WO2023181736A1

WO2023181736A1 - Composition and method for manufacturing light-emitting element using same

Info

Publication number: WO2023181736A1
Application number: PCT/JP2023/005678
Authority: WO
Inventors: 直樹林; 敏之横藤田; 秀信柿本
Original assignee: 住友化学株式会社
Priority date: 2022-03-25
Filing date: 2023-02-17
Publication date: 2023-09-28
Also published as: JP7348417B1; JP2023143711A; TW202348779A

Abstract

Provided is a composition useful for manufacturing a light-emitting element having excellent light-emitting efficiency. Further provided is a method for manufacturing the light-emitting element formed using the composition.　The composition contains a polymer compound A that includes structural units represented by formula (1), a polymer compound B that includes structural units represented by formula (2), and a solvent.

Description

Composition and method for producing light emitting device using the same

The present invention relates to a composition and a method for manufacturing a light emitting device using the same.

Light-emitting devices such as organic electroluminescent devices can be suitably used for display and lighting applications. As a method for forming an organic layer of a light-emitting device, a wet method using a solvent is advantageous from the viewpoint of simplifying the manufacturing process for a large-area device and reducing manufacturing costs. For example, Patent Document 1 describes a composition containing a polymer phosphor, a nonionic surfactant, and a solvent as a composition used in a wet method. Note that the polymer phosphor is a polymer compound that does not contain a structural unit represented by formula (1) described below.

Japanese Patent Application Publication No. 2004-315679

However, light emitting devices formed using the above compositions did not necessarily have sufficient luminous efficiency.
Therefore, an object of the present invention is to provide a composition useful for manufacturing a light emitting element with excellent luminous efficiency. Another object of the present invention is to provide a method for manufacturing a light emitting device formed using the composition.

The present invention provides the following [1] to [15].
[1] A composition containing a polymer compound A containing a structural unit represented by formula (1), a polymer compound B containing a structural unit represented by formula (2), and a solvent.

[In the formula,
Ar represents an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of Ars may be the same or different.
Ar' is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group, and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of Ar's may be the same or different.
Z is a condensed ring arylene group or a condensed ring divalent heterocyclic group, and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. ]

[In the formula,
B ¹ represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a hydroxyalkyl group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a halogen atom; The group may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of B ¹ 's may be the same or different.
s represents an integer greater than or equal to 0. A plurality of s may be the same or different. ]
[2] The content of the polymer compound A is more than 1000 mass ppm relative to the solvent, and the content of the polymer compound B is more than 0 mass ppm and 1000 mass ppm relative to the solvent. The composition according to [1] below.
[3] The method according to [1] or [2], wherein the Ar is an arylene group that may have a substituent, and the Ar′ is an aryl group that may have a substituent. Composition.
[4] Any one of [1] to [3], wherein the Ar is a phenylene group that may have a substituent, and the Ar' is a phenyl group that may have a substituent. The composition described in .
[5] The above Z is a bicyclic, tricyclic, tetracyclic, pentacyclic or hexacyclic arylene group, or a bicyclic, tricyclic, tetracyclic, pentacyclic or hexacyclic arylene group. The composition according to any one of [1] to [4], which is a divalent heterocyclic group of the formula, and these groups may have a substituent.
[6] Z is a tricyclic arylene group or a tricyclic divalent heterocyclic group, and these groups may have a substituent, [1] to [5] The composition according to any one of.
[7] The composition according to any one of [1] to [6], wherein B ¹ is an alkyl group or an aryl group, and these groups may have a substituent.
[8] The polymer compound A further includes at least one structural unit selected from the group consisting of a structural unit represented by formula (Y) and a structural unit represented by formula (X), [1] The composition according to any one of [7] to [7].

[In the formula, Ar ^Y1 represents an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded; The group may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. ]

[In the formula,
a ^X1 and a ^X2 each independently represent an integer of 0 or more.
Ar ^X1 and Ar ^X3 each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded.
Ar ^X2 and Ar ^X4 each independently represent an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded. and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. When there is a plurality of Ar ^x2 , they may be the same or different. When a plurality of Ar ^X4 's exist, they may be the same or different.
R ^X1 , R ^X2 and R ^X3 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. When a plurality of R ^x2s exist, they may be the same or different. When a plurality of R ^X3s exist, they may be the same or different. ]
[9] The polymer compound A includes a structural unit represented by formula (Y-1) or a structural unit represented by formula (Y-2) as the structural unit represented by formula (Y). , the composition according to [8].

[In the formula,
R ^Y1 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a fluorine atom, and these groups are substituents. It may have. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of R ^Y1s may be the same or different, and may be bonded to each other to form a ring with the carbon atoms to which they are bonded.
X ^Y1 represents a group represented by -C(R ^Y2 ) ₂ -, -C(R ^Y2 )=C(R ^Y2 )-, or -C(R ^Y2 ) ₂ -C(R ^Y2 ) ₂ -. R ^Y2 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a fluorine atom, and these groups are substituents. It may have. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of R ^Y2s may be the same or different, and may be bonded to each other to form a ring with the carbon atoms to which they are bonded. ]
[10] The composition according to any one of [1] to [9], wherein the solvent is an aromatic hydrocarbon solvent or an aromatic ether solvent.
[11] The composition according to any one of [1] to [10], wherein the solvent contains two or more types of solvents.
[12] The composition according to [11], wherein at least one of the two or more solvents is an aromatic hydrocarbon solvent or an aromatic ether solvent.
[13] According to [11] or [12], at least two of the two or more solvents are at least two selected from the group consisting of aromatic hydrocarbon solvents and aromatic ether solvents. Composition of.
[14] Any of [1] to [13], further containing at least one selected from the group consisting of a hole transport material, a hole injection material, an electron transport material, an electron injection material, a luminescent material, and an antioxidant. The composition according to crab.
[15] A method for manufacturing a light-emitting element comprising an anode, a cathode, and one or more organic layers provided between the anode and the cathode,
The method for manufacturing the light-emitting device, comprising the step of forming at least one of the organic layers by a wet method using the composition according to any one of [1] to [14].

According to the present invention, a composition useful for manufacturing a light emitting element with excellent luminous efficiency can be provided. Further, according to the present invention, it is possible to provide a method for manufacturing a light emitting element formed using the composition.

Hereinafter, preferred embodiments of the present invention will be described in detail.

<Explanation of common terms>
Terms commonly used herein have the following meanings unless otherwise specified.

Me represents a methyl group, Et represents an ethyl group, Bu represents a butyl group, i-Pr represents an isopropyl group, and t-Bu represents a tert-butyl group.
The hydrogen atom may be a deuterium atom or a light hydrogen atom.
In the formula representing a metal complex, a solid line representing a bond with the central metal means an ionic bond, a covalent bond, or a coordinate bond.
"Low molecular compound" means a compound that has no molecular weight distribution and has a molecular weight of 1×10 ⁴ or less.
The term "polymer compound" means a polymer having a molecular weight distribution and a number average molecular weight in terms of polystyrene of 1×10 ³ to 1×10 ⁸ .
The polymer compound may be a block copolymer, a random copolymer, an alternating copolymer, a graft copolymer, or may have other forms.
The terminal group of the polymer compound is preferably a stable group because when the polymer compound is used in a light emitting device, the light emitting device has excellent light emitting characteristics. The terminal group of the polymer compound is preferably a group that is conjugated to the main chain of the polymer compound, such as an aryl group or a group that is conjugated to the main chain of the polymer compound via a carbon-carbon bond. valent heterocyclic groups.
"Structural unit" means one or more units present in a polymer compound. A structural unit that exists two or more in a polymer compound is generally also called a "repeat unit."

The "alkyl group" may be either straight chain or branched. The number of carbon atoms in the straight chain alkyl group, not including the number of carbon atoms in substituents, is usually 1 to 50, preferably 1 to 30, more preferably 1 to 20, and even more preferably 1. ~10. The number of carbon atoms in the branched alkyl group, not including the number of carbon atoms in the substituents, is usually 3 to 50, preferably 3 to 30, more preferably 4 to 20, and still more preferably 4 to 50. It is 10.
The alkyl group may have a substituent. Examples of the alkyl group include methyl group, ethyl group, propyl group, isopropyl group, butyl group, 2-butyl group, isobutyl group, tert-butyl group, pentyl group, isoamyl group, 2-ethylbutyl group, hexyl group, and heptyl group. group, octyl group, 2-ethylhexyl group, 3-propylheptyl group, decyl group, 3,7-dimethyloctyl group, 2-ethyloctyl group, 2-hexyldecyl group, dodecyl group, and hydrogen atoms in these groups A group in which part or all of 4-methylphenyl)propyl group, 3-(3,5-di-hexylphenyl)propyl group and 6-ethyloxyhexyl group).
The number of carbon atoms in the "cycloalkyl group" is usually 3 to 50, preferably 3 to 30, more preferably 4 to 20, and still more preferably 4. ~10.
The cycloalkyl group may have a substituent. Examples of the cycloalkyl group include a cyclohexyl group, a methylcyclohexyl group, an ethylcyclohexyl group, and groups in which some or all of the hydrogen atoms in these groups are substituted with a substituent.
"Aryl group" means an atomic group remaining after removing one hydrogen atom directly bonded to a carbon atom constituting a ring from an aromatic hydrocarbon. The number of carbon atoms in the aryl group, not including the number of carbon atoms in substituents, is usually 6 to 60, preferably 6 to 40, more preferably 6 to 20, and still more preferably 6 to 10. be.
The aryl group may have a substituent. Examples of the aryl group include phenyl group, 1-naphthyl group, 2-naphthyl group, 1-anthracenyl group, 2-anthracenyl group, 9-anthracenyl group, 1-pyrenyl group, 2-pyrenyl group, 4-pyrenyl group, 2-fluorenyl group, 3-fluorenyl group, 4-fluorenyl group, 2-phenylphenyl group, 3-phenylphenyl group, 4-phenylphenyl group, and some or all of the hydrogen atoms in these groups are substituents. Examples include substituted groups.

The "alkoxy group" may be either straight chain or branched. The number of carbon atoms in the straight chain alkoxy group, not including the number of carbon atoms in substituents, is usually 1 to 50, preferably 1 to 20, and more preferably 1 to 10. The number of carbon atoms in the branched alkoxy group, not including the number of carbon atoms in substituents, is usually 3 to 50, preferably 4 to 20, more preferably 4 to 10.
The alkoxy group may have a substituent. Examples of the alkoxy group include methoxy group, ethoxy group, propyloxy group, isopropyloxy group, butyloxy group, isobutyloxy group, tert-butyloxy group, pentyloxy group, hexyloxy group, heptyloxy group, octyloxy group, -Ethylhexyloxy group, nonyloxy group, decyloxy group, 3,7-dimethyloctyloxy group, lauryloxy group, and groups in which some or all of the hydrogen atoms in these groups are substituted with substituents.
The number of carbon atoms in the "cycloalkoxy group", not including the number of carbon atoms in substituents, is usually 3 to 40, preferably 4 to 10.
The cycloalkoxy group may have a substituent. Examples of the cycloalkoxy group include a cyclohexyloxy group and a group in which some or all of the hydrogen atoms in the group are substituted with a substituent.
The number of carbon atoms in the "aryloxy group" is usually 6 to 60, preferably 6 to 40, more preferably 6 to 20, and still more preferably 6. ~10.
The aryloxy group may have a substituent. Examples of the aryloxy group include phenoxy group, 1-naphthyloxy group, 2-naphthyloxy group, 1-anthracenyloxy group, 9-anthracenyloxy group, 1-pyrenyloxy group, and Examples include groups in which some or all of the hydrogen atoms are substituted with substituents.

A "p-valent heterocyclic group" (p represents an integer of 1 or more) means a heterocyclic compound in which p hydrogen atoms are directly bonded to carbon atoms or heteroatoms constituting the ring. means the remaining atomic group excluding the hydrogen atom. Among p-valent heterocyclic groups, it is an atomic group remaining after removing p hydrogen atoms from the hydrogen atoms directly bonded to the carbon atoms or heteroatoms constituting the ring from an aromatic heterocyclic compound. A "p-valent aromatic heterocyclic group" is preferred.
"Aromatic heterocyclic compounds" are heterocyclic compounds such as oxadiazole, thiadiazole, thiazole, oxazole, thiophene, pyrrole, phosphole, furan, pyridine, pyrazine, pyrimidine, triazine, pyridazine, quinoline, isoquinoline, carbazole, dibenzophosphole, etc. Compounds in which the ring itself is aromatic, and heterocycles such as phenoxazine, phenothiazine, dibenzoborole, dibenzosilole, benzopyran, etc., have an aromatic ring condensed to the heterocycle even if they do not themselves exhibit aromaticity. means a compound.

