WO2024043081A1

WO2024043081A1 - Ink composition, production method for ink composition, and production method for color filter

Info

Publication number: WO2024043081A1
Application number: PCT/JP2023/028951
Authority: WO
Inventors: 義弘野島; 伸司青木; 一也鳶島
Original assignee: 信越化学工業株式会社
Priority date: 2022-08-23
Filing date: 2023-08-08
Publication date: 2024-02-29

Abstract

The present invention is an ink composition containing quantum dots and characterized by containing a silsesquioxane polymer obtained by copolymerizing the quantum dots with silsesquioxane or a silsesquioxane polymer obtained by copolymerizing the quantum dots with alkoxysilane. Consequently, provided is an ink composition which contains quantum dots, can disperse the quantum dots in a high concentration without aggregating, and has high reliability.

Description

Ink composition, method for producing ink composition, and method for producing color filter

The present invention relates to an ink composition, a method for producing an ink composition, and a method for producing a color filter.

Semiconductor crystal particles with a nano-sized particle diameter are called quantum dots, and the excitons generated by light absorption are confined in a nano-sized region, resulting in discrete energy levels of the semiconductor crystal particles, and their band gap. varies depending on the particle size. Due to these effects, the fluorescent light emission of quantum dots has higher brightness, higher efficiency, and sharper light emission than that of general phosphors.
In addition, it has the characteristic that the bandgap changes depending on the particle size, which allows the emission wavelength to be controlled, and is expected to be applied as a wavelength conversion material for solid-state lighting and displays. For example, by using quantum dots as a wavelength conversion material in displays, a wider color gamut and lower power consumption can be achieved than with conventional phosphor materials.

As a mounting method for using quantum dots as a wavelength conversion material, a method has been proposed in which quantum dots are dispersed in a resin material, and the resin material containing quantum dots is laminated with a transparent film to be incorporated into a backlight unit as a wavelength conversion film. (Patent Document 1). In addition, by using quantum dots as a color filter material, the quantum dots absorb monochromatic blue light from the backlight unit and emit red or green light, which functions as a color filter and wavelength conversion material. Adaptation to image elements with excellent reproducibility has also been proposed (Patent Document 2).
A micro LED display in which the backlight unit is replaced with a micro-sized LED array is attracting attention. In micro LED displays, it is required to form color filters on micro-sized LEDs.
In recent years, the size of LED arrays has become smaller, and there is a demand for finer patterning of quantum dots than ever before. Furthermore, in color filter applications, it is also necessary to increase the amount of light absorption of color filters in order to suppress leakage of monochromatic blue light, which is excitation light, from the color filters. In order to increase the amount of light absorbed by the color filter, it is necessary to increase the quantum dot density.
A lithography process using a photosensitive material has been proposed as a method for forming a quantum dot color filter on an LED array (Patent Document 3). However, the photolithography method wastes uncured parts, resulting in a large loss of raw materials, and requires many manufacturing steps such as baking, exposure, and development. Therefore, in recent years, inkjet methods have also been studied. If the inkjet method is used, there is little loss of raw materials, the manufacturing process is simple and requires only ejection and curing, and it is competitive in terms of cost.

Special table 2013-544018 publication Japanese Patent Application Publication No. 2017-021322 JP2021-089347A Special table 2016-518468 publication Special Publication No. 2013-505346 Patent No. 6283092

However, since inkjet ejects ink from a narrow nozzle, in order to form fine patterning of 100 μm or less, which is particularly required for applications such as micro LEDs, the nozzle diameter must be reduced to ensure stable ejection and pattern reproducibility. Therefore, there are major restrictions on the characteristics of the ink. For example, there are the viscosity of the ink, the evaporation rate of the ink, the concentration of the quantum dots that are the solid content contained in the ink, and the aggregation and sedimentation of the quantum dots in the resin solution. If the ink is not within this range, there will be problems such as clogging in the nozzle or ink supply line, and continuous ejection will cause changes and variations in the ejection characteristics, which may cause uneven characteristics between pixels. Become.
In general, polar resin materials such as acrylic resins and silicone resins are dispersed in polar solvents such as PGMEA and PGME, so they have poor compatibility with quantum dots, which are basically hydrophobic, and agglomerate. The occurrence of this is also a major problem. Agglomeration causes blockage in inkjet nozzles and supply lines, which poses a major problem in the process.

Further, in the inkjet method, attempts have been made to apply coating using a small diameter nozzle in order to cope with miniaturization, but when the nozzle becomes small, problems such as clogging and unstable ejection occur. In addition, non-polar solvents are used because quantum dots are hydrophobic, but commonly used non-polar solvents such as toluene and hexane have low boiling points and easily evaporate. Blockage is more likely to occur. This phenomenon becomes particularly noticeable as the quantum dot concentration increases.
High viscosity ink can cause problems such as clogging in the nozzles and ink supply lines, and continuous ejection can cause changes and variations in ejection characteristics, causing uneven characteristics between pixels. Low viscosity ink is essential for stable pattern formation, but as the curable resin and quantum dot content in the ink composition increases, the viscosity of the ink composition generally increases, causing problems during the process. This may cause problems.

Furthermore, since the quantum dots in the resin composition after pattern formation are present in the resin material, unlike the environment in a solution, they are susceptible to desorption of ligands, and their luminescent properties may deteriorate over time. It becomes a problem.
To address these problems, surface coating of quantum dots (Patent Document 4), encapsulation (Patent Document 5), and polyhedral oligomeric silica have been developed to improve dispersibility in polar solvents and resin materials or to improve stability. Various methods have been attempted, such as sesquioxane ligand (Patent Document 6), but all of the problems include dispersibility in resin materials, especially aggregation suppression and stability at high concentrations where the content of quantum dots is 10% by mass or more. It is difficult to achieve both.

The present invention was made in view of the above-mentioned problems, and an object of the present invention is to provide an ink composition containing highly reliable quantum dots that can disperse quantum dots at high concentrations without agglomeration. do.

The present invention has been made to achieve the above object, and is an ink composition containing quantum dots, comprising a silsesquioxane polymer in which the quantum dots are copolymerized with silsesquioxane, or The present invention provides an ink composition comprising a silsesquioxane polymer obtained by copolymerizing the quantum dots and an alkoxysilane.

According to such an ink composition, quantum dots can be dispersed at a high concentration without agglomeration, and an ink composition containing highly reliable quantum dots can be provided.

At this time, it is preferable to use an ink composition in which the surface of the quantum dots is surface-modified with a silane coupling agent.

