JP6981083B2 - Ink composition and its manufacturing method, light conversion layer and color filter - Google Patents

Description

The present invention relates to an ink composition, a method for producing the same, an optical conversion layer, and a color filter.

Conventionally, a color filter pixel portion in a display such as a liquid crystal display device uses, for example, a curable resist material containing red organic pigment particles or green organic pigment particles and an alkali-soluble resin and / or an acrylic monomer. , Has been manufactured by photolithography.

In recent years, there has been a strong demand for lower power consumption of displays, and instead of the red organic pigment particles or green organic pigment particles, luminescent nanocrystal particles such as quantum dots, quantum rods, and other inorganic phosphor particles have been strongly demanded. A method of forming a color filter pixel portion such as a red pixel and a green pixel by using the above is actively studied.

By the way, the method for manufacturing a color filter by the above photolithography method has a drawback that a resist material other than a pixel portion including relatively expensive luminescent nanocrystal particles is wasted due to the characteristics of the manufacturing method. Under such circumstances, in order to eliminate the waste of the resist material as described above, it has begun to be studied to form the pixel portion of the optical conversion substrate by the inkjet method.

In such an ink composition, it is known that various thermosetting resins are used, and most of the thermosetting resins are high-viscosity liquids or solids, so that they can be easily handled. , It is often in the form of being dissolved or dispersed in an organic solvent. There is no knowledge as to what characteristics can be selected and used to reduce the defects of the optical conversion layer made of the cured product, and any thermosetting resin and organic solvent can be used, respectively. The actual situation was that the light conversion layer was formed by curing the light conversion layer, and various characteristic items were measured for the light conversion layer, and the presence or absence of defects was confirmed by trial and error.

For example, the quantum dot ink composed of luminescent nanocrystal particles has a problem that oxygen in the air dissolves and deteriorates.

Patent Document 1 discloses a formulation containing a solvent saturated or supersaturated with an inert gas and a functional organic material, and discloses a formulation in which the total amount of oxygen and water is below a certain level.

However, this Patent Document 1 does not describe the use of a thermosetting resin.

Moreover, the actual measurement data of the water content was not shown, and it was unclear how much water content affected and how much.

Further, regarding the organic light emitting material for OLED, the influence of the atmosphere is shown in the examples, but there is no disclosure as to whether or not a specific technical effect is exhibited with respect to the quantum dot composed of luminescent nanocrystal particles, and the quantum dot. It was unclear how much technical effect it had. Further, the OLED light emitting material shown in the examples does not have a wavelength conversion function and cannot be diverted to an optical conversion layer using quantum dots.

In addition, when a solvent saturated or supersaturated with an inert gas is used, bubbles are generated in the flow path of the coating liquid when the coating liquid is sent to the coater head or nozzle for coating by using a pump. Problems such as air bubbles being mixed in the coating liquid and the coating material becoming defective occur. Further, when it is used as an inkjet ink, there is a big problem that bubbles are generated in the printing head of the inkjet printer and ejection defects occur.

Patent Document 2 discloses a composition containing quantum dots that are substantially free of oxygen. However, the IJ method is not described, and the application of the optical conversion layer to a color filter (CF) for an LCD is not described.

In the IJ method, ink is ejected from the nozzle of the printing head into the atmosphere, exposed to oxygen in the air, and exposed to the atmosphere even after printing. Since the CF substrate has a large area, creating an inert gas atmosphere in the vicinity of the head portion or on the printed surface on the printing substrate has a problem that the device price and the running cost are significantly increased. Therefore, even if the ink is exposed to oxygen in the atmosphere, an ink with less deterioration in the performance of quantum dots has been desired.

Therefore, there has been a demand for an ink having less deterioration of quantum dots and less generation of bubbles during liquid feeding or in the IJ head.

It should be noted that Patent Document 3 discloses that an inert gas is introduced to expel dissolved oxygen to degas the oxygen, and that the oxygen is degassed by depressurization. It also discloses that the emission of oxygen-free quantum dot (QD) compositions is less likely to deteriorate.

However, when the IJ printing ink or the ink curing film is exposed to the atmosphere, the QD is exposed to oxygen in the atmosphere. In such a case, deterioration cannot be suppressed by a known method, and a QD composition or a cured product thereof, which is advantageous for IJ printing, is desired.

Although Patent Documents 2 and 3 describe that an acrylate monomer or an oligomer can be used as the photocurable compound, the monomer actually used in the experiment has a length such as dodecanediol di (meth) acrylate. Only di (meth) acrylates containing chain alkylene atomic groups. These are not thermosetting resins.

Special Table 2016-501430 Gazette US Published Patent 2014/0027673 Specification WO2013 / 122820 Gazette

Since the ink composition using luminescent nanocrystal particles and the light conversion layer using the ink composition are unstable with respect to oxygen in the atmosphere, it is necessary to improve the stability.

It is an object of the present invention to provide an ink composition having improved stability against oxygen, a method for producing the same, and a light conversion layer and a color filter using the ink composition.

The present invention provides the inventions of the following embodiments, respectively.

According to the ink composition of 1 below, since the organic solvent in the specific LogP value range is used as the organic solvent and the dissolved oxygen concentration at the temperature of 23 ° C. is in the specific range, no problem occurs in the cured product. For example, it can improve stability in the atmosphere.

1. 1. Contains luminescent nanocrystal particles, thermosetting resin and organic solvent,
The organic solvent has a LogP value of -1.0 or more and 6.5 or less, and is characterized in that the dissolved oxygen concentration at a temperature of 23 ° C. exceeds 0 and is 6 mg / L based on Japanese Industrial Standards JIS K0102. Ink composition to be used.
2. 2. Contains luminescent nanocrystal particles, thermosetting resin and organic solvent,
The LogP value of the organic solvent is −1.0 or more and 6.5 or less, and the LogP value is −1.0 or more and 6.5 or less.
An ink composition based on Japanese Industrial Standards JIS K0102, wherein the dissolved oxygen concentration at a temperature of 23 ° C. exceeds 0 and is 6 mg / L.
3. 3. Contains luminescent nanocrystal particles, thermosetting resin and organic solvent,
The LogP value of the organic solvent is −1.0 or more and 6.5 or less, and the LogP value is −1.0 or more and 6.5 or less.
An inkjet ink composition based on Japanese Industrial Standards JIS K0102, wherein the dissolved oxygen concentration at a temperature of 23 ° C. exceeds 0 and is 6 mg / L.
4. 3. The method for producing an inkjet ink composition according to the above 3, wherein the method for producing the ink composition is characterized by removing oxygen gas from the ink composition.
5. The inkjet ink composition according to the above 3, wherein the dissolved oxygen concentration at a temperature of 23 ° C. exceeds 0 and is 0.4 mg / L based on Japanese Industrial Standards JIS K0102.
6. The inkjet ink composition according to any one of 3 or 5 above, wherein the thermosetting resin is alkaline insoluble.
7. The inkjet ink composition according to any one of 3, 5 or 6 above, which is capable of forming an alkali-insoluble coating film.
8. The inkjet ink composition according to any one of 3, 5, 6 or 7, wherein the surface tension is 20 to 40 mN / m.
9. The inkjet ink composition according to any one of 3, 5, 6, 7 or 8 having a viscosity of 2 to 20 mPa · s.
10. The inkjet ink composition according to any one of 3, 5, 6, 7, 8 or 9, further containing a solvent having a boiling point of 180 ° C. or higher.
11. The inkjet ink composition according to any one of 3, 5, 6, 7, 8, 9 or 10 for a color filter.

12. An optical conversion layer made of a cured product of the ink composition according to any one of 1 to 3 above.
13. A light conversion layer in which the light conversion layer made of the cured product of the ink composition according to any one of the first to third paragraphs is alkali-insoluble.
14. An optical conversion layer having a plurality of pixel portions.
The plurality of pixel portions are optical conversion layers having pixel portions including a cured product of the inkjet ink composition according to any one of 3, 5, 6, 7, 8, 9 or 10.
15. Further, a light-shielding portion provided between the plurality of pixel portions is further provided.
The plurality of pixel portions are
The cured product is contained, and the luminescent nanocrystal particles include luminescent nanocrystal particles that absorb light having a wavelength in the range of 420 to 480 nm and emit light having a emission peak wavelength in the range of 605 to 665 nm. , The first pixel part,
The cured product is contained, and the luminescent nanocrystal particles include luminescent nanocrystal particles that absorb light having a wavelength in the range of 420 to 480 nm and emit light having a emission peak wavelength in the range of 500 to 560 nm. The optical conversion layer according to any one of 12 to 14, further comprising a second pixel portion.
16. The optical conversion layer according to any one of 12 to 15, wherein the plurality of pixel portions further include a third pixel portion having a transmittance of 30% or more for light having a wavelength in the range of 420 to 480 nm.
17. A color filter comprising the optical conversion layer according to any one of 12 to 16.

It is possible to provide an ink composition having improved stability in the atmosphere, a method for producing the same, and an optical conversion layer and a color filter using the ink composition.

FIG. 1 is a schematic cross-sectional view of a color filter according to an embodiment of the present invention.

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

<Ink composition>
The ink composition of the embodiment is
It contains luminescent nanocrystal particles, a thermosetting resin, and an organic solvent, the LogP value of the organic solvent is -1.0 or more and 6.5 or less, and the dissolved oxygen concentration at a temperature of 23 ° C. based on JIS K0102 is It is characterized by being 0 to 6 mg / L.

The ink composition of one embodiment is an ink composition for a color filter used for forming a pixel portion of a color filter by, for example, a photolithography method, an inkjet method, or the like.

The ink composition of one embodiment is suitably used for an application of forming a color filter pixel portion by an inkjet method.

When a color filter pixel portion is formed by, for example, an inkjet method using a conventional ink composition, there is a problem that the light conversion layer is deteriorated when exposed to oxygen in the atmosphere.

On the other hand, according to the ink composition of the embodiment, such a problem can be improved.

Hereinafter, an ink composition for a color filter (inkjet ink for a color filter) used in an inkjet method will be described as an example.

[Luminescent nanocrystal particles]
The luminescent nanocrystal particles are nano-sized crystals that absorb excitation light and emit fluorescence or phosphorescence, and for example, the maximum particle size measured by a transmission electron microscope or a scanning electron microscope is 100 nm or less. It is a crystal.

The luminescent nanocrystal particles can emit light (fluorescence or phosphorescence) having a wavelength different from the absorbed wavelength, for example, by absorbing light having a predetermined wavelength. The luminescent nanocrystal particles may be red luminescent nanocrystal particles that emit light having an emission peak wavelength in the range of 605 to 665 nm (red light), and may be light having an emission peak wavelength in the range of 500 to 560 nm. It may be a green light emitting nanocrystal particle that emits (green light), or may be a blue light emitting nanocrystal particle that emits light (blue light) having an emission peak wavelength in the range of 420 to 480 nm. .. In one embodiment, the ink composition preferably comprises at least one of these luminescent nanocrystal particles. The light absorbed by the luminescent nanocrystal particles may be, for example, light having a wavelength in the range of 400 nm or more and less than 500 nm (blue light) or light having a wavelength in the range of 200 nm to 400 nm (ultraviolet light). The emission peak wavelength of the luminescent nanocrystal particles can be confirmed, for example, in the fluorescence spectrum or the phosphorescence spectrum measured by using an ultraviolet-visible spectrophotometer.

The red-emitting nanocrystal particles are 665 nm or less, 663 nm or less, 660 nm or less, 658 nm or less, 655 nm or less, 653 nm or less, 651 nm or less, 650 nm or less, 647 nm or less, 645 nm or less, 643 nm or less, 640 nm or less, 637 nm or less, 635 nm or less. It is preferable to have an emission peak wavelength of 632 nm or less or 630 nm or less, and it is preferable to have an emission peak wavelength of 628 nm or more, 625 nm or more, 623 nm or more, 620 nm or more, 615 nm or more, 610 nm or more, 607 nm or more or 605 nm or more. These upper limit values and lower limit values can be arbitrarily combined. In the same description below, the upper limit value and the lower limit value described individually can be arbitrarily combined.

Green luminescent nanocrystal particles have emission peak wavelengths of 560 nm or less, 557 nm or less, 555 nm or less, 550 nm or less, 547 nm or less, 545 nm or less, 543 nm or less, 540 nm or less, 537 nm or less, 535 nm or less, 532 nm or less, or 530 nm or less. It is preferable to have an emission peak wavelength of 528 nm or more, 525 nm or more, 523 nm or more, 520 nm or more, 515 nm or more, 510 nm or more, 507 nm or more, 505 nm or more, 503 nm or more, or 500 nm or more.

