the first layer is, for example, the first It may be 0.01 to 100% by mass based on the total amount of the layer, and is preferably 0.1 to 99% by mass, more preferably 0.5 to 90% by mass, more preferably 1 to 70% by mass, particularly preferably 5 to 50% by mass, particularly preferably 10 to 30% by mass.
In the light-emitting device of the present disclosure, when the first layer is a layer containing an assist dopant material and a dopant material, the content of the dopant material in the first layer is such that the first layer functions as It is acceptable if it is within the range of In the light emitting device of the present disclosure, when the first layer is a layer containing an assist dopant material and a dopant material, the content of the dopant material in the first layer is the total content of the assist dopant material and the dopant material. When the amount is 100 parts by mass, for example, it is 0.01 to 99 parts by mass, and since the luminous efficiency of the light emitting device of the present disclosure is more excellent, it is preferably 0.05 to 90 parts by mass, more preferably 0 .1 to 70 parts by mass, more preferably 0.5 to 50 parts by mass, particularly preferably 1 to 30 parts by mass, particularly preferably 2 to 20 parts by mass.

In the light emitting device of the present disclosure, when the first layer is a layer containing a host material and a dopant material, the total content of the host material and the dopant material in the first layer is Any range is acceptable as long as the function can be achieved. In the light emitting device of the present disclosure, when the first layer is a layer containing a host material and a dopant material, the total content of the host material and the dopant material in the first layer is, for example, the first layer may be 0.1 to 100% by mass based on the total amount of, and the driving voltage of the light-emitting device of the present disclosure is lower, so it is preferably 1 to 99.9% by mass, more preferably 10 to 99. 9% by mass, more preferably 30 to 99% by mass, particularly preferably 50 to 95% by mass, particularly preferably 70 to 90% by mass.
In the light emitting device of the present disclosure, when the first layer is a layer containing a host material and a dopant material, the content of the dopant material in the first layer functions as the first layer. Any range is acceptable. In the light emitting device of the present disclosure, when the first layer is a layer containing a host material and a dopant material, the content of the dopant material in the first layer is the total content of the host material and the dopant material. When it is 100 parts by mass, it is, for example, 0.01 to 99 parts by mass, and the driving voltage of the light emitting device of the present disclosure is lower, so it is preferably 0.05 to 90 parts by mass, more preferably 0.05 part by mass. It is 1 to 70 parts by mass, more preferably 0.2 to 50 parts by mass, particularly preferably 0.5 to 30 parts by mass, and most preferably 1 to 10 parts by mass.

In the light emitting device of the present disclosure, when the first layer is a layer containing a host material, an assist dopant material and a dopant material, the total content of the host material, the assist dopant material and the dopant material in the first layer may be within a range in which the function as the first layer is exhibited. In the light emitting device of the present disclosure, when the first layer is a layer containing a host material, an assist dopant material and a dopant material, the total content of the host material, the assist dopant material and the dopant material in the first layer may be, for example, 1 to 100% by mass based on the total amount of the first layer, and is preferably 10 to 100% by mass, more preferably 30% because the luminous efficiency of the light emitting device of the present disclosure is superior. 100% by mass, more preferably 50 to 100% by mass, particularly preferably 70 to 100% by mass, particularly preferably 90 to 100% by mass.
In the light emitting device of this embodiment, when the first layer is a layer containing a host material, an assist dopant material and a dopant material, the total content of the assist dopant material and the dopant material in the first layer is The thickness may be within a range in which the function as the first layer can be exhibited. In the light-emitting device of the present disclosure, when the first layer is a layer containing a host material, an assist dopant material, and a dopant material, the total content of the assist dopant material and the dopant material in the first layer is When the total content of the material, the assist dopant material and the dopant material is 100 parts by mass, for example, it is 0.01 to 99.9 parts by mass, and the luminous efficiency of the light emitting device of the present disclosure is more excellent, so it is preferable 0.1 to 99 parts by mass, more preferably 0.5 to 90 parts by mass, still more preferably 1 to 70 parts by mass, particularly preferably 5 to 50 parts by mass, particularly preferably 10 to 30 parts by mass.
In the light emitting device of the present disclosure, when the first layer is a layer containing a host material, an assist dopant material, and a dopant material, the total content of the dopant materials in the first layer is It is sufficient if it is within the range where the function of In the light-emitting device of the present disclosure, when the first layer is a layer containing a host material, an assist dopant material, and a dopant material, the content of the dopant material in the first layer is When the total content is 100 parts by mass, for example, it is 0.01 to 99 parts by mass, and the luminous efficiency of the light emitting device of the present disclosure is more excellent, so it is preferably 0.05 to 90 parts by mass. It is preferably 0.1 to 70 parts by mass, more preferably 0.5 to 50 parts by mass, particularly preferably 1 to 30 parts by mass, and most preferably 2 to 20 parts by mass.

The assist dopant material preferably exhibits solubility in a solvent capable of dissolving the dopant material, since the light-emitting device of the present disclosure can be produced by a wet method. The host material preferably exhibits solubility in a solvent capable of dissolving the assist dopant material and the dopant material, since the light-emitting device of the present disclosure can be produced by a wet method.

[First compound]
The first compound is at least one selected from the group consisting of the compound represented by formula (H-1) and the first polymer compound.

(Compound represented by formula (H-1))
The compound represented by formula (H-1) is preferably a low-molecular-weight compound.
The molecular weight of the compound represented by formula (H-1) is preferably from 1×10 ² to 5×10 3 , more preferably from 2×10 2 to 5× ^{10 3} , since the luminous efficiency of the light-emitting device of the present disclosure is more excellent. 3×10 ³ , more preferably 3×10 ² to 1.5×10 ³ , particularly preferably 4×10 ² to 1×10 ³ .
The compound represented by formula (H-1) is preferably a compound different from compound (B), and more preferably a compound that does not have a condensed heterocyclic skeleton (b).

The aryl group in Ar ^H1 and Ar ^H2 is preferably directly bonded to an atom constituting a ring of monocyclic or 2- to 7-cyclic aromatic hydrocarbons, because the luminous efficiency of the light-emitting device of the present disclosure is superior. a group from which one hydrogen atom has been removed, more preferably a monocyclic or bi- to five-ring aromatic hydrocarbon group from which one hydrogen atom directly bonded to an atom constituting a ring has been removed, More preferably, it is a group obtained by removing one hydrogen atom directly bonded to a ring-constituting atom from a monocyclic, bicyclic or tricyclic aromatic hydrocarbon, and these groups have a substituent. may be
The aryl groups in Ar ^{1 H1} and Ar ^{2 H2} are preferably benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene, fluorene, benzoanthracene, benzophenanthrene, benzofluorene, and dibenzoanthracene, because the luminous efficiency of the light-emitting device of the present disclosure is further excellent. , dibenzophenanthrene, dibenzofluorene, indenofluorene or benzofluoranthene, from which one hydrogen atom directly bonded to a ring-constituting atom is removed, more preferably benzene, naphthalene, anthracene, phenanthrene, dihydro phenanthrene, fluorene, benzoanthracene, benzophenanthrene or benzofluorene, from which one hydrogen atom directly bonded to a ring-constituting atom is removed, more preferably benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene or fluorene A group in which one hydrogen atom directly bonded to a ring-constituting atom is removed from, particularly preferably benzene, naphthalene or anthracene, in which one hydrogen atom directly bonded to a ring-constituting atom is removed. and these groups may have a substituent.

The monovalent heterocyclic group in Ar ^H1 and Ar ^H2 is a group obtained by removing one hydrogen atom directly bonded to a ring-constituting atom from a heterocyclic compound that does not contain a condensed heterocyclic skeleton (b). is preferred, and this group may have a substituent. In the monovalent heterocyclic group for Ar ^H1 and Ar ^H2 , the heterocyclic compound that does not contain a condensed heterocyclic skeleton (b) includes, for example, among the heterocyclic compounds described in the section on the heterocyclic group above, , a boron atom and at least one selected from the group consisting of an oxygen atom, a sulfur atom, a selenium atom, an ^sp3 carbon atom and a nitrogen atom in the ring.
The monovalent heterocyclic groups in Ar ^H1 and Ar ^H2 are preferably monocyclic or di- to hepta-cyclic heterocyclic compounds (preferably condensed heterocyclic A group obtained by removing one hydrogen atom directly bonded to a ring-constituting atom from a monocyclic or 2- to 7-ring heterocyclic compound containing no ring skeleton (b), more preferably a single to an atom constituting a ring from a cyclic or bi- to pentacyclic heterocyclic compound (preferably a monocyclic or bi- to pentacyclic heterocyclic compound that does not contain a condensed heterocyclic skeleton (b)) a group excluding one directly bonded hydrogen atom, more preferably a monocyclic, bicyclic or tricyclic heterocyclic compound (preferably a single A cyclic, bicyclic or tricyclic heterocyclic compound) from which one hydrogen atom directly bonded to an atom constituting the ring is removed, particularly preferably a tricyclic heterocyclic compound ( Preferably, it is a group obtained by removing one hydrogen atom directly bonded to a ring-constituting atom from a tricyclic heterocyclic compound that does not contain a condensed heterocyclic skeleton (b)), and these groups are substituents may have
The monovalent heterocyclic groups in Ar ^H1 and Ar ^H2 are preferably furan, thiophene, oxadiazole, thiadiazole, pyrrole, diazole, triazole, pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, benzofuran, benzothiophene, indole, azaindole, diazaindole, benzodiazole, benzothiadiazole, benzotriazole, dibenzofuran, dibenzothiophene, carbazole, azacarbazole, diazacarbazole, phenoxazine, phenothiazine, 9,10-dihydroacridine, 5,10-dihydrophenazine, azaanthracene, diazaanthracene, azaphenanthrene, diazaphenanthrene, benzocarbazole, azabenzocarbazole, diazabenzocarbazole, benzonaphthofuran, benzonaphthothiophene, a group obtained by removing one hydrogen atom directly bonded to a ring-constituting atom from dibenzocarbazole, indolocarbazole, indenocarbazole, azaindolocarbazole, diazaindolocarbazole, azaindenocarbazole or diazaindenocarbazole; more preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, carbazole, azacarbazole, diazacarbazole, phenoxazine, phenothiazine, 9,10-dihydroacridine, 5,10-dihydro Phenazine, benzocarbazole, azabenzocarbazole, diazabenzocarbazole, benzonaphthofuran, benzonaphthothiophene, dibenzocarbazole, indolocarbazole, indenocarbazole, azaindolocarbazole, diazaindolocarbazole, azaindenocarbazole or diaza a group obtained by removing one hydrogen atom directly bonded to an atom constituting a ring from indenocarbazole, more preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, carbazole, azacarbazole , diazacarbazole, phenoxazine, phenothiazine, 9,10-dihydroacridine or 5,10-dihydrophenazine with one hydrogen atom directly bonded to a ring-constituting atom removed, particularly preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, or carbazole without one hydrogen atom directly bonded to a ring-constituting atom; is a group excluding one hydrogen atom directly bonded to the atoms constituting the, and these groups may have a substituent.

In the substituted amino group for Ar ^H1 and Ar ^H2 , the substituent possessed by the amino group is preferably an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and these groups further have a substituent. good too. Examples and preferred ranges of the aryl group, which is a substituent of the amino group, are the same as the examples and preferred ranges of the aryl group in Ar ^H1 and Ar ^H2 . Examples and preferred ranges of the monovalent heterocyclic group which is a substituent of the amino group are the same as the examples and preferred range of the monovalent heterocyclic group in Ar ^{1 H1} and Ar ^{2 H2} .

At least one of Ar ^H1 and Ar ^H2 is preferably an aryl group or a monovalent heterocyclic group, and both Ar ^H1 and Ar ^H2 are aryl groups, because the luminous efficiency of the light-emitting device of the present disclosure is superior. or a monovalent heterocyclic group, and these groups may have a substituent.
The aryl group and monovalent heterocyclic group for Ar ^H1 and Ar ^H2 are monocyclic, bicyclic or tricyclic aromatic hydrocarbons, or from a monocyclic, bicyclic or tricyclic heterocyclic compound (preferably a monocyclic, bicyclic or tricyclic heterocyclic compound that does not contain a condensed heterocyclic skeleton (b)), A group having one hydrogen atom directly bonded to a ring-constituting atom is preferably removed, and the ring is composed of benzene, naphthalene, fluorene, pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, or carbazole. is more preferably a group excluding one hydrogen atom directly bonded to the atom to which Particularly preferably, these groups may have a substituent.

Preferred substituents that Ar ^H1 and Ar ^H2 may have are a halogen atom, a cyano group, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryloxy group, an aryl group, and a monovalent A heterocyclic group or a substituted amino group, more preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a monovalent heterocyclic group or a substituted amino group, still more preferably an alkyl group , a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, particularly preferably an alkyl group, a cycloalkyl group or an aryl group, even if these groups further have a substituent good.
Examples and preferred ranges of the aryl group, monovalent heterocyclic group and substituted amino group in the substituents that Ar ^H1 and Ar ^H2 may have are the aryl group and monovalent heterocyclic group in Ar ^H1 and Ar ^H2 , respectively. It is the same as the examples and preferred ranges of the cyclic group and the substituted amino group.

Preferred substituents that the substituents Ar ^H1 and Ar ^H2 may further have include a halogen atom, a cyano group, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryloxy group, an aryl group, a monovalent heterocyclic group or a substituted amino group, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, still more preferably , an alkyl group, a cycloalkyl group or an aryl group, particularly preferably an alkyl group or a cycloalkyl group, and these groups may further have a substituent, but should not have a further substituent. is preferred.
Examples and preferred ranges of the aryl group, monovalent heterocyclic group and substituted amino group in the substituents which the substituents which Ar ^H1 and Ar ^H2 may further have are respectively Ar ^H1 and The same as the examples and preferred ranges of the aryl group, monovalent heterocyclic group and substituted amino group in Ar ^H2 .

The divalent group for L ^H1 is preferably an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, -N(R ⁰ )- a group represented by -(O=)P(R ⁰ )-, a group represented by -O-, a group represented by -S-, and -S(=O) ₂ - or a group represented by -C(=O)-, more preferably an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, or a group represented by -N(R ⁰ )- A group represented by -O- or a group represented by -S-, more preferably an alkylene group, a cycloalkylene group, an arylene group or a divalent heterocyclic group, particularly preferably , an arylene group or a divalent heterocyclic group, and these groups may have a substituent.
At least one of the divalent groups in L ^H1 is preferably an alkylene group, a cycloalkylene group, an arylene group, or a divalent heterocyclic group, more preferably a divalent heterocyclic group, since the light-emitting device of the present disclosure has superior luminous efficiency. is an arylene group or a divalent heterocyclic group, and these groups may have a substituent.

In the divalent group L ^H1 , the arylene group is preferably a monocyclic or bi- to seven-cyclic aromatic hydrocarbon ring-constituting atom because the luminous efficiency of the light-emitting device of the present disclosure is superior. A group in which 2 hydrogen atoms directly bonded are removed, more preferably a group in which 2 hydrogen atoms directly bonded to atoms constituting a ring are removed from a monocyclic or bi- to pentacyclic aromatic hydrocarbon and more preferably a group obtained by removing two hydrogen atoms directly bonded to the atoms constituting the ring from a monocyclic, bicyclic or tricyclic aromatic hydrocarbon, and these groups are substituents may have
Among the divalent groups in L ^H1 , an arylene group is preferably benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene, fluorene, benzanthracene, benzophenanthrene, or benzofluorene, since the light-emitting device of the present disclosure has superior luminous efficiency. , dibenzoanthracene, dibenzophenanthrene, dibenzofluorene, indenofluorene or benzofluoranthene, from which two hydrogen atoms directly bonded to the atoms constituting the ring are removed, more preferably benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene, fluorene, benzanthracene, benzophenanthrene or benzofluorene, from which two hydrogen atoms directly bonded to atoms constituting the ring are removed, more preferably benzene, naphthalene, anthracene, phenanthrene, dihydro A group obtained by removing two hydrogen atoms directly bonded to ring-constituting atoms from phenanthrene or fluorene, particularly preferably benzene, naphthalene or anthracene, and removing two hydrogen atoms directly bonded to ring-constituting atoms. These groups may have substituents.

In the divalent group in L ^H1 , the divalent heterocyclic group is a hydrogen atom directly bonded to a ring-constituting atom (preferably a carbon atom) from a heterocyclic compound that does not contain a condensed heterocyclic skeleton (b). It is preferably a group excluding two, and this group may have a substituent. In the divalent group in L ^H1 , the heterocyclic compound that does not contain a condensed heterocyclic skeleton (b) in the divalent heterocyclic group includes the heterocyclic compounds described in the section on the heterocyclic group above. , a boron atom and at least one selected from the group consisting of an oxygen atom, a sulfur atom, a selenium atom, an ^sp3 carbon atom and a nitrogen atom in the ring.
Among the divalent groups in L ^H1 , the divalent heterocyclic group is preferably a monocyclic or di- to hepta-cyclic heterocyclic compound (preferably , a monocyclic or 2- to 7-ring heterocyclic compound that does not contain a condensed heterocyclic skeleton (b)) from which two hydrogen atoms directly bonded to the atoms (preferably carbon atoms) constituting the ring are removed group, more preferably a monocyclic or bi- to pentacyclic heterocyclic compound (preferably a monocyclic or bi- to pentacyclic heterocyclic compound that does not contain a condensed heterocyclic skeleton (b) A group obtained by removing two hydrogen atoms directly bonded to atoms (preferably carbon atoms) constituting a ring from a compound), more preferably a monocyclic, bicyclic or tricyclic heterocyclic compound ( Preferably, a hydrogen atom 2 directly bonded to an atom (preferably a carbon atom) constituting a ring from a monocyclic, bicyclic or tricyclic heterocyclic compound that does not contain a condensed heterocyclic skeleton (b) is a group excluding one, particularly preferably a tricyclic heterocyclic compound (preferably a tricyclic heterocyclic compound that does not contain a condensed heterocyclic skeleton (b)), atoms constituting a ring (preferably a carbon atom) without two hydrogen atoms directly bonded thereto, and these groups may have a substituent.
Among the divalent groups in L ^H1 , a divalent heterocyclic group is preferably furan, thiophene, oxadiazole, thiadiazole, pyrrole, diazole, triazole, or pyridine, since the light-emitting device of the present disclosure has superior luminous efficiency. , diazabenzene, triazine, azanaphthalene, diazanaphthalene, benzofuran, benzothiophene, indole, azaindole, diazaindole, benzodiazole, benzothiadiazole, benzotriazole, dibenzofuran, dibenzothiophene, carbazole, azacarbazole, diazacarbazole, phenoxazine, phenothiazine, 9,10-dihydroacridine, 5,10-dihydrophenazine, azaanthracene, diazaanthracene, azaphenanthrene, diazaphenanthrene, benzocarbazole, azabenzocarbazole, diazabenzocarbazole, benzonaphthofuran, benzo directly bonded to a ring-constituting atom (preferably a carbon atom) of naphthothiophene, dibenzocarbazole, indolocarbazole, indenocarbazole, azaindolocarbazole, diazaindolocarbazole, azaindenocarbazole or diazaindenocarbazole; a group with two hydrogen atoms removed, more preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, carbazole, azacarbazole, diazacarbazole, phenoxazine, phenothiazine, 9,10 - dihydroacridine, 5,10-dihydrophenazine, benzocarbazole, azabenzocarbazole, diazabenzocarbazole, benzonaphthofuran, benzonaphthothiophene, dibenzocarbazole, indolocarbazole, indenocarbazole, azaindolocarbazole, diazaindro carbazole, azaindenocarbazole or diazaindenocarbazole without two hydrogen atoms directly bonded to atoms (preferably carbon atoms) constituting the ring, more preferably pyridine, diazabenzene, triazine, aza Atoms (preferably carbon atoms) forming a ring from naphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, carbazole, azacarbazole, diazacarbazole, phenoxazine, phenothiazine, 9,10-dihydroacridine or 5,10-dihydrophenazine is a group excluding two hydrogen atoms directly bonded to, particularly preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene or carbazole ring-constituting atoms (preferably carbon atoms) A group in which two hydrogen atoms directly bonded to are removed, and particularly preferably a group in which two hydrogen atoms directly bonded to ring-constituting atoms (preferably carbon atoms) from dibenzofuran, dibenzothiophene or carbazole are removed. and these groups may have a substituent.

