Composition and method for producing light-emitting device using same

Abstract

To provide a composition useful for manufacturing a light-emitting element with excellent luminous efficiency and to provide a manufacturing method for the light-emitting element formed by using the composition.SOLUTION: A composition includes at least one compound A selected from the group consisting of a metal complex represented by formula (1) and a polymer compound A including a constitutional unit having a group made by removing one or more hydrogen atoms from the metal complex represented by the formula (1), a polymer compound B including a constitutional unit which is a specific siloxane group, and a solvent. A surface tension γ0 [mN / m] of the solvent at 25°C and a surface tension γ100 [mN / m] at 25°C when the solvent contains 100 mass ppm of the polymer compound B satisfy the relationship of γ0-γ100>1.0 [mN / m].SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a composition and a method for producing a light-emitting element using the same. [Background technology]

[0002] Light-emitting elements such as organic electroluminescence elements can be suitably used for display and lighting applications. From the viewpoints of simplifying the manufacturing process for large-area elements and reducing manufacturing costs, a wet method using a solvent is advantageous for forming an organic layer of a light-emitting element. For example, Patent Document 1 describes a composition containing a phosphorescent compound and a solvent as a composition used in the wet method. Note that this composition does not contain a polymer compound B containing a constitutional unit represented by the formula (2) described below. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-036388 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the light emitting efficiency of the light emitting element formed using the above composition is not necessarily sufficient. Therefore, an object of the present invention is to provide a composition useful for manufacturing a light-emitting element having excellent luminous efficiency. Another object of the present invention is to provide a method for manufacturing a light-emitting element formed using the composition. [Means for solving the problem]

[0005] The present invention provides the following [1] to

[13] . [1] A composition comprising at least one compound A selected from the group consisting of a metal complex represented by formula (1) and a polymer compound A comprising a structural unit having a group in which one or more hydrogen atoms have been removed from the metal complex represented by formula (1), a polymer compound B comprising a structural unit represented by formula (2), and a solvent, wherein the surface tension γ0 [mN / m] of the solvent at 25°C and the surface tension γ 100 [mN / m] and γ0-γ 100 >1.0[mN / m]. [ka] [In the formula, M represents a rhodium atom, a palladium atom, an iridium atom, or a platinum atom. n 1 represents an integer of 1 or more, and n 2 represents an integer of 0 or more. However, when M is a rhodium atom or an iridium atom, n 1 +n 2 is 3, and when M is a palladium atom or a platinum atom, n 1 +n 2 is 2. E 1 and E 2 Each of E independently represents a carbon atom or a nitrogen atom. 1 and E 2 When multiple are present, they may be the same or different. Ring L 1 represents a monocyclic aromatic heterocycle, and the ring may have a substituent. When a plurality of the substituents are present, they may be the same or different. Ring L 1 When multiple are present, they may be the same or different. Ring L 2 represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and these rings may have a substituent. When a plurality of the substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which each is bonded. Ring L 2 When multiple are present, they may be the same or different. Ring L 1 and the ring L 2 may be the same or different and may be bonded to each other to form a ring together with the atom to which they are bonded. A 1 -G 1 -A 2 represents an anionic bidentate ligand. 1 and A 2 Each of G independently represents a carbon atom, an oxygen atom, or a nitrogen atom, and these atoms may be atoms constituting a ring. 1 is a single bond or A 1 and A 2 A represents an atomic group that, together with 1 -G 1 -A 2 When multiple are present, they may be the same or different. [ka] [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, and these groups may have a substituent. When a plurality of such substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which each is bonded. When a plurality of B 1 may be the same or different. and s represents an integer of 0 or more. A plurality of s's may be the same or different.][2] The composition according to [1], wherein the content of the polymer compound B is more than 0 ppm by mass and 1000 ppm by mass or less with respect to the solvent. [3] The ring L 1 is a 5-membered aromatic heterocycle or a 6-membered aromatic heterocycle, which may have a substituent, and the ring L 2is an aromatic hydrocarbon ring containing a 5-membered ring or a 6-membered ring, or an aromatic heterocycle containing a 5-membered ring or a 6-membered ring, and these rings may have a substituent. The composition according to [1] or [2]. [4] The ring L 1 is a pyridine ring, a diazabenzene ring, a diazole ring or a triazole ring, and these rings may have a substituent, and the ring L 2 is a benzene ring, a pyridine ring or a diazabenzene ring, and these rings may have a substituent. [5] The ring L 1 is a pyridine ring which may have a substituent, and the ring L 2 is a benzene ring which may have a substituent. [6] B above 1 is an alkyl group or an aryl group, which may have a substituent. [7] The composition according to any one of [1] to [6], further comprising at least one compound selected from the group consisting of polymer compounds comprising at least one structural unit selected from the group consisting of a compound represented by formula (H-1) and a structural unit represented by formula (X) and a structural unit represented by formula (Y). [ka] [In the formula, Ar H1 and Ar H2 each independently represents an aryl group, a monovalent heterocyclic group, or a substituted amino group, and these groups may have a substituent. When a plurality of the substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. n H1 represents an integer greater than or equal to 0. L H1represents a divalent group, and these groups may have a substituent. When a plurality of the substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. H1 When a plurality of are present, they may be the same or different and may be bonded to each other directly or via a divalent group to form a ring. Ar H1 and Ar H2 and may be bonded directly or via a divalent group to form a ring. H1 and Ar H1 and may be bonded directly or via a divalent group to form a ring. H1 and Ar H2 may be bonded directly or via a divalent group to form a ring. [ka] [In the formula, a X1 and a X2 each independently represents an integer of 0 or greater. Ar X1 and Ar X3 each independently represents an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When a plurality of the substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. Ar X2 and Ar X4 Each independently 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, and these groups may have a substituent. When a plurality of the substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. Ar X2 When a plurality of Ar are present, they may be the same or different. X4 When multiple are present, they may be the same or different. RX1 , R X2 and R X3 R each independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group, and these groups may have a substituent. When a plurality of the substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. X2 When multiple R are present, they may be the same or different. X3 When multiple are present, they may be the same or different. [ka] [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 to each other, and these groups may have a substituent. When a plurality of such substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. [8] The composition according to any one of [1] to [7], further comprising at least one material selected from the group consisting of a hole transport material, a hole injection material, an electron transport material, an electron injection material, a light emitting material, and an antioxidant. [9] The composition according to any one of [1] to [8], wherein the solvent is an aromatic hydrocarbon solvent or an aromatic ether solvent.

[10] The composition according to any one of [1] to [9], wherein the solvent comprises two or more types of solvents.

[11] The composition according to

[10] , wherein at least one of the two or more solvents is an aromatic hydrocarbon solvent or an aromatic ether solvent.

[12] The composition according to

[10] or

[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.

[13] 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, comprising: A method for producing the light-emitting device, comprising the step of forming at least one of the organic layers by a wet process using the composition according to any one of [1] to

[12] . Effect of the Invention

[0006] According to the present invention, it is possible to provide a composition useful for manufacturing a light-emitting device having excellent luminous efficiency. Also, according to the present invention, it is possible to provide a method for manufacturing a light-emitting device formed using the composition. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Preferred embodiments of the present invention will now be described in detail.

[0008] <Explanation of common terms> Terms commonly used in this specification have the following meanings unless otherwise specified.

[0009] 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 protium atom. In the formula representing a metal complex, the solid line representing a bond to a central metal means an ionic bond, a covalent bond or a coordinate bond. A "low molecular weight compound" is a compound that does not have a molecular weight distribution and has a molecular weight of 1×10 4 The following compound is meant: "Polymer compounds" are compounds that have a molecular weight distribution and have a number average molecular weight of 1 x 10 3 ~1×10 8 The polymer refers to a polymer in which The polymer compound may be any one of a block copolymer, a random copolymer, an alternating copolymer, a graft copolymer, and the like, or may be in other forms. The end group of the polymer compound is preferably a stable group because the light-emitting device has excellent light-emitting properties when the polymer compound is used in the light-emitting device. The end group of the polymer compound is preferably a group that is conjugated with the main chain of the polymer compound, and examples of the end group include an aryl group or a monovalent heterocyclic group that is bonded to the main chain of the polymer compound via a carbon-carbon bond. The term "structural unit" refers to a unit that exists in a polymer compound in one or more instances. A structural unit that exists in a polymer compound in two or more instances is generally called a "repeating unit."

[0010] The "alkyl group" may be either linear or branched. The number of carbon atoms in a linear alkyl group, not including the number of carbon atoms in the substituent, is usually 1 to 50, preferably 1 to 30, more preferably 1 to 20, and even more preferably 1 to 10. The number of carbon atoms in a branched alkyl group, not including the number of carbon atoms in the substituent, is usually 3 to 50, preferably 3 to 30, more preferably 4 to 20, and even more preferably 4 to 10. The alkyl group may have a substituent. Examples of the alkyl group include methyl, ethyl, propyl, isopropyl, butyl, 2-butyl, isobutyl, tert-butyl, pentyl, isoamyl, 2-ethylbutyl, hexyl, heptyl, octyl, 2-ethylhexyl, 3-propylheptyl, decyl, 3,7-dimethyloctyl, 2-ethyloctyl, 2-hexyldecyl, dodecyl, and groups in which some or all of the hydrogen atoms in these groups are substituted with a substituent (e.g., trifluoromethyl, pentafluoroethyl, perfluorobutyl, perfluorohexyl, perfluorooctyl, 3-phenylpropyl, 3-(4-methylphenyl)propyl, 3-(3,5-di-hexylphenyl)propyl, and 6-ethyloxyhexyl). The number of carbon atoms in a "cycloalkyl group" is usually 3 to 50, preferably 3 to 30, more preferably 4 to 20, and further preferably 4 to 10, not including the number of carbon atoms in substituents. 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 have been substituted with substituents. The term "aryl group" refers to 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 of the substituent, is usually 6 to 60, preferably 6 to 40, more preferably 6 to 20, and even more preferably 6 to 10. The aryl group may have a substituent. Examples of the aryl group include a phenyl group, a 1-naphthyl group, a 2-naphthyl group, a 1-anthracenyl group, a 2-anthracenyl group, a 9-anthracenyl group, a 1-pyrenyl group, a 2-pyrenyl group, a 4-pyrenyl group, a 2-fluorenyl group, a 3-fluorenyl group, a 4-fluorenyl group, a 2-phenylphenyl group, a 3-phenylphenyl group, a 4-phenylphenyl group, and groups in which some or all of the hydrogen atoms in these groups are substituted with a substituent.

[0011] The "alkoxy group" may be either linear or branched. The number of carbon atoms of a linear alkoxy group, not including the number of carbon atoms of the substituent, is usually 1 to 50, preferably 1 to 20, and more preferably 1 to 10. The number of carbon atoms of a branched alkoxy group, not including the number of carbon atoms of the substituent, is usually 3 to 50, preferably 4 to 20, and more preferably 4 to 10. The alkoxy group may have a substituent. Examples of the alkoxy group include a methoxy group, an ethoxy group, a propyloxy group, an isopropyloxy group, a butyloxy group, an isobutyloxy group, a tert-butyloxy group, a pentyloxy group, a hexyloxy group, a heptyloxy group, an octyloxy group, a 2-ethylhexyloxy group, a nonyloxy group, a decyloxy group, a 3,7-dimethyloctyloxy group, a lauryloxy group, and groups in which some or all of the hydrogen atoms in these groups are substituted with a substituent. The number of carbon atoms in the "cycloalkoxy group" is usually 3 to 40, and preferably 4 to 10, not including the number of carbon atoms of the substituents. 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 cycloalkoxy group have been 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 further preferably 6 to 10, not including the number of carbon atoms of substituents. The aryloxy group may have a substituent. Examples of the aryloxy group include a phenoxy group, a 1-naphthyloxy group, a 2-naphthyloxy group, a 1-anthracenyloxy group, a 9-anthracenyloxy group, a 1-pyrenyloxy group, and groups in which some or all of the hydrogen atoms in these groups are substituted with substituents.

[0012] The term "p-valent heterocyclic group" (p is an integer of 1 or more) refers to an atomic group remaining after removing p hydrogen atoms from among the hydrogen atoms directly bonded to the carbon atoms or heteroatoms constituting the ring of a heterocyclic compound. Among p-valent heterocyclic groups, a "p-valent aromatic heterocyclic group" which is an atomic group remaining after removing p hydrogen atoms from among the hydrogen atoms directly bonded to the carbon atoms or heteroatoms constituting the ring of an aromatic heterocyclic compound is preferred. The term "aromatic heterocyclic compound" refers to a compound in which the heterocycle itself exhibits aromaticity, such as oxadiazole, thiadiazole, thiazole, oxazole, thiophene, pyrrole, phosphole, furan, pyridine, pyrazine, pyrimidine, triazine, pyridazine, quinoline, isoquinoline, carbazole, or dibenzophosphole, and a compound in which an aromatic ring is condensed with a heterocycle, such as phenoxazine, phenothiazine, dibenzoborole, dibenzosilole, or benzopyran, even if the heterocycle itself does not exhibit aromaticity.

[0013] The number of carbon atoms in the monovalent heterocyclic group, not including the number of carbon atoms in the substituent, is usually 1 to 60, preferably 2 to 40, and more preferably 3 to 20. The number of heteroatoms in the monovalent heterocyclic group, not including the number of heteroatoms in the substituent, is usually 1 to 30, preferably 1 to 10, more preferably 1 to 5, and even more preferably 1 to 3. The monovalent heterocyclic group may have a substituent. Examples of the monovalent heterocyclic group include a thienyl group, a pyrrolyl group, a furyl group, a pyridyl group, a piperidinyl group, a quinolinyl group, an isoquinolinyl group, a pyrimidinyl group, a triazinyl group, and groups in which some or all of the hydrogen atoms in these groups are substituted with substituents.

[0014] The term "halogen atom" refers to a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.

[0015] The "amino group" may have a substituent, and is preferably a substituted amino group. The substituent of the amino group 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 the substituted amino group include a dialkylamino group, a dicycloalkylamino group, a diarylamino group, and groups in which some or all of the hydrogen atoms in these groups have been substituted with a substituent. Examples of the amino group and substituted amino group include a dimethylamino group, a diethylamino group, a diphenylamino group, a bis(4-methylphenyl)amino group, a bis(4-tert-butylphenyl)amino group, a bis(3,5-di-tert-butylphenyl)amino group, and these groups in which some or all of the hydrogen atoms have been substituted with substituents.

[0016] The "alkenyl group" may be either linear or branched. The number of carbon atoms of a linear alkenyl group, not including the number of carbon atoms of the substituent, is usually 2 to 50, preferably 2 to 20, and more preferably 2 to 10. The number of carbon atoms of a branched alkenyl group, not including the number of carbon atoms of the substituent, is usually 3 to 50, preferably 4 to 20, and more preferably 4 to 10. The number of carbon atoms of a "cycloalkenyl group", not including the number of carbon atoms of the substituent, is usually 3 to 30, preferably 4 to 20, and more preferably 4 to 10. The alkenyl group and the cycloalkenyl group may have a substituent. Examples of the alkenyl group and the cycloalkenyl group include a vinyl group, a 1-propenyl group, a 2-propenyl group, a 2-butenyl group, a 3-butenyl group, a 3-pentenyl group, a 4-pentenyl group, a 1-hexenyl group, a 5-hexenyl group, a 7-octenyl group, and groups in which some or all of the hydrogen atoms in these groups are substituted with a substituent.

