JP2020009757A - Production method of film, production method of organic el element, and ink composition set for film production - Google Patents

Abstract

To provide a film production method by which a plurality of kinds of films superior in flatness can be produced even in the case of using a plurality of kinds of ink compositions to produce films by a collective dry method.SOLUTION: A film production method comprises: an ink preparation step of preparing a first ink composition and a second ink composition which contain solid contents different from each other in species and which are 60% or more in the flatness R of test films; a first coating step of applying the first ink composition to a first region of a substrate to form a first coating layer; a second coating step of applying the second ink composition to a second region of the substrate, which is different from the first region, to form a second coating layer; and a drying step of putting the substrate in a drying oven to dry the first and second coating layers and form first and second films after the first and second coating steps. In the ink preparation step, the first ink composition and the second ink composition are prepared so that a first primary solvent and a second primary solvent become identical to each other in kind.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for producing a film and a method for producing an organic EL device, and also relates to an ink composition set for producing a 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.

  WO 2013/088844 (Patent Literature 1) describes that by adjusting the timing of applying a plurality of types of inks, it is possible to suppress variations in the cross-sectional shape between pixels.

International Publication No. 2013/088844

  The present inventors have found that, when a film is manufactured using a plurality of types of ink compositions, if the batch drying is performed, the flatness of the film differs depending on the type of the ink composition. However, when a film is manufactured using a plurality of types of ink compositions, if different drying conditions are employed depending on the type of the ink composition, the drying process becomes complicated.

  The present invention relates to a method of manufacturing a film capable of manufacturing a plurality of types of films having excellent flatness even when a film is manufactured by batch drying using a plurality of types of ink compositions, and an organic EL device. It is an object of the present invention to provide a method for producing a film and an ink composition set for producing a film.

  The present invention provides a method for producing a film, a method for producing an organic EL device, and an ink composition set for producing a film as described below.

［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主溶媒及び前記第２主溶媒は、式（１）で表される化合物を除く芳香族炭化水素を含む、〔１〕〜〔３〕のいずれか１項に記載の膜の製造方法。

［式（１）中、Ｒ^１は、炭素原子数が１０〜１２のアルキル基を表す。］
〔５〕 前記芳香族炭化水素は、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、〔４〕に記載の膜の製造方法。
〔６〕 前記第１主溶媒及び前記第２主溶媒は、芳香族エーテルを含む、〔１〕〜〔５〕のいずれか１項に記載の膜の製造方法。
〔７〕 前記芳香族エーテルは、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、〔６〕に記載の膜の製造方法。
〔８〕 前記第１インク組成物及び前記第２インク組成物は、互いに異なる高分子化合物を含む、〔１〕〜〔７〕のいずれか１項に記載の膜の製造方法。
〔９〕 前記高分子化合物が発光性化合物である、〔１〕〜〔８〕のいずれか１項に記載の膜の製造方法。
〔１０〕 〔１〕〜〔９〕のいずれか１項に記載の膜の製造方法により膜を製造する工程を含む、有機ＥＬ素子の製造方法。
〔１１〕 〔１〕〜〔１０〕のいずれか１項に記載の膜の製造方法に用いられるインク組成物セットであって、前記第１インク組成物と前記第２インク組成物とを少なくとも含む、インク組成物セット。 [1] A method for producing a film, comprising producing a first film and a second film on a surface of a substrate,
An ink preparation step of preparing a first ink composition and a second ink composition, wherein the first ink composition and the second ink composition each include solid species different from each other and have a flatness R of the test film of 60% or more;
A first application step of applying the first ink composition to a first region of the substrate to form a first application layer;
A second application step of applying the second ink composition to a second area different from the first area of the substrate to form a second application layer;
After the first coating step and the second coating step, the substrate is placed in a dryer, and the first coating layer and the second coating layer are dried to form a first film and a second film. Drying step,
In the ink preparing step, a first main solvent containing the first ink composition and the second ink composition in an amount of 5% by mass or more based on the total amount of the solvent of the first ink composition; A second main solvent contained in an amount of 5% by mass or more with respect to the total amount of the solvent of the ink composition is prepared so as to be identical in type,
The test film is formed by applying the ink composition to a test substrate to form a test coating layer, placing the test substrate in the dryer, and drying the test coating layer under the drying conditions in the drying step. The resulting membrane,
The flatness R (%) is defined as the area of a region where the film thickness is T _min +10 nm or less when the area of the entire region is A (μm ² ) and the minimum film thickness is T _min (nm) in the test film. Is B (μm ² ), the following equation:
R = (B / A) × 100
The method for producing a film, calculated by:
[2] In the ink preparing step, the first ink composition and the second ink composition are the same in the type of the first main solvent and the second main solvent and contain the respective components. The method for producing a film according to [1], wherein the film is prepared so as to have different ratios.
[3] The method for producing a film according to [1] or [2], wherein the first main solvent and the second main solvent include 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 film according to any one of [1] to [3], wherein the first main solvent and the second main solvent include an aromatic hydrocarbon excluding a compound represented by the formula (1). Manufacturing method.