In the divalent group for L ^H1 , the alkylene group is preferably a methylene group, an ethylene group or a propylene group, more preferably a methylene group, and these groups may have a substituent.

Examples and preferred ranges of substituents that L ^H1 may have are the same as examples and preferred ranges of substituents that Ar ^H1 and Ar ^H2 may have.

In the divalent group in L ^H1 , R ⁰ is preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group or a monovalent heterocyclic group, An aryl group is more preferable, and these groups may have a substituent.
Examples and preferred ranges of the aryl group and monovalent heterocyclic group for R ⁰ in the divalent group for L ^H1 are the examples and preferred ranges for the aryl group and monovalent heterocyclic group for Ar ^H1 and Ar ^H2 , respectively. is the same as
In the divalent group for L ^H1 , examples and preferred ranges of substituents that R ⁰ may have are the same as examples and preferred ranges of substituents that Ar ^H1 and Ar ^H2 may have. .

n ^H1 is usually an integer of 0 or more and 10 or less, preferably an integer of 0 or more and 7 or less, more preferably an integer of 1 or more and 5 or less, and still more preferably an integer of 1 or more and 3 or less, 1 or 2 is particularly preferred.

Ar ^H1 and Ar ^H2 may be directly bonded or bonded via a divalent group to form a ring, but the compound represented by formula (H-1) is easy to synthesize. Therefore, it is preferred not to form a ring.
When Ar ^H1 and Ar ^H2 are bonded via a divalent group to form a ring, the divalent group is preferably an alkylene group, a cycloalkylene group, an arylene group, a divalent hetero A cyclic group, a group represented by -N(R ⁰ )-, a group represented by -(O=)P(R ⁰ )-, a group represented by -O-, a group represented by -S- , a group represented by -S(=O) ₂ - or a group represented by -C(=O)-, more preferably an alkylene group, a cycloalkylene group, or a group represented by -N(R ⁰ )- a group represented by -O- or a group represented by -S-, more preferably an alkylene group, a group represented by -O- or a group represented by -S- , these groups may have a substituent.
When Ar ^H1 and Ar ^H2 are bonded via a divalent group to form a ring, examples and preferred ranges of the arylene group, divalent heterocyclic group and alkylene group in the divalent group are They are the same as the examples and preferred ranges of the arylene group, divalent heterocyclic group and alkylene group in L ^H1 , respectively.
When Ar ^H1 and Ar ^H2 are bonded through a divalent group to form a ring, examples and preferred ranges of R ⁰ in the divalent group are R ⁰ in the divalent group of L ^H1 is the same as the example and preferred range of
When Ar ^{1 H1} and Ar 2 ^H2 are bonded via a divalent group to form a ring, examples and preferred ranges of substituents that the divalent group may have include Ar ^H1 and Ar It is the same as the example and preferred range of the substituent that ^H2 may have.

L ^{1 H1} and Ar ^{1 H1} may be directly bonded or bonded via a divalent group to form a ring, but the compound represented by formula (H-1) is easy to synthesize. Therefore, it is preferred not to form a ring. Examples and preferred ranges of the divalent group in the case where L ^H1 and Ar ^H1 are bonded via a divalent ^group to form ^a ring are: are the same as the examples and preferred ranges of the divalent group in the case of forming a ring by combining with each other.
L ^H1 and Ar ^H2 may be directly bonded or bonded via a divalent group to form a ring, but the compound represented by formula (H-1) is easily synthesized. Therefore, it is preferred not to form a ring. Examples and preferred ranges of ^{the divalent group in the case where L H1 and Ar H2 are bonded} via a divalent group to form a ^ring are: are the same as the examples and preferred ranges of the divalent group in the case of forming a ring by combining with each other.

Examples of the compound represented by formula (H-1) include compounds represented by the following formula.

(First polymer compound)
The first polymer compound is a polymer compound containing at least one structural unit selected from the group consisting of structural units represented by formula (X) and structural units represented by formula (Y).

The first polymer compound is preferably a polymer compound different from the polymer compound (A) and the polymer compound (B), and is a polymer compound that does not contain the structural unit (A) and the structural unit (B). is more preferable.

The first polymer compound preferably contains a structural unit represented by the formula (Y), since the light emitting device of the present disclosure has higher luminous efficiency.
When the first polymer compound contains the structural unit represented by formula (Y), the content of the structural unit represented by formula (Y) contained in the first polymer compound is Any range is acceptable as long as it functions as a molecular compound. When the first polymer compound contains the structural unit represented by formula (Y), the content of the structural unit represented by formula (Y) contained in the first polymer compound is It is, for example, 1 to 100 mol% with respect to the total content of structural units contained in the molecular compound, and is preferably 10 to 100 mol% because the luminous efficiency of the light-emitting device of the present disclosure is more excellent. It is preferably 30 to 100 mol %, more preferably 50 to 100 mol %, particularly preferably 70 to 100 mol %, particularly preferably 90 to 100 mol %.
In the first polymer compound, the structural unit represented by the formula (Y) may be contained in one kind, or may be contained in two or more kinds.

The first polymer compound contains a structural unit represented by formula (X), since the first polymer compound has excellent hole-transport properties and the light-emitting device of the present disclosure has superior luminous efficiency. is preferred.
When the first polymer compound contains a structural unit represented by formula (X), the content of the structural unit represented by formula (X) contained in the first polymer compound is Any range is acceptable as long as it functions as a molecular compound. When the first polymer compound contains a structural unit represented by formula (X), the content of the structural unit represented by formula (X) contained in the first polymer compound is For example, it is 0.01 to 100 mol% with respect to the total content of the structural units contained in the molecular compound, the hole transport property of the first polymer compound is excellent, and the light emitting device of the present disclosure is obtained. It is preferably 0.05 to 90 mol %, more preferably 0.1 to 70 mol %, still more preferably 0.2 to 50 mol %, and particularly preferably 0.05 to 90 mol %, more preferably 0.1 to 70 mol %, because the luminous efficiency is more excellent. 5 to 30 mol %, particularly preferably 1 to 10 mol %.
In the first polymer compound, the structural unit represented by the formula (X) may be contained in one kind, or may be contained in two or more kinds.

Since the first polymer compound has excellent hole-transport properties and the light-emitting device of the present disclosure has superior luminous efficiency, the structural unit represented by formula (Y) and the formula ( It preferably contains a structural unit represented by X).
When the first polymer compound contains a structural unit represented by the formula (Y) and a structural unit represented by the formula (X), it is represented by the formula (Y) contained in the first polymer compound The total content of the structural units and the structural units represented by formula (X) may be within a range in which the function as the first polymer compound can be exhibited. When the first polymer compound contains a structural unit represented by the formula (Y) and a structural unit represented by the formula (X), it is represented by the formula (Y) contained in the first polymer compound The total content of the structural units and the structural units represented by the formula (X) is, for example, 1 to 100 mol%, the hole transport property of the first polymer compound is excellent, and the light emission of the present disclosure It is preferably 10 to 100 mol%, more preferably 30 to 100 mol%, even more preferably 50 to 100 mol%, and particularly preferably 70 to 100 mol%, because the luminous efficiency of the device is better. and particularly preferably 90 to 100 mol %.

The arylene group represented by the structural unit Ar ^Y1 represented by the formula (Y) is preferably a monocyclic or bicyclic to hexacyclic aromatic group because the luminous efficiency of the light emitting device of the present disclosure is superior. a group obtained by removing two hydrogen atoms directly bonded to atoms constituting a ring from a group hydrocarbon, more preferably a monocyclic, bicyclic or tricyclic aromatic hydrocarbon more preferably, benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene or fluorene, excluding two hydrogen atoms directly bonded to atoms constituting the ring. and particularly preferably a group obtained by removing two hydrogen atoms directly bonded to ring-constituting atoms from benzene, phenanthrene, dihydrophenanthrene or fluorene, and these groups have a substituent and good too.
The divalent heterocyclic group represented by Ar ^Y1 has superior luminous efficiency of the light-emitting device of the present disclosure, and therefore preferably includes a monocyclic or bicyclic to hexacyclic heterocyclic compound. A group excluding two hydrogen atoms directly bonded to constituent atoms, more preferably a hydrogen directly bonded to a ring-constituting atom from a monocyclic, bicyclic or tricyclic heterocyclic compound groups with two atoms removed, more preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, phenoxazine, phenothiazine, 9,10-dihydroacridine or 5,10- A group obtained by removing two hydrogen atoms directly bonded to a ring-constituting atom (preferably a carbon atom or a nitrogen atom, more preferably a carbon atom) from dihydrophenazine, particularly preferably pyridine, diazabenzene, triazine, or carbazole. , dibenzofuran, dibenzothiophene, phenoxazine or phenothiazine, excluding two hydrogen atoms directly bonded to ring-constituting atoms (preferably carbon atoms or nitrogen atoms, more preferably carbon atoms), and these groups may have a substituent.
In the divalent group in which at least one arylene group and at least one divalent heterocyclic group represented by Ar ^Y1 are directly bonded, the preferred ranges of the arylene group and the divalent heterocyclic group are, respectively, It is the same as the preferred range of the arylene group and divalent heterocyclic group represented by Ar ^Y1 .

In Ar ^Y1 , the "divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded" includes, for example, groups represented by the following formulae, A group may have a substituent.

Ar ^Y1 is preferably an optionally substituted arylene group because the light emitting device of the present disclosure has better luminous efficiency.

The substituent that the group represented by Ar ^Y1 may have is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino or a fluorine atom, more preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a monovalent heterocyclic group or a substituted amino group, still more preferably an alkyl group or a cycloalkyl A group, an aryl group, a monovalent heterocyclic group or a substituted amino group, particularly preferably an alkyl group, a cycloalkyl group or an aryl group, and these groups may further have a substituent.
The aryl group in the substituent that the group represented by Ar ^Y1 may have is preferably a monocyclic or bicyclic to hexacyclic aromatic group because the luminous efficiency of the light emitting device of the present disclosure is superior. A group obtained by removing one hydrogen atom directly bonded to a ring-constituting atom from a hydrocarbon, more preferably a monocyclic, bicyclic or tricyclic aromatic hydrocarbon A group from which one hydrogen atom directly bonded to an atom has been removed, more preferably from benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene or fluorene, from which one hydrogen atom directly bonded to a ring-constituting atom has been removed group, particularly preferably benzene, phenanthrene, dihydrophenanthrene or fluorene, with one hydrogen atom directly bonded to a ring-constituting atom removed, these groups further having a substituent good too.
The monovalent heterocyclic group in the substituent that the group represented by Ar ^Y1 may have is preferably monocyclic or bicyclic to hexacyclic because the luminous efficiency of the light emitting device of the present disclosure is superior. is a group obtained by removing one hydrogen atom directly bonded to a ring-constituting atom from a heterocyclic compound of the formula, more preferably a monocyclic, bicyclic or tricyclic heterocyclic compound, a group in which one hydrogen atom directly bonded to a ring-constituting atom is removed, more preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, phenoxazine, phenothiazine, 9 ,10-dihydroacridine or 5,10-dihydrophenazine with one hydrogen atom directly bonded to a ring-constituting atom (preferably a carbon atom or a nitrogen atom) removed, particularly preferably pyridine or diazabenzene , triazine, carbazole, dibenzofuran, dibenzothiophene, phenoxazine or phenothiazine, with one hydrogen atom directly bonded to a ring-constituting atom (preferably a carbon atom or a nitrogen atom) removed, and these groups are further It may have a substituent.
In the substituted amino group in the substituent that may be possessed by the group represented by Ar ^Y1 , the substituent possessed by the amino group is preferably an aryl group or a monovalent heterocyclic group, more preferably an aryl group. The group may further have a substituent. Examples and preferred ranges of the aryl group and the monovalent heterocyclic group in the substituent of the amino group are the aryl group and the monovalent heterocyclic group in the substituent that the group represented by Ar ^Y1 may have. is the same as the example and preferred range of

The substituent that the group represented by Ar ^Y1 may further have preferably has an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, monovalent heterocyclic group, substituted amino group or fluorine atom, more preferably alkyl group, cycloalkyl group, aryl group, monovalent heterocyclic group or substituted amino group, still more preferably alkyl group, a cycloalkyl group or an aryl group, particularly preferably an alkyl group or a cycloalkyl group. These groups may further have a substituent, but preferably have no further substituent. .
Examples and preferred ranges of the aryl group, monovalent heterocyclic group and substituted amino group in the substituent that the group represented by Ar Y1 may further have are ^{Ar Y1} are the same as the examples and preferred ranges of the aryl group, monovalent heterocyclic group and substituted amino group in the substituents that the group may have.

The structural unit represented by formula (Y) is preferably a structural unit represented by formula (Y-1) or formula (Y-2), since the luminous efficiency of the light-emitting device of the present disclosure is superior.

[In the formula,
R ^Y1 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group or a fluorine atom, and these groups are substituents may have When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. A plurality of R ^Y1 may be the same or different, and may be bonded to each other to form a ring together with the carbon atoms to which they are bonded.
X ^Y1 represents a group represented by -C(R ^Y2 ) ₂ -, -C(R ^Y2 )=C(R ^Y2 )- or -C(R ^Y2 ) ₂ -C(R ^Y2 ) ₂ -. R ^Y2 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group or a fluorine atom, and these groups are substituents may have When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. A plurality of ^RY2 may be the same or different, and may be bonded to each other to form a ring together with the carbon atoms to which they are bonded. ]

R ^Y1 is preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, more preferably a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group. more preferably a hydrogen atom or an alkyl group, and these groups may have a substituent.

In formula (Y-1), at least one of R ^{1 Y1} (preferably at least two of R ^{1 Y1} ) is preferably an alkyl group or a cycloalkyl group because the luminous efficiency of the light-emitting device of the present disclosure is superior. , an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group or a fluorine atom, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic ring or a substituted amino group, more preferably an alkyl group, a cycloalkyl group or an aryl group, particularly preferably an alkyl group, and these groups may have a substituent.

R ^Y2 is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, since the light-emitting device of the present disclosure has superior luminous efficiency; More preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, still more preferably an alkyl group, a cycloalkyl group or an aryl group, these groups having a substituent good too.

Examples and preferred ranges of ^the aryl group, monovalent heterocyclic group and substituted amino group for R ^Y1 and R ^Y2 are, respectively, the aryl group and the monovalent It is the same as the examples and preferred ranges of the heterocyclic group and the substituted amino group.
Examples and preferred ranges of substituents that R ^Y1 and R ^Y2 may have are the same as examples and preferred ranges of substituents that the group represented by Ar ^Y1 may have.

X ^Y1 is preferably a group represented by -C(R ^Y2 ) ₂ - or -C(R ^Y2 ) ₂ -C(R ^Y2 ) ₂ -, since the luminous efficiency of the light emitting device of the present disclosure is superior. and more preferably a group represented by -C(R ^Y2 ) ₂ -.

Examples of the structural unit represented by the formula (Y) include a structural unit composed of an arylene group represented by the formula (Y-101)-the formula (Y-141), a structural unit represented by the formula (Y-201)-the formula (Y- 209), at least one arylene group and at least one divalent heterocyclic ring represented by formulas (Y-301)-(Y-306) A structural unit composed of a divalent group directly bonded to a group is exemplified.

- Structural units a ^X1 and a ^X2 represented by formula (X) are usually integers of 0 to 10, and are preferably integers of 0 to 5 because the luminous efficiency of the light emitting device of the present disclosure is superior, It is more preferably an integer of 0 to 3, still more preferably an integer of 0 to 2, and particularly preferably 0 or 1.

R ^X1 , R ^X2 and R ^X3 are preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group or It is a monovalent heterocyclic group, more preferably an aryl group, and these groups may have a substituent.
Examples and preferred ranges of the aryl group and the monovalent heterocyclic group in R ^X1 , R ^X2 and R ^X3 are, respectively, the aryl group and the monovalent heterocyclic group in the substituent that the group represented by Ar ^Y1 may have. It is the same as the example and preferred range of the cyclic group.

Ar ^X1 , Ar ^X2 , Ar ^X3 and Ar ^X4 are preferably arylene groups optionally having substituents, since the light-emitting device of the present disclosure has superior luminous efficiency.
Examples and preferred ranges of the arylene group and divalent heterocyclic group for Ar ^X1 , Ar ^X2 , Ar ^X3 and Ar ^X4 are the same as the examples and preferred ranges of the arylene group and divalent heterocyclic group for Ar ^Y1 respectively. be.
Examples and preferred arylene groups and divalent heterocyclic groups in the divalent group in which at least one arylene group and at least one divalent heterocyclic group represented by Ar ^X2 and Ar ^X4 are directly bonded The ranges are the same as the examples and preferred ranges of the arylene group and the divalent heterocyclic group in Ar ^Y1 , respectively.
The divalent group in which at least one arylene group and at least one divalent heterocyclic group in Ar ^X2 and Ar ^X4 are directly bonded includes at least one arylene group and at least one divalent heterocyclic group in Ar ^Y1 . Examples thereof include the same divalent groups to which a valent heterocyclic group is directly bonded.

Examples and preferred ranges of the substituents that the groups represented by Ar ^X1 to Ar ^X4 and R ^X1 to R ^X3 may have are the examples and preferred ranges of the substituents that the group represented by Ar ^Y1 may have. Same as range.

Examples of structural units represented by formula (X) include structural units represented by the following formulas.

Examples of the first polymer compound include polymer compounds HP-1 to HP-3.

[In the table, p, q and r indicate the molar ratio (mol %) of each structural unit. p+q+r=100 and 100≧p+q≧70. Other structural units mean structural units other than the structural units represented by the formula (Y) and the structural units represented by the formula (X). ]

The first polymer compound may be a block copolymer, a random copolymer, an alternating copolymer, or a graft copolymer. It is preferably a copolymer obtained by copolymerizing monomers.
The polystyrene equivalent number average molecular weight of the first polymer compound is preferably 5×10 ³ to 1×10 ⁶ , more preferably 1×10 ⁴ to 5×10 ⁵ , still more preferably 2×10 ⁴ to 2×10 ⁵ . The polystyrene equivalent weight average molecular weight of the first polymer compound is preferably 1×10 ⁴ to 2×10 ⁶ , more preferably 2×10 ⁴ to 1×10 ⁶ , still more preferably 5×10 ⁴ to 5×10 ⁵ .

(Method for producing first polymer compound)
The first polymer compound can be produced using a known polymerization method described in Chemical Review (Chem. Rev.), Vol. 109, pp. 897-1091 (2009), Suzuki reaction, Yamamoto , Buchwald reaction, Stille reaction, Negishi reaction, Kumada reaction, and other coupling reactions using a transition metal catalyst.
In the above polymerization method, the method of charging the monomers includes a method of charging the entire amount of the monomers into the reaction system at once, a method of charging a part of the monomers and reacting them, and then charging the remaining monomers all at once. Examples thereof include a method of continuously or dividedly charging, a method of continuously or dividingly charging a monomer, and the like.
Examples of transition metal catalysts include palladium catalysts and nickel catalysts.
The post-treatment of the polymerization reaction is performed by a known method, for example, a method of removing water-soluble impurities by liquid separation, adding the reaction solution after the polymerization reaction to a lower alcohol such as methanol, filtering the deposited precipitate, and drying it. method, etc., is performed singly or in combination. When the purity of the first polymer compound is low, it can be purified by ordinary methods such as recrystallization, reprecipitation, continuous extraction using a Soxhlet extractor, and column chromatography.

[First composition]
The first layer may further contain at least one selected from the group consisting of hole-transporting materials, hole-injecting materials, electron-transporting materials, electron-injecting materials, light-emitting materials and antioxidants.
The first layer comprises a compound (B), a compound (A), a first compound, a hole-transporting material, a hole-injecting material, an electron-transporting material, an electron-injecting material, a light-emitting material, and an antioxidant. It may be a layer containing a composition (hereinafter also referred to as "first composition") containing at least one selected from. However, in the first composition, the hole-transporting material, the hole-injecting material, the electron-transporting material, the electron-injecting material, and the light-emitting material are different from the compound (B). In the first composition, the hole-transporting material, hole-injecting material, electron-transporting material, electron-injecting material and light-emitting material are different from compound (A).
The first composition contains the compound (B), the compound (A), the first compound, the hole-transporting material, the hole-injecting material, the electron-transporting material, the electron-injecting material, the light-emitting material, and the antioxidant, respectively. , may be contained singly, or two or more kinds thereof may be contained.
In the first composition, the compound (B), the compound (A), the first compound, the hole-transporting material, the hole-injecting material, the electron-transporting material, the electron-injecting material, the light-emitting material, and the antioxidant The amount may be within a range in which the function as the first composition is exhibited. In the first composition, the compound (B), the compound (A), the first compound, the hole-transporting material, the hole-injecting material, the electron-transporting material, the electron-injecting material, the light-emitting material, and the antioxidant The amount may be, for example, 1 to 100% by mass, 10 to 100% by mass, or 30 to 100% by mass based on the total amount of the first composition, more preferably It may be 50 to 100% by mass, 70 to 100% by mass, or 90 to 100% by mass.

