JP2024057116A - Organic electroluminescence element and electronic device - Google Patents

Abstract

[Problem] To provide an organic electroluminescence element with a long life. [Solution] An organic electroluminescence element having a first light-emitting layer 51 disposed between an anode 3 and a cathode 4, and a second light-emitting layer 52 disposed between the first light-emitting layer 51 and the cathode 4, the first light-emitting layer 51 containing a first host material and a first light-emitting compound, the second light-emitting layer 52 containing a second host material and a second light-emitting compound, a triplet energy T1 (H1) of the first host material and a triplet energy T1 (H2) of the second host material satisfy the relationship of mathematical formula (1), and an energy level LUMO (H2) of the lowest unoccupied molecular orbital of the second host material and an energy level LUMO (D2) of the lowest unoccupied molecular orbital of the second light-emitting compound satisfy the relationship of mathematical formula (2). T1(H1)<T1(H2) ... (Equation 1) |LUMO(D2)|-|LUMO(H2)|<0.74 eV ... (Equation 2) [Selected Figure] Figure 1

Description

The present invention relates to an organic electroluminescence element and an electronic device.

Organic electroluminescence elements (hereinafter sometimes referred to as "organic EL elements") are applied to full-color displays such as mobile phones and televisions. When a voltage is applied to an organic EL element, holes are injected from the anode into the light-emitting layer, and electrons are injected from the cathode into the light-emitting layer. Then, in the light-emitting layer, the injected holes and electrons recombine to form excitons. At this time, according to the statistical laws of electron spin, singlet excitons are generated at a rate of 25% and triplet excitons are generated at a rate of 75%.
In order to improve the performance of an organic EL element, for example, Patent Document 1 considers a technique for stacking a plurality of light-emitting layers. Also, Patent Document 2 describes a phenomenon in which a singlet exciton is generated by the collision and fusion of two triplet excitons (hereinafter, sometimes referred to as the triplet-triplet fusion = TTF phenomenon) in order to improve the performance of an organic EL element.
The performance of an organic EL element includes, for example, luminance, emission wavelength, chromaticity, luminous efficiency, driving voltage, and life span.

JP 2013-157552 A International Publication No. 2010/134350

The object of the present invention is to provide an organic electroluminescence element with a long life, and to provide an electronic device equipped with the organic electroluminescence element.

According to one aspect of the present invention, there is provided an organic electroluminescence device comprising an anode, a cathode, a first light-emitting layer disposed between the anode and the cathode, and a second light-emitting layer disposed between the first light-emitting layer and the cathode, the first light-emitting layer and the second light-emitting layer being disposed between the anode and the cathode in this order, the first light-emitting layer comprises a first host material, the second light-emitting layer comprises a second host material, the first host material and the second host material being different from each other, the first light-emitting layer comprises at least a first light-emitting compound, the second light-emitting layer comprises at least a second light-emitting compound, the first light-emitting compound and the second light-emitting compound are the same or different from each other, a triplet energy T 1 (H1) of the first host material and a triplet energy T 1 (H2) of the second host material are different from each other, and the triplet energy T 1 (H3) of the first host material and the triplet energy T 1 (H4) of the second host material are different from each other, and the triplet energy T 1 (H5) of the first host material and the triplet energy T 1 (H6) of the second host material are different from each other, and the triplet energy T 1 (H7) of the first host material and the triplet energy T 1 (H8) of the second host material are different from each other, and the triplet energy T 1 (H9) of the first host material and the triplet energy T 1 (H1) of the second host material are different from each other, and the triplet energy T 1 (H1) of the first host material and the triplet energy T 1 (H2) of the second host material are different from each other, and the triplet energy T ₁ (H3) of the first host material and the triplet energy T 1 (H4) of the second host material are different from each other, and the triplet energy T 1 (H5) of the second host material are different from each other, and the triplet energy T 1 (H6) of the first host material and the triplet energy T ₁ (H7) of and an energy level LUMO(H2) of a lowest unoccupied molecular orbital of the second host material and an energy level LUMO(D2) of a lowest unoccupied molecular orbital of the second light-emitting compound satisfy the relationship of the following mathematical formula (Math. 1):
T ₁ (H1) < T ₁ (H2) ... (Equation 1)
|LUMO(D2)|-|LUMO(H2)|<0.74 eV ... (Equation 2)

According to one aspect of the present invention, an electronic device is provided that includes an organic electroluminescence element according to one aspect of the present invention.

According to one aspect of the present invention, it is possible to provide an organic electroluminescence element having a long life. Also, according to another aspect of the present invention, it is possible to provide an electronic device equipped with the organic electroluminescence element.

1 is a diagram showing a schematic configuration of an example of an organic electroluminescence element according to an embodiment of the present invention. 1 shows PL spectra of light-emitting compounds used in the manufacture of organic electroluminescence devices according to examples. 1 shows a PL spectrum of a light-emitting compound used in the manufacture of an organic electroluminescence device of a comparative example.

[Definition]
In this specification, hydrogen atoms include isotopes having different numbers of neutrons, namely protium, deuterium, and tritium.

In this specification, in chemical structural formulas, any possible bonding position that is not explicitly indicated with a symbol such as "R" or "D" representing a deuterium atom is assumed to have a hydrogen atom, i.e., a protium atom, a deuterium atom, or a tritium atom, bonded thereto.

In this specification, the number of ring carbon atoms refers to the number of carbon atoms among the atoms constituting the ring itself of a compound having a structure in which atoms are bonded in a ring (for example, a monocyclic compound, a fused ring compound, a bridged compound, a carbocyclic compound, and a heterocyclic compound). When the ring is substituted with a substituent, the carbon contained in the substituent is not included in the number of ring carbon atoms. The "number of ring carbon atoms" described below is the same unless otherwise specified. For example, a benzene ring has 6 ring carbon atoms, a naphthalene ring has 10 ring carbon atoms, a pyridine ring has 5 ring carbon atoms, and a furan ring has 4 ring carbon atoms. For example, a 9,9-diphenylfluorenyl group has 13 ring carbon atoms, and a 9,9'-spirobifluorenyl group has 25 ring carbon atoms.
In addition, when a benzene ring is substituted with, for example, an alkyl group as a substituent, the number of carbon atoms of the alkyl group is not included in the number of ring carbon atoms of the benzene ring. Therefore, the number of ring carbon atoms of the benzene ring substituted with an alkyl group is 6. In addition, when a naphthalene ring is substituted with, for example, an alkyl group as a substituent, the number of carbon atoms of the alkyl group is not included in the number of ring carbon atoms of the naphthalene ring. Therefore, the number of ring carbon atoms of the naphthalene ring substituted with an alkyl group is 10.

In this specification, the number of ring atoms refers to the number of atoms constituting the ring itself of a compound (e.g., a monocyclic compound, a fused ring compound, a bridged compound, a carbocyclic compound, and a heterocyclic compound) having a structure in which atoms are bonded in a ring (e.g., a monocyclic ring, a fused ring, and a ring assembly). The number of ring atoms does not include atoms that do not constitute a ring (e.g., a hydrogen atom that terminates the bond of an atom constituting a ring) or atoms contained in a substituent when the ring is substituted with a substituent. The "number of ring atoms" described below is the same unless otherwise specified. For example, the number of ring atoms of a pyridine ring is 6, the number of ring atoms of a quinazoline ring is 10, and the number of ring atoms of a furan ring is 5. For example, the number of hydrogen atoms bonded to a pyridine ring or the number of atoms constituting a substituent is not included in the number of pyridine ring atoms. Therefore, the number of ring atoms of a pyridine ring to which a hydrogen atom or a substituent is bonded is 6. In addition, for example, the number of hydrogen atoms bonded to a carbon atom of a quinazoline ring or the atoms constituting a substituent is not included in the number of ring atoms of a quinazoline ring. Therefore, the number of ring atoms in the quinazoline ring to which the hydrogen atom or substituent is bonded is 10.

In this specification, the "carbon number XX to YY" in the expression "substituted or unsubstituted ZZ group having carbon numbers XX to YY" refers to the number of carbon atoms when the ZZ group is unsubstituted, and does not include the number of carbon atoms of the substituent when the ZZ group is substituted. Here, "YY" is larger than "XX", "XX" means an integer of 1 or more, and "YY" means an integer of 2 or more.

In this specification, the "atomic number XX to YY" in the expression "substituted or unsubstituted ZZ group having atomic number XX to YY" refers to the number of atoms when the ZZ group is unsubstituted, and does not include the number of atoms of the substituents when the ZZ group is substituted. Here, "YY" is larger than "XX", "XX" means an integer of 1 or more, and "YY" means an integer of 2 or more.

In this specification, the term "unsubstituted ZZ group" refers to the case where a "substituted or unsubstituted ZZ group" is an "unsubstituted ZZ group", and the term "substituted ZZ group" refers to the case where a "substituted or unsubstituted ZZ group" is a "substituted ZZ group".
In the present specification, "unsubstituted" in the case of "a substituted or unsubstituted ZZ group" means that a hydrogen atom in the ZZ group is not replaced with a substituent. The hydrogen atom in the "unsubstituted ZZ group" is a protium atom, a deuterium atom, or a tritium atom.
In the present specification, "substitution" in the case of "a substituted or unsubstituted ZZ group" means that one or more hydrogen atoms in the ZZ group are replaced with a substituent. Similarly, "substitution" in the case of "a BB group substituted with an AA group" means that one or more hydrogen atoms in the BB group are replaced with an AA group.

"Substituents Described Herein"
The substituents described in this specification will be described below.

The "unsubstituted aryl group" described in this specification has 6 to 50 ring carbon atoms, preferably 6 to 30, and more preferably 6 to 18 ring carbon atoms, unless otherwise specified in this specification.
The "unsubstituted heterocyclic group" described in this specification has 5 to 50 ring atoms, preferably 5 to 30, and more preferably 5 to 18 ring atoms, unless otherwise specified in this specification.
The "unsubstituted alkyl group" described in this specification has 1 to 50 carbon atoms, preferably 1 to 20 carbon atoms, and more preferably 1 to 6 carbon atoms, unless otherwise specified in this specification.
The number of carbon atoms in the "unsubstituted alkenyl group" described in this specification is, unless otherwise specified in this specification, 2 to 50, preferably 2 to 20, and more preferably 2 to 6.
The number of carbon atoms in the "unsubstituted alkynyl group" described in this specification, unless otherwise specified in this specification, is 2 to 50, preferably 2 to 20, and more preferably 2 to 6.
The "unsubstituted cycloalkyl group" described in this specification has 3 to 50 ring carbon atoms, preferably 3 to 20, and more preferably 3 to 6 ring carbon atoms, unless otherwise specified in this specification.
The "unsubstituted arylene group" described in this specification has 6 to 50 ring carbon atoms, preferably 6 to 30, and more preferably 6 to 18 ring carbon atoms, unless otherwise specified in this specification.
The number of ring atoms in the “unsubstituted divalent heterocyclic group” described in this specification is 5 to 50, preferably 5 to 30, and more preferably 5 to 18, unless otherwise specified in this specification.
The "unsubstituted alkylene group" described in this specification has 1 to 50 carbon atoms, preferably 1 to 20 carbon atoms, and more preferably 1 to 6 carbon atoms, unless otherwise specified in this specification.

- "Substituted or unsubstituted aryl group"
Specific examples (specific example group G1) of the "substituted or unsubstituted aryl group" described in this specification include the following unsubstituted aryl group (specific example group G1A) and substituted aryl group (specific example group G1B). (Here, the term "unsubstituted aryl group" refers to the case where the "substituted or unsubstituted aryl group" is an "unsubstituted aryl group", and the term "substituted aryl group" refers to the case where the "substituted or unsubstituted aryl group" is a "substituted aryl group".) In this specification, the term "aryl group" simply refers to both an "unsubstituted aryl group" and a "substituted aryl group".
The term "substituted aryl group" refers to a group in which one or more hydrogen atoms of an "unsubstituted aryl group" are replaced with a substituent. Examples of the "substituted aryl group" include the "unsubstituted aryl group" in the specific example group G1A below in which one or more hydrogen atoms are replaced with a substituent, and the substituted aryl group in the specific example group G1B below. The examples of the "unsubstituted aryl group" and the examples of the "substituted aryl group" listed here are merely examples, and the "substituted aryl group" described in this specification also includes a group in which a hydrogen atom bonded to a carbon atom of the aryl group itself in the "substituted aryl group" in the specific example group G1B below is further replaced with a substituent, and a group in which a hydrogen atom of a substituent in the "substituted aryl group" in the specific example group G1B below is further replaced with a substituent.

Unsubstituted aryl groups (specific example group G1A):
Phenyl group,
p-biphenyl group,
m-biphenyl group,
o-biphenyl group,
p-terphenyl-4-yl group,
p-terphenyl-3-yl group,
p-terphenyl-2-yl group,
m-terphenyl-4-yl group,
m-terphenyl-3-yl group,
m-terphenyl-2-yl group,
o-terphenyl-4-yl group,
o-terphenyl-3-yl group,
o-terphenyl-2-yl group,
1-naphthyl group,
2-naphthyl group,
anthryl group,
Benzanthryl group,
A phenanthryl group,
Benzophenanthryl group,
A phenalenyl group,
Pyrenyl group,
Chrysenyl group,
benzochrysenyl group,
A triphenylenyl group,
Benzotriphenylenyl group,
tetracenyl group,
Pentacenyl group,
fluorenyl group,
9,9'-spirobifluorenyl group,
Benzofluorenyl group,
Dibenzofluorenyl group,
fluoranthenyl group,
Benzofluoranthenyl group,
A perylenyl group, or a monovalent aryl group derived by removing one hydrogen atom from a ring structure represented by the following general formulae (TEMP-1) to (TEMP-15).

Substituted aryl groups (specific example group G1B): o-tolyl group,
m-tolyl group,
p-tolyl group,
para-xylyl group,
meta-xylyl group,
ortho-xylyl group,
para-isopropylphenyl group,
meta-isopropylphenyl group,
ortho-isopropylphenyl group,
para-t-butylphenyl group,
A meta-t-butylphenyl group,
ortho-t-butylphenyl group,
3,4,5-trimethylphenyl group,
9,9-dimethylfluorenyl group,
9,9-diphenylfluorenyl group,
9,9-bis(4-methylphenyl)fluorenyl group,
9,9-bis(4-isopropylphenyl)fluorenyl group,
9,9-bis(4-t-butylphenyl)fluorenyl group,
Cyanophenyl group,
triphenylsilylphenyl group,
trimethylsilylphenyl group,
phenylnaphthyl group,
naphthylphenyl group, and monovalent groups derived from the ring structures represented by the above general formulae (TEMP-1) to (TEMP-15) in which one or more hydrogen atoms are replaced with substituents.

- "Substituted or unsubstituted heterocyclic group"
The "heterocyclic group" described herein is a cyclic group containing at least one heteroatom as a ring-forming atom. Specific examples of the heteroatom include a nitrogen atom, an oxygen atom, a sulfur atom, a silicon atom, a phosphorus atom, and a boron atom.
The "heterocyclic groups" described herein are either monocyclic or fused ring groups.
The "heterocyclic group" described herein may be an aromatic heterocyclic group or a non-aromatic heterocyclic group.
Specific examples (specific example group G2) of the "substituted or unsubstituted heterocyclic group" described in this specification include the following unsubstituted heterocyclic group (specific example group G2A) and substituted heterocyclic group (specific example group G2B). (Here, the unsubstituted heterocyclic group refers to the case where the "substituted or unsubstituted heterocyclic group" is an "unsubstituted heterocyclic group", and the substituted heterocyclic group refers to the case where the "substituted or unsubstituted heterocyclic group" is a "substituted heterocyclic group".) In this specification, when the term "heterocyclic group" is simply used, it includes both an "unsubstituted heterocyclic group" and a "substituted heterocyclic group".
The term "substituted heterocyclic group" refers to a group in which one or more hydrogen atoms of an "unsubstituted heterocyclic group" are replaced with a substituent. Specific examples of the "substituted heterocyclic group" include the groups in which the hydrogen atoms of the "unsubstituted heterocyclic group" in the specific example group G2A below are replaced, and the examples of the substituted heterocyclic group in the specific example group G2B below are exemplified. The examples of the "unsubstituted heterocyclic group" and the examples of the "substituted heterocyclic group" listed here are merely examples, and the "substituted heterocyclic group" described in this specification also includes the groups in the "substituted heterocyclic group" in the specific example group G2B in which a hydrogen atom bonded to a ring-forming atom of the heterocyclic group itself is further replaced with a substituent, and the groups in the "substituted heterocyclic group" in the specific example group G2B in which a hydrogen atom of a substituent is further replaced with a substituent.

Specific example group G2A includes, for example, the following unsubstituted heterocyclic groups containing a nitrogen atom (specific example group G2A1), unsubstituted heterocyclic groups containing an oxygen atom (specific example group G2A2), unsubstituted heterocyclic groups containing a sulfur atom (specific example group G2A3), and monovalent heterocyclic groups derived by removing one hydrogen atom from ring structures represented by the following general formulae (TEMP-16) to (TEMP-33) (specific example group G2A4).

Specific example group G2B includes, for example, the following substituted heterocyclic groups containing a nitrogen atom (specific example group G2B1), substituted heterocyclic groups containing an oxygen atom (specific example group G2B2), substituted heterocyclic groups containing a sulfur atom (specific example group G2B3), and groups in which one or more hydrogen atoms of a monovalent heterocyclic group derived from a ring structure represented by the following general formulae (TEMP-16) to (TEMP-33) are replaced with a substituent (specific example group G2B4).

Unsubstituted heterocyclic groups containing a nitrogen atom (specific example group G2A1):
Pyrrolyl group,
imidazolyl group,
A pyrazolyl group,
A triazolyl group,
Tetrazolyl group,
oxazolyl group,
an isoxazolyl group,
oxadiazolyl group,
A thiazolyl group,
isothiazolyl group,
A thiadiazolyl group,
Pyridyl group,
pyridazinyl group,
A pyrimidinyl group,
A pyrazinyl group,
Triazinyl group,
Indolyl groups,
isoindolyl group,
Indolizinyl group,
A quinolizinyl group,
quinolyl group,
isoquinolyl group,
Cinnolyl group,
phthalazinyl group,
A quinazolinyl group,
quinoxalinyl group,
Benzimidazolyl group,
Indazolyl group,
A phenanthrolinyl group,
A phenanthridinyl group,
acridinyl group,
A phenazinyl group,
A carbazolyl group,
Benzocarbazolyl group,
morpholino group,
phenoxazinyl group,
A phenothiazinyl group,
Azacarbazolyl and diazacarbazolyl groups.

Unsubstituted heterocyclic groups containing an oxygen atom (specific example group G2A2):
Furyl group,
oxazolyl group,
an isoxazolyl group,
oxadiazolyl group,
xanthenyl group,
benzofuranyl group,
isobenzofuranyl group,
Dibenzofuranyl group,
naphthobenzofuranyl group,
benzoxazolyl group,
benzoisoxazolyl group,
phenoxazinyl group,
morpholino group,
Dinaphthofuranyl group,
azadibenzofuranyl group,
diazadibenzofuranyl group,
Azanaphthobenzofuranyl group, and diazanaphthobenzofuranyl group.

Unsubstituted heterocyclic groups containing a sulfur atom (specific example group G2A3):
A thienyl group,
A thiazolyl group,
isothiazolyl group,
A thiadiazolyl group,
Benzothiophenyl group (benzothienyl group),
isobenzothiophenyl group (isobenzothienyl group),
Dibenzothiophenyl group (dibenzothienyl group),
Naphthobenzothiophenyl group (naphthobenzothienyl group),
benzothiazolyl group,
Benzisothiazolyl group,
A phenothiazinyl group,
Dinaphthothiophenyl group (dinaphthothienyl group),
Azadibenzothiophenyl group (azadibenzothienyl group),
Diazadibenzothiophenyl group (diazadibenzothienyl group),
Azanaphthobenzothiophenyl group (azanaphthobenzothienyl group), and diazanaphthobenzothiophenyl group (diazanaphthobenzothienyl group).

- Monovalent heterocyclic groups derived by removing one hydrogen atom from the ring structures represented by the following general formulas (TEMP-16) to (TEMP-33) (specific example group G2A4):

In the general formulae (TEMP-16) to (TEMP-33), X _A and Y _A are each independently an oxygen atom, a sulfur atom, NH, or _CH2 , provided that at least one of X _A and Y _A is an oxygen atom, a sulfur atom, or NH.
In the general formulae (TEMP-16) to (TEMP-33), when at least one of _XA and _YA is NH or _CH2 , the monovalent heterocyclic group derived from the ring structure represented by the general formulae (TEMP-16) to (TEMP-33) includes a monovalent group obtained by removing one hydrogen atom from the NH or _CH2 .

Substituted heterocyclic groups containing a nitrogen atom (specific example group G2B1):
A (9-phenyl)carbazolyl group,
(9-biphenylyl)carbazolyl group,
(9-phenyl)phenylcarbazolyl group,
(9-naphthyl)carbazolyl group,
diphenylcarbazol-9-yl group,
A phenylcarbazol-9-yl group,
methylbenzimidazolyl group,
Ethyl benzimidazolyl group,
phenyltriazinyl group,
Biphenylyltriazinyl group,
diphenyltriazinyl group,
a phenylquinazolinyl group, and a biphenylylquinazolinyl group.

Substituted heterocyclic groups containing an oxygen atom (specific example group G2B2):
phenyldibenzofuranyl group,
methyldibenzofuranyl group,
The t-butyldibenzofuranyl group, and the monovalent radical of spiro[9H-xanthene-9,9'-[9H]fluorene].

Substituted heterocyclic groups containing a sulfur atom (specific example group G2B3):
Phenyldibenzothiophenyl group,
methyldibenzothiophenyl group,
The t-butyldibenzothiophenyl group, and the monovalent radical of spiro[9H-thioxanthene-9,9'-[9H]fluorene].

- Groups in which one or more hydrogen atoms of a monovalent heterocyclic group derived from a ring structure represented by the general formulae (TEMP-16) to (TEMP-33) are replaced with a substituent (specific example group G2B4):

The above "one or more hydrogen atoms of a monovalent heterocyclic group" refers to one or more hydrogen atoms selected from a hydrogen atom bonded to a ring-forming carbon atom of the monovalent heterocyclic group, a hydrogen atom bonded to a nitrogen atom when at least one of XA and YA is NH, and a hydrogen atom of a methylene group when one of XA and YA is CH2.

- "Substituted or unsubstituted alkyl group"
Specific examples (specific example group G3) of the "substituted or unsubstituted alkyl group" described in this specification include the following unsubstituted alkyl groups (specific example group G3A) and substituted alkyl groups (specific example group G3B). (Here, the unsubstituted alkyl group refers to the case where the "substituted or unsubstituted alkyl group" is an "unsubstituted alkyl group", and the substituted alkyl group refers to the case where the "substituted or unsubstituted alkyl group" is a "substituted alkyl group".) Hereinafter, when the term "alkyl group" is simply mentioned, it includes both the "unsubstituted alkyl group" and the "substituted alkyl group".
The term "substituted alkyl group" refers to a group in which one or more hydrogen atoms in the "unsubstituted alkyl group" are replaced with a substituent. Specific examples of the "substituted alkyl group" include the following "unsubstituted alkyl group" (specific example group G3A) in which one or more hydrogen atoms are replaced with a substituent, and the examples of the substituted alkyl group (specific example group G3B). In this specification, the alkyl group in the "unsubstituted alkyl group" refers to a chain-like alkyl group. Therefore, the "unsubstituted alkyl group" includes a straight-chain "unsubstituted alkyl group" and a branched "unsubstituted alkyl group". Note that the examples of the "unsubstituted alkyl group" and the examples of the "substituted alkyl group" listed here are merely examples, and the "substituted alkyl group" described in this specification also includes a group in which a hydrogen atom of the alkyl group itself in the "substituted alkyl group" in the specific example group G3B is further replaced with a substituent, and a group in which a hydrogen atom of a substituent in the "substituted alkyl group" in the specific example group G3B is further replaced with a substituent.

Unsubstituted alkyl groups (specific example group G3A):
Methyl group,
Ethyl group,
n-propyl group,
isopropyl group,
n-butyl group,
isobutyl group,
s-Butyl group, and t-butyl group.

Substituted alkyl groups (specific example group G3B):
Heptafluoropropyl group (including isomers),
pentafluoroethyl group,
A 2,2,2-trifluoroethyl group, and a trifluoromethyl group.

- "Substituted or unsubstituted alkenyl group"
Specific examples (specific example group G4) of the "substituted or unsubstituted alkenyl group" described in this specification include the following unsubstituted alkenyl group (specific example group G4A) and substituted alkenyl group (specific example group G4B). (Here, the unsubstituted alkenyl group refers to the case where the "substituted or unsubstituted alkenyl group" is an "unsubstituted alkenyl group", and the "substituted alkenyl group" refers to the case where the "substituted or unsubstituted alkenyl group" is a "substituted alkenyl group".) In this specification, when the term "alkenyl group" is simply used, it includes both an "unsubstituted alkenyl group" and a "substituted alkenyl group".
The term "substituted alkenyl group" refers to a group in which one or more hydrogen atoms in an "unsubstituted alkenyl group" are replaced with a substituent. Specific examples of the "substituted alkenyl group" include the following "unsubstituted alkenyl group" (specific example group G4A) having a substituent, and the examples of substituted alkenyl groups (specific example group G4B). Note that the examples of the "unsubstituted alkenyl group" and the examples of the "substituted alkenyl group" listed here are merely examples, and the "substituted alkenyl group" described in this specification also includes a group in which a hydrogen atom of the alkenyl group itself in the "substituted alkenyl group" in specific example group G4B is further replaced with a substituent, and a group in which a hydrogen atom of a substituent in the "substituted alkenyl group" in specific example group G4B is further replaced with a substituent.

Unsubstituted alkenyl groups (specific example group G4A):
Vinyl group,
Allyl groups,
1-butenyl group,
A 2-butenyl group, and a 3-butenyl group.

Substituted alkenyl groups (specific example group G4B):
1,3-butadienyl group,
1-methylvinyl group,
1-methylallyl group,
1,1-dimethylallyl group,
2-methylallyl group, and 1,2-dimethylallyl group.