[In the formula (1), R ¹ represents an alkyl group having 10 to 12 carbon atoms. ]
[5] The method according to [4], wherein the aromatic hydrocarbon is selected from the group consisting of pentylbenzene, hexylbenzene, heptylbenzene, octylbenzene, nonylbenzene, cyclohexylbenzene, and tetralin.
[6] The method for producing a film according to any one of [1] to [5], wherein the first main solvent and the second main solvent include an aromatic ether.
[7] The aromatic ether is selected from the group consisting of methylanisole, dimethylanisole, ethylanisole, butylphenylether, butylanisole, pentylanisole, hexylanisole, heptylanisole, octylanisole, and phenoxytoluene. ] The method for producing a film according to [1].
[8] The method for producing a film according to any one of [1] to [7], wherein the first ink composition and the second ink composition include polymer compounds different from each other.
[9] The method for producing a film according to any one of [1] to [8], wherein the polymer compound is a luminescent compound.
[10] A method for producing an organic EL device, comprising a step of producing a film by the method for producing a film according to any one of [1] to [9].
[11] An ink composition set used in the method for producing a film according to any one of [1] to [10], including at least the first ink composition and the second ink composition. , Ink composition set.

  According to the method for producing a film of the present invention, even when a plurality of types of films are formed using a plurality of types of ink compositions, a plurality of types of films having excellent flatness can be obtained without complicated drying steps. Can be manufactured.

It is a figure which shows typically the application process of the manufacturing method which concerns on this invention. FIG. 3 is a top view illustrating an example of a substrate after a coating step in a manufacturing method according to the present invention. FIG. 3A is a diagram illustrating a cross-sectional shape of a first film of Example 1, and FIG. 3B is a diagram illustrating a cross-sectional shape of a test film. FIG. 3A is a diagram illustrating a cross-sectional shape of a second film of Example 1 and FIG. 3B is a cross-sectional shape of a test film. It is a figure which shows (a) the cross-sectional shape of the 1st film of Example 2, and (b) the cross-sectional shape of a test film. It is a figure which shows (a) the cross-sectional shape of the 2nd film of Example 2, and (b) the cross-sectional shape of a test film. FIG. 3A is a diagram illustrating a cross-sectional shape of a first film of Comparative Example 1, and FIG. FIG. 3A is a diagram illustrating a cross-sectional shape of a second film of Comparative Example 1, and FIG. 3B is a diagram illustrating a cross-sectional shape of a test film.

[Film production method]
The present invention is a film manufacturing method for manufacturing a first film and a second film on a surface of a substrate,
An ink preparation step of preparing a first ink composition and a second ink composition, wherein the first ink composition and the second ink composition each include solid species different from each other and have a flatness R of the test film of 60% or more;
A first application step of applying the first ink composition to a first region of the substrate to form a first application layer;
A second application step of applying the second ink composition to a second area different from the first area of the substrate to form a second application layer;
After the first coating step and the second coating step, the substrate is placed in a dryer, and the first coating layer and the second coating layer are dried to form a first film and a second film. Drying step.

  The method for producing a film according to the present invention relates to a method for producing a film having at least two types of films (a first film and a second film) on the surface of a substrate. It also includes a method for producing a film having the same.

  In the ink preparing step, a first main solvent containing the first ink composition and the second ink composition in an amount of 5% by mass or more based on the total amount of the solvent of the first ink composition; The second main solvent contained in the ink composition in an amount of 5% by mass or more based on the total amount of the solvent is prepared so as to be identical in type.