According to such an ink composition, a silsesquioxane polymer obtained by copolymerizing the quantum dots with silsesquioxane, or a silsesquioxane polymer obtained by copolymerizing the quantum dots and an alkoxysilane. This makes it possible to provide an ink composition that can be easily formed, can disperse quantum dots at high concentration without agglomeration, and has highly reliable quantum dots.

At this time, it is preferable that the alkoxysilane be an ink composition consisting of two or more types of alkoxysilanes each having a different functional group.

According to such an ink composition, the degree of crosslinking of the silsesquioxane polymer can be controlled, the viscosity of the ink composition can be controlled, quantum dots can be dispersed at high concentrations without agglomeration, and reliability is improved. This makes it possible to provide an ink composition containing quantum dots with a high concentration of quantum dots. In addition, the viscosity can be adjusted according to the manufacturing process.

At this time, the ink composition is such that the alkoxysilane is composed of at least two types of alkoxysilanes selected from trialkoxysilane, monoalkoxysilane, and dialkoxysilane, and the viscosity of the ink composition is 1500 mPa·s or less. is preferred.

At this time, it is preferable that the silane coupling agent is an ink composition having one or more of an amino group, a thiol group, a carboxyl group, a phosphino group, a phosphine oxide group, and an ammonium ion.

At this time, the ink in which the silsesquioxane has a reactive substituent of one or more of vinyl group, acrylic group, methacrylic group, hydroxyl group, phenolic hydroxyl group, epoxy group, glycidyl group, and thiol group as a functional group. Preferably, it is a composition.

At this time, the ink composition has one or more reactive substituents of a vinyl group, an acrylic group, a methacrylic group, a hydroxyl group, a phenolic hydroxyl group, an epoxy group, a glycidyl group, and a thiol group as a functional group of the alkoxysilane. It is preferable that

According to such an ink composition, a silsesquioxane polymer obtained by copolymerizing the quantum dots with silsesquioxane, or a silsesquioxane polymer obtained by copolymerizing the quantum dots and an alkoxysilane. Can be easily formed. The quantum dots can be dispersed at high concentrations without agglomeration, and an ink composition containing highly reliable quantum dots can be provided.

The present invention also provides a method for manufacturing a color filter, which comprises forming a color filter by discharging the ink composition described above onto a substrate using an inkjet method.

According to this method of manufacturing a color filter, quantum dots can be dispersed at high concentrations without agglomeration, and an ink composition containing highly reliable quantum dots can be applied onto a substrate by an inkjet method without clogging of nozzles. Color filters can be easily and accurately formed by discharging smoothly without causing any damage.

Furthermore, the present invention includes a step of preparing quantum dots, a step of preparing an alkoxysilane, and the alkoxysilane is silsesquioxane connected to the surface of the quantum dot, and the quantum dot and the silsesquioxane are connected to the surface of the quantum dot. A method for producing an ink composition is provided, the method comprising: forming a copolymer comprising:

According to such a method for producing an ink composition, quantum dots can be dispersed at high concentrations without agglomeration, and an ink composition containing highly reliable quantum dots can be easily and reliably produced. can.

At this time, it is preferable that the method for producing an ink composition is such that the step of preparing the quantum dots includes a step of forming a core, and a step of forming a shell covering the core.

According to such a method for producing an ink composition, quantum dots with a core-shell structure can be easily and reliably produced, quantum dots can be dispersed at high concentrations without agglomeration, and highly reliable quantum dots can be produced. An ink composition comprising:

At this time, the step of forming the copolymer includes a step of surface-modifying the surface of the quantum dots with a silane coupling agent, and a step of applying the silsesquioxane to the surface of the quantum dots via the silane coupling agent. The method for producing an ink composition preferably includes the step of connecting.

According to such a method for producing an ink composition, a silsesquioxane polymer obtained by copolymerizing the quantum dots with silsesquioxane, or a silsesquioxane obtained by copolymerizing the quantum dots and an alkoxysilane. A polymer can be easily formed, quantum dots can be dispersed at high concentration without agglomeration, and an ink composition containing highly reliable quantum dots can be provided.

In order to achieve the above object, the present invention copolymerizes quantum dots and silsesquioxane, or copolymerizes quantum dots and alkoxysilane to form a silsesquioxane polymer, and crosslinks the silsesquioxane polymer. By curing by reaction, highly concentrated quantum dots can be dispersed without agglomeration, and an ink composition containing highly reliable quantum dots can be obtained.
According to the ink composition of the present invention, quantum dots can be dispersed at high concentrations without agglomeration, and the ink composition can contain highly reliable quantum dots.
According to the method for producing an ink composition of the present invention, quantum dots can be dispersed at high concentrations without agglomeration, and an ink composition containing highly reliable quantum dots can be produced.
According to the method for manufacturing a color filter of the present invention, quantum dots can be dispersed at high concentrations without agglomeration, and an ink composition containing highly reliable quantum dots can be applied onto a substrate by an inkjet method to avoid clogging of nozzles. Color filters can be easily and accurately formed by discharging smoothly without causing any damage.

Embodiments of the present invention will be described below, but the present invention is not limited thereto.
As mentioned above, there was a problem of obtaining an inkjet ink composition that can disperse quantum dots at high concentrations without agglomeration, contains highly reliable quantum dots, and is capable of stable ejection. .
Therefore, the inventors of the present invention have conducted extensive studies in order to achieve such a problem. As a result, they came up with an ink composition containing a silsesquioxane polymer obtained by copolymerizing quantum dots and silsesquioxane, or copolymerizing quantum dots and alkoxysilane, and completed the present invention.

(Quantum dot)
In the present invention, the composition and manufacturing method of quantum dots are not particularly limited, and quantum dots can be selected depending on the purpose.

(Composition of quantum dots)
Examples of compositions of quantum dots include II-IV group semiconductors, III-V group semiconductors, II-VI group semiconductors, I-III-VI group semiconductors, II-IV-V group semiconductors, group IV semiconductors, and perovskite semiconductors. Ru.

(Structure of quantum dots)
Further, the structure of the quantum dot may have a core-only structure or a core-shell structure.

(core material)
Specifically, core materials include CdSe, CdS, CdTe, InP, InAs, InSb, AlP, AlAs, AlSb, ZnSe, ZnS, ZnTe, Zn ₃ P ₂ , GaP, GaAs, GaSb, CuInSe ₂ , CuInS ₂ , CuInTe ₂ , CuGaSe ₂ , CuGaS ₂ , CuGaTe ₂ , CuAlSe ₂ , CuAlS ₂ , CuAlTe ₂ , AgInSe ₂ , AgInS 2 , AgInTe, AgGaSe ₂ , AgGaS ₂ , _{AgGaTe 2} _, PbSe, PbS, PbTe, Si, Ge, graphene, CsPbCl ₃ , CsPbBr ₃ , CsPbI ₃ , CH ₃ NH ₃ PbCl ₃ , and those to which these mixed crystals or dopants are added are exemplified.