[0017] The "alkynyl group" may be either linear or branched. The number of carbon atoms of the alkynyl group, not including the carbon atoms of the substituent, is usually 2 to 50, preferably 3 to 20, and more preferably 3 to 10. The number of carbon atoms of the branched alkynyl group, not including the carbon atoms of the substituent, is usually 4 to 30, preferably 4 to 20, and more preferably 4 to 10. The number of carbon atoms in the "cycloalkynyl group" is usually 4 to 50, preferably 5 to 20, and more preferably 6 to 10, not including the carbon atoms of substituents. The alkynyl group and the cycloalkynyl group may have a substituent. Examples of the alkynyl group and the cycloalkynyl group include an ethynyl group, a 1-propynyl group, a 2-propynyl group, a 2-butynyl group, a 3-butynyl group, a 3-pentynyl group, a 4-pentynyl group, a 1-hexynyl group, a 5-hexynyl group, and groups in which some or all of the hydrogen atoms in these groups are substituted with a substituent.

[0018] The term "arylene group" refers to 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 is usually 6 to 60, preferably 6 to 40, and more preferably 6 to 20, not including the number of carbon atoms of the substituent. 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 perylenediyl group, a chrysenediyl group, and groups in which some or all of the hydrogen atoms in these groups are substituted with a substituent, and preferably the groups represented by formulas (A-1) to (A-20). The arylene group includes groups in which a plurality of these groups are bonded.

[0019] [ka] [ka] [ka] [ka] [Wherein, R and R a Each independently 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 may have a substituent. When there are a plurality of such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. When there are a plurality of R's, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. a may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded.

[0020] The number of carbon atoms in the divalent heterocyclic group, not including the number of carbon atoms in the substituents, is usually 1 to 60, preferably 2 to 40, and more preferably 3 to 20. The number of heteroatoms in the divalent heterocyclic group, not including the number of heteroatoms in the substituents, 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 the divalent heterocyclic group include divalent groups obtained by removing two hydrogen atoms from the hydrogen atoms directly bonded to the carbon atoms or heteroatoms constituting the ring from pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, dibenzosilole, phenoxazine, phenothiazine, acridine, dihydroacridine, dihydrophenazine, furan, thiophene, azole, diazole, and triazole, and divalent groups in which some or all of the hydrogen atoms in the group are substituted with substituents, and preferably the groups represented by formulae (AA-1) to (AA-34). The divalent heterocyclic group includes groups in which a plurality of these groups are bonded.

[0021] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [Wherein, R and R a has the same meaning as above.]

[0022] The "crosslinking group" is a group capable of generating a new bond by heating, irradiation with ultraviolet light, near-ultraviolet light, visible light, infrared light, 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.

[0023] [ka] [In the formula, R XL represents a methylene group, an oxygen atom, or a sulfur atom; n XL represents an integer from 0 to 5. XL When multiple n are present, they may be the same or different. XL may be the same or different. *1 represents the bonding position. These bridging groups may have a substituent. When a plurality of such substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which each is bonded.]

[0024] 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, an alkenyl group, a cycloalkenyl group, an alkynyl group, and a cycloalkynyl group. The substituent may be a bridging group. When a plurality of substituents are present, they may be bonded to each other to form a ring together with the atom to which they are bonded, but it is preferable that they do not form a ring.

[0025] <Composition of the Present Embodiment> The composition of this embodiment is a composition containing at least one compound A (hereinafter also referred to as "compound A") selected from the group consisting of a metal complex represented by formula (1) and a polymer compound A containing a structural unit having a group in which one or more hydrogen atoms have been removed from the metal complex represented by formula (1), a polymer compound B containing a structural unit represented by formula (2), and a solvent. The composition of this embodiment is also a composition containing at least one compound A (hereinafter also referred to as "compound A") selected from the group consisting of a metal complex represented by formula (1) and a polymer compound B containing a structural unit represented by formula (2), and a solvent. The composition of this embodiment is also a composition containing at least one compound A (hereinafter also referred to as "compound A"), a polymer compound B containing a structural unit represented by formula (2), and a solvent. 100 [mN / m] and γ0-γ 100 >1.0[mN / m]. γ0-γ 100 is preferably 1.5 to 15.0 [mN / m], more preferably 2.0 to 14.0 [mN / m], even more preferably 2.5 to 13.0 [mN / m], and particularly preferably 3.0 to 12.0 [mN / m], since the light-emitting element of this embodiment has a better luminous efficiency. In the composition of this embodiment, compound A, polymer compound B, and the solvent are different. The composition of the present embodiment may contain only one type of compound A, one type of polymer compound B, and one type of solvent, or may contain two or more types of each. The composition of the present embodiment can be suitably used, for example, as a composition for a light-emitting device. A light-emitting device formed using the composition of the present embodiment (hereinafter also referred to as the "light-emitting device of the present embodiment") has superior luminous efficiency.

[0026] In the composition of this embodiment, the total content of compound A, polymer compound B, and solvent may be within a range in which the composition (for example, a composition for a light-emitting device, the same applies below) can function. In the composition of this embodiment, the total content of compound A, polymer compound B, and solvent may be, for example, 1 to 100% by mass based on the total amount of the composition, and is preferably 10 to 100% by mass, more preferably 30 to 100% by mass, even more preferably 50 to 100% by mass, particularly preferably 70 to 100% by mass, and particularly preferably 90 to 100% by mass, since the light-emitting device of this embodiment has a higher luminous efficiency.

[0027] In the composition of the present embodiment, the content of polymer compound B may be within a range in which the composition can exhibit its functions. In the composition of the present embodiment, the content of polymer compound B relative to the content of the solvent may be, for example, more than 0 ppm by mass and 100 ppm by mass or less, more than 0 ppm by mass and 50 ppm by mass or less, more than 0 ppm by mass and 10 ppm by mass or less, or more than 0 ppm by mass and 1% by mass or less. Since the luminous efficiency of the light-emitting element of the present embodiment is more excellent, the content is preferably more than 0 ppm by mass and 5000 ppm by mass or less, more preferably more than 0 ppm by mass and 1000 ppm by mass or less, and even more preferably 0.01 ppm by mass or more and 1000 ppm by mass or less. Since the luminous efficiency of the light-emitting element of the present embodiment is even more excellent, the content is preferably 0.1 ppm by mass or more and 1000 ppm by mass or less, more preferably 0.5 ppm by mass or more and 1000 ppm by mass or less, even more preferably 1 ppm by mass or more and less than 1000 ppm by mass, particularly preferably 5 ppm by mass or more and 500 ppm by mass or less, and particularly preferably 10 ppm by mass or more and 100 ppm by mass or less.

[0028] In the composition of this embodiment, the content of compound A is preferably greater than the content of polymer compound B, since the light-emitting device of this embodiment has a better luminous efficiency. In the composition of this embodiment, the content of the solvent is preferably greater than the content of compound A, since the light-emitting device of this embodiment has a better luminous efficiency. In the composition of this embodiment, the content of compound A is preferably greater than the content of polymer compound B, and the content of the solvent is preferably greater than the content of compound A, since the light-emitting device of this embodiment has a better luminous efficiency.

[0029] <Compound A> Compound A is a metal complex represented by formula (1) or polymer compound A. Compound A is preferably a metal complex represented by formula (1) because the light emitting device of this embodiment has a higher luminous efficiency.

[0030] [Metal complex represented by formula (1)] The metal complex represented by formula (1) is preferably a low molecular weight compound. The molecular weight of the metal complex represented by formula (1) is preferably 3×10 2 ~1×10 4 and more preferably 5×10 2 ~7×10 3 and more preferably 7×10 2 ~5×10 3 and particularly preferably 1×10 3 ~3×10 3 It is.

[0031] M is preferably an iridium atom or a platinum atom, and more preferably an iridium atom, since the light-emitting element of this embodiment has better luminous efficiency. When M is a rhodium atom or an iridium atom, n 1 is preferably 2 or 3, and more preferably 3. When M is a palladium atom or a platinum atom, n 1 is preferably 2.

[0032] E 1 and E 2 At least one of E is preferably a carbon atom; 1 and E 2 More preferably, is a carbon atom. The metal complex represented by formula (1) can be easily synthesized, so E 1 and E 2 In addition, since the metal complex represented by formula (1) can be easily synthesized, E 1 If there are multiple, there are multiple E 1 It is preferable that at least two of the E 1 It is more preferable that all of E are the same. In addition, since the metal complex represented by formula (1) can be easily synthesized, 2 If there are multiple, there are multiple E 2 It is preferable that at least two of the E 2 It is more preferred that all of are identical.

[0033] Ring L 1 The number of carbon atoms of the monocyclic aromatic heterocycle in the formula (I) is preferably 1 to 10, more preferably 2 to 5, still more preferably 3 to 5, and particularly preferably 5, not including the number of carbon atoms of the substituent. 1 The number of heteroatoms in the monocyclic aromatic heterocycle is preferably 1 to 10, more preferably 1 to 5, further preferably 1 to 3, and particularly preferably 1, not including the number of heteroatoms in the substituents. Ring L 1 Examples of the aromatic heterocycle include monocyclic aromatic heterocycles containing one or more nitrogen atoms in the ring, and the aromatic heterocycle may have a substituent. 1 is preferably a 5-membered aromatic heterocycle or a 6-membered aromatic heterocycle, since the light-emitting device of this embodiment has a better luminous efficiency, more preferably a 5-membered aromatic heterocycle containing 2 to 4 nitrogen atoms in the ring, or a 6-membered aromatic heterocycle containing 1 to 4 nitrogen atoms in the ring, even more preferably a 5-membered aromatic heterocycle containing 2 or 3 nitrogen atoms in the ring, or a 6-membered aromatic heterocycle containing 1 or 2 nitrogen atoms in the ring, and particularly preferably a 6-membered aromatic heterocycle containing 1 or 2 nitrogen atoms in the ring, and these rings may have a substituent. However, ring L 1 When is a 6-membered aromatic heterocycle, E 1 is preferably a carbon atom. Ring L 1 is preferably a pyridine ring, a diazabenzene ring, a triazole ring, or a diazole ring, more preferably a pyridine ring or a diazabenzene ring, and even more preferably a pyridine ring, since the light-emitting element of this embodiment has even better luminous efficiency. These rings may have a substituent. The metal complex represented by formula (1) can be easily synthesized, so that ring L 1 If there are multiple rings, there are multiple rings L 1 At least two of the rings L are preferably the same. 1It is more preferred that all of are identical.

[0034] Ring L 2 The number of carbon atoms in the aromatic hydrocarbon ring is preferably 6 to 60, more preferably 6 to 40, and even more preferably 6 to 20, not including the number of carbon atoms of the substituent. Ring L 2 The aromatic hydrocarbon ring in is preferably an aromatic hydrocarbon ring containing a 5-membered ring or a 6-membered ring, and these aromatic hydrocarbon rings may have a substituent. 2 The aromatic hydrocarbon ring in is preferably a monocyclic, bicyclic or tricyclic aromatic hydrocarbon ring (preferably an aromatic hydrocarbon ring containing a 5-membered or 6-membered ring), since the light-emitting element of this embodiment has better luminous efficiency, more preferably a benzene ring, a naphthalene ring, a fluorene ring, a phenanthrene ring or a dihydrophenanthrene ring, even more preferably a benzene ring or a fluorene ring, and particularly preferably a benzene ring, and these rings may have a substituent. Ring L 2 The number of carbon atoms in the aromatic heterocycle in the formula (I) is preferably 1 to 60, more preferably 2 to 40, and even more preferably 3 to 20, not including the number of carbon atoms in the substituent. 2 The number of heteroatoms in the aromatic heterocycle is preferably 1 to 10, more preferably 1 to 5, and further preferably 1 to 3, not including the number of heteroatoms in the substituents. Ring L 2 The aromatic heterocycle in the formula (I) is preferably an aromatic heterocycle containing a 5-membered or 6-membered ring, and these aromatic heterocycles may have a substituent. 2The aromatic heterocycle in is preferably a monocyclic, bicyclic or tricyclic aromatic heterocycle (preferably an aromatic heterocycle containing a 5-membered or 6-membered ring) since the light-emitting element of this embodiment has a higher luminous efficiency, more preferably a pyridine ring, a diazabenzene ring, an azanaphthalene ring, a diazanaphthalene ring, an indole ring, a benzofuran ring, a benzothiophene ring, a carbazole ring, an azacarbazole ring, a diazacarbazole ring, a dibenzofuran ring or a dibenzothiophene ring, further preferably a pyridine ring, a diazabenzene ring, a carbazole ring, a dibenzofuran ring or a dibenzothiophene ring, and particularly preferably a pyridine ring or a diazabenzene ring, and these rings may have a substituent. Ring L 2 is preferably a monocyclic, bicyclic or tricyclic aromatic hydrocarbon ring (preferably an aromatic hydrocarbon ring containing a 5-membered ring or a 6-membered ring) or a monocyclic, bicyclic or tricyclic aromatic heterocycle (preferably an aromatic heterocycle containing a 5-membered ring or a 6-membered ring), more preferably a benzene ring, a fluorene ring, a pyridine ring, a diazabenzene ring, a carbazole ring, a dibenzofuran ring or a dibenzothiophene ring, further preferably a benzene ring, a pyridine ring or a diazabenzene ring, and particularly preferably a benzene ring, and these rings may have a substituent. The metal complex represented by formula (1) can be easily synthesized, so that ring L 2 If there are multiple rings, there are multiple rings L 2 At least two of the rings L are preferably the same. 2 It is more preferred that all of are identical.

[0035] Since the light emitting device of this embodiment has a higher light emitting efficiency, 1 is a 5-membered aromatic heterocycle or a 6-membered aromatic heterocycle, and ring L 2is preferably an aromatic hydrocarbon ring containing a 5-membered ring or a 6-membered ring (preferably a monocyclic, bicyclic or tricyclic aromatic hydrocarbon ring) or an aromatic heterocycle containing a 5-membered ring or a 6-membered ring (preferably a monocyclic, bicyclic or tricyclic aromatic heterocycle), and ring L 1 is a pyridine ring, a diazabenzene ring, a diazole ring or a triazole ring, and ring L 2 is more preferably a benzene ring, a fluorene ring, a pyridine ring, a diazabenzene ring, a carbazole ring, a dibenzofuran ring or a dibenzothiophene ring, and ring L 1 is a pyridine ring or a diazabenzene ring, and ring L 2 is more preferably a benzene ring, a fluorene ring, a pyridine ring, a diazabenzene ring, a carbazole ring, a dibenzofuran ring or a dibenzothiophene ring, and ring L 1 is a pyridine ring or a diazabenzene ring, and ring L 2 is particularly preferably a benzene ring, a pyridine ring or a diazabenzene ring, and ring L 1 is a pyridine ring, and ring L 2 is particularly preferably a benzene ring, and these rings may have a substituent.

[0036] Ring L 1 and ring L 2 The substituent which may be possessed by the group (hereinafter also referred to as "primary substituent") is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a fluorine atom, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, still more preferably an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group, and particularly preferably an alkyl group, a cycloalkyl group, or an aryl group, and these groups may further have a substituent (hereinafter also referred to as "secondary substituent").