(Hole transport material)
Hole-transporting materials are classified into low-molecular-weight compounds and high-molecular-weight compounds. The hole-transporting material may have a cross-linking group.
Examples of low-molecular-weight compounds include triphenylamine and its derivatives, N,N'-di-1-naphthyl-N,N'-diphenylbenzidine (α-NPD), and N,N'-diphenyl-N, aromatic amine compounds such as N'-di(m-tolyl)benzidine (TPD);
Polymer compounds include, for example, polyvinylcarbazole and derivatives thereof; polyarylenes and derivatives thereof having aromatic amine structures in side chains or main chains. The polymer compound may be a compound having electron-accepting moieties such as fullerene, tetrafluorotetracyanoquinodimethane, tetracyanoethylene and trinitrofluorenone bound thereto.
When the first composition contains a hole-transporting material, the content of the hole-transporting material is usually 1 when the total content of the compound (B) and the compound (A) is 100 parts by mass. ~10000 parts by mass.
The hole transport materials may be used singly or in combination of two or more.

(Electron transport material)
Electron transport materials are classified into low-molecular-weight compounds and high-molecular-weight compounds. The electron transport material may have a cross-linking group.
Examples of low-molecular-weight compounds include metal complexes having 8-hydroxyquinoline as a ligand, oxadiazole, anthraquinodimethane, benzoquinone, naphthoquinone, anthraquinone, tetracyanoanthraquinodimethane, fluorenone, diphenyldicyanoethylene and diphenoquinone. , as well as derivatives thereof.
Polymer compounds include, for example, polyphenylene, polyfluorene, and derivatives thereof. The polymeric compounds may be doped with metals.
When the first composition contains an electron-transporting material, the content of the electron-transporting material is usually 1 to 10,000 parts when the total content of the compound (B) and the compound (A) is 100 parts by mass. part by mass.
The electron transport materials may be used singly or in combination of two or more.

(Hole injection material and electron injection material)
Hole-injecting materials and electron-injecting materials are classified into low-molecular-weight compounds and high-molecular-weight compounds, respectively. The hole-injecting material and the electron-injecting material may have cross-linking groups.
Examples of low-molecular compounds include metal phthalocyanines such as copper phthalocyanine; carbon; metal oxides such as molybdenum and tungsten; and metal fluorides such as lithium fluoride, sodium fluoride, cesium fluoride and potassium fluoride.
Polymer compounds include, for example, polyaniline, polythiophene, polypyrrole, polyphenylene vinylene, polythienylene vinylene, polyquinoline and polyquinoxaline, and derivatives thereof; conductive polymers such as polymers containing an aromatic amine structure in the main chain or side chain; and a flexible polymer.
When the first composition contains a hole-injection material and/or an electron-injection material, the content of the hole-injection material and the electron-injection material is the total content of the compound (B) and the compound (A), respectively. When the amount is 100 parts by mass, it is usually 1 to 10000 parts by mass.
Each of the hole injection material and the electron injection material may be used alone or in combination of two or more.

- Ion doping The hole-injecting material or the electron-injecting material may be doped with ions. For example, if the hole-injecting material or electron-injecting material comprises a conductive polymer, the electrical conductivity of the conductive polymer is preferably between 1×10 ⁻⁵ S/cm and 1×10 ³ S/cm. The conductive polymer can be doped with an appropriate amount of ions in order to set the electrical conductivity of the conductive polymer within this range.
The type of ions to be doped into the hole injection material or the electron injection material is, for example, an anion for the hole injection material, and a cation for the electron injection material. Anions include, for example, polystyrene sulfonate, alkylbenzene sulfonate, and camphor sulfonate. Cations include, for example, lithium ion, sodium ion, potassium ion and tetrabutylammonium ion.
Ions for doping may be used alone or in combination of two or more.

(Luminous material)
Light-emitting materials are classified into low-molecular-weight compounds and high-molecular-weight compounds. The luminescent material may have a cross-linking group.
Examples of low-molecular-weight compounds include naphthalene and its derivatives, anthracene and its derivatives, perylene and its derivatives, and phosphorescent compounds having iridium, platinum, or europium as a central metal.
Examples of polymer compounds include polymer compounds containing structural units represented by the above formula (Y) and/or structural units represented by the above formula (X).
When the first composition contains a luminescent material, the content of the luminescent material is usually 1 to 10000 parts by mass when the total content of the compound (B) and the compound (A) is 100 parts by mass. is.
A luminescent material may be used individually by 1 type, or may use 2 or more types together.

(Antioxidant)
The antioxidant is soluble in the same solvent as the compound (B) and compound (A), and may be any compound that does not inhibit light emission and charge transport. mentioned.
When the first composition contains an antioxidant, the content of the antioxidant is usually 0.00001 when the total content of the compound (B) and the compound (A) is 100 parts by mass. ~10 parts by mass.
Antioxidants may be used alone or in combination of two or more.

[First ink]
The first layer can be formed using, for example, a composition containing compound (B), compound (A), and a solvent (hereinafter also referred to as “first ink”).
The first ink may contain one type of compound (B), compound (A) and solvent, respectively, or may contain two or more types.
The first ink can be applied, for example, by a spin coating method, a casting method, a micro gravure coating method, a gravure coating method, a bar coating method, a roll coating method, a wire bar coating method, a dip coating method, a spray coating method, a screen printing method, a flexographic It can be suitably used for producing a light emitting device using a wet method such as a printing method, an offset printing method, an inkjet printing method, a capillary coating method, a nozzle coating method and the like.
The viscosity of the first ink may be adjusted according to the type of wet method. The viscosity of the first ink is preferably 1 at 25° C. because, for example, clogging and flight deflection during ejection are unlikely to occur when the solution is applied to a printing method such as an inkjet printing method that passes through an ejection device. ~20 mPa·s.
The solvent contained in the first ink is preferably a solvent capable of dissolving or uniformly dispersing the solid content in the ink. Examples of the solvent contained in the first ink include chlorine-based solvents, ether-based solvents, aromatic hydrocarbon-based solvents, aliphatic hydrocarbon-based solvents, ketone-based solvents, ester-based solvents, polyhydric alcohol-based solvents, alcohol solvent, sulfoxide solvent, amide solvent and water.
In the first ink, the content of the solvent is usually 1000 to 10000000 parts by mass when the total content of compound (B) and compound (A) is 100 parts by mass.
A solvent may be used individually by 1 type, or may use 2 or more types together.

The first ink may further contain at least one selected from the group consisting of a first compound, a hole-transporting material, a hole-injecting material, an electron-transporting material, an electron-injecting material, a light-emitting material, and an antioxidant. good.
The first ink may contain one type of hole transport material, hole injection material, electron transport material, electron injection material, light emitting material, and antioxidant, respectively, or contain two or more types. may have been
Examples and preferred ranges of the hole-transporting material, the electron-transporting material, the hole-injecting material, the electron-injecting material, the light-emitting material, and the antioxidant, which the first ink may further comprise, are described in the first composition, respectively. are the same as the examples and preferred ranges of the hole transport material, electron transport material, hole injection material, electron injection material, light emitting material and antioxidant contained in .
The contents of the hole-transporting material, the electron-transporting material, the hole-injecting material, the electron-injecting material, and the light-emitting material, which the first ink may further contain, are each the total of the compound (B) and the compound (A) When the content of is 100 parts by mass, it is usually 1 to 10000 parts by mass. The content of the antioxidant that the first ink may further contain is usually 0.00001 to 10 parts by mass when the total content of the compound (B) and the compound (A) is 100 parts by mass. is. The content of the first compound that the first ink may further contain is, for example, 0 when the total content of the compound (A), the compound (B) and the first compound is 100 parts by mass. .1 to 99.99 parts by mass, preferably 1 to 99.9 parts by mass, more preferably 10 to 99.5 parts by mass, since the luminous efficiency of the light emitting device of the present disclosure is more excellent, and further It is preferably 30 to 99 parts by mass, particularly preferably 50 to 95 parts by mass, particularly preferably 70 to 90 parts by mass.

<Second Layer and Third Layer>
In the light emitting device of the present disclosure, the second layer and the third layer are a structural unit represented by formula (ET-1), a structural unit represented by formula (ET-2), and a structural unit represented by formula (X). at least one configuration selected from the group consisting of a structural unit represented by the formula (Y), a structural unit represented by the formula (Z), and a structural unit represented by the formula (Z′) It is a layer formed using a polymer compound containing units (hereinafter also referred to as a “second polymer compound”).
As used herein, "a layer formed using" means that a layer is formed using a material for forming the layer. The layer may contain, for example, the material for forming the layer as it is, or the material for forming the layer may be insolubilized (for example, the material for forming the layer may be intramolecular, cross-linked between molecules or both).
Taking the second layer formed using the second polymer compound as an example, the second layer may contain the second polymer compound as it is, or may contain the second polymer compound as it is. The compound may be contained in an insolubilized state (for example, the second polymer compound is crosslinked intramolecularly, intermolecularly, or both).

The second layer may contain only one type of the second polymer compound, or may contain two or more types. Also, the second layer may be formed using only one type of the second polymer compound, or may be formed using two or more types of the second polymer compound.
In the second layer, the luminous efficiency of the light emitting element of the present disclosure is higher, so the structural unit represented by formula (X), the structural unit represented by formula (Y), and the structure represented by formula (Z) The layer is preferably formed using a polymer compound containing at least one structural unit selected from the group consisting of units and structural units represented by formula (Z′).
The third layer may contain only one type of the second polymer compound, or may contain two or more types thereof. Also, the third layer may be formed using only one type of the second polymer compound, or may be formed using two or more types of the second polymer compound.
The third layer is selected from the group consisting of structural units represented by formula (ET-1) and structural units represented by formula (ET-2), because the light emitting device of the present disclosure has higher luminous efficiency. It is preferable that the layer is formed using a polymer compound containing at least one kind of constitutional unit.

The content of the component derived from the second polymer compound (e.g., the second polymer compound, the crosslinked product of the second polymer compound, etc.) in the second layer is not particularly limited. It may be any range as long as the function as the second layer is exhibited. The content of the component derived from the second polymer compound in the second layer may be, for example, 1 to 100% by mass based on the total amount of the second layer. Since the efficiency is better, it is preferably 10 to 100% by mass, more preferably 30 to 100% by mass, still more preferably 50 to 100% by mass, particularly preferably 70 to 100% by mass, especially It is preferably 90 to 100% by mass.
The content of the component derived from the second polymer compound (e.g., the second polymer compound, the crosslinked product of the second polymer compound, etc.) in the third layer is not particularly limited. It may be any range as long as the function as the layer 3 is exhibited. The content of the component derived from the second polymer compound in the third layer may be, for example, 1 to 100% by mass based on the total amount of the third layer. Since the efficiency is better, it is preferably 10 to 100% by mass, more preferably 30 to 100% by mass, still more preferably 50 to 100% by mass, particularly preferably 70 to 100% by mass, especially It is preferably 90 to 100% by mass.

(Structural Unit Represented by Formula (Z))
n is usually an integer of 1 to 10, preferably an integer of 1 to 7, more preferably an integer of 1 to 4, and still more preferably 1, because the luminous efficiency of the light-emitting device of the present disclosure is superior. or 2, particularly preferably 2.
nA is usually an integer of 0 to 10, and preferably an integer of 0 to 7, more preferably an integer of 0 to 4, still more preferably 0 An integer from ~2.

The hydrocarbon group for Ar ^Z includes an optionally substituted aromatic hydrocarbon group and an optionally substituted aliphatic hydrocarbon group. The hydrocarbon group for Ar ^Z includes groups in which multiple of these groups are bonded.
The aliphatic hydrocarbon group for Ar ^Z includes a group obtained by removing n hydrogen atoms from an alkylene group or a cycloalkylene group, preferably a group obtained by removing n hydrogen atoms from an alkylene group. may have a substituent.
The aromatic hydrocarbon group for Ar ^{2 Z} includes a group obtained by removing n hydrogen atoms from an arylene group, and this group may have a substituent. Examples and preferred ranges of the arylene group include examples and preferred ranges of the arylene group in Ar ^Y1 .
The heterocyclic group for Ar 2 ^Z includes a group obtained by removing n hydrogen atoms from a divalent heterocyclic group, and this group may have a substituent. Examples and preferred ranges of the divalent heterocyclic group include examples and preferred ranges of the divalent heterocyclic group in Ar ^Y1 .
Examples and preferred ranges of the hydrocarbon group and the heterocyclic group in the group in which at least one hydrocarbon group and at least one heterocyclic group in Ar ^Z are directly bonded are the hydrocarbon group and the heterocyclic group in Ar ^Z , respectively. It is the same as the example and preferred range of the cyclic group.
The group in which at least one hydrocarbon group and at least one heterocyclic group are directly bonded in Ar ^Z includes, for example, at least one arylene group and at least one divalent heterocyclic group in Ar ^Y1 . A group obtained by removing n hydrogen atoms from the group to which is directly bonded can be mentioned.
Ar ^Z is preferably a hydrocarbon group or a heterocyclic group, more preferably a hydrocarbon group, and still more preferably an aromatic hydrocarbon group, since the light-emitting element of the present disclosure has superior luminous efficiency. and these groups may have a substituent.

Examples and preferred ranges of the arylene group represented by ^LA include examples and preferred ranges of the arylene group represented by Ar ^Y1 . The arylene group represented by ^LA is preferably a phenylene group or a fluorenediyl group, and these groups may have a substituent, since the luminous efficiency of the light-emitting device of the present disclosure is superior.
Examples and preferred ranges of the divalent heterocyclic group represented by ^LA are the same as examples and preferred ranges of the divalent heterocyclic group represented by Ar ^Y1 .
L ^A is preferably an arylene group or an alkylene group, more preferably a phenylene group, since it facilitates the synthesis of the second polymer compound and the luminous efficiency of the light-emitting device of the present disclosure is superior. It is a fluorenediyl group or an alkylene group, and these groups may have a substituent.

R' is preferably an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and these groups may have a substituent.
Examples and preferred ranges of the aryl group and monovalent heterocyclic group in R ^′ are respectively examples and Same as the preferred range.

Examples and preferred ranges of substituents that groups represented by Ar ^Z , ^LA and R′ may have are the same as examples and preferred ranges of substituents that groups represented by Ar ^Y1 may have. is.
The cross-linking group for X is at least one cross-linking group selected from cross-linking group A (i.e., at least one cross-linking group selected from the cross-linking groups represented by formulas (XL-1) to (XL-19), more preferably formulas (XL-1) to (XL-4), A cross-linking group represented by Formula (XL-7) ~ Formula (XL-10) or Formula (XL-14) ~ Formula (XL-19), more preferably Formula (XL-1), Formula (XL -3), formula (XL-7), formula (XL-9), formula (XL-10) or a bridging group represented by formula (XL-16) to formula (XL-19), particularly preferably , a cross-linking group represented by formula (XL-1) or formula (XL-16) to formula (XL-19), particularly preferably represented by formula (XL-1) or formula (XL-17) is a cross-linking group.

(Structural Unit Represented by Formula (Z′))
mA is usually an integer of 0 to 10, and preferably an integer of 0 to 7, more preferably an integer of 0 to 4, and still more preferably 0, because the luminous efficiency of the light emitting device of the present disclosure is superior. It is an integer of ∼2, particularly preferably 0 or 1, particularly preferably 0.
m is usually an integer of 0 to 10, preferably an integer of 0 to 7, more preferably an integer of 0 to 4, and still more preferably 0, because the luminous efficiency of the light emitting device of the present disclosure is superior. It is an integer of up to 2, and particularly preferably 0.
c is usually an integer of 0 to 10, and preferably an integer of 0 to 5, because it facilitates the synthesis of the second polymer compound and the luminous efficiency of the light emitting device of the present disclosure is better, It is more preferably an integer of 0 to 2, still more preferably 0 or 1, and particularly preferably 0.

Examples and preferred ranges of the hydrocarbon group and heterocyclic group for Ar ⁵ are the same as examples and preferred ranges of the hydrocarbon group and heterocyclic group for Ar ^Z , respectively.
Examples and preferred ranges of the group in which at least one hydrocarbon group and at least one heterocyclic group are directly bonded for Ar ⁵ include at least one hydrocarbon group and at least one heterocyclic group for Ar ^Z. is the same as the example and preferred range of the group to which is directly bonded.
Ar ⁵ is preferably a hydrocarbon group or a heterocyclic group, more preferably a hydrocarbon group, and still more preferably an aromatic hydrocarbon group, since the light-emitting device of the present disclosure has superior luminous efficiency. and these groups may have a substituent.

Ar ⁴ and Ar ⁶ are preferably an arylene group optionally having a substituent, since the luminous efficiency of the light-emitting device of the present disclosure is more excellent.
Examples and preferred ranges of arylene groups for Ar ⁴ and Ar ⁶ are the same as examples and preferred ranges of arylene groups for Ar ^X1 , Ar ^X2 , Ar ^X3 and Ar ^X4 .
Examples and preferred ranges of the divalent heterocyclic group for Ar ⁴ and Ar ⁶ are the same as examples and preferred ranges for the divalent heterocyclic group for Ar ^X1 , Ar ^X2 , Ar ^X3 and Ar ^X4 .

Examples and preferred ranges of substituents that the groups represented by Ar ⁴ to Ar ⁶ may have are the same as examples and preferred ranges of substituents that the groups represented by Ar ^Y1 may have. .

The examples and preferred ranges of K ^A are the same as the examples and preferred ranges of L ^A.
The examples and preferred ranges of R'' are the same as the examples and preferred ranges of R'.

Examples and preferred ranges of the cross-linking group for X' are the same as those of the cross-linking group represented by X.
Examples and preferred ranges of the aryl group and monovalent heterocyclic group for X′ are the examples and preferred ranges of the aryl group and monovalent heterocyclic group for R ^X1 , R ^X2 and R ^X3 , respectively. are the same.
X' is preferably a bridging group, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably a bridging group, an aryl group or a monovalent heterocyclic group, still more preferably is a bridging group or an aryl group, and these groups may have a substituent.
Examples and preferred ranges of substituents that the group represented by X' may have are the same as examples and preferred ranges of substituents that the group represented by Ar ^Y1 may have.

Examples of structural units represented by formula (Z) and structural units represented by formula (Z′) include structural units represented by the following formulas.

(Structural Unit Represented by Formula (ET-1))

nE1 is preferably an integer of 1-4, more preferably 1 or 2.

The aromatic hydrocarbon group represented by Ar ^E1 preferably comprises a ring composed of monocyclic or bicyclic to hexacyclic aromatic hydrocarbons, because the light-emitting device of the present disclosure has superior luminous efficiency. A group excluding one or more hydrogen atoms directly bonded to the atoms that form the ring, more preferably a monocyclic, bicyclic or tricyclic aromatic hydrocarbon hydrogen directly bonded to the atoms that constitute the ring a group in which one or more atoms are removed, more preferably a group in which one or more hydrogen atoms directly bonded to ring-constituting atoms are removed from benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene or fluorene, Particularly preferred is a group obtained by removing one or more hydrogen atoms directly bonded to ring-constituting atoms from benzene, naphthalene, phenanthrene, dihydrophenanthrene or fluorene, and these groups may have a substituent. .
The heterocyclic group represented by Ar ^E1 is preferably a monocyclic or bicyclic to hexacyclic heterocyclic compound, since the luminous efficiency of the light emitting device of the present disclosure is superior, and the atoms constituting the ring are preferably A group excluding one or more hydrogen atoms directly bonded to, more preferably, from a monocyclic, bicyclic or tricyclic heterocyclic compound, a hydrogen atom 1 directly bonded to an atom constituting a ring more preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, phenoxazine, phenothiazine, 9,10-dihydroacridine or 5,10-dihydro A group obtained by removing one or more hydrogen atoms directly bonded to a ring-constituting atom (preferably a carbon atom or a nitrogen atom, more preferably a carbon atom) from phenazine, and particularly preferably pyridine, diazabenzene, triazine, or carbazole. , dibenzofuran, dibenzothiophene, phenoxazine or phenothiazine, from which one or more hydrogen atoms directly bonded to atoms (preferably carbon atoms or nitrogen atoms, more preferably carbon atoms) constituting the ring are removed, and these A group may have a substituent.
Ar ^E1 is preferably a group obtained by removing one or more hydrogen atoms directly bonded to ring-constituting atoms from benzene, naphthalene, fluorene, phenanthrene or carbazole, and this group is a substituent other than R ^E1 . may have.