(shell material)
Shell materials include ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs, AlSb, BeS, BeSe, BeTe, MgS, Examples include MgSe, MgTe, PbS, PbSe, PbTe, SnS, SnSe, SnTe, CuF, CuCl, CuBr, CuI, and mixed crystals thereof.

(Shape of quantum dots)
The quantum dots may be spherical, cubic or rod-shaped. The shape of the quantum dots is not limited and can be freely selected.

(Average particle size of quantum dots)
The particle size of the quantum dots can be appropriately selected depending on the desired wavelength range.
The average particle diameter of the quantum dots is preferably 20 nm or less. If the average particle size is larger than this, the quantum size effect cannot be obtained, the luminous efficiency will drop significantly, and the band gap due to the particle size cannot be controlled.
The particle size of the quantum dots is calculated from the average value of the directional maximum diameter of 20 or more particles, that is, the Feret diameter, by measuring a particle image obtained with a transmission electron microscope (TEM). I can do it. Of course, the method for measuring the average particle diameter is not limited to this, and other methods can be used.

(ligand)
A ligand may be present on the surface of the quantum dot, and the ligand preferably contains an aliphatic hydrocarbon from the viewpoint of dispersibility. Such ligands include, for example, oleic acid, stearic acid, palmitic acid, myristic acid, lauric acid, decanoic acid, octanoic acid, oleylamine, stearyl(octadecyl)amine, dodecyl(lauryl)amine, decylamine, octylamine, octadecane. Examples include thiol, hexadecanethiol, tetradecanethiol, dodecanethiol, decanethiol, octanethiol, trioctylphosphine, trioctylphosphine oxide, triphenylphosphine, triphenylphosphine oxide, tributylphosphine, tributylphosphine oxide, etc. They may be used alone or in combination.

(Silane coupling agent)
Preferably, the surface of the quantum dot is modified with a silane coupling agent.
The silane coupling agent preferably has an amino group, a thiol group, a carboxyl group, a phosphino group, a phosphine oxide group, or an ammonium ion.
As a silane coupling agent, 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, aminophenyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, 3-mercaptopropyl Triethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyl(dimethoxy)methylsilane, triethoxysilylpropylmaleamidic acid, [(3-triethoxysilyl)propyl]succinic anhydride, X-12-1135( (manufactured by Shin-Etsu Chemical Co., Ltd.), diethylphosphatoethyltriethoxysilane, 3-trihydroxypropylmethylphosphonate sodium salt, and trimethyl[3-(trimethoxysilyl)propyl]ammonium chloride.

The ink composition according to the present invention contains a silsesquioxane polymer in which quantum dots are copolymerized with silsesquioxane, or a silsesquioxane polymer in which quantum dots and alkoxysilane are copolymerized.

(Silsesquioxane polymer made by copolymerizing quantum dots with silsesquioxane)
In one embodiment of the present invention, quantum dots surface-modified with a silane coupling agent are copolymerized with silsesquioxane. The method of copolymerization is not particularly limited.
For example, by mixing surface-modified quantum dots and silsesquioxane in a mixed solvent of toluene and ethanol, and adding a small amount of water and a catalyst, the quantum dots and silsesquioxane can be copolymerized. I can do it.
The type of catalyst is not particularly limited, and acids and alkalis can be used.
Examples of the catalyst include formic acid, hydrochloric acid, nitric acid, acetic acid, maleic acid, aqueous ammonia, aqueous sodium hydroxide solution, and tetramethylammonium hydroxide.
Further, the structure of silsesquioxane is not particularly limited and can be appropriately selected depending on the purpose, such as a cage structure, a ladder structure, and a random structure. A random structure is preferable from the viewpoint of dispersibility and uniformity of quantum dots.
Further, the functional groups contained in silsesquioxane are not limited, and may be appropriately substituted depending on the purpose. As a substituent, a substituent that can undergo a polymerization reaction or a crosslinking reaction is particularly preferable from the viewpoint of curability.
Examples of the functional group of silsesquioxane include a vinyl group, an acrylic group, a methacryl group, a hydroxyl group, a phenolic hydroxyl group, an epoxy group, a glycidyl group, and a thiol group.

(silsesquioxane polymer copolymerized with quantum dots and alkoxysilane)
In another embodiment of the present invention, a silsesquioxane polymer is obtained by copolymerizing quantum dots surface-modified with a silane coupling agent and an alkoxysilane. The method of copolymerization is not particularly limited. As a method for synthesizing silsesquioxane, a method described in Non-Patent Document 1 is known.
For example, a silsesquioxane polymer can be obtained by mixing surface-modified quantum dots and alkoxysilane in a mixed solvent of toluene and ethanol, adding a small amount of water and a catalyst, and causing the mixture to react.
The type and amount of catalyst added are not particularly limited, and acids and alkalis can be used.
Examples of the catalyst include formic acid, hydrochloric acid, nitric acid, acetic acid, aqueous ammonia, and tetramethylammonium hydroxide.
The silane coupling agent is not particularly limited and can be appropriately selected depending on the desired resin properties. The silane coupling agent preferably has a vinyl group, allyl group, glycidyl group, phenyl group, acrylic group, methacryl group, or thiol group as a functional group.
Further, an alkoxyrane having not only one type of functional group but two or more types of functional groups may be used.
As a silane coupling agent, trimethoxyvinylsilane, triethoxyvinylsilane, trimethoxy(4-vinylphenyl)silane, allyltriethoxysilane, allyltrimethoxysilane, triethoxy(3-glycidyloxypropyl)silane, 3-glycidyloxypropyltrimethoxy Silane, [8-(glycidyloxy)-n-octyl]trimethoxysilane, KBM-573 (manufactured by Shin-Etsu Chemical Co., Ltd.), (3-methacryloyloxypropyl)triethoxysilane, (3-methacryloyloxypropyl)trimethoxysilane, Examples include methoxysilane, 3-(trimethoxysilyl)propyl acrylate, 3-mercaptopropyltriethoxysilane, and 3-mercaptopropyltrimethoxysilane.
Such a silane coupling agent is preferable because it has high coordination to quantum dots and also has high affinity between silsesquioxane and quantum dots.
It is also preferable because it becomes possible to control the polarity of the quantum dots and the silsesquioxane polymer, and good compatibility with any solvent of the ink composition can be obtained.