[0037] Ring L 1 and ring L 2At least one of these preferably has a primary substituent, since this provides the light-emitting device of this embodiment with superior luminous efficiency. In the metal complex represented by formula (1), ring L 1 and ring L 2 At least one of the rings L 1 and ring L 2 If there are multiple rings, there are multiple rings L 1 and ring L 2 At least one of the rings L may have a primary substituent. However, since the light emitting device of this embodiment has a higher luminous efficiency, it is preferable that a plurality of rings L 1 and ring L 2 It is preferred that at least two of the rings L have a primary substituent. 1 and ring L 2 It is more preferable that at least three of the rings L 1 and ring L 2 At least one of the rings L 1 and ring L 2 When a plurality of rings L are present, the light emitting efficiency of the light emitting device of this embodiment is superior. 1 At least two of the rings L have primary substituents, or 2 It is preferred that at least two of the rings L have a primary substituent. 1 All of the rings L have primary substituents, or multiple rings L 2 It is more preferable that all of the rings L 2 It is more preferred that all of have a primary substituent. In the metal complex represented by formula (1), ring L 1 and ring L 2 When at least one of the rings L 1 and ring L 2The number of primary substituents possessed by at least one of the above is usually 1 to 10. Since the metal complex represented by formula (1) can be easily synthesized and the light-emitting element of the present embodiment has better luminous efficiency, the number of primary substituents is preferably 1 to 5, more preferably 1 to 3, even more preferably 1 or 2, and particularly preferably 1. In the metal complex represented by formula (1), ring L 1 and ring L 2 When at least one of the rings L has a primary substituent and M is a rhodium atom or an iridium atom, 1 and ring L 2 The total number of primary substituents possessed by is usually 1 to 30, and since the metal complex represented by formula (1) can be easily synthesized and the light-emitting element of the present embodiment has better luminous efficiency, the total number is preferably 1 to 18, more preferably 2 to 12, even more preferably 3 to 6, and particularly preferably 3. In the metal complex represented by formula (1), ring L 1 and ring L 2 When at least one of the rings L has a primary substituent and M is a palladium atom or a platinum atom, 1 and ring L 2 The total number of primary substituents possessed by is usually 1 to 20, and since the metal complex represented by formula (1) can be easily synthesized and the light-emitting element of the present embodiment has superior luminous efficiency, the total number is preferably 1 to 12, more preferably 1 to 8, even more preferably 2 to 4, and particularly preferably 2.

[0038] The aryl group in the primary substituent is preferably a group in which one hydrogen atom directly bonded to a carbon atom constituting a ring has been removed from a monocyclic, bicyclic or tricyclic aromatic hydrocarbon, more preferably a phenyl group, a naphthyl group or a fluorenyl group, and even more preferably a phenyl group, and these groups may have a substituent. The monovalent heterocyclic group in the primary substituent is preferably a group in which one hydrogen atom directly bonded to a carbon atom or hetero atom constituting the ring has been removed from a monocyclic, bicyclic or tricyclic heterocyclic compound, more preferably a group in which one hydrogen atom directly bonded to a carbon atom or hetero atom constituting the ring has been removed from a pyridine ring, a diazabenzene ring, a triazine ring, an azanaphthalene ring, a diazanaphthalene ring, a carbazole ring, a dibenzofuran ring or a dibenzothiophene ring, and even more preferably a group in which one hydrogen atom directly bonded to a carbon atom constituting the ring has been removed from a pyridine ring, a diazabenzene ring or a triazine ring, and these groups may have a substituent. In the substituted amino group in the primary substituent, the substituent of the amino group is preferably an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and these groups may further have a substituent. The examples and preferred ranges of the aryl group and the monovalent heterocyclic group in the substituent of the amino group are the same as the examples and preferred ranges of the aryl group and the monovalent heterocyclic group in the primary substituent, respectively.

[0039] Examples and preferred ranges of the secondary substituent (substituent which the primary substituent may further have) are the same as the examples and preferred ranges of the primary substituent. The secondary substituent may further have a substituent (hereinafter also referred to as a "tertiary substituent"). Examples and preferred ranges of the tertiary substituent (substituent that the secondary substituent may further have) are the same as the examples and preferred ranges of the primary substituent. The tertiary substituent may further have a substituent (hereinafter, also referred to as "quaternary substituent"). The quaternary substituent (the substituent that the tertiary substituent may further have) is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a fluorine atom, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, still more preferably an alkyl group, a cycloalkyl group, or an aryl group, and particularly preferably an alkyl group or a cycloalkyl group. These groups may further have a substituent, but since the metal complex represented by formula (1) can be easily synthesized, 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 secondary substituent, tertiary substituent, and quaternary substituent are the same as the examples and preferred ranges of the aryl group, monovalent heterocyclic group, and substituted amino group in the primary substituent, respectively.

[0040] (anionic bidentate ligand) A 1 -G 1 -A 2 Examples of the anionic bidentate ligand represented by the formula include the ligand represented by the formula: 1 -G 1 -A 2 The anionic bidentate ligand represented by the subscript n 1 The number of ligands is defined as different from that of the ligands. [ka] [In the formula, * represents the site binding to M.]

[0041] Examples of the metal complex represented by formula (1) include the metal complexes shown below. [ka] [ka] [ka] [ka]

[0042] In the composition of this embodiment, the content of the metal complex represented by formula (1) may be within a range in which the composition functions. In the composition of this embodiment, the content of the metal complex represented by formula (1) may be, for example, more than 0 mass ppm and 100 mass% or less, 1 mass ppm or more and 100 mass% or less, 10 mass ppm or more and 100 mass% or less, or 50 mass ppm or more and 50 mass% or less, and since the light-emitting element of this embodiment has a better luminous efficiency, it is preferably 100 mass ppm or more and 30 mass% or less, more preferably 500 mass ppm or more and 10 mass% or less, even more preferably 1000 mass ppm or more and 5 mass% or less, particularly preferably 2000 mass ppm or more and 2 mass% or less, and particularly preferably 5000 mass ppm or more and 1 mass% or less.

[0043] [Polymer compound A] The polymer compound A is a polymer compound containing a structural unit (hereinafter also referred to as "structural unit A") having a group in which one or more hydrogen atoms have been removed from a metal complex represented by formula (1). The polymer compound A is preferably a polymer compound that does not contain a structural unit represented by formula (2). Since the synthesis of the polymer compound A is easy, the structural unit A is preferably a structural unit having a group in which one or more and five or less hydrogen atoms have been removed from a metal complex represented by formula (1), more preferably a structural unit having a group in which one or more and three or less hydrogen atoms have been removed from a metal complex represented by formula (1), and even more preferably a structural unit having a group in which one or two hydrogen atoms have been removed from a metal complex represented by formula (1). The structural unit A is preferably a structural unit represented by formula (AP-1), formula (AP-2) or formula (AP-3), and more preferably a structural unit represented by formula (AP-1) or formula (AP-2), since the synthesis of polymer compound A is easy and the light-emitting element of this embodiment has better luminous efficiency.

[0044] [ka] [In the formula, M AP1 represents a group in which one hydrogen atom has been removed from the metal complex represented by formula (1). M AP2 represents a group in which two hydrogen atoms have been removed from the metal complex represented by formula (1). M AP3 represents a group in which three hydrogen atoms have been removed from the metal complex represented by formula (1). L AP1 each independently represents an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, -N(R AP1 R represents a group represented by the formula (I)-, an oxygen atom, or a sulfur atom, and these groups may have a substituent. When a plurality of the substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. AP1 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group, and these groups may have a substituent. When a plurality of such substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. AP1 When multiple are present, they may be the same or different. n AP1 represents an integer between 0 and 10. Ar AP1 represents a hydrocarbon group or a heterocyclic group, and these groups may have a substituent. When a plurality of such substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which each is bonded.

[0045] L AP1 is preferably an alkylene group, a cycloalkylene group, an arylene group, or a divalent heterocyclic group, more preferably an alkylene group or an arylene group, and even more preferably an arylene group, and these groups may have a substituent. L AP1 Examples and preferred ranges of the arylene group and the divalent heterocyclic group in Y1 The examples and preferred ranges of the arylene group and the divalent heterocyclic group in are the same as those in the above. L AP1 The alkylene group in is preferably a methylene group, an ethylene group or a propylene group, more preferably a methylene group, and these groups may have a substituent.

[0046] R AP1 Examples and preferred ranges of R X1 ~R X3 The examples and preferred ranges are the same as those of the above.

[0047] n AP1 is preferably an integer of 0 to 5, preferably an integer of 0 to 3, more preferably 0 or 1, and even more preferably 0.

[0048] Ar AP1 Examples of the hydrocarbon group in Ar include an aromatic hydrocarbon group which may have a substituent and an aliphatic hydrocarbon group which may have a substituent. AP1 The hydrocarbon group in the above formula includes groups in which a plurality of these groups are bonded. Ar AP1 In the aliphatic hydrocarbon group, n hydrogen atoms are bonded to an alkylene group or a cycloalkylene group. AP1 Preferably, the alkylene group is a group obtained by removing n hydrogen atoms. AP1 These groups may have a substituent. Examples and preferred ranges of the alkylene group are as described below for L H1 Examples of the alkylene group and preferred ranges thereof are as follows: Ar AP1 In the above, the aromatic hydrocarbon group is an arylene group having a hydrogen atom n AP1 Examples of the arylene group and the preferred range thereof are described below in the Ar Y1 Examples of the arylene group and preferred ranges thereof are as follows: Ar AP1 As the heterocyclic group in the formula (I), a divalent heterocyclic group having a hydrogen atom n AP1 Examples of the divalent heterocyclic group and the preferred range thereof are described below in the Ar Y1 Examples of the divalent heterocyclic group and preferred ranges thereof are as follows: AP1 and Ar AP1 Examples of the substituent that may be possessed by Ar and preferred examples thereof are described later. Y1 The examples and preferred ranges of the substituents that may be possessed by the group represented by the following formula are the same as those.

[0049] Examples of the structural unit A include structural units represented by the following formula: In the following formula, the * portion represents a bonding site with other structures constituting the polymer compound A.

[0050] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [In the formula, Z 2 represents a group represented by -CH= or a group represented by -N=. 2 When multiple are present, they may be the same or different. R A represents a hydrogen atom or a primary substituent. A When multiple are present, they may be the same or different.

[0051] The content of the structural unit A contained in the polymer compound A may be within a range in which the function of the polymer compound A can be exhibited. The content of the structural unit A contained in the polymer compound A is, for example, 0.01 to 100 mol % relative to the total content of the structural units contained in the polymer compound A, and since the light emitting device of the present embodiment has a higher luminous efficiency, it is preferably 0.1 to 99 mol %, more preferably 0.5 to 90 mol %, even more preferably 1 to 70 mol %, particularly preferably 5 to 50 mol %, and particularly preferably 10 to 30 mol %. The structural unit A may be contained in the polymer compound A in one type or in two or more types.

[0052] (Other building blocks) Since the light-emitting device of this embodiment has a higher luminous efficiency, it is preferable that the polymer compound A further contains at least one constitutional unit selected from the group consisting of constitutional units represented by the formula (X) and constitutional units represented by the formula (Y) described later. That is, the polymer compound A is preferably a polymer compound containing at least one constitutional unit selected from the group consisting of constitutional units represented by the formula (X) and constitutional units represented by the formula (Y) described later, and the constitutional unit A. When the polymer compound A contains at least one type of constitutional unit selected from the group consisting of constitutional units represented by the formula (X) described below and constitutional units represented by the formula (Y) described below, and the constitutional unit A, it is preferable that the constitutional unit A is different from the constitutional unit represented by the formula (X) described below and the constitutional unit represented by the formula (Y) described below. It is preferable that the polymer compound A further contains a constitutional unit represented by the formula (Y) described below, since this leads to superior luminous efficiency of the light-emitting device of this embodiment. It is preferable that polymer compound A further contains a constitutional unit represented by formula (X) described below, since polymer compound A has excellent hole transport properties and the light emitting device of this embodiment has superior luminous efficiency. It is preferable that the polymer compound A further contains a constitutional unit represented by the formula (X) described below and a constitutional unit represented by the formula (Y) described below, since the polymer compound A has excellent hole transport properties and the light-emitting device of the present embodiment has higher luminous efficiency.

[0053] When the polymer compound A contains a structural unit represented by formula (X) described later, the content of the structural unit represented by formula (X) described later may be within a range in which the polymer compound A exhibits its functions. When the polymer compound A contains a structural unit represented by formula (X) described later, the content of the structural unit represented by formula (X) described later is, for example, 0.01 to 99.9 mol% relative to the total content of structural units contained in the polymer compound A. Since the hole transport property of the polymer compound B is excellent and the light emitting efficiency of the light emitting device of this embodiment is more excellent, the content is preferably 0.05 to 90 mol%, more preferably 0.1 to 70 mol%, even more preferably 0.2 to 50 mol%, particularly preferably 0.5 to 30 mol%, and particularly preferably 1 to 10 mol%. The polymer compound A may contain only one type of constitutional unit represented by formula (X), or may contain two or more types.

[0054] When the polymer compound A contains a constitutional unit represented by formula (Y), the content of the constitutional unit represented by formula (Y) may be within a range in which the function of the polymer compound A can be exhibited. When the polymer compound A contains a constitutional unit represented by formula (Y), the content of the constitutional unit represented by formula (Y) is, for example, 0.1 to 99.99 mol% relative to the total content of constitutional units contained in the polymer compound A, and since the light emitting device of this embodiment has a higher luminous efficiency, the content is preferably 1 to 99.9 mol%, more preferably 10 to 99.5 mol%, even more preferably 30 to 99 mol%, particularly preferably 50 to 95 mol%, and particularly preferably 70 to 90 mol%. The polymer compound A may contain only one type of constitutional unit represented by formula (Y), or may contain two or more types.

[0055] When the polymer compound A contains a structural unit represented by formula (X) and / or a structural unit represented by formula (Y), and the structural unit A, the total content of the structural unit represented by formula (X), the structural unit represented by formula (Y), and the structural unit A may be within a range in which the function of the polymer compound A can be exhibited. When the polymer compound A contains a structural unit represented by formula (X) and / or a structural unit represented by formula (Y), and the structural unit A, the total content of the structural unit represented by formula (X), the structural unit represented by formula (Y), and the structural unit A is, for example, 1 to 100 mol% relative to the total content of the structural units contained in the polymer compound A. Since the hole transport property of the polymer compound A is excellent and the luminous efficiency of the light-emitting element of this embodiment is more excellent, the total content is preferably 10 to 100 mol%, more preferably 30 to 100 mol%, even more preferably 50 to 100 mol%, particularly preferably 70 to 100 mol%, and particularly preferably 90 to 100 mol%.

[0056] A structural unit represented by the formula (Y) Ar Y1 The arylene group represented by the formula (I) is preferably a phenylene group, a naphthalenediyl group, an anthracenediyl group, a phenanthrenediyl group, a dihydrophenanthrenediyl group, a fluorenediyl group, or a pyrenediyl group, since the luminous efficiency of the light-emitting element of this embodiment is superior, and more preferably a phenylene group, a phenanthrenediyl group, a dihydrophenanthrenediyl group, or a fluorenediyl group, and these groups may have a substituent. Ar Y1 The arylene group represented by the formula (A-1) is preferably a group represented by formula (A-1) to formula (A-14), formula (A-19) or formula (A-20), since the luminous efficiency of the light-emitting element of this embodiment is further improved, and is more preferably a group represented by formula (A-1), formula (A-6), formula (A-7), formula (A-9) to formula (A-11), formula (A-13) or formula (A-19), and even more preferably a group represented by formula (A-1), formula (A-7), formula (A-9) or formula (A-19).

[0057] Ar Y1The divalent heterocyclic group represented by the formula (I) is preferably a group in which two hydrogen atoms directly bonded to atoms constituting the ring have been removed from pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, phenoxazine, phenothiazine, 9,10-dihydroacridine, or 5,10-dihydrophenazine, since the light-emitting element of this embodiment has better luminous efficiency, and more preferably a group in which two hydrogen atoms directly bonded to atoms constituting the ring have been removed from pyridine, diazabenzene, triazine, carbazole, dibenzofuran, dibenzothiophene, phenoxazine, or phenothiazine, and these groups may have a substituent. Ar Y1 The divalent heterocyclic group represented by the formula (AA-1) to (AA-15), (AA-18) to (AA-22), (AA-33) or (AA-34) is preferably a group represented by the formula (AA-1) to (AA-6), (AA-10) to (AA-15) or (AA-18) to (AA-22), further preferably a group represented by the formula (AA-4), (AA-10), (AA-13), (AA-15), (AA-18) or (AA-20), since the light-emitting device of this embodiment has even better luminous efficiency.

[0058] Ar Y1 In the divalent group 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, respectively, Ar Y1 The preferred ranges are the same as those of the arylene group and the divalent heterocyclic group represented by the following formula: Ar Y1 In the above, examples of the "divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded to each other" include groups represented by the following formulae, and these groups may have a substituent.