The number of carbon atoms in the monovalent heterocyclic group, not including the number of carbon atoms in substituents, is usually 1 to 60, preferably 2 to 40, and more preferably 3 to 20. The number of heteroatoms in the monovalent heterocyclic group is usually 1 to 30, preferably 1 to 10, more preferably 1 to 5, and even more preferably 1 to 3.
The monovalent heterocyclic group may have a substituent. Examples of monovalent heterocyclic groups include thienyl group, pyrrolyl group, furyl group, pyridyl group, piperidinyl group, quinolinyl group, isoquinolinyl group, pyrimidinyl group, triazinyl group, and some of the hydrogen atoms in these groups. Or a group completely substituted with a substituent can be mentioned.

"Halogen atom" refers to a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom.

The "amino group" may have a substituent, and a substituted amino group is preferable. The substituent that the amino group has is preferably an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group, and these groups may further have a substituent.
The substituted amino group may further have a substituent. Examples of substituted amino groups include dialkylamino groups, dicycloalkylamino groups, diarylamino groups, and groups in which some or all of the hydrogen atoms in these groups are substituted with substituents.
Examples of amino groups and substituted amino groups include dimethylamino group, diethylamino group, diphenylamino group, bis(4-methylphenyl)amino group, bis(4-tert-butylphenyl)amino group, bis(3,5- Examples include di-tert-butylphenyl)amino groups, and groups in which some or all of the hydrogen atoms in these groups are substituted with substituents.

The "alkenyl group" may be either straight chain or branched. The number of carbon atoms in the straight chain alkenyl group, not including the number of carbon atoms in substituents, is usually 2 to 50, preferably 2 to 20, and more preferably 2 to 10. The number of carbon atoms in the branched alkenyl group, not including the number of carbon atoms in substituents, is usually 3 to 50, preferably 4 to 20, and more preferably 4 to 10. The number of carbon atoms in the "cycloalkenyl group", not including the number of carbon atoms in substituents, is usually 3 to 30, preferably 4 to 20, and more preferably 4 to 10.
The alkenyl group and cycloalkenyl group may have a substituent. Examples of the alkenyl group and cycloalkenyl group include vinyl group, 1-propenyl group, 2-propenyl group, 2-butenyl group, 3-butenyl group, 3-pentenyl group, 4-pentenyl group, 1-hexenyl group, Examples include -hexenyl group, 7-octenyl group, and groups in which some or all of the hydrogen atoms in these groups are substituted with substituents.

The "alkynyl group" may be either straight chain or branched. The number of carbon atoms in the alkynyl group, excluding carbon atoms of substituents, is usually 2 to 50, preferably 3 to 20, and more preferably 3 to 10. The number of carbon atoms in the branched alkynyl group, excluding carbon atoms of substituents, is usually 4 to 30, preferably 4 to 20, and more preferably 4 to 10.
The number of carbon atoms in the "cycloalkynyl group", excluding carbon atoms of substituents, is usually 4 to 50, preferably 5 to 20, and more preferably 6 to 10.
The alkynyl group and cycloalkynyl group may have a substituent. Examples of the alkynyl group and cycloalkynyl group include ethynyl group, 1-propynyl group, 2-propynyl group, 2-butynyl group, 3-butynyl group, 3-pentynyl group, 4-pentynyl group, 1-hexynyl group, 5 Examples include -hexynyl groups and groups in which some or all of the hydrogen atoms in these groups are substituted with substituents.

"Arylene group" means an atomic group remaining after removing two hydrogen atoms directly bonded to carbon atoms constituting a ring from an aromatic hydrocarbon. The number of carbon atoms in the arylene group, not including the number of carbon atoms in substituents, is usually 6 to 60, preferably 6 to 40, and more preferably 6 to 20.
The arylene group may have a substituent. Examples of the arylene group include a phenylene group, a naphthalenediyl group, an anthracenediyl group, a phenanthrenediyl group, a dihydrophenanthrenediyl group, a naphthacenediyl group, a fluorenediyl group, a pyrenediyl group, a perylene diyl group, a chrysenediyl group, and Examples include groups in which some or all of the hydrogen atoms are substituted with substituents, and groups represented by formulas (A-1) to (A-20) are preferred. The arylene group includes a group in which a plurality of these groups are bonded.

[In the formula, R and R ^a are each independently a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a fluorine group. represents an atom, and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of R's may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of R ^a 's may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. ]

The number of carbon atoms in the divalent heterocyclic group, not including the number of carbon atoms in substituents, is usually 1 to 60, preferably 2 to 40, more preferably 3 to 20. The number of heteroatoms in the divalent heterocyclic group is usually 1 to 30, preferably 1 to 10, more preferably 1 to 5, and even more preferably 1 to 3.
The divalent heterocyclic group may have a substituent. Examples of divalent heterocyclic groups include pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, dibenzosilole, phenoxazine, phenothiazine, acridine, dihydroacridine, dihydrophenazine, furan, and thiophene. , a divalent group obtained by removing two hydrogen atoms directly bonded to a carbon atom or a heteroatom constituting a ring from azole, diazole, or triazole, and a portion of the hydrogen atoms in the group. or a divalent group entirely substituted with a substituent, preferably groups represented by formulas (AA-1) to (AA-34). The divalent heterocyclic group includes a group in which a plurality of these groups are bonded.

[In the formula, R and R ^a have the same meanings as above. ]

A "crosslinking group" is a group that can form a new bond by being subjected to heating, ultraviolet irradiation, near ultraviolet ray irradiation, visible light irradiation, infrared ray irradiation, radical reaction, etc. The crosslinking group is preferably a group represented by any one of formulas (XL-1) to (XL-19). The crosslinking group may have a substituent.

[In the formula, R ^XL represents a methylene group, an oxygen atom, or a sulfur atom, and n ^XL represents an integer of 0 to 5. When multiple R ^XL 's exist, they may be the same or different. A plurality of ^nXLs may be the same or different. *1 represents the bonding position. These crosslinking groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. ]

Examples of the "substituent" include a halogen atom, a cyano group, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, an alkoxy group, a cycloalkoxy group, an aryloxy group, an amino group, a substituted amino group, Examples include alkenyl groups, cycloalkenyl groups, alkynyl groups and cycloalkynyl groups. The substituent may be a bridging group. In addition, when a plurality of substituents exist, they may be bonded to each other to form a ring with the atoms to which they are bonded, but it is preferable that they do not form a ring.

<Composition of this embodiment>
The composition of the present embodiment contains a polymer compound A containing a structural unit represented by formula (1), a polymer compound B containing a structural unit represented by formula (2), and a solvent. It is a composition.
In the composition of this embodiment, the polymer compound A, the polymer compound B, and the solvent are different components.
The composition of this embodiment may contain only one type of each of polymer compound A, polymer compound B, and solvent, or may contain two or more types of polymer compound A, polymer compound B, and solvent.
The composition of this embodiment can be suitably used, for example, as a composition for a light emitting device. A light-emitting element formed using the composition of this embodiment (hereinafter also referred to as "light-emitting element of this embodiment") has better luminous efficiency.

In the composition of this embodiment, the total content of polymer compound A, polymer compound B, and solvent is such that the function as a composition (for example, a composition for a light emitting device, and the same applies hereinafter) is determined. It may be within the range that can be played. In the composition of the present embodiment, the total content of the polymer compound A, the polymer compound B, and the solvent may be, for example, 1 to 100% by mass based on the total amount of the composition. Since the luminous efficiency of the device is better, the amount is preferably 10 to 100% by mass, more preferably 30 to 100% by mass, even more preferably 50 to 100% by mass, and particularly preferably 70 to 100% by mass. The content is particularly preferably 90 to 100% by mass.

In the composition of this embodiment, the content of the polymer compound A may be within a range that allows the composition to function as a composition. In the composition of the present embodiment, the content of the polymer compound A may be, for example, more than 0 mass ppm, 10 mass ppm or more, or 100 mass ppm with respect to the content of the solvent. It may be more than 1000 mass ppm, and since the luminous efficiency of the light emitting element of this embodiment is more excellent, it is preferably more than 1000 mass ppm, more preferably more than 1000 mass ppm 100% by mass. or less, more preferably more than 1000 mass ppm and 50 mass% or less, particularly preferably more than 1000 mass ppm and 30 mass% or less, particularly preferably 3000 mass ppm or more and 10 mass% or less, even more preferably 5000 mass ppm or less The content is preferably 7000 ppm or more and 2% by mass or less, particularly preferably 7000 ppm or more and 2% by mass or less.

In the composition of the present embodiment, the content of the polymer compound B may be within a range that allows the composition to function as a composition. In the composition of the present embodiment, the content of the polymer compound B may be, for example, more than 0 mass ppm and 100 mass% or less, or more than 0 mass ppm and 50 mass% or less, with respect to the content of the solvent. It may be more than 0 mass ppm and 10 mass % or less, and it may be more than 0 mass ppm and 1 mass % or less, and since the luminous efficiency of the light emitting element of this embodiment is more excellent, it is preferably 0 mass ppm. It is more than 0 mass ppm and 5000 mass ppm or less, more preferably more than 0 mass ppm and 1000 mass ppm or less, and even more preferably 0.01 mass ppm or more and 1000 mass ppm or less, and the luminous efficiency of the light emitting element of this embodiment is Since it is even better, it is preferably 0.1 mass ppm or more and 1000 mass ppm or less, more preferably 0.5 mass ppm or more and 1000 mass ppm or less, and even more preferably 1 mass ppm or more and less than 1000 mass ppm. Particularly preferably, the content is 5 ppm or more and 500 ppm or less, particularly preferably 10 ppm or more and 100 ppm or less.

In the composition of this embodiment, the content of polymer compound A is preferably greater than the content of polymer compound B, since the luminous efficiency of the light emitting element of this embodiment is more excellent. In the composition of this embodiment, the content of the solvent is preferably greater than the content of polymer compound A, since the luminous efficiency of the light emitting element of this embodiment is more excellent. In the composition of this embodiment, since the luminous efficiency of the light emitting element of this embodiment is more excellent, the content of polymer compound A is greater than the content of polymer compound B, and the content of the solvent is It is preferable that the content is higher than the content of polymer compound A.

[Polymer compound A]
The polymer compound A is a polymer compound containing a structural unit represented by formula (1). It is preferable that the polymer compound A is a polymer compound that does not contain the structural unit represented by formula (2).

(Constituent unit represented by formula (1))
Ar is preferably an arylene group which may have a substituent, since the light emitting element of this embodiment has better luminous efficiency.
Examples and preferred ranges of the arylene group and divalent heterocyclic group in Ar are respectively the same as the examples and preferred ranges of the arylene group and divalent heterocyclic group represented by Ar ^Y1 described below.
The examples and preferred ranges of the substituents that the group represented by Ar may have are the same as the examples and preferred ranges of the substituents that the group represented by Ar ^Y1 described below may have, respectively.

Ar' is preferably an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group, and more preferably an aryl group or a monovalent heterocyclic group, since the luminous efficiency of the light emitting element of this embodiment is more excellent. It is a heterocyclic group, more preferably an aryl group, and these groups may have a substituent.
Examples and preferred ranges of the aryl group and monovalent heterocyclic group in Ar' are the examples of the aryl group and monovalent heterocyclic group in the substituent that the group represented by Ar ^Y1 described below may have, respectively. and the same as the preferred range.
The examples and preferred ranges of the substituents that the group represented by Ar' may have are the same as the examples and preferred ranges of the substituents that the group represented by Ar ^Y1 described below may have, respectively. .

Since the luminous efficiency of the light emitting element of this embodiment is more excellent, it is preferable that Ar be an arylene group which may have a substituent and Ar' be an aryl group which may have a substituent. Preferably, Ar is a phenylene group which may have a substituent, and more preferably Ar' is a phenyl group which may have a substituent.

Z is preferably an arylene group which is a condensed ring and which may have a substituent since the light emitting element of this embodiment has better luminous efficiency. As for the arylene group which is a condensed ring, at least one ring constituting the condensed ring may be an aromatic hydrocarbon ring.