Further, the alkoxysilane may include not only trialkoxysilane but also dialkoxysilane and monoalkoxysilane. Trialkoxysilane, dialkoxysilane, and monoalkoxysilane may have the same functional group or different functional groups. By including dialkoxysilane or monoalkoxysilane, it is possible to control the degree of crosslinking of the silsesquioxane obtained by copolymerization, which makes it possible to control the viscosity of the resulting resin composition, which is useful in the manufacturing process. It is also possible to adjust the viscosity accordingly. For example, during the synthesis of silsesquioxane, by mixing the precursor trialkoxysilane with an alkoxysilane having a long-chain alkyl group or a bulky substituent, the crosslinking reaction can be restricted and the viscosity can be lowered.
Further, by mixing dialkoxysilane or monoalkoxysilane with trialkoxysilane, the degree of crosslinking can be lowered to lower the viscosity. The types and ratios of these alkoxysilanes are not particularly limited and can be appropriately selected depending on the purpose.
The viscosity of the ink composition is preferably 1500 mPa·s or less, particularly preferably 1000 mPa·s or less. Note that the lower limit of the viscosity is not particularly limited, but is, for example, 1 mPa·s or more. The viscosity of the ink composition is measured, for example, at 25° C. using a rotational viscometer (DV-I manufactured by Brookfield).
Examples of the functional group of the alkoxysilane include a reactive substituent of one or more of a vinyl group, an acrylic group, a methacryl group, a hydroxyl group, a phenolic hydroxyl group, an epoxy group, a glycidyl group, and a thiol group.

The method for producing an ink composition according to the present invention includes a step 1 of preparing quantum dots, a step 2 of preparing an alkoxysilane, and using the alkoxysilane as silsesquioxane connected to the surface of the quantum dot, and and step 3 of forming a copolymer consisting of quantum dots and the silsesquioxane.
Preferably, Step 1 of preparing quantum dots includes Step 1-1 of forming a core and Step 1-2 of forming a shell covering the core.
Further, step 3 of forming a copolymer includes step 3-1 of surface-modifying the surface of the quantum dots with a silane coupling agent, and adding the silsesquioxane to the surface of the quantum dots via the silane coupling agent. It is preferable to have a step 3-2 of connecting to.

The ink composition of the present invention contains a copolymer of surface-treated quantum dots and silsesquioxane, a crosslinking agent, and a polymerization initiator, and may also contain a solvent, an antioxidant, a light scattering agent, and the like.

(Crosslinking agent)
The crosslinking agent preferably has two or more functional groups that react with the polymerizable substituent contained in the copolymer of quantum dots and silsesquioxane. The amount of the crosslinking agent added is not particularly limited, and the combination of these functional groups is also not particularly limited, and can be appropriately selected depending on the desired curing characteristics.
Examples of radically polymerizable substituents include vinyl groups, acrylic groups, methacrylic groups, and thiol groups, all of which can be suitably used.
Examples of the cationically polymerizable substituent include a hydroxyl group, a phenolic hydroxyl group, an epoxy group, a glycidyl group, an oxetanyl group, an isocyanate group, and any of them can be suitably used.
As a crosslinking agent, dipentaerythritol hexaacrylate, octavinylsilsesquioxane, 2,4,6,8-tetramethyl 2,4,6,8-tetravinylcyclotetrasiloxane, 2,4,6 trimethyl-2 , 4,6-trivinylcyclotrisiloxane, triallylisocyanurate, trimethylolpropane triacrylate, and N,N'-methylenebis(acrylamide).

(Scatterer)
The scatterer can be selected as appropriate depending on the purpose, such as inorganic particles or organic particles, and the particle size and amount added are adjusted to optimize the light extraction efficiency based on the wavelength of the light source used or the emission wavelength and the structure of the wavelength conversion material. This is desirable.
Examples of inorganic particles include silica, zirconia, alumina, barium titanate, and barium sulfate, and examples of organic particles include PMMA, polystyrene, and polycarbonate.

(Polymerization initiator)
The ink composition of the present invention preferably contains a polymerization initiator.
The polymerization initiator may be a thermal or photopolymerization initiator, and any of them can be suitably used depending on the polymerization method.
As the photoradical polymerization initiator, in the Irgacure (registered trademark) series commercially available from BASF, for example, Irgacure 290, Irgacure 651, Irgacure 754, Irgacure 184, Irgacure 2959, Irgacure 907, Irgacure 369, Irgacure 379, Irgacure 819, Irgacure 1173, etc.
In addition, examples of the Darocure (registered trademark) series include TPO, Darocure 1173, and the like.
In addition, it may contain a known thermal radical polymerization initiator or a photocationic polymerization initiator, and is not particularly limited.
The content of the polymerization initiator is preferably 0.1 to 10 parts by weight, more preferably 0.2 to 5 parts by weight, based on 100 parts by weight of the polymer to be added.

(solvent)
The ink composition of the present invention may contain a solvent to improve its coating properties. The solvent is preferably an organic solvent from the viewpoint of compatibility with the quantum dots, and examples thereof include ketones, alkylene glycol ethers, alcohols, and aromatic compounds.
From the group of ketones, such as acetone, methyl ethyl ketone, cyclohexanone, from the group of alkylene glycol ethers: methyl cellosolve (ethylene glycol monomethyl ether), butyl cellosolve (ethylene glycol monobutyl ether), methyl cellosolve acetate, ethyl cellosolve acetate, butyl cellosolve acetate, ethylene glycol mono Propyl ether, ethylene glycol monohexyl ether, ethylene glycol dimethyl ether, diethylene glycol ethyl ether, diethylene glycol diethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, acetic acid propylene glycol monomethyl ether, acetic acid Diethylene glycol methyl ether, diethylene glycol ethyl ether acetate, diethylene glycol propyl ether acetate, diethylene glycol isopropyl acetate, diethylene glycol butyl acetate, diethylene glycol tert-butyl ether acetate, triethylene glycol methyl ether acetate, triethylene glycol ethyl ether acetate, triethylene glycol propyl ether acetate, Methyl alcohol, ethyl alcohol, isopropyl alcohol, n-butyl alcohol, 3-methyl-3-methoxybutanol, etc. from the group of alcohols, such as triethylene glycol isopropyl ether acetate, triethylene glycol butyl acetate, triethylene glycol tert-butyl ether acetate, etc. , and benzene, toluene, xylene from the group of aromatic solvents.
In the inkjet method, solid components such as quantum dots solidify due to the volatilization of the solvent at the nozzle tip, causing blockage of the nozzle tip and making stable ejection impossible. Organic solvents having a boiling point of 100°C or higher are preferred. As such a solvent, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, ethylene glycol, propylene glycol, etc. are preferably used.