Blue luminescent nanocrystal particles have emission peak wavelengths of 480 nm or less, 477 nm or less, 475 nm or less, 470 nm or less, 467 nm or less, 465 nm or less, 463 nm or less, 460 nm or less, 457 nm or less, 455 nm or less, 452 nm or less, or 450 nm or less. It is preferable to have an emission peak wavelength at 450 nm or more, 445 nm or more, 440 nm or more, 435 nm or more, 430 nm or more, 428 nm or more, 425 nm or more, 422 nm or more, or 420 nm or more.

The wavelength of light emitted by luminescent nanocrystal particles (emission color) depends on the size (for example, particle size) of the luminescent nanocrystal particles according to the solution of the Schrodinger wave equation of the well-type potential model, but the luminescent nanocrystal particles It also depends on the energy gap of the crystal particles. Therefore, the emission color can be selected by changing the constituent material and size of the luminescent nanocrystal particles to be used.

The luminescent nanocrystal particles may be luminescent nanocrystal particles (luminescent semiconductor nanocrystal particles) containing a semiconductor material. Examples of the luminescent semiconductor nanocrystal particles include quantum dots (hereinafter, also referred to as “QD”), quantum rods, and the like. Among these, quantum dots are preferable from the viewpoints that the emission spectrum can be easily controlled, reliability can be ensured, production cost can be reduced, and mass productivity can be improved.

The luminescent semiconductor nanocrystal particles may consist only of a core containing the first semiconductor material, and include a core containing the first semiconductor material and a second semiconductor material different from the first semiconductor material, as described above. It may have a shell that covers at least a portion of the core. In other words, the structure of the luminescent semiconductor nanocrystal particles may be a structure consisting of only a core (core structure) or a structure consisting of a core and a shell (core / shell structure). Further, the luminescent semiconductor nanocrystal particles include a third semiconductor material different from the first and second semiconductor materials in addition to the shell (first shell) containing the second semiconductor material, and the above-mentioned core. It may further have a shell (second shell) that covers at least a part of it. In other words, the structure of the luminescent semiconductor nanocrystal particles may be a structure including a core, a first shell, and a second shell (core / shell / shell structure). Each of the core and the shell may be a mixed crystal containing two or more kinds of semiconductor materials (for example, CdSe + CdS, CIS + ZnS, etc.).

The luminescent nanocrystal particles are selected as the semiconductor material from the group consisting of II-VI group semiconductors, III-V group semiconductors, I-III-VI group semiconductors, IV group semiconductors and I-II-IV-VI group semiconductors. It is preferable to include at least one kind of semiconductor material.

Specific semiconductor materials include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeDZn. CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, CdHgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSeTe, CdHgSeTe, AlHgSte, HgZnS InP, InAs, InSb, PLUP, PLGAs, VMwareSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb; SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSte,
PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, SnPbSTe; Si, Ge, SiC, SiGe, AgInSe 2, CuGaSe 2, CuInS 2, CuGaS 2, CuInSe 2, AgInS 2, AgGaSe 2, AgGaS 2, Examples include C, Si and Ge. The luminescent semiconductor nanocrystal particles have CdS, CdSe, CdTe, ZnS, from the viewpoint that the emission spectrum can be easily controlled, reliability can be ensured, production cost can be reduced, and mass productivity can be improved. _{ZnSe, ZnTe, ZnO, HgS,} HgSe, HgTe, InP, InAs, InSb, GaP, GaAs, GaSb, AgInS 2, AgInSe 2, AgInTe 2, AgGaS 2, AgGaSe 2, AgGaTe 2, CuInS 2, CuInSe 2, CuInTe 2 , CuGaS ₂ , CuGaSe ₂ , CuGaTe ₂ , Si, C, Ge and Cu ₂ ZnSnS ₄ preferably comprises at least one selected from the group.

Examples of the red-emitting semiconductor nanocrystal particles include CdSe nanocrystal particles, CdSe rod-shaped nanocrystal particles, and rod-shaped nanocrystal particles having a core-shell structure, wherein the shell portion is CdS. The inner core portion is CdSe nanocrystal particles and rod-shaped nanocrystal particles having a core-shell structure, and the shell portion is CdS and the inner core portion is ZnSe nanocrystal particles and the core-shell structure is provided. Nanocrystal particles having a shell portion of CdS and an inner core portion of CdSe, and nanocrystal particles having a core-shell structure, wherein the shell portion is CdS and an inner core portion. Is ZnSe, nanocrystal particles in which CdSe and ZnS are mixed, rod-shaped nanocrystals in which CdSe and ZnS are mixed, InP nanocrystal particles, InP nanocrystal particles, InP rod. Nanocrystal particles of the shape, nanocrystal particles of mixed crystal of CdSe and CdS, rod-shaped nanocrystal particles of mixed crystal of CdSe and CdS, nanocrystal particles of mixed crystal of ZnSe and CdS, ZnSe and CdS Examples thereof include mixed crystal rod-shaped nanocrystal particles.

Examples of the green light emitting semiconductor nanocrystal particles include CdSe nanocrystal particles, CdSe rod-shaped nanocrystal particles, mixed crystal nanoparticles of CdSe and ZnS, and rod-shaped mixed crystals of CdSe and ZnS. Nanocrystal particles and the like can be mentioned.

Examples of the blue-emitting semiconductor nanocrystal particles include ZnSe nanocrystal particles, ZnSe rod-shaped nanocrystal particles, ZnS nanocrystal particles, ZnS rod-shaped nanocrystal particles, and nanocrystals having a core-shell structure. Nanocrystal particles having a shell portion of ZnSe and an inner core portion of ZnS, and rod-shaped nanocrystals having a core-shell structure, the shell portion of which is ZnSe and an inner core portion of the particles. Examples thereof include ZnS nanocrystal particles, CdS nanocrystal particles, and CdS rod-shaped nanocrystal particles. The semiconductor nanocrystal particles have the same chemical composition, and by changing the average particle size of the particles themselves, the color to be emitted from the particles can be changed to red or green. Further, it is preferable to use semiconductor nanocrystal particles as such, which have as little adverse effect on the human body as possible. When semiconductor nanocrystal particles containing cadmium, selenium, etc. are used as luminescent nanocrystal particles, semiconductor nanocrystal particles containing the above elements (cadmium, selenium, etc.) as little as possible are selected and used alone, or the above elements. It is preferable to use it in combination with other luminescent nanocrystal particles so that the amount is as small as possible.

The shape of the luminescent nanocrystal particles is not particularly limited, and may be any geometric shape or any irregular shape. The shape of the luminescent nanocrystal particles may be, for example, spherical, ellipsoidal, pyramidal, disc-like, branch-like, net-like, rod-like, or the like. However, as the luminescent nanocrystal particles, using particles having less directionality as the particle shape (for example, particles having a spherical shape, a regular tetrahedron shape, etc.) can further improve the uniformity and fluidity of the ink composition. Is preferable.

The average particle size (volume average diameter) of the luminescent nanocrystal particles may be 1 nm or more, and may be 1.5 nm, from the viewpoint of easily obtaining light emission of a desired wavelength and from the viewpoint of excellent dispersibility and storage stability. It may be more than 2 nm and may be 2 nm or more. From the viewpoint that a desired emission wavelength can be easily obtained, it may be 40 nm or less, 30 nm or less, or 20 nm or less. The average particle diameter (volume average diameter) of the luminescent nanocrystal particles is obtained by measuring with a transmission electron microscope or a scanning electron microscope and calculating the volume average diameter.

From the viewpoint of dispersion stability, the luminescent nanocrystal particles preferably have an organic ligand on the surface thereof. The organic ligand may be coordinate-bonded to, for example, the surface of the luminescent nanocrystal particles. In other words, the surface of the luminescent nanocrystal particles may be passivated by an organic ligand. Further, the luminescent nanocrystal particles may have a polymer dispersant on the surface thereof. In one embodiment, for example, the organic ligand is removed from the luminescent nanocrystalline particles having the above-mentioned organic ligand, and the organic ligand is exchanged with the polymer dispersant to cause the polymer dispersant on the surface of the luminescent nanoparticles. May be combined. However, from the viewpoint of dispersion stability when the ink jet ink is used, it is preferable that the polymer dispersant is blended with the luminescent nanocrystal particles in which the organic ligand is coordinated.

Examples of the organic ligand include TOP (trioctylphosphine), TOPO (trioctylphosphine oxide), oleic acid, oleylamine, octylamine, trioctylamine, hexadecylamine, octanethiol, dodecanethiol, and hexylphosphonic acid ( HPA), tetradecylphosphonic acid (TDPA), and octylphosphinic acid (OPA).

As the luminescent nanocrystal particles, those dispersed in a colloidal form in an organic solvent can be used. The surface of the luminescent nanocrystal particles dispersed in the organic solvent is preferably passivated by the above-mentioned organic ligand. Examples of the organic solvent include cyclohexane, hexane, heptane, chloroform, toluene, octane, chlorobenzene, tetralin, diphenyl ether, propylene glycol monomethyl ether acetate, butyl carbitol acetate, or a mixture thereof.

Commercially available products can be used as the luminescent nanocrystal particles. Examples of commercially available luminescent nanocrystal particles include indium phosphide / zinc sulfide, D-dot, CuInS / ZnS from NN-Labs, and InP / ZnS from Aldrich.

The content of the luminescent nanocrystal particles may be 5% by mass or more, or 10% by mass or more, based on the mass of the non-volatile content of the ink composition, from the viewpoint of being more excellent in the effect of reducing leakage light. , 15% by mass or more, 20% by mass or more, 30% by mass or more, or 40% by mass or more. The content of the luminescent nanocrystal particles may be 70% by mass or less, 60% by mass or less, 55 by mass, based on the mass of the non-volatile content of the ink composition from the viewpoint of excellent ejection stability. It may be 50% by mass or less, or 50% by mass or less. In the present specification, the "mass of the non-volatile component of the ink composition" refers to the mass obtained by subtracting the mass of the organic solvent from the total mass of the ink composition.

By the way, the luminescent nanocrystal particles have high reactivity because they have surface atoms that can serve as coordination sites. Luminescent nanocrystal particles have such high reactivity and have a large surface area as compared with general pigments, so that particles are likely to aggregate. Since the luminescent nanocrystal particles emit light due to the quantum size effect, a quenching phenomenon occurs when the particles are aggregated, which causes a decrease in the fluorescence quantum yield and a decrease in brightness and color reproducibility. On the other hand, in the present embodiment, since the ink composition contains a polymer dispersant, the luminescent nanocrystal particles are unlikely to aggregate. Therefore, in the present embodiment, the content of the luminescent nanocrystal particles can be within the above range.

[Light scattering particles]
The ink composition of one embodiment may contain light scattering particles. When a color filter pixel portion (hereinafter, also simply referred to as “pixel portion”) is formed by an ink composition using luminescent nanocrystal particles, the light from the light source is not absorbed by the luminescent nanocrystal particles and the pixel portion is formed. May leak from. Since such leaked light reduces the color reproducibility of the pixel portion, when the pixel portion is used as the optical conversion layer, it is preferable to reduce the leaked light as much as possible. The light-scattering particles are preferably used in order to prevent light leakage from the pixel portion. The light-scattering particles are, for example, optically inert inorganic particles. The light-scattering particles can scatter the light from the light source irradiated to the color filter pixel portion.

Materials constituting the light-scattering particles include, for example, simple metal such as tungsten, zirconium, titanium, platinum, bismuth, rhodium, palladium, silver, tin, platinum and gold; silica, barium sulfate, barium carbonate, calcium carbonate, etc. Metal oxides such as talc, titanium oxide, clay, kaolin, barium sulfate, barium carbonate, calcium carbonate, alumina white, titanium oxide, magnesium oxide, barium oxide, aluminum oxide, bismuth oxide, zirconium oxide, zinc oxide; magnesium carbonate, Metal carbonates such as barium carbonate, bismuth subcarbonate, calcium carbonate; metal hydroxides such as aluminum hydroxide; composite oxides such as barium zirconate, calcium zirconate, calcium titanate, barium titanate, strontium titanate, etc. Examples thereof include metal salts such as bismuth subnitrate. The light-scattering particles preferably contain at least one selected from the group consisting of titanium oxide, alumina, zirconium oxide, zinc oxide, calcium carbonate, barium sulfate and silica from the viewpoint of being more excellent in reducing light leakage. It is more preferable to contain at least one selected from the group consisting of titanium oxide, barium sulfate and calcium carbonate.