The number of carbon atoms in the arylene group, which is a condensed ring, is usually 7 to 60, preferably 8 to 40, more preferably 9 to 30, and still more preferably It is 10-20.
Examples of the arylene group that is a condensed ring include aromatic hydrocarbons that are condensed rings (for example, bicyclic aromatic hydrocarbons such as naphthalene, indene, naphthoquinone, indenone, and tetralone; anthracene, phenanthrene, dihydrophenanthrene, and fluorene). , anthraquinone, phenanthquinone and fluorenone; tetracyclic aromatic hydrocarbons such as benzanthracene, benzophenanthrene, benzofluorene, pyrene and fluoranthene; dibenzoanthracene, dibenzophenanthrene, dibenzofluorene , pentacyclic aromatic hydrocarbons such as indenofluorene, perylene and benzofluoranthene; hexacyclic aromatic hydrocarbons such as spirobifluorene; and benzospirobifluorene and acenaphthofluoranthene. A group obtained by removing two hydrogen atoms directly bonded to the carbon atoms constituting the ring (hereinafter referred to as n ^Z1 cyclic (n ^Z1 represents an integer of 2 or more) A group obtained by removing two hydrogen atoms directly bonded to ^the carbon atoms constituting the ring from an aromatic hydrocarbon of It may have. The arylene group, which is a condensed ring, includes a group in which a plurality of the above-mentioned groups are bonded.
The arylene group, which is a condensed ring, is preferably a bicyclic, tricyclic, tetracyclic, pentacyclic, or hexacyclic arylene group, since the luminous efficiency of the light emitting device of this embodiment is more excellent. More preferred are bicyclic, tricyclic, tetracyclic or pentacyclic arylene groups; bicyclic or tricyclic arylene groups; particularly preferred are tricyclic arylene groups; The group may have a substituent.
The arylene group, which is a condensed ring, is preferably a naphthalenediyl group, anthracenediyl group, phenanthrenediyl group, dihydrophenanthrenediyl group, naphthacenediyl group, fluorenediyl group, since the luminous efficiency of the light emitting element of this embodiment is further improved. A pyrenediyl group, a perylenediyl group, or a chrysendiyl group, more preferably a naphthalenediyl group, an anthracenediyl group, a phenanthrenediyl group, a dihydrophenanthrenediyl group, or a fluorenediyl group, still more preferably a formula (A-4) to A group represented by formula (A-9), formula (A-11), formula (A-12), formula (A-19) or formula (A-20), particularly preferably a group represented by formula (A- 7), a group represented by formula (A-9) or formula (A-19), and these groups may have a substituent.

The number of carbon atoms of the divalent heterocyclic group that is a condensed ring is usually 2 to 60, preferably 5 to 40, and more preferably 8 to 30, not including the number of carbon atoms of substituents. , more preferably 10 to 20. The number of heteroatoms of the divalent heterocyclic group that is a condensed ring is usually 1 to 30, preferably 1 to 10, and more preferably 1 to 5, not including the number of heteroatoms of substituents. , more preferably 1 to 3. Furthermore, the divalent heterocyclic group that is a condensed ring may be any type as long as at least one ring constituting the condensed ring is a heterocycle.
Examples of divalent heterocyclic groups that are condensed rings include heterocyclic compounds that are condensed rings (e.g., azanaphthalene, diazanaphthalene, benzofuran, benzothiophene, indole, azaindole, diazaindole, benzodiazole). , bicyclic heterocyclic compounds such as benzothiadiazole, benzotriazole, benzothiophene dioxide, benzothiophene oxide and benzopyranone; dibenzofuran, dibenzothiophene, dibenzothiophene dioxide, dibenzothiophene oxide, dibenzopyranone, dibenzoborole, Dibenzosilole, dibenzophosphole, dibenzoselenophene, carbazole, azacarbazole, diazacarbazole, phenoxazine, phenothiazine, 9,10-dihydroacridine, 5,10-dihydrophenazine, acridone, fenazaborin, phenophosfazine, phenoselenazine , phenazacillin, azaanthracene, diazaanthracene, azaphenanthrene and diazaphenanthrene; tricyclic heterocyclic compounds such as hexaazatriphenylene, benzocarbazole, azabenzocarbazole, diazabenzocarbazole, benzonaphthofuran and benzonaphthothiophene 4-ring heterocyclic compounds such as dibenzocarbazole, indolocarbazole, indenocarbazole, azaindrocarbazole, diazaindrocarbazole, azaindenocarbazole and diazaindenocarbazole; Formula compounds; hexacyclic heterocyclic compounds such as carbazolocarbazole, benzindolocarbazole and benziindenocarbazole; and heptacyclic heterocyclic compounds such as dibenzindolocarbazole and dibenzindenocarbazole. ) from which two hydrogen atoms directly bonded to the atoms constituting the ring have been removed (hereinafter, a heterocyclic compound of n ^Z2 cyclic (n ^Z2 represents an integer of 2 or more)) A group in which two hydrogen atoms directly bonded to the atom are removed is also referred to as an "n ^Z2 cyclic divalent heterocyclic group"), and the group may have a substituent. The divalent heterocyclic group which is a condensed ring includes a group in which a plurality of the above-mentioned groups are bonded.
The divalent heterocyclic group that is a condensed ring is preferably a bicyclic, tricyclic, tetracyclic, pentacyclic, or hexacyclic divalent heterocyclic group, since the luminous efficiency of the light emitting device of this embodiment is better. a valent heterocyclic group, more preferably a bicyclic, tricyclic, tetracyclic or pentacyclic divalent heterocyclic group; a bicyclic or tricyclic divalent heterocyclic group; A tricyclic divalent heterocyclic group is particularly preferred, and these groups may have a substituent.
The divalent heterocyclic group which is a condensed ring is preferably azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, dibenzosilole, phenoxazine, or phenothiazine, since the light emitting device of this embodiment has better luminous efficiency. , 9,10-dihydroacridine, 5,10-dihydrophenazine, azaanthracene, diazaanthracene, azaphenanthrene or diazaphenanthrene, from which two hydrogen atoms directly bonded to atoms constituting the ring are removed, More preferably, from azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, dibenzosilole, phenoxazine, phenothiazine or 9,10-dihydroacridine, two hydrogen atoms directly bonded to atoms constituting the ring are removed. A group, more preferably a group represented by formula (AA-7) to formula (AA-22), particularly preferably a group represented by formula (AA-10) to formula (AA-22) These groups may have a substituent.

The examples and preferred ranges of substituents that the group represented by Z may have are the same as the examples and preferred ranges of substituents that the group represented by Ar ^Y1 described below may have.

The structural unit represented by formula (1) is preferably a structural unit represented by formula (X-4) to formula (X-7), since the light emitting element of this embodiment has better luminous efficiency. , more preferably structural units represented by formulas (X-4) to formula (X-6), still more preferably structural units represented by formula (X-4).

[In the formula, R ^X4 and R ^X5 are each independently a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or It represents a fluorine atom, and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of R ^X4s may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of R ^X5s may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. ]

R ^X4 and R ^X5 are preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, or a monovalent heterocyclic group, since the luminous efficiency of the light emitting element of this embodiment is more excellent. or a substituted amino group, more preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, particularly preferably a hydrogen atom, an alkyl group, or a cycloalkyl group or an aryl group, and these groups may further have a substituent.
Examples and preferred ranges of the aryl ^group , monovalent heterocyclic group, and substituted amino group in R ^X4 and ^R Examples and preferred ranges of the valent heterocyclic group and substituted amino group are the same.
Examples and preferred ranges of substituents that R ^X4 and R ^X5 may have are respectively the same as examples and preferred ranges of substituents that the group represented by Ar ^Y1 described below may have.

Examples of the structural unit represented by formula (1) include structural units represented by formulas (X1-7) to (X1-19).

The content of the structural unit represented by formula (1) contained in the polymer compound A may be within a range that allows the polymer compound A to function. The content of the structural unit represented by formula (1) contained in the polymer compound A is, for example, 0.01 to 100 mol% with respect to the total content of the structural units contained in the polymer compound A. The amount is preferably 0.05 to 90 mol%, more preferably 0.1 to 70 mol%, and still more preferably 0.2 to 50 mol%, since the luminous efficiency of the light emitting element of this embodiment is better. %, particularly preferably from 0.5 to 30 mol %, particularly preferably from 1 to 10 mol %. The polymer compound A may contain only one type of structural unit represented by formula (1), or may contain two or more types of structural units.

(Other constituent units)
The polymer compound A is at least one type selected from the group consisting of the structural unit represented by formula (X) and the structural unit represented by formula (Y), since the light emitting element of this embodiment has better luminous efficiency. It is preferable to further include a structural unit. That is, the polymer compound A has at least one kind of structural unit selected from the group consisting of the structural unit represented by the formula (X) and the structural unit represented by the formula (Y), and the structural unit represented by the formula (1). It is preferable that it is a polymeric compound containing a structural unit.
The polymer compound A includes at least one structural unit selected from the group consisting of the structural unit represented by formula (X) and the structural unit represented by formula (Y), and the structure represented by formula (1). unit, it is preferable that the structural unit represented by formula (1) is different from the structural unit represented by formula (X) and the structural unit represented by formula (Y).
The polymer compound A preferably further contains a structural unit represented by the formula (Y), since the light emitting element of this embodiment has more excellent luminous efficiency.
It is preferable that the polymer compound A further contains a structural unit represented by formula (X), since the hole transporting property of the polymer compound A is excellent and the luminous efficiency of the light emitting element of this embodiment is even more excellent. . The polymer compound A has excellent hole transport properties and the luminous efficiency of the light emitting element of this embodiment is even better. It is preferable to further include the structural unit represented.

When polymer compound A contains a structural unit represented by formula (Y), the content of the structural unit represented by formula (Y) may be within a range that allows the polymer compound A to function. . When polymer compound A contains a structural unit represented by formula (Y), the content of the structural unit represented by formula (Y) is relative to the total content of structural units contained in polymer compound A. For example, it is 1 to 99.99 mol%, and since the luminous efficiency of the light emitting element of this embodiment is more excellent, it is preferably 10 to 99.95 mol%, more preferably 30 to 99.9 mol%. It is more preferably 50 to 99.8 mol%, particularly preferably 70 to 99.5 mol%, particularly preferably 90 to 99 mol%.
The polymer compound A may contain only one type of structural unit represented by formula (Y), or may contain two or more types of structural units.

When polymer compound A contains a structural unit represented by formula (X), the content of the structural unit represented by formula (X) may be within a range that allows the polymer compound A to function. . When polymer compound A contains a structural unit represented by formula (X), the content of the structural unit represented by formula (X) is relative to the total content of structural units contained in polymer compound A. For example, it is 0.01 to 99.9 mol%, and the hole transporting property of the polymer compound A is excellent, and the luminous efficiency of the light emitting element of this embodiment is even more excellent, so it is preferably 0.05 to 99.9 mol%. 90 mol%, more preferably 0.1 to 70 mol%, even more preferably 0.2 to 50 mol%, particularly preferably 0.5 to 30 mol%, particularly preferably 1 to 70 mol%. It is 10 mol%.
The polymer compound A may contain only one type of structural unit represented by formula (X), or may contain two or more types of structural units.

When polymer compound A contains a structural unit represented by formula (X) and/or a structural unit represented by formula (Y), and a structural unit represented by formula (1), formula (X) The total content of the structural unit represented by , the structural unit represented by formula (Y), and the structural unit represented by formula (1) is within the range where the function as polymer compound A can be performed. good. When polymer compound A contains a structural unit represented by formula (X) and/or a structural unit represented by formula (Y), and a structural unit represented by formula (1), formula (X) The total content of the structural unit represented by , the structural unit represented by formula (Y), and the structural unit represented by formula (1) is the total content of the structural units contained in polymer compound A. On the other hand, it is, for example, 1 to 100 mol%, and the luminous efficiency of the light emitting element of this embodiment is more excellent, so it is preferably 10 to 100 mol%, more preferably 30 to 100 mol%, and even more preferably. is 50 to 100 mol%, particularly preferably 70 to 100 mol%, particularly preferably 90 to 100 mol%.

- The structural unit represented by formula (Y) The arylene group represented by Ar ^Y1 is preferably a phenylene group, naphthalenediyl group, anthracenediyl group, or phenanthrene group, since the light emitting element of this embodiment has better luminous efficiency. A diyl group, a dihydrophenanthrenediyl group, a fluorenediyl group, or a pyrenediyl group, more preferably a phenylene group, a phenanthrenediyl group, a dihydrophenanthrenediyl group, or a fluorenediyl group, and these groups have a substituent. You can leave it there.
The arylene group represented by Ar ^Y1 is preferably one of formulas (A-1) to (A-14), formula (A-19), or formula ( A-20), more preferably formula (A-1), formula (A-6), formula (A-7), formula (A-9) to formula (A-11) , formula (A-13) or formula (A-19), more preferably a group represented by formula (A-1), formula (A-7), formula (A-9) or formula (A-19). -19).