(Quantum dot content)
The content of quantum dots can be adjusted as appropriate depending on the desired emission characteristics. The concentration of the quantum dots is preferably adjusted so that the absorption rate of excitation light is 90% or more. Although the optimum concentration varies depending on the characteristics of the quantum dots, it is particularly preferably 10% by weight or more.

The method for producing a color filter according to the present invention is a method in which a color filter is formed by discharging the ink composition according to the present invention onto a substrate using an inkjet method.

(Inkjet device, method, substrate)
By applying an ink composition containing quantum dots produced by the above method onto a substrate using an inkjet device, a wavelength conversion material for use in color filters can be obtained.
The inkjet method is not particularly limited, and can be appropriately selected depending on the ink characteristics, such as a piezo method, a bubble method, or a valve method.
Further, the structure of the inkjet device is similarly not particularly limited, and may be, for example, a single nozzle or a multi-nozzle.
The substrate can be selected as appropriate depending on the purpose. Examples include silicon wafers, glass substrates, resin plates, and resin films. Further, in order to improve the adhesion of the pattern, the substrate may be surface-treated with a silane coupling agent or the like.

(Curing of ink composition)
The ink composition according to the present invention can be a mixture of a silsesquioxane polymer and a curable resin. In this case, the resin layer is cured after the ink composition is discharged onto the substrate. The resin layer can be cured by UV light irradiation if it is a photocurable resin, or by heating the entire substrate if it is a thermosetting resin. It is preferable to adjust the curing conditions according to the resin material and pattern shape.
It is preferable that the thermosetting resin is an acrylic resin having a (meth)acryloyl group in a side chain or a silicone resin containing an acid crosslinkable group. Polymers include polymers derived from acrylic acid, methacrylic acid, acrylic esters, and methacrylic esters, copolymers combining them, polymers with glycidyl (meth)acrylate as a repeating unit, siloxane skeletons, and urethane skeletons. , a silphenylene skeleton, a norbornene skeleton, a fluorene skeleton, and an isocyanurate skeleton can be suitably used, and the polymer to be used may be appropriately selected according to the purpose. For example, polyimide precursors such as acrylic resins, alkyd resins, melamine resins, epoxy resins, silicone resins, polyvinyl alcohol, polyvinylpyrrolidone, polyamides, polyamide-imides, polyimides and their esterification products, tetracarboxylic dianhydrides and diamines. Examples include reaction products with. Furthermore, polymerizable substituents are introduced into these polymers, and curing becomes possible when used in combination with a polymerization initiator. Examples of radically polymerizable substituents include vinyl groups, acrylic groups, methacrylic groups, and thiol groups, all of which can be suitably used. Examples of the cationically polymerizable substituent include a hydroxyl group, a phenolic hydroxyl group, an epoxy group, a glycidyl group, an oxetanyl group, an isocyanate group, and any of them can be suitably used.

Hereinafter, the present invention will be explained in more detail by showing Examples and Comparative Examples of the present invention, but the present invention is not limited thereto. In this example, core-shell quantum dots of InP/ZnSe/ZnS were used as the quantum dot material.

(Step 1 of preparing quantum dots)
(Step 1-1 of forming a core: quantum dot core synthesis step)
Add 0.23 g (0.9 mmol) of palmitic acid, 0.088 g (0.3 mmol) of indium acetate, and 10 mL of 1-octadecene into a flask, and heat and stir at 100°C under reduced pressure to dissolve the raw materials. Deaeration was performed for 1 hour.
After that, nitrogen was purged into the flask, 0.75 mL (0.15 mmol) of a solution prepared by mixing tristrimethylsilylphosphine with trioctylphosphine and adjusted to 0.2M was added, and the temperature was raised to 300°C, and the solution changed from yellow to yellow. It was colored red and it was confirmed that core particles were generated.

(Step 1-2 of forming a shell covering the core: Quantum dot shell layer synthesis step)
Next, 2.85 g (4.5 mmol) of zinc stearate and 15 mL of 1-octadecene were added to another flask, heated and stirred at 100°C under reduced pressure, and degassed for 1 hour while dissolving the zinc stearate octadecene. A solution of 0.3 M was prepared, and 3.0 mL (0.9 mmol) was added to the reaction solution after core synthesis, and the mixture was cooled to 200°C.
Next, 0.474 g (6 mmol) of selenium and 4 mL of trioctylphosphine were added to another flask and heated to 150°C to dissolve them to prepare a 1.5M selenium trioctylphosphine solution, which was cooled to 200°C. While heating the reaction solution after the core synthesis step to 320 °C over 30 minutes, add selenium trioctylphosphine solution in 0.1 mL increments for a total of 0.6 mL (0.9 mmol) and heat at 320 °C for 10 minutes. After being held, it was cooled to room temperature.
0.44 g (2.2 mmol) of zinc acetate was added and dissolved by heating and stirring at 100° C. under reduced pressure. The inside of the flask was again purged with nitrogen, the temperature was raised to 230°C, 0.98 mL (4 mmol) of 1-dodecanethiol was added, and the temperature was maintained for 1 hour.
The obtained solution was cooled to room temperature, and a core-shell quantum dot-containing solution made of InP/ZnSe/ZnS was produced.

(Step 2 of preparing alkoxysilane)
(3-Mercaptopropyl)triethoxysilane 6mL, trimethoxy(3,3,3-trifluoropropyl)silane 1mL, phenyltrimethoxysilane 3mL and (3-mercaptopropyl)triethoxysilane 6mL and phenyltrimethoxysilane 2mL, ethoxy 2 mL of trimethylsilane and 6 mL of (3-methacryloyloxypropyl)trimethoxysilane and 2 mL of phenyltrimethoxysilane, 2 mL of ethoxytrimethylsilane and 7 mL of 3-aminopropyltrimethoxysilane, 1 mL of dodecyltrimethoxysilane and 2 mL of ethoxytrimethylsilane and (3- 10 mL of methacryloyloxypropyl)trimethoxysilane was prepared.

(Step 3 of using alkoxysilane as silsesquioxane connected to the surface of quantum dots to form a copolymer consisting of quantum dots and silsesquioxane)
(Step 3-1 of modifying the surface of quantum dots with a silane coupling agent: Surface treatment of quantum dots)
After the reaction was completed, the mixture was cooled to room temperature, ethanol was added to precipitate the reaction solution, centrifuged, and the supernatant was removed.
A similar purification was performed once more and dispersed in toluene.
A toluene solution of quantum dots was placed in a nitrogen-substituted flask.
0.24 mL (1.0 mmol) of (3-mercaptopropyl)triethoxysilane was added thereto, and the mixture was stirred at room temperature for 24 hours.