The shape of the light-scattering particles may be spherical, filamentous, indefinite, or the like. However, as the light-scattering particles, it is possible to use particles having less directional particle shape (for example, particles having a spherical shape, a regular tetrahedron shape, etc.) to improve the uniformity, fluidity, and light scattering property of the ink composition. It is preferable in that it can be enhanced.

The average particle diameter (volume average diameter) of the light-scattering particles in the ink composition may be 0.05 μm or more, or 0.2 μm or more, from the viewpoint of being more excellent in the effect of reducing leakage light. It may be 0.3 μm or more. The average particle diameter (volume average diameter) of the light-scattering particles in the ink composition may be 1.0 μm or less, 0.6 μm or less, or 0, from the viewpoint of excellent ejection stability. It may be 0.4 μm or less. The average particle diameter (volume average diameter) of the light-scattering particles in the ink composition is 0.05 to 1.0 μm, 0.05 to 0.6 μm, 0.05 to 0.4 μm, 0.2 to 1 It may be 0.0 μm, 0.2 to 0.6 μm, 0.2 to 0.4 μm, 0.3 to 1.0 μm, 0.3 to 0.6 μm, or 0.3 to 0.4 μm. From the viewpoint that such an average particle diameter (volume average diameter) can be easily obtained, the average particle diameter (volume average diameter) of the light-scattering particles used may be 50 nm or more, and may be 1000 nm or less. The average particle diameter (volume average diameter) of the light-scattering particles is obtained by measuring with a dynamic light-scattering nanotrack particle size distribution meter and calculating the volume average diameter. Further, the average particle diameter (volume average diameter) of the light-scattering particles to be used can be obtained by measuring the particle diameter of each particle with, for example, a transmission electron microscope or a scanning electron microscope, and calculating the volume average diameter.

The content of the light-scattering particles may be 0.1% by mass or more, or even 1% by mass or more, based on the mass of the non-volatile content of the ink composition from the viewpoint of being more excellent in the effect of reducing leakage light. It may be 5% by mass or more, 7% by mass or more, 10% by mass or more, or 12% by mass or more. The content of the light-scattering particles may be 60% by mass or less, and 50% by mass, based on the mass of the non-volatile content of the ink composition from the viewpoint of excellent effect of reducing leakage light and excellent ejection stability. It may be less than or equal to 40% by mass, may be 30% by mass or less, may be 25% by mass or less, may be 20% by mass or less, and may be 15% by mass. It may be as follows. In the present embodiment, since the ink composition contains a polymer dispersant, the light-scattering particles can be satisfactorily dispersed even when the content of the light-scattering particles is within the above range.

The mass ratio of the content of the light-scattering particles to the content of the luminescent nanocrystal particles (light-scattering particles / luminescent nanocrystal particles) is 0.1 to 5.0. The mass ratio (light-scattering particles / luminescent nanocrystal particles) may be 0.2 or more, or 0.5 or more, from the viewpoint of being more excellent in the effect of reducing leaked light. The mass ratio (light-scattering particles / luminescent nanocrystal particles) may be 2.0 or less, and may be 1.5 or less, from the viewpoint of excellent light leakage reduction effect and excellent continuous ejection property during inkjet printing. May be. The mass ratio (light-scattering particles / luminescent nanocrystal particles) is 0.1 to 2.0, 0.1 to 1.5, 0.2 to 5.0, 0.2 to 2.0, 0. It may be 2 to 1.5, 0.5 to 5.0, 0.5 to 2.0, or 0.5 to 1.5. The reduction of leaked light by the light-scattering particles is considered to be due to the following mechanism. That is, in the absence of light-scattering particles, the backlight light only travels almost straight through the pixel portion and is considered to have little chance of being absorbed by the luminescent nanocrystal particles. On the other hand, when the light-scattering particles are present in the same pixel portion as the luminescent nanocrystal particles, the backlight light is scattered in all directions in the pixel portion, and the luminescent nanocrystal particles can receive the light. Even if the same backlight is used, it is considered that the amount of light absorption in the pixel portion increases. As a result, it is considered that such a mechanism makes it possible to prevent light leakage.

[Polymer dispersant]
The ink composition of one embodiment preferably contains a polymer dispersant. The polymer dispersant can uniformly disperse the light-scattering particles in the ink.

In the present invention, the polymer dispersant is a polymer compound having a weight average molecular weight of 750 or more and having a functional group having an affinity for light-scattering particles, and has a function of dispersing the light-scattering particles. Have. In the polymer dispersant, the polymer dispersant is adsorbed on the light-scattering particles via a functional group having an affinity for the light-scattering particles, and the polymer dispersants undergo electrostatic repulsion and / or steric repulsion between the polymer dispersants. Light-scattering particles are dispersed in the ink composition. The polymer dispersant is preferably bound to the surface of the light-scattering particles and adsorbed to the light-scattering particles, but is bound to the surface of the luminescent nanoparticles and adsorbed to the luminescent nanoparticles. It may be free in the ink composition.

Examples of the functional group having an affinity for light-scattering particles include an acidic functional group, a basic functional group and a nonionic functional group. The acidic functional group has a dissociative proton and may be neutralized by a base such as an amine or a hydroxide ion, and the basic functional group is neutralized by an acid such as an organic acid or an inorganic acid. May be.

Examples of the acidic functional group include a carboxyl group (-COOH), a sulfo group (-SO ₃ H), a sulfate group (-OSO ₃ H), a phosphonic acid group (-PO (OH) ₃ ), and a phosphate group (-OPO (-OPO)). OH) ₃ ), phosphinic acid group (-PO (OH)-), mercapto group (-SH), and the like.

Examples of the basic functional group include primary, secondary and tertiary amino groups, ammonium groups, imino groups, and nitrogen-containing heterocyclic groups such as pyridine, pyrimidine, pyrazine, imidazole, and triazole.

The nonionic functional group, hydroxy group, an ether group, a thioether group, a sulfinyl group (-SO-), a sulfonyl group _(-SO 2 -), a carbonyl group, a formyl group, an ester group, carbonic ester group, an amide group, Examples thereof include a carbamoyl group, a ureido group, a thioamide group, a thioureido group, a sulfamoyl group, a cyano group, an alkenyl group, an alkynyl group, a phosphin oxide group and a phosphin sulfide group.

Acidic functionality from the viewpoint of dispersion stability of light-scattering particles, less likely to cause the side effect of sedimentation of luminescent nanocrystal particles, ease of synthesis of polymer dispersant, and stability of functional groups. As the group, a carboxyl group, a sulfo group, a phosphonic acid group and a phosphoric acid group are preferably used, and as a basic functional group, an amino group is preferably used. Among these, a carboxyl group, a phosphonic acid group and an amino group are more preferably used, and most preferably an amino group is used.

Polymer dispersants with acidic functional groups have an acid value. The acid value of the polymer dispersant having an acidic functional group is preferably 1 to 150 mgKOH / g in terms of solid content. When the acid value is 1 or more, sufficient dispersibility of the light-scattering particles can be easily obtained, and when the acid value is 150 or less, the storage stability of the pixel portion (cured product of the ink composition) is unlikely to decrease. ..

Further, the polymer dispersant having a basic functional group has an amine value. The amine value of the polymer dispersant having a basic functional group is preferably 1 to 200 mgKOH / g in terms of solid content. When the amine value is 1 or more, sufficient dispersibility of the light-scattering particles can be easily obtained, and when the amine value is 200 or less, the storage stability of the pixel portion (cured product of the ink composition) is unlikely to decrease. ..

The polymer dispersant may be a polymer (homopolymer) of a single monomer, or may be a copolymer (copolymer) of a plurality of types of monomers. Further, the polymer dispersant may be any of a random copolymer, a block copolymer or a graft copolymer. When the polymer dispersant is a graft copolymer, it may be a comb-shaped graft copolymer or a star-shaped graft copolymer. The polymer dispersant may be, for example, acrylic resin, polyester resin, polyurethane resin, polyamide resin, polyether, phenol resin, silicone resin, polyurea resin, amino resin, polyamine such as polyethyleneimine and polyallylamine, epoxy resin, polyimide and the like. It may be there.

Commercially available products can be used as the polymer dispersant, and the commercially available products include Ajinomoto Fine-Techno Co., Ltd.'s Azispar PB series, BYK's DISPERBYK series, BYK-series, and BASF's Efka series. Etc. can be used.

Examples of commercially available products include "DISPERBYK-130", "DISPERBYK-161", "DISPERBYK-162", "DISPERBYK-163", "DISPERBYK-164", "DISPERBYK-166", and "DISPERBYK-" manufactured by Big Chemie. 167 ”,“ DISPERBYK-168 ”,“ DISPERBYK-170 ”,“ DISPERBYK-171 ”,“ DISPERBYK-174 ”,“ DISPERBYK-180 ”,“ DISPERBYK-182 ”,“ DISPERBYK-183 ”,“ DISPERBYK-184 ” , "DISPERBYK-185", "DISPERBYK-2000", "DISPERBYK-2001", "DISPERBYK-2008", "DISPERBYK-2009", "DISPERBYK-2020", "DISPERBYK-2022", "DISPERBYK-2025" DISPERBYK-2050 "," DISPERBYK-2070 "," DISPERBYK-2096 "," DISPERBYK-2150 "," DISPERBYK-2155 "," DISPERBYK-2163 "," DISPERBYK-2164 "," BYK-LPN21116 "and" BYK-LPN21116 " LPN6919 ”; BASF's“ EFKA4010 ”,“ EFKA4015 ”,“ EFKA4046 ”,“ EFKA4047 ”,“ EFKA4061 ”,“ EFKA4080 ”,“ EFKA4300 ”,“ EFKA4310 ”,“ EFKA4320 ”,“ EFKA4320 ” , "EFKA4560", "EFKA4585", "EFKA5207", "EFKA1501", "EFKA1502", "EFKA1503" and "EFKA PX-4701"; , "Solspers 13650", "Solspers 13940", "Solspers 11200", "Solspers 13940", "Solspers 16000", "Solspers 17000", "Solspers 18000", "Solspers 20000", "Solspers 21000", "Solspers 24000" , "Sol Sparse 26000", "Sol Sparse 27000", "Sol Sparse 28000", "Sol Sparse 32000" , "Sol Sparse 32500", "Sol Sparse 32550", "Sol Spur 32600", "Sol Sparse 33000", "Sol Sparse 34750", "Sol Sparse 35100", "Sol Sparse 35200", "Sol Sparse 36000", "Sol Sparse 37500", "Sol Sparse 38500" , "Solspur 39000", "Solspers 41000", "Solspers 54000", "Solspers 71000" and "Solspers 76500"; PN411 "and" PA111 "; Evonik's" TEGO Dispers 650 "," TEGO Dispers 660C "," TEGO Dispers 662C "," TEGO Dispers 670 "," TEGO Dispers 685 "," TEGO Dispers 685 "," TEGO Dis "Disparon DA-703-50", "DA-705", "DA-725" and the like manufactured by Kusumoto Kasei can be used.

As the polymer dispersant, in addition to the commercially available products as described above, a cationic monomer containing a basic group and / or an anionic monomer having an acidic group, a monomer having a hydrophobic group, and other monomers as necessary. A product synthesized by copolymerizing with (a nonionic monomer, a monomer having a hydrophilic group, etc.) can be used. For details of the cationic monomer, the anionic monomer, the monomer having a hydrophobic group and other monomers, the monomers described in paragraphs 0034 to 0036 of JP-A-2004-250502 can be mentioned.

Further, for example, a compound obtained by reacting a polyester compound with a polyalkyleneimine described in JP-A-54-37082, JP-A-61-174939, etc., and a polyallylamine described in JP-A-9-169821. A compound in which the amino group of the side chain is modified with polyester, a graft polymer containing the polyester-type macromonomer described in JP-A-9-171253 as a copolymerization component, and the addition of a polyester polyol described in JP-A-60-166318. Polyurethane and the like are preferably mentioned.

The weight average molecular weight of the polymer dispersant may be 750 or more, and may be 1000 or more, from the viewpoint that light-scattering particles can be satisfactorily dispersed and the effect of reducing leakage light can be further improved. It may be 2000 or more, and may be 3000 or more. The weight average molecular weight of the polymer dispersant can satisfactorily disperse light-scattering particles, further improve the effect of reducing leakage light, and can eject the viscosity of the inkjet ink, which is suitable for stable ejection. From the viewpoint of viscosity, it may be 100,000 or less, 50,000 or less, or 30,000 or less. In the present specification, the weight average molecular weight is a polystyrene-equivalent weight average molecular weight measured by GPC (Gel Permeation Chromatography).