- "Substituted or unsubstituted alkynyl group"
Specific examples (specific example group G5) of the "substituted or unsubstituted alkynyl group" described in this specification include the following unsubstituted alkynyl groups (specific example group G5A). (Here, the unsubstituted alkynyl group refers to the case where the "substituted or unsubstituted alkynyl group" is an "unsubstituted alkynyl group.") Hereinafter, when the term "alkynyl group" is simply used, it includes both an "unsubstituted alkynyl group" and a "substituted alkynyl group."
The term "substituted alkynyl group" refers to an "unsubstituted alkynyl group" in which one or more hydrogen atoms have been replaced with a substituent. Specific examples of the "substituted alkynyl group" include the following "unsubstituted alkynyl group" (specific example group G5A) in which one or more hydrogen atoms have been replaced with a substituent.

Unsubstituted alkynyl groups (specific example group G5A):
Ethynyl group

- "Substituted or unsubstituted cycloalkyl groups"
Specific examples (specific example group G6) of the "substituted or unsubstituted cycloalkyl group" described in this specification include the following unsubstituted cycloalkyl group (specific example group G6A) and substituted cycloalkyl group (specific example group G6B). (Here, the term "unsubstituted cycloalkyl group" refers to the case where the "substituted or unsubstituted cycloalkyl group" is an "unsubstituted cycloalkyl group", and the term "substituted cycloalkyl group" refers to the case where the "substituted or unsubstituted cycloalkyl group" is a "substituted cycloalkyl group".) In this specification, when the term "cycloalkyl group" is simply used, it includes both an "unsubstituted cycloalkyl group" and a "substituted cycloalkyl group".
The term "substituted cycloalkyl group" refers to a group in which one or more hydrogen atoms in the "unsubstituted cycloalkyl group" are replaced with a substituent. Specific examples of the "substituted cycloalkyl group" include the following "unsubstituted cycloalkyl group" (specific example group G6A) in which one or more hydrogen atoms are replaced with a substituent, and the examples of the substituted cycloalkyl group (specific example group G6B). The examples of the "unsubstituted cycloalkyl group" and the examples of the "substituted cycloalkyl group" listed here are merely examples, and the "substituted cycloalkyl group" described in this specification also includes a group in which one or more hydrogen atoms bonded to a carbon atom of the cycloalkyl group itself in the "substituted cycloalkyl group" in the specific example group G6B are replaced with a substituent, and a group in which a hydrogen atom of a substituent in the "substituted cycloalkyl group" in the specific example group G6B is further replaced with a substituent.

Unsubstituted cycloalkyl groups (specific example group G6A):
A cyclopropyl group,
A cyclobutyl group,
Cyclopentyl group,
cyclohexyl group,
1-adamantyl group,
2-adamantyl group,
1-norbornyl group, and 2-norbornyl group.

Substituted cycloalkyl groups (specific example group G6B):
4-Methylcyclohexyl group.

- "A group represented by -Si( _R901 )( _R902 )( _R903 )"
Specific examples (specific example group G7) of the group represented by --Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ) described in this specification include:
-Si(G1)(G1)(G1),
-Si(G1)(G2)(G2),
-Si(G1)(G1)(G2),
-Si(G2)(G2)(G2),
-Si(G3)(G3)(G3), and -Si(G6)(G6)(G6)
Here,
G1 is a "substituted or unsubstituted aryl group" described in specific example group G1.
G2 is a "substituted or unsubstituted heterocyclic group" described in specific example group G2.
G3 is a "substituted or unsubstituted alkyl group" described in specific example group G3.
G6 is a "substituted or unsubstituted cycloalkyl group" described in specific example group G6.
The multiple G1s in -Si(G1)(G1)(G1) are the same as or different from each other.
The multiple G2s in —Si(G1)(G2)(G2) are the same as or different from each other.
The multiple G1s in -Si(G1)(G1)(G2) are the same as or different from each other.
The multiple G2s in —Si(G2)(G2)(G2) are the same as or different from each other.
The multiple G3s in —Si(G3)(G3)(G3) are the same as or different from each other.
The multiple G6s in —Si(G6)(G6)(G6) are the same as or different from each other.

- "A group represented by -O-(R ₉₀₄ )"
Specific examples (specific example group G8) of the group represented by -O-(R ₉₀₄ ) described in this specification include:
-O(G1),
-O (G2),
-O(G3) and -O(G6)
Examples include:
here,
G1 is a "substituted or unsubstituted aryl group" described in specific example group G1.
G2 is a "substituted or unsubstituted heterocyclic group" described in specific example group G2.
G3 is a "substituted or unsubstituted alkyl group" described in specific example group G3.
G6 is a "substituted or unsubstituted cycloalkyl group" described in specific example group G6.

- "A group represented by -S-(R ₉₀₅ )"
Specific examples (specific example group G9) of the group represented by -S-(R ₉₀₅ ) described in this specification include:
-S (G1),
-S (G2),
-S(G3) and -S(G6)
Examples include:
here,
G1 is a "substituted or unsubstituted aryl group" described in specific example group G1.
G2 is a "substituted or unsubstituted heterocyclic group" described in specific example group G2.
G3 is a "substituted or unsubstituted alkyl group" described in specific example group G3.
G6 is a "substituted or unsubstituted cycloalkyl group" described in specific example group G6.

- "A group represented by -N(R ₉₀₆ )(R ₉₀₇ )"
Specific examples (specific example group G10) of the group represented by -N(R ₉₀₆ )(R ₉₀₇ ) described in this specification include:
-N(G1)(G1),
-N(G2)(G2),
-N(G1)(G2),
-N(G3)(G3), and -N(G6)(G6).
here,
G1 is a "substituted or unsubstituted aryl group" described in specific example group G1.
G2 is a "substituted or unsubstituted heterocyclic group" described in specific example group G2.
G3 is a "substituted or unsubstituted alkyl group" described in specific example group G3.
G6 is a "substituted or unsubstituted cycloalkyl group" described in specific example group G6.
The multiple G1s in -N(G1)(G1) are the same or different from each other.
The multiple G2s in -N(G2)(G2) are the same or different from each other.
The multiple G3s in -N(G3)(G3) are the same or different.
The multiple G6s in -N(G6)(G6) are the same or different.

・"Halogen atoms"
Specific examples of the "halogen atom" described in this specification (specific example group G11) include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.

- "Substituted or unsubstituted fluoroalkyl groups"
The term "substituted or unsubstituted fluoroalkyl group" as used herein means a group in which at least one hydrogen atom bonded to a carbon atom constituting the alkyl group in the "substituted or unsubstituted alkyl group" is replaced with a fluorine atom, and also includes a group (perfluoro group) in which all hydrogen atoms bonded to carbon atoms constituting the alkyl group in the "substituted or unsubstituted alkyl group" are replaced with fluorine atoms. The number of carbon atoms in the "unsubstituted fluoroalkyl group" is 1 to 50, preferably 1 to 30, and more preferably 1 to 18, unless otherwise specified in the present specification. The term "substituted fluoroalkyl group" means a group in which one or more hydrogen atoms in the "fluoroalkyl group" are replaced with a substituent. The term "substituted fluoroalkyl group" as used herein also includes a group in which one or more hydrogen atoms bonded to a carbon atom of the alkyl chain in the "substituted fluoroalkyl group" are further replaced with a substituent, and a group in which one or more hydrogen atoms of the substituent in the "substituted fluoroalkyl group" are further replaced with a substituent. Specific examples of the "unsubstituted fluoroalkyl group" include the examples of groups in which one or more hydrogen atoms in the "alkyl group" (specific example group G3) are replaced with fluorine atoms.

- "Substituted or unsubstituted haloalkyl group"
The term "substituted or unsubstituted haloalkyl group" as used herein means a group in which at least one hydrogen atom bonded to a carbon atom constituting the alkyl group in the "substituted or unsubstituted alkyl group" is replaced with a halogen atom, and also includes a group in which all hydrogen atoms bonded to carbon atoms constituting the alkyl group in the "substituted or unsubstituted alkyl group" are replaced with halogen atoms. The number of carbon atoms in the "unsubstituted haloalkyl group" is 1 to 50, preferably 1 to 30, and more preferably 1 to 18, unless otherwise specified in the present specification. The term "substituted haloalkyl group" means a group in which one or more hydrogen atoms in the "haloalkyl group" are replaced with a substituent. The term "substituted haloalkyl group" as used herein also includes a group in which one or more hydrogen atoms bonded to a carbon atom in the alkyl chain in the "substituted haloalkyl group" are further replaced with a substituent, and a group in which one or more hydrogen atoms of the substituent in the "substituted haloalkyl group" are further replaced with a substituent. Specific examples of the "unsubstituted haloalkyl group" include the examples of the group in which one or more hydrogen atoms in the "alkyl group" (specific example group G3) are replaced with a halogen atom. Haloalkyl groups are sometimes referred to as halogenated alkyl groups.

- "Substituted or unsubstituted alkoxy group"
A specific example of the "substituted or unsubstituted alkoxy group" described in this specification is a group represented by -O(G3), where G3 is a "substituted or unsubstituted alkyl group" described in specific example group G3. The number of carbon atoms in the "unsubstituted alkoxy group" is 1 to 50, preferably 1 to 30, and more preferably 1 to 18, unless otherwise specified in this specification.

- "Substituted or unsubstituted alkylthio group"
A specific example of the "substituted or unsubstituted alkylthio group" described in this specification is a group represented by -S(G3), where G3 is a "substituted or unsubstituted alkyl group" described in specific example group G3. The number of carbon atoms in the "unsubstituted alkylthio group" is 1 to 50, preferably 1 to 30, and more preferably 1 to 18, unless otherwise specified in this specification.

- "Substituted or unsubstituted aryloxy group"
A specific example of the "substituted or unsubstituted aryloxy group" described in this specification is a group represented by -O(G1), where G1 is a "substituted or unsubstituted aryl group" described in specific example group G1. The number of ring carbon atoms of the "unsubstituted aryloxy group" is 6 to 50, preferably 6 to 30, and more preferably 6 to 18, unless otherwise specified in this specification.

- "Substituted or unsubstituted arylthio group"
A specific example of the "substituted or unsubstituted arylthio group" described in this specification is a group represented by -S(G1), where G1 is a "substituted or unsubstituted aryl group" described in specific example group G1. The number of ring carbon atoms of the "unsubstituted arylthio group" is 6 to 50, preferably 6 to 30, and more preferably 6 to 18, unless otherwise specified in this specification.

- "Substituted or unsubstituted trialkylsilyl group"
A specific example of the "trialkylsilyl group" described in this specification is a group represented by -Si(G3)(G3)(G3), where G3 is a "substituted or unsubstituted alkyl group" described in specific example group G3. The multiple G3s in -Si(G3)(G3)(G3) are the same as or different from each other. The number of carbon atoms in each alkyl group of the "trialkylsilyl group" is 1 to 50, preferably 1 to 20, and more preferably 1 to 6, unless otherwise specified in this specification.

- "Substituted or unsubstituted aralkyl group"
A specific example of the "substituted or unsubstituted aralkyl group" described in this specification is a group represented by -(G3)-(G1), where G3 is a "substituted or unsubstituted alkyl group" described in the specific example group G3, and G1 is a "substituted or unsubstituted aryl group" described in the specific example group G1. Thus, an "aralkyl group" is a group in which a hydrogen atom of an "alkyl group" is replaced with an "aryl group" as a substituent, and is one aspect of a "substituted alkyl group". An "unsubstituted aralkyl group" is an "unsubstituted alkyl group" substituted with an "unsubstituted aryl group", and the number of carbon atoms of the "unsubstituted aralkyl group" is 7 to 50, preferably 7 to 30, and more preferably 7 to 18, unless otherwise specified in this specification.
Specific examples of the "substituted or unsubstituted aralkyl group" include benzyl group, 1-phenylethyl group, 2-phenylethyl group, 1-phenylisopropyl group, 2-phenylisopropyl group, phenyl-t-butyl group, α-naphthylmethyl group, 1-α-naphthylethyl group, 2-α-naphthylethyl group, 1-α-naphthylisopropyl group, 2-α-naphthylisopropyl group, β-naphthylmethyl group, 1-β-naphthylethyl group, 2-β-naphthylethyl group, 1-β-naphthylisopropyl group, and 2-β-naphthylisopropyl group.

Unless otherwise specified herein, the substituted or unsubstituted aryl group described herein is preferably a phenyl group, a p-biphenyl group, a m-biphenyl group, an o-biphenyl group, a p-terphenyl-4-yl group, a p-terphenyl-3-yl group, a p-terphenyl-2-yl group, a m-terphenyl-4-yl group, a m-terphenyl-3-yl group, a m-terphenyl-2-yl group, a o-terphenyl-4-yl group, a o-terphenyl-3-yl group, a o-terphenyl-2-yl group, a 1-naphthyl group, a 2-naphthyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a chrysenyl group, a triphenylenyl group, a fluorenyl group, a 9,9'-spirobifluorenyl group, a 9,9-dimethylfluorenyl group, and a 9,9-diphenylfluorenyl group.

The substituted or unsubstituted heterocyclic groups described in this specification are preferably a pyridyl group, a pyrimidinyl group, a triazinyl group, a quinolyl group, an isoquinolyl group, a quinazolinyl group, a benzimidazolyl group, a phenanthrolinyl group, a carbazolyl group (a 1-carbazolyl group, a 2-carbazolyl group, a 3-carbazolyl group, a 4-carbazolyl group, or a 9-carbazolyl group), a benzocarbazolyl group, an azacarbazolyl group, a diazacarbazolyl group, a dibenzofuranyl group, a naphthobenzofuranyl group, an azadibenzofuranyl group, a diazadibenzofuranyl group, a dibenzothiophenyl group, a naphthobenzothiophenyl group, an aza These include dibenzothiophenyl group, diazadibenzothiophenyl group, (9-phenyl)carbazolyl group ((9-phenyl)carbazol-1-yl group, (9-phenyl)carbazol-2-yl group, (9-phenyl)carbazol-3-yl group, or (9-phenyl)carbazol-4-yl group), (9-biphenylyl)carbazolyl group, (9-phenyl)phenylcarbazolyl group, diphenylcarbazol-9-yl group, phenylcarbazol-9-yl group, phenyltriazinyl group, biphenylyltriazinyl group, diphenyltriazinyl group, phenyldibenzofuranyl group, and phenyldibenzothiophenyl group.

In this specification, unless otherwise specified, the carbazolyl group is specifically any of the following groups:

In this specification, the (9-phenyl)carbazolyl group is specifically any of the following groups, unless otherwise specified in this specification.

In the general formulas (TEMP-Cz1) to (TEMP-Cz9), * indicates the bond position.

In this specification, the dibenzofuranyl group and the dibenzothiophenyl group are specifically any of the following groups, unless otherwise specified in this specification.

In the general formulas (TEMP-34) to (TEMP-41), * indicates the bond position.

The substituted or unsubstituted alkyl groups described in this specification are preferably methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, t-butyl, and the like, unless otherwise specified in this specification.

- "Substituted or unsubstituted arylene group"
Unless otherwise specified, the "substituted or unsubstituted arylene group" described in this specification is a divalent group derived by removing one hydrogen atom on the aryl ring from the above-mentioned "substituted or unsubstituted aryl group". Specific examples of the "substituted or unsubstituted arylene group" (specific example group G12) include divalent groups derived by removing one hydrogen atom on the aryl ring from the "substituted or unsubstituted aryl group" described in specific example group G1.

- "Substituted or unsubstituted divalent heterocyclic group"
The "substituted or unsubstituted divalent heterocyclic group" described in this specification is, unless otherwise specified, a divalent group derived by removing one hydrogen atom on the heterocycle from the above-mentioned "substituted or unsubstituted heterocyclic group". Specific examples of the "substituted or unsubstituted divalent heterocyclic group" (specific example group G13) include divalent groups derived by removing one hydrogen atom on the heterocycle from the "substituted or unsubstituted heterocyclic group" described in specific example group G2.

- "Substituted or unsubstituted alkylene group"
Unless otherwise specified, the "substituted or unsubstituted alkylene group" described in this specification is a divalent group derived by removing one hydrogen atom on the alkyl chain from the above-mentioned "substituted or unsubstituted alkyl group". Specific examples of the "substituted or unsubstituted alkylene group" (specific example group G14) include divalent groups derived by removing one hydrogen atom on the alkyl chain from the "substituted or unsubstituted alkyl group" described in specific example group G3.

The substituted or unsubstituted arylene group described in this specification is preferably any one of the groups represented by the following general formulas (TEMP-42) to (TEMP-68), unless otherwise specified in this specification.

In the above general formulas (TEMP-42) to (TEMP-52), Q ₁ to Q ₁₀ each independently represent a hydrogen atom or a substituent.
In the above general formulae (TEMP-42) to (TEMP-52), * represents a bonding position.

In the above general formulas (TEMP-53) to (TEMP-62), Q ₁ to Q ₁₀ each independently represent a hydrogen atom or a substituent.
Q ₉ and Q ₁₀ may be bonded to each other via a single bond to form a ring.
In the above general formulae (TEMP-53) to (TEMP-62), * represents a bonding position.

In the above general formulas (TEMP-63) to (TEMP-68), Q ₁ to Q ₈ each independently represent a hydrogen atom or a substituent.
In the above general formulae (TEMP-63) to (TEMP-68), * represents a bonding position.

The substituted or unsubstituted divalent heterocyclic group described in this specification is preferably any one of the groups represented by the following general formulas (TEMP-69) to (TEMP-102), unless otherwise specified in this specification.

In the above general formulas (TEMP-69) to (TEMP-82), Q ₁ to Q ₉ each independently represent a hydrogen atom or a substituent.

In the above general formulas (TEMP-83) to (TEMP-102), Q ₁ to Q ₈ each independently represent a hydrogen atom or a substituent.

The above is an explanation of "the substituents described in this specification."

・"When bonded to form a ring"
In this specification, the phrase "one or more of a set consisting of two or more adjacent groups bond to each other to form a substituted or unsubstituted monocycle, bond to each other to form a substituted or unsubstituted fused ring, or are not bonded to each other" means the case where "one or more of a set consisting of two or more adjacent groups bond to each other to form a substituted or unsubstituted monocycle", the case where "one or more of a set consisting of two or more adjacent groups bond to each other to form a substituted or unsubstituted fused ring", and the case where "one or more of a set consisting of two or more adjacent groups are not bonded to each other".
In this specification, the cases where "one or more of a set of two or more adjacent rings are bonded to each other to form a substituted or unsubstituted monocyclic ring" and "one or more of a set of two or more adjacent rings are bonded to each other to form a substituted or unsubstituted fused ring" (hereinafter, these cases may be collectively referred to as "a case where they are bonded to form a ring") will be explained below. The case of an anthracene compound represented by the following general formula (TEMP-103), in which the mother skeleton is an anthracene ring, will be explained as an example.

For example, in the case where "one or more pairs of adjacent two or more of R ₉₂₁ to R ₉₃₀ are bonded to each other to form a ring", the pair of adjacent two that constitutes one group includes the pair of R ₉₂₁ and R ₉₂₂ , the pair of R ₉₂₂ and R ₉₂₃ , the pair of R ₉₂₃ and R ₉₂₄ , the pair of R ₉₂₄ and R ₉₃₀ , the pair of R ₉₃₀ and R ₉₂₅ , the pair of R ₉₂₅ and R ₉₂₆ , the pair of R ₉₂₆ and R ₉₂₇ , the pair of R ₉₂₇ and R ₉₂₈ , the pair of R ₉₂₈ and R ₉₂₉ , and the pair of R ₉₂₉ and R ₉₂₁ .

The above "one or more pairs" means that two or more pairs of the adjacent two or more pairs may simultaneously form a ring. For example, when R ₉₂₁ and R ₉₂₂ are bonded to each other to form a ring Q _A , and R ₉₂₅ and R ₉₂₆ are bonded to each other to form a ring Q _B , the anthracene compound represented by the general formula (TEMP-103) is represented by the following general formula (TEMP-104).

The case where "a set of two or more adjacent rings" forms a ring includes not only the case where a set of "two" adjacent rings is bonded as in the above example, but also the case where a set of "three or more adjacent rings is bonded. For example, it means the case where R ₉₂₁ and R ₉₂₂ are bonded to each other to form a ring Q _A , and R ₉₂₂ and R ₉₂₃ are bonded to each other to form a ring Q _C , and a set of three adjacent rings (R ₉₂₁ , R ₉₂₂ and R ₉₂₃ ) are bonded to each other to form a ring and are condensed to the anthracene skeleton. In this case, the anthracene compound represented by the general formula (TEMP-103) is represented by the following general formula (TEMP-105). In the following general formula (TEMP-105), ring Q _A and ring Q _C share R ₉₂₂ .

The "monocyclic ring" or "fused ring" formed may be a saturated ring or an unsaturated ring as the structure of only the ring formed. Even if "one of the pairs of adjacent two" forms a "monocyclic ring" or a "fused ring", the "monocyclic ring" or the "fused ring" can form a saturated ring or an unsaturated ring. For example, the ring Q _A and the ring Q B formed in the general formula (TEMP-104) are "monocyclic rings" or "fused rings", respectively. Furthermore, the ring Q _A and the ring Q _C formed in the general formula (TEMP-105) are "fused rings". The ring Q _A and the ring Q _C in the general formula (TEMP-105) are fused rings by the fusion of the ring Q _A and the ring Q _C. If the ring Q _A in the general formula (TMEP-104) is a benzene ring, the ring Q _{A is} a monocyclic ring. When ring Q 1 _A in the above general formula (TMEP-104) is a naphthalene ring, ring Q _{1 A} is a fused ring.

The term "unsaturated ring" refers to an aromatic hydrocarbon ring or an aromatic heterocyclic ring. The term "saturated ring" refers to an aliphatic hydrocarbon ring or a non-aromatic heterocyclic ring.
Specific examples of the aromatic hydrocarbon ring include structures in which the groups given as specific examples in the specific example group G1 are terminated with a hydrogen atom.
Specific examples of the aromatic heterocycle include structures in which the aromatic heterocyclic groups exemplified as specific examples in the specific example group G2 are terminated with a hydrogen atom.
Specific examples of the aliphatic hydrocarbon ring include structures in which the groups given as specific examples in the specific example group G6 are terminated with a hydrogen atom.
"Forming a ring" means forming a ring only with a plurality of atoms of the mother skeleton, or with a plurality of atoms of the mother skeleton and one or more arbitrary elements. For example, the ring _QA formed by bonding R ₉₂₁ and R ₉₂₂ to each other in the general formula (TEMP-104) means a ring formed by the carbon atom of the anthracene skeleton to which R ₉₂₁ is bonded, the carbon atom of the anthracene skeleton to which R ₉₂₂ is bonded, and one or more arbitrary elements. As a specific example, when R ₉₂₁ and R ₉₂₂ form a ring _QA , when the carbon atom of the anthracene skeleton to which R ₉₂₁ is bonded, the carbon atom of the anthracene skeleton to which R ₉₂₂ is bonded, and four carbon atoms form a monocyclic unsaturated ring, the ring formed by R ₉₂₁ and R ₉₂₂ is a benzene ring.

Here, unless otherwise specified in the present specification, the "arbitrary element" is preferably at least one element selected from the group consisting of carbon, nitrogen, oxygen, and sulfur. In the arbitrary element (for example, in the case of a carbon element or a nitrogen element), a bond that does not form a ring may be terminated with a hydrogen atom or the like, or may be substituted with an "arbitrary substituent" described below. When an arbitrary element other than a carbon element is included, the ring formed is a heterocycle.
Unless otherwise specified in this specification, the "one or more arbitrary elements" constituting the single ring or the condensed ring is preferably 2 or more and 15 or less, more preferably 3 or more and 12 or less, and even more preferably 3 or more and 5 or less.
Unless otherwise specified in this specification, of the "monocyclic ring" and the "condensed ring", the "monocyclic ring" is preferred.
Unless otherwise specified in this specification, of the "saturated ring" and the "unsaturated ring", the "unsaturated ring" is preferred.
Unless otherwise specified in this specification, a "monocyclic ring" is preferably a benzene ring.
Unless otherwise specified in this specification, the "unsaturated ring" is preferably a benzene ring.
When "one or more of a set consisting of two or more adjacent rings""combine with each other to form a substituted or unsubstituted monocyclic ring" or "combine with each other to form a substituted or unsubstituted fused ring", unless otherwise specified in this specification, preferably, one or more of a set consisting of two or more adjacent rings combine with each other to form a substituted or unsubstituted "unsaturated ring" consisting of a plurality of atoms of the parent skeleton and at least one element selected from the group consisting of 1 to 15 carbon elements, nitrogen elements, oxygen elements, and sulfur elements.

When the above-mentioned "monocyclic ring" or "condensed ring" has a substituent, the substituent is, for example, the "optional substituent" described later. When the above-mentioned "monocyclic ring" or "condensed ring" has a substituent, specific examples of the substituent are the substituents described in the above-mentioned section "Substituents described in this specification".
When the above-mentioned "saturated ring" or "unsaturated ring" has a substituent, the substituent is, for example, the "optional substituent" described later. When the above-mentioned "monocyclic ring" or "condensed ring" has a substituent, specific examples of the substituent are the substituents described in the above section "Substituents described in this specification".
The above is an explanation of the case where "one or more pairs of adjacent groups bond with each other to form a substituted or unsubstituted monocyclic ring" and the case where "one or more pairs of adjacent groups bond with each other to form a substituted or unsubstituted fused ring"("combined to form a ring").

Substituents in the case of "substituted or unsubstituted" In one embodiment of the present specification, the substituents in the case of "substituted or unsubstituted" (sometimes referred to as "optional substituents" in the present specification) are, for example,
an unsubstituted alkyl group having 1 to 50 carbon atoms;
an unsubstituted alkenyl group having 2 to 50 carbon atoms,
an unsubstituted alkynyl group having 2 to 50 carbon atoms,
an unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
-Si( _R901 )( _R902 )( _R903 ),
-O-(R ₉₀₄ ),
-S-(R ₉₀₅ ),
-N(R ₉₀₆ )(R ₉₀₇ ),
Halogen atoms, cyano groups, nitro groups,
a group selected from the group consisting of an unsubstituted aryl group having 6 to 50 ring carbon atoms and an unsubstituted heterocyclic group having 5 to 50 ring atoms,
In the formula, R ₉₀₁ to R ₉₀₇ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
It is a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.
When two or more R ₉₀₁ are present, the two or more R ₉₀₁ are the same or different from each other,
When two or more R ₉₀₂ are present, the two or more R ₉₀₂ are the same or different from each other,
When two or more R ₉₀₃ are present, the two or more R ₉₀₃ are the same or different from each other,
When two or more R ₉₀₄ are present, the two or more R ₉₀₄ are the same or different from each other,
When two or more R ₉₀₅ are present, the two or more R ₉₀₅ are the same or different from each other,
When two or more R ₉₀₆ are present, the two or more R ₉₀₆ are the same or different from each other,
When two or more R ₉₀₇ are present, the two or more R ₉₀₇ are the same or different.