The divalent heterocyclic group represented by Ar ^Y1 is preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, or dibenzothiophene, since the light emitting element of this embodiment has better luminous efficiency. , phenoxazine, phenothiazine, 9,10-dihydroacridine or 5,10-dihydrophenazine from which two hydrogen atoms directly bonded to the atoms constituting the ring are removed, and more preferably pyridine, diazabenzene, triazine. , carbazole, dibenzofuran, dibenzothiophene, phenoxazine, or phenothiazine from which two hydrogen atoms directly bonded to the atoms constituting the ring are removed, and these groups may have a substituent.
The divalent heterocyclic group represented by Ar ^Y1 is preferably one of formulas (AA-1) to (AA-15) and formula (AA-18), since the luminous efficiency of the light emitting device of this embodiment is even more excellent. ) to a group represented by formula (AA-22), formula (AA-33) or formula (AA-34), more preferably a group represented by formula (AA-1) to formula (AA-6) or formula ( AA-10) to formula (AA-15) or formula (AA-18) to formula (AA-22), more preferably formula (AA-4), formula (AA-10), or formula (AA- 13), a group represented by the formula (AA-15), the formula (AA-18) or the formula (AA-20), particularly preferably a group represented by the formula (AA-4), the formula (AA-10) or the formula (AA-18) or a group represented by formula (AA-20).

In the divalent group represented by Ar ^Y1 in which at least one arylene group and at least one divalent heterocyclic group are directly bonded, the preferred ranges of the arylene group and the divalent heterocyclic group are as follows: The preferred ranges are the same as the arylene group and divalent heterocyclic group represented by Ar ^Y1 .
In Ar ^Y1 , "a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded" includes, for example, a group represented by the following formula, and these The group may have a substituent.

Ar ^Y1 is preferably an arylene group which may have a substituent, since the light emitting element of this embodiment has better luminous efficiency.

The substituent that the group represented by Ar ^Y1 may have is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, or an aryl group, since the light emitting element of this embodiment has better luminous efficiency. group, aryloxy group, monovalent heterocyclic group, substituted amino group, or fluorine atom, more preferably an alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, aryl group, monovalent heterocyclic group, or A substituted amino group, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, particularly preferably an alkyl group, a cycloalkyl group, or an aryl group; The group may further have a substituent.
The aryl group in the substituent that the group represented by Ar ^Y1 may have is preferably benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene, or fluorene, since the luminous efficiency of the light emitting element of this embodiment is more excellent. is a group from which one hydrogen atom directly bonded to an atom constituting a ring is removed, more preferably a group from which one hydrogen atom directly bonded to an atom constituting a ring is removed from benzene, phenanthrene, dihydrophenanthrene, or fluorene. More preferably, it is a phenyl group, and these groups may further have a substituent.
The monovalent heterocyclic group in the substituent that the group represented by Ar ^Y1 may have is preferably pyridine, diazabenzene, triazine, or azanaphthalene, since the luminous efficiency of the light emitting element of this embodiment is more excellent. , diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, phenoxazine, phenothiazine, 9,10-dihydroacridine or 5,10-dihydrophenazine, with one hydrogen atom directly bonded to the atom constituting the ring removed. More preferably, it is a group obtained by removing one hydrogen atom directly bonded to an atom constituting a ring from pyridine, diazabenzene, triazine, carbazole, dibenzofuran, dibenzothiophene, phenoxazine, or phenothiazine, and even more preferably pyridine. , diazabenzene or triazine from which one hydrogen atom directly bonded to the atom constituting the ring has been removed, and these groups may further have a substituent.
In the substituted amino group among the substituents that the group represented by Ar ^Y1 may have, the substituent that the amino group has is preferably an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and The group may further have a substituent. Examples and preferred ranges of the aryl group and monovalent heterocyclic group in the substituent of the amino group are the aryl group and monovalent heterocyclic group in the substituent that the group represented by Ar ^Y1 may have, respectively. The examples and preferred ranges of the groups are the same.

The substituent that the group represented by Ar ^Y1 may further include is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, or an aryloxy group. group, a monovalent heterocyclic group, a substituted amino group, or a fluorine atom, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, even more preferably an alkyl group, a substituted amino group, or a fluorine atom. group, cycloalkyl group, or aryl group, particularly preferably an alkyl group or cycloalkyl group, and these groups may further have a substituent, but it is preferable that they do not further have a substituent. .
Examples and preferred ranges ^of the aryl group, monovalent heterocyclic group, and substituted amino group in the substituent that the group represented by Ar Y1 may further include are Ar ^Y1 The examples and preferred ranges of the aryl group, monovalent heterocyclic group, and substituted amino group in the substituent that the group represented by may have are the same.

The structural unit represented by formula (Y) is preferably a structural unit represented by formula (Y-1) or formula (Y-2), since the light emitting element of this embodiment has better luminous efficiency. More preferably, it is a structural unit represented by formula (Y-2).

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

In formula (Y-1), at least one of R ^Y1 (preferably at least two of R ^Y1 ) is preferably an alkyl group or a cycloalkyl group, since the light emitting element of this embodiment has better luminous efficiency. group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a fluorine atom, more preferably an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group. It is a cyclic group or a substituted amino group, more preferably an alkyl group, a cycloalkyl group, or an aryl group, and particularly preferably an alkyl group, and these groups may have a substituent.

R ^Y2 is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, since the luminous efficiency of the light emitting element of this embodiment is more excellent. , more preferably an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group, and even more preferably an alkyl group, a cycloalkyl group, or an aryl group, and these groups have a substituent. You can.

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

In X ^Y1 , the combination of two R ^Y2s in the group represented by -C(R ^Y2 ) ₂ - is preferably such that both are an alkyl group or a cycloalkyl group, both are an aryl group, and both are a monovalent hetero cyclic group, or one is an alkyl group or cycloalkyl group and the other is an aryl group or a monovalent heterocyclic group, more preferably one is an alkyl group or cycloalkyl group and the other is an aryl group, and these groups may have a substituent. Two R ^Y2s may be bonded to each other to form a ring with the atoms to which they are bonded, and when R ^Y2 forms a ring, as a group represented by -C(R ^Y2 ) ₂ - is preferably a group represented by formula (Y-A1) to formula (Y-A5), more preferably a group represented by formula (Y-A4), and these groups have a substituent. You may do so.

In X ^Y1 , the combination of two R ^Y2s in the group represented by -C(R ^Y2 )=C(R ^Y2 )- is preferably such that both are an alkyl group or a cycloalkyl group, or one is an alkyl group. Alternatively, one is a cycloalkyl group and the other is an aryl group, and these groups may have a substituent.

In X ^Y1 , four R ^Y2s in the group represented by -C(R ^Y2 ) ₂ -C(R ^Y2 ) ₂ - are preferably an alkyl group or a substituent which may have a substituent. It is a cycloalkyl group which may have. A plurality of R ^Y2s may be bonded to each other to form a ring with the atoms to which they are bonded, and when R ^Y2 forms a ring, -C(R ^Y2 ) ₂ -C(R ^Y2 ) ₂ - The group represented by is preferably a group represented by formulas (Y-B1) to (Y-B5), more preferably a group represented by formula (Y-B3), and these groups are It may have a substituent.

[In the formula, R ^Y2 represents the same meaning as above. ]

X ^Y1 is preferably a group represented by -C(R ^Y2 ) ₂ - or -C(R ^Y2 ) ₂ -C(R ^Y2 ) ₂ -, since the luminous efficiency of the light emitting element of this embodiment is more excellent. More preferably, it is a group represented by -C( ^RY2 ) ₂ -.

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

- The structural units represented by formula (X) a ^X1 and ^a , more preferably an integer of 0 to 3, still more preferably an integer of 0 to 2, particularly preferably 0 or 1.

R ^X1 , R ^X2 , and R ^X3 are preferably an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group, and more preferably an aryl group, since the luminous efficiency of the light emitting element of this embodiment is more excellent. or a monovalent heterocyclic group, more preferably an aryl group, and these groups may have a substituent.
Examples and preferred ranges ^of the aryl group and monovalent heterocyclic group in R ^X1 , R ^X2 ^and R The examples and preferred ranges of the cyclic group are the same.

Examples and preferred ^ranges of the arylene group and divalent heterocyclic group in Ar ^X1 , ^Ar ^X2 , Ar ^X3 and Ar be.
Examples and preferred arylene groups and divalent heterocyclic groups in the divalent groups represented by Ar ^X2 and Ar ^X4 in which at least one arylene group and at least one divalent heterocyclic group are directly bonded The ranges are the same as the examples and preferred ranges of the arylene group and divalent heterocyclic group in Ar ^Y1 , respectively.
The divalent group in which at least one arylene group and at least one divalent heterocyclic group ^are directly bonded ^{in Ar X2} ^and Ar Examples include those similar to divalent groups directly bonded to a valent heterocyclic group.
Ar ^X1 , Ar ^X2 , Ar ^X3 and Ar ^X4 are preferably arylene groups which may have substituents, since the light emitting element of this embodiment has better luminous efficiency.

Examples and preferred ranges of substituents that the groups represented by Ar ^X1 ^to Ar ^X4 and ^R ^X1 to R Same as range.

As the structural unit represented by formula (X), structural units represented by formulas (X-1) to (X-3) are preferable because the luminous efficiency of the light emitting element of this embodiment is more excellent. .

[In the formula, R ^X4 represents the same meaning as above. ]

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

Examples of the polymer compound A include polymer compounds P-1 to P-4 shown in Table 1 below. Here, "other" structural units mean structural units other than the structural unit represented by formula (1), the structural unit represented by formula (Y), and the structural unit represented by formula (X). do.

[In Table 1, r', s', t' and u' represent the molar ratio (mol%) of each structural unit. r'+s'+t'+u'=100, and 70≦r'+s'+t'≦100. ]

The polymer compound A may be a block copolymer, a random copolymer, an alternating copolymer, a graft copolymer, or may have other forms, but it may be made by combining multiple types of raw material monomers. Preferably, it is a copolymer.

The number average molecular weight of the polymer compound A in terms of polystyrene is preferably 5×10 ³ to 1×10 ⁶ , more preferably 1×10 ⁴ to 5×10 ⁵ , even more preferably 2×10 ⁴ to It is 2×10 ⁵ . The weight average molecular weight of the polymer compound A in terms of polystyrene is preferably 1×10 ⁴ to 2×10 ⁶ , more preferably 2×10 ⁴ to 1×10 ⁶ , even more preferably 5×10 ⁴ to It is 5×10 ⁵ .

(Method for producing polymer compound A)
Polymer compound A can be produced using known polymerization methods such as those described in Chem. Rev., Vol. 109, pp. 897-1091 (2009), such as Suzuki reaction, Yamamoto reaction, Examples of polymerization methods include coupling reactions using transition metal catalysts such as Buchwald reaction, Stille reaction, Negishi reaction, and Kumada reaction.
In the above polymerization method, the monomers can be charged in one go by charging the entire amount of the monomers into the reaction system, or after charging a part of the monomers and reacting, the remaining monomers can be added in one go. Examples include a method of continuously or dividedly charging a monomer, a method of continuously or dividingly charging a monomer, and the like.
Examples of transition metal catalysts include palladium catalysts and nickel catalysts.
Post-treatment of the polymerization reaction can be carried out by known methods, such as removing water-soluble impurities by liquid separation, adding the reaction solution after the polymerization reaction to a lower alcohol such as methanol, filtering the precipitate, and then drying. Use these methods alone or in combination. When the purity of the polymer compound A is low, it can be purified by conventional methods such as recrystallization, reprecipitation, continuous extraction using a Soxhlet extractor, and column chromatography.

[Polymer compound B]
The polymer compound B is a polymer compound containing a structural unit represented by formula (2). It is preferable that the polymer compound A is a polymer compound that does not contain the structural unit represented by formula (1).

(Constituent unit represented by formula (2))
B ¹ is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a hydroxyalkyl group, a cycloalkoxy group, an aryl group, an aryloxy group, or a monovalent hetero group, since the luminous efficiency of the light emitting element of this embodiment is more excellent. A cyclic group or a substituted amino group, more preferably an alkyl group, a cycloalkyl group, an alkoxy group, a hydroxyalkyl group, a cycloalkoxy group, an aryl group, or an aryloxy group, and still more preferably an alkyl group or a cycloalkyl group. or an aryl group, particularly preferably an alkyl group or an aryl group, particularly preferably an alkyl group, and these groups may have a substituent.
Examples and preferred ranges of the aryl group, monovalent heterocyclic group, and substituted amino group in ^B1 are the aryl group, monovalent heterocyclic group, and the substituent that the group represented by Ar ^Y1 may have, respectively. and the examples and preferred ranges of substituted amino groups.
Examples of the hydroxyalkyl group for B ¹ include an alkyl group in which one of the hydrogen atoms is substituted with a hydroxy group.
The examples and preferred ranges of the substituents that B ¹ may have are the same as the examples and preferred ranges of the substituents that the group represented by Ar ^Y1 may have, respectively.

