JP2020010028A - Composition for organic el element - Google Patents

Abstract

To provide a composition for an organic EL element, which contains a high-molecular-weight compound and solvent, and which is useful for manufacturing a film superior in flatness in the case of manufacturing the film by coating the composition.SOLUTION: A composition for an organic EL element comprises solid contents and solvent. The solid contents include at least one main high-molecular-weight compound of 5 mass% or more to a total quantity of the solid contents, and at least one main low-molecular-weight compound of 30 mass% or more to the total quantity of the solid contents. The solvent includes at least two kinds of main solvents of 5 mass% or more to a total quantity of the solvent. A first solvent of the at least two kinds of main solvents, which is the highest in the boiling point at an atmospheric pressure, and a first high-molecular-weight compound of the at least one main high-molecular-weight compound, which is the largest in the number-average molecular weight are included in such a content proportion that the viscosity of a liquid solution consisting of the first solvent and the first high-molecular-weight compound at a temperature of 23°C becomes 1.30×10 cP or more and 1.77×10cP or less. The first high-molecular-weight compound has a weight-average molecular weight of less than 1.4×10.SELECTED DRAWING: None

Description

  The present invention relates to a composition for an organic EL device, a film formed from the composition for an organic EL composition, a method for producing the film, and an organic EL device including the film.

  An organic EL element (organic electroluminescence element) has a high luminous efficiency and a low driving voltage, and thus can be suitably used for display and lighting applications. The organic EL device includes an organic layer such as a light emitting layer and a charge transport layer. The organic layer is formed by using a composition for an organic EL device in which a polymer compound such as an organic EL material (organic electroluminescence material) is dissolved in a solvent, so that a discharge type coating method represented by an ink jet printing method can be used. It can be formed using. So far, compositions for organic EL devices have been studied.

  Japanese Patent Application Laid-Open No. 2013-026164 (Patent Document 1) discloses an organic EL material (specifically, a polymer organic EL material) and an aromatic hydrocarbon solvent as a composition for an organic EL device used in an ink jet printing method. A composition containing (specifically, cyclohexylbenzene) and an aromatic ether solvent (specifically, 4-methylanisole) is disclosed.

JP 2013-026164 A

  The present invention relates to a composition for an organic EL device, comprising a polymer compound and a solvent, which is useful for producing a film having excellent flatness when the composition is applied to produce a film. The purpose is to provide things. Another object of the present invention is to provide a film formed from the composition for an organic EL device, a method for producing the film, and an organic EL device including the film.

  The present invention provides the following composition for an organic EL device, a film, a method for producing the film, and an organic EL device.

［式（１）中、Ｒ^１は、炭素原子数が１０〜１２のアルキル基を表す。］
〔４〕 前記第１溶媒の濃度は、前記溶媒の全量に対して５質量％以上６０質量％以下である、〔１〕〜〔３〕のいずれか１項に記載の有機ＥＬ素子用組成物。
〔５〕 前記主溶媒は、第２溶媒をさらに含み、
前記第２溶媒は、式（１）で表される化合物を除く芳香族炭化水素である、〔１〕〜〔４〕のいずれか１項に記載の有機ＥＬ素子用組成物。
〔６〕 前記第２溶媒は、ペンチルベンゼン、ヘキシルベンゼン、ヘプチルベンゼン、オクチルベンゼン、ノニルベンゼン、シクロヘキシルベンゼン、及びテトラリンからなる群より選択される、〔５〕に記載の有機ＥＬ素子用組成物。
〔７〕 前記主溶媒は、第３溶媒をさらに含み、
前記第３溶媒は、芳香族エーテルである、〔１〕〜〔６〕のいずれか１項に記載の有機ＥＬ素子用組成物。
〔８〕 前記第３溶媒は、メチルアニソール、ジメチルアニソール、エチルアニソール、ブチルフェニルエーテル、ブチルアニソール、ペンチルアニソール、ヘキシルアニソール、ヘプチルアニソール、オクチルアニソール、及びフェノキシトルエンからなる群より選択される、〔７〕に記載の有機ＥＬ素子用組成物。
〔９〕 前記主高分子化合物は、いずれも重量平均分子量が３．０×１０^４以上である、〔１〕〜〔８〕のいずれか１項に記載の有機ＥＬ素子用組成物。
〔１０〕 前記第１高分子化合物は、発光性化合物である、〔１〕〜〔９〕のいずれか１項に記載の有機ＥＬ素子用組成物。
〔１１〕 温度２３℃における粘度が１ｃＰ以上１０ｃＰ以下である、〔１〕〜〔１０〕のいずれか１項に記載の有機ＥＬ素子用組成物。
〔１２〕 〔１〕〜〔１１〕のいずれか１項に記載の有機ＥＬ素子用組成物から形成される膜。
〔１３〕 〔１２〕に記載の膜を備える有機ＥＬ素子。
〔１４〕 〔１〕〜〔１１〕のいずれか１項に記載の有機ＥＬ素子用組成物を準備する準備工程と、
前記有機ＥＬ素子用組成物を塗布して塗膜を形成する塗布工程と、
前記塗膜を乾燥する乾燥工程と、を有する、膜の製造方法。
〔１５〕 前記乾燥工程は、前記塗膜を減圧雰囲気で乾燥する工程である、〔１４〕に記載の膜の製造方法。
〔１６〕 前記準備工程は、前記第１溶媒と前記第１高分子化合物とが、前記第１溶媒と前記第１高分子化合物とのみからなる前記溶液の温度２３℃における前記粘度が２．２０×１０ｃＰ以上１．７７×１０^３ｃＰ以下となるような含有比率で含まれている有機ＥＬ素子用組成物を準備する工程であり、
前記乾燥工程は、前記塗膜を温度が３０℃以上５０℃以下の減圧雰囲気で乾燥する工程である、〔１５〕に記載の膜の製造方法。
〔１７〕 前記準備工程は、前記第１溶媒と前記第１高分子化合物とが、前記第１溶媒と前記第１高分子化合物とのみからなる前記溶液の温度２３℃における前記粘度が１．３０×１０ｃＰ以上８．７０×１０^２ｃＰ以下となるような含有比率で含まれている有機ＥＬ素子用組成物を準備する工程であり、
前記乾燥工程は、前記塗膜を温度が２０℃以上３０℃未満の減圧雰囲気で乾燥する工程である、〔１５〕に記載の膜の製造方法。
〔１８〕 前記乾燥工程は、前記乾燥雰囲気を、大気圧から、１０００Ｐａ／秒以上３００００Ｐａ／秒以下の減圧速度で１０００Ｐａの圧力まで減圧する工程を含む、〔１５〕〜〔１７〕のいずれか１項に記載の膜の製造方法。 [1] A composition for an organic EL device comprising a solid content and a solvent,
The solid content includes at least one main polymer compound contained in an amount of 5% by mass or more based on the total amount of the solids, and at least one main low molecular compound contained in an amount of 30% by mass or more based on the total amount of the solids. Including a species,
The solvent includes at least two main solvents contained in an amount of 5% by mass or more based on the total amount of the solvent,
The first solvent having the highest boiling point at atmospheric pressure among the main solvents and the first polymer compound having the largest weight average molecular weight among the main polymer compounds are formed by the first solvent and the first high solvent. The solution containing only a molecular compound is contained at a content ratio such that the viscosity at a temperature of 23 ° C. is 1.30 × 10 cP or more and 1.77 × 10 ³ cP or less, and the weight-average molecular weight of the first polymer compound Is less than 1.4 × 10 ⁵ , the composition for an organic EL device.
[2] The composition for an organic EL device according to [1], wherein the first solvent has a boiling point at atmospheric pressure of 250 ° C. or higher.
[3] The composition for an organic EL device according to [1] or [2], wherein the first solvent is a compound represented by the formula (1).

[In the formula (1), R ¹ represents an alkyl group having 10 to 12 carbon atoms. ]
[4] The composition for an organic EL device according to any one of [1] to [3], wherein the concentration of the first solvent is 5% by mass or more and 60% by mass or less based on the total amount of the solvent. .
[5] the main solvent further includes a second solvent;
The composition for an organic EL device according to any one of [1] to [4], wherein the second solvent is an aromatic hydrocarbon excluding the compound represented by the formula (1).
[6] The composition for an organic EL device according to [5], wherein the second solvent is selected from the group consisting of pentylbenzene, hexylbenzene, heptylbenzene, octylbenzene, nonylbenzene, cyclohexylbenzene, and tetralin.
[7] The main solvent further includes a third solvent,
The composition for an organic EL device according to any one of [1] to [6], wherein the third solvent is an aromatic ether.
[8] The third solvent is selected from the group consisting of methylanisole, dimethylanisole, ethylanisole, butylphenylether, butylanisole, pentylanisole, hexylanisole, heptylanisole, octylanisole, and phenoxytoluene. ] The composition for an organic EL device according to [1].
[9] The composition for an organic EL device according to any one of [1] to [8], wherein each of the main polymer compounds has a weight average molecular weight of 3.0 × 10 ⁴ or more.
[10] The composition for an organic EL device according to any one of [1] to [9], wherein the first polymer compound is a luminescent compound.
[11] The composition for an organic EL device according to any one of [1] to [10], wherein a viscosity at a temperature of 23 ° C is 1 cP or more and 10 cP or less.
[12] A film formed from the composition for an organic EL device according to any one of [1] to [11].
[13] An organic EL device comprising the film according to [12].
[14] a preparation step of preparing the composition for an organic EL device according to any one of [1] to [11],
An application step of applying the composition for an organic EL element to form a coating film,
A drying step of drying the coating film.
[15] The method for producing a film according to [14], wherein the drying step is a step of drying the coating film in a reduced-pressure atmosphere.
[16] In the preparing step, the first solvent and the first polymer compound have a viscosity of 2.20 at a temperature of 23 ° C. of the solution including only the first solvent and the first polymer compound. A step of preparing a composition for an organic EL device, which is contained at a content ratio of not less than × 10 cP and not more than 1.77 × 10 ³ cP,
The method for producing a film according to [15], wherein the drying step is a step of drying the coating film in a reduced-pressure atmosphere having a temperature of 30 ° C. or more and 50 ° C. or less.
[17] In the preparing step, the first solvent and the first polymer compound may have a viscosity of 1.30 at a temperature of 23 ° C. of the solution including only the first solvent and the first polymer compound. A step of preparing a composition for an organic EL device, which is contained at a content ratio of not less than × 10 cP and not more than 8.70 × 10 ² cP,
The method for producing a film according to [15], wherein the drying step is a step of drying the coating film in a reduced-pressure atmosphere having a temperature of 20 ° C. or more and less than 30 ° C.
[18] The method according to any one of [15] to [17], wherein the drying step includes a step of reducing the pressure of the drying atmosphere from atmospheric pressure to a pressure of 1000 Pa at a pressure reduction rate of 1,000 Pa / sec or more and 30,000 Pa / sec or less. 13. The method for producing a film according to the above item.

  According to the composition for an organic EL device of the present invention, a film having excellent flatness can be produced.

It is a figure which shows the decompression control method in each decompression condition. 5 is a graph in which the viscosity x and the flatness y of the reference solution of Test Example 1 are plotted. 9 is a graph in which the viscosity x and the flatness y of the reference solution of Test Example 2 are plotted. 10 is a graph in which the viscosity x and the flatness y of the reference solution of Test Example 3 are plotted. 9 is a graph in which the viscosity x and the flatness y of the reference solution of Test Example 4 are plotted. 13 is a graph in which the viscosity x and the flatness y of the reference solution of Test Example 5 are plotted. 13 is a graph in which the viscosity x and the flatness y of the reference solution of Test Example 6 are plotted. 13 is a graph in which the viscosity x and the flatness y of the reference solution of Test Example 7 are plotted. 13 is a graph in which the viscosity x and the flatness y of the reference solution of Test Example 8 are plotted. 14 is a graph in which the viscosity x and the flatness y of the reference solution of Test Example 9 are plotted. 14 is a graph in which the viscosity x and the flatness y of the reference solution of Test Example 10 are plotted.

Terms commonly used in this specification have the following meanings unless otherwise specified.
The “polymer compound” means a polymer having a molecular weight distribution and a weight average molecular weight in terms of polystyrene of 1 × 10 ³ to 1 × 10 ⁸ . The polymer compound may be any of a block copolymer, a random copolymer, an alternating copolymer, and a graft copolymer, and may have other embodiments. The terminal group of the polymer compound is preferably a stable group because if the polymerization active group is left as it is, the light emitting characteristics or luminance life may be reduced when the polymer compound is used for manufacturing a light emitting device. It is. The terminal group is preferably a group that is conjugated to the main chain, for example, a group that is bonded to an aryl group or a monovalent heterocyclic group via a carbon-carbon bond.

“Low molecular weight compound” means a compound having no molecular weight distribution and having a molecular weight of 1 × 10 ⁴ or less.