In one embodiment, the substituent in the above "substituted or unsubstituted" is:
an alkyl group having 1 to 50 carbon atoms,
The group is selected from the group consisting of an aryl group having 6 to 50 ring carbon atoms and a heterocyclic group having 5 to 50 ring atoms.

In one embodiment, the substituent in the above "substituted or unsubstituted" is:
an alkyl group having 1 to 18 carbon atoms,
The group is selected from the group consisting of an aryl group having 6 to 18 ring carbon atoms and a heterocyclic group having 5 to 18 ring atoms.

Specific examples of each of the above optional substituents are the specific examples of the substituents described in the above section "Substituents described in this specification."

Unless otherwise specified in this specification, any adjacent substituents may be combined with each other to form a "saturated ring" or an "unsaturated ring", preferably a substituted or unsubstituted saturated 5-membered ring, a substituted or unsubstituted saturated 6-membered ring, a substituted or unsubstituted unsaturated 5-membered ring, or a substituted or unsubstituted unsaturated 6-membered ring, more preferably a benzene ring.
Unless otherwise specified in the present specification, the optional substituent may further have a substituent. The substituent that the optional substituent further has is the same as the optional substituent described above.

In this specification, a numerical range expressed using "AA-BB" means a range that includes the number AA written before "AA-BB" as the lower limit and the number BB written after "AA-BB" as the upper limit.

First Embodiment
(Organic electroluminescence element)
The organic electroluminescence device according to the present embodiment includes an anode, a cathode, a first light-emitting layer disposed between the anode and the cathode, and a second light-emitting layer disposed between the first light-emitting layer and the cathode, the first light-emitting layer and the second light-emitting layer being disposed between the anode and the cathode in this order, the first light-emitting layer includes a first host material, the second light-emitting layer includes a second host material, the first host material and the second host material are different from each other, the first light-emitting layer includes at least a first light-emitting compound, the second light-emitting layer includes at least a second light-emitting compound, the first light-emitting compound and the second light-emitting compound are the same or different from each other, a triplet energy T 1 (H1) of the first host material and a triplet energy T 1 (H2) of the second host material are different from each other, and the triplet energy T ₁ (H3) of the first host material and the triplet energy T ₁ (H4) of the second host material are different from each other. The energy level of the lowest unoccupied molecular orbital (LUMO) (H2) of the second host material and the energy level of the lowest unoccupied molecular orbital (LUMO) (D2) of the second light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 2):
T ₁ (H1) < T ₁ (H2) ... (Equation 1)
|LUMO(D2)|-|LUMO(H2)|<0.74 eV ... (Equation 2)

In the organic EL element of the present embodiment, it is preferable that the energy level of the lowest unoccupied molecular orbital (LUMO (H2)) of the second host material and the energy level of the lowest unoccupied molecular orbital (LUMO (D2)) of the second light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 2D).
0 eV<|LUMO(D2)|-|LUMO(H2)| ... (Math 2D)

Conventionally, triplet-triplet-annhilation (sometimes referred to as TTA) has been known as a technique for improving the luminous efficiency of organic electroluminescence elements. TTA is a mechanism in which triplet excitons collide with each other to generate singlet excitons. The TTA mechanism is also sometimes referred to as the TTF mechanism, as described in Patent Document 2.

The TTF phenomenon will be explained. Holes injected from the anode and electrons injected from the cathode recombine in the light-emitting layer to generate excitons. As is conventionally known, the spin state is such that singlet excitons account for 25% and triplet excitons account for 75%. In conventionally known fluorescent elements, 25% of the singlet excitons emit light when they relax to the ground state, but the remaining 75% of the triplet excitons return to the ground state through a thermal deactivation process without emitting light. Therefore, the theoretical limit of the internal quantum efficiency of conventional fluorescent elements was said to be 25%.
On the other hand, the behavior of triplet excitons generated inside organic materials has been theoretically investigated. According to S. M. Bachilo et al. (J. Phys. Chem. A, 104, 7711 (2000)), assuming that higher-order excitons such as quintets immediately return to triplet states, when the density of triplet excitons (hereinafter referred to as ³ A ^* ) increases, triplet excitons collide with each other and a reaction as shown in the following formula occurs. Here, ¹ A represents the ground state, and ¹ A ^* represents the lowest excited singlet exciton.
³ A ^* + ³ A ^* → (4/9) ¹ A + (1/9) ¹ A ^* + (13/9) ³ A ^*
That is, 5 ³ A ^* → 4 ¹ A + 1A ^* , and it is predicted that 1/5, i.e., 20%, of the 75% triplet excitons initially generated will change to singlet excitons. Therefore, the singlet excitons contributing as light will be 40%, which is 75% x (1/5) = 15% added to the 25% initially generated. At this time, the emission ratio (TTF ratio) derived from TTF in the total emission intensity will be 15/40, i.e., 37.5%. In addition, if it is assumed that the 75% triplet excitons initially generated collide with each other to generate singlet excitons (one singlet exciton is generated from two triplet excitons), a very high internal quantum efficiency of 62.5% will be obtained by adding 75% x (1/2) = 37.5% to the 25% initially generated singlet excitons. At this time, the TTF ratio is 37.5/62.5 = 60%.

According to the organic electroluminescence element of this embodiment, triplet excitons generated by recombination of holes and electrons in the second light-emitting layer are unlikely to be quenched at the interface between the second light-emitting layer and the organic layer even if there are excess carriers at the interface between the second light-emitting layer and the organic layer that is in direct contact with the second light-emitting layer. For example, when the recombination region is locally present at the interface between the second light-emitting layer and the hole transport layer or the electron blocking layer, quenching due to excess electrons is considered. On the other hand, when the recombination region is locally present at the interface between the second light-emitting layer and the electron transport layer or the hole blocking layer, quenching due to excess holes is considered.
The organic electroluminescent device according to this embodiment has at least two light-emitting layers (i.e., a first light-emitting layer and a second light-emitting layer) that satisfy a specific relationship, and the triplet energy T ₁ (H1) of the first host material in the first light-emitting layer and the triplet energy T ₁ (H2) of the second host material in the second light-emitting layer satisfy the relationship of the above mathematical formula (Mathematical Formula 1).
By providing the first light-emitting layer and the second light-emitting layer so as to satisfy the relationship of the above formula (Mathematical formula 1), triplet excitons generated in the second light-emitting layer can be transferred to the first light-emitting layer without being quenched by excess carriers, and reverse transfer from the first light-emitting layer to the second light-emitting layer can be suppressed. As a result, the TTF mechanism is expressed in the first light-emitting layer, singlet excitons are efficiently generated, and the luminous efficiency is improved.
In this way, the organic electroluminescence element has a second light-emitting layer that mainly generates triplet excitons, and a first light-emitting layer that mainly exerts the TTF mechanism by utilizing triplet excitons transferred from the second light-emitting layer, as different regions, and uses a compound having a smaller triplet energy than the second host material in the second light-emitting layer as the first host material in the first light-emitting layer, thereby providing a difference in triplet energy, thereby improving the luminous efficiency.

In the organic EL element according to this embodiment, it is preferable that the triplet energy T ₁ (H1) of the first host material and the triplet energy T ₁ (H2) of the second host material satisfy the relationship of the following mathematical formula (Mathematical Formula 9).
T ₁ (H2) - T ₁ (H1) > 0.03 eV (Equation 9)

In this specification, a "host material" is a material that is contained in, for example, "50% by weight or more of a layer." Thus, for example, the first light-emitting layer contains a first host material in an amount of 50% by weight or more of the total weight of the first light-emitting layer. The second light-emitting layer contains, for example, a second host material in an amount of 50% by weight or more of the total weight of the second light-emitting layer.

If the difference between the absolute value |LUMO(D2)| of the energy level LUMO(D2) of the lowest unoccupied molecular orbital of the second light-emitting compound in the second emitting layer and the absolute value |LUMO(H2)| of the energy level LUMO(H2) of the lowest unoccupied molecular orbital of the second host material is too large, electrons may accumulate too much at the interface with an organic layer (e.g., a hole blocking layer or an electron transport layer) that is in contact with the cathode side of the second emitting layer, resulting in a shortened life of the organic EL element.
In the organic EL element according to this embodiment, the energy level LUMO(H2) of the lowest unoccupied molecular orbital of the second host material and the energy level LUMO(D2) of the lowest unoccupied molecular orbital of the second light-emitting compound satisfy the relationship of the above-mentioned formula (Mathematical Formula 2). As shown in the formula (Mathematical Formula 2), the difference between |LUMO(D2)| and |LUMO(H2)| is less than 0.74 eV, so that excessive accumulation of electrons at the cathode side interface of the second light-emitting layer is suppressed, and the life of the organic EL element is extended.

In the organic EL element according to this embodiment, it is preferable that the energy level LUMO (H2) of the lowest unoccupied molecular orbital of the second host material and the energy level LUMO (D2) of the lowest unoccupied molecular orbital of the second light-emitting compound satisfy the relationship represented by the mathematical formula (2A), it is more preferable that they satisfy the relationship represented by the mathematical formula (2B), and it is even more preferable that they satisfy the relationship represented by the mathematical formula (2C).
|LUMO(D2)|-|LUMO(H2)|≦0.70 eV ... (Equation 2A)
|LUMO(D2)|-|LUMO(H2)|≦0.60 eV ... (Equation 2B)
|LUMO(D2)|-|LUMO(H2)|≦0.50 eV ... (Equation 2C)

(HOMO Measurement Method)
In this specification, the energy level of the highest occupied molecular orbital (HOMO) is measured using a photoelectron spectrometer under atmospheric conditions. Specifically, the energy level of the highest occupied molecular orbital (HOMO) can be measured by the method described in the Examples.

(LUMO Measurement Method)
In this specification, the energy level LUMO of the lowest unoccupied molecular orbital is a value calculated by the following formula (Mathematical formula 1X) based on the measured values of the energy level HOMO of the highest occupied molecular orbital and the singlet energy _S1 . The unit of the energy level LUMO of the lowest unoccupied molecular orbital, the energy level HOMO of the highest occupied molecular orbital, and the singlet energy _S1 is eV.
LUMO = HOMO + _S1 ... (Equation 1X)

(Emission Wavelength of Organic EL Element)
The organic electroluminescence element according to this embodiment preferably emits light having a maximum peak wavelength of 500 nm or less when the element is driven.
The organic electroluminescence element according to this embodiment more preferably emits light having a maximum peak wavelength of 430 nm or more and 480 nm or less when the element is driven.
The maximum peak wavelength of light emitted by an organic EL element when the element is driven is measured as follows. A voltage is applied to the organic EL element so that the current density is 10 mA/ ^cm2 , and the spectral radiance spectrum is measured using a spectroradiometer CS-2000 (manufactured by Konica Minolta, Inc.). In the obtained spectral radiance spectrum, the peak wavelength of the emission spectrum where the emission intensity is maximum is measured, and this is defined as the maximum peak wavelength (unit: nm).

(Second Light-Emitting Layer)
The second emitting layer contains a second host material, which is a compound different from the first host material contained in the first emitting layer.

The second light-emitting layer contains at least a second light-emitting compound. The second light-emitting compound and the first light-emitting compound may be the same or different from each other, but are preferably the same as each other.
The second emissive compound is preferably a fluorescent emissive compound.

In the organic EL element according to this embodiment, it is preferable that an integral ITG(A) of the emission spectrum within 10 nm around the maximum peak wavelength in the emission spectrum of the second light-emitting compound and a total integral ITG(B) of the emission spectrum of the second light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 3).
40≦{ITG(A)/ITG(B)}×100 (Equation 3)

The integral value ITG(A) of the emission spectrum and the total integral value ITG(B) of the emission spectrum can be calculated by the method described in the examples below.

It is preferable that the second luminescent compound has a maximum peak wavelength of 500 nm or less. It is preferable that the second luminescent compound is a compound that exhibits fluorescent emission with a maximum peak wavelength of 500 nm or less.

The absolute value |LUMO(D2)| of the energy level LUMO(D2) of the lowest unoccupied molecular orbital of the second luminescent compound is preferably 3.25 eV or less, more preferably 3.20 eV or less, and even more preferably 3.15 eV or less.

It is preferable that the full width at half maximum (FWHM) of the maximum peak of the second luminescent compound is 1 nm or more and 30 nm or less.

In the organic EL element according to this embodiment, the second light-emitting compound is preferably a compound that does not contain an azine ring structure in the molecule.

In the organic EL element according to this embodiment, the second light-emitting compound is preferably not a boron-containing complex, and more preferably not a complex.

In the organic EL element according to this embodiment, it is preferable that the second light-emitting layer does not contain a metal complex. It is also preferable that the second light-emitting layer does not contain a boron-containing complex in the organic EL element according to this embodiment.

In the organic EL element according to this embodiment, the second light-emitting layer preferably does not contain a phosphorescent material (dopant material).
The second light-emitting layer preferably does not contain a heavy metal complex or a phosphorescent rare earth metal complex, for example, an iridium complex, an osmium complex, or a platinum complex.

The method for measuring the maximum peak wavelength of a compound is as follows. A 5 μmol/L toluene solution of the compound to be measured is prepared and placed in a quartz cell, and the emission spectrum (vertical axis: emission intensity, horizontal axis: wavelength) of this sample is measured at room temperature (300 K). The emission spectrum can be measured using a spectrofluorophotometer (device name: F-7000) manufactured by Hitachi High-Tech Science Corporation. The emission spectrum measuring device is not limited to the device used here.
In the emission spectrum, the peak wavelength at which the emission intensity is maximum is defined as the maximum peak wavelength. In this specification, the maximum peak wavelength may be referred to as the maximum fluorescent emission peak wavelength (FL-peak). In addition, the full width at half maximum (FWHM) (unit: nm) of the maximum peak of the compound can be measured from the measured emission spectrum.

In the emission spectrum of the second luminescent compound, the peak at which the emission intensity is maximum is defined as the maximum peak, and when the height of the maximum peak is defined as 1, the heights of other peaks appearing in the emission spectrum are preferably less than 0.6. Note that the peaks in the emission spectrum are defined as maximum values.
In addition, it is preferable that the emission spectrum of the second luminescent compound has less than three peaks.

In the organic EL element according to this embodiment, the second light-emitting layer preferably emits light having a maximum peak wavelength of 500 nm or less when the element is in operation.
The maximum peak wavelength of the light emitted from the light-emitting layer when the device is in operation can be measured by the following method.

Maximum peak wavelength λ _EML of light emitted from the light emitting layer when the element is operated
The maximum peak wavelength λ _EML1 of light emitted from the first emitting layer when the element is driven is determined by producing an organic EL element using the same material for the second emitting layer as for the first emitting layer, and measuring the spectral radiance spectrum with a spectroradiometer CS-2000 (manufactured by Konica Minolta, Inc.) when a voltage is applied to the element so that the current density of the organic EL element is 10 mA/ ^cm2 . The maximum peak wavelength λ _EML1 (unit: nm) is calculated from the obtained spectral radiance spectrum.
The maximum peak wavelength λ _EML2 of light emitted from the second emitting layer when the element is driven is determined by producing an organic EL element using the same material for the first emitting layer as for the second emitting layer, and measuring the spectral radiance spectrum with a spectroradiometer CS-2000 (manufactured by Konica Minolta, Inc.) when a voltage is applied to the element so that the current density of the organic EL element is 10 mA/ ^cm2 . The maximum peak wavelength λ _EML2 (unit: nm) is calculated from the obtained spectral radiance spectrum.

In the organic EL element according to this embodiment, it is preferable that the singlet energy S ₁ (H2) of the second host material and the singlet energy S ₁ (D2) of the second light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 7). The singlet energy S ₁ means the energy difference between the lowest excited singlet state and the ground state.
S ₁ (H2)>S ₁ (D2) ... (Equation 7)

When the second host material and the second light-emitting compound satisfy the relationship of the above formula (Mathematical formula 7), the singlet excitons generated on the second host material are easily able to transfer energy from the second host material to the second light-emitting compound, contributing to the fluorescent emission of the second light-emitting compound.

In the organic EL element according to this embodiment, it is preferable that the triplet energy T ₁ (D2) of the second light-emitting compound and the triplet energy T ₁ (H2) of the second host material satisfy the relationship of the following mathematical formula (Mathematical Formula 8).
_T1 (D2)> _T1 (H2) (Equation 8)

When the second host material and the second light-emitting compound satisfy the relationship of the above formula (Mathematical formula 8), triplet excitons generated in the second light-emitting layer move on the second host material rather than on the second light-emitting compound, which has a higher triplet energy, and therefore are more likely to move to the first light-emitting layer.

The organic EL element according to this embodiment preferably satisfies the relationship of the following formula (Mathematical formula 20B).
_T1 (D2)> _T1 (H2)> _T1 (H1) ... (Equation 20B)

(Triplet energy T ₁ )
The triplet energy _T1 can be measured by the following method.
The compound to be measured is dissolved in EPA (diethyl ether:isopentane:ethanol=5:5:2 (volume ratio)) to a concentration of 10 ^-5 mol/L or more and 10 ^-4 mol/L or less, and this solution is placed in a quartz cell to prepare a measurement sample. The phosphorescence spectrum (vertical axis: phosphorescence emission intensity, horizontal axis: wavelength) of this measurement sample is measured at low temperature (77 [K]), a tangent is drawn to the rising edge on the short wavelength side of this phosphorescence spectrum, and the amount of energy calculated from the following conversion formula (F1) based on the wavelength value λ _edge [nm] at the intersection of the tangent and the horizontal axis is defined as the triplet energy _T1 .
Conversion formula (F1): T ₁ [eV]=1239.85/λ _edge

The tangent to the rising edge of the phosphorescence spectrum on the short wavelength side is drawn as follows. When moving along the spectral curve from the short wavelength side of the phosphorescence spectrum to the shortest maximum of the spectral maxima, consider the tangent at each point on the curve toward the long wavelength side. The slope of this tangent increases as the curve rises (i.e., as the vertical axis increases). The tangent drawn at the point where this slope is at its maximum (i.e., the tangent at the inflection point) is the tangent to the rising edge of the phosphorescence spectrum on the short wavelength side.
Note that a maximum point having a peak intensity of 15% or less of the maximum peak intensity of the spectrum is not included in the maximum value on the shortest wavelength side described above, and a tangent drawn at a point where the slope value is the maximum value that is closest to the maximum value on the shortest wavelength side is regarded as a tangent to the rising edge on the short wavelength side of the phosphorescence spectrum.
Phosphorescence can be measured using a spectrofluorophotometer body, Model F-4500, manufactured by Hitachi High-Technologies Corp. However, the measuring device is not limited to this, and measurements may be performed by combining a cooling device, a cryogenic container, an excitation light source, and a light receiving device.

(Singlet energy S ₁ )
As a method for measuring the singlet energy _S1 using a solution (sometimes referred to as a solution method), the following method can be mentioned.
A toluene solution of 10 ^-5 mol/L to 10 ^-4 mol/L of the compound to be measured is prepared and placed in a quartz cell, and the absorption spectrum of this sample (vertical axis: absorption intensity, horizontal axis: wavelength) is measured at room temperature (300 K). A tangent line is drawn to the falling edge on the long wavelength side of this absorption spectrum, and the wavelength value λedge [nm] at the intersection of the tangent line and the horizontal axis is substituted into the following conversion formula (F2) to calculate the singlet energy.
Conversion formula (F2): S ₁ [eV]=1239.85/λedge
An example of an absorption spectrum measuring device is a spectrophotometer manufactured by Hitachi (device name: U3310), but is not limited to this.

The tangent to the fall on the long wavelength side of the absorption spectrum is drawn as follows. When moving on the spectral curve from the maximum value on the longest wavelength side among the maximum values of the absorption spectrum in the direction towards longer wavelengths, consider the tangent at each point on the curve. As the curve falls (i.e., as the value on the vertical axis decreases), the slope of this tangent decreases and then increases repeatedly. The tangent drawn at the point where the slope is at its minimum value on the longest wavelength side (excluding cases where the absorbance is 0.1 or less) is regarded as the tangent to the fall on the long wavelength side of the absorption spectrum.
Note that maximum points with absorbance values of 0.2 or less are not included in the maximum values on the longest wavelength side.

In the organic EL element according to this embodiment, the second light-emitting layer preferably contains the second light-emitting compound in an amount of 0.5% by mass or more of the total mass of the second light-emitting layer. The second light-emitting layer preferably contains the second light-emitting compound in an amount of 10% by mass or less of the total mass of the second light-emitting layer, more preferably contains the second light-emitting compound in an amount of 7% by mass or less of the total mass of the second light-emitting layer, and even more preferably contains the second light-emitting compound in an amount of 5% by mass or less of the total mass of the second light-emitting layer.

In the organic EL element according to this embodiment, the second light-emitting layer preferably contains the second host material in an amount of 60 mass % or more of the total mass of the second light-emitting layer, more preferably contains 70 mass % or more of the total mass of the second light-emitting layer, even more preferably contains 80 mass % or more of the total mass of the second light-emitting layer, even more preferably contains 90 mass % or more of the total mass of the second light-emitting layer, and even more preferably contains 95 mass % or more of the total mass of the second light-emitting layer.
The second emitting layer preferably contains the second host material in an amount of 99.5% by mass or less of the total mass of the second emitting layer.
However, when the second emitting layer contains a second host material and a second emitting compound, the upper limit of the total content of the second host material and the second emitting compound is 100 mass %.

In this embodiment, the second emitting layer may contain a material other than the second host material and the second emitting compound.
The second light-emitting layer may contain only one type of second host material or may contain two or more types of second light-emitting compounds.

In the organic EL element according to this embodiment, the thickness of the second light-emitting layer is preferably 3 nm or more. If the thickness of the second light-emitting layer is 3 nm or more, the thickness is sufficient to cause recombination of holes and electrons in the second light-emitting layer.
In the organic EL element according to this embodiment, the thickness of the second light-emitting layer is preferably 15 nm or less, and more preferably 10 nm or less. If the thickness of the second light-emitting layer is 15 nm or less, the thickness is thin enough for triplet excitons to move to the first light-emitting layer.
In the organic EL element according to this embodiment, the thickness of the second light-emitting layer is more preferably 3 nm or more and 15 nm or less.

(First Light-Emitting Layer)
The first light-emitting layer contains a first host material, which is a compound different from the second host material contained in the second light-emitting layer.

The first light-emitting layer contains at least a first light-emitting compound. The first light-emitting compound is preferably a fluorescent compound.

It is preferable that the maximum peak wavelength of the first luminescent compound is 500 nm or less. It is preferable that the first luminescent compound is a compound that exhibits fluorescent emission with a maximum peak wavelength of 500 nm or less. The method for measuring the maximum peak wavelength of the compound is as described above.

It is also preferable that the energy level HOMO (H1) of the highest occupied molecular orbital of the first host material and the energy level HOMO (D1) of the highest occupied molecular orbital of the first light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 4).
|HOMO(D1)|-|HOMO(H1)|<0.21 eV ... (Equation 4)

When the first host material and the first light-emitting compound satisfy the relationship of the above formula (Mathematical formula 4), holes can easily move to the second light-emitting layer, and holes and electrons can easily recombine in the second light-emitting layer.

In the organic EL element according to this embodiment, it is preferable that the first light-emitting layer emits light having a maximum peak wavelength of 500 nm or less when the element is driven.

In the organic EL element according to this embodiment, it is preferable that the full width at half maximum (FWHM) of the maximum peak of the first light-emitting compound is 1 nm or more and 30 nm or less.

In the organic EL device according to this embodiment, the Stokes shift of the first light-emitting compound is preferably more than 7 nm.
If the Stokes shift of the first luminescent compound exceeds 7 nm, it becomes easier to prevent a decrease in luminous efficiency due to self-absorption.
Self-absorption is a phenomenon in which emitted light is absorbed by the same compound, which causes a decrease in luminous efficiency. Self-absorption is observed prominently in compounds with small Stokes shifts (i.e., compounds with large overlap between the absorption spectrum and the fluorescence spectrum), so in order to suppress self-absorption, it is preferable to use compounds with large Stokes shifts (compounds with small overlap between the absorption spectrum and the fluorescence spectrum).
The Stokes shift can be measured by the following method. The compound to be measured is dissolved in toluene at a concentration of 2.0×10 ⁻⁵ mol/L to prepare a measurement sample. The measurement sample placed in a quartz cell is irradiated with continuous light in the ultraviolet-visible region at room temperature (300K) to measure the absorption spectrum (vertical axis: absorbance, horizontal axis: wavelength). A spectrophotometer can be used to measure the absorption spectrum, for example, a spectrophotometer U-3900/3900H model from Hitachi High-Tech Science Corporation can be used. In addition, the compound to be measured is dissolved in toluene at a concentration of 4.9×10 ⁻⁶ mol/L to prepare a measurement sample. The measurement sample placed in a quartz cell is irradiated with excitation light at room temperature (300K) to measure the fluorescence spectrum (vertical axis: fluorescence intensity, horizontal axis: wavelength). A spectrophotometer can be used to measure the fluorescence spectrum, for example, a spectrofluorometer F-7000 model from Hitachi High-Tech Science Corporation can be used.
From these absorption and fluorescence spectra, the difference between the maximum absorption wavelength and the maximum fluorescence wavelength is calculated to determine the Stokes shift (SS), which is expressed in nm.

In the organic EL element according to this embodiment, it is preferable that the triplet energy T ₁ (H1) of the first host material and the triplet energy T ₁ (D1) of the first light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 6).
_T1 (D1)> _T1 (H1) ... (Equation 6)

In the organic EL element according to this embodiment, the first light-emitting compound and the first host material satisfy the relationship of the above formula (Mathematical formula 6), so that triplet excitons generated in the second light-emitting layer transfer energy to the molecules of the first host material, not to the first light-emitting compound having a higher triplet energy, when they move to the first light-emitting layer. Furthermore, triplet excitons generated by recombination of holes and electrons on the first host material do not transfer to the first light-emitting compound having a higher triplet energy. Triplet excitons generated by recombination on the molecules of the first light-emitting compound transfer energy quickly to the molecules of the first host material.
Triplet excitons of the first host material do not transfer to the first light-emitting compound, but efficiently collide with each other on the first host material due to the TTF phenomenon, thereby generating singlet excitons.