From the viewpoint of the dispersibility of the light-scattering particles, the content of the polymer dispersant may be 0.5 parts by mass or more with respect to 100 parts by mass of the light-scattering particles, and may be 2 parts by mass or more. It may be 5 parts by mass or more. The content of the polymer dispersion may be 50 parts by mass or less and 30 parts by mass or less with respect to 100 parts by mass of the light-scattering particles from the viewpoint of moist heat stability of the pixel portion (cured product of the ink composition). It may be 10 parts by mass or less.

[Thermosetting resin]
In the present embodiment, the thermosetting resin is a resin that functions as a binder in a cured product and is crosslinked and cured by heat. Thermosetting resins have curable groups. Examples of the curable group include an epoxy group, an oxetane group, an isocyanate group, an amino group, a carboxyl group, a methylol group, etc. For example, an epoxy group is preferable from the viewpoint of excellent adhesion to a black matrix) and a substrate. The thermosetting resin may have one kind of curable group or may have two or more kinds of curable groups.

Among the thermosetting resins, a resin having photoradical polymerizable property (polymerized by irradiation with light when used together with a photoradical polymerization initiator) and a photocationic polymerizable resin (photocationic polymerization). Contains resins (polymerized by light irradiation when used with initiators).

The thermosetting resin may be a polymer (homopolymer) of a single monomer, or may be a copolymer (copolymer) of a plurality of types of monomers. Further, the thermosetting resin may be any of a random copolymer, a block copolymer or a graft copolymer.

As the thermosetting resin, a compound having two or more thermosetting functional groups in one molecule is used, and it is usually used in combination with a curing agent. When a thermosetting resin is used, a catalyst (curing accelerator) capable of accelerating the thermosetting reaction may be further added. In other words, the ink composition may contain a thermosetting component including a thermosetting resin (as well as a curing agent and a curing accelerator used as needed). In addition to these, a polymer that does not have a polymerization reactivity by itself may be further used.

As the compound having two or more thermosetting functional groups in one molecule, for example, an epoxy resin having two or more epoxy groups in one molecule (hereinafter, also referred to as “polyfunctional epoxy resin”) may be used. The "epoxy resin" includes both a monomeric epoxy resin and a polymer epoxy resin. The number of epoxy groups contained in one molecule of the polyfunctional epoxy resin is preferably 2 to 50, more preferably 2 to 20. The epoxy group may be any structure as long as it has an oxylan ring structure, and may be, for example, a glycidyl group, an oxyethylene group, an epoxycyclohexyl group, or the like. Examples of the epoxy resin include known polyvalent epoxy resins that can be cured by a carboxylic acid. Such epoxy resins are widely disclosed in, for example, "Epoxy Resin Handbook" edited by Masaki Shinbo, published by Nikkan Kogyo Shimbun (1987), and these can be used.

Examples of the thermosetting resin having an epoxy group (including a polyfunctional epoxy resin) include a polymer of a monomer having an oxylan ring structure and a copolymer of a monomer having an oxylan ring structure and another monomer. Examples of the monomer include various epoxy group-containing monomers such as glycidyl (meth) acrylate, β-methylglycidyl (meth) acrylate, glycidyl vinyl ether, and allyl glycidyl ether; (2-oxo-1,3-oxolan). ) (2-oxo-1,3-oxolan) group-containing vinyl monomers such as methyl (meth) acrylate; 3,4-epoxide cyclohexyl (meth) acrylate, 3,4-epoxide cyclohexylmethyl (meth) acrylate , 3,4-Epoxide Cyclohexylethyl (meth) acrylates and the like, various alicyclic epoxy group-containing vinyl monomers and the like.

On the other hand, examples of the ethylenically unsaturated double bond-containing monomer include various aromatic vinyls such as styrene, α-methylstyrene and vinyltoluene; and methyl acrylate, ethyl acrylate, butyl acrylate and cyclohexyl acrylate. Various acrylic acid esters; various methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, tert-butyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate; ethylene, propylene, butene-1 Various α-olefins such as vinyl chloride, various halogenated olefins (halo-olefins) excluding fluoroolefins such as vinyl chloride and vinylidene chloride; dimethyl fumarate, diethyl fumarate, dibutyl fumarate, dioctyl fumarate , Dimethyl maleate, diethyl maleate, dibutyl maleate, dioctyl maleate, dimethyl itaconic acid, diethyl itaconic acid, dibutyl itaconic acid, dioctyl itaconic acid, and various unsaturated dicarboxylic acids, which have 1 to 18 carbon atoms. Diesters with monovalent alcohols; vinyl acetate, vinyl propionate, vinyl butyrate, vinyl isobutyrate, vinyl caproate, vinyl caprylate, vinyl caprate, vinyl laurate, branched (branched) with 9 carbon atoms. Examples thereof include various aliphatic vinyl carboxylic acids such as vinyl aliphatic carboxylate, branched aliphatic carboxylate vinyl having 10 carbon atoms, branched aliphatic carboxylate vinyl having 11 carbon atoms, and vinyl stearate.

Specific examples of the polyfunctional epoxy resin include polyglycidyl methacrylate, methyl methacrylate-glycidyl methacrylate copolymer, benzyl methacrylate-glycidyl methacrylate copolymer, n-butyl methacrylate-glycidyl methacrylate copolymer, and 2-hydroxyethyl methacrylate-glycidyl. Examples thereof include a methacrylate copolymer, a (3-ethyl-3-oxetanyl) methyl methacrylate-glycidyl methacrylate copolymer, and a styrene-glycidyl methacrylate. Further, as the thermosetting resin of the present embodiment, the compounds described in paragraphs 0044 to 0066 of JP-A-2014-56248 can also be used.

It is preferable that the homopolymer or copolymer of the monomer having such an oxylane ring structure is a two-dimensional (linear) copolymer from the viewpoint of ease of handling and production, for example, without a solvent. Alternatively, in an organic solvent, glycidyl (meth) acrylate is used as an essential component, and ethylenically unsaturated monomers such as aromatic vinyl and (meth) acrylic acid ester, which are known and conventional copolymerizable ethylenically unsaturated monomers, are ethylenically unsaturated. It can be obtained by polymerizing a monomer containing one double bond and a monomer containing two or more ethylenically unsaturated double bonds, if necessary. By adjusting the combined ratio of glycidyl (meth) acrylate and other ethylenically unsaturated monomers, a copolymer having a desired epoxy group content can be obtained, or a copolymerizable ethylenically unsaturated monomer can be obtained. What kind of polymer should be selected and used? Depending on the average molecular weight of the whole, the refractive index, glass transition temperature, flexibility, transparency, solubility in organic solvent, etc. of the copolymer can be determined. Can be adjusted. The copolymerization ratio of the monomer containing an aromatic ring such as aromatic vinyl is, for example, the refractive index of the produced copolymer, and the alkyl chain length of the (meth) acrylic acid ester is the flexibility and support of the produced copolymer. It affects the adhesion to such things. Such a copolymer is, for example, a known and conventional copolymerizable ethylenically unsaturated single amount containing the above glycidyl (meth) acrylate as an essential component in an organic solvent in the specific LogP value range of the present invention described later. The body can be easily obtained by polymerizing until the desired molecular weight is obtained so that the glycisyl group does not open. Of course, the copolymer may be prepared in an organic solvent outside the specific LogP value range described later, and the organic solvent on the left may be replaced with an organic solvent within the specific LogP value range described later. ..

Examples of the polyfunctional epoxy resin include bisphenol A type epoxy resin, bisphenol F type epoxy resin, brominated bisphenol A type epoxy resin, bisphenol S type epoxy resin, diphenyl ether type epoxy resin, hydroquinone type epoxy resin, and naphthalene type epoxy. Resin, biphenyl type epoxy resin, fluorene type epoxy resin, phenol novolac type epoxy resin, orthocresol novolac type epoxy resin, trishydroxyphenylmethane type epoxy resin, trifunctional epoxy resin, tetraphenylol ethane type epoxy resin, dicyclopentadiene Phenolic type epoxy resin, hydrogenated bisphenol A type epoxy resin, bisphenol A nucleated polyol type epoxy resin, polypropylene glycol type epoxy resin, glycidyl ester type epoxy resin, glycidylamine type epoxy resin, glioxal type epoxy resin, alicyclic epoxy resin , A heterocyclic epoxy resin, etc. can be used.

More specifically, a bisphenol A type epoxy resin such as the product name "Epicoat 828" (manufactured by Japan Epoxy Resin), a bisphenol F type epoxy resin such as the product name "YDF-175S" (manufactured by Toto Kasei Co., Ltd.), and a product name. Brominated bisphenol A type epoxy resin such as "YDB-715" (manufactured by Toto Kasei Co., Ltd.), bisphenol S type epoxy resin such as trade name "EPICLON EXA1514" (manufactured by DIC Co., Ltd.), trade name "YDC-1312" ( Hydroquinone type epoxy resin such as Toto Kasei Co., Ltd.), Naphthalene type epoxy resin such as trade names "EPICLON EXA4032", "HP-4770", "HP-4700", "HP-5000" (manufactured by DIC Co., Ltd.), Biphenyl type epoxy resin such as product name "Epicoat YX4000H" (manufactured by Japan Epoxy Resin), bisphenol A type novolak epoxy resin such as product name "Epicoat 157S70" (manufactured by Japan Epoxy Resin), product name "Epicoat 154" (manufactured by Japan Epoxy Resin) Japan Epoxy Resin), phenol novolac type epoxy resin such as product name "YDPN-638" (Toto Kasei Co., Ltd.), cresol novolak type epoxy resin such as product name "YDCN-701" (Toto Kasei Co., Ltd.), product Dicyclopentadienephenol type epoxy resin such as the names "EPICLON HP-7200" and "HP-7200H" (manufactured by DIC Co., Ltd.), and trishydroxyphenylmethane type such as the trade name "Epicoat 1032H60" (manufactured by Japan Epoxy Resin). Epoxy resin, trifunctional epoxy resin such as trade name "VG3101M80" (manufactured by Mitsui Kagaku Co., Ltd.), tetraphenylol ethane type epoxy resin such as trade name "Epicoat 1031S" (manufactured by Japan Epoxy Resin), trade name "Denacol EX" 4-functional epoxy resin such as "-411" (manufactured by Nagase Kasei Kogyo Co., Ltd.), hydrogenated bisphenol A type epoxy resin such as trade name "ST-3000" (manufactured by Toto Kasei Co., Ltd.), trade name "Epicoat 190P" (Japan Epoxy) Glycidyl ester type epoxy resin such as resin), glycidylamine type epoxy resin such as trade name "YH-434" (manufactured by Toto Kasei Co., Ltd.), glioxal type such as trade name "YDG-414" (manufactured by Toto Kasei Co., Ltd.) Epoxy resin, alicyclic polyfunctional epoxy compound such as trade name "Epolide GT-401" (manufactured by Daicel Chemical Co., Ltd.), triglycidyl isocyanate (TGI) Examples thereof include heterocyclic epoxy resins such as C). Further, if necessary, the trade name "Neo Tote E" (manufactured by Toto Kasei Co., Ltd.) or the like can be mixed as the epoxy reactive diluent.

The polyfunctional epoxy resins include "Findick A-247S", "Findick A-254", "Findick A-253", "Findick A-229-30A", and "Findick A-229-30A" manufactured by DIC Corporation. "Findick A-261", "Findick A249", "Findick A-266", "Findick A-241", "Findick M-8020", "Epoxy N-740", "Epoxy N-770", "Epoxylon N-865" (trade name) or the like can be used.

When a polyfunctional epoxy resin having a relatively small molecular weight is used as the thermosetting resin, the epoxy group is replenished in the ink composition (inkjet ink), the reaction point concentration of the epoxy becomes high, and the crosslink density can be increased. can.

Among the polyfunctional epoxy resins, it is preferable to use an epoxy resin having four or more epoxy groups in one molecule (polyfunctional epoxy resin having four or more functional groups) from the viewpoint of increasing the crosslink density. In particular, when a thermosetting resin having a weight average molecular weight of 10,000 or less is used in order to improve the ejection stability from the ejection head in the inkjet method, the strength and hardness of the pixel portion (cured product of the ink composition) are lowered. From the viewpoint of sufficiently increasing the crosslink density, it is preferable to add a polyfunctional epoxy resin having four or more functionalities to the ink composition (inkjet ink).