The repeating number (degree of polymerization) of the structural unit represented by formula (2) contained in the polymer compound B is usually an integer of 5 to 10,000, which is preferable since the light emitting element of this embodiment has better luminous efficiency. is an integer of 10 to 5,000, more preferably an integer of 20 to 2,000, more preferably an integer of 50 to 1,000.

s is usually an integer of 0 to 10, preferably an integer of 0 to 5, more preferably an integer of 0 to 2, still more preferably 0 or 1, and particularly preferably 0.

Examples of the structural unit represented by formula (2) include structural units represented by the following formula.

The content of the structural unit represented by formula (2) contained in the polymer compound B may be within a range that allows the polymer compound B to function. The content of the structural unit represented by formula (2) contained in the polymer compound B is, for example, 1 to 100 mol% with respect to the total content of the structural units contained in the polymer compound B, Since the luminous efficiency of the light emitting element of this embodiment is more excellent, it is preferably 10 to 100 mol%, more preferably 30 to 100 mol%, still more preferably 50 to 100 mol%, and particularly preferably 70 to 100 mol%. ~100 mol%, particularly preferably 90~100 mol%. Polymer compound B may contain only one type of structural unit represented by formula (2), or may contain two or more types of structural units.

Polymer compound B is available from Dow-Toray Industries, Shin-Etsu Chemical Co., Ltd., Bic-Chemie Japan Co., Ltd., etc. In addition, it can be produced using known polymerization methods described in, for example, Japanese Patent Publication No. 2011-505448, Japanese Patent Application Publication No. 2012-68417, and Japanese Patent Application Publication No. 2015-147930.

The polymer compound B may be a block copolymer, a random copolymer, an alternating copolymer, a graft copolymer, or may have other forms, and may be a copolymer of multiple types of raw material monomers. It may also be a copolymer.

The number average molecular weight of the polymer compound B in terms of polystyrene is preferably 1×10 ³ to 1×10 ⁶ , more preferably 2×10 ³ to 5×10 ⁵ , even more preferably 2×10 ³ to It is 2×10 ⁵ . The weight average molecular weight of the polymer compound B in terms of polystyrene is preferably 2×10 ³ to 2×10 ⁶ , more preferably 5×10 ³ to 1×10 ⁶ , even more preferably 5×10 ³ to It is 5×10 ⁵ .

[solvent]
The solvent contained in the composition of this embodiment (hereinafter also referred to as "ink solvent") dissolves or disperses polymer compound A and polymer compound B, and reacts with polymer compound A and polymer compound B. There is no particular limitation as long as it does not.
It is preferable to use the ink solvent alone because it facilitates the production of the composition of this embodiment. Moreover, since the luminous efficiency of the light emitting element of this embodiment is more excellent, it is preferable to use a mixture of two or more kinds of ink solvents.
Examples of ink solvents include chlorine solvents, aromatic hydrocarbon solvents, aromatic ether solvents, aliphatic hydrocarbon solvents, aliphatic ether solvents, alcohol solvents, ketone solvents, amide solvents, and esters. Preferably, chlorine-based solvents, aromatic hydrocarbon-based solvents, aromatic ether-based solvents, and aliphatic hydrocarbon-based solvents are used, since the luminous efficiency of the light-emitting element of this embodiment is more excellent. , aliphatic ether solvents, ketone solvents, amide solvents, or ester solvents, more preferably aromatic hydrocarbon solvents, aromatic ether solvents, aliphatic hydrocarbon solvents, and aliphatic ether solvents. , a ketone solvent or an ester solvent, more preferably an aromatic hydrocarbon solvent, an aromatic ether solvent, an aliphatic hydrocarbon solvent or an aliphatic ether solvent, particularly preferably an aromatic hydrocarbon solvent. type solvent or aromatic ether type solvent.

When two or more kinds of ink solvents are used, at least one of the ink solvents is preferably a chlorine-based solvent, an aromatic hydrocarbon-based solvent, or an aromatic ether, since the luminous efficiency of the light-emitting element of this embodiment is better. solvents, aliphatic hydrocarbon solvents, aliphatic ether solvents, ketone solvents, amide solvents, or ester solvents, and more preferably aromatic hydrocarbon solvents, aromatic ether solvents, and aliphatic carbonized solvents. Hydrogen solvent, aliphatic ether solvent, ketone solvent or ester solvent, more preferably aromatic hydrocarbon solvent, aromatic ether solvent, aliphatic hydrocarbon solvent or aliphatic ether solvent. Among them, aromatic hydrocarbon solvents or aromatic ether solvents are particularly preferred.
When two or more kinds of ink solvents are used, at least two of the ink solvents are preferably chlorine-based solvents, aromatic hydrocarbon-based solvents, or aromatic ethers, since the luminous efficiency of the light-emitting element of this embodiment is better. At least two types selected from the group consisting of solvents, aliphatic hydrocarbon solvents, aliphatic ether solvents, ketone solvents, amide solvents, and ester solvents, more preferably aromatic hydrocarbon solvents, At least two types selected from the group consisting of aromatic ether solvents, aliphatic hydrocarbon solvents, aliphatic ether solvents, ketone solvents, and ester solvents, more preferably aromatic hydrocarbon solvents, aromatic At least two types selected from the group consisting of group ether solvents, aliphatic hydrocarbon solvents, and aliphatic ether solvents, and particularly preferably selected from the group consisting of aromatic hydrocarbon solvents and aromatic ether solvents. There are at least two types.
When two or more kinds of ink solvents are used, a combination of at least two of the ink solvents is preferably an aromatic hydrocarbon solvent and an aromatic ether solvent, since the light emitting efficiency of the light emitting element of this embodiment is better. and one of aromatic hydrocarbon solvents, aromatic ether solvents, aliphatic hydrocarbon solvents, aliphatic ether solvents, ketone solvents, amide solvents, and ester solvents. More preferably, one of aromatic hydrocarbon solvents and aromatic ether solvents, and aromatic hydrocarbon solvents, aromatic ether solvents, aliphatic hydrocarbon solvents, aliphatic A combination with one of an ether solvent, a ketone solvent, and an ester solvent, more preferably a combination of two aromatic hydrocarbon solvents, a combination of two aromatic ether solvents, or an aromatic It is a combination of a group hydrocarbon solvent and an aromatic ether solvent.

Examples of chlorinated solvents include dichloroethane, trichloroethane, chlorobenzene, and dichlorobenzene.
Examples of aromatic hydrocarbon solvents include toluene, xylene, ethylbenzene, trimethylbenzene, tetramethylbenzene, propylbenzene, butylbenzene, pentylbenzene, cyclopentylbenzene, methylcyclopentylbenzene, hexylbenzene, cyclohexylbenzene, methylcyclohexylbenzene, Mention may be made of heptylbenzene, cycloheptylbenzene, methylcycloheptylbenzene, octylbenzene, nonylbenzene, decylbenzene, undecylbenzene, dodecylbenzene, tridecylbenzene, tetradecylbenzene and tetralin.
Examples of aromatic ether solvents include anisole, dimethoxybenzene, trimethoxybenzene, ethoxybenzene, propoxybenzene, butoxybenzene, methylpropoxybenzene, butoxybenzene, methoxytoluene, ethoxytoluene, methoxynaphthalene, ethoxynaphthalene, and phenoxytoluene. can be mentioned.
Examples of aliphatic hydrocarbon solvents include cyclohexane, methylcyclohexane, pentane, hexane, heptane, octane, nonane, decane, dodecane, and bicyclohexyl.
Examples of the aliphatic ether solvent include diisopropyl ether, methyl butyl ether, dibutyl ether, tetrahydrofuran, dioxane, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, and triethylene glycol dimethyl ether.
Examples of alcoholic solvents include ethanol, propanol, butanol, pentanol, cyclopentanol, hexanol, cyclohexanol, heptanol, octanol, benzyl alcohol, phenylethanol, ethylene glycol, propylene glycol, diethylene glycol monomethyl ether, propanediol, and glycerin. can be mentioned.
Examples of ketone solvents include acetone, methyl ethyl ketone, methyl butyl ketone, dibutyl ketone, cyclohexanone, methylcyclohexanone, hexanone, octanone, nonanone, phenylacetone, acetylacetone, acetonylacetone, acetophenone, methylnaphthyl ketone, and isophorone.
Examples of the amide solvent include N-methylpyrrolidone, N-ethylpyrrolidone, N,N-dimethylacetamide, N,N-dimethylformamide, and 1,3-dimethyl-2-imidazolidinone.
Examples of ester solvents include butyl acetate, ethyl acetate, propyl acetate, pentyl acetate, ethyl propionate, ethyl butyrate, propylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate. , ethyl-3-ethoxypyrropionate, 3-methoxybutyl acetate, 3-methyl-3-methoxybutyl acetate, propyl formate, propyl lactate, ethyl phenylacetate, ethyl benzoate, β-propiolactone, γ-butyrolactone, and δ-valerolactone.
Examples of carbonate-based solvents include dimethyl carbonate, diethyl carbonate, ethylene carbonate, and propylene carbonate.

In the composition of the present embodiment, at least one of the ink solvents has a boiling point of usually 40° C. to 500° C. at 1 atm, which is preferable because the luminous efficiency of the light emitting element of the present embodiment is more excellent. The temperature is 60°C to 450°C, more preferably 80°C to 400°C, even more preferably 100°C to 300°C.
When two or more kinds of ink solvents are used, at least one of the ink solvents has a boiling point at 1 atm of preferably 100° C. to 450° C., more preferably is 150°C to 400°C, more preferably 200°C to 300°C.
When two or more types of ink solvents are used, the luminous efficiency of the light emitting element of this embodiment is further improved. It is preferable that the boiling point of the species at 1 atm is 200°C or more and 450°C or less, and the boiling point of at least one of the species is 80°C or more and 195°C or less at 1 atm, and the boiling point of at least one of the species is 210°C or less at 1 atm. More preferably, the boiling point at 1 atm of at least one is 100°C or more and 190°C or less, and the boiling point of at least one at 1 atm is 220°C or more and 300°C or less. More preferred.
When two or more types of ink solvents are used, the content of the ink solvent with the lowest content among the ink solvents is such that, when the total content of the ink solvents is 100 parts by mass, the luminous efficiency of the light emitting element of this embodiment is The amount is preferably 1 to 50 parts by weight, more preferably 5 to 45 parts by weight, and still more preferably 10 to 40 parts by weight.
When two or more types of ink solvents are used, the luminous efficiency of the light emitting element of this embodiment is better, so the boiling point at 1 atm of the ink solvent with the lowest content among the ink solvents is preferably 60°C or more and less than 200°C. The temperature is more preferably 80°C or more and 195°C or less, and even more preferably 100°C or more and 190°C or less.
When two or more kinds of ink solvents are used, the content of the ink solvent with the highest content among the ink solvents is such that, when the total content of the ink solvents is 100 parts by mass, the luminous efficiency of the light emitting element of this embodiment is The amount is preferably 50 to 99 parts by weight, more preferably 55 to 95 parts by weight, and still more preferably 60 to 90 parts by weight.
When two or more types of ink solvents are used, the luminous efficiency of the light emitting element of this embodiment is better, so the boiling point at 1 atm of the ink solvent with the largest content among the ink solvents is preferably 200°C or more and 450°C or less. The temperature is more preferably 210°C or more and 400°C or less, and even more preferably 220°C or more and 300°C or less.
When two or more types of ink solvents are used, the number of types of ink solvents is usually 2 to 20 types, which facilitates the production of the composition of this embodiment, and increases the luminous efficiency of the light emitting element of this embodiment. Since they are more excellent, preferably 2 to 10 types, more preferably 2 to 5 types, still more preferably 2 or 3 types, particularly preferably 2 types.
When two or more kinds of ink solvents are used, it is sufficient that the mixed solvent is liquid at 25° C. and 1 atm.

[Other ingredients]
The composition of this embodiment is selected from the group consisting of a polymer compound A, a polymer compound B, a hole transport material, a hole injection material, an electron transport material, an electron injection material, a luminescent material, and an antioxidant. The composition may contain at least one type. However, the hole transport material, hole injection material, electron transport material, electron injection material, and light emitting material are different from polymer compound A and polymer compound B.