In the organic EL element according to this embodiment, it is preferable that the singlet energy S ₁ (H1) of the first host material and the singlet energy S ₁ (D1) of the first light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 5).
_S1 (H1)> _S1 (D1) ... (Equation 5)

In the organic EL element according to this embodiment, the first light-emitting compound and the first host material satisfy the relationship of the above formula (Mathematical formula 5), and therefore the singlet energy of the first light-emitting compound is smaller than the singlet energy of the first host material. Therefore, the singlet excitons generated by the TTF phenomenon transfer energy from the first host material to the first light-emitting compound, and contribute to the fluorescent emission of the first light-emitting compound.

In the organic EL element according to this embodiment, the first light-emitting compound is preferably a compound that does not contain an azine ring structure in the molecule.

In the organic EL element according to this embodiment, the first light-emitting compound is preferably not a boron-containing complex, and more preferably not a complex.

In the organic EL element according to this embodiment, it is preferable that the first light-emitting layer does not contain a metal complex. It is also preferable that the first light-emitting layer does not contain a boron-containing complex in the organic EL element according to this embodiment.

In the organic EL element according to this embodiment, the first light-emitting layer preferably does not contain a phosphorescent material (dopant material).
The first light-emitting layer preferably does not contain a heavy metal complex or a phosphorescent rare earth metal complex, for example, an iridium complex, an osmium complex, or a platinum complex.

In the organic EL element according to this embodiment, the first light-emitting layer preferably contains the first light-emitting compound in an amount of 0.5% by mass or more of the total mass of the first light-emitting layer. The first light-emitting layer preferably contains the first light-emitting compound in an amount of 10% by mass or less of the total mass of the first light-emitting layer, more preferably contains the first light-emitting compound in an amount of 7% by mass or less of the total mass of the first light-emitting layer, and even more preferably contains the first light-emitting compound in an amount of 5% by mass or less of the total mass of the first light-emitting layer.

The first light-emitting layer preferably contains the first host material in an amount of 60 mass% or more of the total mass of the first light-emitting layer, more preferably 70 mass% or more of the total mass of the first light-emitting layer, even more preferably 80 mass% or more of the total mass of the first light-emitting layer, even more preferably 90 mass% or more of the total mass of the first light-emitting layer, and even more preferably 95 mass% or more of the total mass of the first light-emitting layer.
The first emitting layer preferably contains the first host material in an amount of 99% by mass or less of the total mass of the first emitting layer.
When the first emitting layer contains a first host material and a first emitting compound, the upper limit of the total content of the first host material and the first emitting compound is 100% by mass.

In this embodiment, the first emitting layer may contain a material other than the first host material and the first emitting compound.
The first light-emitting layer may contain only one type of first host material or may contain two or more types of first light-emitting compounds.

The thickness of the first light-emitting layer is preferably greater than the thickness of the second light-emitting layer.
When the thickness of the second emitting layer is thinner than that of the first emitting layer, triplet excitons generated in the second emitting layer do not remain in the second emitting layer but can efficiently diffuse to the first emitting layer, and therefore the thickness of the second emitting layer is preferably thinner than that of the first emitting layer.

In the organic EL element according to this embodiment, the thickness of the first light-emitting layer is preferably 5 nm or more, more preferably 15 nm or more. If the thickness of the first light-emitting layer is 5 nm or more, it is easy to suppress the triplet excitons that have moved from the second light-emitting layer to the first light-emitting layer from returning to the second light-emitting layer. In addition, if the thickness of the first light-emitting layer is 5 nm or more, the triplet excitons can be sufficiently separated from the recombination portion in the second light-emitting layer.
In the organic EL element according to this embodiment, the thickness of the first light-emitting layer is preferably 25 nm or less, and more preferably 20 nm or less. If the thickness of the first light-emitting layer is 25 nm or less, the density of triplet excitons in the first light-emitting layer can be improved, making the TTF phenomenon more likely to occur.
In the organic EL element according to this embodiment, the thickness of the first light-emitting layer is preferably 5 nm or more and 25 nm or less.

In the organic EL element according to this embodiment, it is preferable that the triplet energy T ₁ (DX) of the first light-emitting compound or the second light-emitting compound, the triplet energy T ₁ (H1) of the first host material, and the triplet energy T ₁ (H2) of the second host material satisfy the relationship of the following mathematical formula (Mathematical Formula 10).
2.6 eV> _T1 (DX)> _T1 (H2)> _T1 (H1) ... (Equation 10)

When the first emitting layer contains a first emitting compound, it is preferable that the triplet energy T ₁ (D1) of the first emitting compound satisfies the relationship of the following mathematical formula (Mathematical Formula 10A).
2.6 eV> _T1 (D1)> _T1 (H2)> _T1 (H1) ... (number 10A)

When the second emitting layer contains a second emitting compound, it is preferable that the triplet energy T ₁ (D2) of the second emitting compound satisfies the relationship of the following mathematical formula (Mathematical Formula 10B).
2.6 eV> _T1 (D2)> _T1 (H2)> _T1 (H1) ... (Equation 10B)

In the organic EL element according to this embodiment, it is preferable that the triplet energy T ₁ (DX) of the first light-emitting compound or the second light-emitting compound and the triplet energy T ₁ (H2) of the second host material satisfy the relationship of the following mathematical formula (Mathematical Formula 11).
0 eV<T ₁ (DX)−T ₁ (H2)<0.6 eV (Equation 11)

When the second emitting layer contains a second emitting compound, it is preferable that the triplet energy T ₁ (D2) of the second emitting compound satisfies the relationship of the following mathematical formula (Mathematical Formula 11A).
0 eV<T ₁ (D2)−T ₁ (H2)<0.6 eV (equation 11A)

When the first emitting layer contains a first emitting compound, it is preferable that the triplet energy T ₁ (D1) of the first emitting compound satisfies the relationship of the following mathematical formula (Mathematical Formula 11B).
0 eV<T ₁ (D1)−T ₁ (H1)<0.8 eV (Equation 11B)

In the organic EL element according to this embodiment, it is preferable that the triplet energy T ₁ (H2) of the second host material satisfies the relationship of the following mathematical formula (Mathematical Formula 12).
T ₁ (H2)>2.0 eV (Equation 12)

In the organic EL element according to this embodiment, it is preferable that the triplet energy T ₁ (H2) of the second host material satisfies the relationship of the following formula (Formula 12A), and it is also preferable that the triplet energy T 1 (H2) satisfies the relationship of the following formula (Formula 12B).
T ₁ (H2)>2.10 eV... (Equation 12A)
T ₁ (H2)>2.15 eV... (Equation 12B)

In the organic EL element according to this embodiment, the triplet energy T ₁ (H2) of the second host material satisfies the relationship of the above formula (12A) or (12B), so that triplet excitons generated in the second emitting layer are easily transferred to the first emitting layer and are easily prevented from transferring back from the first emitting layer to the second emitting layer. As a result, singlet excitons are efficiently generated in the first emitting layer, and the luminous efficiency is improved.

In the organic EL element according to this embodiment, it is preferable that the triplet energy T ₁ (H2) of the second host material satisfies the relationship of the following formula (Formula 12C), and it is also preferable that the triplet energy T 1 (H2) of the second host material satisfies the relationship of the following formula (Formula 12D).
2.08 eV> _T1 (H2)>1.87 eV... (Equation 12C)
2.05 eV> _T1 (H2)>1.90 eV... (Equation 12D)

In the organic EL element according to this embodiment, when the triplet energy T ₁ (H2) of the second host material satisfies the relationship of the above-mentioned formula (12C) or (12D), the energy of the triplet excitons generated in the second emitting layer becomes small, and the lifetime of the organic EL element can be expected to be extended.

In the organic EL element according to this embodiment, it is preferable that the triplet energy T 1 (D2) of the second light-emitting compound satisfies the relationship of the following formula (Formula 14C), and it is also preferable that the triplet energy T ₁ (D2) satisfies the relationship of the following formula (Formula 14D).
2.60 eV>T ₁ (D2) ... (Equation 14C)
2.50 eV>T ₁ (D2) ... (Equation 14D)
When the second light-emitting layer contains a compound that satisfies the relationship of the above-mentioned formula (14C) or (14D), the life of the organic EL element is extended.

In the organic EL element according to this embodiment, it is preferable that the triplet energy T 1 (D1) of the first light-emitting compound satisfies the relationship of the following formula (Formula 14A), and it is also preferable that the triplet energy T ₁ (D1) satisfies the relationship of the following formula (Formula 14B).
2.60 eV>T ₁ (D1) ... (Equation 14A)
2.50 eV>T ₁ (D1) ... (Equation 14B)
When the first light-emitting layer contains a compound that satisfies the relationship of the above formula (14A) or (14B), the life of the organic EL element is extended.

In the organic EL element according to this embodiment, it is also preferable that the triplet energy T ₁ (H1) of the first host material satisfies the relationship of the following mathematical formula (Mathematical Formula 13).
T ₁ (H1) ≧ 1.9 eV (Equation 13)

In the organic EL element according to this embodiment, it is also preferable that the triplet energy T ₁ (H2) of the first host material satisfies the relationship of the following mathematical formula (Mathematical Formula 13A).
1.9 eV> _T1 (H1)≧1.8 eV (Equation 13A)

(Other Layers of the Organic EL Element)
The organic EL device according to this embodiment may have one or more organic layers in addition to the first and second light-emitting layers, such as at least one layer selected from the group consisting of a hole injection layer, a hole transport layer, a light-emitting layer, an electron injection layer, an electron transport layer, a hole blocking layer, and an electron blocking layer.

The organic EL element according to this embodiment may be composed of only the first light-emitting layer and the second light-emitting layer, but may further include at least one layer selected from the group consisting of a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, a hole blocking layer, and an electron blocking layer.

In the organic EL element according to this embodiment, it is preferable to include a hole transport layer between the anode and the first light-emitting layer.

In the organic EL element according to this embodiment, it is preferable to include an electron transport layer between the second light-emitting layer and the cathode.

FIG. 1 shows a schematic configuration of an example of an organic EL element according to this embodiment.
The organic EL element 1 includes a light-transmitting substrate 2, an anode 3, a cathode 4, and an organic layer 10 disposed between the anode 3 and the cathode 4. The organic layer 10 is configured by laminating a hole injection layer 6, a hole transport layer 7, a first light-emitting layer 51, a second light-emitting layer 52, an electron transport layer 8, and an electron injection layer 9 in this order from the anode 3 side.

The organic EL element according to this embodiment may further include a third light-emitting layer.
It is preferable that the third emitting layer contains a third host material, the first host material, the second host material, and the third host material are different from one another, the third emitting layer contains at least a third emitting compound, the first emitting compound, the second emitting compound, and the third emitting compound are the same as or different from one another, and the triplet energy T ₁ (H2) of the second host material and the triplet energy T ₁ (H3) of the third host material satisfy the relationship of the following mathematical formula (Mathematical Formula 40).
T ₁ (H2)>T ₁ (H3) ... (Equation 40)

The third luminescent compound is preferably a compound that exhibits luminescence with a maximum peak wavelength of 500 nm or less, and more preferably a compound that exhibits fluorescent emission with a maximum peak wavelength of 500 nm or less.

When the organic EL element according to this embodiment includes a third light-emitting layer, it is preferable that the triplet energy T ₁ (H1) of the first host material and the triplet energy T ₁ (H3) of the third host material satisfy the relationship of the following mathematical formula (Mathematical Formula 41).
T ₁ (H1)>T ₁ (H3) (Equation 41)

In the organic EL element according to this embodiment, it is preferable that the first light-emitting layer and the second light-emitting layer are in direct contact with each other.

In this specification, the layer structure in which "the first light-emitting layer and the second light-emitting layer are in direct contact with each other" may include, for example, any of the following embodiments (LS1), (LS2), and (LS3).
(LS1) An embodiment in which a region in which both the first host material and the second host material are mixed is generated during the process of vapor-depositing a compound for the first emitting layer and the process of vapor-depositing a compound for the second emitting layer, and the region is present at the interface between the first emitting layer and the second emitting layer.
(LS2) When the first emitting layer and the second emitting layer contain a light-emitting compound, a region in which the first host material, the second host material, and the light-emitting compound are mixed is generated during the process of vapor-depositing the compound for the first emitting layer and the process of vapor-depositing the compound for the second emitting layer, and this region is present at the interface between the first emitting layer and the second emitting layer.
(LS3) When the first emitting layer and the second emitting layer contain a light emitting compound, a region made of the light emitting compound, a region made of the first host material, or a region made of the second host material is generated during the process of vapor deposition of the compound for the first emitting layer and the process of vapor deposition of the compound for the second emitting layer, and the region is present at the interface between the first emitting layer and the second emitting layer.

When the organic EL element according to this embodiment includes a third light-emitting layer, it is preferable that the first light-emitting layer and the second light-emitting layer are in direct contact with each other, and that the second light-emitting layer and the third light-emitting layer are in direct contact with each other.

In this specification, the layer structure in which "the second emitting layer and the third emitting layer are in direct contact with each other" may include, for example, any of the following embodiments (LS4), (LS5), and (LS6).
(LS4) An embodiment in which a region in which both the second host material and the third host material are mixed is generated during the process of vapor-depositing the compound for the second emitting layer and the process of vapor-depositing the compound for the third emitting layer, and the region is present at the interface between the second emitting layer and the third emitting layer.
(LS5) When the second emitting layer and the third emitting layer each contain a light emitting compound, a region in which the second host material, the third host material, and the light emitting compound are mixed is generated during the process of vapor deposition of the compound for the second emitting layer and the process of vapor deposition of the compound for the third emitting layer, and this region is present at the interface between the second emitting layer and the third emitting layer.
(LS6) When the second emitting layer and the third emitting layer each contain a light emitting compound, a region made of the light emitting compound, a region made of the second host material, or a region made of the third host material is generated during the process of vapor deposition of the compound for the second emitting layer and the process of vapor deposition of the compound for the third emitting layer, and the region is present at the interface between the second emitting layer and the third emitting layer.

(Intervening layer)
The organic EL element according to this embodiment may also have an intervening layer as an organic layer disposed between the first light-emitting layer and the second light-emitting layer.
In this embodiment, in order to prevent the singlet light-emitting region and the TTF light-emitting region from overlapping, the intervening layer does not contain a light-emitting compound to the extent that this can be realized.
For example, the content of the luminescent compound in the intervening layer is not only 0 mass%, but also, for example, if the luminescent compound is a component that has been unintentionally mixed in during the manufacturing process or a component that is contained as an impurity in the raw materials, it is permissible for the intervening layer to contain these components.
For example, if all of the materials constituting the intermediate layer are material A, material B, and material C, the content of each of material A, material B, and material C in the intermediate layer is 10 mass% or more, and the total content of material A, material B, and material C is 100 mass%.
Hereinafter, the intervening layer may be referred to as a "non-doped layer," and the layer containing a light-emitting compound may be referred to as a "doped layer."

In general, when the light emitting layer has a laminated structure, it is believed that the light emitting efficiency can be improved because the singlet light emitting region and the TTF light emitting region are easily separated.
In the organic EL element of this embodiment, when an intermediate layer (non-doped layer) is disposed between the first and second light-emitting layers in the light-emitting region, the overlapping area between the singlet light-emitting region and the TTF light-emitting region is reduced, and it is expected that the decrease in TTF efficiency caused by collisions between triplet excitons and carriers is suppressed. In other words, the insertion of the intermediate layer (non-doped layer) between the light-emitting layers is considered to contribute to improving the efficiency of TTF light emission.

The intermediate layer is a non-doped layer.
The intervening layer does not contain a metal atom, and therefore does not contain a metal complex.
The intervening layer includes an intervening layer material that is not a light-emitting compound.
The material for the intervening layer is not particularly limited as long as it is a material other than a light-emitting compound.
Examples of the intervening layer material include: 1) heterocyclic compounds such as oxadiazole derivatives, benzimidazole derivatives, and phenanthroline derivatives; 2) condensed aromatic compounds such as carbazole derivatives, anthracene derivatives, phenanthrene derivatives, pyrene derivatives, and chrysene derivatives; and 3) aromatic amine compounds such as triarylamine derivatives and condensed polycyclic aromatic amine derivatives.

The intervening layer material can be either the first host material or the second host material, or both of them, but is not particularly limited as long as it separates the singlet emission region and the TTF emission region and does not inhibit the singlet emission and the TTF emission.

In the organic EL element according to this embodiment, the content of each of the materials constituting the intervening layer in the intervening layer is 10% by mass or more.
The intermediate layer contains the intermediate layer material as a material constituting the intermediate layer.
It is preferable that the intervening layer contains the above-mentioned intervening layer material in an amount of 60 mass% or more of the total mass of the intervening layer, more preferably 70 mass% or more of the total mass of the intervening layer, even more preferably 80 mass% or more of the total mass of the intervening layer, even more preferably 90 mass% or more of the total mass of the intervening layer, and even more preferably 95 mass% or more of the total mass of the intervening layer.
The intervening layer may contain only one type of intervening layer material, or may contain two or more types of intervening layer materials.
When the intervening layer contains two or more types of intervening layer materials, the upper limit of the total content of the two or more intervening layer materials is 100 mass %.
It should be noted that this embodiment does not exclude the inclusion of a material other than the intermediate layer material in the intermediate layer.

The intervening layer may be a single layer or may be a laminate of two or more layers.

The thickness of the intermediate layer is not particularly limited as long as it can prevent the singlet light-emitting region and the TTF light-emitting region from overlapping, but is preferably 3 nm to 15 nm, and more preferably 5 nm to 10 nm, per layer.
If the thickness of the intervening layer is 3 nm or more, the singlet light-emitting region and the light-emitting region derived from TTF can be easily separated.
If the thickness of the intermediate layer is 15 nm or less, it is easy to suppress the phenomenon in which the host material of the intermediate layer emits light.

It is preferable that the intervening layer contains an intervening layer material as a material constituting the intervening layer, and that the triplet energy T ₁ (H1) of the first host material, the triplet energy T ₁ (H2) of the second host material, and the triplet energy T ₁ (M _mid ) of at least one intervening layer material satisfy the relationship of the following mathematical formula (Mathematical Formula 21).
_T1 (H2) ≥ _T1 ( _Mmid ) ≥ _T1 (H1) (Equation 21)

When the intermediate layer contains two or more intermediate layer materials as materials constituting the intermediate layer, it is more preferable that the triplet energy T ₁ (H1) of the first host material, the triplet energy T ₁ (H2) of the second host material, and the triplet energy T ₁ ( _MEA ) of each intermediate layer material satisfy the relationship of the following mathematical formula (Mathematical Formula 21A).
_T1 (H2) ≥ _T1 ( _MEA ) ≥ _T1 (H1) ... (Equation 21A)

The structure of the organic EL element will be further explained. Hereinafter, reference numbers may be omitted.

(substrate)
The substrate is used as a support for the organic EL element. For example, glass, quartz, plastic, etc. can be used as the substrate. A flexible substrate may also be used. A flexible substrate is a substrate that can be bent (flexible), and examples thereof include a plastic substrate. Examples of materials for forming the plastic substrate include polycarbonate, polyarylate, polyethersulfone, polypropylene, polyester, polyvinyl fluoride, polyvinyl chloride, polyimide, and polyethylene naphthalate. An inorganic deposition film may also be used.

(anode)
For the anode formed on the substrate, it is preferable to use a metal, alloy, electrically conductive compound, or a mixture thereof having a large work function (specifically, 4.0 eV or more). Specific examples include indium oxide-tin oxide (ITO), indium oxide-tin oxide containing silicon or silicon oxide, indium oxide-zinc oxide, tungsten oxide, indium oxide containing zinc oxide, graphene, and the like. Other examples include gold (Au), platinum (Pt), nickel (Ni), tungsten (W), chromium (Cr), molybdenum (Mo), iron (Fe), cobalt (Co), copper (Cu), palladium (Pd), titanium (Ti), or nitrides of metal materials (e.g., titanium nitride), and the like.

These materials are usually formed into a film by sputtering. For example, indium oxide-zinc oxide can be formed by sputtering using a target containing 1% to 10% by mass of zinc oxide added to indium oxide. In addition, for example, indium oxide containing tungsten oxide and zinc oxide can be formed by sputtering using a target containing 0.5% to 5% by mass of tungsten oxide and 0.1% to 1% by mass of zinc oxide relative to indium oxide. In addition, it may be formed by vacuum deposition, coating, inkjet, spin coating, etc.

Of the EL layers formed on the anode, the hole injection layer formed in contact with the anode is formed using a composite material that allows easy hole injection regardless of the work function of the anode, so materials that can be used as electrode materials (for example, metals, alloys, electrically conductive compounds, and mixtures of these, including other elements belonging to Groups 1 or 2 of the periodic table) can be used.

Materials with small work functions, such as elements belonging to Group 1 or 2 of the periodic table, i.e., alkali metals such as lithium (Li) and cesium (Cs), alkaline earth metals such as magnesium (Mg), calcium (Ca), and strontium (Sr), and alloys containing these (e.g., MgAg, AlLi), rare earth metals such as europium (Eu), ytterbium (Yb), and alloys containing these, can also be used. When alkali metals, alkaline earth metals, and alloys containing these are used to form the anode, vacuum deposition and sputtering methods can be used. Furthermore, when silver paste or the like is used, coating methods, inkjet methods, and the like can be used.

(cathode)
For the cathode, it is preferable to use a metal, alloy, electrically conductive compound, or mixture thereof having a small work function (specifically, 3.8 eV or less). Specific examples of such a cathode material include elements belonging to Group 1 or Group 2 of the periodic table, i.e., alkali metals such as lithium (Li) and cesium (Cs), alkaline earth metals such as magnesium (Mg), calcium (Ca), and strontium (Sr), and alloys containing these (e.g., MgAg, AlLi), rare earth metals such as europium (Eu), ytterbium (Yb), and alloys containing these.

When forming a cathode using an alkali metal, an alkaline earth metal, or an alloy containing these, a vacuum deposition method or a sputtering method can be used. When using a silver paste, a coating method or an inkjet method can be used.

By providing an electron injection layer, the cathode can be formed using various conductive materials, such as Al, Ag, ITO, graphene, and indium oxide-tin oxide containing silicon or silicon oxide, regardless of the magnitude of the work function. These conductive materials can be deposited using a sputtering method, inkjet method, spin coating method, etc.

(Hole Injection Layer)
The hole injection layer is a layer containing a substance with high hole injection properties, such as molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, manganese oxide, etc.

In addition, examples of substances with high hole injection properties include low molecular weight organic compounds such as 4,4',4''-tris(N,N-diphenylamino)triphenylamine (abbreviation: TDATA), 4,4',4''-tris[N-(3-methylphenyl)-N-phenylamino]triphenylamine (abbreviation: MTDATA), 4,4'-bis[N-(4-diphenylaminophenyl)-N-phenylamino]biphenyl (abbreviation: DPAB), 4,4'-bis(N-{4-[N'-(3-methylphenyl)-N'-phenylamino]phenyl}-N-phenylamino)biphenyl (abbreviation: DNTPD), and 1,3,5-tris[N-(4-diphenylaminophenyl)-N-phenylamino]biphenyl (abbreviation: DNTPD). Other examples include aromatic amine compounds such as [N-(9-phenylcarbazol-3-yl)-N-phenylamino]benzene (abbreviation: DPA3B), 3-[N-(9-phenylcarbazol-3-yl)-N-phenylamino]-9-phenylcarbazole (abbreviation: PCzPCA1), 3,6-bis[N-(9-phenylcarbazol-3-yl)-N-phenylamino]-9-phenylcarbazole (abbreviation: PCzPCA2), and 3-[N-(1-naphthyl)-N-(9-phenylcarbazol-3-yl)amino]-9-phenylcarbazole (abbreviation: PCzPCN1), as well as dipyrazino[2,3-f:20,30-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile (HAT-CN).

As a substance with high hole injection properties, a polymer compound (oligomer, dendrimer, polymer, etc.) can also be used. For example, polymer compounds such as poly(N-vinylcarbazole) (abbreviation: PVK), poly(4-vinyltriphenylamine) (abbreviation: PVTPA), poly[N-(4-{N'-[4-(4-diphenylamino)phenyl]phenyl-N'-phenylamino}phenyl)methacrylamide] (abbreviation: PTPDMA), poly[N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)benzidine] (abbreviation: Poly-TPD) can be used. In addition, a polymer compound to which an acid is added, such as poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonic acid) (PEDOT/PSS) or polyaniline/poly(styrenesulfonic acid) (PAni/PSS), can also be used.

(Hole transport layer)
The hole transport layer is a layer containing a substance with high hole transport properties. For the hole transport layer, an aromatic amine compound, a carbazole derivative, an anthracene derivative, or the like can be used. Specifically, 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (abbreviation: NPB), N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (abbreviation: TPD), 4-phenyl-4'-(9-phenylfluoren-9-yl)triphenylamine (abbreviation: BAFLP), 4,4'-bis[N-(9,9-dimethylfluoren-2-yl)-N-phenylamino]biphenyl, etc. can be used. Examples of the aromatic amine compounds that can be used include aromatic amine compounds such as 4,4',4''-tris(N,N-diphenylamino)triphenylamine (abbreviation: TDATA), 4,4',4''-tris[N-(3-methylphenyl)-N-phenylamino]triphenylamine (abbreviation: MTDATA), and 4,4'-bis[N-(spiro-9,9'-bifluoren-2-yl)-N-phenylamino]biphenyl (abbreviation: BSPB). The substances described here are mainly substances having a hole mobility of 10 ^-6 cm ² /(V·s) or more.

For the hole transport layer, carbazole derivatives such as CBP, 9-[4-(N-carbazolyl)]phenyl-10-phenylanthracene (CzPA), and 9-phenyl-3-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole (PCzPA), and anthracene derivatives such as t-BuDNA, DNA, and DPAnth may be used. Polymer compounds such as poly(N-vinylcarbazole) (abbreviated as PVK) and poly(4-vinyltriphenylamine) (abbreviated as PVTPA) may also be used.