[0059] [ka]

[0060] Ar Y1 is preferably an arylene group which may have a substituent, since this provides the light-emitting element of this embodiment with superior luminous efficiency.

[0061] Ar Y1 The substituent that the group represented by the formula (I) may have is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a fluorine atom, since this provides a more excellent luminous efficiency for the light-emitting element of this embodiment. More preferably, it is an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a monovalent heterocyclic group, or a substituted amino group. Even more preferably, it is an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, or a substituted amino group. Particularly preferably, it is an alkyl group, a cycloalkyl group, or an aryl group, and these groups may further have a substituent. Ar Y1 The aryl group in the substituent that the group represented by the formula (I) may have is preferably a group in which one hydrogen atom directly bonded to an atom constituting the ring has been removed from benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene, or fluorene, since this provides a light-emitting element of this embodiment with better luminous efficiency; more preferably, a group in which one hydrogen atom directly bonded to an atom constituting the ring has been removed from benzene, phenanthrene, dihydrophenanthrene, or fluorene; and even more preferably, a phenyl group. These groups may further have a substituent. Ar Y1The monovalent heterocyclic group in the substituent that the group represented by the formula (I) may have is preferably a group in which one hydrogen atom directly bonded to an atom constituting the ring has been removed from pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, phenoxazine, phenothiazine, 9,10-dihydroacridine, or 5,10-dihydrophenazine, since the light-emitting element of this embodiment has better luminous efficiency; more preferably a group in which one hydrogen atom directly bonded to an atom constituting the ring has been removed from pyridine, diazabenzene, triazine, carbazole, dibenzofuran, dibenzothiophene, phenoxazine, or phenothiazine; and even more preferably a group in which one hydrogen atom directly bonded to an atom constituting the ring has been removed from pyridine, diazabenzene, or triazine, and these groups may further have a substituent. Ar Y1 In the substituted amino group in the substituent that the group represented by the formula (I) 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 these groups may further have a substituent. Examples and preferred ranges of the aryl group and the monovalent heterocyclic group in the substituent that the amino group has are respectively, Ar Y1 The examples and preferred ranges of the aryl group and monovalent heterocyclic group in the substituent that the group represented by the following formula (1) may have are the same as those of the aryl group and monovalent heterocyclic group in the substituent that the group represented by the following formula (1) may have.

[0062] Ar Y1 The substituent that the group represented by the formula (I) may further have is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a fluorine atom, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, still more preferably an alkyl group, a cycloalkyl group, or an aryl group, and particularly preferably an alkyl group or a cycloalkyl group. These groups may further have a substituent, but it is preferable that they do not further have a substituent. Ar Y1Examples and preferred ranges of the aryl group, monovalent heterocyclic group and substituted amino group in the substituent that may be further possessed by the substituent that may be possessed by the group represented by the formula: 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 the following formula (1) may have are the same as those of the aryl group, monovalent heterocyclic group and substituted amino group in the substituent that the group represented by the following formula (1) may have.

[0063] The structural unit represented by formula (Y) preferably includes a structural unit represented by formula (Y-1) or formula (Y-2), and more preferably a structural unit represented by formula (Y-2), since the luminous efficiency of the light-emitting element of this embodiment is superior.

[0064] [ka] [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 may have a substituent. When there are a plurality of such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. Y1 may be the same or different and may be bonded to each other to form a ring together with the carbon atom to which they are bonded. X Y1 is -C(R Y2 )2-, -C(R Y2 )=C(R Y2 )-or-C(R Y2 )2-C(R Y2 )2- represents a group represented by 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 may have a substituent. When there are a plurality of such substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. Y2may be the same or different and may be bonded to each other to form a ring together with the carbon atom to which they are bonded.

[0065] R Y1 is preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, more preferably a hydrogen atom, an alkyl group, a cycloalkyl group, or an aryl group, and even more preferably a hydrogen atom or an alkyl group, and these groups may have a substituent.

[0066] In formula (Y-1), R Y1 At least one of (preferably R Y1 At least two of the above) are preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a fluorine atom, since the luminous efficiency of the light-emitting element of this embodiment is superior, and are more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, further preferably an alkyl group, a cycloalkyl group, or an aryl group, and particularly preferably an alkyl group, and these groups may have a substituent.

[0067] 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 this provides a superior luminous efficiency to the light-emitting element of this embodiment, and is more preferably an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group, and is further preferably an alkyl group, a cycloalkyl group, or an aryl group, and these groups may have a substituent.

[0068] R Y1 and R Y2 Examples and preferred ranges of the aryl group, monovalent heterocyclic group, and substituted amino group in 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 the following formula (1) may have are the same as those of the aryl group, monovalent heterocyclic group and substituted amino group in the substituent that the group represented by the following formula (1) may have. RY1 and R Y2 Examples of the substituents that may be substituted by Ar Y1 The examples and preferred ranges of the substituents that may be possessed by the group represented by the following formula are the same as those.

[0069] X Y1 In the above, -C(R Y2 )2-, where R Y2 The combination of R is preferably such that both are alkyl groups or cycloalkyl groups, both are aryl groups, both are monovalent heterocyclic groups, or one is an alkyl group or cycloalkyl group and the other is an aryl group or 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. Y2 may be bonded to each other to form a ring together with the atoms to which they are bonded, R Y2 When forms a ring, -C(R Y2 The group represented by 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 may have a substituent.

[0070] [ka]

[0071] X Y1 In the above, -C(R Y2 )=C(R Y2 Two R in the group represented by Y2 The combination of the above is preferably such that both are alkyl groups or cycloalkyl groups, or one is an alkyl group or cycloalkyl group and the other is an aryl group, and these groups may have a substituent.

[0072] X Y1 In the above, -C(R Y2 )2-C(R Y2 )2-, where R Y2is preferably an alkyl group which may have a substituent or a cycloalkyl group which may have a substituent. Y2 may be bonded to each other to form a ring together with the atoms to which they are bonded, R Y2 When forms a ring, -C(R Y2 )2-C(R Y2 The group represented by (Y-)2- is preferably a group represented by formula (Y-B1) to formula (Y-B5), more preferably a group represented by formula (Y-B3), and these groups may have a substituent.

[0073] [ka] [In the formula, R Y2 has the same meaning as above.]

[0074] X Y1 is preferably -C(R Y2 )2- or -C(R Y2 )2-C(R Y2 )2-, and more preferably, -C(R Y2 )2- is a group represented by the formula:

[0075] Examples of the constitutional unit represented by formula (Y) include constitutional units represented by the following formula:

[0076] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka]

[0077] A structural unit represented by the formula (X) a X1 and a X2 is usually an integer from 0 to 10, and is preferably an integer from 0 to 5, more preferably an integer from 0 to 3, even more preferably an integer from 0 to 2, and particularly preferably 0 or 1, since the light-emitting element of this embodiment has better luminous efficiency.

[0078] R X1 , R X2 and R X3 is preferably an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group, more preferably an aryl group or a monovalent heterocyclic group, and even more preferably an aryl group, since the light-emitting element of this embodiment has a superior luminous efficiency. These groups may have a substituent. R X1 , R X2 and R X3 Examples and preferred ranges of the aryl group and monovalent heterocyclic group in Y1 The examples and preferred ranges of the aryl group and monovalent heterocyclic group in the substituent that may be possessed by the group represented by the following formula:

[0079] Ar X1 , Ar X2 , Ar X3 and Ar X4 Examples and preferred ranges of the arylene group and the divalent heterocyclic group in Y1 The examples and preferred ranges of the arylene group and the divalent heterocyclic group in are the same as those in the above. Ar X2 and Ar X4 In the divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded, examples and preferred ranges of the arylene group and the divalent heterocyclic group are, respectively, Ar Y1 The examples and preferred ranges of the arylene group and the divalent heterocyclic group in are the same as those in the above. Ar X2 and Ar X4 As the divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded to each other, Ar Y1 Examples of the divalent group include those similar to the divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded to each other in the above formula. Ar X1 , Ar X2 , Ar X3 and Ar X4 is preferably an arylene group which may have a substituent, since the light emitting element of this embodiment has better luminous efficiency.

[0080] Ar X1 ~Ar X4 and R X1 ~R X3 Examples of the substituents that may be possessed by the group represented by the formula (I) and the preferred range thereof are as follows: Y1 The examples and preferred ranges of the substituents that may be possessed by the group represented by the following formula are the same as those.

[0081] As the structural unit represented by formula (X), the structural units represented by formulae (X-1) to (X-7) are preferred, since the light-emitting device of this embodiment has higher luminous efficiency.

[0082] [ka] [ka] [ka] [ka] [In the formula, R X4 and R X5 Each independently 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 may have a substituent. When there are multiple substituents, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. X4 may be the same or different and may be bonded to each other to form a ring together with the atom to which they are bonded. X5 may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded.

[0083] R X4 and R X5 is preferably a hydrogen atom, 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 this provides a superior luminous efficiency to the light-emitting element of this embodiment, and is further preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, and is particularly preferably a hydrogen atom, an alkyl group, a cycloalkyl group, or an aryl group, and these groups may further have a substituent. R X4 and R X5 Examples and preferred ranges of the aryl group, monovalent heterocyclic group, and substituted amino group in 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 the following formula (1) may have are the same as those of the aryl group, monovalent heterocyclic group and substituted amino group in the substituent that the group represented by the following formula (1) may have. R X4and R X5 Examples of the substituents that may be substituted by Ar Y1 The examples and preferred ranges of the substituents that may be possessed by the group represented by the following formula are the same as those.

[0084] Examples of the constitutional unit represented by formula (X) include constitutional units represented by the following formula.

[0085] [ka] [ka] [ka] [ka] [ka] [ka] [ka]

[0086] Examples of polymer compound A include polymer compounds AP-1 to AP-4 shown in the following Table 1. Here, "others" refers to structural units other than structural unit A, the structural unit represented by formula (X), and the structural unit represented by formula (Y).

[0087] [Table 1] [In the table, p a , q a , r a and s a represents the molar ratio (mol%) of each structural unit. a +q a +r a +s a = 100 and 70≦pa +q a +r a ≦100.]

[0088] The polymer compound A may be any one of a block copolymer, a random copolymer, an alternating copolymer, a graft copolymer, or other embodiments, but is preferably a copolymer obtained by copolymerizing a plurality of raw material monomers.

[0089] Examples and preferred ranges of the number average molecular weight in polystyrene equivalent of the polymer compound A are the same as the examples and preferred ranges of the number average molecular weight in polystyrene equivalent of the first polymer compound described below. Examples and preferred ranges of the weight average molecular weight in polystyrene equivalent of the polymer compound A are the same as the examples and preferred ranges of the weight average molecular weight in polystyrene equivalent of the first polymer compound described below.

[0090] (Production method of polymer compound A) Polymer compound A can be produced by a method similar to the production method of the first polymer compound described below.

[0091] In the composition of this embodiment, the content of the polymer compound A may be within a range that allows the composition to function. In the composition of this embodiment, the content of the polymer compound A may be, for example, more than 0 mass ppm and 100 mass% or less, more than 10 mass ppm and 100 mass% or less, more than 100 mass ppm and 100 mass% or less, or more than 1000 mass ppm and 50 mass% or less, and since the light-emitting element of this embodiment has a better luminous efficiency, it is preferably more than 1000 mass ppm and 30 mass% or less, more preferably more than 2000 mass ppm and 10 mass% or less, even more preferably more than 3000 mass ppm and 5 mass% or less, particularly preferably more than 4000 mass ppm and 2 mass% or less, and particularly preferably more than 5000 mass ppm.

[0092] [Polymer compound B] The polymer compound B is a polymer compound containing a structural unit represented by formula (2). The polymer compound A is preferably a polymer compound not containing the structural unit A.

[0093] (Structural 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, a monovalent heterocyclic group, or a substituted amino group, since this provides a superior luminous efficiency to the light-emitting element of this embodiment, is more preferably an alkyl group, a cycloalkyl group, an alkoxy group, a hydroxyalkyl group, a cycloalkoxy group, an aryl group, or an aryloxy group, is even more preferably an alkyl group, a cycloalkyl group, or an aryl group, is particularly preferably an alkyl group or an aryl group, and is particularly preferably an alkyl group, and these groups may have a substituent. B 1 Examples and preferred ranges of the aryl group, monovalent heterocyclic group, and substituted amino group in 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 the following formula (1) may have are the same as those of the aryl group, monovalent heterocyclic group and substituted amino group in the substituent that the group represented by the following formula (1) may have. B 1 The hydroxyalkyl group in the formula (I) includes an alkyl group in which one of the hydrogen atoms is substituted with a hydroxy group. B 1 Examples of the substituents that may be substituted by Ar Y1 The examples and preferred ranges of the substituents that may be possessed by the group represented by the following formula are the same as those.

[0094] The number of repeating units (degree of polymerization) of the constitutional unit represented by formula (2) contained in polymer compound B is usually an integer of 5 to 10,000, and is preferably an integer of 10 to 5,000, more preferably an integer of 20 to 2,000, and even more preferably an integer of 50 to 1,000, since the light-emitting element of this embodiment has better luminous efficiency.

[0095] s is usually an integer of 0 to 10, preferably an integer of 0 to 5, more preferably an integer of 0 to 2, further preferably 0 or 1, and particularly preferably 0.

[0096] Examples of the constitutional unit represented by formula (2) include constitutional units represented by the following formula:

[0097] [ka] [ka] [ka] [ka] [ka] [ka] [ka]

[0098] The content of the structural unit represented by formula (2) contained in the polymer compound B may be within a range in which the function of the polymer compound B can be exhibited. The content of the structural unit represented by formula (2) contained in the polymer compound B is, for example, 1 to 100 mol% relative to the total content of the structural units contained in the polymer compound B. Since the light emitting device of the present embodiment has a higher luminous efficiency, the content is preferably 10 to 100 mol%, more preferably 30 to 100 mol%, even more preferably 50 to 100 mol%, particularly preferably 70 to 100 mol%, and particularly preferably 90 to 100 mol%. The structural unit represented by formula (2) may be contained in the polymer compound B in one type or in two or more types.

[0099] Polymer compound B is available from Dow Toray Co., Ltd., Shin-Etsu Chemical Co., Ltd., BYK Japan Co., Ltd., etc. Alternatively, it can be produced using known polymerization methods described in, for example, JP-T-2011-505448, JP-A-2012-68417, JP-A-2015-147930, etc.

[0100] The polymer compound B may be any one of a block copolymer, a random copolymer, an alternating copolymer, and a graft copolymer, or may be in other forms, and may be a copolymer obtained by copolymerizing a plurality of raw material monomers.

[0101] The number average molecular weight of the polymer compound B in terms of polystyrene is preferably 1×10 3 ~1×10 6 and more preferably 2×10 3 ~5×10 5 and more preferably 2×10 3 ~2×10 5 The weight average molecular weight of the polymer compound B in terms of polystyrene is preferably 2×10 3 ~2×10 6 and more preferably 5×10 3 ~1×10 6 and more preferably 5×10 3 ~5×10 5 It is.