Substituents other than R ^E1 that Ar ^E1 may have include a halogen atom, a cyano group, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, an alkoxy group, a cycloalkoxy group, and an aryloxy group. groups, amino groups, substituted amino groups, alkenyl groups, cycloalkenyl groups, alkynyl groups, cycloalkynyl groups, carboxyl groups and groups represented by formula (ES-3).

—O—(C _n′ H _2n′ O) _nx —C _m′ H _2m′+1 (ES-3)
[In the formula, n', m' and nx each independently represent an integer of 1 or more. ]

nE3 is usually an integer of 0-10, preferably an integer of 0-8, more preferably an integer of 0-2.
aE1 is usually an integer of 1-10, preferably an integer of 1-5, more preferably 1 or 2.
bE1 is usually an integer of 0-10, preferably an integer of 0-4, more preferably 0 or 1.
mE1 is generally an integer of 1 to 5, preferably 1 or 2, more preferably 1.

When R ^E3 is —OR ^E3 ', the group represented by formula (ES-1) is the group represented below.
-OR ^E3 '-{(Q ^E1 ) _nE3 -Y ^E1 (M ^E1 ) _aE1 (Z ^E1 ) _bE1 } _mE1

R ^E3 is preferably a hydrocarbon group or a heterocyclic group, more preferably an aromatic hydrocarbon group or an aromatic heterocyclic group, and still more preferably an aromatic hydrocarbon group. good too.
Examples of the substituent that R ^E3 may have include an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group and a group represented by the formula (ES-3). Groups represented by 3) are preferred, and these groups may further have a substituent.

Q ^E1 is preferably an alkylene group, an arylene group or an oxygen atom, more preferably an alkylene group or an oxygen atom, and these groups may have a substituent.

Y ^E1 is preferably -CO ₂ ^- , -SO ₂ ^- or -PO ₃ ^2- , more preferably -CO ₂ ^- .
Alkali metal cations represented by M ^E1 include, for example, Li ⁺ , Na ⁺ , K ⁺ , Rb ⁺ and Cs ⁺ , preferably K ⁺ , Rb ⁺ or Cs ⁺ , more preferably Cs ⁺ .
Alkaline earth metal cations represented by M ^E1 include, for example ^, Be ²⁺ , Mg ²⁺ , Ca 2+ , Sr ²⁺ , Ba ²⁺ , Mg ²⁺ , Ca ²⁺ , Sr ²⁺ Or Ba ²⁺ is preferred, and Ba ²⁺ is more preferred.
M ^E1 is preferably an alkali metal cation or an alkaline earth metal cation, more preferably an alkali metal cation.
Z ^E1 includes F ⁻ , Cl ⁻ , Br ⁻ , I ⁻ , OH ⁻ , B(R ^E4 ) ₄ ⁻ , R ^E4 SO ₃ ⁻ , R ^E4 C
OO ^- or NO ₃ ^- is preferred, preferably F ^- , Cl ^- , Br ^- , I ^- , OH ^- , R ^E4 SO ₃ ^- or R ^E4 COO ^- . R ^E4 is preferably an alkyl group.

Examples of the group represented by formula (ES-1) include groups represented by the following formulas.

［式中、Ｍ⁺は、Ｌｉ⁺、Ｎａ⁺、Ｋ⁺、Ｃｓ⁺又はＮ（ＣＨ₃）₄ ⁺を表す。Ｍ⁺が複数存在する場合、それらは同一でも異なっていてもよい。］

[In the formula, M ⁺ represents Li ⁺ , Na ⁺ , K ⁺ , Cs ⁺ or N(CH ₃ ) ₄ ⁺ . When multiple M ⁺ are present, they may be the same or different. ]

(Structural unit represented by formula (ET-2))

nE2 is generally an integer of 1-4, preferably 1 or 2.

Examples and preferred ranges of the aromatic hydrocarbon group represented by Ar ^E2 are the same as examples and preferred ranges of the aromatic hydrocarbon group represented by Ar ^E1 .
Examples and preferred ranges of the heterocyclic group represented by Ar ^E2 are the same as examples and preferred ranges of the divalent heterocyclic group represented by Ar ^E1 .
Examples and preferred ranges for Ar ^E2 are the same as those for Ar ^E1 .
The substituents other than R ^E2 that Ar ^E2 may have are the same as the substituents other than R ^E1 that Ar ^E1 may have.

nE4 is generally an integer of 0-10, preferably an integer of 0-8, more preferably an integer of 0-2.
aE2 is usually an integer of 1-10, preferably an integer of 1-5, more preferably 1 or 2.
bE2 is usually an integer of 0-10, preferably an integer of 0-4, more preferably 0 or 1.
mE2 is generally an integer of 1 to 5, preferably 1 or 2, more preferably 1.

When R ^E5 is —OR ^E5 ', the group represented by formula (ES-2) is the group represented below.
-OR ^E5 '-{(Q ^E1 ) _nE3 -Y ^E1 (M ^E1 ) _aE1 (Z ^E1 ) _bE1 } _mE1

R ^E5 is preferably a hydrocarbon group or a heterocyclic group, more preferably an aromatic hydrocarbon group or an aromatic heterocyclic group, and still more preferably an aromatic hydrocarbon group. good too.

Examples of the substituent that R ^E5 may have include an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, and a group represented by the formula (ES-3). Groups represented by 3) are preferred, and these groups may further have a substituent.

Q ^E2 is preferably an alkylene group, an arylene group or an oxygen atom, more preferably an alkylene group or an oxygen atom, and these groups may have a substituent.

Y ^E2 is preferably -C ⁺ R ^E6 ₂ , -N ⁺ R ^E6 ₃ , -P ⁺ R ^E6 ₃ or S ⁺ R ^E6 ₂ , more preferably -N ⁺ R ^E6 ₃ . R ^E6 is preferably a hydrogen atom, an alkyl group or an aryl group, more preferably a hydrogen atom or an alkyl group, and these groups may have a substituent.
M ^E2 is preferably F ⁻ , Cl ⁻ , Br ⁻ , I ⁻ , B(R ^E7 ) ₄ ⁻ , R ^E7 SO ₃ ⁻ , R ^E7 COO ⁻ , BF ₄ ⁻ or SbF ⁶ − , Br ⁻ , I ^- , B(R ^E7 ) ₄ ^- , R ^E7 COO ^- or SbF ^6- are more preferred. R ^E7 is preferably an optionally substituted alkyl group.
Alkali metal cations represented by Z ^E2 include, for example, Li ⁺ , Na ⁺ , K ⁺ , Rb ⁺ and Cs ⁺ , with Li ⁺ , Na ⁺ and K ⁺ being preferred.
Alkaline earth metal cations represented by Z ^E2 include, for example, Be ²⁺ , Mg ²⁺ , Ca ²⁺ , Sr ²⁺ and Ba ²⁺ , preferably Mg ²⁺ or Ca ²⁺ .
Z ^E2 is preferably an alkali metal cation.

Examples of the group represented by formula (ES-2) include groups represented by the following formulas.

［式中、Ｘ^-は、Ｆ^-、Ｃｌ^-、Ｂｒ^-、Ｉ^-、Ｂ（Ｃ₆Ｈ₅）₄ ^-、ＣＨ₃ＣＯＯ^-又はＣＦ₃ＳＯ₃ ^-を表す。Ｘ^-が複数存在する場合、それらは同一でも異なっていてもよい。］

[In the formula, X ^- represents F ^- , Cl ^- , Br ^- , I ^- , B(C ₆ H ₅ ) ₄ ^- , CH ₃ COO ^- or CF ₃ SO ₃ ^- . When multiple X ^- are present, they may be the same or different. ]

Examples of structural units represented by formula (ET-1) and structural units represented by formula (ET-2) include structural units represented by formulas (ET-31) to (ET-38). mentioned.

The structural unit represented by the formula (ET-1) contained in the second polymer compound, the structural unit represented by the formula (ET-2), the structural unit represented by the formula (X), the formula (Y ), at least one structural unit selected from the group consisting of structural units represented by the formula (Z) and structural units represented by the formula (Z′) has a function as a layer You can choose to play.
For example, when the second polymer compound is used in the layer (e.g., hole transport layer and hole injection layer) provided between the anode and the light-emitting layer, the second polymer compound is represented by formula (X) At least one selected from the group consisting of a structural unit represented by the formula (Y), a structural unit represented by the formula (Z) and a structural unit represented by the formula (Z') It is preferably a polymer compound containing structural units (hereinafter also referred to as “hole-injection-transport polymer compound”).
For example, when a second polymer compound is used in a layer (e.g., an electron-transporting layer and an electron-injecting layer) provided between the cathode and the light-emitting layer, the second polymer compound is represented by formula (ET-1) A polymer compound (hereinafter referred to as Also referred to as an “electron-injecting and transporting polymer compound”).

(Hole injection transport polymer compound)
The hole-injecting and transporting polymer compound is selected from the group consisting of structural units represented by the formula (X) and structural units represented by the formula (Y), since the light-emitting device of the present disclosure has superior luminous efficiency. A polymer compound containing at least one structural unit is preferred.

The hole-injecting and transporting polymer compound preferably contains a structural unit represented by the formula (Y), since the light-emitting device of the present disclosure has better luminous efficiency.
When the hole-injection-transport polymer compound contains a structural unit represented by formula (Y), the content of the structural unit represented by formula (Y) contained in the hole-injection-transport polymer compound is positive Any amount may be used as long as the function as a hole-injection transportable polymer compound can be exhibited. When the hole-injection-transport polymer compound contains a structural unit represented by formula (Y), the content of the structural unit represented by formula (Y) contained in the hole-injection-transport polymer compound is positive It is, for example, 0.1 to 100 mol % with respect to the total content of structural units contained in the hole-injection-transporting polymer compound, and is preferably 1 to 1 because the luminous efficiency of the light-emitting device of the present disclosure is more excellent. It is 100 mol %, more preferably 10 to 90 mol %, still more preferably 20 to 80 mol %, particularly preferably 30 to 70 mol %.
The structural unit represented by the formula (Y) may be contained alone or in combination of two or more in the hole-injecting and transporting polymer compound.

The hole-injection-transport polymer compound has excellent hole-transport properties and the light-emitting device of the present disclosure has superior luminous efficiency, so the structure represented by formula (X) It preferably contains units.
When the hole-injection-transport polymer compound contains a structural unit represented by formula (X), the content of the structural unit represented by formula (X) contained in the hole-injection-transport polymer compound is positive Any amount may be used as long as the function as a hole-injection transportable polymer compound can be exhibited. When the hole-injection-transport polymer compound contains a structural unit represented by formula (X), the content of the structural unit represented by formula (X) contained in the hole-injection-transport polymer compound is positive It is, for example, 0.1 to 100 mol % with respect to the total content of structural units contained in the hole-injection-transport polymer compound, and the hole-transport property of the hole-injection-transport polymer compound is excellent, and , preferably 1 to 100 mol%, more preferably 10 to 90 mol%, still more preferably 20 to 80 mol%, and particularly preferably 30 ~70 mol%.
The structural unit represented by the formula (X) may be contained alone or in combination of two or more in the hole-injecting and transporting polymer compound.

The hole-injection-transport polymer compound has an excellent hole-transport property, and the light-emitting device of the present disclosure has a further excellent luminous efficiency. Therefore, the structure represented by the formula (X) It preferably contains a unit and a structural unit represented by formula (Y).
When the hole-injection-transport polymer compound contains a structural unit represented by the formula (X) and a structural unit represented by the formula (Y), the formula (X) contained in the hole-injection-transport polymer compound The total content of the structural unit represented by the formula (Y) and the structural unit represented by the formula (Y) may be within a range in which the function of the hole-injecting and transporting polymer compound can be achieved. When the hole-injection-transport polymer compound contains a structural unit represented by the formula (X) and a structural unit represented by the formula (Y), the formula (X) contained in the hole-injection-transport polymer compound The total content of the structural units represented by the formula (Y) and the structural units represented by the formula (Y) is, for example, 0.1 with respect to the total content of the structural units contained in the hole-injecting and transporting polymer compound. It is preferably 1 to 100 mol %, more preferably 1 to 100 mol %, because the hole-transporting property of the hole-injecting and transporting polymer compound is excellent and the luminous efficiency of the light-emitting device of the present disclosure is further excellent. is 10 to 100 mol %, more preferably 30 to 100 mol %, still more preferably 50 to 100 mol %.

The hole-injecting and transporting polymer compound can form the light-emitting device of the present disclosure by a wet method, and facilitates lamination of layers in the production of the light-emitting device of the present disclosure. It is preferably a polymer compound containing at least one structural unit selected from the group consisting of structural units and structural units represented by formula (Z′). This polymer compound can be made into a crosslinked state (crosslinked polymer compound) by the method and conditions described later.
When the hole-injecting transport polymer compound contains the structural unit represented by the formula (Z), the content of the structural unit represented by the formula (Z) is such that the function as the hole-injecting transport polymer compound is It is acceptable as long as it is within the range where it can be played. When the hole-injection-transport polymer compound contains a structural unit represented by formula (Z), the content of the structural unit represented by formula (Z) is within the composition contained in the hole-injection-transport polymer compound. For example, it is 0.1 to 100 mol % with respect to the total content of the units, and the crosslinkability of the hole-injecting and transporting polymer compound is more excellent, and the luminous efficiency of the light-emitting device of the present disclosure is more excellent. Therefore, it is preferably 1 to 99 mol %, more preferably 2 to 90 mol %, still more preferably 3 to 70 mol %, particularly preferably 5 to 50 mol %.
When the hole-injection-transport polymer compound contains a structural unit represented by formula (Z′), the content of the structural unit represented by formula (Z′) is Any range is acceptable as long as the function can be achieved. When the hole-injecting transport polymer compound contains the structural unit represented by formula (Z′), the content of the structural unit represented by formula (Z′) is is, for example, 0.1 to 100 mol% with respect to the total content of the constituent units, the crosslinkability of the hole-injecting and transporting polymer compound is superior, and the luminous efficiency of the light-emitting device of the present disclosure is high. Since it is more excellent, it is preferably 1 to 99 mol%, more preferably 2 to 90 mol%, still more preferably 3 to 70 mol%, and particularly preferably 5 to 50 mol%.
When the hole-injecting and transporting polymer compound contains a structural unit represented by the formula (Z) and a structural unit represented by the formula (Z'), the structural unit represented by the formula (Z) and the structural unit represented by the formula (Z' ) may be within a range in which the function as a hole-injecting and transporting polymer compound can be exhibited. When the hole-injecting and transporting polymer compound contains at least one structural unit selected from the group consisting of structural units represented by the formula (Z) and structural units represented by the formula (Z′), the formula (Z ) and the structural unit represented by the formula (Z′) is relative to the total content of the structural units contained in the hole-injecting and transporting polymer compound, for example, 0.1 to 100 mol%, preferably 1 to 99 mol%, because the hole-injecting and transporting polymer compound has better crosslinkability and the luminous efficiency of the light-emitting device of the present disclosure is better, It is more preferably 2 to 90 mol %, still more preferably 3 to 70 mol %, particularly preferably 5 to 50 mol %.
The structural unit represented by the formula (Z) may be contained alone or in combination of two or more in the hole-injecting and transporting polymer compound. The structural unit represented by the formula (Z') may be contained alone or in combination of two or more in the hole-injecting and transporting polymer compound.

Examples of hole-injecting and transporting polymer compounds include polymer compounds P-1 to P-12 shown in Table 4. Here, "other" means a structural unit represented by formula (Z), a structural unit represented by formula (Z'), a structural unit represented by formula (X), and a structural unit represented by formula (Y). means a structural unit other than the structural unit

[In the table, p', q', r', s' and t' represent the molar ratio (mol%) of each structural unit. p'+q'+r'+s'+t'=100 and 70≤p'+q'+r'+s'≤100. ]

The hole-injecting and transporting polymer compound may be a block copolymer, a random copolymer, an alternating copolymer, or a graft copolymer. is preferably a copolymer obtained by copolymerizing the raw material monomers.
The example and preferred range of the polystyrene-equivalent number average molecular weight of the hole-injecting and transporting polymer compound are the same as the example and preferred range of the polystyrene-equivalent number average molecular weight of the first polymer compound. The example and preferred range of the polystyrene-equivalent weight average molecular weight of the hole-injecting and transporting polymer compound are the same as the example and preferred range of the polystyrene-equivalent weight average molecular weight of the first polymer compound.

(Method for producing hole-injection-transport polymer compound)
The hole-injecting and transporting polymer compound can be produced by the same method as the method for producing the first polymer compound.

(Electron injecting and transporting polymer compound)
Since the electron-injecting-transporting polymer compound has superior luminous efficiency of the light-emitting device of the present disclosure, the structural unit represented by the formula (ET-1), the structural unit represented by the formula (ET-2), and the formula ( Y) is preferably a polymer compound containing at least one structural unit selected from the group consisting of structural units represented by formula (ET-1) and formula (ET-2 ) is more preferably a polymer compound containing at least one structural unit selected from the group consisting of structural units represented by the formula (ET-1). It is even more preferable to have

When the electron-injecting-transporting polymer compound contains a structural unit represented by formula (ET-1), the content of the structural unit represented by formula (ET-1) is Any range is acceptable as long as the function can be achieved. When the electron-injecting-transporting polymer compound contains a structural unit represented by formula (ET-1), the content of the structural unit represented by formula (ET-1) is For example, it is 0.1 to 100 mol% with respect to the total content of the structural units, and is preferably 1 to 100 mol%, more preferably 1 to 100 mol%, because the luminous efficiency of the light emitting device of the present disclosure is superior. 10 to 100 mol%, more preferably 30 to 100 mol%, particularly preferably 50 to 100 mol%, particularly preferably 70 to 100 mol%, particularly preferably 90 to 100 mol% is.

When the electron-injecting-transporting polymer compound contains a structural unit represented by formula (ET-2), the content of the structural unit represented by formula (ET-2) is Any range is acceptable as long as the function can be achieved. When the electron-injecting and transporting polymer compound contains the structural unit represented by formula (ET-2), the content of the structural unit represented by formula (ET-2) is For example, it is 0.1 to 100 mol% with respect to the total content of the structural units, and is preferably 1 to 100 mol%, more preferably 1 to 100 mol%, because the luminous efficiency of the light emitting device of the present disclosure is superior. 10 to 100 mol%, more preferably 30 to 100 mol%, particularly preferably 50 to 100 mol%, particularly preferably 70 to 100 mol%, particularly preferably 90 to 100 mol% is.

When the electron-injecting and transporting polymer compound contains the structural unit represented by formula (Y), the content of the structural unit represented by formula (Y) is such that the function of the electron-injecting and transporting polymer compound is achieved. It is acceptable if it is within the range of When the electron-injecting and transporting polymer compound contains the structural unit represented by the formula (Y), the content of the structural unit represented by the formula (Y) is the amount of the structural unit contained in the electron-injecting and transporting polymer compound. With respect to the total content, for example, it is 0.1 to 100 mol %, and since the luminous efficiency of the light emitting device of the present disclosure is more excellent, it is preferably 1 to 100 mol %, more preferably 5 to 95 mol. %, more preferably 10 to 90 mol %, particularly preferably 20 to 80 mol %, particularly preferably 30 to 70 mol %, and even more preferably 40 to 60 mol %.

When the electron injecting and transporting polymer compound contains the structural unit represented by the formula (X), the content of the structural unit represented by the formula (X) is such that the function of the electron injecting and transporting polymer compound is achieved. It is acceptable if it is within the range of When the electron-injecting and transporting polymer compound contains the structural unit represented by formula (X), the content of the structural unit represented by formula (X) is the amount of the structural unit contained in the electron-injecting and transporting polymer compound. It is, for example, 0.01 to 100 mol % with respect to the total content, and is preferably 0.05 to 99 mol %, more preferably 0.05 to 99 mol %, because the luminous efficiency of the light emitting device of the present disclosure is more excellent. 1 to 90 mol%, more preferably 0.1 to 70 mol%, particularly preferably 0.2 to 500 mol%, particularly preferably 0.5 to 30 mol%, and even more preferably is 1 to 10 mol %.