〔substrate〕
The substrate has a first region and a second region different from the first region. When the film manufactured by the manufacturing method according to the present invention is used as an element of an organic EL device, the first region corresponds to the first pixel of the organic EL device, and the second region corresponds to the second pixel of the organic EL device. Corresponding to In this case, as one mode, on the substrate, the first region and the second region are defined by partition walls, and the planar shape of each region is a circle, an ellipse, an ellipse, a rectangle, or the like. The substrate may be a substrate that does not chemically change when the organic layer is formed, and is, for example, a substrate made of a material such as glass, plastic, or silicon.

[First coating step and second coating step]
An example of a first coating step and a second coating step performed using an inkjet printing apparatus will be described with reference to the drawings. FIG. 1 shows an example of the first application step. In FIG. 1, a first coating layer is formed using a first ink composition in a first region 41 using a substrate 1 having a first region 41 and a second region 42 that are alternately arranged. An application step is performed. The ink jet printing apparatus used in the first application step and the second application step has a first head for discharging the first ink composition and a second head for discharging the second ink composition. The first coating process is performed using a first inkjet printing apparatus having a first head that discharges a first ink composition, and the first coating step is performed using a second inkjet printing apparatus that has a second head that discharges a second ink composition. Two coating steps may be performed.

  As shown in FIG. 1, in the first coating step, the substrate 1 is transported under the first head 21, and the first ink composition is supplied from a plurality of ejection nozzles at positions corresponding to the first area 41 of the first head 21. A droplet of the object is ejected, and the droplet is dropped on the first region 41 to form a first coating layer. In the apparatus shown in FIG. 1, while the substrate 1 is transported in a direction Dd orthogonal to the arrangement direction of the first heads 21, the first ink composition is applied to the first row (the direction parallel to the arrangement direction of the first heads 21). The first application layer is formed by dropping the required number of droplets on the first region 41, and the next first coating layer is subsequently formed by dropping the required number of droplets on the first region 41 in the next row. By performing such operations continuously, a first coating step of forming a first coating layer in the first region 41 is performed. If the number of pixels that need to be applied in one row on the substrate 1 is larger than the number of ejection nozzles of the first head, the first head 21 is moved in the arrangement direction, or the substrate 1 is moved to the second position. The coating is performed on all the pixels that need to be coated by a method such as moving the head 21 in the arrangement direction. The transport of the substrate 1 in the direction Dd orthogonal to the arrangement direction of the first heads 21 may involve reciprocating the transport along with the transport in the direction opposite to the direction Dd. At this time, the ejection from the first head 21 may be performed in both forward and backward directions of the reciprocating movement, or may be performed only in forward and backward directions.

  After the first application step, a second application step is performed. Also in the second application step, similarly to the first application step, droplets of the second ink composition are ejected from a plurality of ejection nozzles at positions corresponding to the second region 42 of the second head, and this is the second ink composition. The second coating layer is formed by being dropped on the region 42.

  FIG. 2 schematically shows the upper surface of the substrate 1 after the first application step and the second application step are completed. As shown in FIG. 2, a first coating layer is formed in a first region 41, and a second coating layer is formed in a second region. In this embodiment, only the case where two types of ink compositions are used has been described. However, even when three or more types of ink compositions are used, three or more types of coating layers can be formed by repeating the same coating process. Can be formed.

  As an apparatus for applying the ink used in the first application step and the second application step, an ink jet printing apparatus shown in FIG. 1 and the like can be mentioned. The first coating step and the second coating step are not limited to the ink jet printing method using the ink jet printing apparatus, and a nozzle printing method, a flexographic printing method, an offset printing method, or the like can be used.

(Drying process)
In the drying step, the substrate on which the first coating layer and the second coating layer are formed is placed in a dryer and placed under a predetermined atmosphere, whereby the first coating layer is dried to form a first film. The second coating layer is dried to form a second film.

  In the drying step, the solvent evaporates and cures from the first ink composition forming the first coating layer and the second ink composition forming the second coating layer to form the first film and the second film.

  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 performed by lowering the pressure in the dryer gradually or stepwise from the atmospheric pressure after placing the substrate in the dryer. The pressure reduction rate from the atmospheric pressure to 1000 Pa is preferably, for example, from 1,000 Pa / sec to 30,000 Pa / sec. It is preferable to control the temperature inside the dryer (more specifically, on the stage on which the substrate 1 is mounted) to be maintained, for example, in the range of 20 ° C. or more and 100 ° C. or less.

[Ink preparation process]
In the ink preparation step, a first ink composition and a second ink composition are prepared. The first ink composition and the second ink composition contain solid species different from each other, and the flatness R of the test film is 60% or more.