(hole transport material)
Hole transport materials are classified into low molecular weight compounds and high molecular weight compounds. The hole transport material may have a crosslinking group.
Examples of low-molecular compounds include triphenylamine and its derivatives, N,N'-di-1-naphthyl-N,N'-diphenylbenzidine (α-NPD), and N,N'-diphenyl-N, Examples include aromatic amine compounds such as N'-di(m-tolyl)benzidine (TPD).
Examples of the polymer compound include polyvinylcarbazole and derivatives thereof; polyarylene having an aromatic amine structure in the side chain or main chain and derivatives thereof. The polymer compound may be a compound to which an electron-accepting site is bonded, such as fullerene, tetrafluorotetracyanoquinodimethane, tetracyanoethylene, and trinitrofluorenone.
In the composition of the present embodiment, when a hole transporting material is included, the content of the hole transporting material is usually, when the total content of polymer compound A and polymer compound B is 100 parts by mass. The amount is 1 to 10,000 parts by mass.
The hole transport materials may be used alone or in combination of two or more.

(electron transport material)
Electron transport materials are classified into low molecular compounds and high molecular compounds. The electron transport material may have a crosslinking group.
Examples of low-molecular compounds include metal complexes with 8-hydroxyquinoline as a ligand, oxadiazole, anthraquinodimethane, benzoquinone, naphthoquinone, anthraquinone, tetracyanoanthraquinodimethane, fluorenone, diphenyldicyanoethylene, and diphenoquinone. , and derivatives thereof.
Examples of the polymer compound include polyphenylene, polyfluorene, and derivatives thereof. The polymer compound may be doped with metal.
In the composition of the present embodiment, when an electron transporting material is included, the content of the electron transporting material is usually 1 to 1 when the total content of polymer compound A and polymer compound B is 100 parts by mass. It is 10,000 parts by mass.
The electron transport materials may be used alone or in combination of two or more.

(Hole injection material and electron injection material)
Hole-injecting materials and electron-injecting materials are classified into low-molecular compounds and high-molecular compounds, respectively. The hole injection material and the electron injection material may have a crosslinking group.
Examples of low-molecular compounds include metal phthalocyanines such as copper phthalocyanine; carbon; metal oxides such as molybdenum and tungsten; and metal fluorides such as lithium fluoride, sodium fluoride, cesium fluoride, and potassium fluoride.
Examples of polymeric compounds include polyaniline, polythiophene, polypyrrole, polyphenylene vinylene, polythienylene vinylene, polyquinoline, polyquinoxaline, and derivatives thereof; conductive polymers containing an aromatic amine structure in the main chain or side chain. Polymers can be mentioned.
In the composition of this embodiment, when a hole injection material and/or an electron injection material are included, the contents of the hole injection material and the electron injection material are the total of the polymer compound A and the polymer compound B, respectively. When the content is 100 parts by mass, it is usually 1 to 10,000 parts by mass.
The hole injection material and the electron injection material may be used alone or in combination of two or more.

- Ion doping The hole injection material or electron injection material may be doped with ions. For example, when the hole injection material or electron injection material contains a conductive polymer, the electrical conductivity of the conductive polymer is preferably 1×10 ⁻⁵ S/cm to 1×10 ³ S/cm. In order to keep the electrical conductivity of the conductive polymer within this range, the conductive polymer can be doped with an appropriate amount of ions.
The types of ions to be doped into the hole injection material or electron injection material include, for example, an anion in the case of a hole injection material, and a cation in the case of an electron injection material. Examples of the anion include polystyrene sulfonate ion, alkylbenzene sulfonate ion, and camphor sulfonate ion. Examples of cations include lithium ions, sodium ions, potassium ions, and tetrabutylammonium ions.
The ions to be doped may be used singly or in combination of two or more.

(Light-emitting material)
Luminescent materials are classified into low molecular compounds and high molecular compounds. The luminescent material may have a crosslinking group.
Examples of the low-molecular compound include naphthalene and its derivatives, anthracene and its derivatives, perylene and its derivatives, and phosphorescent compounds having iridium, platinum, or europium as the central metal.
Examples of the polymer compound include a polymer compound containing a structural unit represented by formula (Y) and/or a structural unit represented by formula (X).

Examples of the phosphorescent compound include the following metal complexes.

In the composition of the present embodiment, when a luminescent material is included, the content of the luminescent material is usually 1 to 10,000 parts by mass when the total content of polymer compound A and polymer compound B is 100 parts by mass. Department.
The luminescent materials may be used alone or in combination of two or more.

(Antioxidant)
The antioxidant may be any compound as long as it is soluble in the same solvent as polymer compound A and polymer compound B and does not inhibit luminescence and charge transport. For example, phenolic antioxidants and phosphorus antioxidants may be used. Can be mentioned.
In the composition of the present embodiment, when an antioxidant is included, the content of the antioxidant is usually 0.001 to 10 parts by mass when polymer compound A and polymer compound B are 100 parts by mass. It is.
The antioxidants may be used alone or in combination of two or more.

<Membrane>
The film can be formed using the composition of this embodiment, for example, by spin coating, casting, microgravure coating, gravure coating, bar coating, roll coating, wire bar coating, dip coating, or spray coating. It can be produced by a wet method such as a method, a screen printing method, a flexo printing method, an offset printing method, an inkjet printing method, a capillary coating method, a nozzle coating method, or the like.
When producing a film by a wet method using the composition of this embodiment, the ink solvent is removed as necessary. Examples of methods for removing the ink solvent include natural drying, vacuum drying, and heat drying, and preferably natural drying or vacuum drying. The drying temperature is usually 0°C to 300°C, preferably 5°C to 150°C, more preferably 10°C to 75°C, even more preferably 15°C to 40°C.
The viscosity of the composition of the present embodiment may be adjusted depending on the type of wet method, but when applied to a printing method such as an inkjet printing method in which the solution passes through a discharge device, clogging during discharge and flight deflection may occur. Since this is difficult to occur, the temperature is preferably 1 to 50 mPa·s, more preferably 1 to 20 mPa·s at 25°C.
The film is suitable as a light emitting layer, a hole transport layer or a hole injection layer in a light emitting device.
The thickness of the film is typically 1 nm to 1 μm.

<Method for manufacturing light emitting device>
A method for manufacturing a light emitting device according to the present embodiment is a method for manufacturing a light emitting device having an anode, a cathode, and one or more organic layers provided between the anode and the cathode. This is a method for manufacturing a light emitting device, including a step of forming at least one layer using the composition of this embodiment by a wet method.
The light emitting element of this embodiment is a light emitting element having at least one organic layer formed by a wet method using the composition of this embodiment.
The structure of the light emitting element of this embodiment includes, for example, an electrode consisting of an anode and a cathode, and at least one organic layer formed by a wet method using the composition of this embodiment provided between the electrodes. have
In the light emitting element of this embodiment, the wet method includes the wet method described in the section of <Film> above.
In the step of forming an organic layer by a wet method using the composition of this embodiment, the ink solvent is removed as necessary. Examples of the method for removing the ink solvent include the method for removing the ink solvent described in the section <Membrane> above.

[Layer structure]
The organic layer included in a light emitting element is usually one or more of a light emitting layer, a hole transport layer, a hole injection layer, an electron transport layer, and an electron injection layer. The at least one organic layer formed by a wet method using the composition of this embodiment is usually one or more layers of a light emitting layer, a hole transport layer, a hole injection layer, an electron transport layer, and an electron injection layer. It is preferably a light emitting layer, a hole transport layer or a hole injection layer, and more preferably a light emitting layer. These layers each include a luminescent material, a hole transport material, a hole injection material, an electron transport material, and an electron injection material. These layers are prepared by dissolving a luminescent material, a hole transporting material, a hole injection material, an electron transporting material, and an electron injection material in the above-mentioned ink solvent, preparing a composition, and using it to prepare the above-mentioned film. It can be formed using the same method as .

A light emitting element has a light emitting layer between an anode and a cathode. From the viewpoint of hole injection and hole transport properties, the light emitting device of this embodiment preferably has at least one layer of a hole injection layer and a hole transport layer between the anode and the light emitting layer, From the viewpoint of electron injection properties and electron transport properties, it is preferable to have at least one layer of an electron injection layer and an electron transport layer between the cathode and the light emitting layer.

In addition to the composition of this embodiment, the hole transport layer, electron transport layer, light emitting layer, hole injection layer, and electron injection layer may each include the hole transport material, electron transport material, light emitting material, or hole transport material described above. It can be formed using an injection material, an electron injection material, or the like.

The material for the hole transport layer, the material for the electron transport layer, and the material for the emissive layer are based on the solvent used when forming the hole transport layer, the electron transport layer, and the layer adjacent to the emissive layer, respectively, in the production of the light emitting device. When dissolved, it is preferable that the material has a crosslinking group in order to avoid dissolving the material in the solvent. After each layer is formed using a material having a crosslinking group, the layer can be made insolubilized by crosslinking the crosslinking group.

In the method for manufacturing a light emitting device of the present embodiment, the method for forming each layer such as a light emitting layer, a hole transport layer, an electron transport layer, a hole injection layer, and an electron injection layer includes, for example, vacuum Examples include dry methods such as a vapor deposition method, and wet methods. When using a polymer compound, for example, a wet method may be used.

In the light emitting device of this embodiment, each of the anode, hole injection layer, hole transport layer, light emitting layer, electron transport layer, electron injection layer, and cathode may be provided with two or more layers as necessary. . When a plurality of anodes, hole injection layers, hole transport layers, light emitting layers, electron transport layers, electron injection layers and cathodes are present, they may be the same or different.
In the light emitting device of this embodiment, the thickness of the anode, hole injection layer, hole transport layer, light emitting layer, electron transport layer, electron injection layer and cathode is usually 1 nm to 1 μm, preferably 2 nm. ~500 nm, more preferably 5 nm ~ 150 nm.
In the light emitting device of this embodiment, the order, number, and thickness of the layers to be laminated may be adjusted in consideration of the brightness life, driving voltage, and luminous efficiency of the light emitting device.

[Substrate/electrode]
The substrate in the light emitting element may be any substrate as long as it is capable of forming an electrode and is not chemically changed during the formation of an organic layer, and is, for example, a substrate made of a material such as glass, plastic, or silicon. In the case of an opaque substrate, it is preferred that the electrode furthest from the substrate be transparent or translucent.
Examples of the material for the anode include conductive metal oxides and translucent metals, preferably indium oxide, zinc oxide, tin oxide; indium tin oxide (ITO), indium zinc oxide, etc. conductive compounds; silver-palladium-copper composite (APC); NESA, gold, platinum, silver, and copper.
Examples of the cathode material include metals such as lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, aluminum, zinc, and indium; alloys of two or more of these; and one of them. Alloys of at least one species selected from the group consisting of silver, copper, manganese, titanium, cobalt, nickel, tungsten, and tin; and graphite and graphite intercalation compounds. Examples of the alloy include magnesium-silver alloy, magnesium-indium alloy, magnesium-aluminum alloy, indium-silver alloy, lithium-aluminum alloy, lithium-magnesium alloy, lithium-indium alloy, and calcium-aluminum alloy.
The anode and the cathode may each have a laminated structure of two or more layers.

The light emitting device of this embodiment can be manufactured, for example, by sequentially stacking each layer on a substrate. Specifically, an anode is provided on a substrate, a hole injection layer, a hole transport layer, etc. are provided on the anode, a light emitting layer is provided on top of the anode, and an electron transport layer, an electron injection layer, etc. are provided on top of the anode. A light emitting device can be manufactured by providing a layer and further laminating a cathode thereon. Another manufacturing method is to provide a cathode on a substrate, provide layers such as an electron injection layer, an electron transport layer, a light emitting layer, a hole transport layer, and a hole injection layer on top of the cathode, and then provide an anode on top of the cathode. A light emitting device can be manufactured by laminating the layers. Furthermore, as another manufacturing method, it can be manufactured by joining an anode or an anode side base material in which each layer is laminated on the anode and a cathode or a cathode side base material in which each layer is laminated on the cathode so that they face each other. can.

[Application]
The light emitting element of this embodiment is suitable as a light source for backlight of a liquid crystal display device, a light source for illumination, an organic EL lighting, a display device (for example, an organic EL display and an organic EL television) for computers, televisions, mobile terminals, etc. It can be used for.

Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples.