(Step 3-2 (1) of connecting silsesquioxane to the surface of quantum dots via a silane coupling agent: Copolymerization of quantum dots and silsesquioxane 1)
In a nitrogen-substituted flask, add 6 mL of (3-mercaptopropyl)triethoxysilane, 1 mL of trimethoxy(3,3,3-trifluoropropyl)silane, 3 mL of phenyltrimethoxysilane, and the surface-treated quantum dot solution as solid concentration. Then, 20 mL of toluene and 10 mL of methanol were mixed, and 4.0 mL of 1.0N hydrochloric acid was added dropwise little by little while stirring at room temperature.
After the dropwise addition, the mixture was stirred at room temperature for 60 minutes, and then the solution temperature was raised to 60° C. and reacted for 60 minutes under reflux.
Thereafter, a copolymer (1) of quantum dots and silsesquioxane was obtained by vacuuming at 60° C. for 180 minutes and distilling off the solvent in the system.

(Step 3-2 (2) of connecting silsesquioxane to the surface of quantum dots via a silane coupling agent: Copolymerization of quantum dots and silsesquioxane 2)
Add 6 mL of (3-mercaptopropyl)triethoxysilane, 2 mL of phenyltrimethoxysilane, 2 mL of ethoxytrimethylsilane, and a surface-treated quantum dot solution to a nitrogen-substituted flask so that the solid content concentration is 20 parts by mass, Further, 20 mL of toluene and 10 mL of methanol were added and mixed.
Thereto, 4.0 mL of 1.0N hydrochloric acid was added dropwise little by little while stirring at room temperature.
After the dropwise addition, the mixture was stirred at room temperature for 60 minutes, and then the solution temperature was raised to 60° C. and reacted for 60 minutes under reflux.
Thereafter, the solvent was distilled off while flowing nitrogen through the system at 40° C., thereby obtaining a copolymer (2) of quantum dots and silsesquioxane.

(Step 3-2 (3) of connecting silsesquioxane to the surface of quantum dots via a silane coupling agent: Copolymerization of quantum dots and alkylsilane 3)
Add 6 mL of (3-methacryloyloxypropyl)trimethoxysilane, 2 mL of phenyltrimethoxysilane, 2 mL of ethoxytrimethylsilane, and a surface-treated quantum dot solution to a nitrogen-substituted flask so that the solid content was 20 parts by mass. Further, 20 mL of toluene and 10 mL of methanol were added and mixed.
Thereto, 4.0 mL of 1.0N hydrochloric acid was added dropwise little by little while stirring at room temperature.
After the dropwise addition, the mixture was stirred at room temperature for 60 minutes, and then the solution temperature was raised to 60° C. and reacted for 60 minutes under reflux.
Thereafter, the solvent was distilled off while flowing nitrogen through the system at 40° C., thereby obtaining a copolymer (3) of quantum dots and silsesquioxane.

(Step 3-2 (4) of connecting silsesquioxane to the surface of quantum dots via a silane coupling agent: Copolymerization of quantum dots and alkylsilane 4)
7 mL of 3-aminopropyltrimethoxysilane, 1 mL of dodecyltrimethoxysilane, 2 mL of ethoxytrimethylsilane, and a surface-treated quantum dot solution were added to a nitrogen-substituted flask so that the solid content was 20% by mass, and then toluene was added. 20 mL and 10 mL of methanol were added and mixed.
Thereto, 4.0 mL of 1.0N hydrochloric acid was added dropwise little by little while stirring at room temperature.
After the dropwise addition, the mixture was stirred at room temperature for 60 minutes, and then the solution temperature was raised to 60° C. and reacted for 60 minutes under reflux.
Thereafter, the solvent was distilled off while flowing nitrogen through the system at 40° C., thereby obtaining a copolymer (4) of quantum dots and silsesquioxane.

(Step 3-2 (5) of connecting silsesquioxane to the surface of quantum dots via a silane coupling agent: Copolymerization of quantum dots and alkylsilane 5)
10 mL of (3-methacryloyloxypropyl)trimethoxysilane and the surface-treated quantum dot solution were added to a nitrogen-substituted flask so that the solid content concentration was 20 parts by mass, and 20 mL of toluene and 10 mL of methanol were added and mixed. .
Thereto, 4.0 mL of 1.0N hydrochloric acid was added dropwise little by little while stirring at room temperature.
After the dropwise addition, the mixture was stirred at room temperature for 60 minutes, and then the solution temperature was raised to 60° C. and reacted for 60 minutes under reflux.
Thereafter, the solvent was distilled off while flowing nitrogen through the system at 40° C., thereby obtaining a copolymer (5) of quantum dots and silsesquioxane.

(Synthesis of silsesquioxane crosslinking agent)
10 mL of trimethoxyvinylsilane, 20 mL of toluene, and 10 mL of methanol were mixed in a flask purged with nitrogen, and 4.0 mL of 1.0N hydrochloric acid was added dropwise little by little while stirring at room temperature.
After the dropwise addition, the mixture was stirred at room temperature for 60 minutes, and then the solution temperature was raised to 60° C. and reacted for 60 minutes under reflux.
Thereafter, the system was evacuated at 60° C. for 2 hours to distill off the solvent.
Silsesquioxane having a vinyl group was obtained in the flask (crosslinking agent (1)).

In a flask purged with nitrogen, 10 mL of (3-methacryloyloxypropyl)trimethoxysilane, 20 mL of toluene, and 10 mL of methanol were mixed, and 4.0 mL of 1.0N hydrochloric acid was added dropwise little by little while stirring at room temperature.
After the dropwise addition, the mixture was stirred at room temperature for 60 minutes, and then the solution temperature was raised to 60° C. and reacted for 60 minutes under reflux.
Thereafter, the system was evacuated at 60° C. for 2 hours to distill off the solvent.
Silsesquioxane having methacrylic groups was obtained in the flask (crosslinking agent (2)).

In a flask purged with nitrogen, 10 mL of (3-glycidyloxypropyl)trimethoxysilane, 20 mL of toluene, and 10 mL of methanol were mixed, and 4.0 mL of 1.0N hydrochloric acid was added dropwise little by little while stirring at room temperature.
After the dropwise addition, the mixture was stirred at room temperature for 60 minutes, and then the solution temperature was raised to 60° C. and reacted for 60 minutes under reflux.
Thereafter, the system was evacuated at 60° C. for 2 hours to distill off the solvent.
Silsesquioxane having a glycidyl group was obtained in the flask (crosslinking agent (3)).