  The test film is obtained by applying the ink composition to a test substrate to form a test coating layer, placing the test substrate in the same dryer as the drying process, and drying the test coating layer under the drying conditions in the drying process. Film.

The flatness R (%) is defined as the area of a region where the film thickness is T _min +10 nm or less when the area of the entire region is A (μm ² ) and the minimum film thickness is T _min (nm). (Μm ² ), the following equation:
R = (B / A) × 100
It is assumed to be calculated by The flatness R (%) of the first film and the second film is calculated in the same manner as the flatness R (%) of the test film.

  The present inventors have conducted batch drying using a plurality of types of ink compositions in the drying step, even when preparing an ink composition in which the flatness R of the test film is 60% or more in the ink preparation step. In this case, the inventors have found that the flatness R may be reduced to less than 60% depending on the film, and have conducted intensive studies to solve such a problem, leading to the present invention. .

  In the ink preparation step, the present inventors provide a first main solvent containing the first ink composition and the second ink composition in an amount of 5% by mass or more based on the total amount of the solvent of the first ink composition; By preparing the second main solvent, which is contained in an amount of 5% by mass or more with respect to the total amount of the solvent of the ink composition 2, so as to be the same in type, even when the batch drying is performed in the drying step, the first The inventors have found that both the film and the second film have excellent flatness R, and have reached the present invention. According to the present invention, even when batch drying is performed in the drying step, it is possible to manufacture the first film and the second film so that the flatness R of both the films is 60% or more.

  In the ink preparation step, the first ink composition and the second ink composition are mixed so that the first main solvent and the second main solvent are the same in type and different in the content ratio of each component. It is preferable to prepare. The case where the first main solvent and the second main solvent are the same in kind corresponds to, for example, a case where each of the first main solvent and the second main solvent only includes the solvent a, the solvent b, and the solvent c. The difference between the first main solvent and the second main solvent in the content ratio of each component means that, for example, the ratio “content of solvent a: content of solvent b: content of solvent c” is the first main solvent And the second main solvent is different.

  The first ink composition and the second ink composition include “solid content (A)” and “solvent (B)”. Terms commonly used in this specification have the following meanings unless otherwise specified.

The “polymer compound” has a molecular weight distribution and a polystyrene equivalent weight average molecular weight of 1 ×.
It means a polymer having a density of 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.

  “Main solvent” means a solvent contained in an amount of 5% by mass or more based on the total amount of the solvent (B). The “main solvent” is a general term including the “first main solvent” that is the main solvent in the first ink composition and the “second main solvent” that is the main solvent in the second ink composition.

  “Ink composition” is a generic term that includes “first ink composition” and “second ink composition”.

<Solvent (B)>
The solvent (B) contained in each ink composition preferably contains at least two main solvents. Examples of the main solvent 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 a solvent that is an aromatic ether ( b3) is 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) includes only two different compounds belonging to the solvent (b1) as the main solvent, at least two main solvents are included. The solvent (b1), the solvent (b2), and the solvent (b3) may be contained as a main solvent in the solvent (B), and may be contained as a solvent other than the main solvent, that is, as a solvent contained in less than 5% by mass. It may be. The solvent (B) contained in each ink composition may contain only one main solvent.

［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,
Branched alkyl groups such as tetramethylheptyl group, tetramethyloctyl group, pentamethylhexyl group, pentamethylheptyl group, and hexamethylhexyl group; and decyl, undecyl, dodecyl, tetramethyloctyl, and pentamethyl A heptyl group or a hexamethylhexyl group is preferred, a decyl group, an undecyl group or a dodecyl group is more preferred, and 1-decyl group, 2-decyl group, 3-decyl group, 4-decyl group, 5-decyl group, 1-undecyl A group, 2-undecyl group, 3-undecyl group, 1-dodecyl group, 2-dodecyl group or 3-dodecyl group is more preferable, and 1-decyl group, 2-decyl group or 3-decyl group is particularly preferable.

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

  Each ink composition may contain one kind of the solvent (b1) alone or 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.

  Each ink composition 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 ink composition may contain one kind of the solvent (b3) alone, or may contain two or more kinds of the solvent (b3).

≪Other solvents≫
Each ink composition 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 a main solvent contained in an amount of 5% by mass or more based on the total amount of the solvent (B), or may be other than the main solvent contained in the solvent (B) in an amount less than 5% by mass. May be contained as a 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.