[0102] [solvent] The solvent contained in the composition of the present embodiment (hereinafter also referred to as “ink solvent”) is not particularly limited as long as it dissolves or disperses compound A and polymer compound B and does not react with compound A and polymer compound B. The ink solvent is preferably used alone since this facilitates the production of the composition of the present embodiment, and is preferably used in combination of two or more types since this provides a higher luminous efficiency for the light-emitting element of the present embodiment. Examples of the ink solvent include chlorine-based solvents, aromatic hydrocarbon-based solvents, aromatic ether-based solvents, aliphatic hydrocarbon-based solvents, aliphatic ether-based solvents, alcohol-based solvents, ketone-based solvents, amide-based solvents, ester-based solvents, and carbonate-based solvents. Since the light-emitting element of this embodiment has a superior luminous efficiency, chlorine-based solvents, aromatic hydrocarbon-based solvents, aromatic ether-based solvents, aliphatic hydrocarbon-based solvents, aliphatic ether-based solvents, ketone-based solvents, amide-based solvents, and ester-based solvents are preferred, more preferably aromatic hydrocarbon-based solvents, aromatic ether-based solvents, aliphatic hydrocarbon-based solvents, aliphatic ether-based solvents, ketone-based solvents, and ester-based solvents, still more preferably aromatic hydrocarbon-based solvents, aromatic ether-based solvents, aliphatic hydrocarbon-based solvents, and aliphatic ether-based solvents, and particularly preferably aromatic hydrocarbon-based solvents or aromatic ether-based solvents.

[0103] When two or more types of ink solvents are used, at least one of the ink solvents is preferably a chlorine-based solvent, an aromatic hydrocarbon-based solvent, an aromatic ether-based solvent, an aliphatic hydrocarbon-based solvent, an aliphatic ether-based solvent, a ketone-based solvent, an amide-based solvent, or an ester-based solvent, since the luminous efficiency of the light-emitting element of this embodiment is superior, more preferably an aromatic hydrocarbon-based solvent, an aromatic ether-based solvent, an aliphatic hydrocarbon-based solvent, an aliphatic ether-based solvent, a ketone-based solvent, or an ester-based solvent, even more preferably an aromatic hydrocarbon-based solvent, an aromatic ether-based solvent, an aliphatic hydrocarbon-based solvent, or an aliphatic ether-based solvent, and particularly preferably an aromatic hydrocarbon-based solvent or an aromatic ether-based solvent. When two or more types of ink solvents are used, at least two of the ink solvents provide superior luminous efficiency for the light-emitting element of this embodiment, and are therefore preferably at least two selected from the group consisting of chlorine-based solvents, aromatic hydrocarbon-based solvents, aromatic ether-based solvents, aliphatic hydrocarbon-based solvents, aliphatic ether-based solvents, ketone-based solvents, amide-based solvents, and ester-based solvents, more preferably at least two selected from the group consisting of aromatic hydrocarbon-based solvents, aromatic ether-based solvents, aliphatic hydrocarbon-based solvents, aliphatic ether-based solvents, ketone-based solvents, and ester-based solvents, even more preferably at least two selected from the group consisting of aromatic hydrocarbon-based solvents, aromatic ether-based solvents, aliphatic hydrocarbon-based solvents, and aliphatic ether-based solvents, and particularly preferably at least two selected from the group consisting of aromatic hydrocarbon-based solvents and aromatic ether-based solvents. When two or more ink solvents are used, a combination of at least two of the ink solvents provides better luminous efficiency for the light-emitting element of this embodiment, and is therefore preferably a combination of one of aromatic hydrocarbon solvents and aromatic ether solvents with one of aromatic hydrocarbon solvents, aromatic ether solvents, aliphatic hydrocarbon solvents, aliphatic ether solvents, ketone solvents, amide solvents, and ester solvents, more preferably a combination of one of aromatic hydrocarbon solvents and aromatic ether solvents with one of aromatic hydrocarbon solvents, aromatic ether solvents, aliphatic hydrocarbon solvents, aliphatic ether solvents, ketone solvents, and ester solvents, and even more preferably a combination of two aromatic hydrocarbon solvents, a combination of two aromatic ether solvents, or a combination of an aromatic hydrocarbon solvent and an aromatic ether solvent.

[0104] 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, 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. Examples of the aliphatic hydrocarbon solvent 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 alcohol-based 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. Examples of ketone solvents include acetone, methyl ethyl ketone, methyl butyl ketone, dibutyl ketone, cyclohexanone, methylcyclohexanone, hexanone, octanone, nonanone, phenylacetone, acetylacetone, acetonylacetone, acetophenone, methyl naphthyl ketone, and isophorone. Examples of amide solvents include N-methylpyrrolidone, N-ethylpyrrolidone, N,N-dimethylacetamide, N,N-dimethylformamide, and 1,3-dimethyl-2-imidazolidinone. Examples of ester-based 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-ethoxypropionate, 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 solvents include dimethyl carbonate, diethyl carbonate, ethylene carbonate, and propylene carbonate.

[0105] In the composition of this embodiment, at least one of the ink solvents has a boiling point at 1 atmosphere of typically 40°C to 500°C. Since the light emitting element of this embodiment has a superior luminous efficiency, the boiling point is preferably 60°C to 450°C, more preferably 80°C to 400°C, and even more preferably 100°C to 300°C. When two or more ink solvents are used, at least one of the ink solvents has a boiling point at 1 atmosphere of preferably 100°C to 450°C, more preferably 150°C to 400°C, and even more preferably 200°C to 300°C, since this provides a superior luminous efficiency to the light-emitting element of this embodiment. When two or more ink solvents are used, the luminous efficiency of the light-emitting element of this embodiment is even better, so it is preferable that at least one of the ink solvents has a boiling point at 1 atmosphere of 60°C or more and less than 200°C, and that at least one of the ink solvents has a boiling point at 1 atmosphere of 200°C or more and 450°C or less, it is more preferable that at least one of the ink solvents has a boiling point at 1 atmosphere of 80°C or more and 195°C or less, and that at least one of the ink solvents has a boiling point at 1 atmosphere of 210°C or more and 400°C or less, and it is even more preferable that at least one of the ink solvents has a boiling point at 1 atmosphere of 100°C or more and 190°C or less, and that at least one of the ink solvents has a boiling point at 1 atmosphere of 220°C or more and 300°C or less. When two or more types of ink solvents are used, the content of the ink solvent with the smallest content among the ink solvents is preferably 1 to 50 parts by mass, more preferably 5 to 45 parts by mass, and even more preferably 10 to 40 parts by mass, relative to 100 parts by mass of the total content of the ink solvents, since this results in better luminous efficiency of the light-emitting element of this embodiment. When two or more ink solvents are used, the luminous efficiency of the light-emitting element of this embodiment is superior, and therefore the boiling point at 1 atmospheric pressure of the ink solvent contained in the smallest amount among the ink solvents is preferably 60°C or more and less than 200°C, 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 types of ink solvents are used, the content of the ink solvent with the largest content among the ink solvents is preferably 50 to 99 parts by mass, more preferably 55 to 95 parts by mass, and even more preferably 60 to 90 parts by mass when the total content of the ink solvents is taken as 100 parts by mass, since this provides better luminous efficiency of the light-emitting element of this embodiment. When two or more ink solvents are used, the luminous efficiency of the light-emitting element of this embodiment is superior, and therefore the boiling point at 1 atmospheric pressure of the ink solvent contained in the greatest amount among the ink solvents is preferably 200°C or higher and 450°C or lower, more preferably 210°C or higher and 400°C or lower, and even more preferably 220°C or higher and 300°C or lower. When two or more ink solvents are used, the number of types of ink solvents is usually 2 to 20, which makes it easier to produce the composition of the present embodiment and provides better luminous efficiency for the light-emitting element of the present embodiment. Therefore, the number of types of ink solvents is preferably 2 to 10, more preferably 2 to 5, even more preferably 2 or 3, and particularly preferably 2. When two or more ink solvents are used, the mixed solvent should be liquid at 25° C. and 1 atmospheric pressure.

[0106] [Composition (1)] The composition of the present embodiment may be a composition (hereinafter also referred to as "composition (1)") that contains at least one compound (hereinafter also referred to as "first compound") selected from the group consisting of compound A, polymer compound B, a solvent, a compound represented by formula (H-1), and polymer compounds containing at least one structural unit selected from the group consisting of structural units represented by formula (X) and structural units represented by formula (Y). That is, composition (1) is a composition that contains compound A, polymer compound B, a solvent, and the first compound. The composition (1) may contain only one kind or two or more kinds of each of the compound A, the polymer compound B, the solvent, and the first compound. The total content of compound A, polymer compound B, solvent, and first compound in composition (1) may be within a range in which the function of composition (1) can be exhibited. The total content of compound A, polymer compound B, solvent, and first compound in composition (1) may be, for example, 1 to 100% by mass based on the total amount of composition (1), and is preferably 10 to 100% by mass, more preferably 30 to 100% by mass, further preferably 50 to 100% by mass, particularly preferably 70 to 100% by mass, and particularly preferably 90 to 100% by mass, since the light emitting device of this embodiment has a higher luminous efficiency. The content of the first compound in the composition (1) may be within a range in which the function of the composition (1) can be exhibited. The total content of the first compound in the composition (1) is, for example, 0.01 to 99.9 parts by mass, assuming that the total content of the compound A and the first compound is 100 parts by mass. Since the light-emitting device of the present embodiment has a higher luminous efficiency, the total content is preferably 10 to 99 parts by mass, more preferably 20 to 98 parts by mass, even more preferably 30 to 97 parts by mass, particularly preferably 50 to 95 parts by mass, and particularly preferably 60 to 90 parts by mass.

[0107] In the composition of this embodiment (for example, composition (1)), the first compound is preferably a host material, since this provides a light-emitting device of this embodiment with superior luminous efficiency. In the composition of this embodiment (for example, composition (1)), compound A is preferably a guest material, since this leads to superior luminous efficiency of the light-emitting device of this embodiment.

[0108] In the composition of this embodiment (for example, composition (1)), the first compound (host material) is preferably a material that physically, chemically, or electrically interacts with compound A (guest material). These interactions make it possible to improve or adjust, for example, the light-emitting properties, charge transport properties, or charge injection properties of the composition of this embodiment, and the light-emitting efficiency of the light-emitting element of this embodiment is more excellent. In the composition of the present embodiment (for example, composition (1)), taking the light-emitting material as an example, the first compound (host material) and compound A (guest material) electrically interact with each other, and electric energy is efficiently transferred from the first compound (host material) to compound A (guest material), whereby the guest material can emit light more efficiently, and the light-emitting efficiency of the light-emitting element of the present embodiment is superior.

[0109] From the above viewpoints, in the composition of the present embodiment (for example, composition (1)), since the light-emitting efficiency of the light-emitting device of the present embodiment is more excellent, it is more preferable that the first compound (host material) has at least one function selected from a hole injection property, a hole transport property, an electron injection property, and an electron transport property. From the above viewpoint, in the composition of this embodiment (for example, composition (1)), it is preferable that compound A (guest material) has light-emitting properties, since the light-emitting efficiency of the light-emitting device of this embodiment is superior. From the above viewpoint, in the composition of this embodiment (for example, composition (1)), since the light-emitting element of this embodiment has a higher luminous efficiency, it is preferable that the lowest excited singlet state (S1) of the first compound (host material) has a higher energy level than the lowest excited singlet state (S1) of the compound A (guest material). From the above viewpoint, in the composition of this embodiment (for example, composition (1)), since the light-emitting efficiency of the light-emitting element of this embodiment is superior, it is preferable that the lowest excited triplet state (T1) of the first compound (host material) has a higher energy level than the lowest excited triplet state (T1) of the compound A (guest material).

[0110] Since the light-emitting device of this embodiment can be fabricated by a wet process, the first compound (host material) is preferably one that is soluble in a solvent capable of dissolving compound A (guest material).

[0111] [First compound] The first compound is at least one selected from the group consisting of a compound represented by formula (H-1) and a first polymer compound. Since the light emitting device of this embodiment has better luminous efficiency, the composition preferably contains the first compound.

[0112] The molecular weight of the compound represented by formula (H-1) is preferably 1×10 2 ~5×10 3 and more preferably 2×10 2 ~3×10 3 and more preferably 3×10 2 ~1.5×10 3 and particularly preferably 4×10 2 ~1×10 3 It is.

[0113] Ar H1and Ar H2 In order to provide a light-emitting element of this embodiment with superior luminous efficiency, the aryl group in this embodiment is preferably a group in which one hydrogen atom directly bonded to an atom constituting the ring has been removed from a monocyclic or bicyclic to pentacyclic aromatic hydrocarbon, more preferably a group in which one hydrogen atom directly bonded to an atom constituting the ring has been removed from a monocyclic or bicyclic to pentacyclic aromatic hydrocarbon, and even more preferably a group in which one hydrogen atom directly bonded to an atom constituting the ring has been removed from a monocyclic, bicyclic or tricyclic aromatic hydrocarbon, and these groups may have a substituent. Ar H1 and Ar H2 The aryl group in the formula (I) is preferably a group in which one hydrogen atom directly bonded to an atom constituting a ring has been removed from benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene, fluorene, benzoanthracene, benzophenanthrene, benzofluorene, dibenzanthracene, dibenzophenanthrene, dibenzofluorene, indenofluorene, or benzofluoranthene, since this provides the light-emitting element of this embodiment with even better light-emitting efficiency, and more preferably benzene, naphthalene, anthracene, phenanthrene, dihydro A group in which one hydrogen atom directly bonded to an atom constituting the ring has been removed from phenanthrene, fluorene, benzoanthracene, benzophenanthrene, or benzofluorene, more preferably a group in which one hydrogen atom directly bonded to an atom constituting the ring has been removed from benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene, or fluorene, particularly preferably a group in which one hydrogen atom directly bonded to an atom constituting the ring has been removed from benzene, naphthalene, or anthracene, and these groups may have a substituent.

[0114] Ar H1 and Ar H2The monovalent heterocyclic group in the formula (I) is preferably a group obtained by removing one hydrogen atom directly bonded to an atom constituting the ring from a monocyclic or bicyclic to heptacyclic heterocyclic compound, more preferably a group obtained by removing one hydrogen atom directly bonded to an atom constituting the ring from a monocyclic or bicyclic to pentacyclic heterocyclic compound, even more preferably a group obtained by removing one hydrogen atom directly bonded to an atom constituting the ring from a monocyclic, bicyclic or tricyclic heterocyclic compound, and particularly preferably a group obtained by removing one hydrogen atom directly bonded to an atom constituting the ring from a tricyclic heterocyclic compound, and these groups may have a substituent, since the light-emitting element of this embodiment has a higher luminous efficiency. Ar H1 and Ar H2In order to provide the light-emitting device of this embodiment with even better luminous efficiency, the monovalent heterocyclic group in the above formula (I) is preferably furan, thiophene, oxadiazole, thiadiazole, pyrrole, diazole, triazole, pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, benzofuran, benzothiophene, indole, azaindole, diazaindole, benzodiazole, benzothiadiazole, benzotriazole, dibenzofuran, dibenzothiophene, carbazole, azacarbazole, diazacarbazole, carbazole, phenoxazine, phenothiazine, 9,10-dihydroacridine, 5,10-dihydrophenazine, azaanthracene, diazaanthracene, azaphenanthrene, diazaphenanthrene, benzocarbazole, azabenzocarbazole, diazabenzocarbazole, benzonaphthofuran, benzonaphthothiophene, dibenzocarbazole, indolocarbazole, indenocarbazole, azaindolocarbazole, diazaindolocarbazole, azaindenocarbazole or diazaindenocarbazole and more preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, carbazole, azacarbazole, diazacarbazole, phenoxazine, phenothiazine, 9,10-dihydroacridine, 5,10-dihydrophenazine, benzocarbazole, azabenzocarbazole, diazabenzocarbazole, benzonaphthofuran, benzonaphthothiophene, dibenzocarbazo A group in which one hydrogen atom directly bonded to an atom constituting the ring has been removed from pyridine, indolocarbazole, indenocarbazole, azaindolocarbazole, diazaindenocarbazole, or diazaindenocarbazole, and more preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, carbazole, azacarbazole, diazacarbazole, phenoxazine, phenothiazine, 9,10-dihydroacridine, or 5,It is a group obtained by removing one hydrogen atom directly bonded to an atom constituting the ring from 10-dihydrophenazine, and is particularly preferably a group obtained by removing one hydrogen atom directly bonded to an atom constituting the ring from pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, or carbazole, and is particularly preferably a group obtained by removing one hydrogen atom directly bonded to an atom constituting the ring from dibenzofuran, dibenzothiophene, or carbazole, and these groups may have a substituent.