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

[Composition for organic EL device]
The composition for an organic EL device (hereinafter, also simply referred to as “composition”) of the present invention includes a solid (hereinafter, also referred to as “solid (A)”) and a solvent (hereinafter, “solvent (B)”). ).
In the present specification, “main solvent” (hereinafter, also referred to as “main solvent (b)”) means a solvent contained in an amount of 5% by mass or more based on the total amount of the solvent (B).
In the present specification, the term “main polymer compound” (hereinafter, also referred to as “main polymer compound (a)”) refers to a polymer compound containing 5% by mass or more based on the total amount of solids (A). means.
In the present specification, the “main low-molecular compound” means a low-molecular compound contained in an amount of 30% by mass or more based on the total amount of the solid content (A).
In the present specification, the “first solvent” means a solvent having the highest boiling point at atmospheric pressure among the main solvents (b).
In the present specification, the “first polymer compound” means a polymer compound having the largest weight average molecular weight among the main polymer compounds (a). The first polymer compound has a weight average molecular weight of less than 1.4 × 10 ⁵ . The first polymer compound preferably has a weight average molecular weight of 7.0 × 10 ⁴ or more.

The composition of the present invention comprises a first solvent and a first polymer compound, and a solution at a temperature of 23 ° C. of a solution (hereinafter also referred to as a “reference solution”) consisting only of the first solvent and the first polymer compound. Is contained at a content ratio of not less than 1.30 × 10 cP and not more than 1.77 × 10 ³ cP. When the viscosity of the solution comprising only the first solvent and the first polymer compound is within the above numerical range, a film having excellent flatness can be manufactured.

  The present inventors first prepared a solution (reference solution) consisting only of the first solvent and the first polymer compound, and then prepared a composition by a method of adding other components. Correlation between the viscosity and the flatness of the manufactured film, the correlation between the viscosity of the reference solution and the flatness of the manufactured film is different depending on the drying conditions of the film, and found that if within the above numerical range. The present inventors have found that a film having excellent flatness can be manufactured under manufacturing conditions which can be generally adopted, and have led to the present invention.

<Solvent (B)>
The solvent (B) contained in the composition of the present invention contains at least two main solvents (b). Examples of the main solvent (b) include a solvent (b1) that is a compound represented by the formula (1), a solvent (b2) that is an aromatic hydrocarbon excluding the compound represented by the formula (1), and an aromatic ether. Certain solvents (b3) are preferred. The “species” of “at least two” as used herein means a kind as a compound, and means a kind of a category when each of the solvent (b1), the solvent (b2), and the solvent (b3) is a category. Not something. Therefore, for example, even when the solvent (B) contains only two different compounds belonging to the solvent (b1) as the main solvent (b), at least two types of the main solvent (b) are included. The solvent (b1), the solvent (b2), and the solvent (b3) may be contained in the solvent (B) as the main solvent (b). It may be contained as a solvent contained in less than.

［式（１）中、Ｒ^１は、炭素原子数が１０〜１２のアルキル基を表す。］ << Solvent (b1) >>
The solvent (b1) is represented by the formula (1).

[In the formula (1), R ¹ represents an alkyl group having 10 to 12 carbon atoms. ]

The alkyl group having 10 to 12 carbon atoms represented by R ¹ may be a straight-chain alkyl group or a branched alkyl group, but is preferably a straight-chain alkyl group.

R ¹ is preferably an alkyl group having 10 carbon atoms, and more preferably a linear alkyl group having 10 carbon atoms.

Examples of the alkyl group having 10 to 12 carbon atoms represented by R ¹ include a linear alkyl group such as a decyl group, an undecyl group, and a dodecyl group; a methylnonyl group, a methyldecyl group, a methylundecyl group, and dimethyloctyl. Group, dimethylnonyl group, dimethyldecyl group, trimethylheptyl group, trimethyloctyl group, trimethylnonyl group, tetramethylhexyl group, tetramethylheptyl group, tetramethyloctyl group, pentamethylhexyl group, pentamethylheptyl group, hexamethylhexyl And a branched alkyl group such as a group.A decyl group, an undecyl group, a dodecyl group, a tetramethyloctyl group, a pentamethylheptyl group or a hexamethylhexyl group is preferable, a decyl group, an undecyl group or a dodecyl group is more preferable. -Decyl group, 2-decyl , A 3-decyl group, a 4-decyl group, a 5-decyl group, a 1-undecyl group, a 2-undecyl group, a 3-undecyl group, a 1-dodecyl group, a 2-dodecyl group or a 3-dodecyl group is more preferred. , 1-decyl group, 2-decyl group and 3-decyl group are particularly preferred.

  Examples of the solvent (b1) include decylbenzene (boiling point: 293 ° C.) and dodecylbenzene (boiling point: 331 ° C.).

  The composition of the present invention may contain one kind of the solvent (b1) alone, or may contain two or more kinds of the solvent (b1).

<< Solvent (b2) >>
The solvent (b2) is an aromatic hydrocarbon excluding the compound represented by the formula (1).
The total number of carbon atoms in the solvent (b2) is preferably from 6 to 15, more preferably from 7 to 15.
The solvent (b2) preferably contains one benzene ring, more preferably benzene substituted with an alkyl group or a cycloalkyl group, having a total of 7 to 15 carbon atoms.
Examples of the solvent (b2) include toluene, xylene, trimethylbenzene, ethylbenzene, diethylbenzene, ethylmethylbenzene, propylbenzene, butylbenzene, pentylbenzene, hexylbenzene, heptylbenzene, octylbenzene, nonylbenzene, dipropylbenzene, and cyclohexyl. Benzene and tetralin are included, and the flatness of a film formed using the composition of the present invention is more excellent. Therefore, pentylbenzene, hexylbenzene, heptylbenzene, octylbenzene, nonylbenzene, cyclohexylbenzene or tetralin is preferable, and heptyl is used. Benzene, octylbenzene, nonylbenzene, cyclohexylbenzene or tetralin is more preferred, and heptylbenzene, octylbenzene, nonylbenzene is preferred. Or more preferably cyclohexyl benzene, heptyl benzene to 1-, 1-octyl benzene, 1-nonyl benzene, cyclohexylbenzene is particularly preferred.

  The composition of the present invention may contain one kind of the solvent (b2) alone, or may contain two or more kinds of the solvent (b2).

<< Solvent (b3) >>
The solvent (b3) is an aromatic ether.
The solvent (b3) preferably has 7 to 15 carbon atoms in total.
Examples of the solvent (b3) include alkylaryl ethers having a total number of carbon atoms of 7 to 15 and an aryl moiety optionally substituted with an alkyl group, and an alkyl aryl ether having a total number of carbon atoms of 12 to 15 and substituted with an alkyl group. And alkylphenyl ethers having a total number of carbon atoms of 7 to 15 and a phenyl moiety optionally substituted with an alkyl group, and an alkylphenyl ether having a total number of carbon atoms of 12 to 15 and substituted with an alkyl group. Preferred are diphenyl ethers.
Examples of the solvent (b3) include anisole, ethylphenyl ether, methylanisole, dimethylanisole, ethylanisole, butylphenylether, butylanisole, pentylanisole, hexylanisole, heptylanisole, octylanisole, 1-methoxynaphthalene, diphenylether, Phenoxytoluene is exemplified, and among these, methylanisole, dimethylanisole, ethylanisole, butylphenylether, butylanisole, pentylanisole, hexylanisole, heptylanisole, octylanisole or phenoxytoluene is preferable, and 2-methylanisole, 3-methyl Anisole, 4-methylanisole, 2,5-dimethylanisole, 2-ethylanisole, 4-ethyl More preferably anisole or 3-phenoxypropyl toluene, 2-methyl anisole, 3-methyl anisole, 4-methyl anisole or 3 phenoxytoluene is more preferable.

  The composition of the present invention may contain one kind of the solvent (b3) alone, or may contain two or more kinds of the solvent (b3).

≪Other solvents≫
The composition of the present invention may contain a solvent other than the solvent (b1), the solvent (b2), and the solvent (b3) (hereinafter, also referred to as “solvent (b4)”). The solvent (b4) may be contained as the main solvent (b) contained at 5% by mass or more based on the total amount of the solvent (B), or may be contained at less than 5% by mass based on the total amount of the solvent (B). It may be contained as a solvent other than the main solvent.

  Examples of the solvent (b4) include an aliphatic hydrocarbon solvent, a monovalent alcohol solvent, a polyhydric alcohol solvent, an ester solvent, a ketone solvent, an aliphatic ether solvent, a solvent containing a nitrogen atom, and a solvent containing a sulfur atom.

  The composition of the present invention may contain one kind of the solvent (b4) alone, or may contain two or more kinds of the solvent (b4).

<< First solvent >>
The first solvent having the highest boiling point among the main solvents (b) preferably has a boiling point at atmospheric pressure of 200 ° C. or higher. Further, the first solvent preferably has a boiling point at atmospheric pressure of 350 ° C. or lower. The first solvent is preferably the above-mentioned solvent (b1). The boiling point at atmospheric pressure of the first solvent is preferably 10 ° C. or more, which is different from the boiling point at atmospheric pressure of the solvent having the second highest boiling point at atmospheric pressure in the main solvent (b). The temperature is more preferably 20 ° C or higher, and further preferably 30 ° C or higher. The concentration of the first solvent is preferably from 5% by mass to 60% by mass, more preferably from 10% by mass to 50% by mass, based on the total amount of the main solvent (b).

組成 Solvent composition ratio≫
In one example of the solvent (B), the main solvent (b) includes the solvent (b1), the solvent (b2), and the solvent (b3), and the content of the solvent (b1): m1 (mass) and the solvent (b2) The content of m2 (mass) and the content of the solvent (b3): m3 (mass) are more excellent in flatness of a film formed using the composition of the present invention. It is preferable to satisfy 1) and (2).
0.05 ≦ m1 / (m1 + m2 + m3) ≦ 0.60 (1)
0.10 ≦ m2 / (m2 + m3) ≦ 0.90 (2)
m1 indicates the total content of the solvent (b1) when two or more solvents (b1) are contained. m2 indicates the total content of the solvent (b2) when two or more solvents (b2) are contained. m3 indicates the total content of the solvent (b3) when two or more solvents (b3) are contained.

  The solvent (B) may contain a solvent having a higher boiling point than the first solvent as long as the content is less than 5% by mass based on the total amount of the solvent (B). The solvent having a boiling point higher than that of the first solvent is preferably independently less than 1% by mass relative to the total amount of the solvent (B), and preferably less than 5% by mass in total.

<Solid content (A)>
The solid content (A) contained in the composition of the present invention contains a high molecular compound and a low molecular compound. The polymer compound contains at least one main polymer compound (a) contained in an amount of 5% by mass or more based on the total amount of the solid content (A). The content of the main polymer compound (a) is 5% by mass or more and less than 70% by mass based on the total amount of the solid content (A), and when two or more types are contained, the total content of all types is contained. Is less than 70% by mass based on the total amount of the solid content (A). The main polymer compound (a) preferably has a weight average molecular weight of 3.0 × 10 ⁴ or more.

The low molecular weight compound contains at least one main low molecular weight compound contained in an amount of 30% by mass or more based on the total amount of the solid content (A). The content of the main low-molecular compound is preferably 60% by mass or less based on the total amount of the solid content (A), and when two or more types are contained, the total content of all the types is the solid content ( It is less than 95% by weight based on the total amount of A). The main low molecular weight compound has a molecular weight of 1 × 10 ⁴ or less, and preferably 1 × 10 ² or more.

  The high molecular compound and the low molecular compound are, for example, a light emitting material, a host material, a hole transport material, a hole injection material, an electron transport material, an electron injection material, an antioxidant, and the like.

  The low molecular compound contained in the solid content (A) may be a light emitting material. When the low molecular compound is a light emitting material, it is preferably an iridium complex from the viewpoint of having excellent light emitting properties. Note that the iridium complex is not a low-molecular compound but a structural unit having a structure of the iridium complex (that is, a group formed by removing one or more hydrogen atoms directly bonded to a carbon atom or a hetero atom constituting the iridium complex). (Hereinafter, also referred to as “iridium complex constituent unit”).

≫Explanation of common terms≫
Terms commonly used below have the following meanings unless otherwise specified.

  Me represents a methyl group, Et represents an ethyl group, Bu represents a butyl group, i-Pr represents an isopropyl group, and t-Bu represents a tert-butyl group.

  The hydrogen atom may be a deuterium atom or a light hydrogen atom.

  In the formula representing the metal complex, a solid line representing a bond with the central metal means a covalent bond or a coordinate bond.

  “Structural unit” refers to a unit that is present one or more times in a polymer compound.