  Each ink composition may contain one kind of the solvent (b4) alone, or may contain two or more kinds of the solvent (b4).

≪Highest boiling point solvent≫
In each ink composition, the highest boiling point solvent having the highest boiling point among the main solvents preferably has a boiling point at atmospheric pressure of 200 ° C. or higher. The highest boiling point solvent preferably has a boiling point at atmospheric pressure of 350 ° C. or lower. The highest boiling point solvent is preferably the above-mentioned solvent (b1). The boiling point of the highest boiling point solvent at atmospheric pressure is preferably at least 10 ° C., more preferably at least 20 ° C., different from the boiling point at atmospheric pressure of the solvent having the second highest boiling point at atmospheric pressure in the main solvent. Is more preferable, and the temperature is more preferably 30 ° C. or higher. The concentration of the highest boiling point solvent is preferably 5% by mass to 60% by mass, more preferably 10% by mass to 50% by mass, based on the total amount of the main solvent.

組成 Solvent composition ratio≫
In one example of the solvent (B), the main solvent includes the solvent (b1), the solvent (b2), and the solvent (b3), and the content of the solvent (b1): m1 (mass) and the content of the solvent (b2) With respect to the amount: m2 (mass) and the content of the solvent (b3): m3 (mass), the flatness of the test film formed using the ink composition can be increased. ) And (2) are preferably satisfied.
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 highest boiling point 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 highest boiling point 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 each ink composition preferably contains a high molecular compound, and may contain a low molecular compound. When the solid content (A) contains a low molecular compound, the low molecular compound 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 obtained 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≫
Each ink composition preferably contains a polymer compound different from each other as the solid content (A). In each ink composition, the polymer compound contained in the solid content (A) is, for example, a luminescent compound. 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 polymer compound is preferably a light emitting material. When the compound is a light-emitting compound, from the viewpoint of having excellent light-emitting properties, 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) It is preferably a polymer compound containing

  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. The other structural units mean structural units represented by the formula (Y) and structural units 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.

≪Host material≫
In each of the ink compositions, when the solid content (A) contains a light emitting material, particularly when the solid content (A) contains an iridium complex as the light emitting material, the solid content (A) is selected from the group consisting of hole transporting properties, hole injecting properties, electron transporting properties, and electron injecting properties. When used in combination with a host material having at least one selected function, 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 each ink composition contains an iridium complex and a host material, the content of the iridium complex is usually 0.05 to 80 mass when the total content of the iridium complex and the host material is 100 parts by mass. Part, 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≫
In each ink composition, the low molecular compound contained in the solid content (A) is not particularly limited, and the light emitting material such as the above iridium complex, the above host material, the following hole transport material, Examples include a hole injection material, an electron transport material, an electron injection material, an antioxidant, and the like.

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

(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 can be mentioned, and preferred is 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 ink composition 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.
Each of the ink compositions may contain one type of hole injection material and one type of electron injection material, or may contain two or more types.

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.

(Luminescent compound)
In each ink composition, the solid content (A) includes a light-emitting compound other than the above-described polymer compound or low-molecular compound (hereinafter, also referred to as “other light-emitting compounds”) exemplified as the light-emitting compound. You may go out. Other luminescent compounds include, for example, naphthalene and its derivatives, anthracene and its derivatives, and perylene and its derivatives.

  In each ink composition, one or more other luminescent compounds may be contained.

(Antioxidant)
Each ink composition may contain an antioxidant which is soluble in the solvent (B) and does not inhibit light emission and charge transport. Examples of the antioxidant include a phenolic antioxidant and a phosphorus-based antioxidant.

  Each ink composition may contain one kind of antioxidant alone or two or more kinds thereof.

<Composition ratio>
Each ink composition contains a solid (A) and a solvent (B). In each of the ink compositions, 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, It is preferably 0.2 to 7.0 parts by mass, more preferably 0.3 to 5.0 parts by mass, because of excellent dischargeability.

<Viscosity>
From the viewpoint of applicability, the viscosity of each ink composition 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.

[Method for producing ink composition]
Each ink composition 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 ink composition may be prepared by mixing.

[film]
The first film and the second film are films formed using the first ink composition and the second ink composition, respectively. Each film may contain the solid content contained in each ink composition as it is, or in a state where the solid content is crosslinked in a molecule or between molecules, or in a molecule and between molecules (crosslinked body). It may be contained. The film containing the crosslinked product of the solid content is a film obtained by crosslinking the coating layer containing the solid content 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 lamination.