[0115] Ar H1 and Ar H2 In the substituted amino group in the above formula, the substituent of the amino group is preferably an aryl group or a monovalent heterocyclic group, more preferably an aryl group. The aryl group may further have a substituent. Examples and preferred ranges of the aryl group which is a substituent of the amino group are: Ar H1 and Ar H2 The examples and preferred range of the aryl group in Ar are the same as those in the above. The examples and preferred range of the monovalent heterocyclic group which is a substituent of the amino group are the same as those in the above. H1 and Ar H2 The examples and preferred range of the monovalent heterocyclic group in are the same as those in the above.

[0116] Since the light emitting device of this embodiment has a higher luminous efficiency, Ar H1 and Ar H2 At least one of Ar is preferably an aryl group or a monovalent heterocyclic group. H1 and Ar H2 More preferably, both of the groups are an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. Ar H1 and Ar H2As the aryl group and monovalent heterocyclic group in the above, a group in which one hydrogen atom directly bonded to an atom constituting the ring is removed from a monocyclic, bicyclic or tricyclic aromatic hydrocarbon or a monocyclic, bicyclic or tricyclic heterocyclic compound is preferred, since this provides a more excellent luminous efficiency for the light-emitting element of this embodiment; a group in which one hydrogen atom directly bonded to an atom constituting the ring is removed from benzene, naphthalene, fluorene, pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene or carbazole is more preferred; a phenyl group, naphthyl group, fluorenyl group, carbazolyl group, dibenzothienyl group or dibenzofuryl group is further preferred; and a phenyl group, naphthyl group or carbazolyl group is particularly preferred, and these groups may have a substituent.

[0117] Ar H1 and Ar H2 The substituent that may be substituted is preferably a halogen atom, a cyano group, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryloxy group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, more preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, still more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, and particularly preferably an alkyl group, a cycloalkyl group, or an aryl group, and these groups may further have a substituent. Ar H1 and Ar H2 Examples and preferred ranges of the aryl group, monovalent heterocyclic group, and substituted amino group in the substituent that may be possessed by Ar are respectively H1 and Ar H2 The examples and preferred ranges of the aryl group, monovalent heterocyclic group and substituted amino group in are the same as those in the above.

[0118] Ar H1 and Ar H2The substituent that the optionally substituted group may further have is preferably a halogen atom, a cyano group, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryloxy group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, or a substituted amino group, still more preferably an alkyl group, a cycloalkyl group, or an aryl group, and particularly preferably an alkyl group or a cycloalkyl group. These groups may further have a substituent, but it is preferable that they do not further have a substituent. Ar H1 and Ar H2 Examples and preferred ranges of the aryl group, monovalent heterocyclic group and substituted amino group in the substituent that may be further possessed by the substituent that may be possessed by Ar H1 and Ar H2 The examples and preferred ranges of the aryl group, monovalent heterocyclic group and substituted amino group in are the same as those in the above.

[0119] L H1 In the above, the divalent group is preferably an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, or -N(R 0 )-, -(O=)P(R 0 )-, a group represented by -O-, a group represented by -S-, a group represented by -S(=O)2-, or a group represented by -C(=O)-, and more preferably an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, -N(R 0 )-, a group represented by -O-, or a group represented by -S-, more preferably an alkylene group, a cycloalkylene group, an arylene group, or a divalent heterocyclic group, and particularly preferably an arylene group or a divalent heterocyclic group, and these groups may have a substituent. L H1At least one of the divalent groups in the formula (I) is preferably an alkylene group, a cycloalkylene group, an arylene group, or a divalent heterocyclic group, since the light-emitting element of this embodiment has a higher luminous efficiency, and more preferably an arylene group or a divalent heterocyclic group, and these groups may have a substituent.

[0120] L H1 In the divalent group, the arylene group is preferably a group obtained by removing two hydrogen atoms directly bonded to atoms constituting the ring from a monocyclic or bicyclic to heptacyclic aromatic hydrocarbon, since this provides a light-emitting element of this embodiment with better luminous efficiency, more preferably a group obtained by removing two hydrogen atoms directly bonded to atoms constituting the ring from a monocyclic or bicyclic to pentacyclic aromatic hydrocarbon, and even more preferably a group obtained by removing two hydrogen atoms directly bonded to atoms constituting the ring from a monocyclic, bicyclic or tricyclic aromatic hydrocarbon, and these groups may have a substituent. L H1 In the divalent group, the arylene group is preferably a group in which two hydrogen atoms directly bonded to atoms constituting a ring are removed from benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene, fluorene, benzoanthracene, benzophenanthrene, benzofluorene, dibenzoanthracene, dibenzophenanthrene, dibenzofluorene, indenofluorene, or benzofluoranthene, since this further improves the luminous efficiency of the light-emitting element of this embodiment, and more preferably benzene, naphthalene, anthracene, or phenanthrene. , dihydrophenanthrene, fluorene, benzanthracene, benzophenanthrene or benzofluorene, more preferably a group obtained by removing two hydrogen atoms directly bonded to atoms constituting the ring from benzene, naphthalene, anthracene, phenanthrene, dihydrophenanthrene or fluorene, and particularly preferably a group obtained by removing two hydrogen atoms directly bonded to atoms constituting the ring from benzene, naphthalene or anthracene, and these groups may have a substituent.

[0121] L H1In the divalent group in the above formula, the divalent heterocyclic group is preferably a group obtained by removing two hydrogen atoms directly bonded to atoms (preferably carbon atoms) constituting the ring from a monocyclic or bicyclic to heptacyclic heterocyclic compound, more preferably a group obtained by removing two hydrogen atoms directly bonded to atoms (preferably carbon atoms) constituting the ring from a monocyclic or bicyclic to pentacyclic heterocyclic compound, even more preferably a group obtained by removing two hydrogen atoms directly bonded to atoms (preferably carbon atoms) constituting the ring from a monocyclic, bicyclic or tricyclic heterocyclic compound, and particularly preferably a group obtained by removing two hydrogen atoms directly bonded to atoms (preferably carbon atoms) constituting the ring from a tricyclic heterocyclic compound, and these groups may have a substituent, since the light-emitting element of this embodiment has a higher luminous efficiency. L H1In the divalent group, the divalent heterocyclic group is preferably furan, thiophene, oxadiazole, thiadiazole, pyrrole, diazole, triazole, pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, benzofuran, benzothiophene, indole, azaindole, diazaindole, benzodiazole, benzothiadiazole, benzotriazole, dibenzofuran, dibenzothiophene, carbazole, azacarbazole, diazacazol ... azaanthracene, phenoxazine, phenothiazine, 9,10-dihydroacridine, 5,10-dihydrophenazine, azaanthracene, diazaanthracene, azaphenanthrene, diazaphenanthrene, benzocarbazole, azabenzocarbazole, diazabenzocarbazole, benzonaphthofuran, benzonaphthothiophene, dibenzocarbazole, indolocarbazole, indenocarbazole, azaindolocarbazole, diazaindolocarbazole, azaindenocarbazole, or diazaindenocarbazole. and more preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, carbazole, azacarbazole, diazacarbazole, phenoxazine, phenothiazine, 9,10-dihydroacridine, 5,10-dihydrophenazine, benzocarbazole, azabenzocarbazole, diazabenzocarbazole, benzonaphthofuran, benzonaphthothiophene, dibenzocarbazole, It is a group in which two hydrogen atoms directly bonded to atoms (preferably carbon atoms) constituting the ring are removed from indolocarbazole, indenocarbazole, azaindolocarbazole, diazaindenocarbazole, or diazaindenocarbazole, and more preferably pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, carbazole, azacarbazole, diazacarbazole, phenoxazine, phenothiazine, 9,10-dihydroacridine, or 5,It is a group obtained by removing two hydrogen atoms directly bonded to an atom (preferably a carbon atom) constituting the ring from 10-dihydrophenazine, and is particularly preferably a group obtained by removing two hydrogen atoms directly bonded to an atom (preferably a carbon atom) constituting the ring from pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, dibenzofuran, dibenzothiophene, or carbazole, and is particularly preferably a group obtained by removing two hydrogen atoms directly bonded to an atom (preferably a carbon atom) constituting the ring from dibenzofuran, dibenzothiophene, or carbazole, and these groups may have a substituent.

[0122] L H1 In the divalent group, the alkylene group is preferably a methylene group, an ethylene group or a propylene group, more preferably a methylene group, and these groups may have a substituent.

[0123] L H1 Examples of the substituents that may be substituted by Ar H1 and Ar H2 The examples and preferred ranges of the substituents which may be possessed by the group are the same as those of the substituents which may be possessed by the group.

[0124] L H1 In the divalent group, R 0 is preferably an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group, more preferably an aryl group or a monovalent heterocyclic group, and even more preferably an aryl group, and these groups may have a substituent. L H1 In the divalent group, R 0 Examples and preferred ranges of the aryl group and monovalent heterocyclic group in H1 and Ar H2 The examples and preferred ranges of the aryl group and monovalent heterocyclic group in are the same as those in the above. L H1 In the divalent group, R 0 Examples of the substituents that may be substituted by Ar H1 and Ar H2The examples and preferred ranges of the substituents which may be possessed by the group are the same as those of the substituents which may be possessed by the group.

[0125] n H1 is usually an integer of 0 or more and 10 or less, preferably an integer of 0 or more and 7 or less, more preferably an integer of 1 or more and 5 or less, even more preferably an integer of 1 or more and 3 or less, and particularly preferably 1 or 2.

[0126] Ar H1 and Ar H2 may be bonded directly or via a divalent group to form a ring, but it is preferable that they do not form a ring in order to facilitate the synthesis of the compound represented by formula (H-1). Ar H1 and Ar H2 When the ring is formed by bonding via a divalent group, the divalent group is preferably an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, -N(R 0 )-, -(O=)P(R 0 )-, -O-, -S-, -S(=O)2- or -C(=O)-, and more preferably an alkylene group, a cycloalkylene group, -N(R 0 )-, a group represented by -O-, or a group represented by -S-, and more preferably an alkylene group, a group represented by -O-, or a group represented by -S-, and these groups may have a substituent. Ar H1 and Ar H2 When L and L are bonded via a divalent group to form a ring, examples and preferred ranges of the arylene group, divalent heterocyclic group, and alkylene group in the divalent group are respectively H1 The examples and preferred ranges of the arylene group, divalent heterocyclic group and alkylene group in are the same as those in the above. Ar H1 and Ar H2 and R in the divalent group are bonded to each other to form a ring. 0 Examples and preferred ranges of L H1 R in the divalent group 0The examples and preferred ranges are the same as those of the above. Ar H1 and Ar H2 When Ar is bonded to form a ring via a divalent group, examples and preferred ranges of the substituent that the divalent group may have are: H1 and Ar H2 The examples and preferred ranges of the substituents which may be possessed by the group are the same as those of the substituents which may be possessed by the group.

[0127] L H1 and Ar H1 and may be bonded directly or via a divalent group to form a ring, but it is preferable that they do not form a ring in order to facilitate the synthesis of the compound represented by formula (H-1). H1 and Ar H1 When the ring is formed by bonding via a divalent group, examples and preferred ranges of the divalent group include Ar H1 and Ar H2 and the like are bonded via a divalent group to form a ring, and the examples and preferred range of the divalent group are the same as those of the divalent group. L H1 and Ar H2 and may be bonded directly or via a divalent group to form a ring, but it is preferable that they do not form a ring in order to facilitate the synthesis of the compound represented by formula (H-1). H1 and Ar H2 When the ring is formed by bonding via a divalent group, examples and preferred ranges of the divalent group include Ar H1 and Ar H2 and the like are bonded via a divalent group to form a ring, and the examples and preferred range of the divalent group are the same as those of the divalent group.

[0128] Examples of the compound represented by formula (H-1) include compounds represented by the following formula:

[0129] [ka] [ka] [ka] [ka]

[0130] (First polymer compound) The first polymer compound is a polymer compound that contains at least one type of constitutional unit selected from the group consisting of constitutional units represented by formula (X) and constitutional units represented by formula (Y). The first polymer compound is preferably a polymer compound different from polymer compound A and polymer compound B, and is more preferably a polymer compound that does not contain structural unit A and a structural unit represented by formula (2).

[0131] The first polymer compound preferably contains a constitutional unit represented by formula (Y), since this leads to superior luminous efficiency of the light-emitting device of this embodiment. When the first polymer compound contains a constitutional unit represented by formula (Y), the content of the constitutional unit represented by formula (Y) contained in the first polymer compound may be within a range in which the function of the first polymer compound is exhibited. When the first polymer compound contains a constitutional unit represented by formula (Y), the content of the constitutional unit represented by formula (Y) contained in the first polymer compound is, for example, 1 to 100 mol% relative to the total content of the constitutional units contained in the first polymer compound, and since the light emitting efficiency of the light emitting device of this embodiment is more excellent, it is preferably 10 to 100 mol%, more preferably 30 to 100 mol%, even more preferably 50 to 100 mol%, particularly preferably 70 to 100 mol%, and particularly preferably 90 to 100 mol%. In the first polymer compound, the constitutional unit represented by formula (Y) may be contained in the first polymer compound in one type or in two or more types.

[0132] The first polymer compound preferably contains a constitutional unit represented by formula (X), since the first polymer compound has excellent hole transport properties and the light emitting device of this embodiment has superior luminous efficiency. When the first polymer compound contains a constitutional unit represented by formula (X), the content of the constitutional unit represented by formula (X) contained in the first polymer compound may be within a range in which the function of the first polymer compound is exhibited. When the first polymer compound contains a constitutional unit represented by formula (X), the content of the constitutional unit represented by formula (X) contained in the first polymer compound is, for example, 0.01 to 100 mol% relative to the total content of constitutional units contained in the first polymer compound, and since the hole transport property of the first polymer compound is excellent and the light emitting efficiency of the light emitting element of this embodiment is more excellent, it is preferably 0.05 to 90 mol%, more preferably 0.1 to 70 mol%, even more preferably 0.2 to 50 mol%, particularly preferably 0.5 to 30 mol%, and particularly preferably 1 to 10 mol%. In the first polymer compound, the constitutional unit represented by formula (X) may be contained in the first polymer compound in one type or in two or more types.

[0133] The first polymer compound preferably contains a constitutional unit represented by formula (Y) and a constitutional unit represented by formula (X), since the first polymer compound has excellent hole transport properties and the light-emitting device of this embodiment has even better luminous efficiency. When the first polymer compound contains a constitutional unit represented by formula (Y) and a constitutional unit represented by formula (X), the total content of the constitutional unit represented by formula (Y) and the constitutional unit represented by formula (X) contained in the first polymer compound may be within a range in which the function of the first polymer compound is exhibited. When the first polymer compound contains a constitutional unit represented by formula (Y) and a constitutional unit represented by formula (X), the total content of the constitutional unit represented by formula (Y) and the constitutional unit represented by formula (X) contained in the first polymer compound is, for example, 1 to 100 mol%, and since the hole transport property of the first polymer compound is excellent and the light emitting efficiency of the light emitting device of this embodiment is further excellent, it is preferably 10 to 100 mol%, more preferably 30 to 100 mol%, even more preferably 50 to 100 mol%, particularly preferably 70 to 100 mol%, and particularly preferably 90 to 100 mol%.

[0134] Examples of the first polymer compound include polymer compounds HP-1 to HP-3 shown in Table 2 below.

[0135] [Table 2] [In the table, p, q, and r indicate the molar ratio (mol%) of each structural unit. p+q+r=100, and 100≧p+q≧70. Other structural units refer to structural units other than the structural unit represented by formula (Y) and the structural unit represented by formula (X).]