(Example 1)
Quantum dot/silsesquioxane copolymer (1) was weighed so that it contained 20 wt% of quantum dots as a nonvolatile fraction, and octavinylsilsesquioxane was used as a crosslinking agent to crosslink the mercapto groups in the copolymer. The agent was added so that the molar ratio of vinyl groups was 1:1.
Further, 1 part by mass of Irgacure 1173 was weighed out and mixed with 100 parts by mass of the nonvolatile content of this mixture.
Furthermore, propylene glycol monomethyl ether acetate was added as a solvent so that the solid content concentration was 50% to prepare an ink composition.
The viscosity of this ink composition was measured using a rotational viscometer and was 1429 mPa·s (measured at 25° C.).

(Example 2)
Quantum dot/silsesquioxane copolymer (1) was weighed so that it contained 20 wt% of quantum dots in terms of nonvolatile fraction, and the crosslinking agent (1) was added to the mercapto groups in the copolymer and the crosslinking agent. The molar ratio of vinyl groups was 1:1.
Further, 1 part by mass of Irgacure 1173 was weighed out and mixed with 100 parts by mass of the nonvolatile content of this mixture.
Furthermore, propylene glycol monomethyl ether acetate was added as a solvent so that the solid content concentration was 50% to prepare an ink composition.
The viscosity of this ink composition was measured using a rotational viscometer and was 1047 mPa·s (measured at 25° C.).

(Example 3)
Quantum dot/silsesquioxane copolymer (1) was weighed so that it contained 20 wt% of quantum dots as a nonvolatile fraction, and crosslinking agent (2) was added as a crosslinking agent to the mercapto groups in the copolymer and the crosslinking agent. The molar ratio of methacrylic groups was 1:1.
Further, 1 part by mass of Irgacure 1173 was weighed out and mixed with 100 parts by mass of the nonvolatile content of this mixture.
Furthermore, propylene glycol monomethyl ether acetate was added as a solvent so that the solid content concentration was 50% to prepare an ink composition.
The viscosity of this ink composition was measured using a rotational viscometer and was 896 mPa·s (measured at 25° C.).

(Example 4)
Quantum dot/silsesquioxane copolymer (2) was weighed so that it contained 20 wt% of quantum dots as a nonvolatile fraction, and crosslinking agent (1) was added as a crosslinking agent to the mercapto groups in the copolymer and the crosslinking agent. The molar ratio of vinyl groups was 1:1.
Furthermore, 1 part by mass of Irgacure 1173 was weighed out and mixed with 100 parts by mass of the nonvolatile content of this mixture.
Further, propylene glycol monomethyl ether acetate was added as a solvent so that the solid content concentration was 50% to prepare an ink composition.
The viscosity of this ink composition was measured using a rotational viscometer and was 788 mPa·s (measured at 25° C.).

(Example 5)
Quantum dot/silsesquioxane copolymer (2) was weighed so that it contained 20 wt% of quantum dots as a nonvolatile fraction, and the crosslinking agent (2) was added to the mercapto groups in the copolymer and the crosslinking agent. The molar ratio of vinyl groups was 1:1.
Further, 1 part by mass of Irgacure 1173 was weighed out and mixed with 100 parts by mass of the nonvolatile content of this mixture.
Furthermore, propylene glycol monomethyl ether acetate was added as a solvent so that the solid content concentration was 50% to prepare an ink composition.
The viscosity of this ink composition was measured using a rotational viscometer and was 1024 mPa·s (measured at 25° C.).

(Example 6)
Quantum dot/silsesquioxane copolymer (3) was weighed so that it contained 20 wt% of quantum dots as a nonvolatile fraction, and crosslinking agent (2) was added to the methacrylic group in the copolymer and the crosslinking agent. The molar ratio of methacrylic groups was 1:1.
Further, 1 part by mass of Irgacure 1173 was weighed out and mixed with 100 parts by mass of the nonvolatile content of this mixture.
Furthermore, propylene glycol monomethyl ether acetate was added as a solvent so that the solid content concentration was 50% to prepare an ink composition.
The viscosity of this ink composition was measured using a rotational viscometer and was 652 mPa·s (measured at 25° C.).

(Example 7)
Weigh the quantum dot/silsesquioxane copolymer (4) so that it contains 20 wt% of quantum dots as a nonvolatile fraction, and mix the crosslinking agent (3) with the amino groups in the copolymer and the crosslinking agent. were added so that the molar ratio of epoxy groups was 1:1.
Further, 1 part by mass of Irgacure 1173 was weighed out and mixed with 100 parts by mass of the nonvolatile content of this mixture.
Furthermore, propylene glycol monomethyl ether acetate was added as a solvent so that the solid content concentration was 50% to prepare an ink composition.
The viscosity of this ink composition was measured using a rotational viscometer and was 795 mPa·s (measured at 25° C.).

(Comparative example 1)
Quantum dots subjected to surface treatment alone were weighed so that they contained 20 wt% of quantum dots in terms of nonvolatile fraction, and crosslinking agent (1) was added as a crosslinking agent to the mercapto group in the surface treatment QD solution and the vinyl group of the crosslinking agent. They were added so that the molar ratio was 1:1.
Further, 1 part by mass of Irgacure 1173 was weighed out and mixed with 100 parts by mass of the nonvolatile content of this mixture.
Furthermore, propylene glycol monomethyl ether acetate was added as a solvent so that the solid content concentration was 50% to prepare an ink composition.
The viscosity of this ink composition was measured using a rotational viscometer and was 1393 mPa·s (measured at 25° C.).

(Comparative example 2)
An ink composition was prepared by changing the solvent in Comparative Example 1 to toluene.
The viscosity of this ink composition was measured using a rotational viscometer and was 1411 mPa·s (measured at 25° C.).

Each of the ink compositions obtained in Examples 1 to 7 and Comparative Examples 1 to 2 was discharged onto a glass substrate at a pitch of 150 μm using an inkjet device (LaboJet-600Bio manufactured by Microjet Co., Ltd.).
After the discharge, the substrate was cured by irradiating light with a wavelength of 365 nm and an output of 500 mW/cm ² in an air atmosphere.
When the pattern remaining on the substrate was measured using a laser microscope (Olympus Corporation OLS-4100), it was confirmed that a dot-like pattern with an average thickness of 5 μm and a pattern size of 50 μm was formed.

(Discharge stability)
A pattern of 10 locations per row was continuously ejected in 5 rows, and when the nozzle or supply line became clogged or the ink ejected poorly during the continuous operation, and the ejection became unstable, it was evaluated as "×".
(Dispersibility evaluation)
Aggregates in the pattern were confirmed using an electron microscope.
Those with aggregates with a size of 1 μm or more were evaluated as ×, and those with no aggregates or with a size of less than 1 μm were evaluated as ○.