  “Alkyl group” may be linear or branched. The number of carbon atoms of the linear alkyl group is usually 1 to 50, preferably 3 to 30, and more preferably 4 to 20, excluding the number of carbon atoms of the substituent. The number of carbon atoms of the branched alkyl group is usually 3 to 50, preferably 3 to 30, and more preferably 4 to 20, excluding the number of carbon atoms of the substituent.

  The alkyl group may have a substituent, for example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, isoamyl group, 2-ethylbutyl group, Hexyl group, heptyl group, octyl group, 2-butyl group, 2-ethylhexyl group, 3-propylheptyl group, decyl group, 3,7-dimethyloctyl group, 2-ethyloctyl group, 2-hexyldecyl group, dodecyl group And a group in which a hydrogen atom in these groups is substituted with a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a fluorine atom, or the like, for example, a trifluoromethyl group, a pentafluoroethyl group, Fluorobutyl group, perfluorohexyl group, perfluorooctyl group, 3-phenylpropyl group, 3 (4-methylphenyl) propyl group, 3- (3,5-di - hexyl phenyl) propyl group, and 6-ethyloxy-hexyl group.

  The number of carbon atoms of the “cycloalkyl group” is usually from 3 to 50, preferably from 3 to 30, more preferably from 4 to 20, excluding the number of carbon atoms of the substituent.

  The cycloalkyl group may have a substituent, and examples thereof include a cyclohexyl group, a cyclohexylmethyl group, and a cyclohexylethyl group.

  “Aryl group” means an atomic group obtained by removing one hydrogen atom directly bonded to a carbon atom constituting a ring from an aromatic hydrocarbon. The number of carbon atoms of the aryl group is usually from 6 to 60, preferably from 6 to 20, more preferably from 6 to 10, excluding the number of carbon atoms of the substituent.

  The aryl group may have a substituent, for example, phenyl group, 1-naphthyl group, 2-naphthyl group, 1-anthracenyl group, 2-anthracenyl group, 9-anthracenyl group, 1-pyrenyl group, -Pyrenyl group, 4-pyrenyl group, 2-fluorenyl group, 3-fluorenyl group, 4-fluorenyl group, 2-phenylphenyl group, 3-phenylphenyl group, 4-phenylphenyl group, and hydrogen atoms in these groups Is a group substituted with an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a fluorine atom, or the like.

  The “alkoxy group” may be linear or branched. The number of carbon atoms of the linear alkoxy group is usually from 1 to 40, preferably from 4 to 10, excluding the number of carbon atoms of the substituent. The number of carbon atoms of the branched alkoxy group is usually from 3 to 40, preferably from 4 to 10, excluding the number of carbon atoms of the substituent.

The alkoxy group may have a substituent, for example, methoxy group, ethoxy group, propyloxy group, isopropyloxy group, butyloxy group, isobutyloxy group, tert-butyloxy group, pentyloxy group, hexyloxy group, Heptyloxy group, octyloxy group, 2-ethylhexyloxy group, nonyloxy group, decyloxy group, 3,7-dimethyloctyloxy group, lauryloxy group, and a hydrogen atom in these groups is a cycloalkyl group, an alkoxy group, Examples thereof include a cycloalkoxy group, an aryl group, and a group substituted with a fluorine atom.

  The number of carbon atoms of the "cycloalkoxy group" is usually from 3 to 40, preferably from 4 to 10, excluding the number of carbon atoms of the substituent. The cycloalkoxy group may have a substituent, for example, a cyclohexyloxy group.

  The number of carbon atoms of the "aryloxy group" is usually from 6 to 60, preferably from 6 to 48, excluding the number of carbon atoms of the substituent. The aryloxy group may have a substituent, for example, a phenoxy group, a 1-naphthyloxy group, a 2-naphthyloxy group, a 1-anthracenyloxy group, a 9-anthracenyloxy group, Examples include a pyrenyloxy group, and a group in which a hydrogen atom in these groups is substituted with an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, a fluorine atom, or the like.

  The “p-valent heterocyclic group” (p represents an integer of 1 or more) is a heterocyclic compound in which p hydrogen atoms are directly bonded to carbon atoms or hetero atoms constituting a ring. Means the remaining atomic groups except for the hydrogen atom. Among the p-valent heterocyclic groups, it is the remaining atomic group obtained by removing p hydrogen atoms among the hydrogen atoms directly bonded to the carbon atoms or hetero atoms constituting the ring from the aromatic heterocyclic compound. “P-valent aromatic heterocyclic group” is preferred.

  "Aromatic heterocyclic compound" includes oxadiazole, thiadiazole, thiazole, oxazole, thiophene, pyrrole, phosphole, furan, pyridine, pyrazine, pyrimidine, triazine, pyridazine, quinoline, isoquinoline, carbazole, dibenzophosphole Compounds in which the ring itself shows aromaticity, and heterocycles such as phenoxazine, phenothiazine, dibenzoborole, dibenzosilole, and benzopyran do not show aromaticity, but an aromatic ring is fused to the heterocycle Means a compound.

The number of carbon atoms of the monovalent heterocyclic group is usually 2 to 60, preferably 4 to 20, without including the number of carbon atoms of the substituent.
The monovalent heterocyclic group may have a substituent, for example, thienyl group, pyrrolyl group, furyl group, pyridyl group, piperidinyl group, quinolinyl group, isoquinolinyl group, pyrimidinyl group, triazinyl group, and And a group in which a hydrogen atom in the above group is substituted with an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, or the like.

  “Halogen atom” refers to a fluorine, chlorine, bromine or iodine atom.

The “amino group” may have a substituent, and a substituted amino group is preferable. As the substituent of the amino group, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group is preferable. Examples of the substituted amino group include a dialkylamino group, a dicycloalkylamino group, and a diarylamino group. Examples of the 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, and a bis (3,5-di-tert- (Butylphenyl) amino group.

  The “alkenyl group” may be linear or branched. The number of carbon atoms of the straight-chain alkenyl group is usually 2 to 30, preferably 3 to 20, without including the number of carbon atoms of the substituent. The number of carbon atoms of the branched alkenyl group is usually from 3 to 30, preferably from 4 to 20, excluding the number of carbon atoms of the substituent. The number of carbon atoms of the “cycloalkenyl group” is usually from 3 to 30, preferably from 4 to 20, excluding the number of carbon atoms of the substituent.

  The alkenyl group and the cycloalkenyl group may have a substituent, for example, 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, Examples include a pentenyl group, a 1-hexenyl group, a 5-hexenyl group, a 7-octenyl group, and a group in which these groups have a substituent.

  The “alkynyl group” may be linear or branched. The number of carbon atoms of the alkynyl group is usually 2 to 20, preferably 3 to 20, excluding the carbon atom of the substituent. The number of carbon atoms of the branched alkynyl group is usually 4 to 30, preferably 4 to 20, excluding the carbon atom of the substituent.

  The number of carbon atoms of the “cycloalkynyl group” is usually 4 to 30, preferably 4 to 20, excluding the carbon atom of the substituent.

  The alkynyl group and the cycloalkynyl group may have a substituent, for example, 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. Examples include a pentynyl group, a 1-hexynyl group, a 5-hexynyl group, and groups in which these groups have a substituent.

  The “arylene group” means an atomic group obtained by removing two hydrogen atoms directly bonded to carbon atoms constituting a ring from an aromatic hydrocarbon. The number of carbon atoms of the arylene group is usually from 6 to 60, preferably from 6 to 30, more preferably from 6 to 18, excluding the number of carbon atoms of the substituent.

  The arylene group may have a substituent, for example, a phenylene group, a naphthalenediyl group, an anthracenediyl group, a phenanthylenediyl group, a dihydrophenanthylenediyl group, a naphthacenediyl group, a fluorenediyl group, a pyrenediyl group, a perylenediyl group, Chrysenediyl groups and groups in which these groups have a substituent are mentioned, and preferred are groups represented by formulas (A-1) to (A-20). The arylene group includes a group in which a plurality of these groups are bonded.

［式中、ＲおよびＲ^ａは、それぞれ独立に、水素原子、アルキル基、シクロアルキル基、アリール基または１価の複素環基を表す。複数存在するＲおよびＲ^ａは、各々、同一でも異なっていてもよく、Ｒ^ａ同士は互いに結合して、それぞれが結合する原子と共に環を形成していてもよい。］

[Wherein, R and R ^a each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or monovalent heterocyclic group. A plurality of R and R ^a may be the same or different, and R ^a may be bonded to each other to form a ring together with the atoms to which they are bonded. ]

The number of carbon atoms of the divalent heterocyclic group is usually 2 to 60, preferably 3 to 20, more preferably 4 to 15, without including the number of carbon atoms of the substituent.
The divalent heterocyclic group may have a substituent, for example, pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, dibenzosilole, phenoxazine, phenothiazine, acridine, Dihydroacridine, furan, thiophene, azole, diazole, triazole, and a divalent group obtained by removing two hydrogen atoms among hydrogen atoms directly bonded to a carbon atom or a hetero atom constituting a ring, preferably Is a group represented by formulas (AA-1) to (AA-34). The divalent heterocyclic group includes a group in which a plurality of these groups are bonded.

［式中、ＲおよびＲ^ａは、前記と同じ意味を表す。］

[Wherein, R and ^{R a} are as defined above. ]

  The “crosslinking group” is a group capable of generating a new bond by subjecting to a heat treatment, an ultraviolet irradiation treatment, a near ultraviolet irradiation treatment, a visible light irradiation treatment, an infrared irradiation treatment, a radical reaction, and the like, Preferably, it is a group represented by any of formulas (B-1) to (B-17). These groups may have a substituent.

  "Substituent" refers to a halogen atom, cyano group, alkyl group, cycloalkyl group, aryl group, monovalent heterocyclic group, alkoxy group, cycloalkoxy group, aryloxy group, amino group, substituted amino group, alkenyl group , A cycloalkenyl group, an alkynyl group or a cycloalkynyl group. The substituent may be a crosslinking group.

≪Polymer compound≫
The polymer compound contained in the solid content (A) may be a light emitting material. When the polymer compound is a light emitting material, the structural unit represented by the formula (X) and the formula ( It is preferable that the polymer is a polymer compound containing at least one structural unit selected from the group consisting of the structural units represented by Y).

  In the composition of the present invention, one kind of a polymer compound containing at least one structural unit selected from the group consisting of a structural unit represented by the formula (X) and a structural unit represented by the formula (Y) is used. They may be contained alone or in combination of two or more.

［式中、
ａ^Ｘ１およびａ^Ｘ２は、それぞれ独立に、０以上の整数を表す。
Ａｒ^Ｘ１およびＡｒ^Ｘ３は、それぞれ独立に、アリーレン基または２価の複素環基を表し、これらの基は置換基を有していてもよい。
Ａｒ^Ｘ２およびＡｒ^Ｘ４は、それぞれ独立に、アリーレン基、２価の複素環基、または、少なくとも１種のアリーレン基と少なくとも１種の２価の複素環基とが直接結合した２価の基を表し、これらの基は置換基を有していてもよい。Ａｒ^Ｘ２およびＡｒ^Ｘ４が複数存在する場合、それらはそれぞれ同一でも異なっていてもよい。
Ｒ^Ｘ１、Ｒ^Ｘ２およびＲ^Ｘ３は、それぞれ独立に、水素原子、アルキル基、シクロアルキル基、アリール基または１価の複素環基を表し、これらの基は置換基を有していてもよい。Ｒ^Ｘ２およびＲ^Ｘ３が複数存在する場合、それらはそれぞれ同一でも異なっていてもよい。］ (Structural unit represented by formula (X))

[Where,
a ^X1 and a ^X2 each independently represent an integer of 0 or more.
Ar ^X1 and Ar ^X3 each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent.
Ar ^X2 and Ar ^X4 each independently represent an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded. And these groups may have a substituent. When a plurality of Ar ^X2 and Ar ^X4 are present, they may be the same or different.
R ^X1 , R ^X2 and R ^X3 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When a plurality of R ^X2 and R ^X3 are present, they may be the same or different. ]

a ^X1 is preferably an integer of 2 or less, and more preferably 1, because a light-emitting element having a film formed using the composition of the present invention has excellent luminous efficiency.

a ^X2 is preferably an integer of 2 or less, more preferably 0, because the light-emitting element having a film formed using the composition of the present invention has excellent luminous efficiency.

R ^X1 , R ^X2 and R ^X3 are preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and these groups have a substituent. Is also good.

The arylene group represented by Ar ^X1 and Ar ^X3 is more preferably a group represented by the formula (A-1) or (A-9), and still more preferably a group represented by the formula (A-1) And these groups may have a substituent.

The divalent heterocyclic group represented by Ar ^X1 and Ar ^X3 is more preferably represented by Formula (AA-1), Formula (AA-2) or Formula (AA-7)-(AA-26) And these groups may have a substituent.

Ar ^X1 and Ar ^X3 are preferably an arylene group optionally having a substituent.