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

  The types of light used for light irradiation for cross-linking solids are, for example, ultraviolet light, near ultraviolet light, visible light, and infrared light.

Each 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 each film is usually 1 nm to 1 μm. The flatness R of the film is preferably 60% or more, more preferably 70% or more, and even more preferably 90% or more.
The flatness R of the film in this specification is a value calculated by a calculation method described later.

<Application>
The film obtained by the production method according to the present invention is useful as an element of an organic EL element, an element of a color filter, and the like. The organic EL element includes a plurality of types of pixels provided on a substrate, and usually has a pair of electrodes including an anode and a cathode corresponding to each pixel. The plurality of types of pixels include at least a first pixel and a second pixel. The first pixel has a first film formed using the first ink composition. The second pixel has a second film formed using the second ink composition. The plurality of types of pixels are not limited to two types, and may be, for example, three types of pixels of R, G, and B. The organic EL element can be used for displays of computers, televisions, mobile terminals, and the like. The organic EL element can be 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.

[Method of Manufacturing Organic EL Element]
The method of manufacturing an organic EL device according to the present invention includes a step of manufacturing a film by the above-described method of manufacturing a film.

<Organic EL device>
≪Layer structure≫
The first film formed using the first ink composition and the second film formed using the second ink composition generally include a light emitting layer, a hole transport layer, a hole injection layer, and an electron transport layer. Layer or one or more layers of an electron injection layer, and preferably a light emitting layer. These layers each include a luminescent compound, 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 element 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 hole injection properties and hole transport properties. From the viewpoint of electron transportability, 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, 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, for example, a vacuum evaporation method from powder, A method of forming a film from a solution or a molten state is exemplified. When a polymer compound is used, for example, a method of forming a film from a solution or a molten state is exemplified. The method for manufacturing an organic EL device according to the present invention includes at least a first coating step of forming a first coating layer, a second coating step of forming a second coating layer, and a first coating layer and a second coating layer. A drying step of forming a first film and a second film by drying.

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

≪electrode≫
Examples of the material of the anode include a conductive metal oxide and a translucent metal, and preferably, indium oxide, zinc oxide, and tin oxide; indium tin oxide (ITO), indium zinc oxide, and the like Conductive compound; complex of silver, palladium and copper (APC); N
ESA, gold, platinum, silver and copper.

  Examples of the cathode material include metals such as lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, aluminum, zinc, and indium; alloys of two or more 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.

[Ink composition set]
The ink composition set according to the present invention is an ink composition set for producing a film including at least the first ink composition and the second ink composition described above. By manufacturing a film containing a plurality of types of films using the ink composition set according to the present invention, even when forming a plurality of types of films, excellent flatness is achieved without a complicated drying step. Can be produced. The ink composition set according to the present invention is also useful for manufacturing an organic EL device.

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

<Ink composition 1, 2, 4>
Polymer 1 (weight average molecular weight: 1.25 × 10 ⁵ ) and low molecular weight compound 1 (molecular weight: 1.68 × 10 ³ ) were used as solids in the ratio shown in Table 2, and decylbenzene (Tokyo Kasei) was used as a solvent. Manufactured by Tokyo Chemical Industry Co., Ltd .; boiling point at atmospheric pressure: 293 ° C .; referred to as “D” in Table 2); and cyclohexylbenzene (manufactured by Tokyo Chemical Industry Co., Ltd .; boiling point at atmospheric pressure: 238 ° C .; referred to in Table 2 as “CHB”). ) And 4-methylanisole (manufactured by Tokyo Chemical Industry Co., Ltd., boiling point at atmospheric pressure: 175 ° C., referred to as “MT” in Table 2) at a ratio shown in Table 2, and a solid content shown in Table 2 By dissolving in a solvent so as to obtain a partial concentration, ink compositions 1, 2, and 4 as green light-emitting inks were prepared.