As a thermosetting resin having an epoxy group, a multi-dimensional copolymer of a monomer having an oxylan ring structure and another monomer is less colored and has excellent transparency, has an increased crosslink density, and is excellent in chemical resistance and flexibility. It is preferable to other polyfunctional epoxy resins from the viewpoint that a cured product having the above-mentioned advantages can be easily obtained. Such excellent optical properties and film physical characteristics as a cured product indicate that it is suitable for, for example, applications in optical materials, particularly in an optical conversion layer where long-term reliability is expected.

As the curing agent and curing accelerator used for curing the thermosetting resin, any known and commonly used agent that can be dissolved or dispersed in the above-mentioned organic solvent can be used, and for example, 4-methylhexahydro can be used. Phenylacid anhydride, triethylenetetramine, diaminodiphenylmethane, phenol novolac resin, tris (dimethylaminomethyl) phenol, N, N-dimethylbenzylamine, 2-ethyl-4-methylimidazole, triphenylphosphine, 3-phenyl-1 , 1-dimethylurea and the like.

In particular, compared to polymers such as phenol novolac resin, it is liquid at room temperature or has excellent solubility in the above-mentioned organic solvent and can have a low viscosity, and can be easily cured at a lower temperature and in a shorter time. Therefore, it is preferable to use a low-molecular-weight curing agent and a curing accelerator, which are less colored in the cured product.

The thermosetting resin may be alkali-insoluble from the viewpoint that a color filter pixel portion having excellent reliability can be easily obtained. When the thermosetting resin is alkali-insoluble, the amount of the thermosetting resin dissolved at 25 ° C. in a 1% by mass potassium hydroxide aqueous solution is 30% by mass or less based on the total mass of the thermosetting resin. Means that. The dissolved amount of the thermosetting resin is preferably 10% by mass or less, and more preferably 3% by mass or less.

The weight average molecular weight of the thermosetting resin is from the viewpoint that an appropriate viscosity can be easily obtained as an inkjet ink, from the viewpoint of improving the curability of the ink composition, and the solvent resistance of the pixel portion (cured product of the ink composition). And from the viewpoint of improving the wear resistance, it may be 750 or more, 1000 or more, or 2000 or more. From the viewpoint of obtaining an appropriate viscosity as an inkjet ink, it may be 500,000 or less, 300,000 or less, or 200,000 or less. However, this does not apply to the molecular weight after cross-linking.

The content of the thermosetting resin is from the viewpoint that an appropriate viscosity can be easily obtained as an inkjet ink, from the viewpoint of improving the curability of the ink composition, and the solvent resistance of the pixel portion (cured product of the ink composition). From the viewpoint of improving the wear resistance, it may be 10% by mass or more, 15% by mass or more, or 20% by mass or more based on the mass of the non-volatile content of the ink composition. The content of the thermosetting resin is based on the mass of the non-volatile content of the ink composition from the viewpoint that the viscosity of the inkjet ink does not become too high and the thickness of the pixel portion does not become too thick for the light conversion function. It may be 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, or 50% by mass or less.

[Organic solvent]
The organic solvent in the present invention is an organic solvent in the specific LogP value range described later.

Examples of the organic solvent contained in the ink composition in the present invention include ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol dibutyl ether, diethyl adipate, dibutyl oxalate, and dimethyl malonate. , Diethyl malonate, dimethyl succinate, diethyl succinate, all-diacetate at 1,4-butane, glyceryltriacetate and the like.

The boiling point of the organic solvent is preferably 180 ° C. or higher from the viewpoint of continuous ejection stability of the inkjet ink. Further, since it is necessary to remove the solvent from the ink composition before curing the ink composition at the time of forming the pixel portion, the boiling point of the solvent is preferably 300 ° C. or lower from the viewpoint of easy removal of the solvent.

In the present invention, an organic solvent is used from the viewpoint of preparing the ink composition to be uniform and from the viewpoint of increasing the fluidity of the ink composition to form a color filter pixel portion (light conversion layer) with less unevenness. It is preferable to use.

[LogP value]
The greatest feature of the ink composition in the present invention is that an organic solvent in a specific LogP value range is used. For example, an organic solvent in the specific LogP value range is selected from the organic solvents exemplified above. Can be used as an essential ingredient. By using such an organic solvent in a specific LogP value range, in the present invention, the cured product of the ink composition can be made less likely to cause defects. In the present invention, the logP value represents the logarithmic value of the partition coefficient of 1-octanol / water of an organic solvent, "Journal of Pharmaceutical Sciences, p. 83, Vol. 84, No. 1, 1995" (WILLIAM M. MEYLAN, et al. Calculated by the method described in PHILIP H. HOWARD). The logP value is a numerical value generally used for the relative evaluation of the affinity hydrophobicity of an organic compound.

For example, it is required as follows.
1,4-Butanediol diacetate 1.39
Tetralin 3.27
LDO 1.35
OXT-221 2.02
Ethylene glycol -1.61
n-lauryl methacrylate 6.68

The logarithmic value of the 1-octanol / water partition coefficient can be actually measured based on JIS Z 7260-117, but the values obtained by the above calculation method have a very good correlation with many actual measurement results. It is shown in the above literature to show.

In the ink composition of the present invention, especially in the ink composition for inkjet, the LogP value of the organic solvent is −1.0 or more and 6.5 or less, and if necessary, the technical effect of the present invention is not impaired. In the range, the LogP value may contain an organic solvent outside this range.

The LogP value of the organic solvent may be 5.0 or less, 4.0 or less, or 3.0 or less in terms of suppressing oxygen absorption of the ink composition containing luminescent nanocrystals. It may be 2.0 or less. Further, from the viewpoint of suppressing deterioration of the luminescent nanocrystals due to oxygen, it may be −0.5 or more, 0.0 or more, or 1.0 or more.

When the LogP value contains an organic solvent outside the range of -1.0 or more to 6.5 or less in the above range, the organic solvent suppresses deterioration of the luminescent nanocrystals due to oxygen or moisture in the atmosphere. It may be 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, or 2% by mass or less in the ink.

Since the ink composition of the present invention is a thermosetting ink composition using a thermosetting resin, for example, deterioration of luminescent nanocrystal particles due to photocuring can be suppressed.

The ink composition of the present embodiment can be applied as an ink used in a known and conventional method for producing a color filter, but without wasting materials such as luminescent nanocrystal particles and a solvent, which are relatively expensive. In that the color filter pixel part (optical conversion layer) can be formed only by using the required amount in the required place, it should be appropriately prepared and used so as to be more suitable for the inkjet method than for the photolithography method. preferable.

The viscosity of the ink composition may be, for example, 2 mPa · s or more, 5 mPa · s or more, or 7 mPa · s or more from the viewpoint of ejection stability during inkjet printing. The viscosity of the ink composition may be 20 mPa · s or less, 15 mPa · s or less, or 12 mPa · s or less. When the viscosity of the ink composition is 2 mPa · s or more, the meniscus shape of the ink composition at the tip of the ink ejection hole of the ejection head is stable, so that the ejection control of the ink composition (for example, the ejection amount and the ejection timing) Control) becomes easy. On the other hand, when the viscosity is 20 mPa · s or less, the ink composition can be smoothly ejected from the ink ejection holes. The viscosities of the ink composition are 2-20 mPa · s, 2-15 mPa · s, 2-12 mPa · s, 5-20 mPa · s, 5-15 mPa · 2-20 mPa · s, 7-15 mPa · s, 7-12 mPa. It may be s, s, or 7 to 12 mPa · s. The viscosity of the ink composition is measured, for example, by an E-type viscometer.

The surface tension of the ink composition is preferably a surface tension suitable for the inkjet method, specifically, preferably in the range of 20 to 40 mN / m, and more preferably 25 to 35 mN / m. .. By setting the surface tension within this range, the occurrence of flight bending can be suppressed. The flight bending means that when the ink composition is ejected from the ink ejection holes, the landing position of the ink composition deviates from the target position by 30 μm or more. When the surface tension is 40 mN / m or less, the meniscus shape at the tip of the ink ejection hole is stable, so that ejection control of the ink composition (for example, control of ejection amount and ejection timing) becomes easy. On the other hand, when the surface tension is 20 mN / m or less, the occurrence of flight bending can be suppressed. That is, a pixel portion may not be landed accurately on the pixel portion forming region to be landed, and the ink composition may be insufficiently filled, or a pixel portion forming region (or pixel portion) adjacent to the pixel portion forming region to be landed may be generated. The ink composition does not land on the surface and the color reproducibility does not deteriorate.

The ink composition further contains light-emitting nanocrystal particles, light-scattering particles, a thermosetting resin, a polymer dispersant, and other components other than the organic ligand, as long as the effects of the present invention are not impaired. May be good. Examples of other components include photopolymerizable compounds, polymerization initiators, sensitizers and the like.

[Dissolved oxygen concentration]
In the present invention, it is required to set the dissolved oxygen concentration of the ink composition at a temperature of 23 ° C. in a specific range based on the Japanese Industrial Standards JIS K0102.

The dissolved oxygen concentration is a value measured by measuring the dissolved oxygen of the ink composition using an optical and solvent-resistant dissolved oxygen concentration meter. Specifically, for example, Hamilton's Visiferm is used to prepare the ink composition. Dissolved oxygen concentration can be measured. It is possible to reduce the dissolved oxygen concentration from the measurable lower limit of the device for measuring the dissolved oxygen concentration, which is also an embodiment of the present invention.

In the present invention, the dissolved oxygen concentration of the ink composition at a temperature of 23 ° C. based on Japanese Industrial Standards JIS K0102 is set to 6 mg / L in excess of 0, so that the luminescent nano is not limited to the method of applying the ink. Although deterioration of crystal particles can be prevented, better technical effects as described above can be expected when the application method is for inkjet. Above all, the dissolved oxygen concentration at a temperature of 23 ° C. based on the Japanese Industrial Standard JIS K0102 is preferably more than 0 to 1 mg / L, more preferably more than 0 to 0.4 mg / L, and 0. It is more preferably more than 0.04 mg / L, and more than 0 and 0.004 mg / L, the most excellent technical effect can be expected.

Since oxygen dissolves in a liquid in the atmosphere, the ink composition may be prepared after deoxidizing each of the ink composition raw materials, or the ink composition may be prepared without deoxidizing the ink composition raw materials. , The ink composition may be deoxidized. After deoxidizing each of the ink composition raw materials to prepare an ink composition, the ink composition may be further deoxidized. By performing the deoxidizing operation more strictly, it becomes difficult for the cured product to cause defects, and deterioration of the luminescent nanocrystals can be suppressed more reliably.

In one embodiment, the dissolved oxygen concentration of the ink composition or the raw material of the ink composition such as the thermosetting resin can be reduced by removing the dissolved oxygen gas from the ink composition or the thermosetting resin, but for example. , The ink composition and the thermosetting resin can be reduced by exposing them to an inert gas stream such as nitrogen or argon, or by blowing an inert gas. As the inert gas on the left, selecting and using a gas that does not dissolve in the ink composition, a thermosetting resin or other ink composition raw material, or a gas that has as little solubility as possible not only prevents deterioration of the quantum dots themselves, but also prevents deterioration of the quantum dots themselves. It is preferable because it is possible to suppress the generation of air bubbles during liquid feeding and in the IJ head, and it is possible to obtain highly reliable CF for a long period of time. For solid raw materials such as light-scattering particles, for example, by filling the inside of the container with a nitrogen stream and storing it in a nitrogen atmosphere, it is possible to suppress the mixing of oxygen into the ink composition.

The deoxidizing treatment time is not particularly limited, but for example, the inert gas may be aerated through the ink composition so as to have an arbitrary volume per unit time, for example, the ink composition. It may be deoxidized for 1 minute or more, deoxidized for 15 minutes or more, or deoxidized for 30 hours or more at 1 to 100 ml / min per 100 ml. At this time, the deoxidizing treatment may be performed in an atmospheric atmosphere, but it is preferable to perform the deoxidizing treatment in an inert gas atmosphere in which oxygen is substantially not present. The temperature of the deoxidizing treatment may be 5 ° C. or higher, 20 ° C. or higher, 30 ° C. or higher, and 50 ° C. or higher. Depressurization during heating is also preferable from the viewpoint of removing oxygen gas, and may be 0.1 mmHg or less, 0.01 mmHg, or 0.001 mmHg or less.