A structural unit represented by formula (ET-1), a structural unit represented by formula (ET-2), and a structural unit represented by formula (Y), which may be contained in the electron-injecting and transporting polymer compound The total content of the constituent units represented by the formula and (X) may be within a range in which the function as an electron-injecting-transporting polymer compound can be exhibited. A structural unit represented by formula (ET-1), a structural unit represented by formula (ET-2), and a structural unit represented by formula (Y), which may be contained in the electron-injecting and transporting polymer compound The total content of structural units represented by the formula and (X) is, for example, 0.1 to 100 mol% of the total content of structural units contained in the electron-injecting and transporting polymer compound. , preferably 1 to 100 mol%, more preferably 10 to 100 mol%, even more preferably 30 to 100 mol%, and particularly preferably 50 to 100 mol %, particularly preferably 70 to 100 mol %, and even more preferably 90 to 100 mol %.

Examples of electron-injecting and transporting polymer compounds include polymer compounds EP-1 to EP-16 shown in Table 5. Here, "other" means a structural unit represented by formula (ET-1), a structural unit represented by formula (ET-2), a structural unit represented by formula (X), and a structural unit represented by formula (Y) means a structural unit other than the structural unit represented by

[In the table, p'', q'', r'', s'' and t' represent the molar ratio (mol%) of each structural unit. p″+q″+r″+s″+t″=100, and 70≦p″+q″+r″+s″≦100.]

The electron-injecting and transporting polymer compound may be any one of a block copolymer, a random copolymer, an alternating copolymer, a graft copolymer, or other modes. It is preferably a copolymer obtained by copolymerizing raw material monomers.
The polystyrene equivalent number average molecular weight of the electron-injecting and transporting polymer compound is preferably 5×10 ³ to 1×10 ⁶ , more preferably 1×10 ⁴ to 5×10 ⁵ , and still more preferably 1. 5×10 ⁴ to 1×10 ⁵ .

[Method for Producing Electron Injecting and Transporting Polymer Compound]
Electron injecting and transporting polymer compounds are, for example, JP-A-2009-239279, JP-A-2012-033845, JP-A-2012-216821, JP-A-2012-216822, JP-A-2012-216815. can be synthesized according to the method described in

[Second composition]
The second layer contains a second polymer compound and at least one selected from the group consisting of a hole-transporting material, a hole-injecting material, an electron-transporting material, an electron-injecting material, a light-emitting material, and an antioxidant. It may be a layer containing a composition (hereinafter also referred to as a “second composition”) or a layer formed using a second composition. In the second layer, the hole-transporting material, hole-injecting material, electron-transporting material, electron-injecting material and light-emitting material are different from the second polymeric compound.
The second composition contains one of each of the second polymer compound, the hole transport material, the hole injection material, the electron transport material, the electron injection material, the light emitting material, and the antioxidant. may be contained, or two or more kinds may be contained.
Examples and preferred ranges of the hole-transporting material, hole-injecting material, electron-transporting material, electron-injecting material, light-emitting material and antioxidant contained in the second composition are respectively contained in the first composition. Examples and preferred ranges of the hole-transporting material, hole-injecting material, electron-transporting material, electron-injecting material, and antioxidant.
In the second composition, the total content of the second polymer compound, the hole-transporting material, the hole-injecting material, the electron-transporting material, the electron-injecting material, the light-emitting material, and the antioxidant is It is sufficient if it is within the range where the function as In the second composition, the total content of the second polymer compound, the hole-transporting material, the hole-injecting material, the electron-transporting material, the electron-injecting material, the light-emitting material and the antioxidant is, for example, the second Based on the total amount of the composition, it may be 1 to 100% by mass, may be 10 to 100% by mass, may be 30 to 100% by mass, and more preferably 50 to 100% by mass. may be from 70 to 100% by mass, or from 90 to 100% by mass.
In the second composition, the contents of the hole-transporting material, the hole-injecting material, the electron-transporting material, the electron-injecting material, and the light-emitting material are each based on the content of the second polymer compound being 100 parts by mass. , usually from 1 to 10,000 parts by mass. In the second composition, the content of the antioxidant is usually 0.00001 to 10 parts by mass when the content of the second polymer compound is 100 parts by mass.

[Second ink]
The second layer can be formed using, for example, a composition containing a second polymer compound and a solvent (hereinafter also referred to as "second ink").
The second ink may contain one kind of the second polymer compound and the solvent, or may contain two or more kinds thereof.
The second ink can be suitably used for the wet method described in the section on the first ink.
The preferred range of viscosity for the second ink is the same as the preferred range for the viscosity of the first ink.
The example and preferred range of the solvent contained in the second ink are the same as the example and preferred range of the solvent contained in the first ink.
The solvent contained in the second ink can laminate the second layer on the layer (e.g., the first layer) by utilizing the difference in solubility. Ethers, esters, nitrile compounds, nitro compounds, fluorinated alcohols, thiols, sulfides, sulfoxides, thioketones, amides and/or carboxylic acids. Specific examples of the solvent include methanol, ethanol, 2-propanol, 1-butanol, tert-butyl alcohol, acetonitrile, 1,2-ethanediol, N,N-dimethylformamide, dimethylsulfoxide, acetic acid, nitromethane, propylene carbonate. , pyridine, carbon disulfide, and mixed solvents of these solvents. When a mixed solvent is used, one or more solvents selected from water, alcohol, ether, ester, nitrile compound, nitro compound, fluorinated alcohol, thiol, sulfide, sulfoxide, thioketone, amide, and carboxylic acid, a chlorinated solvent, It may be a mixed solvent with one or more solvents selected from aromatic hydrocarbon solvents, aliphatic hydrocarbon solvents and ketone solvents.
In the second ink, the content of the solvent is usually 1000 to 10000000 parts by mass when the content of the second polymer compound is 100 parts by mass.

The second ink may further contain at least one selected from the group consisting of hole-transporting materials, hole-injecting materials, electron-transporting materials, electron-injecting materials, light-emitting materials, and antioxidants.
The second ink may contain one of each of the hole transport material, the hole injection material, the electron transport material, the electron injection material, the luminescent material, and the antioxidant, or may contain two or more of them. may have been
Examples and preferred ranges of the hole-transporting material, the electron-transporting material, the hole-injecting material, the electron-injecting material, the light-emitting material, and the antioxidant, which the second ink may further include, are described in the second composition, respectively. are the same as the examples and preferred ranges of the hole transport material, electron transport material, hole injection material, electron injection material, light emitting material and antioxidant contained in .
The content of the hole-transporting material, the electron-transporting material, the hole-injecting material, the electron-injecting material, and the light-emitting material, which the second ink may further contain, is the content of the compound having a cross-linking group, which is 100 mass When expressed as parts, it is usually 1 to 10,000 parts by mass. The content of the antioxidant that the second ink may further contain is usually 0.00001 to 10 parts by mass when the content of the compound having a cross-linking group is 100 parts by mass.

[Third composition]
The third layer contains a second polymer compound and at least one selected from the group consisting of a hole-transporting material, a hole-injecting material, an electron-transporting material, an electron-injecting material, a light-emitting material and an antioxidant. It may be a layer containing a composition (hereinafter also referred to as a “third composition”) or a layer formed using a third composition. In the third layer, the hole-transporting material, hole-injecting material, electron-transporting material, electron-injecting material and light-emitting material are different from the second polymeric compound.
The third composition contains one of each of the third polymer compound, the hole transport material, the hole injection material, the electron transport material, the electron injection material, the light emitting material, and the antioxidant. may be contained, or two or more kinds may be contained.
Examples and preferred ranges of the hole-transporting material, hole-injecting material, electron-transporting material, electron-injecting material, light-emitting material and antioxidant contained in the third composition are respectively contained in the first composition. Examples and preferred ranges of the hole-transporting material, hole-injecting material, electron-transporting material, electron-injecting material, and antioxidant.
In the third composition, the total content of the second polymer compound, the hole-transporting material, the hole-injecting material, the electron-transporting material, the electron-injecting material, the light-emitting material, and the antioxidant is It is sufficient if it is within the range where the function as In the third composition, the total content of the second polymer compound, the hole-transporting material, the hole-injecting material, the electron-transporting material, the electron-injecting material, the light-emitting material, and the antioxidant is, for example, Based on the total amount of the composition, it may be 1 to 100% by mass, may be 10 to 100% by mass, may be 30 to 100% by mass, and more preferably 50 to 100% by mass. may be from 70 to 100% by mass, or from 90 to 100% by mass.
In the third composition, the contents of the hole-transporting material, the hole-injecting material, the electron-transporting material, the electron-injecting material, and the light-emitting material are each based on the content of the second polymer compound being 100 parts by mass. , usually from 1 to 10,000 parts by mass. In the third composition, the content of the antioxidant is usually 0.00001 to 10 parts by mass when the content of the second polymer compound is 100 parts by mass.

[Third ink]
The third layer can be formed using, for example, a composition containing a second polymer compound and a solvent (hereinafter also referred to as "third ink").
The third ink may contain one kind of the second polymer compound and the solvent, or may contain two or more kinds thereof.
The third ink can be suitably used for the wet method described in the section on the first ink.
The preferred range of viscosity for the third ink is the same as the preferred range for the viscosity of the first ink.
The example and preferred range of the solvent contained in the third ink are the same as the example and preferred range of the solvent contained in the first ink.
The solvent contained in the third ink can laminate the third layer on the layer (e.g., the first layer) by utilizing the difference in solubility. Ethers, esters, nitrile compounds, nitro compounds, fluorinated alcohols, thiols, sulfides, sulfoxides, thioketones, amides and/or carboxylic acids. Specific examples of the solvent include methanol, ethanol, 2-propanol, 1-butanol, tert-butyl alcohol, acetonitrile, 1,2-ethanediol, N,N-dimethylformamide, dimethylsulfoxide, acetic acid, nitromethane, propylene carbonate. , pyridine, carbon disulfide, and mixed solvents of these solvents. When a mixed solvent is used, one or more solvents selected from water, alcohol, ether, ester, nitrile compound, nitro compound, fluorinated alcohol, thiol, sulfide, sulfoxide, thioketone, amide, and carboxylic acid, a chlorinated solvent, It may be a mixed solvent with one or more solvents selected from aromatic hydrocarbon solvents, aliphatic hydrocarbon solvents and ketone solvents.
In the third ink, the content of the solvent is usually 1000 to 10000000 parts by mass when the content of the second polymer compound is 100 parts by mass.

The third ink may further contain at least one selected from the group consisting of hole-transporting materials, hole-injecting materials, electron-transporting materials, electron-injecting materials, light-emitting materials, and antioxidants.
The third ink may contain one kind of hole transport material, hole injection material, electron transport material, electron injection material, luminescent material and antioxidant, respectively, or contain two or more kinds. may have been
Examples and preferred ranges of the hole-transporting material, electron-transporting material, hole-injecting material, electron-injecting material, light-emitting material, and antioxidant, which the third ink may further include, are described in the third composition, respectively. are the same as the examples and preferred ranges of the hole transport material, electron transport material, hole injection material, electron injection material, light emitting material and antioxidant contained in .
The content of the hole-transporting material, the electron-transporting material, the hole-injecting material, the electron-injecting material, and the light-emitting material, which the third ink may further contain, is the content of the compound having a cross-linking group of 100 mass When expressed as parts, it is usually 1 to 10,000 parts by mass. The content of the antioxidant that the second ink may further contain is usually 0.00001 to 10 parts by mass when the content of the compound having a cross-linking group is 100 parts by mass.

<Light emitting element>
A light-emitting device of the present disclosure is a light-emitting device having an anode, a cathode, and first, second, and third layers provided between the anode and the cathode.
The light emitting device of this embodiment may further have layers other than the anode, cathode, first layer, second layer and third layer.

The light-emitting device of the present disclosure has excellent luminous efficiency.
The reason why the above effects are exhibited is presumed as follows, but is not limited thereto.

In addition to the first layer, the light emitting device of the present disclosure has a second layer and a third layer containing a specific polymer compound, so that the first layer, the second layer, and the third layer can improve or adjust the light emitting properties, charge transport properties and/or charge injection properties of the second layer and the third layer containing a specific polymer compound. The film quality or the like of the third layer is improved, for example, the charge injection characteristics from the second layer to the first layer, the charge injection characteristics from the third layer to the first layer, and/or the third layer It is presumed that the luminous efficiency of the light-emitting element is improved by improving or adjusting the charge injection characteristics from the layer to the second layer.

In the light-emitting element of the present disclosure, the first layer and the second layer are preferably adjacent to each other because the light-emitting element of the present disclosure has higher luminous efficiency. In the light-emitting element of the present disclosure, when the first layer and the second layer are adjacent, the first layer and the third layer are adjacent, or the second layer and the third layer are adjacent. Preferably, the three layers are adjacent, and more preferably the first layer and the third layer are adjacent.
Further, in the light-emitting element of the present disclosure, the first layer and the third layer are preferably adjacent to each other because the light-emitting element of the present disclosure has higher luminous efficiency. In the light emitting element of the present disclosure, when the first layer and the third layer are adjacent, the first layer and the second layer are adjacent, or the third layer and the third layer are adjacent. Preferably, the two layers are adjacent, more preferably the first layer and the second layer are adjacent.

In the light-emitting device of the present disclosure, the first layer is usually a light-emitting layer (hereinafter referred to as "first light-emitting layer").
In the light-emitting device of the present embodiment, the second layer is usually a hole injection layer, a hole transport layer, and a light-emitting layer (that is, a light-emitting layer separate from the first light-emitting layer, hereinafter referred to as "second or an electron-transporting layer, preferably a hole-injecting layer, a hole-transporting layer or a second emitting layer, more preferably a hole-injecting layer or a hole-transporting layer. A hole transport layer is particularly preferred.
In the light-emitting device of the present disclosure, the third layer is typically a hole-injection layer, a hole-transport layer, a light-emitting layer (i.e., a separate light-emitting layer from the first light-emitting layer and the second light-emitting layer, Hereinafter, referred to as a "third light emitting layer") or an electron transport layer, preferably a hole injection layer, a hole transport layer or an electron transport layer, more preferably a hole transport layer or an electron transport layer layer.

In the light-emitting device of the present disclosure, the second layer is preferably a layer provided between the anode and the first layer because the light-emitting device of the present disclosure has higher luminous efficiency. It is more preferably a hole injection layer, a hole transport layer or a second light-emitting layer provided between the layers, and a hole injection layer or hole transport layer provided between the anode and the first layer. is more preferred, and a hole transport layer provided between the anode and the first layer is particularly preferred.

In the light-emitting device of the present disclosure, when the second layer is the second light-emitting layer provided between the anode and the first layer, the luminous efficiency of the light-emitting device of the present disclosure is superior. It is preferable to further have at least one layer of a hole injection layer and a hole transport layer between the layers of . In addition, when the second layer is a second light-emitting layer provided between the anode and the first layer, the light-emitting element of the present disclosure has better light-emitting efficiency, so Furthermore, it is preferable to further have at least one layer of an electron injection layer and an electron transport layer.
In the light-emitting device of the present disclosure, when the second layer is the second light-emitting layer provided between the cathode and the first layer, the light-emitting device of the present disclosure has better light emission efficiency. It is preferable to further have at least one layer of a hole injection layer and a hole transport layer between the layers of . In addition, when the second layer is a second light-emitting layer provided between the cathode and the first layer, the light-emitting element of the present disclosure has better light-emitting efficiency. Furthermore, it is preferable to further have at least one layer of an electron injection layer and an electron transport layer.
In the light-emitting device of the present disclosure, when the second layer is a hole-transporting layer provided between the anode and the first layer, the luminous efficiency of the light-emitting device of the present disclosure is superior. It is preferable to further have a hole injection layer between the layers. Further, when the second layer is a hole-transporting layer provided between the anode and the first layer, the luminous efficiency of the light-emitting device of the present disclosure is more excellent. , an electron injection layer and an electron transport layer.
In the light emitting device of the present disclosure, when the second layer is a hole injection layer provided between the anode and the first layer, the luminous efficiency of the light emitting device of the present disclosure is superior. It is preferable to further have a hole transport layer between the second layer. Further, when the second layer is a hole injection layer provided between the anode and the first layer, the luminance lifetime of the luminous efficiency of this embodiment is superior, so the Furthermore, it is preferable to further have at least one layer of an electron injection layer and an electron transport layer.
In the light-emitting device of the present disclosure, when the second layer is an electron-transporting layer provided between the cathode and the first layer, the luminous efficiency of the light-emitting device of the present disclosure is more excellent. It is preferable to further have at least one layer of a hole injection layer and a hole transport layer between. Further, when the second layer is an electron-transporting layer provided between the cathode and the first layer, the luminous efficiency of the light-emitting device of the present disclosure is more excellent. It is preferable to further have an electron injection layer.

In the light-emitting device of the present disclosure, the third layer is a layer provided between the first layer and the second layer, or the first layer and the It is preferably a layer provided between the cathode, a hole injection layer or a hole transport layer provided between the first layer and the second layer, or between the first layer and the cathode. more preferably an electron-transporting layer provided, a hole-transporting layer provided between the first layer and the second layer, or an electron-transporting layer provided between the first layer and the cathode is more preferable.

In the light-emitting device of the present disclosure, when the third layer is the third light-emitting layer provided between the anode and the first layer, the light-emitting device of the present disclosure has superior luminous efficiency. It is preferable to further have at least one layer of a hole injection layer and a hole transport layer between the layers of . In addition, when the third layer is a third light-emitting layer provided between the anode and the first layer, the light-emitting element of the present disclosure has better light-emitting efficiency, so Furthermore, it is preferable to further have at least one layer of an electron injection layer and an electron transport layer.
In the light-emitting device of the present disclosure, when the third layer is the third light-emitting layer provided between the cathode and the first layer, the light-emitting device of the present disclosure has better light emission efficiency. It is preferable to further have at least one layer of a hole injection layer and a hole transport layer between the layers of . In addition, when the third layer is a third light-emitting layer provided between the cathode and the first layer, the light-emitting element of the present disclosure has superior light-emitting efficiency. Furthermore, it is preferable to further have at least one layer of an electron injection layer and an electron transport layer.
In the light-emitting device of the present disclosure, when the third layer is a hole-transporting layer provided between the anode and the first layer, the light-emitting device of the present disclosure has superior luminous efficiency. It is preferable to further have a hole injection layer between the layers. Further, when the third layer is a hole-transporting layer provided between the anode and the first layer, the luminance life of the light-emitting device of the present disclosure is superior, so , an electron injection layer and an electron transport layer.
In the light emitting device of the present disclosure, when the third layer is a hole injection layer provided between the anode and the first layer, the luminous efficiency of the light emitting device of the present disclosure is more excellent. It is preferable to further have a hole transport layer between the third layer. Further, when the third layer is a hole injection layer provided between the anode and the first layer, the luminance lifetime of the light emitting device of the present disclosure is better, so , an electron injection layer and an electron transport layer.
In the light-emitting device of the present disclosure, when the third layer is an electron-transporting layer provided between the cathode and the first layer, the luminance lifetime of the light-emitting device of the present disclosure is better, so the anode and the first layer It is preferable to further have at least one layer of a hole injection layer and a hole transport layer between. In addition, when the third layer is an electron-transporting layer provided between the cathode and the first layer, the luminance lifetime of the light-emitting device of the present disclosure is better. It is preferable to further have an electron injection layer.

Specific layer structures of the light-emitting device of the present disclosure include, for example, layer structures represented by (D1) to (D12) below. The light-emitting device of the present disclosure usually has a substrate, but may be laminated on the substrate from the anode, or may be laminated on the substrate from the cathode.