<Ink composition 3>
Polymer 3 (weight average molecular weight: 1.7 × 10 ⁵ ) and polymer 4 (weight average molecular weight: 7.0 × 10 ⁴ ) were used as solids in the ratio shown in Table 2, and decylbenzene (Tokyo, Japan) was used as a solvent. Boiling point at atmospheric pressure: 293 ° C., manufactured by Kaseisha Co., Ltd .; referred to as “D” in Table 2.) and cyclohexylbenzene (boiling point at atmospheric pressure: 238 ° C., manufactured by Tokyo Kasei Co., Ltd .; 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) at a ratio shown in Table 2, and solid contents are shown in Table 2. The ink was dissolved in a solvent so as to have a solid content concentration to prepare an ink composition 3 as a blue light-emitting ink.

<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.

<Preparation 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 test film>
Using one of the ink compositions prepared as described above (ink compositions 1, 2, and 4), this was introduced into an inkjet printing apparatus (142P, manufactured by Litex). Next, the ink composition is applied on the hole transport layer by an ink jet printing method, and is put into a dryer. The temperature inside the dryer is 25 ° C. The pressure was reduced at a rate of / sec, and the film was dried under reduced pressure until the solvent was evaporated, thereby forming a film having a target thickness of 80 nm. The resulting film was heated on a hot plate at 180 ° C. for 10 minutes under a nitrogen gas atmosphere to form a light emitting layer (test film). In the same manner, a film having a target film thickness of 60 nm was formed using the ink composition 3 to form a light emitting layer (test film).

(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 thickness of the substrate X1 was D1, the three-dimensional thickness of the substrate X2 was D2, and the thickness T of a single light-emitting layer (test film) to be evaluated was obtained from the following equation.
T = D2-D1

Regarding the film thickness T (nm), when the area of the entire region of one pixel surrounded by the liquid-repellent partition is A (μm ² ) and the minimum film thickness in the pixel is T _min (nm), Assuming that the area of the region of T _min +10 nm or less is B (μm ² ), the flatness R (%) is a value obtained from the following equation.
R = (B / A) × 100

  Table 2 shows the flatness R of the test films obtained with the ink compositions 1 to 4.

<Examples 1 and 2 and Comparative Example 1>
In Examples 1 and 2 and Comparative Example 1, two kinds of luminescence were obtained through a drying step (collective drying) using two kinds of the ink compositions (ink compositions 1 to 4) prepared above as shown in Table 3. A light emitting layer was formed in the same manner as the above-described test film except that the layers (the first film and the second film) were formed, and the film shape was evaluated by the same method as the above-described test film. The drying conditions in the drying step when forming the light emitting layer were the same as the drying conditions employed when forming the test film. Table 3 shows the flatness (flatness after batch drying) of one pixel for each of the first film and the second film obtained in Examples 1 and 2 and Comparative Example 1, and the same ink composition as described above. And the flatness (flatness after drying alone) of the test film obtained in (1).

FIG. 3 shows a cross-sectional shape in the major axis direction passing through a position 25 μm from a pixel end which is the center of the pixel short axis 50 μm of the first film obtained by the ink composition 1 in Example 1 (FIG. 3A) ) And the cross-sectional shape in the major axis direction passing through a position 25 μm from the pixel end which is the center of the minor axis 50 μm of the pixel of the test film obtained by the ink composition 1 (FIG. 3B). Show.

  FIG. 4 shows a cross-sectional shape in the major axis direction passing through a position 25 μm from a pixel end which is the center of the pixel short axis 50 μm of the second film obtained by the ink composition 2 in Example 1 (FIG. 4A) ) And the cross-sectional shape in the major axis direction passing through a position 25 μm from the pixel end which is the center of the minor axis 50 μm of the pixel of the test film obtained by the ink composition 2 (FIG. 4B). Show.

  FIG. 5 shows a cross-sectional shape in the major axis direction passing through a position 25 μm from a pixel end which is the center of the pixel short axis 50 μm of the first film obtained by the ink composition 1 in Example 3 (FIG. 5A) ) And the cross-sectional shape in the major axis direction passing through a position 25 μm from the pixel end, which is the center of the minor axis 50 μm of the pixel of the test film obtained by the ink composition 1 (FIG. 5B). Show.

  FIG. 6 shows a cross-sectional shape in the major axis direction passing through a position 25 μm from the pixel end which is the center of the pixel short axis 50 μm of the second film obtained by the ink composition 3 in Example 3 (FIG. 6A) ) And the cross-sectional shape in the major axis direction passing through a position 25 μm from the pixel end which is the center of the minor axis 50 μm of the pixel of the test film obtained by the ink composition 3 (FIG. 6B). Show.