Since solid raw materials such as light-scattering particles can adsorb oxygen molecules in the atmosphere, they may be deoxidized before use, and heated in the atmosphere, in an inert gas atmosphere, or under reduced pressure to remove oxygen. It's okay.

[Oxygen scavenger]
In an embodiment different from the above, an oxygen scavenger is contained in the ink composition. The ink composition of one embodiment may contain an oxygen scavenger, and the oxygen scavenger may be one that reacts with dissolved oxygen to reduce the oxygen concentration, for example, L-ascorbic acid, erythorbic acid, gallic acid, and gallic acid. Examples thereof include these salts, pyrogallol, gallacetophenone and the like.

Further, in the present invention, the content of the oxygen scavenger in the ink composition may be 0.01% by mass or more, and 0.1% by mass or more, from the viewpoint of suppressing deterioration of luminescent nanocrystals. It may be 0.5% by mass or more, 1% by mass or more, and may be 30% by mass or less and 20% by mass or less from the viewpoint of avoiding coloring of the ink curing film. It may be 10% by mass or less, and may be 5% by mass or less.

Since the method of removing the dissolved oxygen from the ink composition is simpler, a method of introducing an inert gas such as nitrogen gas into the ink composition to remove the dissolved gas containing the dissolved oxygen, or an ink composition. It is preferable to adopt a method of depressurizing an object.

By combining the method of removing the dissolved gas containing dissolved oxygen in the above-mentioned ink composition and the method of dehydrating the ink composition, both the dissolved gas concentration and the water concentration are low in the ink composition. It is more preferable from the viewpoint that it can be prepared and the defects of the cured product and the deterioration of the luminescent nanocrystals can be more effectively suppressed.

Although one embodiment of the ink composition for a color filter has been described above, the ink composition of the above-described embodiment can be used, for example, by a photolithography method in addition to the inkjet method. In this case, the ink composition contains an alkali-soluble resin as the binder polymer.

When the ink composition is used in a photography method, the ink composition is first applied onto a substrate, and when the ink composition contains a solvent, the ink composition is further dried to form a coating film. The coating film thus obtained is soluble in an alkaline developer and is patterned by being treated with an alkaline developer. At this time, since the alkaline developer is mostly an aqueous solution from the viewpoint of ease of waste liquid treatment of the developer, the coating film of the ink composition is treated with the aqueous solution. On the other hand, in the case of an ink composition using luminescent nanocrystal particles (quantum dots or the like), the luminescent nanocrystal particles are unstable with respect to water, and the luminescence (for example, fluorescence) is impaired by water. Therefore, in this embodiment, an inkjet method that does not need to be treated with an alkaline developer (aqueous solution) is preferable.

Further, even when the coating film of the ink composition is not treated with an alkaline developer, when the ink composition is alkali-soluble, the coating film of the ink composition easily absorbs moisture in the atmosphere, and the time is long. As time passes, the luminescence (for example, fluorescence) of the luminescent nanocrystal particles (quantum dots, etc.) is impaired. From this point of view, in the present embodiment, the coating film of the ink composition is preferably alkali-insoluble. That is, the ink composition of the present embodiment is preferably an ink composition capable of forming an alkali-insoluble coating film. Such an ink composition can be obtained by using an alkali-insoluble photopolymerizable compound as the photopolymerizable compound. The fact that the coating film of the ink composition is alkaline insoluble means that the amount of the coating film of the ink composition dissolved at 25 ° C. in a 1% by mass potassium hydroxide aqueous solution is based on the total mass of the coating film of the ink composition. It means that it is 30% by mass or less. The dissolved amount of the coating film of the ink composition is preferably 10% by mass or less, and more preferably 3% by mass or less. The fact that the ink composition is an ink composition capable of forming an alkali-insoluble coating film means that after the ink composition is applied onto the substrate, it is dried at 80 ° C. for 3 minutes when it contains a solvent. It can be confirmed by measuring the above-mentioned dissolution amount of the obtained coating film having a thickness of 1 μm.

<Manufacturing method of ink composition>
Next, a method for producing the ink composition of the above-described embodiment will be described. The method for producing the ink composition includes, for example, a first step of preparing a dispersion of light-scattering particles containing a light-scattering particle and a polymer dispersant, and a dispersion of light-scattering particles and a luminescent nano. It comprises a second step of mixing the crystal particles. In this method, the dispersion of the light-scattering particles may further contain a thermosetting resin, and the thermosetting resin may be further mixed in the second step. According to this method, the light scattering particles can be sufficiently dispersed. Therefore, it is possible to easily obtain an ink composition capable of reducing leakage light in the pixel portion.

In the step of preparing a dispersion of light-scattering particles, a dispersion of light-scattering particles is obtained by mixing a light-scattering particle, a polymer dispersant, and, in some cases, a thermosetting resin, and performing a dispersion treatment. May be prepared. The mixing and dispersion treatment may be performed using a dispersion device such as a bead mill, a paint conditioner, or a planetary stirrer. It is preferable to use a bead mill or a paint conditioner from the viewpoint that the dispersibility of the light-scattering particles is good and the average particle size of the light-scattering particles can be easily adjusted to a desired range.

Even if the method for producing an ink composition further includes a step of preparing a dispersion of luminescent nanocrystal particles containing the luminescent nanocrystal particles and a thermosetting resin before the second step. good. In this case, in the second step, the dispersion of the light-scattering particles and the dispersion of the luminescent nanocrystal particles are mixed. According to this method, the luminescent nanocrystal particles can be sufficiently dispersed. Therefore, it is possible to easily obtain an ink composition capable of reducing leakage light in the pixel portion. In the step of preparing the dispersion of the luminescent nanocrystal particles, the luminescent nanocrystal particles are mixed and dispersed with the thermosetting resin by using the same dispersion device as in the step of preparing the dispersion of the light scattering particles. Processing may be performed.

The ink composition thus obtained is prepared as described above so as to have a specific dissolved oxygen concentration.

When the ink composition of the present embodiment is used as an ink composition for an inkjet method, it is preferably applied to a piezojet type inkjet recording device having a mechanical ejection mechanism using a piezoelectric element. In the piezojet method, the ink composition is not instantaneously exposed to a high temperature during ejection, deterioration of the luminescent nanocrystal particles is unlikely to occur, and the color filter pixel portion (light conversion layer) has the expected emission characteristics. Is easier to obtain.

<Optical conversion layer and color filter>
Next, the details of the light conversion layer and the color filter using the ink composition of the above-described embodiment will be described with reference to the drawings. In the following description, the same reference numerals will be used for the same or equivalent elements, and duplicate description will be omitted.

FIG. 1 is a schematic cross-sectional view of the color filter of one embodiment. As shown in FIG. 1, the color filter 100 includes a base material 40 and a light conversion layer 30 provided on the base material 40. The light conversion layer 30 includes a plurality of pixel units 10 and a light-shielding unit 20.

The optical conversion layer 30 has a first pixel unit 10a, a second pixel unit 10b, and a third pixel unit 10c as the pixel unit 10. The first pixel portion 10a, the second pixel portion 10b, and the third pixel portion 10c are arranged in a grid pattern so as to repeat in this order. The light-shielding portion 20 is located between adjacent pixel portions, that is, between the first pixel portion 10a and the second pixel portion 10b, between the second pixel portion 10b and the third pixel portion 10c, and the third. It is provided between the pixel portion 10c of the above and the first pixel portion 10a. In other words, these adjacent pixel portions are separated from each other by the light-shielding portion 20.

The first pixel portion 10a and the second pixel portion 10b each include a cured product of the ink composition of the above-described embodiment. The cured product contains luminescent nanocrystal particles, light-scattering particles, and a cured component. The curing component is a cured product of a thermosetting resin, and specifically, a cured product obtained by crosslinking the thermosetting resin. That is, the first pixel portion 10a contains the first curing component 13a and the first luminescent nanocrystal particles 11a and the first light scattering particles 12a dispersed in the first curing component 13a, respectively. include. Similarly, the second pixel portion 10b includes the second curing component 13b and the second luminescent nanocrystal particles 11b and the second light scattering particles 12b dispersed in the second curing component 13b, respectively. including. In the first pixel portion 10a and the second pixel portion 10b, the first curing component 13a and the second curing component 13b may be the same or different, and may be the same as or different from the first light scattering particles 12a. It may be the same as or different from the second light-scattering particle 12b.

The first luminescent nanocrystal particles 11a are red luminescent nanocrystal particles that absorb light having a wavelength in the range of 420 to 480 nm and emit light having a emission peak wavelength in the range of 605 to 665 nm. That is, the first pixel portion 10a may be paraphrased as a red pixel portion for converting blue light into red light. The second luminescent nanocrystal particle 11b is a green luminescent nanocrystal particle that absorbs light having a wavelength in the range of 420 to 480 nm and emits light having a emission peak wavelength in the range of 500 to 560 nm. That is, the second pixel portion 10b may be paraphrased as a green pixel portion for converting blue light into green light.

The content of the luminescent nanocrystal particles in the pixel portion containing the cured product of the ink composition is 5% by mass or more based on the total mass of the cured product of the ink composition from the viewpoint of being more excellent in the effect of reducing leakage light. It may be 10% by mass or more, 15% by mass or more, 20% by mass or more, 30% by mass or more, or 40% by mass or more. May be good. The content of the luminescent nanocrystal particles may be 70% by mass or less, or 60% by mass or less, based on the total mass of the cured product of the ink composition from the viewpoint of excellent reliability of the pixel portion. It may be 55% by mass or less, or 50% by mass or less.

The content of the light-scattering particles in the pixel portion containing the cured product of the ink composition is 0.1% by mass or more based on the total mass of the cured product of the ink composition from the viewpoint of being more excellent in the effect of reducing leakage light. It may be 1% by mass or more, 5% by mass or more, 7% by mass or more, 10% by mass or more, or 12% by mass or more. You may. The content of the light-scattering particles may be 60% by mass or less based on the total mass of the cured product of the ink composition from the viewpoint of excellent effect of reducing leakage light and excellent reliability of the pixel portion. It may be 50% by mass or less, 40% by mass or less, 30% by mass or less, 25% by mass or less, or 20% by mass or less. It may be 15% by mass or less. The content of the light-scattering particles is 0.1 to 60% by mass, 0.1 to 50% by mass, 0.1 to 40% by mass, 0.1 to 1 based on the total mass of the cured product of the ink composition. 30% by mass, 0.1 to 25% by mass, 0.1 to 20% by mass, 0.1 to 15% by mass, 1 to 60% by mass, 1 to 50% by mass, 1 to 40% by mass, 1 to 30% by mass. %, 1-25% by mass, 1-20% by mass, 1-15% by mass, 5-60% by mass, 5-50% by mass, 5-40% by mass, 5-30% by mass, 5-25% by mass, 5 to 20% by mass, 5 to 15% by mass, 7 to 60% by mass, 7 to 50% by mass, 7 to 40% by mass, 7 to 30% by mass, 7 to 25% by mass, 7 to 20% by mass, 7 to 15% by mass, 10-60% by mass, 10-50% by mass, 10-40% by mass, 10-30% by mass, 10-25% by mass, 10-20% by mass, 10-15% by mass, 12-60% by mass %, 12-50% by mass, 12-40% by mass, 12-30% by mass, 12-25% by mass, 12-20% by mass, or 12-15% by mass.

The third pixel portion 10c has a transmittance of 30% or more with respect to light having a wavelength in the range of 420 to 480 nm. Therefore, the third pixel unit 10c functions as a blue pixel unit when a light source that emits light having a wavelength in the range of 420 to 480 nm is used. The third pixel portion 10c contains, for example, a cured product of the composition containing the thermosetting resin described above. The cured product contains a third cured component 13c. The third curing component 13c is a cured product of a thermosetting resin, and specifically, is a cured product obtained by crosslinking the thermosetting resin. That is, the third pixel portion 10c contains the third curing component 13c. When the third pixel portion 10c contains the above-mentioned cured product, the composition containing the thermosetting resin has the above-mentioned ink as long as the transmittance for light having a wavelength in the range of 420 to 480 nm is 30% or more. Among the components contained in the composition, components other than the thermosetting resin may be further contained. The transmittance of the third pixel unit 10c can be measured by a microspectroscopy device.

The thickness of the pixel portion (first pixel portion 10a, second pixel portion 10b, and third pixel portion 10c) may be, for example, 1 μm or more, 2 μm or more, or 3 μm or more. You may. The thickness of the pixel portion (first pixel portion 10a, second pixel portion 10b, and third pixel portion 10c) may be, for example, 30 μm or less, 20 μm or less, or 15 μm or less. You may.