(D1) anode/hole injection layer (third layer)/hole transport layer (second layer)/first emitting layer (first layer)/cathode (D2) anode/hole transport layer ( third layer)/second light-emitting layer (second layer)/first light-emitting layer (first layer)/cathode (D3) anode/hole transport layer (second layer)/first Light emitting layer (first layer)/electron transport layer (third layer)/cathode (D4) anode/hole injection layer/hole transport layer (third layer)/hole transport layer (second layer )/first emitting layer (first layer)/cathode (D5) anode/hole injection layer/hole transport layer (third layer)/second emitting layer (second layer)/first Emissive layer (first layer)/cathode (D6) anode/hole injection layer/hole transport layer (second layer)/first luminescent layer (first layer)/electron transport layer (third layer) / cathode (D7) anode / hole injection layer (second layer) / hole transport layer (third layer) / first light emitting layer (first layer) / electron transport layer / cathode ( D8) anode/hole transport layer (second layer)/third light emitting layer (third layer)/first light emitting layer (first layer)/electron injection layer/cathode (D9) anode/positive Hole injection layer/hole transport layer (third layer)/second light emitting layer (second layer)/first light emitting layer (first layer)/electron transport layer/cathode (D10) anode/positive Hole injection layer/hole transport layer (second layer)/first emitting layer (first layer)/electron transport layer (third layer)/electron injection layer/cathode (D11) anode/hole injection layer/hole-transporting layer (third layer)/hole-transporting layer (second layer)/first emitting layer (first layer)/electron-transporting layer/electron-injecting layer/cathode (D12) anode/ Hole injection layer/hole transport layer (third layer)/hole transport layer (second layer)/first emitting layer (first layer)/electron injection layer/cathode

In (D1) to (D12) above, "/" means that the layers before and after it are laminated adjacent to each other. For example, "hole transport layer (second layer)/first light emitting layer (first layer)" means the combination of the hole transport layer (second layer) and the first light emitting layer (first layer). ) means that they are stacked adjacent to each other.

In the light-emitting device of the present disclosure, when the second layer is a layer provided between the anode and the first layer, the second layer is formed using a hole-injecting and transporting polymer compound. Layers are preferred. In the light-emitting device of the present disclosure, when the third layer is a layer provided between the anode and the first layer, the third layer is formed using a hole-injecting and transporting polymer compound. Layers are preferred.
In the light-emitting device of the present disclosure, when the second layer is a layer provided between the cathode and the first layer, the second layer is a layer formed using an electron-injecting-transporting polymer compound. is preferably In the light-emitting device of the present disclosure, when the third layer is a layer provided between the cathode and the first layer, the third layer is a layer formed using an electron-injecting-transporting polymer compound. is preferably

The second layer is a layer provided between the anode and the first layer, the third layer is a layer provided between the cathode and the first layer, and the third layer and the third layer are Preferably, the first layer is adjacent to the first layer, and the second layer is adjacent to the first layer.

The second layer and the third layer are layers provided between the anode and the first layer, and the second layer and the third layer are structural units represented by formula (X) , a structural unit represented by the formula (Y), a structural unit represented by the formula (Z), and a structural unit represented by the formula (Z′). It is preferably a layer formed using a polymer compound. Further, the third layer is a layer provided between the anode and the second layer, the third layer and the second layer are adjacent to each other, and the second layer and the first layer are More preferably, the layers are adjacent to each other.

In the light emitting device of the present disclosure, two or more layers of the anode, hole injection layer, hole transport layer, light emitting layer, electron transport layer, electron injection layer, and cathode may each be provided, if necessary. When there are a plurality of anodes, hole-injection layers, hole-transport layers, light-emitting layers, electron-transport layers, electron-injection layers, and cathodes, the materials constituting them may be the same or different.

In the light emitting device of the present disclosure, the thicknesses of the anode, the hole injection layer, the hole transport layer, the first layer, the second layer, the light emitting layer, the electron transport layer, the electron injection layer and the cathode are usually 1 nm to It is 1 μm, preferably 2 nm to 500 nm, more preferably 5 nm to 150 nm.

In the light-emitting element of the present disclosure, the order, number, and thickness of the layers to be stacked may be adjusted in consideration of the luminance lifetime of the light-emitting element.

[First light-emitting layer]
The first emissive layer is typically the first layer.

[Second light-emitting layer]
The second light-emitting layer is usually a second layer or a layer containing a light-emitting material, preferably a layer containing a light-emitting material. When the second light-emitting layer is a layer containing a light-emitting material, the light-emitting material contained in the second light-emitting layer includes, for example, the light-emitting material that the first composition may contain. be done. The light-emitting material contained in the second light-emitting layer may be contained singly or in combination of two or more.
If the light-emitting device of the present disclosure has a second light-emitting layer, and the hole-injection layer described below, the hole-transport layer described later, and the electron-transport layer described later are not the second layer, then the second light-emitting layer is preferably the second layer.

[Third light-emitting layer]
The third light-emitting layer is usually a third layer or a layer containing a light-emitting material, preferably a layer containing a light-emitting material. When the third light-emitting layer is a layer containing a light-emitting material, the light-emitting material contained in the third light-emitting layer includes, for example, the light-emitting material that may be contained in the above-described first composition. be done. The light-emitting material contained in the third light-emitting layer may be contained singly or in combination of two or more.
If the light-emitting device of the present disclosure has a third light-emitting layer, and the hole-injection layer described below, the hole-transport layer described later, and the electron-transport layer described later are not the third layer, then the third light-emitting layer is preferably the third layer.

[Hole transport layer]
The hole-transporting layer is a second layer, a third layer or a layer containing a hole-transporting material, preferably the second layer or the third layer. When the hole-transporting layer is a layer containing a hole-transporting material, the hole-transporting material includes, for example, the hole-transporting material that the second composition may contain. The hole-transporting material contained in the hole-transporting layer may be contained alone or in combination of two or more.
When the light-emitting device of the present disclosure has a hole-transport layer, and the hole-injection layer described below, the electron-transport layer described below, and the second light-emitting layer described above are not the second layer, the hole-transport layer is It is preferably the second layer.
When the light-emitting device of the present disclosure has a hole-transport layer, and the hole-injection layer described below, the electron-transport layer described below, and the third light-emitting layer described above are not the third layer, the hole-transport layer is A third layer is preferred.

[Electron transport layer]
The electron-transporting layer is the second layer, the third layer, or a layer containing an electron-transporting material, preferably the third layer. When the electron-transporting layer is a layer containing an electron-transporting material, the electron-transporting material contained in the electron-transporting layer includes, for example, the electron-transporting material that the first composition may contain. . The electron-transporting material contained in the electron-transporting layer may be contained alone or in combination of two or more.
When the light-emitting device of the present disclosure has an electron-transporting layer, and the hole-injecting layer described below, the hole-transporting layer described above, and the third light-emitting layer described above are not the third layer, the electron-transporting layer is the third layer. Three layers are preferred.
When the light-emitting device of the present disclosure has an electron-transporting layer, and the hole-injecting layer described below, the hole-transporting layer described above, and the second light-emitting layer described above are not the second layer, the electron-transporting layer is the second layer. Two layers are preferred.

[Hole injection layer]
The hole injection layer is the second layer, the third layer or a layer containing a hole injection material, preferably a layer containing a hole injection material. When the hole-injecting layer is a layer containing a hole-injecting material, the hole-injecting material contained in the hole-injecting layer includes, for example, the holes that the first composition may contain. Infusion materials are included. The hole injection material contained in the hole injection layer may be contained singly or in combination of two or more.
When the light-emitting device of the present disclosure has a hole-injection layer, and the aforementioned second light-emitting layer, the aforementioned hole-transporting layer and the aforementioned electron-transporting layer are not the second layer, the hole-injecting layer is It is preferably the second layer.
When the light-emitting device of the present disclosure has a hole-injection layer, and the aforementioned third light-emitting layer, the aforementioned hole-transporting layer and the aforementioned electron-transporting layer are not the third layer, the hole-injecting layer is A third layer is preferred.

[Electron injection layer]
An electron injection layer is a layer containing an electron injection material. The electron injection material contained in the electron injection layer includes, for example, the electron injection material that the first composition may contain. The electron injection material contained in the electron injection layer may be contained singly or in combination of two or more.

[Substrate/electrode]
The substrate in the light-emitting device is preferably a substrate that does not chemically change during the formation of the electrodes and the formation of the organic layer. The substrate may be, for example, a substrate made of materials such as glass, plastic, silicon, and the like. If an opaque substrate is used, the electrode furthest from the substrate is preferably transparent or translucent.
Examples of materials for the anode include conductive metal oxides and translucent metals, preferably indium oxide, zinc oxide, tin oxide; indium-tin-oxide (ITO), indium-zinc-oxide, etc. conductive compounds of; silver-palladium-copper composite (APC); NESA, gold, platinum, silver, copper.
Examples of cathode materials include metals such as lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, aluminum, zinc, and indium; alloys of two or more of them; alloys of one or more species with one or more of silver, copper, manganese, titanium, cobalt, nickel, tungsten, tin; and graphite and graphite intercalation compounds. Examples of alloys include magnesium-silver alloys, magnesium-indium alloys, magnesium-aluminum alloys, indium-silver alloys, lithium-aluminum alloys, lithium-magnesium alloys, lithium-indium alloys, and calcium-aluminum alloys.
In the light-emitting device of the present disclosure, at least one of the anode and cathode is usually transparent or translucent, and the anode is preferably transparent or translucent.
Methods for forming the anode and cathode include, for example, a vacuum deposition method, a sputtering method, an ion plating method, a plating method and a laminating method.

[Method for manufacturing light-emitting element]
In the method for manufacturing the light-emitting device of the present disclosure, the method for forming the first layer, the second layer, and the layers other than the first layer and the second layer may be, for example, vacuum A dry method such as a vapor deposition method and a wet method described in the section of the first ink can be used, and when a polymer compound is used, for example, the wet method described in the section of the first ink can be used.
In the method for manufacturing a light-emitting device of the present embodiment, the first layer, the second layer, and the layers other than the first layer and the second layer are the various inks described above, and the various materials and solvents described above. may be formed by the wet method described in the section of the first ink, or may be formed by a dry method such as a vacuum deposition method.

Methods for forming the first layer, the second layer, and the third layer include, for example, a dry method and a wet method, and the wet method is preferable because it facilitates the production of the light-emitting device of the present disclosure. In the method of forming the first layer and the second layer, the dry method includes, for example, a vacuum deposition method. In the method of forming the first layer and the second layer, examples of the wet method include the wet method described in the section on the first ink.
When the first layer is formed by a wet method, it is preferable to use the first ink because it facilitates the manufacture of the light-emitting device of the embodiment. That is, the first layer is preferably formed by a wet method using the first ink.
When the second layer is formed by a wet method, it is preferable to use the second ink because it facilitates the manufacture of the light-emitting device of the embodiment. That is, the second layer is preferably formed by a wet method using the second ink.

In the method for manufacturing a light-emitting device of the present disclosure, the layer containing a crosslinked compound of a compound having a crosslinkable group (e.g., the second layer and the third layer) is, for example, a layer containing a compound having a crosslinkable group. After that, by heating or light irradiation (preferably heating), the compound having a cross-linking group contained in the layer can be cross-linked. When the compound having a cross-linking group is contained in a layer in a cross-linked state (a cross-linked product of a compound having a cross-linking group), the layer is substantially insoluble in a solvent. Therefore, the layer containing the crosslinked product of the compound having a crosslinkable group can be suitably used for lamination of layers in the production of the light emitting device of the present disclosure.

From the above viewpoint, in the method for manufacturing a light-emitting element of the present disclosure, the step of forming the second layer or the third layer using the compound having a cross-linking group is performed after forming the layer containing the compound having a cross-linking group. , the step of cross-linking the compound having a cross-linking group contained in the layer to form a second layer or a third layer containing a cross-linked compound of the compound having a cross-linking group. In the step of forming the second layer or the third layer using a compound having a cross-linking group, as a method for cross-linking the compound having a cross-linking group, it is possible to easily manufacture the light-emitting element of the embodiment. Alternatively, a method of cross-linking by light irradiation is preferable, and a method of cross-linking by heating is more preferable.

The heating temperature for cross-linking is usually 25°C to 300°C, preferably 50°C to 260°C, more preferably 130°C to 230°C, still more preferably 180°C to 210°C. .
The heating time is usually 0.1 to 1000 minutes, preferably 0.5 to 500 minutes, more preferably 1 to 120 minutes, still more preferably 10 to 60 minutes. .
Types of light used for light irradiation are, for example, ultraviolet light, near-ultraviolet light, and visible light.

As the step of forming the second layer or the third layer using a compound having a cross-linking group, for example, after forming a layer by a wet method using the second ink or the third ink, A method of cross-linking a compound having a cross-linking group to form a second layer or a third layer; is formed, the compound having a cross-linking group contained in the layer is cross-linked to form the second layer or the third layer.

Methods for analyzing components contained in the first layer, the second layer, the third layer, or layers other than the first layer, the second layer, and the third layer include chemical analysis such as extraction, for example. instrumental analysis methods such as chemical separation analysis methods, infrared spectroscopy (IR), nuclear magnetic resonance spectroscopy (NMR), mass spectrometry (MS), and analysis methods combining chemical separation analysis methods and instrumental analysis methods is mentioned.
By performing solid-liquid extraction using an organic solvent such as toluene, xylene, chloroform, tetrahydrofuran, etc. on the first layer, the second layer, or a layer other than the first layer and the second layer, It is possible to separate into a component that is substantially insoluble in an organic solvent (insoluble component) and a component that dissolves in an organic solvent (soluble component). Insoluble components can be analyzed by infrared spectroscopy or nuclear magnetic resonance spectroscopy, and dissolved components can be analyzed by nuclear magnetic resonance spectroscopy or mass spectroscopy.

The light-emitting device of the present disclosure can be manufactured, for example, by sequentially laminating each layer on a substrate. Specifically, an anode is provided on a substrate, layers such as a hole injection layer and a hole transport layer are provided thereon, a light emitting layer is provided thereon, and an electron transport layer, an electron injection layer and the like are provided thereon. A light-emitting device can be manufactured by providing a layer and further laminating a cathode thereon. As another manufacturing method, a cathode is provided on a substrate, layers such as an electron injection layer, an electron transport layer, a light emitting layer, a hole transport layer, and a hole injection layer are provided thereon, and an anode is further provided thereon. A light-emitting device can be manufactured by stacking. In still another manufacturing method, an anode or a cathode-side base material having layers laminated on the anode and a cathode or a cathode-side base material having layers laminated on the cathode may be opposed and bonded to each other. can.

Materials used to form a hole injection layer, materials used to form a light emitting layer, materials used to form a hole transport layer, materials used to form an electron transport layer, and electron injection in the manufacture of the light emitting device of the present disclosure When the materials used for forming the layers are soluble in the solvent used for forming the layers adjacent to the hole injection layer, the light emitting layer, the hole transport layer, the electron transport layer, and the electron injection layer, the Dissolution of the material is preferably avoided. Methods for avoiding material dissolution include i) a method of using a material having a cross-linking group, and ii) a method of providing a difference in the solubility of adjacent layers in a solvent. As the method i) above, for example, after forming a layer (for example, a hole transport layer) using a material having a crosslinkable group, the layer can be insolubilized by crosslinking the crosslinkable group, A layer different from the layer (for example, a light-emitting layer) can be laminated on the layer. Further, as the method ii), for example, after forming a layer (e.g., a light-emitting layer), an ink containing a solvent with low solubility is used for the layer, so that the layer A different layer (eg, an electron-transport layer) can be deposited.

[Use]
The light-emitting device of the present embodiment is suitable as a light source for backlighting of a liquid crystal display device, a light source for lighting, an organic EL lighting, a display device such as a computer, a television, and a mobile terminal (for example, an organic EL display and an organic EL television). can be used for

EXAMPLES The present disclosure will be described in more detail below with reference to Examples, but the present disclosure is not limited to these Examples.

In the examples, the polystyrene-equivalent number-average molecular weight (Mn) and polystyrene-equivalent weight-average molecular weight (Mw) of the polymer compound were determined by size exclusion chromatography (SEC) using tetrahydrofuran as a mobile phase. In addition, each measurement condition of SEC is as follows.
A polymer compound to be measured was dissolved in tetrahydrofuran at a concentration of about 0.05% by mass, and 10 μL of the solution was injected into SEC. Mobile phase was run at a flow rate of 2.0 mL/min. As a column, PLgel MIXED-B (manufactured by Polymer Laboratories) was used. A UV-VIS detector (manufactured by Shimadzu Corporation, trade name: SPD-10Avp) was used as a detector.

NMR was measured by the following method.
5 to 10 mg of a measurement sample was added to about 0.5 mL of heavy chloroform (CDCl ₃ ), heavy tetrahydrofuran, heavy dimethylsulfoxide, heavy acetone, heavy N,N-dimethylformamide, heavy toluene, heavy methanol, heavy ethanol, heavy 2-propanol. Or dissolved in methylene dichloride, NMR equipment (manufactured by Agilent, trade name: INOVA300 or MERCURY
400 VX).

For calculation of the _ΔEST value of the compound, the ground state of the compound was structurally optimized by density functional theory at the B3LYP level. At that time, 6-31G* was used as a basis function. Then, using the obtained optimized structure, _ΔEST of the compound was calculated by time-dependent density functional theory at the B3LYP level. The calculation was performed using Gaussian09 as a quantum chemical calculation program.

The maximum peak wavelength of the emission spectrum of the compound at room temperature was measured at room temperature with a spectrophotometer (manufactured by JASCO Corporation, FP-6500). A xylene solution in which a compound was dissolved in xylene at a concentration of about 8×10 ⁻⁴ mass % was used as a sample. Ultraviolet (UV) light with a wavelength of 325 nm was used as excitation light.

<Synthesis and acquisition of compound H1, metal complexes MC1 to MC2, compound B1, polymer compound HP1, and low-molecular-weight compound HTL-3>
Compound H1, compound B1, high molecular weight compound HP1 and low molecular weight compound HTL-3 were manufactured by Luminescence Technology.
Metal complex MC1 and metal complex MC2 were synthesized according to the method described in JP-A-2013-147551.

The _ΔEST of compound B1 was 0.49 eV. The maximum peak wavelength of the emission spectrum of compound B1 at room temperature was 452 nm. The maximum peak half width of the emission spectrum of compound B1 at room temperature was 22 nm.

<Synthesis Example M> Synthesis of Compounds M1 to M3 Compound M1 was synthesized according to the method described in WO2015/145871.
Compound M2 was synthesized according to the method described in WO2013/146806.
Compound M3 was synthesized according to the method described in WO2005/049546.
Compound M4 was synthesized according to the method described in JP-A-2010-189630.
Compound M5 was synthesized according to the method described in WO2013/191088.
Compound M6 was synthesized according to the method described in WO2015/145871.
Compound M7 was synthesized according to the method described in JP-A-2015-063482.
Compound M8, compound M9 and compound M11 were synthesized according to the method described in WO2002/045184.
Compound M10 was synthesized according to the method described in JP-A-2011-174062.
Compound M12 was synthesized according to the method described in JP-T-2007-511636.
Compound M13 was synthesized according to the method described in JP-A-2010-215886.
Compound M14 was synthesized according to the method described in JP-A-2008-106241.
Compound M15 was synthesized according to the method described in WO2015/141603.
Compound M16 was synthesized according to the method described in WO2013/146806.

<Synthesis example HTL-1> Synthesis of polymer compound HTL-1 (Synthesis of polymer compound HTL-1)
Polymer compound HTL-1 was synthesized using compound M1, compound M2 and compound M3 according to the method described in WO 2015/145871. The Mn of the polymer compound HTL-1 was 2.3×10 ⁴ and the Mw was 1.2×10 ⁵ .
In the polymer compound HTL-1, the theoretical values obtained from the amounts of the raw materials charged are the structural units derived from the compound M1, the structural units derived from the compound M2, and the structural units derived from the compound M3. It is a copolymer made up of a molar ratio of 45:5:50.

<Synthesis example HTL-2> Synthesis of polymer compound HTL-2 (Synthesis of polymer compound HTL-2)
Polymer compound HTL-2 was synthesized using compound M8, compound M11 and compound M12 according to the method described in WO2011/049241. The Mn of the polymer compound HTL-2 was 8.8×10 ⁴ and the Mw was 4.2×10 ⁵ .
In the polymer compound HTL-2, the theoretical values obtained from the amounts of the raw materials charged are the structural units derived from the compound M8, the structural units derived from the compound M11, and the structural units derived from the compound M12. It is a copolymer composed of a molar ratio of 50:42.5:7.5.

<Synthesis Example HTL-4> Synthesis of Polymer Compound HTL-4 (Synthesis of Polymer Compound HTL-4)
Polymer compound HTL-4 was synthesized using compound M4, compound M8, compound M14 and compound M13 according to the method described in WO2018/062278. The Mn of the polymer compound HTL-4 was 5.2×10 ⁴ and the Mw was 2.5×10 ⁵ .
The theoretical values obtained from the amounts of the raw materials for the polymer compound HTL-4 are the structural units derived from the compound M4, the structural units derived from the compound M8, the structural units derived from the compound M14, and the compound A copolymer composed of structural units derived from M13 in a molar ratio of 50:40:5:5.