  FIG. 7 shows a cross-sectional shape in the major axis direction passing through a position 25 μm from the pixel end which is the center of the pixel short axis 50 μm of the first film obtained by the ink composition 4 in Comparative Example 1 (FIG. 7A) ) And the cross-sectional shape in the major axis direction passing through the position 25 μm from the pixel end which is the center of the minor axis 50 μm of the pixel of the test film obtained by the ink composition 4 (FIG. 7B). Show.

  FIG. 8 shows a cross-sectional shape in the major axis direction passing through a position 25 μm from the pixel end which is the center of the pixel short axis 50 μm of the second film obtained by the ink composition 1 in Comparative Example 1 (FIG. 8A) ) And the cross-sectional shape in the major axis direction passing through a position 25 μm from the pixel end which is the center of the minor axis 50 μm of the pixel of the test film obtained by the ink composition 1 (FIG. 8B). Show.

  As can be seen from the results shown in Table 3 and FIGS. 3 to 8, in Examples 1 and 2 in which the type of solvent was the same in the two ink compositions, the first film and the second film were obtained by batch drying. In both cases, excellent flatness was obtained. On the other hand, in Comparative Example 1 in which the type of solvent was different, the batch drying resulted in low flatness of the first film.

  1 Substrate, 21 1st head, 41 1st area, 42 2nd area, 43 partition.

Claims (11)

A film manufacturing method for manufacturing a first film and a second film on a surface of a substrate,
An ink preparation step of preparing a first ink composition and a second ink composition, wherein the first ink composition and the second ink composition each include solid species different from each other and have a flatness R of the test film of 60% or more;
A first application step of applying the first ink composition to a first region of the substrate to form a first application layer;
A second application step of applying the second ink composition to a second area different from the first area of the substrate to form a second application layer;
After the first coating step and the second coating step, the substrate is placed in a dryer, and the first coating layer and the second coating layer are dried to form a first film and a second film. Drying step,
In the ink preparing step, a first main solvent containing the first ink composition and the second ink composition in an amount of 5% by mass or more based on the total amount of the solvent of the first ink composition; A second main solvent contained in an amount of 5% by mass or more with respect to the total amount of the solvent of the ink composition is prepared so as to be identical in type,
The test film is formed by applying the ink composition to a test substrate to form a test coating layer, placing the test substrate in the dryer, and drying the test coating layer under the drying conditions in the drying step. The resulting membrane,
The flatness R (%) is defined as the area of a region where the film thickness is T _min +10 nm or less when the area of the entire region is A (μm ² ) and the minimum film thickness is T _min (nm) in the test film. Is B (μm ² ), the following equation:
R = (B / A) × 100
The method for producing a film, calculated by:   In the ink preparing step, the first ink composition and the second ink composition are the same in the type of the first main solvent and the type of the second main solvent, and different in the content ratio of each component. The method for producing a film according to claim 1, wherein the film is prepared as follows. 3. The method according to claim 1, wherein the first main solvent and the second main solvent include a compound represented by the formula (1). 4.

[In the formula (1), R ¹ represents an alkyl group having 10 to 12 carbon atoms. ] The method for producing a film according to any one of claims 1 to 3, wherein the first main solvent and the second main solvent include an aromatic hydrocarbon excluding a compound represented by the formula (1).

[In the formula (1), R ¹ represents an alkyl group having 10 to 12 carbon atoms. ]   The method according to claim 4, wherein the aromatic hydrocarbon is selected from the group consisting of pentylbenzene, hexylbenzene, heptylbenzene, octylbenzene, nonylbenzene, cyclohexylbenzene, and tetralin.   The method according to any one of claims 1 to 5, wherein the first main solvent and the second main solvent include an aromatic ether.   7. The aromatic ether according to claim 6, wherein the aromatic ether is selected from the group consisting of methylanisole, dimethylanisole, ethylanisole, butylphenylether, butylanisole, pentylanisole, hexylanisole, heptylanisole, octylanisole, and phenoxytoluene. Method for producing a membrane.   The method according to claim 1, wherein the first ink composition and the second ink composition include different polymer compounds.   The method for producing a film according to any one of claims 1 to 8, wherein the polymer compound is a luminescent compound.   A method of manufacturing an organic EL device, comprising a step of manufacturing a film by the method of manufacturing a film according to claim 1. An ink composition set used in the method for producing a film according to any one of claims 1 to 10,
An ink composition set including at least the first ink composition and the second ink composition.

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