In the examples, the number average molecular weight (Mn) in terms of polystyrene and the weight average molecular weight (Mw) in terms of polystyrene of the polymer compound were determined by the following size exclusion chromatography (SEC) using tetrahydrofuran as the mobile phase. . The measurement conditions for SEC are as follows.

The polymer compound to be measured was dissolved in tetrahydrofuran at a concentration of about 0.05% by mass, and 10 μL was injected into SEC. The mobile phase was run at a flow rate of 2.0 mL/min. PLgel MIXED-B (manufactured by Polymer Laboratories) was used as the column. A UV-VIS detector (manufactured by Shimadzu Corporation, trade name: SPD-10Avp) was used as a detector.

<Synthesis Example 1> Synthesis of Compounds M1 to M15 Compound M1, Compound M2, and Compound M7 were synthesized according to the method described in WO 2002/045184.
Compound M3 was synthesized according to the method described in WO 2005/052027.
Compound M4 was synthesized according to the method described in International Publication No. 2012/086671.
Compound M5 and compound M12 were synthesized according to the method described in JP-A-2012-144722.
Compound M6 was synthesized according to the method described in WO 2005/049546.
Compound M8 was synthesized according to the method described in JP-A-2004-143419.
Compound M9 was synthesized according to the method described in JP-A-2011-174062.
Compound M10 was synthesized according to the method described in JP-A-2008-106241.
Compound M11 was synthesized according to the method described in International Publication No. 2012/133256.
Compound M13 was synthesized according to the method described in International Publication No. 2014/157016.
Compound M14 was synthesized according to the method described in WO 2008/143272.
Compound M15 was synthesized according to the method described in WO 2004/060970.

<Synthesis Example 2> Synthesis of Polymer Compound 1 Polymer Compound 1 was synthesized using Compound M1, Compound M2, and Compound M3 according to the method described in International Publication No. 2011/049241. Mn of polymer compound 1 was 8.9×10 ⁴ and Mw was 4.2×10 ⁵ .
In the polymer compound 1, the number of structural units derived from compound M1, structural units derived from compound M2, and structural units derived from compound M3 is 50: It is a copolymer composed of a molar ratio of 42.5:7.5.

<Synthesis Example 3> Synthesis of Polymer Compound 2 Polymer Compound 2 was synthesized using Compound M4, Compound M1, Compound M5, and Compound M6 according to the method described in International Publication No. 2011/081065. The Mn of polymer compound 2 was 1.6×10 ⁵ and the Mw was 4.9×10 ⁵ .
According to the theoretical value determined from the amount of raw materials, polymer compound 2 consists of structural units derived from compound M4, structural units derived from compound M1, structural units derived from compound M5, and structural units derived from compound M6. It is a copolymer in which the structural units to be derived are constituted in a molar ratio of 36:14:44:6.

<Synthesis Example 4> Synthesis of Polymer Compound 3 Polymer Compound 3 was synthesized using Compound M4, Compound M7, and Compound M8 according to the method described in JP-A-2012-216815. Mn of polymer compound 3 was 1.0×10 ⁵ and Mw was 2.6×10 ⁵ .
According to the theoretical value obtained from the amount of the raw materials to be charged, the polymer compound 3 has a composition unit derived from compound M4, a composition unit derived from compound M7, and a composition unit derived from compound M8 of 50: It is a copolymer composed of a molar ratio of 45:5.

<Synthesis Example 5> Synthesis of Polymer Compound 4 Polymer Compound 4 was synthesized using Compound M1 and Compound M2 according to the method described in JP-A-2012-36381. The Mn of polymer compound 4 was 8.1×10 ⁴ and the Mw was 3.4×10 ⁵ .
According to the theoretical value obtained from the amount of raw materials, polymer compound 4 is a copolymer composed of structural units derived from compound M1 and structural units derived from compound M2 in a molar ratio of 50:50. It is a combination.

<Synthesis Example 6> Synthesis of Polymer Compound 5 Polymer Compound 5 was synthesized using Compound M9, Compound M6, Compound M7, and Compound M10 according to the method described in JP-A-2012-144722. The Mn of polymer compound 5 was 7.8×10 ⁴ and the Mw was 2.6×10 ⁵ .
According to the theoretical value determined from the amount of raw materials, polymer compound 5 consists of a structural unit derived from compound M9, a structural unit derived from compound M6, a structural unit derived from compound M7, and a structural unit derived from compound M10. The derived structural units are a copolymer constituted in a molar ratio of 50:30:12.5:7.5.

<Synthesis Example 7> Synthesis of Polymer Compound 6 Polymer Compound 6 was synthesized using Compound M11, Compound M12, and Compound M13 according to the method described in International Publication No. 2012/133256. The Mn of polymer compound 6 was 8.1×10 ⁴ and the Mw was 2.4×10 ⁵ .
In the polymer compound 6, according to the theoretical value determined from the amount of raw materials, the number of structural units derived from compound M11, structural units derived from compound M12, and structural units derived from compound M13 is 50: It is a copolymer composed of a molar ratio of 45:5.

<Synthesis Example 8> Synthesis of Polymer Compound 7 Polymer Compound 7 was prepared using Compound M4, Compound M1, Compound M5, Compound M8, Compound M14, and Compound M15 according to the method described in JP-A No. 2015-35600. Synthesized. Mn of polymer compound 7 was 9.1×10 ⁴ and Mw was 2.3×10 ⁵ . According to the theoretical value determined from the amount of raw materials, polymer compound 7 consists of a structural unit derived from compound M4, a structural unit derived from compound M1, a structural unit derived from compound M5, and a structural unit derived from compound M8. A copolymer composed of a structural unit derived from compound M14, a structural unit derived from compound M15, and a structural unit derived from compound M15 in a molar ratio of 36:14:41:5:3:1. be.

<Comparative Example CD1> Production and evaluation of light emitting device CD1 (formation of anode and hole injection layer)
An anode was formed by attaching an ITO film with a thickness of 45 nm to a glass substrate by sputtering. On the anode, a hole injection material ND-3202 (manufactured by Nissan Chemical Industries, Ltd.) was formed into a film with a thickness of 35 nm by spin coating. The substrate on which the hole injection layer was laminated was heated on a hot plate at 50° C. for 3 minutes in an air atmosphere, and then further heated at 230° C. for 15 minutes to form a hole injection layer.

(Formation of hole transport layer)
Add polymer compound 1 to the amount of organic solvent 1 in a solvent containing cyclohexylbenzene and xylene in a mass ratio of 61.8:38.2 (hereinafter also referred to as "organic solvent 1"). It was dissolved at a concentration of 0.6% by mass. Using the obtained solution, a film with a thickness of 20 nm was formed by spin coating on the hole injection layer, and a positive injection layer was formed by heating it on a hot plate at 200°C for 30 minutes in a nitrogen gas atmosphere. A pore transport layer was formed.

(Formation of light emitting layer)
Polymer compound 2 was dissolved in organic solvent 1 at a concentration of 0.9% by mass based on the amount of organic solvent 1. Using the obtained solution, a film with a thickness of 60 nm was formed by spin coating on the hole transport layer, and the film was heated at 180°C for 10 minutes on a hot plate in a nitrogen gas atmosphere to emit light. formed a layer.

(Formation of electron injection layer and cathode)
After reducing the pressure of the substrate on which the light-emitting layer has been formed to 1×10 ⁻⁴ Pa or less in a vapor deposition machine, sodium fluoride, which is an electron injection material, is vapor-deposited to a thickness of 4 nm on the light-emitting layer to form an electron injection layer. Next, aluminum was deposited to a thickness of about 80 nm on the electron injection layer to form a cathode. After the vapor deposition, the light emitting element CD1 was produced by sealing using a glass substrate.

(Evaluation of light emitting device)
EL light emission was observed by applying a voltage to the light emitting element CD1. The luminous efficiency of the light emitting element CD1 at 1000 cd/m ² was 3.9 cd/A.

<Example D1> Production and evaluation of light emitting element D1 In place of "organic solvent 1" in Comparative Example CD1 (formation of light emitting layer), "KF-96 1000cs (Shin-Etsu Chemical Co., Ltd.), which is a silicone oil, was added to organic solvent 1. Manufactured by Kogyo Co., Ltd., a polymer compound B) having a structural unit represented by formula (2) (in the formula, B ¹ is a methyl group and s is 0) and has a degree of polymerization of 300 to 400. Light-emitting element D1 was produced in the same manner as Comparative Example CD1, except that a solvent mixed at a concentration of 10 mass ppm with respect to the amount of organic solvent 1 was used.
EL light emission was observed by applying a voltage to the light emitting element D1. The luminous efficiency of the light emitting element D1 at 1000 cd/m ² was 4.5 cd/A.

<Example D2> Preparation and evaluation of light-emitting element D2 In place of "organic solvent 1" in Comparative example CD1 (formation of light-emitting layer), "KF-96 1000cs (manufactured by Shin-Etsu Chemical Co., Ltd.) was added to organic solvent 1. Light-emitting element D2 was produced in the same manner as Comparative Example CD1, except that a "solvent mixed with the following at a concentration of 100 mass ppm relative to the amount of organic solvent 1" was used.
EL light emission was observed by applying a voltage to the light emitting element D2. The luminous efficiency of the light emitting element D2 at 1000 cd/m ² was 4.8 cd/A.

<Example D3> Production and evaluation of light-emitting element D3 In place of "organic solvent 1" in Comparative Example CD1 (formation of light-emitting layer), KF-96 1000cs (manufactured by Shin-Etsu Chemical Co., Ltd.) was added to "organic solvent 1". Light-emitting element D3 was produced in the same manner as Comparative Example CD1, except that a "solvent mixed with the following at a concentration of 1000 ppm by mass based on the amount of organic solvent 1" was used.
EL light emission was observed by applying a voltage to the light emitting element D3. The luminous efficiency of the light emitting element D3 at 1000 cd/m ² was 4.2 cd/A.

Table 2 shows the results of Comparative Example CD1 and Examples D1, D2, and D3.

<Comparative Example CD2> Fabrication and Evaluation of Light Emitting Device CD2 The same procedure as Comparative Example CD1 was performed except that “polymer compound 3” was used instead of “polymer compound 2” in (formation of the light emitting layer) of comparative example CD1. A light emitting device CD2 was produced in the same manner.
EL light emission was observed by applying a voltage to the light emitting element CD2. The luminous efficiency of the light emitting element CD2 at 1000 cd/m ² was 3.8 cd/A.

<Comparative Example CD3> Preparation and evaluation of light emitting device CD3 Same as Example D1 except that "polymer compound 3" was used instead of "polymer compound 2" in (formation of light emitting layer) of example D1. A light emitting device CD3 was produced in the same manner.
EL light emission was observed by applying a voltage to the light emitting element CD3. The luminous efficiency of the light emitting element CD3 at 1000 cd/m ² was 3.0 cd/A.

<Comparative Example CD4> Production and evaluation of light emitting device CD4 Same as Example D2 except that "polymer compound 3" was used instead of "polymer compound 2" in (formation of light emitting layer) of example D2. A light emitting device CD4 was produced in the same manner.
EL light emission was observed by applying a voltage to the light emitting element CD4. The luminous efficiency of the light emitting element CD4 at 1000 cd/m ² was 2.9 cd/A.

<Comparative Example CD5> Production and evaluation of light emitting device CD5 Same as Example D3 except that "polymer compound 3" was used instead of "polymer compound 2" in (formation of light emitting layer) of example D3. A light emitting device CD5 was produced in the same manner.
EL light emission was observed by applying a voltage to the light emitting element CD5. The luminous efficiency of the light emitting element CD5 at 1000 cd/m ² was 2.6 cd/A.

The results of Comparative Examples CD2, CD3, CD4, and CD5 are shown in Table 3.

<Comparative Example CD6> Fabrication and Evaluation of Light-emitting Element CD6 Comparative Example CD1 and Comparative Example CD1 except that “Polymer Compound 4” was used instead of “Polymer Compound 2” in (formation of the light-emitting layer) of Comparative Example CD1. A light emitting device CD6 was produced in the same manner.
EL light emission was observed by applying a voltage to the light emitting element CD6. The luminous efficiency of the light emitting element CD6 at 1000 cd/m ² was 0.2 cd/A.

<Comparative Example CD7> Preparation and evaluation of light emitting device CD7 Same as Example D1 except that "polymer compound 4" was used instead of "polymer compound 2" in (formation of light emitting layer) of example D1. A light emitting device CD7 was produced in the same manner.
EL light emission was observed by applying a voltage to the light emitting element CD7. The luminous efficiency of the light emitting element CD7 at 1000 cd/m ² was 0.2 cd/A.