The arylene group represented by Ar ^X2 and Ar ^X4 is more preferably the formula (A-1), the formula (A-6), the formula (A-7), the formula (A-9)-(A-11) Or a group represented by the formula (A-19), and these groups may have a substituent.

The more preferable range of the divalent heterocyclic group represented by Ar ^X2 and Ar ^X4 is the same as the more preferable range of the divalent heterocyclic group represented by Ar ^X1 and Ar ^X3 .

More preferred range of the arylene group and the divalent heterocyclic group in the divalent group in which at least one type of the arylene group represented by Ar ^X2 and Ar ^X4 is directly bonded to at least one type of the divalent heterocyclic group The more preferable ranges are the same as the more preferable ranges and the more preferable ranges of the arylene group and the divalent heterocyclic group represented by Ar ^X1 and Ar ^X3 , respectively.

Examples of the divalent group in which at least one arylene group represented by Ar ^X2 and Ar ^X4 is directly bonded to at least one divalent heterocyclic group include groups represented by the following formulas. And these may have a substituent.

［式中、Ｒ^ＸＸは、水素原子、アルキル基、シクロアルキル基、アリール基または１価の複素環基を表し、これらの基は置換基を有していてもよい。］

[Wherein, R ^XX 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. ]

R ^XX is preferably an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent.

Ar ^X2 and Ar ^X4 are preferably an arylene group optionally having a substituent.

The substituent which the groups represented by Ar ^{X1 to} Ar ^X4 and R ^{X1 to} R ^X3 may have is preferably an alkyl group, a cycloalkyl group or an aryl group, and these groups further have a substituent. It may be.

  The structural unit represented by the formula (X) is preferably a structural unit represented by the formula (X-1)-(X-7), and more preferably the formula (X-1)-(X-6) And more preferably a structural unit represented by Formulas (X-3) to (X-6).

[Wherein, R ^x4 and R ^x5 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a halogen atom, a monovalent heterocyclic group or a cyano group; Represents a group, and these groups may have a substituent. A plurality of R ^x4 may be the same or different. A plurality of R ^x5 may be the same or different, and adjacent R ^x5 may be bonded to each other to form a ring together with the carbon atom to which each is bonded. ]

  The structural unit represented by the formula (X) is the total of the structural units contained in the polymer compound from the viewpoint of excellent hole transportability of the organic EL device having the film formed using the composition of the present invention. The amount is preferably 0.1 to 50 mol%, more preferably 1 to 40 mol%, and still more preferably 5 to 30 mol% based on the amount.

  Examples of the structural unit represented by the formula (X) include structural units represented by the formulas (X1-1)-(X1-11), and preferably the formulas (X1-3)-(X1-10) ).

  The structural unit represented by the formula (X) may be contained alone or in combination of two or more in the polymer compound.

［式中、Ａｒ^Ｙ１は、アリーレン基、２価の複素環基、または、少なくとも１種のアリーレン基と少なくとも１種の２価の複素環基とが直接結合した２価の基を表し、これらの基は置換基を有していてもよい。］ (Structural unit represented by formula (Y))

[In the formula, Ar ^Y1 represents an arylene group, a divalent heterocyclic group, or a divalent group in which at least one type of arylene group and at least one type of divalent heterocyclic group are directly bonded. May have a substituent. ]

The arylene group represented by Ar ^Y1 is more preferably the formula (A-1), the formula (A-2), the formula (A-6)-(A-10), the formula (A-19) or the formula (A-19). A group represented by formula (A-20), more preferably a formula (A-1), a formula (A-2), a formula (A-7), a formula (A-9) or a formula (A-19) And these groups may have a substituent.

The divalent heterocyclic group represented by Ar ^Y1 is more preferably a compound represented by the formula (AA-1)-(AA-4), a compound represented by the formula (AA-10)-(AA-15) or a compound represented by the formula (AA-18) -A group represented by formula (AA-21), formula (AA-33) or formula (AA-34), and more preferably formula (AA-4), formula (AA-10), or formula (AA- 12), a group represented by the formula (AA-14) or the formula (AA-33), and these groups may have a substituent.

In a divalent group in which at least one kind of an arylene group represented by Ar ^Y1 and at least one kind of a divalent heterocyclic group are directly bonded, a more preferable range of the arylene group and the divalent heterocyclic group is more preferable. The ranges are the same as the more preferable range and the more preferable range of the arylene group and the divalent heterocyclic group represented by Ar ^Y1 described above.

As the divalent group in which at least one kind of arylene group represented by Ar ^Y1 and at least one kind of divalent heterocyclic group are directly bonded, at least one represented by Ar ^X2 and Ar ^X4 of the formula (X) Examples include the same divalent groups in which one kind of arylene group and at least one kind of divalent heterocyclic group are directly bonded.

The substituent which the group represented by Ar ^Y1 may have is preferably an alkyl group, a cycloalkyl group or an aryl group, and these groups may further have a substituent.

  Examples of the structural unit represented by the formula (Y) include structural units represented by the formulas (Y-1) to (Y-10), and a film formed using the composition of the present invention is From the viewpoint of the luminance life of the light-emitting element having the light-emitting element, the light-emitting element is preferably a structural unit represented by Formulas (Y-1) to (Y-3), and has a film formed using the composition of the present invention. From the viewpoint of the electron transport property, the light-emitting element having a film formed using the composition of the present invention is preferably a structural unit represented by the formula (Y-4)-(Y-7). From the viewpoint of efficiency or hole transportability, a structural unit represented by the formula (Y-8)-(Y-10) is preferable.

［式中、Ｒ^Ｙ１は、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基または１価の複素環基を表し、これらの基は置換基を有していてもよい。複数存在するＲ^Ｙ１は、同一でも異なっていてもよく、隣接するＲ^Ｙ１同士は互いに結合して、それぞれが結合する炭素原子と共に環を形成していてもよい。］

[Wherein, R ^Y1 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. . A plurality of ^RY1s may be the same or different, and adjacent ^RY1s may be bonded to each other to form a ring together with the carbon atoms to which they are bonded. ]

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

  The structural unit represented by the formula (Y-1) is preferably a structural unit represented by the formula (Y-1 ').

［式中、Ｒ^Ｙ１１は、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基または１価の複素環基を表し、これらの基は置換基を有していてもよい。
複数存在するＲ^Ｙ１１は、同一でも異なっていてもよい。］

[Wherein, R ^Y11 represents an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, or a monovalent heterocyclic group, and these groups may have a substituent.
A plurality of ^RY11s may be the same or different. ]

R ^Y11 is preferably an alkyl group, a cycloalkyl group or an aryl group, more preferably an alkyl group or a cycloalkyl group, and these groups may have a substituent.

［式中、
Ｒ^Ｙ１は、前記と同じ意味を表す。
Ｘ^Ｙ１は、−Ｃ(Ｒ^Ｙ２)_２−、−Ｃ(Ｒ^Ｙ２)＝Ｃ(Ｒ^Ｙ２)−または−Ｃ(Ｒ^Ｙ２)_２−Ｃ(Ｒ^Ｙ２)_２−で表される基を表す。Ｒ^Ｙ２は、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基または１価の複素環基を表し、これらの基は置換基を有していてもよい。複数存在するＲ^Ｙ２は、同一でも異なっていてもよく、Ｒ^Ｙ２同士は互いに結合して、それぞれが結合する炭素原子と共に環を形成していてもよい。］

[Where,
R ^Y1 represents the same meaning as described above.
X ^{Y1 _{is, -C (R Y2) 2 -}} , - represents a group represented by ^{- C (R Y2) = C} (R Y2) - or _{^{-C (R Y2) 2 -C (}} R Y2) 2. R ^Y2 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. A plurality of ^RY2s may be the same or different, and ^RY2s may be bonded to each other to form a ring together with the carbon atoms to which they are bonded. ]

R ^Y2 is preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an alkyl group, a cycloalkyl group or an aryl group, and these groups have a substituent. It may be.

In ^{X Y1, -C (R Y2)} 2 - 2 pieces of combinations of R ^Y2 in the group represented by is preferably both an alkyl group or a cycloalkyl group, both an aryl group, both monovalent heterocyclic A ring group, or one of which is an alkyl group or a cycloalkyl group and the other is an aryl group or a monovalent heterocyclic group, more preferably one is an alkyl group or a cycloalkyl group and the other is an aryl group; May have a substituent. 2 to R ^Y2, taken together present, each may form a ring together with the binding atoms, if R ^Y2 form a ring, -C (R ^Y2) ₂ - as a group represented by Is preferably a group represented by the formula (Y-A1)-(Y-A5), more preferably a group represented by the formula (Y-A4), and these groups have a substituent. May be.

In ^XY1 , the combination of two RY2 in the group represented by -C ( ^RY2 ) = C ( ^RY2 ) ^-is preferably an alkyl group or a cycloalkyl group, or one of them is an alkyl group. Alternatively, the other is a cycloalkyl group and an aryl group, and these groups may have a substituent.

In ^{X Y1, -C (R Y2)} 2 -C (R Y2) 2 - 4 pieces of ^{R Y2} in the group represented by is preferably an optionally substituted alkyl group or a cycloalkyl group It is. A plurality of ^RY2s may be bonded to each other to form a ring together with the atoms to which they are bonded, and when ^RY2 forms a ring, -C ( ^RY2 ) _2- C ( ^RY2 ) _2- The group represented by the formula is preferably a group represented by the formula (Y-B1)-(Y-B5), more preferably a group represented by the formula (Y-B3). It may have a group.

［式中、Ｒ^Ｙ２は前記と同じ意味を表す。］

[Wherein, R ^Y2 represents the same meaning as described above. ]

  The structural unit represented by the formula (Y-2) is preferably a structural unit represented by the formula (Y-2 ').

［式中、Ｒ^Ｙ１およびＸ^Ｙ１は、前記と同じ意味を表す。］

[Wherein, R ^Y1 and X ^Y1 represent the same meaning as described above. ]

［式中、Ｒ^Ｙ１およびＸ^Ｙ１は、前記と同じ意味を表す。］

[Wherein, R ^Y1 and X ^Y1 represent the same meaning as described above. ]

  The structural unit represented by the formula (Y-3) is preferably a structural unit represented by the formula (Y-3 ').

［式中、Ｒ^Ｙ１１およびＸ^Ｙ１は、前記と同じ意味を表す。］

[Wherein, R ^Y11 and X ^Y1 represent the same meaning as described above. ]

［式中、
Ｒ^Ｙ１は、前記と同じ意味を表す。
Ｒ^Ｙ３は、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基または１価の複素環基を表し、これらの基は置換基を有していてもよい。］

[Where,
R ^Y1 represents the same meaning as described above.
R ^Y3 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. ]

R ^Y3 is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and these groups have a substituent. You may.

  The structural unit represented by the formula (Y-4) is preferably a structural unit represented by the formula (Y-4 ′), and the structural unit represented by the formula (Y-6) is represented by the formula (Y-4) The structural unit represented by -6 ′) is preferable.

［式中、Ｒ^Ｙ１およびＲ^Ｙ３は、前記と同じ意味を表す。］

[Wherein, R ^Y1 and R ^Y3 represent the same meaning as described above. ]

［式中、
Ｒ^Ｙ１は、前記を同じ意味を表す。
Ｒ^Ｙ４は、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基または１価の複素環基を表し、これらの基は置換基を有していてもよい。］

[Where,
R ^Y1 represents the same meaning as described above.
R ^Y4 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. ]

R ^Y4 is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and these groups have a substituent. You may.

  As the structural unit represented by the formula (Y), for example, a structural unit composed of an arylene group represented by the formula (Y-101)-(Y-121) or the formula (Y-201)-(Y-206) A structural unit comprising a divalent heterocyclic group represented by the formula: wherein at least one arylene group represented by the formula (Y-301)-(Y-304) and at least one divalent heterocyclic group are Structural units composed of a divalent group directly bonded are exemplified.

A structural unit represented by the formula (Y), wherein Ar ^Y1 is an arylene group, has a high luminance life of an organic EL device having a film formed using the composition of the present invention, It is preferably from 0.5 to 90 mol%, more preferably from 30 to 80 mol%, based on the total amount of the structural units contained in the molecular compound.

A structural unit represented by the formula (Y), wherein Ar ^Y1 is a divalent heterocyclic group, or a divalent group in which at least one kind of arylene group and at least one kind of divalent heterocyclic group are directly bonded. The structural unit is a group of the structural unit contained in the polymer compound because the organic EL device having a film formed using the composition of the present invention has excellent luminous efficiency, hole transporting property, or electron transporting property. It is preferably 0.5 to 50 mol%, more preferably 3 to 30 mol%, based on the total amount.

  The structural unit represented by the formula (Y) may be contained alone or in combination of two or more in the polymer compound.

  Examples of the polymer compound include the polymer compounds (P-101) to (P-107) shown in Table 1.