[0136] The first polymer compound may be any one of a block copolymer, a random copolymer, an alternating copolymer, a graft copolymer, or other forms, but is preferably a copolymer obtained by copolymerizing multiple types of raw material monomers. The number average molecular weight of the first polymer compound in terms of polystyrene is preferably 5×10 3 ~1×10 6 and more preferably 1×10 4 ~5×10 5 and more preferably 2×10 4 ~2×10 5 The weight average molecular weight of the first polymer compound in terms of polystyrene is preferably 1×10 4 ~2×10 6 and more preferably 2×10 4 ~1×10 6 and more preferably 5×10 4 ~5×10 5 It is.

[0137] (Method for producing the first polymer compound) The first polymer compound can be produced by using a known polymerization method described in, for example, Chem. Rev., vol. 109, pp. 897-1091 (2009), and examples of such methods include polymerization methods by coupling reactions using transition metal catalysts, such as Suzuki reaction, Yamamoto reaction, Buchwald reaction, Stille reaction, Negishi reaction, and Kumada reaction. In the above polymerization method, examples of the method for feeding the monomers include a method in which the entire amount of the monomers is fed into the reaction system all at once, a method in which a part of the monomers is fed and reacted, and then the remaining monomers are fed all at once, continuously or in portions, and a method in which the monomers are fed continuously or in portions. Examples of the transition metal catalyst include a palladium catalyst and a nickel catalyst. Post-treatment of the polymerization reaction can be carried out by any of the known methods, for example, a method of removing water-soluble impurities by liquid separation, a method of adding the reaction liquid after the polymerization reaction to a lower alcohol such as methanol, filtering the precipitate, and then drying the precipitate, either alone or in combination. When the purity of the first polymer compound is low, it can be purified by a conventional method such as recrystallization, reprecipitation, continuous extraction using a Soxhlet extractor, column chromatography, etc.

[0138] [Other ingredients] The composition of the present embodiment may be a composition containing compound A, polymer compound B, and at least one selected from the group consisting of a first compound, a hole transport material, a hole injection material, an electron transport material, an electron injection material, a light emitting material, and an antioxidant, provided that the hole transport material, the hole injection material, the electron transport material, the electron injection material, and the light emitting material are different from compound A and polymer compound B.

[0139] (Hole transport material) The hole transport material is classified into a low molecular weight compound and a high molecular weight compound. The hole transport material may have a crosslinking group. Examples of low molecular weight compounds include aromatic amine compounds such as triphenylamine and its derivatives, N,N'-di-1-naphthyl-N,N'-diphenylbenzidine (α-NPD), and N,N'-diphenyl-N,N'-di(m-tolyl)benzidine (TPD). Examples of the polymeric compound include polyvinylcarbazole and its derivatives, and polyarylene and its derivatives having an aromatic amine structure in the side chain or main chain. The polymeric compound may be a compound to which an electron-accepting site such as fullerene, tetrafluorotetracyanoquinodimethane, tetracyanoethylene, and trinitrofluorenone is bonded. In the composition of the present embodiment, when a hole transport material is contained, the content of the hole transport material is usually 1 to 10,000 parts by mass when the total content of compound A and polymer compound B is 100 parts by mass. The hole transport material may be used alone or in combination of two or more kinds.

[0140] (electron transport material) The electron transport material is classified into a low molecular weight compound and a high molecular weight compound. The electron transport material may have a crosslinking group. Examples of low molecular weight compounds include metal complexes having 8-hydroxyquinoline as a ligand, oxadiazole, anthraquinodimethane, benzoquinone, naphthoquinone, anthraquinone, tetracyanoanthraquinodimethane, fluorenone, diphenyldicyanoethylene, and diphenoquinone, as well as derivatives thereof. Examples of the polymer compound include polyphenylene, polyfluorene, and derivatives thereof. The polymer compound may be doped with a metal. In the composition of the present embodiment, when an electron transport material is contained, the content of the electron transport material is usually 1 to 10,000 parts by mass when the total content of compound A and polymer compound B is taken as 100 parts by mass. The electron transporting materials may be used alone or in combination of two or more kinds.

[0141] (Hole injection material and electron injection material) The hole injection material and the electron injection material are classified into low molecular weight compounds and high molecular weight compounds, respectively. The hole injection material and the electron injection material may have a crosslinking group. Examples of low molecular weight 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 the polymer compound include polyaniline, polythiophene, polypyrrole, polyphenylene vinylene, polythienylene vinylene, polyquinoline, polyquinoxaline, and derivatives thereof; and conductive polymers such as polymers containing an aromatic amine structure in the main chain or side chain. In the composition of the present embodiment, when a hole injection material and / or an electron injection material is contained, the content of each of the hole injection material and the electron injection material is usually 1 to 10,000 parts by mass, relative to 100 parts by mass of the total content of compound A and polymer compound B. The hole injection material and the electron injection material may each be used alone or in combination of two or more kinds.

[0142] Ion doping The hole injection material or the electron injection material may be doped with ions. For example, when the hole injection material or the electron injection material includes a conductive polymer, the electrical conductivity of the conductive polymer is preferably 1×10 -5 S / cm~1×10 3 In order to set the electrical conductivity of the conductive polymer in this range, the conductive polymer can be doped with an appropriate amount of ions. The type of ion to be doped into the hole injection material or electron injection material may be, for example, an anion for the hole injection material, or a cation for the electron injection material. Examples of the anion include polystyrene sulfonate ion, alkylbenzene sulfonate ion, and camphor sulfonate ion. Examples of the cation include lithium ion, sodium ion, potassium ion, and tetrabutylammonium ion. The doping ions may be used alone or in combination of two or more kinds.

[0143] (Light Emitting Materials) The light-emitting materials are classified into low molecular weight compounds and high molecular weight compounds. The light-emitting materials may have a crosslinking group. Examples of low molecular weight compounds include naphthalene and its derivatives, anthracene and its derivatives, perylene and its derivatives, and phosphorescent compounds having iridium, platinum, or europium as a central metal. Examples of the polymer compound include polymer compounds containing a constitutional unit represented by formula (Y) and / or a constitutional unit represented by formula (X).

[0144] Examples of the phosphorescent compound include the metal complexes shown below.

[0145] [ka] [ka]

[0146] In the composition of the present embodiment, when a light emitting material is contained, the content of the light emitting material is usually 1 to 10,000 parts by mass, assuming that the total content of compound A and polymer compound B is 100 parts by mass. The light-emitting materials may be used alone or in combination of two or more kinds.

[0147] (Antioxidants) The antioxidant may be any compound as long as it is soluble in the same solvent as compound A and polymer compound B and does not inhibit light emission and charge transport, and examples of the antioxidant include phenol-based antioxidants and phosphorus-based antioxidants. In the composition of the present embodiment, when an antioxidant is contained, the content of the antioxidant is usually 0.001 to 10 parts by mass relative to 100 parts by mass of compound A and polymer compound B. The antioxidants may be used alone or in combination of two or more kinds.

[0148] <Membrane> The film can be produced using the composition of the present embodiment by a wet method such as spin coating, casting, microgravure coating, gravure coating, bar coating, roll coating, wire bar coating, dip coating, spray coating, screen printing, flexographic printing, offset printing, inkjet printing, capillary coating, or nozzle coating. When a film is produced by a wet method using the composition of the present embodiment, the ink solvent is removed as necessary. Methods for removing the ink solvent include, for example, natural drying, vacuum drying, and heat drying, and natural drying or vacuum drying is preferred. The drying temperature is usually 0°C to 300°C, preferably 5°C to 150°C, more preferably 10°C to 75°C, and 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; however, when applied to a printing method in which a solution passes through a discharge device, such as inkjet printing, the viscosity is preferably 1 to 50 mPa s at 25°C, and more preferably 1 to 20 mPa s, since clogging and deflection during discharge are unlikely to occur. The film is suitable as a light-emitting layer in a light-emitting device. The thickness of the film is usually 1 nm to 1 μm.

[0149] <Method of manufacturing light-emitting element> The method for manufacturing a light-emitting device of 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, and includes a step of forming at least one of the organic layers by a wet method using the composition of the present embodiment. The light emitting device of this embodiment is a light emitting device having at least one organic layer formed by a wet process using the composition of this embodiment. The light-emitting device of this embodiment has, for example, electrodes consisting of an anode and a cathode, and at least one organic layer formed between the electrodes by a wet process using the composition of this embodiment. In the light-emitting device of this embodiment, the wet method may be the same as that described above in the <Film> section. In the step of forming an organic layer by a wet process using the composition of the present embodiment, the ink solvent is removed as necessary. Examples of the method for removing the ink solvent include the methods for removing the ink solvent described above in the <Film> section.

[0150] [Layer composition] The organic layer of the light-emitting element 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. At least one organic layer formed by a wet process using the composition of the present 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, preferably a light-emitting layer, a hole transport layer, or a hole injection layer, and more preferably a light-emitting layer. Each of these layers contains a light-emitting material, a hole transport material, a hole injection material, an electron transport material, and an electron injection material. Each of these layers can be formed by dissolving a light-emitting material, a hole transport material, a hole injection material, an electron transport material, and an electron injection material in the above-mentioned ink solvent, preparing a composition, and using the composition, using the same method as the preparation of the above-mentioned film.

[0151] The 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 element of the present 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, and from the viewpoint of electron injection and electron transport properties, preferably has at least one layer of an electron injection layer and an electron transport layer between the cathode and the light-emitting layer.

[0152] The hole transport layer, the electron transport layer, the light-emitting layer, the hole injection layer, and the electron injection layer can be formed using the composition of this embodiment or the above-mentioned hole transport material, electron transport material, light-emitting material, hole injection material, and electron injection material, respectively.

[0153] When the material of the hole transport layer, the material of the electron transport layer and the material of the light emitting layer are soluble in a solvent used for forming the hole transport layer, the electron transport layer and the layer adjacent to the light emitting layer in the preparation of the light emitting device, the material preferably has a crosslinking group in order to prevent the material from dissolving in the solvent. After forming each layer using a material having a crosslinking group, the layer can be insolubilized by crosslinking the crosslinking group.

[0154] In the manufacturing method of the light-emitting element of the present embodiment, the method for forming each layer such as the light-emitting layer, the hole transport layer, the electron transport layer, the hole injection layer, and the electron injection layer includes, when a low molecular weight compound is used, a dry method such as a vacuum deposition method and a wet method, and when a high molecular weight compound is used, a wet method is used.

[0155] In the light-emitting element of the present 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 in 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 element of this embodiment, the thickness of each 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 to 500 nm, and more preferably 5 nm to 150 nm. In the light-emitting element of this embodiment, the order, number and thickness of the layers to be laminated may be adjusted taking into consideration the luminance life, driving voltage and luminous efficiency of the light-emitting element.

[0156] [Substrate / electrode] The substrate in the light-emitting element may be any substrate on which an electrode can be formed and which is not chemically changed when an organic layer is formed, and may be made of a material such as glass, plastic, silicon, etc. In the case of an opaque substrate, it is preferable that the electrode furthest from the substrate is transparent or semi-transparent. Examples of materials for the anode include conductive metal oxides and translucent metals, and preferably include indium oxide, zinc oxide, and tin oxide; conductive compounds such as indium tin oxide (ITO) and indium zinc oxide; a composite of silver, palladium, and copper (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 metals; alloys of one or more of these metals with one or more of silver, copper, manganese, titanium, cobalt, nickel, tungsten, and tin; and graphite and graphite intercalation compounds. Examples of the alloys include magnesium-silver alloys, magnesium-indium alloys, magnesium-aluminum alloys, indium-silver alloys, lithium-aluminum alloys, lithium-magnesium alloys, lithium-indium alloys, and calcium-aluminum alloys. The anode and the cathode may each have a laminated structure of two or more layers.

[0157] The light-emitting element of this embodiment can be manufactured, for example, by sequentially stacking each layer on a substrate. Specifically, a light-emitting element can be manufactured by providing an anode on a substrate, providing layers such as a hole injection layer and a hole transport layer thereon, providing a light-emitting layer thereon, providing layers such as an electron transport layer and an electron injection layer thereon, and further stacking a cathode thereon. As another manufacturing method, a light-emitting element can be manufactured by providing a cathode on a substrate, providing layers such as an electron injection layer, an electron transport layer, a light-emitting layer, a hole transport layer, and a hole injection layer thereon, and further stacking an anode thereon. As yet another manufacturing method, a light-emitting element can be manufactured by facing and bonding an anode-side base material having each layer stacked on an anode or a cathode-side base material having each layer stacked on a cathode or a cathode.

[0158] [Application] The light-emitting element of this embodiment can be suitably used as a light source for backlighting of a liquid crystal display device, a light source for illumination, an organic EL illumination, a display device such as a computer, a television, or a mobile terminal (for example, an organic EL display and an organic EL television). EXAMPLES

[0159] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0160] In the examples, the polystyrene-equivalent number average molecular weight (Mn) and polystyrene-equivalent weight average molecular weight (Mw) of the polymer compound were determined by size exclusion chromatography (SEC) using tetrahydrofuran as the mobile phase under the following measurement conditions.

[0161] 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 the SEC. The mobile phase was run at a flow rate of 2.0 mL / min. The column used was PLgel MIXED-B (manufactured by Polymer Laboratories). The detector used was a UV-VIS detector (manufactured by Shimadzu Corporation, product name: SPD-10Avp).

[0162] <Synthesis Example 1> Synthesis of Compounds M1 to M7 Compound M1 was synthesized according to the method described in JP 2011-174062 A. Compound M2 was synthesized according to the method described in WO 2005 / 049546. Compound M3 was synthesized according to the method described in WO 2002 / 045184. Compound M4 was synthesized according to the method described in JP 2008-106241 A. Compounds M5 and M7 were synthesized according to the method described in JP-A-2010-189630. Compound M6 was synthesized according to the method described in WO 2012 / 086671.

[0163] [ka]

[0164] <Synthesis Example 2> Synthesis of polymer compound 1 Polymer compound 1 was synthesized using compounds M1, M2, M3 and M4 according to the method described in JP 2012-144722 A. The Mn of polymer compound 1 was 7.8 × 10 4 and Mw is 2.6×10 5 It was. Polymer compound 1 is a copolymer composed of a structural unit derived from compound M1, a structural unit derived from compound M2, a structural unit derived from compound M3, and a structural unit derived from compound M4 in a molar ratio of 50:30:12.5:7.5, according to the theoretical value calculated from the amounts of the charged raw materials.

[0165] <Synthesis Example 3> Synthesis of polymer compound 2 Polymer compound 2 was synthesized using compounds M5, M6 and M7 according to the method described in JP 2012-036388 A. Polymer compound 4 had an Mn of 9.6 × 10 4 and Mw is 2.2 × 10 5 It was. Polymer compound 2 is a copolymer composed of a structural unit derived from compound M5, a structural unit derived from compound M6, and a structural unit derived from compound M7 in a molar ratio of 50:40:10, according to the theoretical value calculated from the amounts of the charged raw materials.

[0166] Synthesis Example 4: Synthesis of phosphorescent compound E1 The phosphorescent compound E1 represented below was synthesized according to the method described in WO 2009 / 131255.

[0167] [ka]

[0168] <Synthesis Example 5> Synthesis of phosphorescent compound E2 The phosphorescent compound E2 shown below was synthesized according to the method described in JP-A-2008-179617.

[0169] [ka]

[0170] <Obtaining compound H1> Compound H1 was purchased from Luminescence Technology.

[0171] [ka]

[0172] <Comparative Example CD1> Fabrication and Evaluation of Light-Emitting Device CD1 (Formation of anode and hole injection layer) An ITO film was attached to a glass substrate by sputtering to a thickness of 45 nm to form an anode. A hole injection material, ND-3202 (manufactured by Nissan Chemical Industries, Ltd.), was formed on the anode by spin coating to a thickness of 65 nm. 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 further heated at 230°C for 15 minutes to form a hole injection layer.