However, other substances may be used as long as they have a higher hole transporting property than electron transporting property. Note that the layer containing the substance having a high hole transporting property may be not only a single layer, but also a stack of two or more layers made of the above substances.

(Electron Transport Layer)
The electron transport layer is a layer containing a substance with high electron transport properties. For the electron transport layer, 1) a metal complex such as an aluminum complex, a beryllium complex, or a zinc complex, 2) a heteroaromatic compound such as an imidazole derivative, a benzimidazole derivative, an azine derivative, a carbazole derivative, or a phenanthroline derivative, or 3) a polymer compound can be used. Specifically, as a low molecular weight organic compound, a metal complex such as Alq, tris(4-methyl-8-quinolinolato)aluminum (abbreviation: Almq ₃ ), bis(10-hydroxybenzo[h]quinolinato)beryllium (abbreviation: BeBq ₂ ), BAlq, Znq, ZnPBO, or ZnBTZ can be used. In addition to metal complexes, 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (abbreviation: PBD), 1,3-bis[5-(ptert-butylphenyl)-1,3,4-oxadiazol-2-yl]benzene (abbreviation: OXD-7), 3-(4-tert-butylphenyl)-4-phenyl-5-(4-biphenylyl)-1,2,4-triazole (abbreviation: Heteroaromatic compounds such as 3-(4-tert-butylphenyl)-4-(4-ethylphenyl)-5-(4-biphenylyl)-1,2,4-triazole (abbreviation: p-EtTAZ), bathophenanthroline (abbreviation: BPhen), bathocuproine (abbreviation: BCP), and 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene (abbreviation: BzOs) can also be used. In this embodiment, a benzimidazole compound can be preferably used. The substances described here are mainly substances having an electron mobility of 10 ^-6 cm ² /(V·s) or more. Note that, as long as the substance has a higher electron transporting property than a hole transporting property, a substance other than the above may be used as the electron transporting layer. In addition, the electron transporting layer may be formed of a single layer, or may be formed by stacking two or more layers made of the above substances.

In addition, a polymer compound can be used for the electron transport layer. For example, poly[(9,9-dihexylfluorene-2,7-diyl)-co-(pyridine-3,5-diyl)] (abbreviation: PF-Py), poly[(9,9-dioctylfluorene-2,7-diyl)-co-(2,2'-bipyridine-6,6'-diyl)] (abbreviation: PF-BPy), etc. can be used.

(Electron Injection Layer)
The electron injection layer is a layer containing a substance with high electron injection properties. For the electron injection layer, alkali metals, alkaline earth metals, or compounds thereof, such as lithium (Li), cesium (Cs), calcium (Ca), lithium fluoride (LiF), cesium fluoride (CsF), calcium fluoride (CaF ₂ ), lithium oxide (LiOx), etc., can be used. In addition, a substance having electron transport properties containing an alkali metal, an alkaline earth metal, or a compound thereof, specifically, a substance containing magnesium (Mg) in Alq, etc., can be used. In this case, electron injection from the cathode can be performed more efficiently.

Alternatively, a composite material obtained by mixing an organic compound and an electron donor (donor) may be used for the electron injection layer. Such a composite material has excellent electron injection and electron transport properties because electrons are generated in the organic compound by the electron donor. In this case, the organic compound is preferably a material that is excellent in transporting the generated electrons, and specifically, for example, the above-mentioned substances constituting the electron transport layer (metal complexes, heteroaromatic compounds, etc.) can be used. The electron donor may be any substance that exhibits electron donating properties to the organic compound. Specifically, alkali metals, alkaline earth metals, and rare earth metals are preferred, and examples of such substances include lithium, cesium, magnesium, calcium, erbium, and ytterbium. Furthermore, alkali metal oxides and alkaline earth metal oxides are preferred, and examples of such substances include lithium oxide, calcium oxide, and barium oxide. Furthermore, a Lewis base such as magnesium oxide can also be used. Furthermore, an organic compound such as tetrathiafulvalene (abbreviation: TTF) can also be used.

(Layer Formation Method)
The method for forming each layer of the organic EL element of the present embodiment is not limited to those specifically mentioned above, but may be any known method, such as a dry film formation method, such as a vacuum deposition method, a sputtering method, a plasma method, or an ion plating method, or a wet film formation method, such as a spin coating method, a dipping method, a flow coating method, or an inkjet method.

(Film Thickness)
The thickness of each organic layer of the organic EL element of the present embodiment is not limited unless otherwise specified above. In general, if the thickness is too thin, defects such as pinholes are likely to occur, and if the thickness is too thick, a high applied voltage is required, resulting in poor efficiency. Therefore, the thickness of each organic layer of the organic EL element is usually preferably in the range of several nm to 1 μm.

(First Host Material, Second Host Material, and Third Host Material)
In the organic EL element according to this embodiment, the first host material and the second host material are not particularly limited as long as they are different from each other and are compounds that satisfy the above formula (Formula 1) and formula (Formula 2). In the organic EL element according to this embodiment, the third host material is not particularly limited as long as it is a compound that satisfies the relationship of the above formula (Formula 40).
It is also preferable that the first host material, the second host material, and the third host material are each independently any compound selected from the group consisting of compounds represented by the following general formula (1), general formula (1X), general formula (12X), general formula (13X), general formula (14X), general formula (15X), general formula (16X), and general formula (2).

(Compound represented by general formula (2))
In this embodiment, the first host material is preferably, for example, a compound represented by the following general formula (2).

(In the general formula (2),
R ₂₀₁ to R ₂₀₈ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a group represented by -N(R ₉₀₆ )(R ₉₀₇ );
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
L ₂₀₁ and L ₂₀₂ each independently represent
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
Ar ₂₀₁ and Ar ₂₀₂ are each independently
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In the compound represented by the general formula (2) according to this embodiment, R ₉₀₁ , R ₉₀₂ , R ₉₀₃ , R ₉₀₄ , R ₉₀₅ , R ₉₀₆ , R ₉₀₇ , R ₈₀₁ and R ₈₀₂ are each independently
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
When a plurality of R ₉₀₁ are present, the plurality of R ₉₀₁ are the same or different,
When a plurality of R ₉₀₂ are present, the plurality of R ₉₀₂ are the same or different,
When a plurality of R ₉₀₃ are present, the plurality of R ₉₀₃ are the same or different from each other,
When a plurality of R ₉₀₄ are present, the plurality of R ₉₀₄ are the same or different from each other,
When a plurality of R ₉₀₅ are present, the plurality of R ₉₀₅ are the same or different from each other,
When a plurality of R ₉₀₆ are present, the plurality of R ₉₀₆ are the same or different from each other,
When a plurality of R _907s are present, the plurality of R _907s are the same or different from each other,
When a plurality of R ₈₀₁ are present, the plurality of R ₈₀₁ are the same or different from each other,
When a plurality of R ₈₀₂ are present, the plurality of R ₈₀₂ are the same or different.

In the organic EL element according to this embodiment,
R ₂₀₁ to R ₂₀₈ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a group represented by -N(R ₉₀₆ )(R ₉₀₇ );
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
a cyano group or a nitro group;
L ₂₀₁ and L ₂₀₂ each independently represent
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
Ar ₂₀₁ and Ar ₂₀₂ are each independently
It is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In the organic EL element according to this embodiment,
L ₂₀₁ and L ₂₀₂ each independently represent
a single bond, or a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms,
It is preferable that Ar ₂₀₁ and Ar ₂₀₂ each independently represent a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In the organic EL element according to this embodiment,
Ar ₂₀₁ and Ar ₂₀₂ are each independently
Phenyl group,
naphthyl group,
A phenanthryl group,
Biphenyl group,
terphenyl group,
Diphenylfluorenyl group,
Dimethylfluorenyl group,
Benzodiphenylfluorenyl group,
Benzodimethylfluorenyl group,
Dibenzofuranyl group,
Dibenzothienyl group,
A naphthobenzofuranyl group or a naphthobenzothienyl group is preferred.

In the organic EL element according to this embodiment, the compound represented by the general formula (2) is preferably a compound represented by the following general formula (201), general formula (202), general formula (203), general formula (204), general formula (205), general formula (206), general formula (207), general formula (208) or general formula (209).

(In the general formulae (201) to (209),
L ₂₀₁ and Ar ₂₀₁ have the same meanings as L ₂₀₁ and Ar ₂₀₁ in formula (2).
R ₂₀₁ to R ₂₀₈ each independently have the same meaning as R ₂₀₁ to R ₂₀₈ in formula (2).

The compound represented by the general formula (2) is also preferably a compound represented by the following general formula (221), general formula (222), general formula (223), general formula (224), general formula (225), general formula (226), general formula (227), general formula (228) or general formula (229).

(In the general formula (221), the general formula (222), the general formula (223), the general formula (224), the general formula (225), the general formula (226), the general formula (227), the general formula (228) and the general formula (229),
R ₂₀₁ and R ₂₀₃ to R ₂₀₈ each independently have the same definition as R ₂₀₁ and R ₂₀₃ to R ₂₀₈ in formula (2);
L ₂₀₁ and Ar ₂₀₁ are the same as L ₂₀₁ and Ar ₂₀₁ in formula (2), respectively;
L ₂₀₃ has the same meaning as L ₂₀₁ in formula (2).
L ₂₀₃ and L ₂₀₁ are the same or different;
Ar ₂₀₃ has the same meaning as Ar ₂₀₁ in the general formula (2).
Ar ₂₀₃ and Ar ₂₀₁ are the same or different.

The compound represented by the general formula (2) is also preferably a compound represented by the following general formula (241), general formula (242), general formula (243), general formula (244), general formula (245), general formula (246), general formula (247), general formula (248) or general formula (249).

(In the general formula (241), the general formula (242), the general formula (243), the general formula (244), the general formula (245), the general formula (246), the general formula (247), the general formula (248) and the general formula (249),
R ₂₀₁ , R ₂₀₂ , and R ₂₀₄ to R ₂₀₈ each independently have the same definition as R ₂₀₁ , R ₂₀₂ , and R ₂₀₄ to R ₂₀₈ in formula (2);
L ₂₀₁ and Ar ₂₀₁ are the same as L ₂₀₁ and Ar ₂₀₁ in formula (2), respectively;
L ₂₀₃ has the same meaning as L ₂₀₁ in formula (2).
L ₂₀₃ and L ₂₀₁ are the same or different;
Ar ₂₀₃ has the same meaning as Ar ₂₀₁ in the general formula (2).
Ar ₂₀₃ and Ar ₂₀₁ are the same or different.

In the compound represented by the general formula (2), R ₂₀₁ to R ₂₀₈ which are not a group represented by the general formula (21) each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
A substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, or a group represented by --Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ) is preferred.

_L101 is,
a single bond, or an unsubstituted arylene group having 6 to 22 ring carbon atoms,
Ar ₁₀₁ is preferably a substituted or unsubstituted aryl group having 6 to 22 ring carbon atoms.

In the organic EL element according to this embodiment, in the compound represented by the general formula (2), R ₂₀₁ to R ₂₀₈ are each preferably independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, or a group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ).

In the organic EL device according to this embodiment, in the compound represented by the general formula (2), R ₂₀₁ to R ₂₀₈ are preferably hydrogen atoms.

In the compound represented by the general formula (2), it is preferable that all of the groups described as "substituted or unsubstituted" are "unsubstituted" groups.

(Method for producing a compound represented by formula (2))
The compound represented by the general formula (2) can be produced by a known method. The compound represented by the general formula (2) can also be produced by following a known method and using known alternative reactions and raw materials suited to the target product.

(Specific examples of compounds represented by formula (2))
Specific examples of the compound represented by the general formula (2) include the following compounds. However, the present invention is not limited to these specific examples of the compound represented by the general formula (2).

(Compound represented by general formula (1))
In this embodiment, the second host material is preferably, for example, a compound represented by the following general formula (1).

(In the general formula (1),
R ₁₀₁ to R ₁₁₀ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, or a group represented by the general formula (11),
However, at least one of R ₁₀₁ to R ₁₁₀ is a group represented by the general formula (11).
When a plurality of groups represented by the general formula (11) are present, the plurality of groups represented by the general formula (11) are the same or different from each other,
_L101 is,
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
Ar ₁₀₁ is
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
mx is 0, 1, 2, 3, 4 or 5;
When two or more L ₁₀₁ are present, the two or more L ₁₀₁ are the same or different,
When two or more Ar ₁₀₁ are present, the two or more Ar ₁₀₁ are the same or different from each other,
In the general formula (11), * indicates the bonding position with the pyrene ring in the general formula (1).

(In the compounds relating to the first host material, the second host material and the third host material, R ₉₀₁ , R ₉₀₂ , R ₉₀₃ , R ₉₀₄ , R ₉₀₅ , R ₉₀₆ , R ₉₀₇ , R ₈₀₁ and R ₈₀₂ are each independently
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
When a plurality of R ₉₀₁ are present, the plurality of R ₉₀₁ are the same or different,
When a plurality of R ₉₀₂ are present, the plurality of R ₉₀₂ are the same or different,
When a plurality of R ₉₀₃ are present, the plurality of R ₉₀₃ are the same or different from each other,
When a plurality of R ₉₀₄ are present, the plurality of R ₉₀₄ are the same or different from each other,
When a plurality of R ₉₀₅ are present, the plurality of R ₉₀₅ are the same or different from each other,
When a plurality of R ₉₀₆ are present, the plurality of R ₉₀₆ are the same or different from each other,
When a plurality of R _907s are present, the plurality of R _907s are the same or different from each other,
When a plurality of R ₈₀₁ are present, the plurality of R ₈₀₁ are the same or different from each other,
When a plurality of R ₈₀₂ are present, the plurality of R ₈₀₂ are the same or different.

In the organic EL element according to this embodiment, the group represented by the general formula (11) is preferably a group represented by the following general formula (111):

(In the general formula (111),
X ₁ is CR ₁₂₃ R ₁₂₄ , an oxygen atom, a sulfur atom, or NR ₁₂₅ ;
L ₁₁₁ and L ₁₁₂ each independently represent
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
ma is 0, 1, 2, 3 or 4;
mb is 0, 1, 2, 3 or 4;
ma+mb is 0, 1, 2, 3 or 4;
Ar ₁₀₁ has the same meaning as Ar ₁₀₁ in the general formula (11).
R ₁₂₁ , R ₁₂₂ , R ₁₂₃ , R ₁₂₄ and R ₁₂₅ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
mc is 3;
Three R ₁₂₁ are the same or different;
md is 3;
The three R ₁₂₂ are the same or different.

Of the positions *1 to *8 of carbon atoms in the ring structure represented by the following general formula (111a) in the group represented by general formula (111), L ₁₁₁ is bonded to any one of the positions *1 to *4, R ₁₂₁ is bonded to the remaining three positions *1 to *4, L ₁₁₂ is bonded to any one of the positions *5 to *8, and R ₁₂₂ is bonded to the remaining three positions *5 to *8.

For example, in the group represented by the general formula (111), when L ₁₁₁ is bonded to the position of the carbon atom marked *2 in the ring structure represented by the general formula (111a) and L ₁₁₂ is bonded to the position of the carbon atom marked *7 in the ring structure represented by the general formula (111a), the group represented by the general formula (111) is represented by the following general formula (111b).

(In the general formula (111b),
X ₁ , L ₁₁₁ , L ₁₁₂ , ma, mb, Ar ₁₀₁ , R ₁₂₁ , R ₁₂₂ , R ₁₂₃ , R ₁₂₄ and R ₁₂₅ each independently have the same meaning as X ₁ , L ₁₁₁ , L ₁₁₂ , ma, mb, Ar ₁₀₁ , R ₁₂₁ , R ₁₂₂ , R ₁₂₃ , R ₁₂₄ and R ₁₂₅ in formula (111);
R ₁₂₁ is the same or different from each other,
Multiple R ₁₂₂ are the same or different.

In the organic EL element according to this embodiment, the group represented by the general formula (111) is preferably a group represented by the general formula (111b).

In the organic EL element according to this embodiment, it is preferable that ma is 0, 1 or 2, and mb is 0, 1 or 2.

In the organic EL element according to this embodiment, ma is preferably 0 or 1, and mb is preferably 0 or 1.

In the organic EL device according to this embodiment, Ar ₁₀₁ is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In the organic EL element according to this embodiment, Ar ₁₀₁ is preferably a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted pyrenyl group, a substituted or unsubstituted phenanthryl group, or a substituted or unsubstituted fluorenyl group.

In the organic EL element according to this embodiment, Ar ₁₀₁ is also preferably a group represented by the following formula (12), (13), or (14).

(In the general formula (12), general formula (13) and general formula (14),
R ₁₁₁ to R ₁₂₀ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a group represented by -N(R ₉₀₆ )(R ₉₀₇ );
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₁₂₄ ,
A group represented by —COOR ₁₂₅ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
In the general formulae (12), (13) and (14), * indicates the bonding position with L ₁₀₁ in the general formula (11), or the bonding position with L ₁₁₂ in the general formula (111) or (111b).

In the organic EL element according to this embodiment, the compound represented by the general formula (1) is preferably represented by the following general formula (101):

(In the general formula (101),
R ₁₀₁ to R ₁₂₀ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
provided that one of R ₁₀₁ to R ₁₁₀ represents a bonding position with L ₁₀₁ , and one of R ₁₁₁ to R ₁₂₀ represents a bonding position with L ₁₀₁ ;
_L101 is,
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
mx is 0, 1, 2, 3, 4 or 5;
When two or more L ₁₀₁ are present, the two or more L ₁₀₁ are the same or different.

In the organic EL device according to this embodiment, L ₁₀₁ is preferably a single bond or a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms.

In the organic EL element according to this embodiment, the first compound is preferably represented by the following general formula (102):

(In the general formula (102),
R ₁₀₁ to R ₁₂₀ each independently have the same definition as R ₁₀₁ to R ₁₂₀ in formula (101);
provided that one of R ₁₀₁ to R ₁₁₀ represents a bonding position with L ₁₁₁ , and one of R ₁₁₁ to R ₁₂₀ represents a bonding position with L ₁₁₂ ;
X ₁ is CR ₁₂₃ R ₁₂₄ , an oxygen atom, a sulfur atom, or NR ₁₂₅ ;
L ₁₁₁ and L ₁₁₂ each independently represent
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
ma is 0, 1, 2, 3 or 4;
mb is 0, 1, 2, 3 or 4;
ma+mb is 0, 1, 2, 3 or 4;
R ₁₂₁ , R ₁₂₂ , R ₁₂₃ , R ₁₂₄ and R ₁₂₅ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
mc is 3;
Three R ₁₂₁ are the same or different;
md is 3;
The three R ₁₂₂ are the same or different.

In the compound represented by the general formula (102), ma is 0, 1 or 2,
It is preferred that mb is 0, 1 or 2.

In the compound represented by the general formula (102), ma is preferably 0 or 1, and mb is preferably 0 or 1.

In the organic EL element according to this embodiment, it is preferable that two or more of R ₁₀₁ to R ₁₁₀ are a group represented by the general formula (11).

In the organic EL element according to this embodiment, it is preferable that two or more of R ₁₀₁ to R ₁₁₀ are groups represented by the general formula (11), and Ar ₁₀₁ is a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In the organic EL element according to this embodiment, it is preferable that Ar ₁₀₁ is not a substituted or unsubstituted pyrenyl group, L ₁₀₁ is not a substituted or unsubstituted pyrenylene group, and the substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms as R ₁₀₁ to R ₁₁₀ which are not a group represented by general formula (11) are not a substituted or unsubstituted pyrenyl group.

In the organic EL element according to this embodiment,
R ₁₀₁ to R ₁₁₀ which are not a group represented by the general formula (11) each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
It is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In the organic EL element according to this embodiment, it is preferable that R ₁₀₁ to R ₁₁₀ that are not the group represented by the general formula (11) are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, or a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms.

In the organic EL element according to this embodiment, R ₁₀₁ to R ₁₁₀ that are not the group represented by formula (11) are preferably hydrogen atoms.

(Compound represented by general formula (1X))
In the organic EL element according to this embodiment, the second host material is also preferably a compound represented by the following general formula (1X).

(In the general formula (1X),
R ₁₀₁ to R ₁₁₂ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, or a group represented by general formula (11X),
However, at least one of R ₁₀₁ to R ₁₁₂ is a group represented by the general formula (11X).
When a plurality of groups represented by the general formula (11X) are present, the plurality of groups represented by the general formula (11X) are the same or different from each other,
_L101 is,
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
Ar ₁₀₁ is
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
mx is 1, 2, 3, 4 or 5;
When two or more L ₁₀₁ are present, the two or more L ₁₀₁ are the same or different,
When two or more Ar ₁₀₁ are present, the two or more Ar ₁₀₁ are the same or different from each other,
In the general formula (11X), * indicates the bonding position to the benz[a]anthracene ring in the general formula (1X).

In the organic EL element according to this embodiment, the group represented by the general formula (11X) is preferably a group represented by the following general formula (111X):

(In the general formula (111X),
X ₁ is CR ₁₄₃ R ₁₄₄ , an oxygen atom, a sulfur atom, or NR ₁₄₅ ;
L ₁₁₁ and L ₁₁₂ each independently represent
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
ma is 1, 2, 3 or 4;
mb is 1, 2, 3 or 4;
ma+mb is 2, 3 or 4;
Ar ₁₀₁ has the same meaning as Ar ₁₀₁ in the general formula (11X).
R ₁₄₁ , R ₁₄₂ , R ₁₄₃ , R ₁₄₄ and R ₁₄₅ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
mc is 3;
Three R ₁₄₁ are the same or different;
md is 3;
The three R ₁₄₂ are the same or different.

Of the positions *1 to *8 of carbon atoms in the ring structure represented by the following general formula (111aX) in the group represented by general formula (111X), L ₁₁₁ is bonded to any one of the positions *1 to *4, R ₁₄₁ is bonded to the remaining three positions *1 to *4, L ₁₁₂ is bonded to any one of the positions *5 to *8, and R ₁₄₂ is bonded to the remaining three positions *5 to *8.

For example, in the group represented by general formula (111X), when L ₁₁₁ is bonded to the position of the carbon atom marked *2 in the ring structure represented by general formula (111aX) and L ₁₁₂ is bonded to the position of the carbon atom marked *7 in the ring structure represented by general formula (111aX), the group represented by general formula (111X) is represented by the following general formula (111bX).

(In the general formula (111bX),
X ₁ , L ₁₁₁ , L ₁₁₂ , ma, mb, Ar ₁₀₁ , R ₁₄₁ , R ₁₄₂ , R ₁₄₃ , R ₁₄₄ and R ₁₄₅ each independently have the same meaning as X ₁ , L ₁₁₁ , L ₁₁₂ , ma, mb, Ar ₁₀₁ , R ₁₄₁ , R ₁₄₂ , R ₁₄₃ , R ₁₄₄ and R ₁₄₅ in formula (111X);
R ₁₄₁ is the same or different from each other,
Multiple R ₁₄₂ are the same or different.

In the organic EL element according to this embodiment, the group represented by the general formula (111X) is preferably a group represented by the general formula (111bX).

In the compound represented by the general formula (1X), ma is preferably 1 or 2, and mb is preferably 1 or 2.

In the compound represented by the general formula (1X), ma is preferably 1 and mb is preferably 1.

In the compound represented by the general formula (1X), Ar ₁₀₁ is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In the compound represented by the general formula (1X), Ar ₁₀₁ is
a substituted or unsubstituted phenyl group,
a substituted or unsubstituted naphthyl group,
a substituted or unsubstituted biphenyl group,
a substituted or unsubstituted terphenyl group;
a substituted or unsubstituted benz[a]anthryl group,
a substituted or unsubstituted pyrenyl group,
A substituted or unsubstituted phenanthryl group, or a substituted or unsubstituted fluorenyl group is preferred.

The compound represented by the general formula (1X) is also preferably represented by the following general formula (101X):

(In the general formula (101X),
one of R ₁₁₁ and R ₁₁₂ represents a bonding position to L ₁₀₁ , one of R ₁₃₃ and R ₁₃₄ represents a bonding position to L ₁₀₁ ;
R ₁₀₁ to R ₁₁₀ , R ₁₂₁ to R ₁₃₀ , R ₁₁₁ or R ₁₁₂ which is not a bonding position to L ₁₀₁ , and R ₁₃₃ or R ₁₃₄ which is not a bonding position to L ₁₀₁ each independently represent:
Hydrogen atom,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
_L101 is,
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
mx is 1, 2, 3, 4 or 5;
When two or more L ₁₀₁ are present, the two or more L ₁₀₁ are the same or different.

In the compound represented by the general formula (1X), L ₁₀₁ is preferably a single bond, or a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms.

The compound represented by the general formula (1X) is also preferably represented by the following general formula (102X):

(In the general formula (102X),
one of R ₁₁₁ and R ₁₁₂ represents a bonding position to L ₁₁₁ , one of R ₁₃₃ and R ₁₃₄ represents a bonding position to L ₁₁₂ ;
R ₁₀₁ to R ₁₁₀ , R ₁₂₁ to R ₁₃₀ , R ₁₁₁ or R ₁₁₂ which is not a bonding position to L ₁₁₁ , and R ₁₃₃ or R ₁₃₄ which is not a bonding position to L ₁₁₂ each independently represent:
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
X ₁ is CR ₁₄₃ R ₁₄₄ , an oxygen atom, a sulfur atom, or NR ₁₄₅ ;
L ₁₁₁ and L ₁₁₂ each independently represent
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
ma is 1, 2, 3 or 4;
mb is 1, 2, 3 or 4;
ma+mb is 2, 3, 4 or 5;
R ₁₄₁ , R ₁₄₂ , R ₁₄₃ , R ₁₄₄ and R ₁₄₅ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
mc is 3;
Three R ₁₄₁ are the same or different;
md is 3;
The three R ₁₄₂ are the same or different.

In the compound represented by the general formula (1X), it is preferable that ma in the general formula (102X) is 1 or 2, and mb is 1 or 2.

In the compound represented by the general formula (1X), it is preferable that ma in the general formula (102X) is 1 and mb is 1.

In the compound represented by the general formula (1X), it is also preferable that the group represented by the general formula (11X) is a group represented by the following general formula (11AX) or a group represented by the following general formula (11BX).