［表中、ｐ、ｑ、ｒ、ｓおよびｔは、各構成単位のモル比率を示す。ｐ＋ｑ＋ｒ＋ｓ＋ｔ＝１００であり、かつ、１００≧ｐ＋ｑ＋ｒ＋ｓ≧７０である。その他の構成単位とは、
式(Ｙ)で表される構成単位、式(Ｘ)で表される構成単位以外の構成単位を意味する。］

[In the table, p, q, r, s and t indicate the molar ratio of each structural unit. p + q + r + s + t = 100, and 100 ≧ p + q + r + s ≧ 70. Other constituent units are
It means a structural unit represented by the formula (Y) and a structural unit other than the structural unit represented by the formula (X). ]

When only a polymer compound containing at least one kind of structural unit selected from the group consisting of the structural unit represented by the formula (X) and the structural unit represented by the formula (Y) is used as a light-emitting material (that is, as described later) When other light emitting materials such as iridium complex are not used together),
As a polymer compound,
At least one structural unit selected from the group consisting of a structural unit represented by the formula (Y-8), a structural unit represented by the formula (Y-9), and a structural unit represented by the formula (Y-10) It is preferably a polymer compound containing
More preferably, it is a polymer compound containing at least one structural unit selected from the group consisting of a structural unit represented by the formula (Y-8) and a structural unit represented by the formula (Y-9),
More preferably, it is a polymer compound containing a structural unit represented by the formula (Y-8).

In addition, as the high molecular compound, structural units other than the structural unit represented by the formula (Y-8), the structural unit represented by the formula (Y-9), and the structural unit represented by the formula (Y-10) As
From the structural unit represented by the formula (Y-1), the structural unit represented by the formula (Y-2), the structural unit represented by the formula (Y-3), and the structural unit represented by the formula (X) It is preferably a polymer compound containing at least one structural unit selected from the group consisting of:
Including at least one structural unit selected from the group consisting of a structural unit represented by the formula (Y-1), a structural unit represented by the formula (Y-2), and a structural unit represented by the formula (X) More preferably a polymer compound,
More preferably, it is a polymer compound containing at least one structural unit selected from the group consisting of the structural unit represented by the formula (Y-2) and the structural unit represented by the formula (X),
It is particularly preferable that the polymer be a polymer compound containing a structural unit represented by the formula (Y-2) and a structural unit represented by the formula (X).

≫Production method of polymer compound≫
Polymer compounds containing at least one structural unit selected from the group consisting of the structural unit represented by the formula (X) and the structural unit represented by the formula (Y) can be obtained from Chemical Review (Chem. Rev.), 109, 897-1091 (2009) and the like, and can be produced by a transition metal catalyst such as a Suzuki reaction, a Yamamoto reaction, a Buchwald reaction, a Stille reaction, a Negishi reaction, and a Kumada reaction. A method of polymerizing by a coupling reaction using is exemplified.

  In the polymerization method, as a method of charging the monomers, a method of charging the entire amount of the monomers to the reaction system at once, charging a part of the monomers and reacting them, and then collecting the remaining monomers at once, A method of charging continuously or dividedly, a method of charging monomers continuously or dividedly, and the like can be mentioned.

  Examples of the transition metal catalyst include a palladium catalyst and a nickel catalyst.

  The post-treatment of the polymerization reaction is a known method, for example, a method of removing water-soluble impurities by liquid separation, adding the reaction solution after the polymerization reaction to a lower alcohol such as methanol, filtering the deposited precipitate, and then drying. These methods are performed alone or in combination. When the purity of the polymer compound is low, it can be purified by an ordinary method such as recrystallization, reprecipitation, continuous extraction with a Soxhlet extractor, column chromatography, and the like.

≪Iridium complex≫
Since the iridium complex is more excellent in the luminous efficiency of the organic EL device having the film formed using the composition of the present invention, the iridium complex is represented by the formula (Ir-1) and the iridium complex represented by the formula (Ir-2). The iridium complex represented by the formula (Ir-3), the iridium complex represented by the formula (Ir-4) or the iridium complex represented by the formula (Ir-5) is preferable. The iridium complex represented by (Ir-1), the iridium complex represented by the formula (Ir-2) or the iridium complex represented by the formula (Ir-3) is more preferable.

［式中、
ｎ^Ｄ１は、１、２または３を表す。ｎ^Ｄ２は、１または２を表す。
Ｒ^Ｄ１、Ｒ^Ｄ２、Ｒ^Ｄ３、Ｒ^Ｄ４、Ｒ^Ｄ５、Ｒ^Ｄ６、Ｒ^Ｄ７、Ｒ^Ｄ８、Ｒ^Ｄ１１、Ｒ^Ｄ１２、Ｒ^Ｄ１３、Ｒ^Ｄ１４、Ｒ^Ｄ１５、Ｒ^Ｄ１６、Ｒ^Ｄ１７、Ｒ^Ｄ１８、Ｒ^Ｄ１９、Ｒ^Ｄ２０、Ｒ^Ｄ２１、Ｒ^Ｄ２２、Ｒ^Ｄ２３、Ｒ^Ｄ２４、Ｒ^Ｄ２５、Ｒ^Ｄ２６、Ｒ^Ｄ３１、Ｒ^Ｄ３２、Ｒ^Ｄ３３、Ｒ^Ｄ３４、Ｒ^Ｄ３５、Ｒ^Ｄ３６およびＲ^Ｄ３７は、それぞれ独立に、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基、アリールオキシ基、１価の複素環基またはハロゲン原子を表し、これらの基は置換基を有していてもよい。Ｒ^Ｄ１、Ｒ^Ｄ２、Ｒ^Ｄ３、Ｒ^Ｄ４、Ｒ^Ｄ５、Ｒ^Ｄ６、Ｒ^Ｄ７、Ｒ^Ｄ８、Ｒ^Ｄ１１、Ｒ^Ｄ１２、Ｒ^Ｄ１３、Ｒ^Ｄ１４、Ｒ^Ｄ１５、Ｒ^Ｄ１６、Ｒ^Ｄ１７、Ｒ^Ｄ１８、Ｒ^Ｄ１９、Ｒ^Ｄ２０、Ｒ^Ｄ２１、Ｒ^Ｄ２２、Ｒ^Ｄ２３、Ｒ^Ｄ２４、Ｒ^Ｄ２５、Ｒ^Ｄ２６、Ｒ^Ｄ３１、Ｒ^Ｄ３２、Ｒ^Ｄ３３、Ｒ^Ｄ３４、Ｒ^Ｄ３５、Ｒ^Ｄ３６およびＲ^Ｄ３７が複数存在する場合、それらはそれぞれ同一でも異なっていてもよい。
−Ａ^Ｄ１---Ａ^Ｄ２−は、アニオン性の２座配位子を表す。Ａ^Ｄ１およびＡ^Ｄ２は、そ
れぞれ独立に、イリジウム原子と結合する炭素原子、酸素原子または窒素原子を表し、これらの原子は環を構成する原子であってもよい。−Ａ^Ｄ１---Ａ^Ｄ２−が複数存在する場
合、それらは同一でも異なっていてもよい。］

[Where,
n ^D1 represents 1, 2 or 3. n ^D2 represents 1 or 2.
^{R D1, R D2, R D3} , R D4, R D5, R D6, R D7, R D8, R D11, R D12, R D13, R D14, R D15, R D16, R D17, R D18, R D19 ^{, R D20, R D21, R} D22, R D23, R D24, R D25, R D26, R D31, R D32, R D33, R D34, R D35, R D36 and ^{R D37} each independently represent 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 or a halogen atom, and these groups may have a substituent. ^{R D1, R D2, R D3} , R D4, R D5, R D6, R D7, R D8, R D11, R D12, R D13, R D14, R D15, R D16, R D17, R D18, R D19 ^{, R D20, R D21, R} D22, R D23, R D24, R D25, R D26, R D31, R D32, R D33, R D34, R D35, ^{if R D36} and ^{R D37} there are a plurality, they Each may be the same or different.
-A ^D1 --- ^{A D2} - represents a bidentate ligand of the anionic. A ^D1 and A ^D2 each independently represent a carbon atom, an oxygen atom or a nitrogen atom bonded to an iridium atom, and these atoms may be atoms constituting a ring. When there are a plurality of -A ^D1 --- A ^D2- , they may be the same or different. ]

In the iridium complex represented by the formula (Ir-1), at least one of R ^{D1 to} R ^D8 is preferably a group represented by the formula (DA).

In the iridium complex represented by the formula (Ir-2), preferably, at least one of R ^{D11 to} R ^D20 is a group represented by the formula (DA).

In the iridium complex represented by the formula (Ir-3), preferably at least one of ^R D1 ^{to R D8} and ^R D11 ^{to R D20} is a group represented by the formula (D-A).

In the iridium complex represented by the formula (Ir-4), preferably, at least one of R ^{D21 to} R ^D26 is a group represented by the formula (DA).

In the iridium complex represented by the formula (Ir-5), preferably at least one of ^R D31 ^{to R D37} is a group represented by the formula (D-A).

［式中、
ｍ^ＤＡ１、ｍ^ＤＡ２およびｍ^ＤＡ３は、それぞれ独立に、０以上の整数を表す。
Ｇ^ＤＡは、窒素原子、芳香族炭化水素基または複素環基を表し、これらの基は置換基を有していてもよい。
Ａｒ^ＤＡ１、Ａｒ^ＤＡ２およびＡｒ^ＤＡ３は、それぞれ独立に、アリーレン基または２価の複素環基を表し、これらの基は置換基を有していてもよい。Ａｒ^ＤＡ１、Ａｒ^ＤＡ２およびＡｒ^ＤＡ３が複数存在する場合、それらはそれぞれ同一でも異なっていてもよい。
Ｔ^ＤＡは、アリール基または１価の複素環基を表し、これらの基は置換基を有していてもよい。複数存在するＴ^ＤＡは、同一でも異なっていてもよい。］

[Where,
m ^DA1 , m ^DA2 and m ^DA3 each independently represent an integer of 0 or more.
^GDA represents a nitrogen atom, an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent.
Ar ^DA1 , Ar ^DA2 and Ar ^DA3 each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When a plurality of Ar ^DA1 , Ar ^DA2 and Ar ^DA3 are present, they may be the same or different.
^TDA represents an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. The plurality of ^TDAs may be the same or different. ]

m ^DA1 , m ^DA2 and m ^DA3 are usually integers of 10 or less, preferably 5 or less, and more preferably 0 or 1. It is preferable that m ^DA1 , m ^DA2 and m ^DA3 are the same integer.

G ^DA is preferably a group represented by the formula (GDA-11) ~ (GDA -15), these groups may have a substituent.

［式中、
＊、＊＊および＊＊＊は、各々、Ａｒ^ＤＡ１、Ａｒ^ＤＡ２、Ａｒ^ＤＡ３との結合を表す。
Ｒ^ＤＡは、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基または１価の複素環基を表し、これらの基は更に置換基を有していてもよい。Ｒ^ＤＡが複数存在する場合、それらは同一でも異なっていてもよい。］

[Where,
*, ** and *** represent a bond to Ar ^DA1 , Ar ^DA2 and Ar ^DA3 , respectively.
R ^DA represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may further have a substituent. When a plurality of R ^DAs are present, they may be the same or different. ]

R ^DA is preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group or a cycloalkoxy group, more preferably a hydrogen atom, an alkyl group or a cycloalkyl group, and these groups have a substituent. You may.

Ar ^DA1 , Ar ^DA2 and Ar ^DA3 are preferably groups represented by formulas (ArDA-1) to (ArDA-3).

［式中、
Ｒ^ＤＡは、前記と同じ意味を表す。
Ｒ^ＤＢは、水素原子、アルキル基、シクロアルキル基、アリール基または１価の複素環基を表し、これらの基は置換基を有していてもよい。Ｒ^ＤＢが複数存在する場合、それらは同一でも異なっていてもよい。］

[Where,
R ^DA has the same meaning as described above.
R ^DB 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 R ^DBs exist, they may be the same or different. ]

T ^DA is preferably a group represented by the formula (TDA-1) ~ (TDA -3).

［式中、Ｒ^ＤＡおよびＲ^ＤＢは、前記と同じ意味を表す。］

[Wherein, R ^DA and R ^DB represent the same meaning as described above. ]

  The group represented by the formula (DA) is preferably a group represented by the formulas (DA1) to (DA3).