<Comparative Example CD8> Preparation and evaluation of light emitting device CD8 Same as Example D2 except that "polymer compound 4" was used instead of "polymer compound 2" in (formation of light emitting layer) of example D2. A light emitting device CD8 was produced in the same manner.
EL light emission was observed by applying a voltage to the light emitting element CD8. The luminous efficiency of the light emitting element CD8 at 1000 cd/m ² was 0.2 cd/A.

<Comparative Example CD9> Preparation and evaluation of light emitting device CD9 Same as Example D3 except that "polymer compound 4" was used instead of "polymer compound 2" in (formation of light emitting layer) of example D3. A light emitting device CD9 was produced in the same manner.
EL light emission was observed by applying a voltage to the light emitting element CD9. The luminous efficiency of the light emitting element CD9 at 1000 cd/m ² was 0.2 cd/A.

The results of Comparative Examples CD6, CD7, CD8 and CD9 are shown in Table 4.

<Comparative Example CD10> Production and Evaluation of Light Emitting Device CD10 A light emitting device CD10 was produced in the same manner as Comparative Example CD1 except that the hole transport layer and the light emitting layer were formed as follows.

(Formation of hole transport layer)
Cyclohexylbenzene, 4-methoxytoluene, 3-phenoxytoluene, and 2,6-di-tert-butyl-4-methylphenol were mixed in a mass ratio of 48.39:29.97:21.63:0.01. Polymer compound 5 was dissolved in a solvent mixed with (hereinafter also referred to as "organic solvent 2") at a concentration of 0.6% by mass based on the amount of organic solvent 2. Using the obtained solution, a film with a thickness of 20 nm was formed by spin coating on the hole injection layer, and a positive injection layer was formed by heating it on a hot plate at 200°C for 30 minutes in a nitrogen gas atmosphere. A pore transport layer was formed.

(Formation of light emitting layer)
In Comparative Example CD1 (formation of light emitting layer), instead of "a solution in which polymer compound 2 was dissolved in organic solvent 1 at a concentration of 0.9% by mass based on the amount of organic solvent 1", "organic A light-emitting layer was formed in the same manner as Comparative Example CD1, except that a solution in which polymer compound 6 was dissolved in solvent 2 at a concentration of 0.9% by mass based on the amount of organic solvent 2 was used.

EL light emission was observed by applying a voltage to the light emitting element CD10. The luminous efficiency of the light emitting element CD10 at 1000 cd/m ² was 1.9 cd/A.

<Example D4> Production and evaluation of light-emitting element D4 In place of "organic solvent 2" in Comparative Example CD10 (formation of light-emitting layer), "KF-50 100cs (Shin-Etsu Chemical Co., Ltd.), which is a silicone oil, was added to organic solvent 2. Manufactured by Kogyo Co., Ltd., a structural unit represented by formula (2) (in which B ¹ is a methyl group and s is 0), and a structural unit represented by formula (2) (in which B ¹ is a phenyl group, Comparative Example CD10 except that a solvent in which a polymer compound B) having a structural unit represented by s is 0 was mixed at a concentration of 10 ppm by mass with respect to the amount of organic solvent 2 was used. Light emitting device D4 was produced in the same manner.
EL light emission was observed by applying a voltage to the light emitting element D4. The luminous efficiency of light emitting element D4 at 1000 cd/m ² was 4.2 cd/A.

<Example D5> Production and evaluation of light-emitting element D5 In place of "organic solvent 2" in Comparative Example CD10 (formation of light-emitting layer), "KF-50 100cs (manufactured by Shin-Etsu Chemical Co., Ltd.) was added to organic solvent 2. Light-emitting element D5 was produced in the same manner as Comparative Example CD10, except that a "solvent mixed at a concentration of 100 mass ppm with respect to the amount of organic solvent 2" was used.
EL light emission was observed by applying a voltage to the light emitting element D5. The luminous efficiency of the light emitting element D5 at 1000 cd/m ² was 4.3 cd/A.

<Example D6> Preparation and evaluation of light emitting element D6 In place of "organic solvent 2" in Comparative example CD10 (formation of light emitting layer), "KF-50 100cs (manufactured by Shin-Etsu Chemical Co., Ltd.) was added to organic solvent 2. Light-emitting element D6 was produced in the same manner as Comparative Example CD10, except that a "solvent mixed with the following at a concentration of 1000 ppm by mass based on the amount of organic solvent 2" was used.
EL light emission was observed by applying a voltage to the light emitting element D6. The luminous efficiency of the light emitting element D6 at 1000 cd/m ² was 2.2 cd/A.

Table 5 shows the results of Comparative Example CD10 and Examples D4, D5, and D6.

<Comparative Example CD11> Preparation and Evaluation of Light-emitting Element CD11 In place of "High-molecular compound 6" in Comparative Example CD10 (formation of light-emitting layer), "High-molecular compound 7" was added at a ratio of 1% to the amount of organic solvent 2. A light emitting device CD11 was produced in the same manner as Comparative Example CD10, except that a film having a thickness of 85 nm was formed using a solution dissolved at a concentration of .2% by mass.
EL light emission was observed by applying a voltage to the light emitting element CD11. The luminous efficiency of the light emitting element CD11 at 1000 cd/m ² was 3.6 cd/A.

<Example D7> Preparation and evaluation of light emitting element D7 In place of "organic solvent 2" in Comparative example CD11 (formation of light emitting layer), "KF-50 100cs (Shin-Etsu Chemical Co., Ltd.), which is a silicone oil, was added to organic solvent 2. Light-emitting element D7 was produced in the same manner as Comparative Example CD11, except that a "solvent prepared by mixing the following compounds (manufactured by Kogyo Co., Ltd.) at a concentration of 10 mass ppm with respect to the amount of organic solvent 2" was used.
EL light emission was observed by applying a voltage to the light emitting element D7. The luminous efficiency of light emitting element D7 at 1000 cd/m2 was 5.6 cd/A.

<Example D8> Preparation and evaluation of light-emitting element D8 In place of "organic solvent 2" in Comparative example CD11 (formation of light-emitting layer), "KF-50 100cs (manufactured by Shin-Etsu Chemical Co., Ltd.) was added to organic solvent 2. Light-emitting element D8 was produced in the same manner as Comparative Example CD11, except that a "solvent mixed at a concentration of 100 mass ppm with respect to the amount of organic solvent 2" was used.
EL light emission was observed by applying a voltage to the light emitting element D8. The luminous efficiency of light emitting element D8 at 1000 cd/m ² was 6.0 cd/A.

<Example D9> Production and evaluation of light-emitting element D9 In place of "organic solvent 2" in Comparative Example CD11 (formation of light-emitting layer), "KF-50 100cs (manufactured by Shin-Etsu Chemical Co., Ltd.) was added to organic solvent 2. Light-emitting element D9 was produced in the same manner as Comparative Example CD11, except that a "solvent mixed at a concentration of 1000 ppm by mass with respect to the amount of organic solvent 2" was used.
EL light emission was observed by applying a voltage to the light emitting element D9. The luminous efficiency of light emitting element D9 at 1000 cd/m ² was 3.8 cd/A.

Table 6 shows the results of Comparative Example CD11 and Examples D7, D8, and D9.

Examples D1, D2 and D3 using polymer compound 2 and KF-96 1000cs, Examples D4, D5 and D6 using polymer compound 6 and KF-50 100cs, and polymer compound 7 and KF Examples D7, D8, and D9 using −50 100 cs had excellent luminous efficiency. Polymer compound 2, polymer compound 6, and polymer compound 7 correspond to polymer compound A and contain the structural unit represented by formula (1), and KF-96 1000cs and KF-50 100cs are polymer compound A. This corresponds to molecular compound B. The present inventors speculated that the reason why Examples D1 to D9 had excellent luminous efficiency was that polymer compound A and polymer compound B were used together. The polymer compound 2, the polymer compound 6, and the polymer compound 7 have a structural unit derived from a diamine having an arylene group that is a condensed ring, but the condensed ring generally tends to have a planar structure. The structural unit represented by formula (1) having a condensed ring tends to have a shape in which the intermolecular condensed ring structures overlap, and when such intermolecular interaction occurs, a non-radiative deactivation process is promoted and light emission occurs. Efficiency may be reduced. However, the present inventors conjectured that by using polymer compound A and polymer compound B together, the intermolecular interaction between polymer compounds A was inhibited, and as a result, the luminous efficiency was improved. Note that polymer compound B was suitable as a material to be used in combination with polymer compound A because it has excellent chemical stability and does not deteriorate the light emitting characteristics of the organic EL element.

Claims

A composition containing a polymer compound A containing a structural unit represented by formula (1), a polymer compound B containing a structural unit represented by formula (2), and a solvent.

[In the formula,
Ar represents an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of Ars may be the same or different.
Ar' is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group, and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of Ar's may be the same or different.
Z is a condensed ring arylene group or a condensed ring divalent heterocyclic group, and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. ]

[In the formula,
B 1 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a hydroxyalkyl group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a halogen atom; The group may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of B 1 's may be the same or different.
s represents an integer greater than or equal to 0. A plurality of s may be the same or different. ]
The content of the polymer compound A is more than 1000 mass ppm relative to the solvent, and the content of the polymer compound B is more than 0 mass ppm and 1000 mass ppm or less relative to the solvent. , the composition of claim 1.
The composition according to claim 1 or 2, wherein the Ar is an arylene group which may have a substituent, and the Ar' is an aryl group which may have a substituent.
The composition according to claim 1 or 2, wherein the Ar is a phenylene group that may have a substituent, and the Ar' is a phenyl group that may have a substituent.
Z is a bicyclic, tricyclic, tetracyclic, pentacyclic or hexacyclic arylene group, or a bicyclic, tricyclic, tetracyclic, pentacyclic or hexacyclic arylene group; The composition according to claim 1 or 2, which is a valent heterocyclic group, and these groups may have a substituent.
The composition according to claim 1 or 2, wherein the Z is a tricyclic arylene group or a tricyclic divalent heterocyclic group, and these groups may have a substituent. .
The composition according to claim 1 or 2, wherein the B 1 is an alkyl group or an aryl group, and these groups may have a substituent.
3. The polymer compound A further comprises at least one structural unit selected from the group consisting of a structural unit represented by formula (Y) and a structural unit represented by formula (X). Compositions as described.

[In the formula, Ar Y1 represents an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded; The group may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. ]

[In the formula,
a X1 and a X2 each independently represent an integer of 0 or more.
Ar X1 and Ar X3 each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded.
Ar X2 and Ar X4 each independently represent an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded. These groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. When a plurality of Ar X2 's exist, they may be the same or different. When a plurality of Ar X4 's exist, they may be the same or different.
R X1 , R X2 and R X3 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. When a plurality of R x2s exist, they may be the same or different. When a plurality of R X3s exist, they may be the same or different. ]
A claim in which the polymer compound A includes a structural unit represented by formula (Y-1) or a structural unit represented by formula (Y-2) as the structural unit represented by formula (Y). 8. The composition according to 8.

[In the formula,
R Y1 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a fluorine atom, and these groups are substituents. It may have. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of R Y1s may be the same or different, and may be bonded to each other to form a ring with the carbon atoms to which they are bonded.
X Y1 represents a group represented by -C(R Y2 ) 2 -, -C(R Y2 )=C(R Y2 )-, or -C(R Y2 ) 2 -C(R Y2 ) 2 -. R Y2 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a fluorine atom, and these groups are substituents. It may have. When a plurality of substituents exist, they may be the same or different, and may be bonded to each other to form a ring with the atoms to which they are bonded. A plurality of R Y2s may be the same or different, and may be bonded to each other to form a ring with the carbon atoms to which they are bonded. ]
The composition according to claim 1 or 2, wherein the solvent is an aromatic hydrocarbon solvent or an aromatic ether solvent.
The composition according to claim 1 or 2, wherein the solvent contains two or more types of solvents.
The composition according to claim 11, wherein at least one of the two or more solvents is an aromatic hydrocarbon solvent or an aromatic ether solvent.
The composition according to claim 11, wherein at least two of the two or more solvents are at least two selected from the group consisting of aromatic hydrocarbon solvents and aromatic ether solvents.
The composition according to claim 1 or 2, further comprising at least one selected from the group consisting of a hole transport material, a hole injection material, an electron transport material, an electron injection material, a luminescent material, and an antioxidant.
A method for manufacturing a light-emitting element having an anode, a cathode, and one or more organic layers provided between the anode and the cathode,
A method for manufacturing the light emitting device, comprising the step of forming at least one of the organic layers by a wet method using the composition according to claim 1 or 2.