(In the general formula (11AX) and the general formula (11BX),
R ₁₂₁ to R ₁₃₁ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
When a plurality of groups represented by the general formula (11AX) are present, the plurality of groups represented by the general formula (11AX) are the same or different from each other,
When a plurality of groups represented by the general formula (11BX) are present, the plurality of groups represented by the general formula (11BX) are the same or different from each other,
L ₁₃₁ and L ₁₃₂ each independently represent
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
In the general formula (11AX) and the general formula (11BX), * indicates a bonding position with the benz[a]anthracene ring in the general formula (1X).

The compound represented by the general formula (1X) is also preferably represented by the following general formula (103X):

(In the general formula (103X),
R ₁₀₁ to R ₁₁₀ and R ₁₁₂ are respectively defined as R ₁₀₁ to R ₁₁₀ and R ₁₁₂ in the general formula (1X).
R ₁₂₁ to R ₁₃₁ , L ₁₃₁ and L ₁₃₂ are respectively the same as R ₁₂₁ to R ₁₃₁ , L ₁₃₁ and L ₁₃₂ in the general formula (11BX).

In the compound represented by the general formula (1X), L ₁₃₁ is also preferably a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms.

In the compound represented by the general formula (1X), L ₁₃₂ is also preferably a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms.

In the compound represented by the general formula (1X), it is also preferable that two or more of R ₁₀₁ to R ₁₁₂ are groups represented by the general formula (11).

In the compound represented by the general formula (1X), it is preferable that two or more of R ₁₀₁ to R ₁₁₂ are groups represented by the general formula (11X), and Ar ₁₀₁ in the general formula (11X) is a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In the compound represented by the general formula (1X),
Ar ₁₀₁ is not a substituted or unsubstituted benz[a]anthryl group,
L ₁₀₁ is not a substituted or unsubstituted benz[a]anthrylene group,
It is also preferable that the substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms as R ₁₀₁ to R ₁₁₀ that is not a group represented by general formula (11X) is not a substituted or unsubstituted benz[a]anthryl group.

In the compound represented by general formula (1X), R ₁₀₁ to R ₁₁₂ that are not the group represented by general formula (11X) are each preferably independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In the compound represented by the general formula (1X), R ₁₀₁ to R ₁₁₂ that are not the group represented by the general formula (11X) are preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, or a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms.

In the compound represented by the general formula (1X), R ₁₀₁ to R ₁₁₂ that are not the group represented by the general formula (11X) are preferably hydrogen atoms.

(Compound represented by general formula (12X))
In the organic EL element according to this embodiment, the second host material is also preferably a compound represented by the following general formula (12X).

(In the general formula (12X),
One or more pairs of adjacent two or more of R ₁₂₀₁ to R ₁₂₁₀ are
linked together to form a substituted or unsubstituted monocyclic ring, or linked together to form a substituted or unsubstituted fused ring,
R ₁₂₀₁ to R ₁₂₁₀ which do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted condensed ring each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, or a group represented by the general formula (121),
provided that when the substituted or unsubstituted monocycle has a substituent, the substituent when the substituted or unsubstituted fused ring has a substituent, and at least one of R ₁₂₀₁ to R ₁₂₁₀ is a group represented by general formula (121),
When a plurality of groups represented by the general formula (121) are present, the plurality of groups represented by the general formula (121) are the same or different from each other,
_L1201 is,
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
Ar ₁₂₀₁ is
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
mx2 is 0, 1, 2, 3, 4 or 5;
When two or more L ₁₂₀₁ are present, the two or more L ₁₂₀₁ are the same or different,
When two or more Ar ₁₂₀₁ are present, the two or more Ar ₁₂₀₁ are the same or different from each other,
In the general formula (121), * indicates the bonding position to the ring represented by the general formula (12X).

In the general formula (12X), the pairs of adjacent two of R ₁₂₀₁ to R ₁₂₁₀ are the pair of R ₁₂₀₁ and R ₁₂₀₂ , the pair of R ₁₂₀₂ and R ₁₂₀₃ , the pair of R ₁₂₀₃ and R ₁₂₀₄ , the pair of R ₁₂₀₄ and R ₁₂₀₅ , the pair of R ₁₂₀₅ and R ₁₂₀₆ , the pair of R ₁₂₀₇ and R ₁₂₀₈ , the pair of R ₁₂₀₈ and R ₁₂₀₉ , and the pair of R ₁₂₀₉ and R ₁₂₁₀ .

(Compound represented by general formula (13X))
In the organic EL element according to this embodiment, the second host material is also preferably a compound represented by the following general formula (13X).

(In the general formula (13X),
R ₁₃₀₁ to R ₁₃₁₀ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, or a group represented by the general formula (131),
However, at least one of R ₁₃₀₁ to R ₁₃₁₀ is a group represented by the general formula (131).
When a plurality of groups represented by the general formula (131) are present, the plurality of groups represented by the general formula (131) are the same or different from each other,
_L1301 is,
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
Ar ₁₃₀₁ is
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
mx3 is 0, 1, 2, 3, 4 or 5;
When two or more L ₁₃₀₁ are present, the two or more L ₁₃₀₁ are the same or different,
When two or more Ar ₁₃₀₁ are present, the two or more Ar ₁₃₀₁ are the same or different from each other,
In the general formula (131), * indicates the bonding position with the fluoranthene ring in the general formula (13X).

In the organic EL element according to this embodiment, any pair of adjacent two or more of R ₁₃₀₁ to R ₁₃₁₀ that are not the group represented by the general formula (131) are not bonded to each other. The pairs of adjacent two in the general formula (13X) are the pair of R ₁₃₀₁ and R ₁₃₀₂ , the pair of R ₁₃₀₂ and R ₁₃₀₃ , the pair of R ₁₃₀₃ and R ₁₃₀₄ , the pair of R ₁₃₀₄ and R ₁₃₀₅ , the pair of R ₁₃₀₅ and R ₁₃₀₆ , the pair of R ₁₃₀₇ and R ₁₃₀₈ , the pair of R ₁₃₀₈ and R ₁₃₀₉ , and the pair of R ₁₃₀₉ and R ₁₃₁₀ .

(Compound represented by general formula (14X))
In the organic EL element according to this embodiment, the second host material is also preferably a compound represented by the following general formula (14X).

(In the general formula (14X),
R ₁₄₀₁ to R ₁₄₁₀ each independently represent
Hydrogen atom,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, or a group represented by the general formula (141),
However, at least one of R ₁₄₀₁ to R ₁₄₁₀ is a group represented by the general formula (141).
When a plurality of groups represented by the general formula (141) are present, the plurality of groups represented by the general formula (141) are the same or different from each other,
_L1401 is,
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
Ar ₁₄₀₁ is
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
mx4 is 0, 1, 2, 3, 4 or 5;
When two or more L ₁₄₀₁ are present, the two or more L ₁₄₀₁ are the same or different,
When two or more Ar ₁₄₀₁ are present, the two or more Ar ₁₄₀₁ are the same or different from each other,
In the general formula (141), * indicates the bonding position to the ring represented by the general formula (14X).

(Compound represented by general formula (15X))
In the organic EL element according to this embodiment, the second host material is also preferably a compound represented by the following general formula (15X).

(In the general formula (15X),
R ₁₅₀₁ to R ₁₅₁₄ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, or a group represented by the general formula (151),
However, at least one of R ₁₅₀₁ to R ₁₅₁₄ is a group represented by the general formula (151).
When a plurality of groups represented by the general formula (151) are present, the plurality of groups represented by the general formula (151) are the same or different from each other,
_L1501 is,
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
Ar ₁₅₀₁ is
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
mx5 is 0, 1, 2, 3, 4 or 5;
When two or more L ₁₅₀₁ are present, the two or more L ₁₅₀₁ are the same or different from each other,
When two or more Ar ₁₅₀₁ are present, the two or more Ar ₁₅₀₁ are the same or different from each other,
In the general formula (151), * indicates the bonding position to the ring represented by the general formula (15X).

(Compound represented by general formula (16X))
In the organic EL element according to this embodiment, the second host material is also preferably a compound represented by the following general formula (16X).

(In the general formula (16X),
R ₁₆₀₁ to R ₁₆₁₄ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by —C(═O)R ₈₀₁ ,
A group represented by —COOR ₈₀₂ ,
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, or a group represented by the general formula (161),
However, at least one of R ₁₆₀₁ to R ₁₆₁₄ is a group represented by the general formula (161).
When a plurality of groups represented by the general formula (161) are present, the plurality of groups represented by the general formula (161) are the same or different from each other,
_L1601 is,
Single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
Ar ₁₆₀₁ is
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
mx6 is 0, 1, 2, 3, 4 or 5;
When two or more L ₁₆₀₁ are present, the two or more L ₁₆₀₁ are the same or different,
When two or more Ar ₁₆₀₁ are present, the two or more Ar ₁₆₀₁ are the same or different from each other,
In the general formula (161), * indicates the bonding position to the ring represented by the general formula (16X).

In the organic EL element according to this embodiment, it is also preferable that the second host material has a linking structure including a benzene ring and a naphthalene ring linked by a single bond in the molecule, and that the benzene ring and the naphthalene ring in the linking structure are each independently further fused with a single ring or a fused ring or are not fused with a single ring or a fused ring, and that the benzene ring and the naphthalene ring in the linking structure are further linked by a crosslink in at least one portion other than the single bond.
When the second host material has a linking structure including such a cross-link, it is expected that deterioration of the chromaticity of the organic EL element can be suppressed.
In this case, the second host material has, as a minimum unit, a linked structure containing a benzene ring and a naphthalene ring linked by a single bond as represented by the following formula (X1) or (X2) in the molecule, and a monocyclic or fused ring may be further fused to the benzene ring, or a monocyclic or fused ring may be further fused to the naphthalene ring. For example, even when the second host material has a linked structure containing a naphthalene ring and a naphthalene ring linked by a single bond as represented by the following formula (X3), (X4), or (X5) in the molecule (sometimes referred to as a naphthalene-naphthalene linked structure), one of the naphthalene rings contains a benzene ring, and therefore contains a benzene-naphthalene linked structure.

In the organic EL element according to this embodiment, it is also preferable that the bridge contains a double bond. In other words, it is also preferable that the benzene ring and the naphthalene ring have a structure in which they are further connected by a bridge structure containing a double bond in a portion other than the single bond.

When the benzene ring and the naphthalene ring in the benzene-naphthalene linked structure are further linked by a crosslink at at least one portion other than a single bond, for example, in the case of the formula (X1), the linked structure (fused ring) is represented by the following formula (X11), and in the case of the formula (X3), the linked structure (fused ring) is represented by the following formula (X31).
When the benzene ring and the naphthalene ring in the benzene-naphthalene linked structure are further linked by a bridge containing a double bond in a portion other than the single bond, for example, in the case of the formula (X1), the linked structure (fused ring) is represented by the following formula (X12); in the case of the formula (X2), the linked structure (fused ring) is represented by the following formula (X21) or formula (X22); in the case of the formula (X4), the linked structure (fused ring) is represented by the following formula (X41); and in the case of the formula (X5), the linked structure (fused ring) is represented by the following formula (X51).
When the benzene ring and the naphthalene ring in the benzene-naphthalene linked structure are further linked by a bridge containing a heteroatom (e.g., an oxygen atom) in at least one portion other than a single bond, for example, in the case of the above formula (X1), the linked structure (fused ring) is represented by the following formula (X13).

In the organic EL element according to this embodiment, the second host material preferably has a biphenyl structure in which a first benzene ring and a second benzene ring are linked by a single bond in the molecule, and the first benzene ring and the second benzene ring in the biphenyl structure are further linked by a bridge at at least one portion other than the single bond.

In the organic EL element according to this embodiment, it is also preferable that the first benzene ring and the second benzene ring in the biphenyl structure are further linked by the bridge at one part other than the single bond. By having the second host material have a biphenyl structure including such a bridge, it is expected that the deterioration of the chromaticity of the organic EL element can be suppressed.

In the organic EL element according to this embodiment, it is also preferable that the crosslink contains a double bond.
In the organic EL element according to this embodiment, it is also preferable that the crosslink does not contain a double bond.

It is also preferred that the first benzene ring and the second benzene ring in the biphenyl structure are further linked by the bridge at two portions other than the single bond.

In the organic EL element according to this embodiment, it is also preferable that the first benzene ring and the second benzene ring in the biphenyl structure are further connected by the bridge at two parts other than the single bond, and the bridge does not contain a double bond. By having the second host material have a biphenyl structure including such a bridge, it is expected that the deterioration of the chromaticity of the organic EL element can be suppressed.

For example, when the first benzene ring and the second benzene ring in the biphenyl structure represented by the following formula (BP1) are further linked by a bridge at at least one portion other than a single bond, the biphenyl structure becomes a linked structure (condensed ring) such as those represented by the following formulas (BP11) to (BP15).

The formula (BP11) is a structure in which the units are linked by a bridge that does not contain a double bond in one part other than the single bond.
The formula (BP12) is a structure in which the units are linked by a bridge containing a double bond in one part other than the single bond.
The formula (BP13) is a structure in which the two moieties other than the single bond are linked by a bridge that does not contain a double bond.
The formula (BP14) has a structure in which one of the two moieties other than the single bond is linked by a bridge not containing a double bond, and the other of the two moieties other than the single bond is linked by a bridge containing a double bond.
The formula (BP15) has a structure in which the two moieties other than the single bond are linked by a bridge containing a double bond.

In the first host material and the second host material, it is preferable that all of the groups described as "substituted or unsubstituted" are "unsubstituted" groups.

(Method for producing compounds represented by general formulas (1), (1X), (12X), (13X), (14X), (15X) and (16X))
The compounds represented by the general formulae (1), (1X), (12X), (13X), (14X), (15X) and (16X) can be produced by known methods. The compounds represented by the general formulae (1), (1X), (12X), (13X), (14X), (15X) and (16X) can also be produced by following known methods and using known alternative reactions and raw materials suited to the target product.

(Specific examples of compounds represented by formulas (1), (1X), (12X), (13X), (14X), (15X) and (16X))
Specific examples of the compounds represented by the general formulae (1), (1X), (12X), (13X), (14X), (15X) and (16X) include the following compounds, however, the present invention is not limited to these specific examples of the compounds represented by the general formulae (1), (1X), (12X), (13X), (14X), (15X) and (16X).
In the present specification, in specific examples of compounds, D represents a deuterium atom, Me represents a methyl group, and tBu represents a tert-butyl group.

(First luminescent compound, second luminescent compound, and third luminescent compound)
As the first luminescent compound and the second luminescent compound, for example, one or more compounds selected from the group consisting of compounds represented by the following general formulas (31-1) and (31-3), compounds represented by the following general formulas (31-2) and (31-3), compounds represented by the following general formula (41), and compounds represented by the following general formula (50) can be suitably used.
The third light-emitting compound is not particularly limited, but may be, for example, one or more compounds selected from the group consisting of compounds represented by the following general formulas (31-1) and (31-3), compounds represented by the following general formulas (31-2) and (31-3), compounds represented by the following general formula (41), and compounds represented by the following general formula (50).

(Compounds represented by general formulae (31-1) and (31-3), or compounds represented by general formulae (31-2) and (31-3))
The compounds represented by the general formulae (31-1) and (31-3) or the compounds represented by the general formulae (31-2) and (31-3) will be described.
It is also preferable that the first luminescent compound and the second luminescent compound are compounds represented by the following general formulas (31-1) and (31-3), or compounds represented by the following general formulas (31-2) and (31-3).

(In the general formula (31-1), the general formula (31-2) and the general formula (31-3),
Ring A is
a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic ring having 5 to 50 ring atoms,
In the general formula (31-1), two * are each independently bonded to a ring-forming carbon atom of an aromatic hydrocarbon ring or a ring-forming atom of a heterocycle as ring A in the general formula (31-3),
The three * in the general formula (31-2) each independently bond to a ring-forming carbon atom of the aromatic hydrocarbon ring or a ring-forming atom of the heterocycle as the ring A in the general formula (31-3),
One or more pairs of adjacent two or more of R ₁ to R ₁₆ are
joined together to form a substituted or unsubstituted monocyclic ring, or
are bonded together to form a substituted or unsubstituted fused ring, or are not bonded together,
R ₁ to R ₁₆ which do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted fused ring each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkylthio group having 1 to 50 carbon atoms,
a substituted or unsubstituted aryloxy group having 6 to 50 ring carbon atoms,
a substituted or unsubstituted arylthio group having 6 to 50 ring carbon atoms,
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by -Si( _R31 )( _R32 )( _R33 ),
A group represented by —C(═O)R ₃₄ ,
A group represented by —COOR ₃₅ ,
A group represented by —N(R ₃₆ )(R ₃₇ ),
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.
(In the general formula (31-1), the general formula (31-2) and the general formula (31-3),
R ₃₁ to R ₃₇ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
When a plurality of R ₃₁ are present, the plurality of R ₃₁ are the same or different from each other,
When a plurality of R ₃₂ are present, the plurality of R ₃₂ are the same or different,
When a plurality of R _33s are present, the plurality of R _33s are the same or different from each other,
When a plurality of R _34s are present, the plurality of R _34s are the same or different from each other,
When a plurality of R _35s are present, the plurality of R _35s are the same or different from each other,
When a plurality of R _36s are present, the plurality of R _36s are the same or different from each other,
When a plurality of R _37s are present, the plurality of R _37s are the same or different.

It is also preferable that ring A in the general formula (31-3) is a benzene ring represented by the following general formula (32).

(In the general formula (32), of the two * ring-forming carbon atoms, one * is bonded to a bond extending from the ring B in the general formula (31-1) or the general formula (31-2), and the other * is bonded to a bond extending from the ring C in the general formula (31-3),
R ₁₇ has the same meaning as R ₁ to R ₁₆ , which does not form a substituted or unsubstituted monocycle and does not form a substituted or unsubstituted condensed ring;
n is 1 or 2, and when n is 2, the two R ₁₇ are the same or different from each other.

It is preferable that the compounds represented by the general formulae (31-1) and (31-3) or the compounds represented by the general formulae (31-2) and (31-3) are compounds represented by the following general formula (33), general formula (34) or formula (35).

(In the general formula (33), the general formula (34) and the general formula (35),
Ring A3 is a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 50 ring carbon atoms or a substituted or unsubstituted heterocycle having 5 to 50 ring atoms,
R ₁ to R ₇ and R ₁₀ to R ₁₇ each independently have the same definition as R ₁ to R ₁₆ in the general formula (31-1), the general formula (31-2), and the general formula (31-3). Two R _17s are the same or different from each other.

It is also preferable that the substituted or unsubstituted aromatic hydrocarbon ring having 6 to 50 ring carbon atoms as ring A in general formula (31-3) and ring A3 in general formula (35) are each independently a substituted or unsubstituted fused aryl ring having 10 to 50 ring carbon atoms.
It is also preferable that the substituted or unsubstituted aromatic hydrocarbon ring having 6 to 50 ring carbon atoms as ring A in the general formula (31-3) and ring A3 in the general formula (35) are each independently a substituted or unsubstituted naphthalene ring, a substituted or unsubstituted anthracene ring, or a substituted or unsubstituted fluorene ring.
It is more preferable that the substituted or unsubstituted aromatic hydrocarbon ring having 6 to 50 ring carbon atoms as ring A in the general formula (31-3) and ring A3 in the general formula (35) are each independently a substituted or unsubstituted naphthalene ring, or a substituted or unsubstituted fluorene ring.
It is also preferable that the substituted or unsubstituted heterocycles having 5 to 50 ring atoms as ring A in the general formula (31-3) and ring A3 in the general formula (35) are each independently a substituted or unsubstituted fused heterocycle having 8 to 50 ring atoms.
It is also preferable that the substituted or unsubstituted heterocycles having 5 to 50 ring atoms as ring A in the general formula (31-3) and ring A3 in the general formula (35) are each independently a substituted or unsubstituted dibenzofuran ring, a substituted or unsubstituted carbazole ring, or a substituted or unsubstituted dibenzothiophene ring.

It is preferable that the compounds represented by the general formulae (31-1) and (31-3) or the compounds represented by the general formulae (31-2) and (31-3) are selected from the group consisting of compounds represented by the following general formulae (36-1) to (36-6).

(In the general formulae (36-1) to (36-6),
R ₁ to R ₇ and R ₁₀ to R ₁₇ each independently have the same definition as R ₁ to R ₁₆ in the general formula (31-1), the general formula (31-2), and the general formula (31-3), and two R _17s are the same or different from each other;
X is O, NR ₂₅ , or C(R ₂₆ )(R ₂₇ );
One or more pairs of adjacent two or more of R ₂₁ to R ₂₇ are
joined together to form a substituted or unsubstituted monocyclic ring, or
are bonded together to form a substituted or unsubstituted fused ring, or are not bonded together,
R ₂₁ to R ₂₇ which do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted fused ring are each independently synonymous with R 1 to R 16 which do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted fused ring in general formula ( _31-1 ), general formula (31-2), and general formula ( _31-3 ).

In the compounds represented by the general formulae (31-1) and (31-3), or the compounds represented by the general formulae (31-2) and (31-3), it is preferred that R ₁ to R ₁₇ are each independently selected from the group consisting of a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, and a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In the compounds represented by the general formulae (31-1) and (31-3), or the compounds represented by the general formulae (31-2) and (31-3), it is preferred that R ₁ to R ₁₇ are each independently selected from the group consisting of a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 18 ring carbon atoms, and a substituted or unsubstituted heterocyclic group having 5 to 18 ring atoms.

It is preferable that the compounds represented by the general formulas (31-1) and (31-3) or the compounds represented by the general formulas (31-2) and (31-3) are compounds represented by the following general formula (33-2).

(In the general formula (33-2), R ₃ , R ₅ , R ₆ , R ₁₀ , R ₁₂ and R ₁₃ each independently have the same meaning as R ₁ to R ₁₆ in the general formulae (31-1), (31-2) and (31-3).)

In the compounds represented by the general formulae (31-1) and (31-3), or the compounds represented by the general formulae (31-2) and (31-3), the substituent in the case of "substituted or unsubstituted" is
an alkyl group having 1 to 50 carbon atoms,
a haloalkyl group having 1 to 50 carbon atoms,
an alkenyl group having 2 to 50 carbon atoms,
an alkynyl group having 2 to 50 carbon atoms,
a cycloalkyl group having 3 to 50 ring carbon atoms,
an alkoxy group having 1 to 50 carbon atoms,
an alkylthio group having 1 to 50 carbon atoms,
an aryloxy group having 6 to 50 ring carbon atoms,
an arylthio group having 6 to 50 ring carbon atoms,
an aralkyl group having 7 to 50 carbon atoms,
A group represented by -Si(R ₃₄₁ )(R ₃₄₂ )(R ₃₄₃ ),
A group represented by —C(═O)R ₃₄₄ ,
A group represented by —COOR ₃₄₅ ,
a group represented by —S(═O) ₂ R ₃₄₆ ,
A group represented by -P(=O)( _R347 )( _R348 ),
A group represented by —Ge(R ₃₄₉ )(R ₃₅₀ )(R ₃₅₁ ),
A group represented by -N(R ₃₅₂ )(R ₃₅₃ ),
Hydroxy groups,
Halogen atoms,
Cyano group,
Nitro group,
It is preferably selected from the group consisting of an aryl group having 6 to 50 ring carbon atoms, and a heterocyclic group having 5 to 50 ring atoms.
Here, R ₃₄₁ to R ₃₅₃ are each independently a hydrogen atom, an alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, an aryl group having 6 to 50 ring carbon atoms, or a heterocyclic group having 5 to 50 ring atoms.
When a plurality of R ₃₄₁ are present, the plurality of R ₃₄₁ are the same or different,
When a plurality of R ₃₄₂ are present, the plurality of R ₃₄₂ are the same or different,
When a plurality of R ₃₄₃ are present, the plurality of R ₃₄₃ are the same or different,
When a plurality of R _344s are present, the plurality of R _344s are the same or different from each other,
When a plurality of R ₃₄₅ are present, the plurality of R ₃₄₅ are the same or different from each other,
When a plurality of R ₃₄₆ are present, the plurality of R ₃₄₆ are the same or different,
When a plurality of R _347s are present, the plurality of R _347s are the same or different from each other,
When a plurality of R ₃₄₈ are present, the plurality of R ₃₄₈ are the same or different,
When a plurality of R _349s are present, the plurality of R _349s are the same or different from each other,
When a plurality of R ₃₅₀ are present, the plurality of R ₃₅₀ are the same or different from each other,
When a plurality of R ₃₅₁ are present, the plurality of R ₃₅₁ are the same or different,
When a plurality of R ₃₅₂ are present, the plurality of R ₃₅₂ are the same or different,
When a plurality of R ₃₅₃ are present, the plurality of R ₃₅₃ are the same or different.

In the compounds represented by the general formulae (31-1) and (31-3) or the compounds represented by the general formulae (31-2) and (31-3), the substituent in the case of "substituted or unsubstituted" is preferably an alkyl group having 1 to 50 carbon atoms, an aryl group having 6 to 50 ring carbon atoms, or a heterocyclic group having 5 to 50 ring atoms.

In the compounds represented by the general formulae (31-1) and (31-3) or the compounds represented by the general formulae (31-2) and (31-3), the substituent in the case of "substituted or unsubstituted" is preferably an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 18 ring carbon atoms, or a heterocyclic group having 5 to 18 ring atoms.

It is also preferable that the compounds represented by the general formulas (31-1) and (31-3) or the compounds represented by the general formulas (31-2) and (31-3) are compounds represented by the following general formula (31-11).

(In the general formula (33-11),
One or more pairs of adjacent two or more of R ₁ to R ₇ and R ₁₀ to R ₁₆ are
joined together to form a substituted or unsubstituted monocyclic ring, or
are bonded together to form a substituted or unsubstituted fused ring, or are not bonded together,
R ₁ to R ₇ , R ₁₀ to R ₁₆ and R ₁₇ which do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted fused ring each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkylthio group having 1 to 50 carbon atoms,
a substituted or unsubstituted aryloxy group having 6 to 50 ring carbon atoms,
a substituted or unsubstituted arylthio group having 6 to 50 ring carbon atoms,
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by -Si( _R31 )( _R32 )( _R33 ),
A group represented by —C(═O)R ₃₄ ,
A group represented by —COOR ₃₅ ,
A group represented by —N(R ₃₆ )(R ₃₇ ),
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
However, at least one of R ₁ to R ₇ and R ₁₀ to R ₁₆ is a group represented by -N(R ₃₆ )(R ₃₇ );
Two R ₁₇ 's are the same or different;
R ₃₁ to R ₃₇ each independently have the same definition as R ₃₁ to R ₃₇ in the general formulae (31-1), (31-2) and (31-3).