［式中、
ｎｐ１は、０〜５の整数を表し、ｎｐ２は０〜３の整数を表し、ｎｐ３は０または１を表す。複数存在するｎｐ１は、同一でも異なっていてもよい。
Ｒ^ｐ１、Ｒ^ｐ２およびＲ^ｐ３は、それぞれ独立に、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基またはハロゲン原子を表す。Ｒ^ｐ１およびＲ^ｐ２が複数存在する場合、それらはそれぞれ同一であっても異なっていてもよい。］

[Where,
np1 represents an integer of 0 to 5, np2 represents an integer of 0 to 3, and np3 represents 0 or 1. A plurality of np1 may be the same or different.
R ^p1 , R ^p2 and R ^p3 each independently represent an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group or a halogen atom. When a plurality of R ^p1 and R ^p2 are present, they may be the same or different. ]

  np1 is preferably 0 or 1, and more preferably 1. np2 is preferably 0 or 1, and more preferably 0. np3 is preferably 0.

R ^p1 , R ^p2 and R ^p3 are preferably an alkyl group or a cycloalkyl group.

Examples of the anionic bidentate ligand represented by -A ^D1 --- A ^D2- include a ligand represented by the following formula.

［式中、＊は、イリジウム原子と結合する部位を表す。］

[In the formula, * represents a site bonded to an iridium atom. ]

The iridium complex represented by the formula (Ir-1) is preferably an iridium complex represented by the formulas (Ir-11) to (Ir-13). The iridium complex represented by the formula (Ir-2) is preferably an iridium complex represented by the formula (Ir-21). The iridium complex represented by the formula (Ir-3) is preferably an iridium complex represented by the formulas (Ir-31) to (Ir-33). The iridium complex represented by the formula (Ir-4) is preferably an iridium complex represented by the formulas (Ir-41) to (Ir-43).
The iridium complex represented by the formula (Ir-5) is preferably an iridium complex represented by the formulas (Ir-51) to (Ir-53).

［式中、
ｎ^Ｄ２は、１または２を表す。
Ｄは、式（Ｄ−Ａ）で表される基を表す。複数存在するＤは、同一でも異なっていてもよい。
Ｒ^ＤＣは、水素原子、アルキル基、シクロアルキル基、アリール基または１価の複素環基を表し、これらの基は置換基を有していてもよい。複数存在するＲ^ＤＣは、同一でも異なっていてもよい。
Ｒ^ＤＤは、アルキル基、シクロアルキル基、アリール基または１価の複素環基を表し、これらの基は置換基を有していてもよい。複数存在するＲ^ＤＤは、同一でも異なっていてもよい。］

[Where,
n ^D2 represents 1 or 2.
D represents a group represented by the formula (DA). A plurality of Ds may be the same or different.
R ^DC 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. The plurality of R ^DCs may be the same or different.
R ^DD represents an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. A plurality of ^RDDs may be the same or different. ]

  Examples of the iridium complex include an iridium complex represented by the following formula.

  Iridium complexes are described in, for example, JP-T-2004-530254, JP-A-2008-179617, JP-A-2011-105701, JP-T-2007-504272, JP-A-2013-147449, and JP-A-2013-2013. It can be synthesized according to the method described in JP-A-147450.

  The solid content (A) may contain a polymer compound containing an iridium complex constituent unit. The iridium complex constituent unit has a structure of an iridium complex represented by the formula (Ir-1), (Ir-2), (Ir-3), (Ir-4) or (Ir-5). It is a structural unit. As a structural unit having a structure of the iridium complex represented by the formula (Ir-1), the formula (Ir-2), the formula (Ir-3), the formula (Ir-4) or the formula (Ir-5), it is preferable. Is a carbon constituting an iridium complex represented by the formula (Ir-1), the formula (Ir-2), the formula (Ir-3), the formula (Ir-4) or the formula (Ir-5). A structural unit having a group obtained by removing one or more and three or less hydrogen atoms directly bonded to an atom or a hetero atom, and more preferably a compound represented by the formula (Ir-1), the formula (Ir-2) or the formula (Ir) -3), a group obtained by removing two hydrogen atoms directly bonded to a carbon atom or a hetero atom constituting the complex from the iridium complex represented by the formula (Ir-4) or the formula (Ir-5). It is a structural unit having.

  As the polymer compound containing an iridium complex structural unit, at least one type of structural unit selected from the group consisting of the structural unit represented by the formula (X) and the structural unit represented by the formula (Y) is further used. Preferred is a polymer compound containing

Among these, as a polymer compound containing an iridium complex structural unit,
The structural unit represented by the formula (Y-4), the structural unit represented by the formula (Y-5), the structural unit represented by the formula (Y-6), and the configuration represented by the formula (Y-7) It is preferably a polymer compound containing at least one type of structural unit selected from the group consisting of units,
More preferably, it is a polymer compound containing at least one structural unit selected from the group consisting of a structural unit represented by the formula (Y-4) and a structural unit represented by the formula (Y-6),
More preferably, it is a polymer compound containing a structural unit represented by the formula (Y-4).

As the polymer compound containing an iridium complex structural unit, a structural unit represented by the formula (Y-4), a structural unit represented by the formula (Y-5), and a structural unit represented by the formula (Y-6) As a structural unit other than the structural unit and the structural unit represented by the formula (Y-7),
From the structural unit represented by the formula (Y-1), the structural unit represented by the formula (Y-2), the structural unit represented by the formula (Y-3), and the structural unit represented by the formula (X) It is preferably a polymer compound containing at least one structural unit selected from the group consisting of:
Including at least one structural unit selected from the group consisting of a structural unit represented by the formula (Y-1), a structural unit represented by the formula (Y-2), and a structural unit represented by the formula (X) More preferably, it is a polymer compound.

  The iridium complex constituent unit may be contained in the polymer compound in one kind alone or in two or more kinds.

<< First polymer compound >>
The first polymer compound having the largest weight average molecular weight among the main polymer compounds (a) has a weight average molecular weight of less than 1.4 × 10 ⁵ . The type of the first polymer compound is not limited as long as the weight average molecular weight is less than 1.4 × 10 ⁵ . The present inventors provide a film having excellent flatness when the first high molecular compound having a weight average molecular weight of less than 1.4 × 10 ⁵ and a main low molecular compound are contained as solids (A). A suitable range of the viscosity of the reference solution was found, and a suitable range of the viscosity of the reference solution was determined. Examples of the first polymer compound include a polymer compound containing at least one structural unit selected from the group consisting of a structural unit represented by the formula (X) and a structural unit represented by the formula (Y). Can be As the first polymer compound, a luminescent compound is exemplified. The light-emitting compound may be a compound that emits light by itself (light-emitting material), or a compound that causes the light-emitting material to emit light by transporting charges to the light-emitting material (host material). The first polymer compound is preferably a host material, and may be, for example, a host material of a green light emitting material or a host material of a red light emitting material. The first polymer compound may be a green light emitting material or a red light emitting material.

≪Host material≫
When the solid content (A) contains a light-emitting material, particularly when it contains an iridium complex as the light-emitting material, at least one function selected from the group consisting of a hole transport property, a hole injection property, an electron transport property, and an electron injection property. When used in combination with a host material having the above, the luminous efficiency of an organic EL device having a film formed using the composition of the present invention becomes more excellent. That is, when the composition of the present invention contains an iridium complex as the light-emitting material, it is preferable that the composition further contains a host material. When a host material is contained in the composition of the present invention, the host material may be contained alone or in combination of two or more.

  When the composition of the present invention contains an iridium complex and a host material, the content of the iridium complex is usually 0.05 to 80 when the total content of the iridium complex and the host material is 100 parts by mass. Parts by mass, preferably 0.1 to 60 parts by mass, more preferably 0.5 to 50 parts by mass.

  The lowest excited triplet state (T1) of the host material has the same energy level as T1 of the iridium complex, because the organic EL device having the film formed using the composition of the present invention has excellent luminous efficiency. Alternatively, a higher energy level is preferable.

  Host materials are classified into low molecular weight compounds (hereinafter also referred to as “low molecular weight hosts”) and high molecular weight compounds (hereinafter also referred to as “high molecular weight hosts”), and are either low molecular weight hosts or high molecular weight hosts. However, it is preferably a polymer host.

  Examples of the low-molecular-weight host include a compound having a carbazole structure, a compound having a triarylamine structure, a compound having a phenanthroline structure, a compound having a triaryltriazine structure, a compound having an azole structure, a compound having a benzothiophene structure, and benzofuran. A compound having a structure, a compound having a fluorene structure, a compound having a spirofluorene structure, and the like.

  Specific examples of the low molecular host include a compound represented by the following formula.

  As the polymer host, a polymer compound containing at least one kind of structural unit selected from the group consisting of the structural unit represented by the formula (X) and the structural unit represented by the formula (Y) is preferable.

Among them, as the polymer host,
The structural unit represented by the formula (Y-4), the structural unit represented by the formula (Y-5), the structural unit represented by the formula (Y-6), and the configuration represented by the formula (Y-7) It is preferably a polymer compound containing at least one type of structural unit selected from the group consisting of units,
More preferably, it is a polymer compound containing at least one structural unit selected from the group consisting of a structural unit represented by the formula (Y-4) and a structural unit represented by the formula (Y-6),
More preferably, it is a polymer compound containing a structural unit represented by the formula (Y-4).

Examples of the polymer host include a structural unit represented by the formula (Y-4), a structural unit represented by the formula (Y-5), a structural unit represented by the formula (Y-6), and a compound represented by the formula (Y). As a structural unit other than the structural unit represented by -7),
From the structural unit represented by the formula (Y-1), the structural unit represented by the formula (Y-2), the structural unit represented by the formula (Y-3), and the structural unit represented by the formula (X) It is preferably a polymer compound containing at least one structural unit selected from the group consisting of:
Including at least one structural unit selected from the group consisting of a structural unit represented by the formula (Y-1), a structural unit represented by the formula (Y-2), and a structural unit represented by the formula (X) More preferably, it is a polymer compound.

≪Low molecular compounds≫
The low molecular compound contained in the solid content (A) is not particularly limited, and the light emitting material such as the iridium complex, the host material, the hole transport material, the hole injection material, and the electron Examples thereof include a transport material, an electron injection material, and an antioxidant.

≪Other solid contents≫
The solid content (A) contained in the composition of the present invention may include the following hole transport material, hole injection material, electron transport material, electron injection material, and luminescent material.

(Hole transport material)
The hole transporting material is classified into a low molecular weight compound and a high molecular weight compound, preferably a high molecular weight compound, and more preferably a high molecular weight compound having a crosslinking group.

  Examples of the polymer compound include polyvinyl carbazole and derivatives thereof; polyarylene having an aromatic amine structure in a side chain or a main chain and derivatives thereof. The polymer compound may be a compound having an electron-accepting site bound thereto. Examples of the electron accepting site include fullerene, tetrafluorotetracyanoquinodimethane, tetracyanoethylene, trinitrofluorenone, and the like, and preferably fullerene.

  The composition of the present invention may contain one kind of hole transport material alone, or may contain two or more kinds thereof.

(Electron transport materials)
Electron transport materials are classified into low molecular weight compounds and high molecular weight compounds. The electron transporting material may have a crosslinking group.

  Examples of low-molecular compounds include, for example, metal complexes having 8-hydroxyquinoline as a ligand, oxadiazole, anthraquinodimethane, benzoquinone, naphthoquinone, anthraquinone, tetracyanoanthraquinodimethane, fluorenone, diphenyldicyanoethylene, and diphenoquinone And their derivatives.

  Examples of the polymer compound include polyphenylene, polyfluorene, and derivatives thereof. The polymer compound may be doped with a metal.

  The composition of the present invention may contain one kind of the electron transporting material alone, or may contain two or more kinds thereof.

(Hole injection material and electron injection material)
The hole injection material and the electron injection material are classified into a low molecular compound and a high molecular compound, respectively. The hole injection material and the electron injection material may have a crosslinking group.

  Examples of the low molecular compound 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 high molecular compound include polyaniline, polythiophene, polypyrrole, polyphenylenevinylene, polythienylenevinylene, polyquinoline and polyquinoxaline, and derivatives thereof; conductive polymers such as polymers containing an aromatic amine structure in the main chain or side chain. Functional polymers.
In the composition of the present invention, each of the hole injecting material and the electron injecting material may be contained alone or in combination of two or more.

When the hole injection material or the electron injection material contains a conductive polymer, the conductive polymer preferably has an electric conductivity of 1 × 10 ⁻⁵ S / cm to 1 × 10 ³ S / cm. In order to make the electric conductivity of the conductive polymer fall within such a range, the conductive polymer can be doped with an appropriate amount of ions.

  The type of ions to be doped is an anion for a hole injection material and a cation for an electron injection material. Examples of the anion include a polystyrene sulfonate ion, an alkylbenzene sulfonate ion, and a camphor sulfonate ion. Examples of the cation include a lithium ion, a sodium ion, a potassium ion, and a tetrabutylammonium ion.

  The ions to be doped may be used alone or in combination of two or more.

(Light-emitting material)
The solid content (A) may include a light-emitting material other than the above-described high molecular compound or low-molecular compound (hereinafter, also referred to as “other light-emitting materials”) as a light-emitting material. Other light-emitting materials include, for example, naphthalene and its derivatives, anthracene and its derivatives, and perylene and its derivatives.