[0173] (Formation of Hole Transport Layer) Polymer compound 1 was dissolved in a solvent (hereinafter also referred to as "organic solvent 1") in which cyclohexylbenzene and xylene were mixed in a mass ratio of 61.8:38.2, at a concentration of 0.6 mass % relative to the amount of organic solvent 1. Using the obtained solution, a film having a thickness of 20 nm was formed on the hole injection layer by a spin coating method, and the film was heated on a hot plate at 200°C for 30 minutes in a nitrogen gas atmosphere to form a hole transport layer.

[0174] (Formation of light-emitting layer) Polymer compound 2 and phosphorescent compound E1 (polymer compound 2 / phosphorescent compound E1=70% by mass / 30% by mass) were dissolved in organic solvent 1 at a concentration of 2.0% by mass with respect to the amount of organic solvent 1. Using the obtained solution, a film having a thickness of 85 nm was formed on the hole transport layer by a spin coating method, and the film was heated on a hot plate at 180° C. for 10 minutes in a nitrogen gas atmosphere to form a light emitting layer.

[0175] (Formation of electron injection layer and cathode) The substrate on which the light-emitting layer was formed was placed in the deposition machine and -4 After reducing the pressure to below Pa, an electron injection layer was formed by depositing 4 nm of sodium fluoride, which is an electron injection material, on the light-emitting layer, and then a cathode was formed by depositing approximately 80 nm of aluminum on the electron injection layer. After the deposition, the device was sealed with a glass substrate to produce the light-emitting device CD1.

[0176] (Evaluation of light-emitting elements) By applying a voltage to the light-emitting element CD1, EL emission was observed. 2 The luminous efficiency at was 47.6 cd / A.

[0177] Example D1: Fabrication and evaluation of light-emitting element D1 In the (formation of the light-emitting layer) of Comparative Example CD1, instead of “organic solvent 1”, “organic solvent 1 was replaced with silicone oil KF-96 1000cs (manufactured by Shin-Etsu Chemical Co., Ltd., represented by the formula (2) (wherein B 1 A light-emitting element D1 was produced in the same manner as in Comparative Example CD1, except that a solvent " was used in which a polymer compound B) having a structural unit represented by the following formula (wherein x is a methyl group and s is 0) and a degree of polymerization of 300 to 400 was mixed at a concentration of 10 ppm by mass relative to the amount of organic solvent 1. By applying a voltage to the light-emitting element D1, EL emission was observed. 2 The luminous efficiency at was 53.9 cd / A. In this case, the surface tension γ0 of organic solvent 1 at 25°C is 31.7 mN / m, and the surface tension γ 100 was 24.6 mN / m.

[0178] Example D2: Fabrication and evaluation of light-emitting element D2 Light-emitting element D2 was prepared in the same manner as in Comparative Example CD1 (formation of the light-emitting layer), except that in place of the "organic solvent 1" in Comparative Example CD1, "a solvent obtained by mixing organic solvent 1 with KF-96 1000cs (manufactured by Shin-Etsu Chemical Co., Ltd.) at a concentration of 100 ppm by mass relative to the amount of organic solvent 1" was used. By applying a voltage to the light-emitting element D2, EL emission was observed. 2 The luminous efficiency at was 54.1 cd / A.

[0179] Example D3: Fabrication and evaluation of light-emitting element D3 Light-emitting element D3 was prepared in the same manner as in Comparative Example CD1 (formation of the light-emitting layer), except that in place of the "organic solvent 1" in Comparative Example CD1, "a solvent obtained by mixing organic solvent 1 with KF-96 1000cs (manufactured by Shin-Etsu Chemical Co., Ltd.) at a concentration of 1000 ppm by mass relative to the amount of organic solvent 1" was used. By applying a voltage to the light-emitting element D3, EL emission was observed. 2 The luminous efficiency at was 50.6 cd / A.

[0180] The results of Comparative Example CD1 and Examples D1, D2 and D3 are shown in Table 3.

[0181] [Table 3]

[0182] <Comparative Example CD2> Fabrication and Evaluation of Light-Emitting Device CD2 Light-emitting element CD2 was prepared in the same manner as in Comparative Example CD1 (formation of the light-emitting layer), except that in place of "organic solvent 1" in Comparative Example CD1, "a solvent obtained by mixing organic solvent 1 with Rheodol SP-O30V (manufactured by Kao Corporation), a fatty acid ester-type nonionic surfactant, at a concentration of 10 ppm by mass relative to the amount of organic solvent 1" was used. By applying a voltage to the light-emitting element CD2, EL emission was observed. 2 The luminous efficiency at was 46.8 cd / A. In this case, the surface tension γ0 of organic solvent 1 at 25°C is 31.7 mN / m, and the surface tension γ 100 was 31.8mN / m.

[0183] <Comparative Example CD3> Fabrication and Evaluation of Light-Emitting Device CD3 Light-emitting element CD3 was prepared in the same manner as in Comparative Example CD1 (formation of the light-emitting layer), except that in place of the "organic solvent 1" in Comparative Example CD1, "a solvent obtained by mixing organic solvent 1 with Rheodol SP-O30V (manufactured by Kao Corporation), a fatty acid ester-type nonionic surfactant, at a concentration of 100 ppm by mass relative to the amount of organic solvent 1" was used. By applying a voltage to the light-emitting element CD3, EL emission was observed. 2 The luminous efficiency at was 41.7 cd / A.

[0184] <Comparative Example CD4> Fabrication and Evaluation of Light-Emitting Device CD4 Light-emitting element CD4 was prepared in the same manner as in Comparative Example CD1 (formation of the light-emitting layer), except that in place of "organic solvent 1" in Comparative Example CD1, "a solvent obtained by mixing organic solvent 1 with Rheodol SP-O30V (manufactured by Kao Corporation), a fatty acid ester-type nonionic surfactant, at a concentration of 1000 ppm by mass relative to the amount of organic solvent 1" was used. By applying a voltage to the light-emitting element CD4, EL emission was observed. 2 The luminous efficiency at was 36.0 cd / A.

[0185] The results for comparative examples CD1, CD2, CD3 and CD4 are shown in Table 4.

[0186] [Table 4]

[0187] <Comparative Example CD5> Fabrication and Evaluation of Light-Emitting Device CD5 A light-emitting device CD5 was produced in the same manner as in Comparative Example CD1, except that the hole transport layer and the light-emitting layer were formed as follows.

[0188] (Formation of Hole Transport Layer) In a solvent (hereinafter also referred to as "organic solvent 2") in which 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 1 was dissolved at a concentration of 0.6 mass% relative to the amount of organic solvent 2. Using the obtained solution, a film was formed on the hole injection layer by spin coating to a thickness of 20 nm, and the film was heated on a hot plate at 200°C for 30 minutes in a nitrogen gas atmosphere to form a hole transport layer.

[0189] [ka]

[0190] (Formation of light-emitting layer) An emitting layer was formed in the same manner as in Comparative Example CD1 (formation of an emitting layer), except that a "solution obtained by dissolving compound H1 and phosphorescent compound E2 (compound H1 / phosphorescent compound E2=90% by mass / 10% by mass) in organic solvent 2 at a concentration of 2.0% by mass relative to the amount of organic solvent 2 in organic solvent 2" was used instead of a "solution obtained by dissolving polymer compound 2 and phosphorescent compound E1 (polymer compound 2 / phosphorescent compound E1=70% by mass / 30% by mass) in organic solvent 1 at a concentration of 2.0% by mass relative to the amount of organic solvent 1 in organic solvent 1."

[0191] By applying a voltage to the light-emitting element CD5, EL emission was observed. 2 The luminous efficiency at was 6.4 cd / A.

[0192] Example D4: Fabrication and evaluation of light-emitting element D4 In the comparative example CD5 (formation of a light-emitting layer), instead of “organic solvent 2”, “organic solvent 2 was replaced with silicone oil KF-50 100cs (manufactured by Shin-Etsu Chemical Co., Ltd., represented by the formula (2) (wherein B 1 is a methyl group, and s is 0), and a structural unit represented by formula (2) (wherein B 1 A light-emitting element D4 was prepared in the same manner as in Comparative Example CD5, except that a solvent " was used in which a polymer compound B) having a structural unit represented by (wherein x is a phenyl group and s is 0) and a structural unit represented by (x is a phenyl group and s is 0) was mixed at a concentration of 10 ppm by mass with respect to the amount of organic solvent 2. By applying a voltage to the light-emitting element D4, EL emission was observed. 2 The luminous efficiency at was 8.8 cd / A. In this case, the surface tension γ0 of organic solvent 2 at 25°C is 34.8 mN / m, and the surface tension γ 100 was 27.9mN / m.

[0193] Example D5: Fabrication and evaluation of light-emitting element D5 Light-emitting element D5 was prepared in the same manner as in Comparative Example CD5 (formation of the light-emitting layer), except that in place of the "organic solvent 2" in Comparative Example CD5, "a solvent obtained by mixing organic solvent 2 with KF-50 100cs (manufactured by Shin-Etsu Chemical Co., Ltd.) at a concentration of 100 mass ppm relative to the amount of organic solvent 2" was used. By applying a voltage to the light-emitting element D5, EL emission was observed. 2 The luminous efficiency at was 8.8 cd / A.

[0194] Example D6: Fabrication and evaluation of light-emitting element D6 Light-emitting device D6 was prepared in the same manner as in Comparative Example CD5 (formation of the light-emitting layer), except that in place of the "organic solvent 2" in Comparative Example CD5, "a solvent obtained by mixing organic solvent 2 with KF-50 100cs (manufactured by Shin-Etsu Chemical Co., Ltd.) at a concentration of 1000 mass ppm relative to the amount of organic solvent 2" was used. By applying a voltage to the light-emitting element D6, EL emission was observed. 2 The luminous efficiency at was 7.8 cd / A.

[0195] The results of Comparative Example CD5 and Examples D4, D5 and D6 are shown in Table 5.

[0196] [Table 5]

[0197] Examples D1, D2, and D3 using phosphorescent compound E1 and KF-96 1000cs, and Examples D4, D5, and D6 using phosphorescent compound E2 and KF-50 100cs had excellent luminous efficiency. Phosphorescent compound E1 and phosphorescent compound E2 correspond to compound A, and KF-96 1000cs and KF-50 100cs correspond to polymer compound B. The inventors speculated that the reason why Examples D1, D2, and D3, and Examples D4, D5, and D6 have excellent luminous efficiency is because compound A and polymer compound B are used in combination. Compound A is a light-emitting material, and is preferably in a state dispersed in a host material. When a plurality of molecules of compound A are gathered (aggregated), it is considered that the excitons used for luminescence react with each other and are quenched. The present inventors speculated that because polymer compound B has high solubility in a solvent and is uniformly dissolved in the solvent, the use of compound A in combination with polymer compound B inhibits the aggregation of compound A during film formation, thereby improving the luminous efficiency. Polymer compound B has excellent chemical stability and does not deteriorate the luminous properties of an organic EL device, so it was suitable as a material to be used in combination with polymer compound A.

Claims

1. A composition containing a compound A which is a metal complex represented by formula (1), a polymer compound B which contains a constitutional unit represented by formula (2), a solvent, and a compound represented by formula (H-1), wherein the surface tension γ 0 [mN / m], and the surface tension γ at 25° C. when the solvent contains 100 ppm by mass of the polymer compound B. 100 [mN / m] and γ 0 -γ 100 > 1.0 [mN / m], and the content of the polymer compound B is more than 0 ppm by mass and 1000 ppm by mass or less relative to the solvent. 【Chemistry 1】 [In the formula, M represents a rhodium atom, a palladium atom, an iridium atom, or a platinum atom. n 1 represents an integer of 1 or more, n 2 represents an integer of 0 or more, provided that when M is a rhodium atom or an iridium atom, n 1 +n 2 is 3, and when M is a palladium atom or a platinum atom, n 1 +n 2 is 2. E 1 and E 2 Each of E independently represents a carbon atom or a nitrogen atom. 1 and E 2 When multiple are present, they may be the same or different. Ring L 1 represents a monocyclic aromatic heterocycle, and the ring may have a substituent. When a plurality of the substituents are present, they may be the same or different. Ring L 1 When multiple are present, they may be the same or different. Ring L 2 represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and these rings may have a substituent. When a plurality of the substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which each is bonded. Ring L 2 When multiple are present, they may be the same or different. Ring L 1 and a substituent that may be present on ring L 2 may be the same or different and may be bonded to each other to form a ring together with the atom to which they are bonded. However, ring L 1 and ring L 2 At least one of the above has, as a substituent, a phenyl group, or a group obtained by removing one hydrogen atom directly bonded to a carbon atom constituting the ring from a pyridine ring, a diazabenzene ring, or a triazine ring. These groups may further have a substituent. When a plurality of the substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which each is bonded. A 1 -G 1 -A 2 represents an anionic bidentate ligand. 1 and A 2 each independently represents a carbon atom, an oxygen atom, or a nitrogen atom, and these atoms may be atoms constituting a ring. 1 is a single bond, or A 1 and A 2 represents an atomic group constituting a bidentate ligand together with A. 1 -G 1 -A 2 When multiple are present, they may be the same or different. 【Chemistry 2】 [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, and these groups may have a substituent. When a plurality of such substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which each is bonded. 1 may be the same or different. s represents an integer of 0 or more. A plurality of s's may be the same or different. 【Chemistry 3】 [In the formula, Ar H1 and Ar H2 each independently represents an aryl group, a monovalent heterocyclic group, or a substituted amino group, and these groups may have a substituent. When a plurality of the substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which they are bonded. n H1 represents an integer of 1 or greater. L H1 represents a divalent group, and the group may have a substituent. When a plurality of the substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atom to which each is bonded. H1 When a plurality of groups are present, they may be the same or different and may be bonded to each other directly or via a divalent group to form a ring. However, at least one L H1 represents a group obtained by removing two hydrogen atoms directly bonded to atoms constituting the ring from a monocyclic heterocyclic compound, and the group may have a substituent. When a plurality of the substituents are present, they may be the same or different, but they do not bond to each other to form a ring together with the atoms to which they are bonded. Ar H1 and Ar H2 may be bonded directly or via a divalent group to form a ring. H1 and Ar H1 may be bonded directly or via a divalent group to form a ring. H1 and Ar H2 may be bonded directly or via a divalent group to form a ring.

2. The ring L 1 is a 5-membered aromatic heterocycle or a 6-membered aromatic heterocycle, which may have a substituent, and the ring L 2 The composition according to claim 1 , wherein is an aromatic hydrocarbon ring containing a 5-membered or 6-membered ring, or an aromatic heterocycle containing a 5-membered or 6-membered ring, and these rings may have a substituent.

3. The ring L 1 is a pyridine ring, a diazabenzene ring, a diazole ring or a triazole ring, and these rings may have a substituent, and the ring L 2 The composition according to claim 1 or 2, wherein is a benzene ring, a pyridine ring or a diazabenzene ring, and these rings may have a substituent.

4. The ring L 1 is a pyridine ring which may have a substituent, and the ring L 2 The composition according to claim 1 or 2, wherein is a benzene ring which may have a substituent.

5. B 1 The composition according to claim 1 or 2, wherein is an alkyl group or an aryl group, which may have a substituent.

6. 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 light emitting material, and an antioxidant.

7. The composition according to claim 1 or 2, wherein the solvent is an aromatic hydrocarbon solvent or an aromatic ether solvent.

8. The composition of claim 1 or 2, wherein the solvent comprises two or more solvents.

9. The composition according to claim 8 , wherein at least one of the two or more solvents is an aromatic hydrocarbon solvent or an aromatic ether solvent.

10. The composition according to claim 8, 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.

11. 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, comprising: A method for producing the light-emitting device, comprising the step of forming at least one of the organic layers by a wet process using the composition according to claim 1 .

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