It is also preferable that any two of R ₁ to R ₇ and R ₁₀ to R ₁₆ in the general formula (31-11) are groups represented by -N(R ₃₆ )(R ₃₇ ).

It is also preferable that the compound represented by the general formula (31-11) is a compound represented by the following general formula (33-13):

(In the general formula (33-13),
One or more pairs of adjacent two or more of R ₁ to R ₄ and R ₁₀ to R ₁₃ are
joined together to form a substituted or unsubstituted monocyclic ring, or
are bonded together to form a substituted or unsubstituted fused ring, or are not bonded together,
R ₁ to R ₄ , R ₁₀ to R ₁₃ , and R ₁₇ which do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted fused ring each independently represent
Hydrogen atoms,
a substituted or unsubstituted aryl group having 6 to 18 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 18 ring atoms,
Two R ₁₇ 's are the same or different;
R _A , R _B , R _C and R _D each independently represent
a substituted or unsubstituted aryl group having 6 to 18 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 18 ring atoms.

It is also preferable that the compound represented by the general formula (31-13) is a compound represented by the following general formula (33-14):

(In the general formula (33-14), R ₁₇ , R _A , R _B , R _C and R _D each independently have the same meaning as R ₁₇ , R _A , R _B , R _C and R _D in the general formula (33-13), and two R _17s are the same or different.)

In the general formula (33-13) and the general formula (33-14), it is preferable that R _A , R _B , R _C and R _D each independently represent a substituted or unsubstituted aryl group having 6 to 18 ring carbon atoms.

In the general formula (33-13) and the general formula (33-14), it is preferable that R _A , R _B , R _C and R _D each independently represent a substituted or unsubstituted phenyl group.

In the compounds represented by the general formulae (31-1) and (31-3) or the compounds represented by the general formulae (31-2) and (31-3), R ₁₇ is preferably a hydrogen atom.

In the compounds represented by the general formulae (31-11), (33-13) and (33-14), the substituent in the case of "substituted or unsubstituted" is preferably selected from the group consisting of an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 18 ring carbon atoms and a heterocyclic group having 5 to 18 ring atoms.

In the compounds represented by the general formulas (31-11), (33-13) and (33-14), the substituent in the case of "substituted or unsubstituted" is preferably an alkyl group having 1 to 5 carbon atoms.

(Specific examples of compounds represented by general formulae (31-1) and (31-3) or compounds represented by general formulae (31-2) and (31-3))
Specific examples of the compounds represented by the general formulae (31-1) and (31-3) or the compounds represented by the general formulae (31-2) and (31-3) include the compounds shown below.

(Compound represented by general formula (41))
The compound represented by formula (41) will be described.
It is also preferable that the first luminescent compound and the second luminescent compound are compounds represented by the following general formula (41).

(In the general formula (41),
Ring a, ring b and ring c each independently represent
a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 50 ring carbon atoms, or
a substituted or unsubstituted heterocyclic ring having 5 to 50 ring atoms,
R ₄₀₁ and R ₄₀₂ each independently bond to the ring a, ring b or ring c to form a substituted or unsubstituted heterocycle or do not form a substituted or unsubstituted heterocycle;
R ₄₀₁ and R ₄₀₂ which do not form a substituted or unsubstituted heterocycle each independently represent
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

Ring a, ring b, and ring c are rings that are fused to the central fused two-ring structure of general formula (41) composed of a B atom and two N atoms.

The "aromatic hydrocarbon ring" as the ring a, ring b and ring c has the same structure as the compound in which a hydrogen atom has been introduced into the above-mentioned "aryl group".
The "aromatic hydrocarbon ring" as ring a is a ring containing the three carbon atoms on the central fused bicyclic structure of the above general formula (41) as ring-forming atoms.
The "aromatic hydrocarbon ring" as ring b and ring c is a ring containing the two carbon atoms on the central fused two-ring structure of formula (41) as ring-forming atoms.
Specific examples of the "substituted or unsubstituted aromatic hydrocarbon ring having 6 to 50 ring carbon atoms" include compounds in which a hydrogen atom has been introduced into the "aryl group" described in specific example group G1.

The "heterocycle" as ring a, ring b and ring c has the same structure as the compound in which a hydrogen atom is introduced into the above-mentioned "heterocyclic group".
The "heterocycle" as ring a is a ring containing the three carbon atoms on the central fused two-ring structure of the general formula (41) as ring-forming atoms.
The "heterocycle" as ring b and ring c is a ring containing the two carbon atoms on the central fused two-ring structure of formula (41) as ring-forming atoms.
Specific examples of the "substituted or unsubstituted heterocyclic ring having 5 to 50 ring atoms" include compounds in which a hydrogen atom has been introduced into the "heterocyclic group" described in specific example group G2.

R ₄₀₁ and R ₄₀₂ may each independently bond to a ring, b ring, or c ring to form a substituted or unsubstituted heterocycle. In this case, the heterocycle contains a nitrogen atom on the central fused two-ring structure of the general formula (41). In this case, the heterocycle may contain a heteroatom other than a nitrogen atom. Specifically, R ₄₀₁ and R ₄₀₂ bond to a ring, b ring, or c ring means that an atom constituting a ring, b ring, or c ring is bonded to an atom constituting R ₄₀₁ and R _402. For example, R ₄₀₁ may bond to a ring to form a two-ring fused (or three-ring or more fused) nitrogen-containing heterocycle in which the ring containing R ₄₀₁ is fused to the ring a. Specific examples of the nitrogen-containing heterocycle include compounds corresponding to the nitrogen-containing two-ring fused or more heterocyclic groups in the specific example group G2.
The above also applies when R ₄₀₁ is bonded to ring b, when R ₄₀₂ is bonded to ring a, and when R ₄₀₂ is bonded to ring c.

In one embodiment, the ring a, the ring b, and the ring c in the general formula (41) are each independently a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 50 ring carbon atoms.
In one embodiment, the ring a, the ring b, and the ring c in the general formula (41) are each independently a substituted or unsubstituted benzene ring or a substituted or unsubstituted naphthalene ring.

In one embodiment, R ₄₀₁ and R ₄₀₂ in the general formula (41) are each independently a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In one embodiment, the compound represented by the general formula (41) is a compound represented by the following general formula (42):

(In the general formula (42),
R _401A is bonded to one or more selected from the group consisting of R ₄₁₁ and R ₄₂₁ to form a substituted or unsubstituted heterocycle, or does not form a substituted or unsubstituted heterocycle;
R _402A is bonded to one or more selected from the group consisting of R ₄₁₃ and R ₄₁₄ to form a substituted or unsubstituted heterocycle, or does not form a substituted or unsubstituted heterocycle;
R _401A and R _402A which do not form a substituted or unsubstituted heterocycle each independently represent
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
One or more pairs of adjacent two or more of R ₄₁₁ to R ₄₂₁ are
joined together to form a substituted or unsubstituted monocyclic ring, or
are bonded together to form a substituted or unsubstituted fused ring, or are not bonded together,
R ₄₁₁ to R ₄₂₁ which do not form a substituted or unsubstituted heterocycle, do not form a substituted or unsubstituted monocycle, and do not form a substituted or unsubstituted fused ring each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a group represented by -N(R ₉₀₆ )(R ₉₀₇ );
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted monovalent heterocyclic group having 5 to 50 ring atoms,
R ₉₀₁ to R ₉₀₇ each independently have the same meaning as R ₉₀₁ to R ₉₀₇ in the compound represented by formula (2).

R _401A and R _402A in the general formula (42) are groups corresponding to R ₄₀₁ and R ₄₀₂ in the general formula (41).
For example, R _401A and R ₄₁₁ may be bonded to form a 2-ring (or 3-ring or more) nitrogen-containing heterocycle in which a ring containing them is fused with a benzene ring corresponding to the ring a. Specific examples of the nitrogen-containing heterocycle include compounds corresponding to the nitrogen-containing 2-ring or more fused heterocyclic group in the specific example group G2. The same applies when R _401A and R ₄₁₂ are bonded, when R _402A and R ₄₁₃ are bonded, and when R _402A and R ₄₁₄ are bonded.

One or more pairs of adjacent two or more of R ₄₁₁ to R ₄₂₁ are
They may be bonded to each other to form a substituted or unsubstituted monocyclic ring, or may be bonded to each other to form a substituted or unsubstituted fused ring.
For example, R ₄₁₁ and R _{412 may} be bonded to form a structure in which a benzene ring, _an indole ring, a pyrrole ring, a benzofuran ring, a benzothiophene ring, or the like is condensed with the 6-membered ring to which R 411 and R 412 are bonded, and the condensed ring thus formed is a naphthalene ring, a carbazole ring, an indole ring, a dibenzofuran ring, or a dibenzothiophene ring.

In one embodiment, R ₄₁₁ to R ₄₂₁ that do not contribute to ring formation are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In one embodiment, R ₄₁₁ to R ₄₂₁ that do not contribute to ring formation are each independently a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In one embodiment, R ₄₁₁ to R ₄₂₁ that do not contribute to ring formation are each independently a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms.

In one embodiment, R ₄₁₁ to R ₄₂₁ that do not contribute to ring formation are each independently a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, and at least one of R ₄₁₁ to R ₄₂₁ is a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms.

In one embodiment, the compound represented by the general formula (42) is a compound represented by the following general formula (43):

(In the general formula (43),
R ₄₃₁ is bonded to R ₄₄₆ to form a substituted or unsubstituted heterocycle, or does not form a substituted or unsubstituted heterocycle;
R ₄₃₃ combines with R ₄₄₇ to form a substituted or unsubstituted heterocycle, or does not form a substituted or unsubstituted heterocycle;
R ₄₃₄ is bonded to R ₄₅₁ to form a substituted or unsubstituted heterocycle or does not form a substituted or unsubstituted heterocycle;
R ₄₄₁ is bonded to R ₄₄₂ to form a substituted or unsubstituted heterocycle, or does not form a substituted or unsubstituted heterocycle;
One or more pairs of adjacent two or more of R ₄₃₁ to R ₄₅₁ are
joined together to form a substituted or unsubstituted monocyclic ring, or
are bonded together to form a substituted or unsubstituted fused ring, or are not bonded together,
R ₄₃₁ to R ₄₅₁ which do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted fused ring each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by —O—(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
a group represented by -N(R ₉₀₆ )(R ₉₀₇ );
Halogen atoms,
Cyano group,
Nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
R ₉₀₁ to R ₉₀₇ each independently have the same meaning as R ₉₀₁ to R ₉₀₇ in the compound represented by formula (2).

R ₄₃₁ may be bonded to R ₄₄₆ to form a substituted or unsubstituted heterocycle. For example, R ₄₃₁ and R ₄₄₆ may be bonded to form a nitrogen-containing heterocycle having three or more condensed rings in which the benzene ring to which R ₄₄₆ is bonded, the ring containing N, and the benzene ring corresponding to the ring a are condensed. Specific examples of the nitrogen-containing heterocycle include compounds corresponding to the nitrogen-containing heterocyclic group having three or more condensed rings in the specific example group G2. The same applies when R ₄₃₃ and R ₄₄₇ are bonded, when R ₄₃₄ and R ₄₅₁ are bonded, and when R ₄₄₁ and R ₄₄₂ are bonded.

In one embodiment, R ₄₃₁ to R ₄₅₁ that do not contribute to ring formation are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In one embodiment, R ₄₃₁ to R ₄₅₁ that do not contribute to ring formation are each independently a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In one embodiment, R ₄₃₁ to R ₄₅₁ that do not contribute to ring formation are each independently a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms.

In one embodiment, R ₄₃₁ to R ₄₅₁ that do not contribute to ring formation are each independently a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, and at least one of R ₄₃₁ to R ₄₅₁ is a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms.

In one embodiment, the compound represented by the general formula (43) is a compound represented by the following general formula (43A):

(In the general formula (43A),
_R461 is
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, or a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
R ₄₆₂ to R ₄₆₅ each independently represent
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, or a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In one embodiment, R ₄₆₁ to R ₄₆₅ are each independently a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In one embodiment, R ₄₆₁ to R ₄₆₅ each independently represent a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms.

In one embodiment, the compound represented by the general formula (43) is a compound represented by the following general formula (43B):

(In the general formula (43B),
R ₄₇₁ and R ₄₇₂ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a group represented by -N(R ₉₀₆ )(R ₉₀₇ ), or a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
R ₄₇₃ to R ₄₇₅ each independently represent
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a group represented by -N(R ₉₀₆ )(R ₉₀₇ ), or a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
R ₉₀₆ and R ₉₀₇ each independently have the same meaning as R ₉₀₆ and R ₉₀₇ in the compound represented by formula (2).

In one embodiment, the compound represented by the general formula (43) is a compound represented by the following general formula (43B'):

(In the general formula (43B'), R ₄₇₂ to R ₄₇₅ each independently have the same definition as R ₄₇₂ to R ₄₇₅ in the compound represented by the general formula (43B).)

In one embodiment, at least one of R ₄₇₁ to R ₄₇₅ is
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -N(R ₉₀₆ )(R ₉₀₇ ), or a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In one embodiment,
_R472 is
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a group represented by -N(R ₉₀₆ )(R ₉₀₇ ), or a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
R ₄₇₁ and R ₄₇₃ to R ₄₇₅ each independently represent
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
A group represented by -N(R ₉₀₆ )(R ₉₀₇ ), or a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In one embodiment, the compound represented by the general formula (43) is a compound represented by the following general formula (43C):

(In the general formula (43C),
R ₄₈₁ and R ₄₈₂ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, or a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
R ₄₈₃ to R ₄₈₆ each independently represent
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, or a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In one embodiment, the compound represented by the general formula (43) is a compound represented by the following general formula (43C'):

(In the above general formula (43C'), R ₄₈₃ to R ₄₈₆ each independently have the same definition as R ₄₈₃ to R ₄₈₆ in the compound represented by the above general formula (43C).)

In one embodiment, R ₄₈₁ to R ₄₈₆ are each independently a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In one embodiment, R ₄₈₁ to R ₄₈₆ each independently represent a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

The compound represented by the general formula (41) can be produced by first linking the ring a, ring b, and ring c with linking groups (a group containing N-R ₄₀₁ and a group containing N-R ₄₀₂ ) to produce an intermediate (first reaction), and then linking the ring a, ring b, and ring c with a linking group (a group containing B) to produce a final product (second reaction). In the first reaction, an amination reaction such as the Bachbrut-Hartwig reaction can be applied. In the second reaction, a tandem hetero Friedel-Crafts reaction or the like can be applied.

(Specific examples of compounds represented by formula (41))
Specific examples of the compound represented by the general formula (41) include the compounds shown below.

(Compound represented by general formula (50))
The compound represented by formula (50) will be described.
It is also preferable that the first luminescent compound and the second luminescent compound are compounds represented by the following general formula (50).

(In the general formula (50),
ring Ax, ring Dx and ring Ex each independently represent
a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 50 ring carbon atoms, or
a substituted or unsubstituted heterocyclic ring having 5 to 50 ring atoms,
_X5 is _CR55 or a nitrogen atom;
The dashed line extending from _X5 is a single bond bonding to _Z1 or a single bond bonding to _Z2 ;
_Z1 is
When it is bonded to _X5 via the single bond shown by the dashed line, it is a carbon atom;
When _X5 is not bonded to the single bond represented by the dashed line, it is CR _X9 or a nitrogen atom;
_Z2 is
When it is bonded to _X5 via the single bond shown by the dashed line, it is a carbon atom;
When _X5 is not bonded to the single bond represented by the dashed line, it is CR _X8 or a nitrogen atom;
The pair consisting of R ₅₄ and R ₅₅ is
joined together to form a substituted or unsubstituted monocyclic ring, or
are bonded together to form a substituted or unsubstituted fused ring, or are not bonded together,
R ₅₄ and R ₅₅ which do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted fused ring each independently represent
Hydrogen atoms,
Halogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted fluoroalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si( _R501 )( _R502 )( _R503 ),
A group represented by —O—(R ₅₀₄ ),
A group represented by -S-(R ₅₀₅ ),
a group represented by -N(R ₅₀₆ )(R ₅₀₇ );
A group represented by —C(═O)R ₅₀₈ ,
A group represented by —COOR ₅₀₉ ,
A group represented by -C(=O)-N( _R510 )( _R511 ),
A group represented by -P(=O)(R ₅₁₂ )(R ₅₁₃ ),
Cyano group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
Y is NR ₅₁ , an oxygen atom, a sulfur atom, or C(R ₅₂₃ )(R ₅₂₄ ), or is represented by the general formula (51);
_R51 is
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted fluoroalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, or a group represented by the general formula (52),
_R51 is
Binding to the Ax ring,
bonded to the Ex ring, or not bonded to the Ax ring and the Ex ring,
In the general formula (52), X ₅₁ is CR ₅₅₁ or a nitrogen atom;
The pair consisting of R ₅₄₁ and R ₅₅₁ in the general formula (52) is
joined together to form a substituted or unsubstituted monocyclic ring, or
are bonded together to form a substituted or unsubstituted fused ring, or are not bonded together,
R ₅₄₁ and R ₅₅₁ which do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted condensed ring are each independently defined as R ₅₄ and R ₅₅ which do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted condensed ring,
Of the two dashed lines in the general formula (52),
The dashed line extending from _X51 is a single bond bonding to _Z3 or a single bond bonding to _Z4 ;
The other dashed line indicates the bonding position of the nitrogen atom of the group represented by NR ₅₁ ,
_Z3 is
When it is bonded to X ₅₁ via the single bond shown by the dashed line, it is a carbon atom;
When X51 is not bonded to _X51 via the single bond represented by the dashed line, it is CR _X6A or a nitrogen atom;
_Z4 is
When bonded to X ₅₁ via the single bond shown by the dashed line, it is a carbon atom;
When X51 is not bonded to _X51 via the single bond shown by the dashed line, it is CR _X8A or a nitrogen atom;
The pair consisting of R ₅₂₃ and R ₅₂₄ is
joined together to form a substituted or unsubstituted monocyclic ring, or
are bonded together to form a substituted or unsubstituted fused ring, or are not bonded together,
R ₅₂₁ , R ₅₂₂ , and R ₅₂₃ and R ₅₂₄ which do not form the substituted or unsubstituted monocycle and do not form the substituted or unsubstituted fused ring each independently represent:
Hydrogen atom,
Halogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted fluoroalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si( _R501 )( _R502 )( _R503 ),
A group represented by —O—(R ₅₀₄ ),
A group represented by -S-(R ₅₀₅ ),
a group represented by -N(R ₅₀₆ )(R ₅₀₇ );
A group represented by —C(═O)R ₅₀₈ ,
A group represented by —COOR ₅₀₉ ,
A group represented by -C(=O)-N( _R510 )( _R511 ),
A group represented by -P(=O)(R ₅₁₂ )(R ₅₁₃ ),
Cyano group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
one of R ₅₂₁ and R ₅₂₂ is bonded to ring Ax or to ring Ex, or both of R ₅₂₁ and R ₅₂₂ are not bonded to ring Ax or ring Ex;
q is 0 or 1;
p and r are each independently 0, 1, 2, or 3;
A group consisting of two or more adjacent R _56s ,
A group consisting of two or more adjacent R _58s ,
A group consisting of two or more adjacent R _59s ;
A set consisting of R _X6A and R ₅₆ adjacent to R _X6A ,
A set consisting of R _X9 and R ₅₉ adjacent to R _X9 ,
one or more of a pair consisting of R _X8 and R ₅₈ adjacent to R _X8 , and a pair consisting of R _X8A and R ₅₈ adjacent to R _X8A are
joined together to form a substituted or unsubstituted monocyclic ring, or
are bonded together to form a substituted or unsubstituted fused ring, or are not bonded together,
R ₅₆ , R ₅₈ , R ₅₉ , R _X6A , R _X8A , R _X8 and R _X9 which do not form the substituted or unsubstituted monocycle and do not form the substituted or unsubstituted fused ring each independently represent
Hydrogen atom,
Halogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted fluoroalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si( _R501 )( _R502 )( _R503 ),
A group represented by —O—(R ₅₀₄ ),
A group represented by -S-(R ₅₀₅ ),
a group represented by -N(R ₅₀₆ )(R ₅₀₇ );
A group represented by —C(═O)R ₅₀₈ ,
A group represented by —COOR ₅₀₉ ,
A group represented by -C(=O)-N( _R510 )( _R511 ),
A group represented by -P(=O)(R ₅₁₂ )(R ₅₁₃ ),
Cyano group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

(In the compound represented by the general formula (50), R ₅₀₁ to R ₅₁₃ each independently represent
Hydrogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
When a plurality of R ₅₀₁ are present, the plurality of R ₅₀₁ are the same or different,
When a plurality of R ₅₀₂ are present, the plurality of R ₅₀₂ are the same or different,
When a plurality of R ₅₀₃ are present, the plurality of R ₅₀₃ are the same or different,
When a plurality of R ₅₀₄ are present, the plurality of R ₅₀₄ are the same or different from each other,
When a plurality of R ₅₀₅ are present, the plurality of R ₅₀₅ are the same or different from each other,
When a plurality of R ₅₀₆ are present, the plurality of R ₅₀₆ are the same or different,
When a plurality of R _507s are present, the plurality of R _507s are the same or different from each other,
When a plurality of R ₅₀₈ are present, the plurality of R ₅₀₈ are the same or different from each other,
When a plurality of R ₅₀₉ are present, the plurality of R ₅₀₉ are the same or different from each other,
When a plurality of R ₅₁₀ are present, the plurality of R ₅₁₀ are the same or different from each other,
When a plurality of R ₅₁₁ are present, the plurality of R ₅₁₁ are the same or different,
When a plurality of R ₅₁₂ are present, the plurality of R ₅₁₂ are the same or different,
When a plurality of R ₅₁₃ are present, the plurality of R ₅₁₃ are the same or different.

In the general formula (50), the Ax ring, the Dx ring and the Ex ring each independently represent
a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 30 ring carbon atoms, or
A substituted or unsubstituted heterocyclic ring having 5 to 30 ring atoms is also preferred.

In the general formula (50), it is also preferable that the pair consisting of R ₅₄ and R ₅₅ form a substituted or unsubstituted aliphatic ring.

The compound represented by the general formula (50) is also preferably a compound represented by the following general formula (53):

(In the general formula (53),
A set consisting of R _X1 and R _X8A ;
A set consisting of R _X1 and R _X8 ;
A set consisting of R _X2 and R _X3 ;
A set consisting of R _X3 and R _X4 ;
One or more of a pair of R _X5 and R _X6 , and a pair of R _X6 and R _X7 ,
joined together to form a substituted or unsubstituted monocyclic ring, or
are bonded together to form a substituted or unsubstituted fused ring, or are not bonded together,
R _X1 , R _X2 , R _X3 , R _X4 , R _X5 , R _X6 , R _X7 , R _X8A and R _X8 which do not form the substituted or unsubstituted monocycle and do not form the substituted or unsubstituted fused ring are each independently
Hydrogen atoms,
Halogen atoms,
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted fluoroalkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si( _R501 )( _R502 )( _R503 ),
A group represented by —O—(R ₅₀₄ ),
A group represented by -S-(R ₅₀₅ ),
a group represented by -N(R ₅₀₆ )(R ₅₀₇ );
A group represented by —C(═O)R ₅₀₈ ,
A group represented by —COOR ₅₀₉ ,
A group represented by -C(=O)-N( _R510 )( _R511 ),
A group represented by -P(=O)(R ₅₁₂ )(R ₅₁₃ ),
Cyano group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
_X5 has the same meaning as _X5 in formula (50).
R ₅₄ has the same meaning as R ₅₄ in formula (50).
_X51 has the same meaning as _X51 in formula (52).
R ₅₄₁ has the same meaning as R ₅₄₁ in the general formula (52).

The compound represented by the general formula (50) is also preferably a compound represented by the following general formula (531):

(In the general formula (531),
R _x1 , R _x2 , R _x3 , R _x4 , R _x5 , R _x6 , R _x7 , R _x8A and R _x8 each independently have the same meaning as R _x1 , R _x2 , R _x3 , R _x4 , R _x5 , R _x6 , R _x7 , R _x8A and R _x8 in formula (53);
R ₅₄ has the same meaning as R ₅₄ in formula (50).
R ₅₄₁ has the same meaning as R ₅₄₁ in the general formula (52).

(In the general formula (531),
A set consisting of R _X1 and R _X8A ;
A set consisting of R _X1 and R _X8 ;
A set consisting of R _X2 and R _X3 ;
A set consisting of R _X3 and R _X4 ;
It is also preferable that one or more of the pair of R _{2 X5} and R _{2 X6} , and the pair of R _{2 X6} and R _{2 X7} form a ring structure represented by the following general formula (532) or a ring structure represented by the following general formula (533).

(In the general formulae (532) and (533),
R _V1 to R _V8 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 25 carbon atoms (preferably a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms, more preferably a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms), or a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms (preferably a substituted or unsubstituted aryl group having 6 to 10 ring carbon atoms, more preferably a substituted or unsubstituted aryl group having 6 ring carbon atoms);
W is C(R _V9 )(R _V10 ), an oxygen atom, a sulfur atom, or NR _V11 ;
R _V9 and R _V10 each independently represent a substituted or unsubstituted alkyl group having 1 to 25 carbon atoms (preferably, a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms, more preferably, a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms);
R _V11 is a substituted or unsubstituted alkyl group having 1 to 25 carbon atoms (preferably a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms, more preferably a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms) or a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms (preferably a substituted or unsubstituted aryl group having 6 to 10 ring carbon atoms, more preferably a substituted or unsubstituted aryl group having 6 ring carbon atoms),
* indicates the bonding positions to the Ax ring, the Dx ring, and the Ex ring, respectively.)

In the general formula (531), R ₅₄ and R ₅₄₁ are preferably each independently a methyl group, a tert-butyl group, —CF ₃ , an unsubstituted phenyl group, a p-tert-butylphenyl group, a xylyl group or a mesityl group.