The light-shielding portion 20 is a so-called black matrix provided for the purpose of separating adjacent pixel portions to prevent color mixing and for the purpose of preventing light leakage from a light source. The material constituting the light-shielding portion 20 is not particularly limited, and the curing of the resin composition in which the binder polymer contains light-shielding particles such as carbon fine particles, metal oxides, inorganic pigments, and organic pigments in addition to a metal such as chromium. Objects and the like can be used. The binder polymer used here includes one or a mixture of two or more resins such as polyimide resin, acrylic resin, epoxy resin, polyacrylamide, polyvinyl alcohol, gelatin, casein, and cellulose, photosensitive resin, and O / W. An emulsion-type resin composition (for example, an emulsion of reactive silicone) or the like can be used. The thickness of the light-shielding portion 20 may be, for example, 0.5 μm or more, and may be 10 μm or less.

The base material 40 is a transparent base material having light transmission, and is, for example, a transparent glass substrate such as quartz glass, Pylex (registered trademark) glass, a synthetic quartz plate, a transparent resin film, an optical resin film, or the like. A flexible base material or the like can be used. Among these, it is preferable to use a glass substrate made of non-alkali glass that does not contain an alkaline component in the glass. Specifically, "7059 glass", "1737 glass", "Eagle 200" and "Eagle XG" manufactured by Corning Inc., "AN100" manufactured by Asahi Glass Co., Ltd., "OA-10G" and "OA-10G" manufactured by Nippon Electric Glass Co., Ltd. OA-11 "is suitable. These are materials with a small coefficient of thermal expansion and are excellent in dimensional stability and workability in high temperature heat treatment.

The color filter 100 provided with the above optical conversion layer 30 is suitably used when a light source that emits light having a wavelength in the range of 420 to 480 nm is used.

In the color filter 100, for example, after the light-shielding portion 20 is formed in a pattern on the base material 40, the ink composition of the above-described embodiment is formed in the pixel portion-forming region partitioned by the light-shielding portion 20 on the base material 40. Inkjet ink) can be selectively adhered by an inkjet method, and the ink composition can be cured by irradiation with active energy rays or heating.

The method of forming the light-shielding portion 20 is to form a metal thin film such as chromium or a thin film of a resin composition containing light-shielding particles in a region serving as a boundary between a plurality of pixel portions on one surface side of the base material 40. However, a method of patterning this thin film and the like can be mentioned. The metal thin film can be formed by, for example, a sputtering method, a vacuum vapor deposition method, or the like, and the thin film of the resin composition containing the light-shielding particles can be formed, for example, by a method such as coating or printing. Examples of the method for patterning include a photolithography method and the like.

Examples of the inkjet method include a bubble jet (registered trademark) method using an electric heat converter as an energy generating element, a piezojet method using a piezoelectric element, and the like.

When the ink composition is cured by irradiation with active energy rays (for example, ultraviolet rays), for example, a mercury lamp, a metal halide lamp, a xenon lamp, an LED or the like may be used. The wavelength of the light to be irradiated may be, for example, 200 nm or more, and may be 440 nm or less. The exposure amount may be, for example, 10 mJ / cm ² or more, and may be 4000 mJ / cm ^{2 or less.}

When the ink composition is cured by heating, the heating temperature may be, for example, 110 ° C. or higher, and may be 250 ° C. or lower. The heating time may be, for example, 10 minutes or more, and may be 120 minutes or less.

Although the color filter, the optical conversion layer, and one embodiment of these manufacturing methods have been described above, the present invention is not limited to the above embodiment.

For example, the optical conversion layer is a pixel portion containing a cured product of an ink composition containing blue-emitting nanocrystal particles in place of the third pixel portion 10c or in addition to the third pixel portion 10c ( It may be provided with a blue pixel portion). Further, the light conversion layer may include a pixel portion (for example, a yellow pixel portion) containing a cured product of an ink composition containing nanocrystal particles that emit light of a color other than red, green, and blue. In these cases, it is preferable that each of the luminescent nanocrystal particles contained in each pixel portion of the optical conversion layer has an absorption maximum wavelength in the same wavelength range.

Further, at least a part of the pixel portion of the light conversion layer may contain a cured product of a composition containing a pigment other than the luminescent nanocrystal particles.

Further, the color filter may include an ink-repellent layer made of a material having an ink-repellent property narrower than that of the light-shielding portion on the pattern of the light-shielding portion. Further, instead of providing an ink-repellent layer, a photocatalyst-containing layer as a wettable variable layer is formed in a solid coating shape in a region including a pixel portion forming region, and then light is applied to the photocatalyst-containing layer via a photomask. Irradiation and exposure may be performed to selectively increase the parental ink property of the pixel portion forming region. Examples of the photocatalyst include titanium oxide.

Further, the color filter may be provided with an ink receiving layer containing hydroxypropyl cellulose or the like between the base material and the pixel portion.

Further, the color filter may be provided with a protective layer on the pixel portion. This protective layer flattens the color filter and prevents the components contained in the pixel portion, or the components contained in the pixel portion and the components contained in the photocatalyst-containing layer from elution into the liquid crystal layer. It is provided. As the material constituting the protective layer, a material used as a known protective layer for a color filter can be used.

Further, in the manufacture of the color filter and the optical conversion layer, the pixel portion may be formed by a photolithography method instead of the inkjet method. In this case, first, the ink composition is coated on the base material in a layered manner to form an ink composition layer. Next, the ink composition layer is exposed in a pattern and then developed using a developing solution. In this way, a pixel portion made of a cured product of the ink composition is formed. Since the developer is usually alkaline, an alkali-soluble polymer is used as the binder polymer. However, in terms of material usage efficiency, the inkjet method is superior to the photolithography method. This is because, in principle, the photolithography method removes about two-thirds or more of the material, and the material is wasted. Therefore, in the present embodiment, it is preferable to use an inkjet ink and form a pixel portion by an inkjet method.

Further, in addition to the above-mentioned luminescent nanocrystal particles, the pixel portion of the light conversion layer of the present embodiment may further contain a pigment having substantially the same color as the luminescent color of the luminescent nanocrystal particles. For example, when a pixel portion containing luminescent nanocrystal particles that absorb and emit blue light is used as the pixel portion of the liquid crystal display element, the light from the light source is blue light or semi-white light having a peak at 450 nm. However, if the concentration of the luminescent nanocrystal particles in the pixel portion is not sufficient, the light from the light source passes through the light conversion layer when the liquid crystal display element is driven. The transmitted light (blue light, leaked light) from this light source and the light emitted by the luminescent nanocrystal particles are mixed. From the viewpoint of preventing deterioration of color reproducibility due to the occurrence of such color mixing, a pigment may be contained in the pixel portion of the optical conversion layer. In order to contain the pigment in the pixel portion, the pigment may be contained in the ink composition.

Further, one or two of the red pixel portion (R), the green pixel portion (G), and the blue pixel portion (B) in the optical conversion layer of the present embodiment do not contain luminescent nanocrystal particles. It may be a pixel portion containing a coloring material. As the color material that can be used here, a known color material can be used. For example, as the color material used for the red pixel portion (R), a diketopyrrolopyrrole pigment and / or an anionic red organic dye is used. Can be mentioned. Examples of the coloring material used for the green pixel portion (G) include at least one selected from the group consisting of a halogenated copper phthalocyanine pigment, a phthalocyanine-based green dye, a phthalocyanine-based blue dye and an azo-based yellow organic dye. Examples of the coloring material used for the blue pixel portion (B) include an ε-type copper phthalosine pigment and / or a cationic blue organic dye. The amount of these coloring materials used is 1 to 5 mass based on the total mass of the pixel portion (cured product of the ink composition) from the viewpoint of preventing a decrease in transmittance when contained in the light conversion layer. % Is preferable.

Hereinafter, the present invention will be specifically described with reference to Examples. However, the present invention is not limited to the following examples.

The following operations for producing luminescent nanocrystals and ink were performed in a glove box filled with nitrogen or in a flask with the atmosphere blocked and a nitrogen stream.
In addition, all the raw materials exemplified below were used by introducing nitrogen gas into the container and replacing it with nitrogen gas in advance. As for the liquid material, nitrogen gas was introduced into the liquid to replace the dissolved oxygen with nitrogen gas.

Titanium oxide was heated at 120 ° C. for 2 hours under a reduced pressure of 1 mmHg and allowed to cool in a nitrogen gas atmosphere before use.

[Manufacturing of red luminescent nanocrystals]
17.48 g of indium acetate, 25.0 g of trioctylphosphine oxide, and 35.98 g of lauric acid were placed in a 1000 ml flask, and the mixture was stirred at 160 ° C. for 40 minutes while bubbling with nitrogen gas. After further stirring at 250 ° C. for 20 minutes, the mixture was heated to 300 ° C. and stirring was continued. 4.0 g of tris (trimethylsilyl) phosphine was dissolved in 15.0 g of trioctylphosphine in the glove box and then filled in a glass syringe. This was poured into a flask kept at 300 ° C. and reacted at 250 ° C. for 10 minutes. Further, in the glove box, 5 ml of a mixed solution prepared by dissolving 7.5 g of tris (trimethylsilyl) phosphine in 30.0 g of trioctylphosphine was added dropwise to the above reaction solution in 12 minutes, and then 5 ml of each reaction solution was added at 15-minute intervals until it was used up. Added to.

Indium acetate (5.595 g), trioctylphosphine oxide (10.0 g), and lauric acid (11.515 g) were charged in another three-necked flask, and the mixture was stirred at 160 ° C. for 40 minutes while bubbling with nitrogen gas. Further, the mixture was stirred at 250 ° C. for 20 minutes, heated to 300 ° C., and then cooled to 70 ° C., and a mixed solution was added to the reaction solution. In the glove box, 5 ml of a mixed solution prepared by dissolving 4.0 g of tris (trimethylsilyl) phosphine in 15.0 g of trioctylphosphine was added dropwise to the above reaction solution again in 12 minutes, and then the reaction was carried out at intervals of 5 ml at intervals of 15 minutes until it was used up. Added to solution. After maintaining stirring for 1 hour and cooling to room temperature, 100 ml of toluene and 400 ml of ethanol were added to aggregate the fine particles. After precipitating the fine particles using a centrifuge, the supernatant was discarded, and the precipitated fine particles were dissolved in trioctylphosphine to obtain a trioctylphosphine solution of indium phosphide (InP) red luminescent nanocrystals. ..

[Manufacturing of green luminescent nanocrystals]
23.3 g of indium acetate, 40.0 g of trioctylphosphine oxide, and 48.0 g of lauric acid were placed in a 1000 ml flask, and the mixture was stirred at 160 ° C. for 40 minutes while bubbling with nitrogen gas. After further stirring at 250 ° C. for 20 minutes, the mixture was heated to 300 ° C. and stirring was continued. After dissolving 10.0 g of tris (trimethylsilyl) phosphine in 30.0 g of trioctylphosphine in the glove box, it was filled in a glass syringe. This was poured into a flask kept at 300 ° C. and reacted at 250 ° C. for 5 minutes. The flask was cooled to room temperature, and 100 ml of toluene and 400 ml of ethanol were added to aggregate the fine particles. After precipitating the fine particles using a centrifuge, the supernatant was discarded, and the precipitated fine particles were dissolved in trioctylphosphine to obtain a trioctylphosphine solution of indium phosphide (InP) green luminescent nanocrystals. ..

[Manufacturing of InP / ZnS core-shell nanocrystals]
After adjusting to 3.6 g of InP and 90 g of trioctylphosphine in the trioctylphosphine solution of the InP nanocrystals synthesized above, the mixture is placed in a 1000 ml flask, and 90 g of trioctylphosphine oxide and 30 g of lauric acid are further added. On the other hand, a stock solution is prepared by mixing 42.9 ml of a 1 M hexane solution of diethylzinc and 92.49 g of a trioctylphosphine 9.09 wt% solution of bistrimethylsilylsulfide in a glove box with 162 g of trioctylphosphine. After replacing the inside of the flask with a nitrogen atmosphere, the temperature of the flask is set to 180 ° C., and when the temperature reaches 80 ° C., 15 ml of the above stock solution is added, and then 15 ml is continuously added every 10 minutes. (Flask temperature maintained at 180 ° C). After the final addition was completed, the reaction was terminated by maintaining the temperature for another 10 minutes. After completion of the reaction, the solution was cooled to room temperature, and 500 ml of toluene and 2000 ml of ethanol were added to aggregate the nanocrystals. After precipitating the nanocrystals using a centrifuge, discard the supernatant and dissolve the precipitate in chloroform again so that the nanocrystal concentration in the solution is 20% by mass. Chloroform solution was obtained.