  The composition of the present invention may contain one kind of other luminescent material alone, or may contain two or more kinds of luminescent materials.

(Antioxidant)
The composition of the present invention may contain an antioxidant that is soluble in the solvent (B) and does not inhibit luminescence and charge transport. Examples of the antioxidant include a phenolic antioxidant and a phosphorus-based antioxidant.

  The composition of the present invention may contain one kind of antioxidant alone or two or more kinds thereof.

<Composition ratio>
The composition of the present invention contains a solid (A) and a solvent (B). In the composition of the present invention, the content of the solid content (A) is usually 0.1 to 10.0 parts by mass when the content of the solvent (B) is 100 parts by mass, Is preferably 0.2 to 7.0 parts by mass, more preferably 0.3 to 5.0 parts by mass.

<Viscosity>
The viscosity of the composition of the present invention at a temperature of 23 ° C. is preferably 1 cP or more and 10 cP or less, more preferably 2 cP or more and 8 cP or less, from the viewpoint of applicability.

[Production method of composition for organic EL device]
The composition for an organic EL device of the present invention can be prepared, for example, by mixing a solid (A), a solvent (B) and other components. The mixing order of the components is not limited, and a part or all of the solid content (A) is mixed with a part of the solvent (B) in advance, and then the remaining components are adjusted to a predetermined concentration. The desired composition for an organic EL device may be prepared by mixing. For example, a reference solution is prepared by preliminarily mixing only the first solvent and the first polymer compound, and the viscosity of the reference solution is adjusted to a desired viscosity. A composition for an EL device may be prepared. The viscosity of the reference solution may be a value measured in the manufacturing process as described above, or a value determined from a value measured in advance based on the composition ratio of the first solvent and the first polymer. Is also good.

[film]
The film is a film formed using the composition of the present invention. The film may contain the solid content contained in the composition of the present invention as it is, or in a state where the solid content is crosslinked within or between molecules, or within and between molecules (crosslinked product). It may be contained. The film containing a crosslinked solid is a film obtained by crosslinking a film containing a solid by an external stimulus such as heating or light irradiation. Since the film containing the crosslinked product of the solid content is substantially insoluble in the solvent, it can be suitably used for laminating the organic EL device.

  The heating temperature for crosslinking the film is usually 25 to 300C, preferably 50 to 250C, and more preferably 150 to 200C.

  The type of light used for light irradiation for crosslinking the film is, for example, ultraviolet light, near ultraviolet light, visible light, or infrared light.

  The film is suitable as a light-emitting layer, a hole transport layer, or a hole injection layer in a light-emitting element. The thickness of the film is usually from 1 nm to 1 μm. Most preferably, the flatness of the film is 0%. When the film is concave, the flatness of the film is preferably at least -45%, more preferably at least -30%, further preferably at least -20%. When the film is convex, the flatness of the film is preferably 15% or less, more preferably 12% or less, and even more preferably 10% or less. The flatness of a film in this specification is a value calculated by a calculation method described later.

[Film production method]
The film can be produced by a method including a step of applying the composition of the present invention and a drying step of evaporating a solvent in the composition.

  The coating process includes, for example, a spin coating method, a casting method, a microgravure coating method, a gravure coating method, a bar coating method, a roll coating method, a wire bar coating method, a dip coating method, a spray coating method, a screen printing method, and a flexographic printing method. From the viewpoint that the coating method such as an offset printing method, an ink jet printing method, a capillary coating method, a nozzle coating method, etc. can be used, and the flatness of the film can be further improved, the ink jet printing which is an ejection type coating method is used. The method is preferably used.

The drying step is preferably performed under reduced pressure from the viewpoint of shortening the time of the drying step. The pressure adjustment in the drying step is usually performed by placing the object to be dried in the vacuum chamber and then gradually or stepwise reducing the pressure in the vacuum chamber from the atmospheric pressure. The ultimate pressure in the drying step is not particularly limited as long as the film is fixed, but is preferably 100 Pa or less, more preferably 10 Pa or less. The pressure reduction rate from the atmospheric pressure to 1000 Pa is, for example, 1000 Pa / sec to 30000 Pa / sec. The temperature in the vacuum chamber (more specifically, on the stage on which the object to be dried is placed) is controlled, for example, in a range of 20 ° C to 100 ° C, preferably in a range of 20 ° C to 50 ° C. From the viewpoint that the drying time can be shortened, the temperature in the vacuum chamber is preferably as high as possible. On the other hand, the drying target having low heat resistance is more preferably as the temperature in the vacuum chamber is close to room temperature.
* Yamashita's comment: We do not limit, but we would like to add the regulation of ultimate pressure.

When the temperature of the drying atmosphere in the drying step is 30 ° C. or more and 50 ° C. or less, the viscosity of the reference solution at a temperature of 23 ° C. is 2.20 × 10 cP or more and 1.77 × 10 2 from the viewpoint of obtaining excellent flattening. It is preferable to prepare the composition of the present invention so as to have ³ cP or less.

When the temperature of the drying atmosphere in the drying step is from 20 ° C. to less than 30 ° C., the viscosity of the reference solution at a temperature of 23 ° C. is from 1.30 × 10 cP to 8.70 × 10 from the viewpoint of obtaining excellent flattening. It is preferable to prepare the composition of the present invention so as to be ² cP or less.

  The present inventors manufactured a film under a plurality of drying conditions in which drying conditions (decompression rate, temperature in a vacuum chamber) were appropriately selected in a drying step, and excellent flatness was obtained by appropriately selecting the drying conditions. The preferred range of the viscosity at a temperature of 23 ° C. of the reference solution capable of producing a film having the following was determined, and the present invention was reached.

[Organic EL device]
The organic EL device of the present invention is an organic EL device having a film formed using the composition of the present invention. As described above, the film may contain the solid content contained in the composition of the present invention as it is, or may be in a state where the solid content is cross-linked intramolecularly or intermolecularly, or intramolecularly and intermolecularly (crosslinked). Body). The configuration of the organic EL device of the present invention includes, for example, an electrode composed of an anode and a cathode, and a film provided between the electrodes and formed using the composition of the present invention.

<Layer configuration>
The film obtained by using the composition of the present invention 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. is there. These layers each include a light emitting material, a hole transporting material, a hole injecting material, an electron transporting material, and an electron injecting material.

  The organic EL element has a light emitting layer between an anode and a cathode. The organic EL device of the present invention preferably has at least one layer of a hole injection layer and a hole transport layer between the anode and the light emitting layer, from the viewpoints of the hole injection property and the hole transport property, From the viewpoint of the electron injection property and the electron transport property, it is preferable to have at least one of an electron injection layer and an electron transport layer between the cathode and the light emitting layer.

  The material of the hole transport layer, the material of the electron transport layer, and the material of the light emitting layer are the solvents used when forming the layers adjacent to the hole transport layer, the electron transport layer, and the light emitting layer, respectively, in the production of the organic EL device. When dissolved in the solvent, the material preferably has a cross-linking group in order to avoid dissolving the material in the solvent. After forming each layer using a material having a crosslinking group, the layer can be substantially insolubilized in a solvent by crosslinking the crosslinking group.

  In the organic EL device of the present invention, as a method of forming each layer such as a light emitting layer, a hole transport layer, an electron transport layer, a hole injection layer, and an electron injection layer, when a low molecular compound is used, Examples thereof include a vapor deposition method, a method of forming a film from a solution or a molten state, and when a polymer compound is used, for example, a method of forming a film from a solution or a molten state.

  The order, number and thickness of the layers to be laminated are adjusted in consideration of luminous efficiency and luminance life.

<Substrate / electrode>
The substrate in the organic EL element may be a substrate on which an electrode can be formed and which does not chemically change when an organic layer is formed, for example, a substrate made of a material such as glass, plastic, or silicon. . In the case of an opaque substrate, it is preferred that the electrode furthest from the substrate is transparent or translucent.

Examples of the material of the anode include conductive metal oxides and translucent metals, and preferably, indium oxide, zinc oxide, and tin oxide; indium tin oxide (ITO), indium zinc oxide, and the like A complex of silver, palladium and copper (APC); NESA, gold, platinum, silver and copper.

Examples of the material of the cathode include metals such as lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, aluminum, zinc, and indium; alloys of two or more thereof; Alloys of at least one species with at least one of silver, copper, manganese, titanium, cobalt, nickel, tungsten, and tin; and graphite and graphite intercalation compounds. Examples of the alloy include a magnesium-silver alloy, a magnesium-indium alloy, a magnesium-aluminum alloy, an indium-silver alloy, a lithium-aluminum alloy, a lithium-magnesium alloy, a lithium-indium alloy, and a calcium-aluminum alloy.
Each of the anode and the cathode may have a laminated structure of two or more layers.

<Application>
In order to obtain planar light emission using an organic EL element, a planar anode and a planar cathode may be arranged so as to overlap. In order to obtain patterned light emission, a method of installing a mask provided with a patterned window on the surface of a planar light emitting element, forming a layer to be a non-light emitting portion extremely thick and substantially non-light emitting There is a method, a method of forming an anode or a cathode, or both electrodes in a pattern. By forming a pattern by any of these methods and arranging some electrodes so that they can be turned on / off independently, a segment type display device capable of displaying numbers, characters, and the like can be obtained. In order to form a dot matrix display device, both the anode and the cathode may be formed in a stripe shape and arranged orthogonally. A partial color display and a multi-color display can be achieved by a method in which a plurality of types of polymer compounds having different emission colors are separately applied and a method using a color filter or a fluorescence conversion filter. The dot matrix display device can be driven passively, and can also be driven actively in combination with a TFT or the like. These display devices can be used for displays of computers, televisions, mobile terminals, and the like. The planar light emitting element can be suitably used as a planar light source for a backlight of a liquid crystal display device or a planar illumination light source. If a flexible substrate is used, it can be used as a curved light source and a display device.

  Hereinafter, the present invention will be described in more detail with reference to test examples.

<Preparation of Compositions 1 to 4>
As a solid content, the ratio shown in Table 2 between Polymer 1 (weight average molecular weight: 1.25 × 10 ⁵ , first high molecular compound) and low molecular compound 1 (molecular weight: 1.68 × 10 ³ , main low molecular compound) And a solvent, decylbenzene (manufactured by Tokyo Chemical Industry Co., Ltd., boiling point at atmospheric pressure: 293 ° C., a first solvent, referred to as “D” in Table 2) and cyclohexylbenzene (manufactured by Tokyo Chemical Industry Co., Ltd., at atmospheric pressure) Boiling point: 238 ° C., referred to as “CHB” in Table 2) and 4-methylanisole (manufactured by Tokyo Chemical Industry Co., Ltd., boiling point at atmospheric pressure: 175 ° C., referred to as “MT” in Table 2). Using the ratios shown in Table 2, the solids were dissolved in a solvent such that the solids had the solids concentrations shown in Table 2, thereby preparing Compositions 1 to 4 as green light emitting material inks.

<Measurement of viscosity of reference solution in compositions 1 to 4>
Decylbenzene and Polymer 1 are mixed at the same ratio as in Compositions 1-4 to prepare a reference solution containing only decylbenzene and Polymer 1, and the viscosity of the reference solution at a temperature of 23 ° C. is automatically measured. The measurement was performed using a portable disposable viscometer (PDVa-100, manufactured by Stony Brook Scientific). Table 2 shows the measurement results.

<Measurement of weight average molecular weight of polymer used as solid content>
The weight average molecular weight (Mw) of the polymer in terms of polystyrene was measured by the GPC method under the following conditions.
Apparatus: HLC-8120GPC (manufactured by Tosoh Corporation)
Column: TSK-GELG2000HXL Column temperature: 40 ° C
Solvent; THF
Flow rate: 1.0 mL / min
Test liquid solid content concentration: 0.001 to 0.01% by mass
Injection volume: 50 μL
Detector; RI
Calibration standard material; TSK STANDARD POLYSTYRENE
F-40, F-4, F-288, A-2500, A-500
(Tosoh Corporation)

<Drying conditions>
As a drying condition when forming the light emitting layer using the compositions 1 to 4 as a green light emitting material ink, a drying target is placed on a stage in a vacuum drying apparatus, and the temperature on the stage is set at 25 ° C., 35 ° C., 55 ° C. Maintained at any temperature of 70 ° C., and the pressure in the vacuum drying apparatus was increased from atmospheric pressure (101325 Pa) to 1 Pa under reduced pressure conditions A, B1, B2, B3, and C shown in FIG. The pressure was reduced, and drying was performed while maintaining 1 Pa until the solvent was evaporated. Note that, under the decompression conditions A, B1, B2, B3, and C shown in FIG. 1, the time T (second) required to reach 1000 Pa from the atmospheric pressure, and the decompression speed V (Pa) required to reach 1000 Pa from the atmospheric pressure. / Sec) was as shown in Table 3.