<Synthesis Example HTL-5> Synthesis of Polymer Compound HTL-5 (Synthesis of Polymer Compound HTL-5)
Polymer compound HTL-5 was synthesized using compound M10, compound M16, compound M14 and compound M13 according to the method described in WO2013/108022. The polymer compound HTL-5 had an Mn of 4.3×10 ⁴ and an Mw of 1.4×10 ⁵ . The theoretical values obtained from the amounts of the starting materials for the polymer compound HTL-5 are the structural units derived from the compound M10, the structural units derived from the compound M16, the structural units derived from the compound M14 and the compound A copolymer composed of structural units derived from M13 in a molar ratio of 50:42.5:3.75:3.75.

<Synthesis Example HTL-6> Synthesis of Polymer Compound HTL-6 (Synthesis of Polymer Compound HTL-6)
Polymer compound HTL-6 was synthesized using compound M10, compound M15, compound M9 and compound M14 according to the method described in WO2015/141603. The Mn of the polymer compound HTL-6 was 6.6×10 ⁴ and the Mw was 2.3×10 ⁵ .
The theoretical values obtained from the amounts of the starting materials for the polymer compound HTL-6 are the structural units derived from the compound M10, the structural units derived from the compound M15, the structural units derived from the compound M9 and the compound A copolymer composed of structural units derived from M14 in a molar ratio of 50:30:12.5:7.5.

<Synthesis Example ET1> Synthesis of Polymer Compound ET1 (Synthesis of Polymer Compound ET1a)
The polymer compound ET1a is a compound ET1-1 synthesized according to the method described in JP-A-2012-33845, and a compound ET1-2 synthesized according to the method described in JP-A-2012-33845. It was synthesized according to the method described in JP-A-2012-33845.

Mn of the polymer compound ET1a was 5.2×10 ⁴ .

The polymer compound ET1a is composed of structural units derived from the compound ET1-1 and structural units derived from the compound ET1-2 at a molar ratio of 50:50, according to the theoretical value obtained from the amount of the raw materials. It is a copolymer that has been

(Synthesis of polymer compound ET1)
After making the inside of reaction container into inert gas atmosphere, high molecular compound ET1a (200 mg), tetrahydrofuran (20 mL), and ethanol (20 mL) were added, and it heated at 55 degreeC. After that, cesium hydroxide (200 mg) dissolved in water (2 mL) was added thereto, and the mixture was stirred at 55°C for 6 hours. Then, after cooling to room temperature, a solid was obtained by concentrating under reduced pressure. The resulting solid was washed with water and then dried under reduced pressure to obtain polymer compound ET1 (150 mg, pale yellow solid). From the NMR spectrum of the obtained polymer compound ET1, it was confirmed that the signal derived from the ethyl group at the ethyl ester site of the polymer compound ET1a completely disappeared.

<Synthesis of polymer compound ET2>
(Synthesis of polymer compound ET2a)
Polymer compound ET2a is compound ET2-1 synthesized according to the method described in WO 2012/011418, and compound ET2-2 synthesized according to the method described in WO 2012/011418. Using, it was synthesized according to the method described in International Publication No. 2012/011418.

Mn of the polymer compound ET2a was 1.3×10 ⁴ .

The polymer compound ET2a is composed of structural units derived from the compound ET2-1 and structural units derived from the compound ET2-2 at a molar ratio of 50:50, according to the theoretical values obtained from the amounts of the raw materials. It is a copolymer that has been

(Synthesis of polymer compound ET2)
Polymer compound ET2 was obtained in the same manner as in (Synthesis of polymer compound ET1) except that "polymer compound ET2a" was used instead of "polymer compound ET1a" in (synthesis of polymer compound ET1). rice field. From the NMR spectrum of the polymer compound ET2 obtained, it was confirmed that the signal derived from the ethyl group in the ethyl ester moiety of the polymer compound ET2a completely disappeared.

<Synthesis of polymer compound ET3>
(Synthesis of polymer compound ET3a)
Polymer compound ET3a is synthesized according to the method described in WO 2015/159932 using compound M7 and compound ET2-2 synthesized according to the method described in WO 2012/011418. bottom.

Mn of the polymer compound ET3a was 1.1×10 ⁴ .

In the polymer compound ET3a, the theoretical value obtained from the amount of the charged raw material was composed of structural units derived from the compound M7 and structural units derived from the compound ET2-2 at a molar ratio of 50:50. It is a copolymer.

(Synthesis of polymer compound ET3)
Polymer compound ET3 was obtained in the same manner as in (Synthesis of polymer compound ET1), except that "polymer compound ET3a" was used instead of "polymer compound ET1a" in (synthesis of polymer compound ET1). rice field. From the NMR spectrum of the polymer compound ET3 obtained, it was confirmed that the signal derived from the ethyl group in the ethyl ester portion of the polymer compound ET3a had completely disappeared.

<Synthesis of polymer compound ET4>
(Synthesis of polymer compound ET4a)
Polymer compound ET4a was synthesized according to the method described in WO 2015/159932 using compound M4 and compound ET1-2 synthesized according to the method described in JP-A-2012-33845.

Mn of the polymer compound ET4a was 3.2×10 ⁴ .

In the polymer compound ET4a, the theoretical value obtained from the amount of the charged raw material was composed of structural units derived from the compound M4 and structural units derived from the compound ET1-2 at a molar ratio of 50:50. It is a copolymer.

(Synthesis of polymer compound ET4)
Polymer compound ET4 was obtained in the same manner as in (Synthesis of polymer compound ET1) except that "polymer compound ET4a" was used instead of "polymer compound ET1a" in (synthesis of polymer compound ET1). rice field. From the NMR spectrum of the obtained polymer compound ET4, it was confirmed that the signal derived from the ethyl group of the ethyl ester site of the polymer compound ET4a completely disappeared.

<Synthesis of polymer compound ET5>
Polymer compound ET5 was synthesized using compound M4, compound M5 and compound M6 according to the method described in International Publication No. 2015/008851.
The polymer compound ET5 had an Mn of 8.5×10 ⁴ and an Mw of 2.2×10 ⁵ .
In the polymer compound ET5, the theoretical value obtained from the amount of the charged raw material is that the structural unit derived from the compound M4, the structural unit derived from the compound M5, and the structural unit derived from the compound M6 are 50: It is a copolymer made up of a 26:24 molar ratio.

<Example D1> Production and evaluation of light emitting device D1 (formation of anode and hole injection layer)
An anode was formed by attaching an ITO film with a thickness of 45 nm to a glass substrate by a sputtering method. On the anode, ND-3202 (manufactured by Nissan Chemical Industries, Ltd.), which is a hole injection material, was formed into a film with a thickness of 35 nm by a spin coating method to form a coating film. The substrate on which the coating film was formed was heated on a hot plate at 50° C. for 3 minutes in an air atmosphere, and further heated at 230° C. for 15 minutes to form a hole injection layer.

(Formation of second layer)
A polymer compound HTL-1 was dissolved in xylene at a concentration of 0.7% by mass. Using the obtained xylene solution, a film having a thickness of 20 nm was formed on the hole injection layer by a spin coating method, and heated on a hot plate at 180° C. for 60 minutes in a nitrogen gas atmosphere. 2 layers (hole transport layers) were formed. By this heating, the polymer compound HTL-1 was in a crosslinked state.

(Formation of first layer)
Compound H1, metal complex MC1 and compound B1 (compound H1/metal complex MC1/compound B1=73 mass %/25 mass %/2 mass %) were dissolved in toluene at a concentration of 1.8 mass %. Using the obtained toluene solution, a film having a thickness of 60 nm was formed on the second layer by spin coating, and the first layer ( light-emitting layer) was formed.

(Formation of third layer)
The polymer compound ET1 was dissolved in 2,2,3,3,4,4,5,5-octafluoro-1-pentanol at a concentration of 0.4% by mass. Using the obtained 2,2,3,3,4,4,5,5-octafluoro-1-pentanol solution, a film having a thickness of 20 nm was formed on the first layer by spin coating. A third layer (electron transport layer) was formed by heating at 130° C. for 10 minutes in a nitrogen gas atmosphere.

(Formation of cathode)
After reducing the pressure of the substrate on which the electron transport layer was formed to 1.0 × 10 ^-4 Pa or less in a vapor deposition machine, as a cathode, sodium fluoride was deposited on the light emitting layer to about 4 nm, and then on the sodium fluoride layer. About 80 nm of aluminum was vapor-deposited on the substrate. After vapor deposition, the substrate on which the cathode was formed was sealed with a glass substrate to produce a light-emitting device D1.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D1. Luminous efficiency [lm/W] at 400 cd/m ² and CIE chromaticity coordinates were measured.

<Example D2> Production and Evaluation of Light Emitting Device D2 Except for using “polymer compound HTL-2” in place of “polymer compound HTL-1” in (formation of second layer) of Example D1. A light-emitting device D2 was produced in the same manner as in Example D1.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D2. Luminous efficiency [lm/W] at 400 cd/m ² and CIE chromaticity coordinates were measured.

<Comparative Example CD1> Fabrication and Evaluation of Light-Emitting Device CD1 A light-emitting device CD1 was fabricated in the same manner as in Example D1, except that (formation of the third layer) of Example D1 was not performed.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element CD1. Luminous efficiency [lm/W] at 400 cd/m ² and CIE chromaticity coordinates were measured.

<Comparative Example CD2> Production and Evaluation of Light-Emitting Device CD2 Except for using “Low Molecular Compound HTL-3” instead of “High Molecular Compound HTL-1” in Example D1 (Formation of Second Layer) A light-emitting device CD2 was fabricated in the same manner as in Example D1.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element CD2. Luminous efficiency [lm/W] at 400 cd/m ² and CIE chromaticity coordinates were measured.

Table 6 shows the results of Examples D1-D2 and Comparative Examples CD1-CD2. The relative value of the luminous efficiency of the light-emitting element D1 is shown when the luminous efficiency of the light-emitting element CD1 is set to 1.00.

<Example D3> Production and evaluation of light emitting device D3 (formation of anode and hole injection layer)
An anode was formed by attaching an ITO film with a thickness of 45 nm to a glass substrate by a sputtering method. On the anode, ND-3202 (manufactured by Nissan Chemical Industries, Ltd.), which is a hole injection material, was formed into a film with a thickness of 35 nm by a spin coating method to form a coating film. The substrate on which the coating film was formed was heated on a hot plate at 50° C. for 3 minutes in an air atmosphere, and further heated at 230° C. for 15 minutes to form a hole injection layer.

(Formation of second layer)
A polymer compound HTL-1 was dissolved in xylene at a concentration of 0.7% by mass. Using the obtained xylene solution, a film having a thickness of 20 nm was formed on the hole injection layer by a spin coating method, and heated on a hot plate at 180° C. for 60 minutes in a nitrogen gas atmosphere. 2 layers (hole transport layers) were formed. By this heating, the polymer compound HTL-1 was in a crosslinked state.

(Formation of first layer)
Compound H1, metal complex MC2 and compound B1 (compound H1/metal complex MC2/compound B1=73 mass %/25 mass %/2 mass %) were dissolved in toluene at a concentration of 1.8 mass %. Using the obtained toluene solution, a film having a thickness of 60 nm was formed on the second layer by spin coating, and the first layer ( light-emitting layer) was formed.

(Formation of third layer)
The polymer compound ET1 was dissolved in 2,2,3,3,4,4,5,5-octafluoro-1-pentanol at a concentration of 0.4% by mass. Using the obtained 2,2,3,3,4,4,5,5-octafluoro-1-pentanol solution, a film having a thickness of 20 nm was formed on the first layer by spin coating. A third layer (electron transport layer) was formed by heating at 130° C. for 10 minutes in a nitrogen gas atmosphere.

(Formation of cathode)
After reducing the pressure of the substrate on which the electron transport layer was formed to 1.0×10 ⁻⁴ Pa or less in a vapor deposition machine, about 4 nm of sodium fluoride was deposited on the electron transport layer as a cathode, and then the sodium fluoride layer was deposited. About 80 nm of aluminum was evaporated on top. After vapor deposition, the substrate on which the cathode was formed was sealed with a glass substrate to produce a light-emitting element D3.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D3. Luminous efficiency [lm/W] at 100 cd/m ² and CIE chromaticity coordinates were measured.

<Example D4> Production and Evaluation of Light-Emitting Device D4 Example D3 except that "polymer compound ET2" was used instead of "polymer compound ET1" in (formation of the third layer) of Example D3. A light-emitting device D4 was fabricated in the same manner as above.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D4. Luminous efficiency [lm/W] at 100 cd/m ² and CIE chromaticity coordinates were measured.

<Example D5> Production and Evaluation of Light-Emitting Device D5 Example D3 except that "polymer compound ET3" was used instead of "polymer compound ET1" in (formation of the third layer) of Example D3. A light-emitting device D5 was fabricated in the same manner as above.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D5. Luminous efficiency [lm/W] at 100 cd/m ² and CIE chromaticity coordinates were measured.

<Example D6> Production and Evaluation of Light-Emitting Element D6 Example D3 except that "polymer compound ET4" was used instead of "polymer compound ET1" in (formation of the third layer) of Example D3. A light-emitting device D6 was fabricated in the same manner as above.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D6. Luminous efficiency [lm/W] at 100 cd/m ² and CIE chromaticity coordinates were measured.

<Comparative Example CD3> Production and Evaluation of Light-Emitting Element CD3 A light-emitting element CD3 was produced in the same manner as in Example D3, except that (formation of the third layer) of Example D3 was not performed.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element CD3. Luminous efficiency [lm/W] at 100 cd/m ² and CIE chromaticity coordinates were measured.

Table 7 shows the results of Examples D3 to D6 and Comparative Example CD3. The relative values of the luminous efficiencies of the light-emitting elements D3 to D6 are shown when the luminous efficiency of the light-emitting element CD3 is set to 1.00.

<Example D7> Production and evaluation of light emitting device D7 (formation of anode and hole injection layer)
An anode was formed by attaching an ITO film with a thickness of 45 nm to a glass substrate by a sputtering method. On the anode, ND-3202 (manufactured by Nissan Chemical Industries, Ltd.), which is a hole injection material, was formed into a film with a thickness of 35 nm by a spin coating method to form a coating film. The substrate on which the coating film was formed was heated on a hot plate at 50° C. for 3 minutes in an air atmosphere, and further heated at 230° C. for 15 minutes to form a hole injection layer.

(Formation of second layer)
A polymer compound HTL-1 was dissolved in xylene at a concentration of 0.7% by mass. Using the obtained xylene solution, a film having a thickness of 20 nm was formed on the hole injection layer by a spin coating method, and heated on a hot plate at 180° C. for 60 minutes in a nitrogen gas atmosphere. 2 layers (hole transport layers) were formed. By this heating, the polymer compound HTL-1 was in a crosslinked state.

(Formation of first layer)
Polymer compound HP1, metal complex MC1 and compound B1 (polymer compound HP1/metal complex MC1/compound B1=73% by mass/25% by mass/2% by mass) were dissolved in chlorobenzene at a concentration of 1.6% by mass. rice field. Using the obtained chlorobenzene solution, a film having a thickness of 60 nm was formed on the second layer by spin coating, and the first layer ( light-emitting layer) was formed.

(Formation of third layer)
The polymer compound ET1 was dissolved in 2,2,3,3,4,4,5,5-octafluoro-1-pentanol at a concentration of 0.4% by mass. Using the obtained 2,2,3,3,4,4,5,5-octafluoro-1-pentanol solution, a film having a thickness of 20 nm was formed on the first layer by spin coating. A third layer (electron transport layer) was formed by heating at 130° C. for 10 minutes in a nitrogen gas atmosphere.

(Formation of cathode)
After reducing the pressure of the substrate on which the electron transport layer was formed to 1.0×10 ⁻⁴ Pa or less in a vapor deposition machine, about 4 nm of sodium fluoride was deposited on the electron transport layer as a cathode, and then the sodium fluoride layer was deposited. About 80 nm of aluminum was evaporated on top. After vapor deposition, the substrate on which the cathode was formed was sealed with a glass substrate to produce a light-emitting element D7.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D7. Luminous efficiency [lm/W] at 400 cd/m ² and CIE chromaticity coordinates were measured.

<Example D8> Production and Evaluation of Light Emitting Device D8 Example D7 except that "polymer compound ET2" was used instead of "polymer compound ET1" in (formation of the third layer) of Example D7. A light-emitting device D8 was fabricated in the same manner as in the above.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D8. Luminous efficiency [lm/W] at 400 cd/m ² and CIE chromaticity coordinates were measured.

<Example D9> Production and Evaluation of Light-Emitting Device D9 Example D7 except that "polymer compound ET3" was used instead of "polymer compound ET1" in (formation of the third layer) of Example D7. A light-emitting device D9 was fabricated in the same manner as above.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D9. Luminous efficiency [lm/W] at 400 cd/m ² and CIE chromaticity coordinates were measured.

<Example D10> Production and Evaluation of Light-Emitting Device D10 Example D7 except that "polymer compound ET4" was used instead of "polymer compound ET1" in (formation of the third layer) of Example D7. A light-emitting device D10 was produced in the same manner as above.

(Evaluation of Light Emitting Element)
EL emission was observed by applying a voltage to the light emitting element D10. Luminous efficiency [lm/W] at 400 cd/m ² and CIE chromaticity coordinates were measured.

<Example D11> Production and evaluation of light-emitting element D11 In the same manner as in Example D7, except that (Formation of the third layer) of Example D7 was changed to the following (Formation of the third layer-D11), A light-emitting element D11 was produced.
(Formation of the third layer-D11)
A polymer compound ET5 was dissolved in xylene at a concentration of 0.6% by mass. Using the obtained xylene solution, a film with a thickness of 20 nm was formed on the first layer by a spin coating method, and the third layer (electron transport layer) was formed.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D11. Luminous efficiency [lm/W] at 400 cd/m ² and CIE chromaticity coordinates were measured.

<Comparative Example CD4> Production and Evaluation of Light-Emitting Element CD4 A light-emitting element CD4 was produced in the same manner as in Example D7, except that (formation of the third layer) of Example D7 was not performed.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element CD4. Luminous efficiency [lm/W] at 400 cd/m ² and CIE chromaticity coordinates were measured.

Table 8 shows the results of Examples D7 to D11 and Comparative Example CD4. The relative values of the luminous efficiencies of the light-emitting elements D7 to D11 are shown when the luminous efficiency of the light-emitting element CD4 is set to 1.00.

<Example D12> Production and evaluation of light emitting device D12 (formation of anode and hole injection layer)
An anode was formed by attaching an ITO film with a thickness of 45 nm to a glass substrate by a sputtering method. On the anode, ND-3202 (manufactured by Nissan Chemical Industries, Ltd.), which is a hole injection material, was formed into a film with a thickness of 35 nm by a spin coating method to form a coating film. The substrate on which the coating film was formed was heated on a hot plate at 50° C. for 3 minutes in an air atmosphere, and further heated at 230° C. for 15 minutes to form a hole injection layer.

(Formation of third layer)
A polymer compound HTL-1 was dissolved in xylene at a concentration of 0.4% by mass. Using the obtained xylene solution, a film having a thickness of 10 nm was formed on the hole injection layer by a spin coating method, and heated on a hot plate at 180° C. for 60 minutes in a nitrogen gas atmosphere to obtain a second film. 3 layers (hole transport layers) were formed. By this heating, the polymer compound HTL-1 was in a crosslinked state.

(Formation of second layer)
A polymer compound HTL-4 was dissolved in xylene at a concentration of 0.4% by mass. Using the obtained xylene solution, a film having a thickness of 10 nm was formed on the third layer by a spin coating method, and heated on a hot plate at 180° C. for 60 minutes in a nitrogen gas atmosphere to form a third layer. 2 layers (hole transport layers) were formed. By this heating, the polymer compound HTL-4 was in a crosslinked state.

(Formation of first layer)
Compound H1, metal complex MC1 and compound B1 (compound H1/metal complex MC1/compound B1=73 mass %/25 mass %/2 mass %) were dissolved in toluene at a concentration of 1.8 mass %. Using the obtained toluene solution, a film having a thickness of 60 nm was formed on the second layer by spin coating, and the first layer ( light-emitting layer) was formed.

(Formation of cathode)
After reducing the pressure of the substrate on which the light-emitting layer is formed to 1.0×10 ⁻⁴ Pa or less in a vapor deposition machine, sodium fluoride of about 4 nm is deposited on the light-emitting layer as a cathode, and then on the sodium fluoride layer. About 80 nm of aluminum was evaporated. After vapor deposition, the substrate on which the cathode was formed was sealed with a glass substrate to produce a light-emitting device D12.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D12. Luminous efficiency [lm/W] at 1000 cd/m ² and CIE chromaticity coordinates were measured.