(Pattern evaluation)
The formed island patterns were observed, and those in which defects such as irregularity in pattern size and shape, chipping of the pattern, or deviation in pattern size occurred were evaluated as "×".

(Evaluation of luminescence characteristics of formed pattern)
Using LabRAM Time Evolution manufactured by Horiba Techno Service Co., Ltd., the patterned samples prepared in the above Examples and Comparative Examples were irradiated with 457 nm laser light (0.03 mW), and the photoconverted island pattern area was measured. , the emission intensity, emission wavelength, and half-width of the photoconverted light were measured.

(Reliability evaluation)
The resulting pattern was treated at 85° C. and 85% RH (relative humidity) for 250 hours, and the fluorescence efficiency after treatment was measured to confirm the rate of decrease from the initial level and evaluate its reliability.

Tables 1 and 2 show the evaluation results of Examples and Comparative Examples.

From the results in Tables 1 and 2, it was confirmed that in the comparative example, the nozzle was clogged due to the occurrence of viscosity and agglomeration, making the ejection of the ink composition unstable, and pattern defects were also observed.

On the other hand, in Examples, the ejection was stable, there were no pattern defects, and good patterning properties were exhibited.
Further, when comparing the reliability test results, it can be seen that the stability of the Examples is improved compared to the Comparative Example, and the change over time is suppressed.

As described above, it was confirmed that by using the ink composition of the present invention, a wavelength conversion material with stable luminescent properties and high reliability could be obtained.

The specification includes the following aspects.
[1]: An ink composition containing quantum dots, comprising a silsesquioxane polymer in which the quantum dots are copolymerized with silsesquioxane, or a silsesquioxane polymer in which the quantum dots and an alkoxysilane are copolymerized. An ink composition comprising an oxane polymer.
[2]: The ink composition of [1] above, wherein the surface of the quantum dots is surface-modified with a silane coupling agent.
[3]: The ink composition of [1] or [2] above, wherein the alkoxysilane is composed of two or more types of alkoxysilanes each having a different functional group.
[4]: The alkoxysilane is composed of at least two types of alkoxysilanes selected from trialkoxysilane, monoalkoxysilane, and dialkoxysilane, and the viscosity of the ink composition is 1500 mPa·s or less. The ink composition of the above [1], the above [2] or the above [3].
[5]: The ink composition of [2] above, wherein the silane coupling agent has one or more of an amino group, a thiol group, a carboxyl group, a phosphino group, a phosphine oxide group, and an ammonium ion. .
[6]: The silsesquioxane has as a functional group one or more reactive substituents of a vinyl group, an acrylic group, a methacrylic group, a hydroxyl group, a phenolic hydroxyl group, an epoxy group, a glycidyl group, and a thiol group. The ink composition according to any one of [1] to [5] above, characterized in that:
[7]: The alkoxysilane has one or more reactive substituents as a functional group of a vinyl group, an acrylic group, a methacrylic group, a hydroxyl group, a phenolic hydroxyl group, an epoxy group, a glycidyl group, and a thiol group. The ink composition according to any one of the above [1] to [6].
[8]: A method for producing a color filter, which comprises forming a color filter by discharging the ink composition according to any one of [1] to [7] above onto a substrate by an inkjet method.
[9]: a step of preparing quantum dots, a step of preparing an alkoxysilane, the alkoxysilane is silsesquioxane connected to the surface of the quantum dot, and the quantum dot and the silsesquioxane are 1. A method for producing an ink composition, comprising: forming a copolymer.
[10]: The method for producing an ink composition according to [9] above, wherein the step of preparing the quantum dots includes a step of forming a core, and a step of forming a shell covering the core.
[11]: The step of forming the copolymer includes a step of surface-modifying the surface of the quantum dot with a silane coupling agent, and a step of modifying the surface of the quantum dot with the silsesquioxane via the silane coupling agent. The method for producing an ink composition according to [9] or [10] above, characterized by comprising the step of connecting to.

Note that the present invention is not limited to the above embodiments. The above-mentioned embodiments are illustrative, and any embodiment that has substantially the same configuration as the technical idea stated in the claims of the present invention and has similar effects is the present invention. covered within the technical scope of.

Claims

An ink composition containing quantum dots, wherein the quantum dots are copolymerized with a silsesquioxane polymer, or the quantum dots and an alkoxysilane are copolymerized. An ink composition comprising:
The ink composition according to claim 1, wherein the surface of the quantum dot is surface-modified with a silane coupling agent.
The ink composition according to claim 1, wherein the alkoxysilane is composed of two or more types of alkoxysilanes each having a different functional group.
2. The ink composition according to claim 1, wherein the alkoxysilane is composed of at least two types of alkoxysilanes selected from trialkoxysilane, monoalkoxysilane, and dialkoxysilane, and the viscosity of the ink composition is 1500 mPa·s or less. The ink composition described.
The ink composition according to claim 2, wherein the silane coupling agent has one or more of an amino group, a thiol group, a carboxyl group, a phosphino group, a phosphine oxide group, and an ammonium ion.
The silsesquioxane has, as a functional group, one or more reactive substituents selected from a vinyl group, an acrylic group, a methacrylic group, a hydroxyl group, a phenolic hydroxyl group, an epoxy group, a glycidyl group, and a thiol group. The ink composition according to claim 1.
A claim characterized in that the functional group of the alkoxysilane has one or more reactive substituents of a vinyl group, an acrylic group, a methacrylic group, a hydroxyl group, a phenolic hydroxyl group, an epoxy group, a glycidyl group, and a thiol group. Item 1. The ink composition according to item 1.
A method for producing a color filter, comprising discharging the ink composition according to any one of claims 1 to 7 onto a substrate by an inkjet method to form a color filter.
a step of preparing quantum dots,
preparing an alkoxysilane;
An ink composition characterized by comprising the step of using the alkoxysilane as silsesquioxane connected to the surface of the quantum dot, and forming a copolymer consisting of the quantum dot and the silsesquioxane. manufacturing method.
The step of preparing the quantum dots includes:
a step of forming a core;
10. The method for producing an ink composition according to claim 9, further comprising the step of forming a shell that covers the core.
The step of forming the copolymer comprises:
surface-modifying the surface of the quantum dot with a silane coupling agent;
10. The method for producing an ink composition according to claim 9, further comprising the step of connecting the silsesquioxane to the surface of the quantum dot via the silane coupling agent.