[Test Examples 1 to 10: Production and evaluation of film shape measuring element]
(Preparation of transparent electrode substrate)
A transparent conductive film FLAT-ITO made by Geomatech Co., Ltd. was formed in a predetermined pattern on a glass substrate having a size of 370 mm × 470 mm × 0.5 mm (Eagle XG made by Corning) in a predetermined pattern.

(Production of substrate with liquid-repellent partition)
Implementation used, the integrated light quantity 400 mJ / cm ² down in hydrophilic treatment; - (PL3-200-15 company manufactured by Hitachi High-Technologies) to the transparent substrate with a conductive film produced in the above, _{UV-O 3} cleaning device Then, washing with pure water and drying with air were performed. 30 g of the prepared photosensitive resin composition was dropped onto the substrate, and the substrate was rotated at 900 rpm for 7 seconds by a spin coater to form a thin film of the photosensitive resin composition by coating. Thereafter, drying under reduced pressure was performed to 66 Pa using a vacuum drying apparatus (TR28340 CPD-CLT, manufactured by Tokyo Ohka Kogyo Co., Ltd.), and contact was made at 110 ° C. for 110 seconds on a hot plate to perform prebaking. Next, exposure was performed using an exposure apparatus (manufactured by Hitachi High-Technologies Corporation; LE4000A). The exposure amount was 200 mJ / cm ² , and the gap was 100 μm. For the photomask, a pattern in which a pattern (shape of the light-shielding portion is a rectangle of 200 μm in the major axis direction and 50 μm in the minor axis direction and whose four corners are cut into an arc shape (long circle)) is formed on the same plane. Using. Thereafter, using a developing solution prepared by diluting an aqueous solution of tetramethylammonium hydroxide (Tokuso SD25, manufactured by Tokuyama Corporation) with pure water to a concentration of 2.38%, using a shower developing machine (Sepha Technology Co., Ltd.), developed at 23 ° C. for 80 seconds, washed with water and air-dried, and post-baked in an oven (ESC: HSC-4) at 230 ° C. for 20 minutes to obtain a pattern. .

(Preparation of coating substrate)
The substrate obtained by patterning the liquid-repellent partition on the transparent electrode obtained above was converted from a size of 370 mm × 470 mm × 0.5 mm to 50 mm × using an LCD Glass cutting device (MS500, manufactured by Samsung Diamond Industrial Co., Ltd.). It was cut into a size of 50 mm × 0.5 mm.

(Formation of hole injection layer)
A hole injection material (ND-3202, manufactured by Nissan Chemical Industries, Ltd.) was introduced into an ink jet printing apparatus (142P, manufactured by Litex). Next, as pretreatment before coating, the substrate cut into a size of 50 mm square was baked at 230 ° C. for 15 minutes. Thereafter, a hole injecting material is applied by an inkjet printing method on an ITO film (ITO film thickness: 50 nm) formed on a glass substrate and surrounded by liquid-repellent partition walls, a stage temperature of 13 ° C., and a pressure reduction rate. Under a condition of 25790 Pa / sec, the solvent was dried under reduced pressure until the solvent was evaporated, and a hole injection layer having an average thickness of 65 nm was formed. The obtained film was heated at 230 ° C. for 15 minutes on a hot plate under an air atmosphere to form a hole injection layer.

(Formation of hole transport layer)
In a mixed solvent (decylbenzene / cyclohexylbenzene / 4-methylanisole = 18.4% by mass / 40.2% by mass / 41.4% by mass), the hole transporting material (polymer compound) was added at a solid concentration of 0%. A hole transport material composition in which 0.5% by mass was dissolved was prepared. The obtained hole transport material composition was introduced into an inkjet printing apparatus (142P, manufactured by Litex). Next, the hole transport material composition is applied on the hole injection layer by an inkjet printing method, and dried under reduced pressure at a stage temperature of 23 ° C. and a reduced pressure of 37000 Pa / sec until the solvent is evaporated. A film was formed with an average thickness of 20 nm. The obtained film was heated on a hot plate at 200 ° C. for 30 minutes in a nitrogen gas atmosphere to form a hole transport layer.

(Formation of light emitting layer)
One of the compositions 1 to 4 prepared above was used as a green light emitting material ink, and this was introduced into an ink jet printing apparatus (142P, manufactured by Litex). Next, a green light emitting material ink is applied on the hole transport layer by an inkjet printing method, and then dried under reduced pressure under the drying conditions (stage temperature and reduced pressure conditions) shown in Table 4 until the solvent evaporates. The film was formed with a thickness of 80 nm. The obtained film was heated on a hot plate at 180 ° C. for 10 minutes under a nitrogen gas atmosphere to form a light emitting layer.

(Formation of reflective film for measurement)
A glass substrate on which two layers of “hole injection layer / hole transport layer” or three layers of “hole injection layer / hole transport layer / light emitting layer” were formed was placed in a vapor deposition machine at 1.0 × 10 ^−4. After the pressure was reduced to Pa or less, aluminum was evaporated to a thickness of about 20 nm on the hole transporting layer or the light emitting layer to form a reflective film for measurement, thereby producing a film shape measuring element.

(Evaluation of film shape)
A substrate X1 having a layer configuration of “hole injection layer / hole transport layer / reflection film for measurement” and a substrate X2 having a layer configuration of “hole injection layer / hole transport layer / light emitting layer / reflection film for measurement” The film thicknesses of the two types of substrates were measured by a non-contact three-dimensional surface shape measuring device (manufactured by Zygo). The three-dimensional film thickness of the substrate X1 was D1, the three-dimensional film thickness of the substrate X2 was D2, and the thickness D3 of the single light emitting layer to be evaluated was obtained from the following equation.
D3 = D2-D1

Regarding the film thickness D3, in one pixel surrounded by the liquid-repellent partition, d is the thinnest film thickness, a is the area where the film thickness is d + 5 nm or less, b is the average film thickness, and the flatness y ( %) Was obtained from the following equation.
| Y | = (1− (a / pixel area) / (b / target film thickness)) × 100

  Further, with respect to the film thickness D3, the film thickness at two points at 10 μm from the edge of the liquid-repellent partition wall and the film thickness at the center of the pixel when a cross section is obtained at the center of the short axis so as to obtain a cross section on the pixel long axis side. When one of the two film thicknesses at a position 10 μm from the edge of the liquid-repellent partition was thicker than the pixel center, the film shape was regarded as concave, the value of y was negative, and the pixel center When the film thickness was larger, the film shape was regarded as convex, the value of the flatness y was set to a positive value, and the flatness y (%) was determined. Table 4 shows the flatness y (%) obtained based on the measurement results.

(Relationship between viscosity x of reference solution and flatness y)
2 to 11 are graphs plotting the viscosity x of the reference solution and the flatness y obtained based on the measurement results for Test Examples 1 to 10. 2 to 11, it was found that the relationship between the viscosity x of the reference solution and the flatness y had a relationship indicated by an approximate straight line. Table 4 shows the relational expressions indicated by the approximate straight lines in FIGS.

(Calculation of viscosity range to obtain desired flatness)
In each test example, based on the derivation relational expression described above, the viscosity of the reference solution in which the desired flatness of -45% to 15% was obtained was taken as a suitable range of the viscosity, and the lower and upper limits thereof were calculated. . Table 4 shows the results. The lower limit of the preferable range of the viscosity of the reference solution is the viscosity of the reference solution calculated when the flatness becomes -45%, and the upper limit of the preferable range of the viscosity of the reference solution is calculated when the flatness becomes 15%. Is the viscosity of the reference solution used.

(Discussion)
In Test Examples 1 to 10, the drying conditions (temperature, decompression rate) at the time of forming the light emitting layer were within the range that can be appropriately adopted by those skilled in the art. Therefore, the viscosity x of the reference solution has a viscosity x (4.40 × 10 cP or more and 5.01 × 10 ³ cP or less) at which a flatness of −45% to 15% is obtained in any of Test Examples 1 to 10. It can be seen that the composition can realize a flatness of −45% to 15% by appropriately adjusting the drying conditions by those skilled in the art.

Further, from Test Examples 2, 4, 6, 8, and 10, when the drying temperature is 35 ° C., the viscosity x of the reference solution at a temperature of 23 ° C. is 2.20 × 10 cP or more and 1.77 × 10 ³ cP or less. It can be seen that a composition having the composition can achieve high flatness. From Test Examples 1, 3, 5, 7, and 9, when the drying temperature is 25 ° C., the composition having a viscosity x at a temperature of 23 ° C. of the reference solution of not less than 1.30 × 10 cP and not more than 8.70 × 10 ² cP. It can be seen that a high degree of flatness can be realized with a material.

Claims (18)

A composition for an organic EL device comprising a solid and a solvent,
The solid content includes at least one main polymer compound contained in an amount of 5% by mass or more based on the total amount of the solids, and at least one main low molecular compound contained in an amount of 30% by mass or more based on the total amount of the solids. Including a species,
The solvent includes at least two main solvents contained in an amount of 5% by mass or more based on the total amount of the solvent,
The first solvent having the highest boiling point at atmospheric pressure among the main solvents, and the first polymer compound having the largest weight average molecular weight among the main polymer compounds are the first solvent and the first high solvent. The solution containing only the molecular compound is contained at a content ratio such that the viscosity at a temperature of 23 ° C. becomes 1.30 × 10 cP or more and 1.77 × 10 ³ cP or less,
The composition for an organic EL device, wherein the weight average molecular weight of the first polymer compound is less than 1.4 × 10 ⁵ .   The composition for an organic EL device according to claim 1, wherein the first solvent has a boiling point at atmospheric pressure of 250 ° C. or higher. The composition for an organic EL device according to claim 1, wherein the first solvent is a compound represented by the formula (1).

[In the formula (1), R ¹ represents an alkyl group having 10 to 12 carbon atoms. ]   The composition for an organic EL device according to any one of claims 1 to 3, wherein the concentration of the first solvent is 5% by mass or more and 60% by mass or less based on the total amount of the main solvent. The main solvent further includes a second solvent,
The composition for an organic EL device according to any one of claims 1 to 4, wherein the second solvent is an aromatic hydrocarbon excluding the compound represented by the formula (1).   The composition for an organic EL device according to claim 5, wherein the second solvent is selected from the group consisting of pentylbenzene, hexylbenzene, heptylbenzene, octylbenzene, nonylbenzene, cyclohexylbenzene, and tetralin. The main solvent further includes a third solvent,
The composition for an organic EL device according to any one of claims 1 to 6, wherein the third solvent is an aromatic ether.   The method according to claim 7, wherein the third solvent is selected from the group consisting of methylanisole, dimethylanisole, ethylanisole, butylphenylether, butylanisole, pentylanisole, hexylanisole, heptylanisole, octylanisole, and phenoxytoluene. The composition for an organic EL device. 9. The composition for an organic EL device according to claim 1, wherein each of the main polymer compounds has a weight average molecular weight of 3.0 × 10 ⁴ or more. 10.   The composition for an organic EL device according to claim 1, wherein the first polymer compound is a luminescent compound.   The composition for an organic EL device according to any one of claims 1 to 10, wherein the viscosity at a temperature of 23C is 1 cP or more and 10 cP or less.   A film formed from the composition for an organic EL device according to claim 1.   An organic EL device comprising the film according to claim 12. A preparation step of preparing the composition for an organic EL device according to any one of claims 1 to 11,
An application step of applying the composition for an organic EL element to form a coating film,
A drying step of drying the coating film.   The method for producing a film according to claim 14, wherein the drying step is a step of drying the coating film in a reduced-pressure atmosphere. In the preparing step, the first solvent and the first polymer compound have a viscosity at a temperature of 23 ° C. of the solution consisting of only the first solvent and the first polymer compound of 2.20 × 10 cP or more. A step of preparing a composition for an organic EL device, which is contained at a content ratio of not more than 1.77 × 10 ³ cP,
The method for producing a film according to claim 15, wherein the drying step is a step of drying the coating film in a reduced-pressure atmosphere having a temperature of 30C or higher and 50C or lower. In the preparing step, the first solvent and the first polymer compound have a viscosity at a temperature of 23 ° C. of the solution consisting of only the first solvent and the first polymer compound of 1.30 × 10 cP or more. A step of preparing a composition for an organic EL device, which is contained at a content ratio of 8.70 × 10 ² cP or less,
The method for producing a film according to claim 15, wherein the drying step is a step of drying the coating film in a reduced-pressure atmosphere having a temperature of 20 ° C or more and less than 30 ° C.   The production of a film according to any one of claims 15 to 17, wherein the drying step includes a step of reducing the atmosphere from atmospheric pressure to a pressure of 1,000 Pa at a pressure reduction rate of 1,000 Pa / sec or more and 30,000 Pa / sec or less. Method.

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