<Example D13> Production and evaluation of light-emitting element D13 Instead of "polymer compound HTL-1" in (formation of third layer) of Example D12, "polymer compound HTL-5" was used, and ( A light-emitting device D13 was fabricated in the same manner as in Example D12, except that "polymer compound HTL-1" was used instead of "polymer compound HTL-4" in Formation of second layer).

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D13. Luminous efficiency [lm/W] at 1000 cd/m ² and CIE chromaticity coordinates were measured.

<Example D14> Production and evaluation of light-emitting device D14 Except for using "polymer compound HTL-5" in place of "polymer compound HTL-1" in Example D12 (formation of third layer) A light-emitting device D14 was produced in the same manner as in Example D12.

(Evaluation of Light Emitting Element)
EL emission was observed by applying a voltage to the light emitting element D14. Luminous efficiency [lm/W] at 1000 cd/m ² and CIE chromaticity coordinates were measured.

<Example D15> Production and evaluation of light-emitting device D15 Instead of "polymer compound HTL-1" in (formation of third layer) of Example D12, "polymer compound HTL-6" was used, and ( A light-emitting device D15 was fabricated in the same manner as in Example D12, except that "polymer compound HTL-1" was used instead of "polymer compound HTL-4" in Formation of second layer).

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D15. Luminous efficiency [lm/W] at 1000 cd/m ² and CIE chromaticity coordinates were measured.

<Example D16> Production and evaluation of light-emitting device D16 Except for using "polymer compound HTL-6" in place of "polymer compound HTL-1" in Example D12 (formation of third layer) A light-emitting device D16 was produced in the same manner as in Example D12.

(Evaluation of Light Emitting Element)
EL emission was observed by applying a voltage to the light emitting element D16. Luminous efficiency [lm/W] at 1000 cd/m ² and CIE chromaticity coordinates were measured.

<Example D17> Production and Evaluation of Light Emitting Device D17 In place of “polymer compound HTL-1” in (formation of third layer) of Example D12, “polymer compound HTL-5” was used ( A light-emitting device D17 was fabricated in the same manner as in Example D12, except that "polymer compound HTL-6" was used in place of "polymer compound HTL-4" in Formation of second layer).

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element D17. Luminous efficiency [lm/W] at 1000 cd/m ² and CIE chromaticity coordinates were measured.

<Example D18> Production and Evaluation of Light Emitting Device D18 In place of “polymer compound HTL-1” in (formation of third layer) of Example D12, “polymer compound HTL-6” was used, and ( A light-emitting device D18 was fabricated in the same manner as in Example D12, except that "polymer compound HTL-5" was used instead of "polymer compound HTL-4" in Formation of second layer).

(Evaluation of Light Emitting Element)
EL emission was observed by applying a voltage to the light emitting element D18. Luminous efficiency [lm/W] at 1000 cd/m ² and CIE chromaticity coordinates were measured.

<Comparative Example CD5> Preparation and evaluation of light-emitting element CD5 The (formation of the third layer) of Example D12 was not performed, and the (formation of the second layer) was changed to the following (formation of the second layer-CD5). A light-emitting element CD5 was fabricated in the same manner as in Example D12 except for the above.
(Formation of second layer CD-5)
A polymer compound HTL-6 was dissolved in xylene at a concentration of 0.7% by mass. Using the obtained xylene solution, a film having a thickness of 20 nm was formed on the hole injection layer by a spin coating method, and heated on a hot plate at 180° C. for 60 minutes in a nitrogen gas atmosphere. 2 layers (hole transport layers) were formed. By this heating, the polymer compound HTL-6 was in a crosslinked state.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element CD5. Luminous efficiency [lm/W] at 1000 cd/m ² and CIE chromaticity coordinates were measured.

<Comparative Example CD6> Production and Evaluation of Light-Emitting Element CD6 The (formation of the third layer) of Example D12 was not performed, and the (formation of the second layer) was changed to the following (formation of the second layer-CD6). A light-emitting device CD6 was fabricated in the same manner as in Example D12 except for the above.
(Formation of second layer CD-6)
A polymer compound HTL-5 was dissolved in xylene at a concentration of 0.7% by mass. Using the obtained xylene solution, a film having a thickness of 20 nm was formed on the hole injection layer by a spin coating method, and heated on a hot plate at 180° C. for 60 minutes in a nitrogen gas atmosphere. 2 layers (hole transport layers) were formed. By this heating, the polymer compound HTL-5 was in a crosslinked state.

(Evaluation of Light Emitting Element)
EL light emission was observed by applying a voltage to the light emitting element CD6. Luminous efficiency [lm/W] at 1000 cd/m ² and CIE chromaticity coordinates were measured.

Table 9 shows the results of Examples D12 to D18 and Comparative Examples CD5 to CD6. The relative values of the luminous efficiencies of the light-emitting elements D12 to D18 and the light-emitting element CD5 are shown when the luminous efficiency of the light-emitting element CD6 is set to 1.00.

As is clear from Tables 6 to 9, the light-emitting device of Example having an anode, a cathode, and a first layer, a second layer, and a third layer provided between the anode and the cathode is superior in luminous efficiency to the light emitting element of the comparative example which does not have the third layer.
The CIE chromaticity coordinates of the luminescence observed from the light-emitting elements of Examples and Comparative Examples are about the same, and the influence of differences in the wavelengths of luminescence, etc., is negligible in the measurement of the luminous efficiency. It is.

Claims (17)

A light-emitting device comprising an anode, a cathode, and a first layer, a second layer, and a third layer provided between the anode and the cathode,
The first layer is
selected from the group consisting of a metal complex represented by formula (1) and a polymer compound (A) containing a structural unit having a group obtained by removing one or more hydrogen atoms from the metal complex represented by formula (1) and at least one
A low-molecular-weight compound (B) having a condensed heterocyclic skeleton (b) containing a boron atom and at least one selected from the group consisting of an oxygen atom, a sulfur atom, a selenium atom, an ^sp3 carbon atom and a nitrogen atom in the ring and at least one selected from the group consisting of a polymer compound (B) containing a structural unit having a group obtained by removing one or more hydrogen atoms from the low-molecular-weight compound (B),
is a layer containing
wherein the second layer and the third layer are a structural unit represented by formula (ET-1), a structural unit represented by formula (ET-2), a structural unit represented by formula (X); A polymer containing at least one structural unit selected from the group consisting of structural units represented by the formula (Y), structural units represented by the formula (Z), and structural units represented by the formula (Z′) A light-emitting element, which is a layer formed using a compound.

[In the formula,
M represents a rhodium atom, a palladium atom, an iridium atom or a platinum atom.
ⁿ¹ represents an integer of 1 or more, and ⁿ² represents an integer of 0 or more. However, n ¹ +n ² is 3 when M is a rhodium atom or an iridium atom, and n ¹ +n ² is 2 when M is a palladium atom or a platinum atom.
E ¹ and E ² each independently represent a carbon atom or a nitrogen atom. When multiple E ¹ and E ² are present, they may be the same or different.
Ring L ¹ represents an aromatic heterocycle, and the ring may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple rings L ¹ are present, they may be the same or different.
Ring ^L2 represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and these rings may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When there is more than one ring ^L2 , they may be the same or different.
The substituent that ring L ¹ may have and the substituent that ring L ² may have may be the same or different, and are bonded to each other to form a ring together with the atoms to which they are bonded. may be formed.
A ¹ -G ¹ -A ² represents an anionic bidentate ligand. A ¹ and A ² each independently represent a carbon atom, an oxygen atom or a nitrogen atom, and these atoms may be atoms constituting a ring. G ¹ represents a single bond or an atomic group forming a bidentate ligand together with A ¹ and A ² . When multiple A ¹ -G ¹ -A ² are present, they may be the same or different. ]

[In the formula,
nE1 represents an integer of 1 or more.
Ar ^E1 represents an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent.
R ^E1 represents a group represented by formula (ES-1). When multiple R ^E1 are present, they may be the same or different. ]

-R ^E3 - {(Q ^E1 ) _nE3 - Y ^E1 (M ^E1 ) _aE1 (Z ^E1 ) _bE1 } _mE1 (ES-1)
[In the formula,
nE3 and bE1 each independently represent an integer of 0 or greater, and aE1 and mE1 each independently represent an integer of 1 or greater. When multiple nE3, aE1 and bE1 are present, they may be the same or different. However, mE1 is 1 when R ^E3 is a single bond. aE1 and bE1 are selected so that the charge of the group represented by formula (ES-1) is zero.
R ^E3 represents a single bond, a hydrocarbon group, a heterocyclic group or O—R ^E3 ' (R ^E3 ' represents a hydrocarbon group or a heterocyclic group), and these groups have a substituent; may
Q ^E1 represents an alkylene group, a cycloalkylene group, an arylene group, an oxygen atom or a sulfur atom, and these groups may have a substituent. When multiple Q ^E1 are present, they may be the same or different.
Y ^E1 represents -CO ₂ ^- , -SO ₃ ^- , -SO ₂ ^- or -PO ₃ ^2- . When multiple Y ^E1 are present, they may be the same or different.
M ^E1 represents an alkali metal cation, an alkaline earth metal cation or an ammonium cation, and the ammonium cation may have a substituent. When multiple M ^E1 are present, they may be the same or different.
Z ^E1 is F ⁻ , Cl ⁻ , Br ⁻ , I ⁻ , OH ⁻ , B(R ^E4 ) ₄ ⁻ , R ^E4 SO ₃ ⁻ , R ^E4 COO ⁻ , NO ₃ ⁻ , SO ₄ ²⁻ , HSO ₄ ⁻ , PO ₄ ^3- , HPO ₄ ^2- , H ₂ PO ₄ ^- , BF ₄ ^- or PF ₆ ^- . R ^E4 represents an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent. When multiple Z ^E1 are present, they may be the same or different. ]

[In the formula,
nE2 represents an integer of 1 or more.
Ar ^E2 represents an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent.
R ^E2 represents a group represented by formula (ES-2). When multiple R ^E2 are present, they may be the same or different. ]
-R ^E5 - {(Q ^E2 ) _nE4 - Y ^E2 (M ^E2 ) _aE2 (Z ^E2 ) _bE2 } _mE2 (ES-2)
[In the formula,
nE4 and bE2 each independently represent an integer of 0 or greater, and aE2 and mE2 each independently represent an integer of 1 or greater. When multiple nE4, aE2 and bE2 are present, they may be the same or different. However, mE2 is 1 when R ^E5 is a single bond. aE2 and bE2 are selected so that the charge of the group represented by formula (ES-2) is zero.
R ^E5 represents a single bond, a hydrocarbon group, a heterocyclic group or O—R ^E5 ' (R ^E5 ' represents a hydrocarbon group or a heterocyclic group), and these groups have a substituent; may
Q ^E2 represents an alkylene group, a cycloalkylene group, an arylene group, an oxygen atom or a sulfur atom, and these groups may have a substituent. When multiple Q ^E2 are present, they may be the same or different.
Y ^E2 represents -C ⁺ R ^E6 ₂ , -N ⁺ R ^E6 ₃ , -P ⁺ R ^E6 ₃ , -S ⁺ R ^E6 ₂ or -I ⁺ R ^E6 ₂ . R ^E6 represents a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent. A plurality of R ^E6 may be the same or different. When multiple Y ^E2 are present, they may be the same or different.
M ^E2 is F ⁻ , Cl ⁻ , Br ⁻ , I ⁻ , OH ⁻ , B(R ^E7 ) ₄ ⁻ , R ^E7 SO ₃ ⁻ , R ^E7 COO ⁻ , BF ₄ ⁻ , SbCl ₆ ⁻ or SbF ₆ ⁻ ; show. R ^E7 represents an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent.
When multiple M ^E2 are present, they may be the same or different.
Z ^E2 represents an alkali metal cation or an alkaline earth metal cation. When multiple Z ^E2 are present, they may be the same or different. ]

[In the formula,
a ^X1 and a ^X2 each independently represent an integer of 0 or more.
Ar ^{1 X1} and Ar 2 ^X3 each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
Ar ^X2 and Ar ^X4 each independently represent an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded; and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple Ar ^X2 are present, they may be the same or different. When multiple Ar ^X4 are present, they may be the same or different.
R ^X1 , R ^X2 and R ^X3 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple R ^X2 are present, they may be the same or different. When multiple R ^X3 are present, they may be the same or different. ]

[Wherein, Ar ^Y represents an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded, The group may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. ]

[In the formula,
n represents an integer of 1 or more.
nA represents an integer of 0 or more. When multiple nAs are present, they may be the same or different.
Ar ^Z represents a hydrocarbon group, a heterocyclic group, or a group in which at least one hydrocarbon group and at least one heterocyclic group are directly bonded, and these groups may have a substituent good. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
L ^A represents an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, a group represented by -N(R')-, an oxygen atom or a sulfur atom, and these groups have a substituent. You may have When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. R' represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple L ^A are present, they may be the same or different.
X represents a cross-linking group. When there are multiple X's, they may be the same or different. ]

[In the formula,
mA, m and c each independently represent an integer of 0 or more. When multiple mA are present, they may be the same or different. When there are multiple m's, they may be the same or different.
Ar ⁵ represents a hydrocarbon group, a heterocyclic group, or a group in which at least one hydrocarbon group and at least one heterocyclic group are directly bonded, and these groups may have a substituent good. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple Ar ⁵ are present, they may be the same or different.
Ar ⁴ and Ar ⁶ each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
K ^A represents an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, a group represented by -N(R'')-, an oxygen atom or a sulfur atom, and these groups are substituents. may have. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. R'' represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple K ^A are present, they may be the same or different.
X' represents a hydrogen atom, a bridging group, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When there are multiple X's, they may be the same or different. However, at least one X' is a bridging group. ] The ring L ¹ is an aromatic heterocyclic ring containing a 5-membered ring or an aromatic heterocyclic ring containing a 6-membered ring, these rings may have a substituent, and ring L ² is a 5-membered heterocyclic ring. An aromatic hydrocarbon ring containing a membered ring or a 6-membered ring, or an aromatic heterocyclic ring containing a 5-membered ring or a 6-membered ring, and these rings may have a substituent, according to claim 1 The described light-emitting device. The ring L ¹ is a pyridine ring, a diazabenzene ring, an azanaphthalene ring, a diazanaphthalene ring, a diazole ring or a triazole ring, these rings may have a substituent, and the ring L ² is , a benzene ring, a pyridine ring, or a diazabenzene ring, and these rings may have a substituent. The ring L ¹ is a diazole ring or a triazole ring, which may have a substituent, and the ring L ² is a benzene ring, which has a substituent 4. The light-emitting device according to claim 3, which may be 2. The light-emitting device according to claim 1, wherein said condensed heterocyclic skeleton (b) contains a boron atom and at least one selected from the group consisting of an oxygen atom, a sulfur atom and a nitrogen atom in the ring. 6. The light-emitting device according to claim 5, wherein said condensed heterocyclic skeleton (b) contains a boron atom and a nitrogen atom in the ring. Claim 1, wherein the low-molecular-weight compound (B) is a compound represented by formula (1-1), a compound represented by formula (1-2), or a compound represented by formula (1-3). The light-emitting device according to .

[In the formula,
Ar ¹ , Ar ² and Ar ³ each independently represent an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
Y ¹ represents an oxygen atom, a sulfur atom, a selenium atom, a group represented by -N(Ry)-, an alkylene group or a cycloalkylene group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
Y ² and Y ³ each independently represent a single bond, an oxygen atom, a sulfur atom, a selenium atom, a group represented by -N(Ry)-, a group represented by -B(Ry)-, an alkylene group, It represents a cycloalkylene group, an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
Ry represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When two or more Ry are present, they may be the same or different.
Y ¹ and Ar ¹ may be directly bonded or bonded via a divalent group to form a ring. Y ¹ and Ar ² may be directly bonded or bonded via a divalent group to form a ring. Y ² and Ar ¹ may be directly bonded or bonded via a divalent group to form a ring. Y ² and Ar ³ may be directly bonded or bonded via a divalent group to form a ring. Y ³ and Ar ² may be directly bonded or bonded via a divalent group to form a ring. Y ³ and Ar ³ may be directly bonded or bonded via a divalent group to form a ring. ] 8. The light-emitting device according to claim 7, wherein said Y ¹ , said Y ² and said Y ³ are an oxygen atom, a sulfur atom or a group represented by -N(Ry)-. 9. The light-emitting device according to claim 8, wherein said Y ¹ , said Y ² and said Y ³ are groups represented by -N(Ry)-. The second layer is a layer provided between the anode and the first layer, and
The second layer includes a structural unit represented by the formula (X), a structural unit represented by the formula (Y), a structural unit represented by the formula (Z), and a structural unit represented by the formula (Z′). 2. The light-emitting device according to claim 1, which is a layer formed using a polymer compound containing at least one structural unit selected from the group consisting of the structural units represented by: The third layer is a layer provided between the cathode and the first layer, and
The third layer contains at least one structural unit selected from the group consisting of structural units represented by the formula (ET-1) and structural units represented by the formula (ET-2). 11. The light-emitting device according to claim 10, which is a layer formed using a molecular compound. the second layer is a layer provided between the anode and the first layer;
the third layer is a layer provided between the cathode and the first layer;
The third layer and the first layer are adjacent, and
12. The light emitting device according to claim 11, wherein said second layer and said first layer are adjacent. The second layer and the third layer are layers provided between the anode and the first layer, and
The second layer and the third layer are composed of the structural unit represented by the formula (X), the structural unit represented by the formula (Y), the structural unit represented by the formula (Z), and the structural unit represented by the formula (Z). 11. The light-emitting device according to claim 10, which is a layer formed using a polymer compound containing at least one structural unit selected from the group consisting of structural units represented by formula (Z'). the third layer is a layer provided between the anode and the second layer;
The third layer and the second layer are adjacent, and
14. The light emitting device according to claim 13, wherein said second layer and said first layer are adjacent. The light-emitting device according to any one of claims 1 and 10 to 14, wherein the cross-linking group is at least one cross-linking group selected from Group A of cross-linking groups.
(Crosslinking group A group)

[In the formula, R ^XL represents a methylene group, an oxygen atom or a sulfur atom, and n ^XL represents an integer of 0 to 5. When multiple R ^XL are present, they may be the same or different. When multiple ^nXL are present, they may be the same or different. *1 represents the binding position. These bridging groups may have substituents, and when there are multiple substituents, they may be the same or different, and are bonded to each other to form a ring together with the atoms to which they are bonded. may ] The first layer is at least selected from the group consisting of a compound represented by formula (H-1), and a structural unit represented by formula (X) and a structural unit represented by formula (Y) 10. The light emitting device according to any one of claims 1 to 9, further comprising at least one selected from the group consisting of polymer compounds containing one structural unit.

[In the formula,
Ar ^H1 and Ar ^H2 each independently represent an aryl group, a monovalent heterocyclic group or a substituted amino group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
n ^H1 represents an integer of 0 or more.
L ^H1 represents a divalent group, and the divalent group may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple L ^H1 are present, they may be the same or different, and they may be directly bonded to each other or bonded via a divalent group to form a ring.
Ar ^H1 and Ar ^H2 may be directly bonded or bonded via a divalent group to form a ring. L ^H1 and Ar ^H1 may be directly bonded or bonded via a divalent group to form a ring. L ^H1 and Ar ^H2 may be directly bonded or bonded via a divalent group to form a ring. ]

[In the formula,
a ^X1 and a ^X2 each independently represent an integer of 0 or more.
Ar ^{1 X1} and Ar 2 ^X3 each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded.
Ar ^X2 and Ar ^X4 each independently represent an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded; and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple Ar ^X2 are present, they may be the same or different. When multiple Ar ^X4 are present, they may be the same or different.
R ^X1 , R ^X2 and R ^X3 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When multiple R ^X2 are present, they may be the same or different. When multiple R ^X3 are present, they may be the same or different. ]

[Wherein, Ar ^Y represents an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded, The group may have a substituent. When there are multiple such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. ] Claims 1 to 3, wherein the first layer further contains at least one selected from the group consisting of a hole transport material, a hole injection material, an electron transport material, an electron injection material, a light emitting material and an antioxidant. Item 9. The light-emitting device according to any one of Item 9.