[QD ligand exchange]
Triethylene glycol monomethyl ether ester (triethylene glycol monomethyl ether mercaptopropionate) (TEGMEMP) of 3-mercaptopropanoic acid was synthesized with reference to JP-A-2002-121549 (public patent gazette of Mitsubishi Chemical Corporation).

In a container filled with nitrogen gas, QD dispersion 1 (the above-mentioned InP / ZnS core-shell nanocrystals (red luminescent)) and 80 g of a chloroform solution in which 8 g of the above-synthesized TEGMEMP are dissolved are mixed and mixed at 80 ° C. for 2 hours. The ligand was exchanged by stirring, and the mixture was cooled to room temperature.

Then, toluene / chloroform was evaporated with stirring at 40 ° C. under reduced pressure, and the mixture was concentrated until the liquid volume reached 100 ml. Four times the weight of n-hexane was added to this dispersion to aggregate the QD, and the supernatant was removed by centrifugation and decantation. 50 g of toluene was added to the precipitate and the mixture was redispersed by ultrasonic waves. This washing operation was performed a total of three times to remove the free ligand component remaining in the liquid. The decanted precipitate was vacuum dried at room temperature for 2 hours to obtain 2 g of TEGMEMP-modified QD (QD-TEGMEMP) powder.

[Preparation of titanium oxide dispersion]
In a container filled with nitrogen gas, 6 g of titanium oxide, 1.01 g of a polymer dispersant, and 1,4-butanediol diacetate were mixed so as to have a non-volatile content of 40%. After adding zirconia beads (diameter: 1.25 mm) to the formulation in the container filled with nitrogen gas, the closed container filled with nitrogen gas is shaken for 2 hours using a paint conditioner to disperse the formulation. Was done. As a result, a light-scattering particle dispersion 1 was obtained.
All of the above materials used were those in which nitrogen gas was introduced and the dissolved oxygen was replaced with nitrogen gas.

[Example 1]
[Preparation of ink composition]
After uniformly mixing the following (1), (2) and (3) in a container filled with nitrogen gas, the mixture is filtered through a filter having a pore size of 5 μm in a glove box, and nitrogen gas is further put into ink. It was introduced and the nitrogen gas was saturated.

Then, the pressure was reduced to remove the nitrogen gas, whereby an ink composition was obtained. To 10 ml of the deoxidized ink composition thus obtained, Kanto Kagaku Co., Ltd. Molecular Sheave 3A was added at a ratio of 1 g, dehydrated under a nitrogen atmosphere for 48 hours, and with a filter having a pore size of 5 μm. The molecular sheave was removed to give the final ink composition. The materials used are as follows.

[Light scattering particles]
-Titanium oxide: MPT141 (manufactured by Ishihara Sangyo Co., Ltd.)
[Thermosetting resin]
-Solid acrylic resin containing glycidyl group: "Findick A-254"
(Manufactured by DIC Corporation, epoxy equivalent 500)
[Polymer dispersant]
-Polymer dispersant: BYK-2164
(Product name "DISPERBYK" manufactured by BYK is a registered trademark)
[Organic solvent]
・ 1,4-Butanediol diacetate (manufactured by Daicel Corporation)

(1) 22.5 g of a QD dispersion liquid prepared by mixing the organic solvent 1,4-butanediol diacetate with the QD-TEGMEMP prepared above to have a non-volatile content of 30%.
(2) Thermosetting resin: "Findick A-254" (6.28 g) manufactured by DIC Co., Ltd., and curing agent: 1-methylcyclohexane-4,5-dicarboxylic acid anhydride (1.05 g). Accelerator: Dimethylbenzylamine (0.08 g) dissolved in an organic solvent: 1,4-butanediol diacetate so as to have a non-volatile content of 30%, 12.5 g of a thermosetting resin solution.
(3) The light-scattering particle dispersion 1 7.5 g

Titanium oxide was heated at 120 ° C. for 2 hours under a reduced pressure of 1 mmHg and allowed to cool in a nitrogen gas atmosphere before mixing.

[Example 2]
[Preparation of ink composition]
Instead of the QD dispersion liquid 1, the QD dispersion liquid 2 (the above-mentioned InP / ZnS core-shell nanocrystal (green light emitting)) was used, and an ink composition was obtained in the same manner as in Example 1.

[Comparative Example 1]
An ink composition sealed in nitrogen gas, which was prepared in the same manner as in Example 1 using decylbenzene as an organic solvent, was stirred in the atmosphere to obtain an ink composition. An increase in the dissolved oxygen concentration was observed.

[Making an optical conversion filter]
The ink composition obtained above was applied onto a glass substrate in the atmosphere with a spin coater so that the film thickness after drying was 3.5 μm. The coating film was heated to 180 ° C. in nitrogen and cured to form a layer (light conversion layer) made of a cured product of the ink composition on a glass substrate. An optical conversion filter was obtained by the above operation.

(3) Evaluation Using the ink composition obtained above and the light conversion filter obtained above, evaluation was performed by the following procedure. The results are shown in Table 1.

[External Quantum Efficiency (EQE)]
Using the blue LED (peak emission wavelength: 450 nm), connect an integrating sphere to the radiation spectrophotometer (trade name "MCPD-9800") manufactured by Otsuka Electronics Co., Ltd., and connect the integrating sphere to the upper side of the blue LED. Was installed. A substrate having an optical conversion layer was inserted between the blue LED and the integrating sphere, and the spectrum observed by turning on the blue LED and the illuminance at each wavelength were measured.

From the spectrum measured by the above measuring device and the illuminance, the external quantum efficiency was obtained as follows. This value is a value indicating how much of the light (photons) incident on the photoconversion layer is emitted to the observer side as fluorescence. Therefore, if this value is large, it indicates that the optical conversion layer is excellent, and it is an important evaluation index.

External quantum efficiency of red emission light conversion layer = P (Red) / E (Blue) × 100 (%)
External quantum efficiency of green emission light conversion layer = P (Green) / E (Blue) x 100 (%)

Here, E (Blue), P (Red), and P (Green) represent the following, respectively.
E (Blue):
It represents the total value of "illuminance x wavelength ÷ hc" in the wavelength range of 380 to 490 nm in this wavelength range. In addition, h represents Planck's constant and c represents the speed of light. (This is a value corresponding to the number of observed photons.)
P (Red):
It represents the total value in this wavelength range of "illuminance x wavelength ÷ hc" at the measurement wavelength of 490 to 590 nm. (Corresponds to the number of observed photons)
P (Green):
It represents the total value of "illuminance x wavelength ÷ hc" in the measurement wavelength of 590 to 780 nm in this wavelength range. (Corresponds to the number of observed photons)

Based on the above, the EQE was calculated, the EQE of Example 2 was set to 10, and the EQE of the measured sample was evaluated as a relative value as follows.
<Evaluation criteria>
Less than 10: D
10: C
More than 10 and less than 100: B
Over 100: A

[Bubble evaluation]
The above ink was sent using a liquid feeding pump, and the generation of air bubbles in the piping tube was visually observed.
[Dissolved oxygen concentration evaluation]
An optical and solvent-resistant Hamilton Visiferm was used as the dissolved oxygen concentration meter, and the dissolved oxygen concentration of the ink composition was measured.

[Example 3]
First, a substrate (BM substrate) having a light-shielding portion called a black matrix (BM) was produced by the following procedure. That is, after applying black resist (“CFPR BK” manufactured by Tokyo Ohka Kogyo Co., Ltd.) on a glass substrate made of non-alkali glass (“OA-10G” manufactured by Nippon Electric Glass Co., Ltd.), prebaking, pattern exposure, development and By performing post-baking, a patterned light-shielding portion was formed. The exposure was performed by irradiating the black resist with ultraviolet rays at an exposure amount of 250 mJ / cm2. The pattern of the light-shielding portion was a pattern having an opening portion corresponding to a sub-pixel of 200 μm × 600 μm, the line width was 20 μm, and the thickness was 2.6 μm.

Next, the red light emitting ink composition obtained in Example 1 was printed on the opening portion on the BM substrate by an inkjet method, then irradiated with ultraviolet rays, and then heated at 150 ° C. for 30 minutes under a nitrogen atmosphere. As a result, the ink composition was cured to form a pixel portion made of the cured product of the ink composition. The obtained pixel portion is a pixel portion that converts blue light into red light. The thickness of the pixel portion was 2.1 μm. By the above operation, a patterned optical conversion filter was obtained.

[Example 4]
A BM substrate was prepared in the same manner as in Example 3. Next, the red light emitting ink composition obtained in Example 1 and the green light emitting ink composition obtained in Example 2 were printed on the opening portion on the BM substrate by an inkjet method, and then irradiated with ultraviolet rays to give Example 3. The ink composition was cured in the same manner as in the above. As a result, a pixel portion that converts blue light into red light and a pixel portion that converts blue light into green light are formed on the BM substrate. By the above operation, a patterned optical conversion filter having a plurality of types of pixel portions was obtained.

10 ... Pixel part, 10a ... First pixel part, 10b ... Second pixel part, 10c ... Third pixel part, 11a ... First luminescent nanocrystal particles, 11b ... Second luminescent nanocrystal particles , 12a ... first light-scattering particles, 12b ... second light-scattering particles, 20 ... light-shielding part, 30 ... light conversion layer, 40 ... base material, 100 ... color filter.

Claims (14)

Contains luminescent nanocrystal particles, thermosetting resin and organic solvent,
The thermosetting resin is alkali-insoluble, the LogP value of the organic solvent is −1.0 or more and 6.5 or less, the boiling point is 180 ° C. or more, and the temperature is 23 based on Japanese Industrial Standard JIS K0102. An ink composition characterized in that the dissolved oxygen concentration at ° C. is more than 0 and less than 6 mg / L. Contains luminescent nanocrystal particles, thermosetting resin and organic solvent,
The thermosetting resin is alkali-insoluble, the LogP value of the organic solvent is -1.0 or more and 6.5 or less, the boiling point is 180 ° C. or more, and the temperature is 23 based on the Japanese Industrial Standards JIS K0102. An ink composition for inkjet, wherein the dissolved oxygen concentration at ° C. is more than 0 and less than 6 mg / L. The method for producing an inkjet ink composition according to claim 2 , wherein the method for producing the ink composition comprises removing oxygen gas from the ink composition. The inkjet ink composition according to claim 2, wherein the dissolved oxygen concentration at a temperature of 23 ° C. is more than 0 and less than 0.4 mg / L based on Japanese Industrial Standards JIS K0102. The inkjet ink composition according to any one of claims 2 or 4 , wherein an alkali-insoluble coating film can be formed. The inkjet ink composition according to any one of claims 2, 4 or 5 , wherein the surface tension is 20 to 40 mN / m. The inkjet ink composition according to any one of claims 2, 4, 5 or 6 , which has a viscosity of 2 to 20 mPa · s. The inkjet ink composition according to any one of claims 2, 4, 5, 6 or 7 , which is for a color filter. A light conversion layer made of a cured product of the ink composition according to any one of claims 1 , 2, 4, 5, 6, 7 or 8. The light conversion layer in which the light conversion layer made of the cured product of the ink composition according to any one of claims 1 , 2, 4, 5, 6, 7 or 8 is alkaline-insoluble. An optical conversion layer having a plurality of pixel portions.
The plurality of pixel portions include a pixel portion containing a cured product of the inkjet ink composition according to any one of claims 2, 4, 5, 6, 7 or 8, an optical conversion layer. Further, a light-shielding portion provided between the plurality of pixel portions is further provided.
The plurality of pixel portions are
The cured product is contained, and the luminescent nanocrystal particles include luminescent nanocrystal particles that absorb light having a wavelength in the range of 420 to 480 nm and emit light having a emission peak wavelength in the range of 605 to 665 nm. , The first pixel part,
The cured product is contained, and the luminescent nanocrystal particles include luminescent nanocrystal particles that absorb light having a wavelength in the range of 420 to 480 nm and emit light having a emission peak wavelength in the range of 500 to 560 nm. The optical conversion layer according to any one of claims 9 to 11 , further comprising a second pixel portion. The optical conversion layer according to any one of claims 9 to 12 , further comprising a third pixel portion having a transmittance of 30% or more for light having a wavelength in the range of 420 to 480 nm. .. A color filter comprising the optical conversion layer according to any one of claims 9 to 13.

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