In the general formula (531), R _X2 , R _X3 , R _X6 and R _X7 each independently represent a hydrogen atom, a methyl group, an ethyl group, an isopropyl group, a sec-propyl group, an n-butyl group, a tert-butyl group, -C(Me) ₂ C ₂ H ₅ , an unsubstituted phenyl group, a p-tert-butylphenyl group, a mesityl group, a xylyl group, an o-methylphenyl group or a substituted or unsubstituted biphenyl group (preferably an unsubstituted biphenyl group).

In the general formula (531), R _X1 , R _X8A and R _X8 are preferably each independently a hydrogen atom, a methyl group, an ethyl group, an n-butyl group, an unsubstituted phenyl group, -O-phenyl group, -NPh ₂ , an N-carbazolyl group or -N(C ₆ H ₅ ^t Bu) _2. Ph represents an unsubstituted phenyl group, and ^t Bu represents a tert-butyl group.

In the general formula (531), R _{1 X4} and R _{1 X5} are preferably a hydrogen atom.

In the general formula (531), R _X4 , R _X5 , R _X8A and R _X8 are preferably hydrogen atoms.

The compound represented by the general formula (50) is also preferably a compound represented by the following general formula (534):

(In the general formula (534), R _x1 , R _x2 , R _x3 , R _x6 and R _x7 are each independently defined as R _x1 , R _x2 , R _x3 , R _x6 and R _x7 in the general formula (53), R ₅₄ is defined as R ₅₄ in the general formula (50), and R ₅₄₁ is defined as R ₅₄₁ in the general formula (52).)

In the compound represented by the general formula (50), R ₅₀₁ to R ₅₁₃ each independently represent
a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
It is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

(Specific examples of compounds represented by formula (50))
Specific examples of the compound represented by the general formula (50) include the compounds shown below.

Second Embodiment
(Electronics)
The electronic device according to the present embodiment is equipped with any of the organic EL elements according to the above-mentioned embodiments. Examples of the electronic device include display devices and light-emitting devices. Examples of the display device include display components (e.g., organic EL panel modules), televisions, mobile phones, tablets, and personal computers. Examples of the light-emitting device include lighting and vehicle lamps.

[Modifications of the embodiment]
The present invention is not limited to the above-described embodiment, and any modifications and improvements that can achieve the object of the present invention are included in the present invention.

For example, the number of light-emitting layers is not limited to two, and more than two light-emitting layers may be laminated. When the organic EL element has more than two light-emitting layers, at least two of the light-emitting layers may satisfy the conditions described in the above embodiment. For example, the other light-emitting layer may be a fluorescent light-emitting layer or a phosphorescent light-emitting layer that utilizes light emission due to electronic transition from a triplet excited state directly to a ground state.
Furthermore, when the organic EL element has a plurality of light-emitting layers, these light-emitting layers may be provided adjacent to each other, or the organic EL element may be a so-called tandem type organic EL element in which a plurality of light-emitting units are stacked via an intermediate layer.

In addition, for example, a blocking layer may be provided adjacent to at least one of the anode side and the cathode side of the light-emitting layer. The blocking layer is preferably disposed in contact with the light-emitting layer and blocks at least one of holes, electrons, and excitons.
For example, when a blocking layer is disposed in contact with the cathode side of the light-emitting layer, the blocking layer transports electrons and prevents holes from reaching a layer (e.g., an electron transport layer) on the cathode side of the blocking layer. When the organic EL element includes an electron transport layer, it is preferable to include the blocking layer between the light-emitting layer and the electron transport layer.
In addition, when a blocking layer is disposed in contact with the light-emitting layer on the anode side, the blocking layer transports holes and prevents electrons from reaching a layer (e.g., a hole transport layer) on the anode side of the blocking layer. When the organic EL element includes a hole transport layer, it is preferable to include the blocking layer between the light-emitting layer and the hole transport layer.
A barrier layer may be provided adjacent to the light-emitting layer to prevent the excitation energy from leaking from the light-emitting layer to the surrounding layers, and prevents excitons generated in the light-emitting layer from migrating to layers on the electrode side of the barrier layer (e.g., the electron transport layer and the hole transport layer, etc.).
The light emitting layer and the barrier layer are preferably in contact with each other.

In addition, the specific structure and shape in implementing the present invention may be other structures, etc., as long as the object of the present invention can be achieved.

The present invention will be described in more detail below with reference to examples. The present invention is not limited to these examples.

<Compound>
The structures of the compounds used in the production of the organic EL device according to Example 1 are shown below.

The structure of the compound used in the manufacture of the organic EL element of Comparative Example 1 is shown below.

The structures of other compounds used in the manufacture of the organic EL elements of Example 1 and Comparative Example 1 are shown below.

<Preparation of Organic EL Element>
Example 1
A glass substrate (manufactured by Geomatec Co., Ltd.) with an ITO (Indium Tin Oxide) transparent electrode (anode) measuring 25 mm x 75 mm x 1.1 mm was ultrasonically cleaned in isopropyl alcohol for 5 minutes, and then UV ozone cleaned for 30 minutes. The film thickness of the ITO transparent electrode was 130 nm.
The cleaned glass substrate with transparent electrode lines was attached to a substrate holder of a vacuum deposition apparatus, and compound HT1 was co-deposited on the surface on which the transparent electrode lines were formed so as to cover the transparent electrode, thereby forming a hole injection layer with a thickness of 65 nm.
Compound HT2 was deposited on the hole injection layer to form a hole transport layer having a thickness of 45 nm.
On the hole transport layer, compound BH1 (first host material (BH)) and compound BD1 (first emitting compound (BD)) were co-deposited such that the ratio of compound BD1 was 1 mass %, to form a first emitting layer with a thickness of 20 nm.
On the first emitting layer, compound BH2 (second host material (BH)) and compound BD1 (second emitting compound (BD)) were co-deposited such that the ratio of compound BD1 was 1 mass %, to form a second emitting layer with a thickness of 5 nm.
A compound HBL was deposited on the second light-emitting layer to form a hole blocking layer (HBL) having a thickness of 5 nm.
A compound ET1 was deposited on the hole blocking layer to form an electron transport layer (ET) having a thickness of 20 nm.
Lithium fluoride (LiF) was deposited on the electron transport layer to form an electron injection layer having a thickness of 0.5 nm.
Metallic Al was evaporated onto the electron injection layer to form a cathode having a thickness of 150 nm.
The device configuration of Example 1 is shown in schematic form as follows.
ITO(130)/HT1(65)/HT2(45)/BH1:BD1(20,99%:1%)/BH2:BD1(5,99%:1%)/HBL(5)/ET1(20)/LiF(0.5)/Al(150)
The numbers in parentheses indicate the film thickness (unit: nm).
Similarly, in parentheses, the numbers expressed as percentages (99%:1%) indicate the proportions (mass %) of the host material (compound BH1 or BH2) and the light-emitting compound (compound BD1) in the first light-emitting layer or the second light-emitting layer.

Comparative Example 1
The organic EL element of Comparative Example 1 was produced in the same manner as the organic EL element of Example 1, except that the compound BD1 in the first emitting layer and the second emitting layer was changed to the compound Ref-BD as shown in Table 1.

<Evaluation of Organic EL Device>
The organic EL devices thus fabricated were subjected to the following evaluations. The evaluation results are shown in Table 1.

(Lifespan LT80)
A voltage was applied to the prepared organic EL element so that the current density was 50 mA/ ^cm2 , and the time until the luminance reached 80% of the initial luminance (LT80 (unit: hour)) was measured as the lifetime. The luminance was measured using a spectroradiometer CS-2000 (manufactured by Konica Minolta, Inc.).

As shown in Table 1, the organic EL element of Example 1, which has a first light-emitting layer and a second light-emitting layer containing a compound that satisfies the relationship of the formula (Formula 1) and (Formula 2), had a longer life than the organic EL element of Comparative Example 1, which does not satisfy the relationship of the formula (Formula 2).

<Method of evaluating compounds>
(Triplet energy T ₁ )
The compound to be measured was dissolved in EPA (diethyl ether: isopentane: ethanol = 5:5:2 (volume ratio)) to a concentration of 10 μmol/L, and the solution was placed in a quartz cell to prepare a measurement sample. The phosphorescence spectrum (vertical axis: phosphorescence emission intensity, horizontal axis: wavelength) of this measurement sample was measured at low temperature (77 [K]), a tangent was drawn to the rising edge of the phosphorescence spectrum on the short wavelength side, and the energy amount calculated from the following conversion formula (F1) based on the wavelength value λ _edge [nm] at the intersection of the tangent and the horizontal axis was defined as the triplet energy _T1 . Note that the triplet energy _T1 may have an error of about 0.02 eV depending on the measurement conditions.
Conversion formula (F1): T ₁ [eV]=1239.85/λ _edge

The tangent to the rising edge of the phosphorescence spectrum on the short wavelength side is drawn as follows. When moving along the spectral curve from the short wavelength side of the phosphorescence spectrum to the shortest maximum of the spectral maxima, consider the tangent at each point on the curve toward the long wavelength side. The slope of this tangent increases as the curve rises (i.e., as the vertical axis increases). The tangent drawn at the point where this slope is at its maximum (i.e., the tangent at the inflection point) is the tangent to the rising edge of the phosphorescence spectrum on the short wavelength side.
Note that a maximum point having a peak intensity of 15% or less of the maximum peak intensity of the spectrum is not included in the maximum value on the shortest wavelength side described above, and a tangent drawn at a point where the slope value is the maximum value that is closest to the maximum value on the shortest wavelength side is regarded as a tangent to the rising edge on the short wavelength side of the phosphorescence spectrum.
The phosphorescence was measured using a spectrofluorophotometer F-4500 manufactured by Hitachi High-Technologies Corporation.

(Singlet energy S ₁ )
A 10 μmol/L toluene solution of the compound to be measured was prepared and placed in a quartz cell, and the absorption spectrum (vertical axis: absorption intensity, horizontal axis: wavelength) of this sample was measured at room temperature (300 K). A tangent line was drawn to the falling edge on the long wavelength side of this absorption spectrum, and the wavelength value λedge [nm] at the intersection of the tangent line and the horizontal axis was substituted into the following conversion formula (F2) to calculate the singlet energy.
Conversion formula (F2): S ₁ [eV]=1239.85/λedge
The absorption spectrum measuring device used was a spectrophotometer manufactured by Hitachi Ltd. (device name: U3310).

The tangent to the fall on the long wavelength side of the absorption spectrum is drawn as follows. When moving on the spectral curve from the maximum value on the longest wavelength side among the maximum values of the absorption spectrum in the direction towards longer wavelengths, consider the tangent at each point on the curve. As the curve falls (i.e., as the value on the vertical axis decreases), the slope of this tangent decreases and then increases repeatedly. The tangent drawn at the point where the slope is at its minimum value on the longest wavelength side (excluding cases where the absorbance is 0.1 or less) is taken as the tangent to the fall on the long wavelength side of the absorption spectrum.
Note that maximum points with absorbance values of 0.2 or less are not included in the maximum values on the longest wavelength side.

(Highest Occupied Orbital (HOMO))
The energy level of the highest occupied molecular orbital (HOMO) was measured under atmospheric conditions using a photoelectron spectrometer ("AC-3" manufactured by Riken Keiki Co., Ltd.) Specifically, the energy level of the highest occupied molecular orbital (HOMO) of the compound was measured by irradiating the material with light and measuring the amount of electrons generated by charge separation during the irradiation.

(Lowest Unoccupied Molecular Orbital (LUMO))
In this specification, the energy level of the lowest unoccupied molecular orbital (LUMO) was calculated by the following formula (Math 1X) based on the measured energy level of the highest occupied molecular orbital (HOMO) and the singlet energy _S1 .
LUMO = HOMO + _S1 ... (Equation 1X)

(Measurement of maximum fluorescence emission peak wavelength (FL-peak))
The compound to be measured was dissolved in toluene at a concentration of 4.9×10 ⁻⁶ mol/L to prepare a toluene solution. The maximum fluorescence emission peak wavelength λ (unit: nm) was measured when the toluene solution was excited at 390 nm using a fluorescence spectrum measuring device (fluorescence spectrophotometer F-7000 (manufactured by Hitachi High-Tech Science Corporation)). The maximum fluorescence emission peak wavelength λ is the same value as the PL maximum peak wavelength λ _PL described below.

(Measurement of the integral value of the emission spectrum)
The compound to be measured was dissolved in toluene at a concentration of 4.9×10 ⁻⁶ mol/L to prepare a toluene solution, and a sample for measuring the integrated value of the emission spectrum was prepared.
The photoluminescence spectrum (PL spectrum) was measured using the sample for integral value measurement. The PL spectrum was measured using a spectrofluorometer F-7000 manufactured by Hitachi High-Tech Science Corporation. The area of the spectrum (total integral value ITG(B)) in the visible range (wavelength range of 380 nm or more and 700 nm or less) of the obtained PL spectrum was calculated. Furthermore, the area of the spectrum (integral value ITG(A)) in the range of 10 nm around the wavelength of the peak where the PL intensity is maximum (PL maximum peak wavelength λ _PL ) in the obtained PL spectrum was calculated. The ratio of the integral value ITG(A) to the total integral value ITG(B) was calculated by the following formula (3A).
{ITG(A)/ITG(B)}×100 (Equation 3A)

The values for compound evaluation are shown in Table 2.

<Synthesis Example>
(Synthesis of compound BD1)
Synthesis of intermediate 1-1

1-Bromo-2-fluoro-3-nitrobenzene (87.8 g, 399 mmol) was added to 130 mL of trifluoromethanesulfonic acid, and the solution was cooled to 0°C. N-iodosuccinimide (116.5 g, 517 mmol) was added thereto, and the mixture was stirred at room temperature for 19 hours. The reaction solution was poured into 400 mL of water, neutralized with 40% aqueous sodium hydroxide solution, and extracted with heptane. The collected organic layer was washed with 10% aqueous sodium sulfite solution until it became colorless, washed with saturated saline, and then dried over magnesium sulfate. The solid was removed by filtration, and the filtrate was concentrated. The obtained oil was purified by distillation to obtain a yellow oil (102.5 g, yield 71%). The obtained oil was the target intermediate 1-1, and as a result of mass spectrometry analysis, it was found to have an m/z of 346 for a molecular weight of 346.

- Synthesis of intermediate 1-2

Under a nitrogen atmosphere, intermediate 1-1 (70.0 g, 202 mmol), 3-t-butylphenylboronic acid (39.6 g, 223 mmol), and potassium phosphate (107 g, 506 mmol) were suspended in a mixed solvent of 280 mL of toluene, 210 mL of 1,4-dioxane, and 140 mL of water. Tetrakis(triphenylphosphine)palladium (4.68 g, 4.05 mmol) was further added, and the mixture was stirred at 80°C for 24 hours. After cooling to room temperature, the aqueous layer was extracted with toluene, and the collected organic layer was washed with saturated saline and dried over magnesium sulfate. The solid was filtered off and concentrated to obtain a brown oily substance. Methanol was poured into the oily substance to crystallize it, and the obtained crystals were filtered and washed with methanol to obtain a white solid (43 g, yield 60%). The obtained solid was intermediate 1-2, the target product, and the mass spectrum showed that the molecular weight was 352 and the m/z was 352.

- Synthesis of intermediate 1-3

Under a nitrogen atmosphere, intermediate 1-2 (35.2 g, 100 mmol), 1,3-diaminobenzene (4.5 g, 41.6 mmol), and sodium hydrogen carbonate (7.7 g, 92 mmol) were added to 60 mL of dimethyl sulfoxide and stirred at 100 °C for 48 hours. The reaction solution was cooled to room temperature, and 30 mL of methanol and 15 mL of water were added. The resulting solid was filtered and washed with methanol and water. The solid was added to 80 mL of ethanol and heated and stirred, and the remaining solid was filtered to obtain a red solid (26.7 g, 83% yield). The resulting solid was intermediate 1-3, the target product, and mass spectrometry showed that the molecular weight was 828 and the m/z was 828.

Synthesis of intermediate 1-4

Intermediate 1-3 (17.7 g, 22.9 mmol) was dissolved in 650 mL of tetrahydrofuran, 60 mL of methanol was added, and the mixture was heated to 50°C, and ammonium chloride (73.5 g, 1.375 mol) was added. Zinc powder (33.7 g, 412 mmol) was then gradually added and stirred for 2 hours. Ammonium chloride (35.0 g, 654 mmol) and zinc powder (17.5 g, 267 mmol) were then added and stirred at 50°C for 18 hours. After cooling to room temperature, the solid was filtered off, and the filtrate was concentrated. 200 mL of water was added to the residue and extracted with ethyl acetate. The collected organic layer was washed with water and saturated saline, and dried over magnesium sulfate. The solution was concentrated to obtain a pink solid (14.3 g, 87% yield). The obtained solid was intermediate 1-4, the target product, and the mass spectrum showed that the molecular weight was 768 and the m/z was 768.

- Synthesis of intermediate 1-5

Sodium bisulfite (31.5 g, 303 mmol) was suspended in 30 mL of dimethylacetamide (DMA) and stirred at 120 °C. Intermediate 1-4 (9.69 g, 12.6 mmol) dissolved in 30 mL of dimethylacetamide was added thereto, and 1-naphthylaldehyde (7.89 g, 50.5 mmol) dissolved in 30 mL of dimethylacetamide was added dropwise, and the mixture was stirred at 130 °C for 24 hours. After cooling to room temperature, the reaction mixture was poured into 500 mL of methanol, and 500 mL of water and 500 mL of methanol were added while stirring. The resulting solid was filtered and washed with methanol. The solid was crystallized using 250 mL of methylene chloride and 100 mL of heptane. The resulting solid was filtered and washed with heptane to obtain a white solid (9.71 g, yield 74%). The solid obtained was the target intermediate 1-5, and mass spectrometry showed that the molecular weight was 1040 and the m/z was 1040.

・Synthesis of compound BD1

Intermediate 1-5 (6.62 g, 6.36 mmol) was dissolved in 400 mL of t-butylbenzene, cooled to -50°C, and 1.7 M t-butyllithium (t-BuLi) pentane solution (15 mL, 25.4 mmol) was added dropwise. After stirring at room temperature for 45 minutes, it was cooled again to -50°C, and boron tribromide (6.38 g, 25.4 mmol) was added dropwise. The mixture was warmed to room temperature and stirred for 2 hours, and the reaction solution was added to 1200 mL of ice water and 200 mL of 1 M sodium hydroxide using a cannula. It was then extracted with ethyl acetate, and the collected organic layer was washed with saturated saline and dried over magnesium sulfate. The resulting solution was concentrated, and the residue was purified by silica gel chromatography to obtain a yellow solid (0.34 g, 6% yield). The obtained solid was the target compound BD1, and the mass spectrum showed that the molecular weight was 890 and the m/z was 890.

1... organic EL element, 2... substrate, 3... anode, 4... cathode, 51... first light-emitting layer, 52... second light-emitting layer, 6... hole injection layer, 7... hole transport layer, 8... electron transport layer, 9... electron injection layer.

Claims (29)

An organic electroluminescence element,
An anode;
A cathode;
a first light-emitting layer disposed between the anode and the cathode;
a second light-emitting layer disposed between the first light-emitting layer and the cathode;
the first light-emitting layer and the second light-emitting layer are disposed, in this order, between the anode and the cathode;
the first light-emitting layer comprises a first host material;
the second light-emitting layer comprises a second host material;
the first host material and the second host material are different from each other,
the first light-emitting layer contains at least a first light-emitting compound,
the second light-emitting layer contains at least a second light-emitting compound,
the first luminescent compound and the second luminescent compound are the same or different from each other;
A triplet energy T ₁ (H1) of the first host material and a triplet energy T ₁ (H2) of the second host material satisfy the relationship of the following mathematical formula (Mathematical Formula 1),
an energy level of the lowest unoccupied molecular orbital (LUMO(H2)) of the second host material and an energy level of the lowest unoccupied molecular orbital (LUMO(D2)) of the second light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 2):
Organic electroluminescent element.
T ₁ (H1) < T ₁ (H2) ... (Equation 1)
|LUMO(D2)|-|LUMO(H2)|<0.74 eV ... (Equation 2) an integral ITG(A) of an emission spectrum at 10 nm around a maximum peak wavelength in the emission spectrum of the second luminescent compound and a total integral ITG(B) of the emission spectrum of the second luminescent compound satisfy the relationship of the following mathematical formula (Mathematical Formula 3):
The organic electroluminescence device according to claim 1 .
40≦{ITG(A)/ITG(B)}×100 (Equation 3) an energy level of the lowest unoccupied molecular orbital (LUMO(H2)) of the second host material and an energy level of the lowest unoccupied molecular orbital (LUMO(D2)) of the second light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 2D):
The organic electroluminescence device according to claim 1 or 2.
0 eV<|LUMO(D2)|-|LUMO(H2)| ... (Math 2D) The first luminescent compound has a maximum peak wavelength of 500 nm or less;
The organic electroluminescence device according to claim 1 . The second luminescent compound has a maximum peak wavelength of 500 nm or less.
The organic electroluminescence device according to claim 1 . an energy level HOMO (H1) of the highest occupied molecular orbital of the first host material and an energy level HOMO (D1) of the highest occupied molecular orbital of the first light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 4):
The organic electroluminescence device according to claim 1 .
|HOMO(D1)|-|HOMO(H1)|<0.21 eV ... (Equation 4) A singlet energy S ₁ (H1) of the first host material and a singlet energy S ₁ (D1) of the first light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 5):
The organic electroluminescence device according to claim 1 .
_S1 (H1)> _S1 (D1) ... (Equation 5) A triplet energy T ₁ (H1) of the first host material and a triplet energy T ₁ (D1) of the first light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 6):
The organic electroluminescence device according to claim 1 .
_T1 (D1)> _T1 (H1) ... (Equation 6) A singlet energy S ₁ (H2) of the second host material and a singlet energy S ₁ (D2) of the second light-emitting compound satisfy the relationship of the following mathematical formula (Mathematical Formula 7):
The organic electroluminescence device according to claim 1 .
S ₁ (H2)>S ₁ (D2) ... (Equation 7) A triplet energy T ₁ (D2) of the second light-emitting compound and a triplet energy T ₁ (H2) of the second host material satisfy the relationship of the following mathematical formula (Mathematical Formula 8):
The organic electroluminescence device according to claim 1 .
_T1 (D2)> _T1 (H2) (Equation 8) A triplet energy T ₁ (H1) of the first host material and a triplet energy T ₁ (H2) of the second host material satisfy the relationship of the following mathematical formula (Mathematical Formula 9):
The organic electroluminescence device according to claim 1 .
Organic electroluminescent element.
T ₁ (H2) - T ₁ (H1) > 0.03 eV (Equation 9) The thickness of the first light-emitting layer is greater than the thickness of the second light-emitting layer.
The organic electroluminescence device according to claim 1 . the first light-emitting layer and the second light-emitting layer are in direct contact with each other;
The organic electroluminescence device according to claim 1 . A triplet energy T ₁ (DX) of the first light-emitting compound or the second light-emitting compound, a triplet energy T ₁ (H1) of the first host material, and a triplet energy T ₁ (H2) of the second host material satisfy the relationship of the following mathematical formula (Mathematical Formula 10):
The organic electroluminescence device according to claim 1 .
2.6 eV> _T1 (DX)> _T1 (H2)> _T1 (H1) ... (Equation 10) A triplet energy T ₁ (DX) of the first luminescent compound or the second luminescent compound and a triplet energy T ₁ (H2) of the second host material satisfy the relationship of the following mathematical formula (Mathematical Formula 11):
The organic electroluminescence device according to claim 1 .
0 eV<T ₁ (DX)−T ₁ (H2)<0.6 eV (Equation 11) The triplet energy T ₁ (H2) of the second host material satisfies the relationship of the following formula (Formula 12):
The organic electroluminescence device according to claim 1 .
T ₁ (H2)>2.0 eV (Equation 12) The triplet energy T ₁ (H2) of the second host material satisfies the relationship of the following formula (Formula 12A):
The organic electroluminescence device according to claim 1 .
T ₁ (H2)>2.10 eV... (Equation 12A) The triplet energy T ₁ (H2) of the second host material satisfies the relationship of the following mathematical formula (Mathematical Formula 12C):
The organic electroluminescence device according to claim 1 .
2.08 eV> _T1 (H2)>1.87 eV... (Equation 12C) The triplet energy T ₁ (D1) of the first light-emitting compound satisfies the relationship of the following mathematical formula (Mathematical Formula 14A):
The organic electroluminescence device according to claim 1 .
2.60 eV>T ₁ (D1) ... (Equation 14A) The triplet energy T ₁ (D2) of the second light-emitting compound satisfies the relationship of the following mathematical formula (Mathematical Formula 14C):
The organic electroluminescence device according to claim 1 .
2.60 eV>T ₁ (D2) ... (Equation 14C) The triplet energy T ₁ (H1) of the first host material satisfies the relationship of the following formula (Formula 13):
The organic electroluminescence device according to claim 1 .
T ₁ (H1) ≧ 1.9 eV (Equation 13) The triplet energy T ₁ (H1) of the first host material satisfies the relationship of the following formula (Formula 13A):
The organic electroluminescence device according to claim 1 .
1.9 eV> _T1 (H1)≧1.8 eV (Equation 13A) the second host material has a linking structure including a benzene ring and a naphthalene ring linked by a single bond in a molecule;
the benzene ring and the naphthalene ring in the linking structure are each independently further condensed with a single ring or a condensed ring or are not condensed with a single ring or a condensed ring;
the benzene ring and the naphthalene ring in the linking structure are further linked by a bridge at at least one portion other than the single bond;
The organic electroluminescence device according to claim 1 . the bridge comprises a double bond;
The organic electroluminescence device according to claim 23. the second host material has a biphenyl structure in which a first benzene ring and a second benzene ring are connected by a single bond in a molecule;
the first benzene ring and the second benzene ring in the biphenyl structure are further linked by a bridge at at least one moiety other than the single bond;
The organic electroluminescence device according to claim 1 . the first benzene ring and the second benzene ring in the biphenyl structure are further linked by the bridge at one portion other than the single bond;
The organic electroluminescence device according to claim 25 . the bridge comprises a double bond;
27. The organic electroluminescence device according to claim 25 or 26. the first benzene ring and the second benzene ring in the biphenyl structure are further linked by the bridge at two portions other than the single bond,
The crosslinks do not contain double bonds;
The organic electroluminescence device according to claim 26. An electronic device equipped with an organic electroluminescence element according to any one of claims 1 to 28.

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