TW202039711A - Inkjet ink for color filter, light conversion layer and color filter - Google Patents

Abstract

One aspect of the present invention relates to an inkjet ink for a color filter, which contains luminescent nanocrystalline particles, a photopolymerizable compound and/or a thermosetting resin, and light-scattering particles. Rice grains have organic ligands on their surfaces. The total content of luminescent nano grains, organic ligands, photopolymerizable compounds, thermosetting resins and light scattering particles is based on the total mass of the inkjet ink , Is 41% by mass or more, and the total content of the luminescent nanocrystalline grains and organic ligands is relative to that of the luminescent nanocrystalline grains, organic ligands, photopolymerizable compounds, thermosetting resins, and light scattering particles The total content of 100 parts by mass is 21 parts by mass or more, the content of organic ligands is 20 parts by mass or more relative to the total content of 100 parts by mass of the luminescent nanocrystal grains and organic ligands, and the weight average molecular weight of the organic ligands Below 1000.

Description

Inkjet ink for color filter, light conversion layer and color filter

The invention relates to an inkjet ink for a color filter, a light conversion layer and a color filter.

Conventionally, the pixel portion (color filter pixel portion) in a display such as a liquid crystal display device is a curable resist containing red organic pigment particles or green organic pigment particles, and alkali-soluble resin and/or acrylic monomer. The agent material is manufactured by photolithography.

In recent years, there has been a strong demand for lower power consumption of displays, and therefore, research is being actively conducted to replace the red organic pigment particles or green organic pigment particles, and use, for example, quantum dots, quantum rods, other inorganic phosphor particles, etc. Nano crystal grains are used to form pixel parts such as red pixels and green pixels.

However, in the manufacturing method of the color filter using the photolithography method, due to the characteristics of the manufacturing method, there is a waste of resist other than the pixel portion including the relatively expensive luminescent nano crystal grains. Disadvantages of materials. Under such circumstances, in order to avoid the waste of the above-mentioned general resist material, research has begun to form the pixel portion of the light conversion substrate by the inkjet method (Patent Document 1). [Prior Art Literature] [Patent Literature]

[Patent Document 1] International Publication No. 2008/001693

[The problem to be solved by the invention] In inkjet inks containing luminescent nanocrystals, it is desirable to increase the luminescent nanocrystals from the viewpoint of improving the optical characteristics of the pixel portion (for example, improving external quantum efficiency (EQE)). (And the organic ligands given to the surface) content. Furthermore, although the film thickness of the pixel portion also needs to be thick, in order to form the pixel portion by the inkjet method, it is desirable to increase the content of non-volatile components in the inkjet ink. That is, when the content of non-volatile components in the inkjet ink is low (for example, when the total mass of the inkjet ink is 40% by mass or less), after printing the ink on the pixel portion, the volatile components The film thickness becomes thin due to volatilization, so multiple printing is required, and the production efficiency of inkjet may be significantly reduced. However, according to research conducted by the present inventors, it has been clarified that the content of luminescent nanocrystal grains (and the organic ligands provided on the surface) is high (for example, 21 parts per 100 mass parts of the non-volatile content of inkjet ink) Parts by mass or more) and a high content of non-volatile components (for example, 41% by mass or more based on the total mass of inkjet ink) inkjet inks tend to increase in viscosity, so it is difficult to ensure that they are suitable for the pixel In addition to the problem of the resulting viscosity, there is also the possibility of viscosity increase (viscosity) in an atmospheric gas environment.

Therefore, the object of the present invention is to provide an inkjet ink that contains luminescent nano crystal grains and has a high content of non-volatile components, has a viscosity suitable for the formation of the pixel portion, and can suppress the increase in the atmospheric gas environment. Sticky inkjet ink for color filter, and light conversion layer and color filter using the inkjet ink.

[Means to solve the problem] One aspect of the present invention relates to an inkjet ink for a color filter, which contains luminescent nanocrystalline particles, a photopolymerizable compound and/or a thermosetting resin, and light-scattering particles. Rice grains have organic ligands on their surfaces. The total content of luminescent nano grains, organic ligands, photopolymerizable compounds, thermosetting resins and light scattering particles is based on the total mass of the inkjet ink , Is 41% by mass or more, and the total content of the luminescent nanocrystalline grains and organic ligands is relative to that of the luminescent nanocrystalline grains, organic ligands, photopolymerizable compounds, thermosetting resins, and light scattering particles The total content of 100 parts by mass is 21 parts by mass or more, the content of organic ligands is 20 parts by mass or more relative to the total content of 100 parts by mass of the luminescent nanocrystal grains and organic ligands, and the weight average molecular weight of the organic ligands Below 1000.

The inkjet ink for the color filter of the present invention adopts the above-mentioned structure, and therefore contains luminescent nanocrystalline grains, and luminescent nanocrystalline grains, organic ligands, photopolymerizable compounds, and thermosetting An inkjet ink with a high total content of flexible resin and light-scattering particles (hereinafter, these components are also collectively referred to as "non-volatile components") has a viscosity suitable for the formation of the pixel portion and can be suppressed in the atmosphere Under the viscosity.

In the inkjet ink, the total content of luminescent nanocrystalline particles, organic ligands, photopolymerizable compounds, thermosetting resins, and light scattering particles is based on the total mass of the inkjet ink, and can be 70 Above mass%.

In the inkjet ink, the organic ligand may include a polyoxyalkylene group.

Another aspect of the present invention relates to a light conversion layer including a plurality of pixel portions and a light shielding portion provided between the plurality of pixel portions, the plurality of pixel portions having inkjet ink for color filters The light-emitting pixel portion of the cured material.

The light conversion layer, as the light-emitting pixel portion, may include: a first light-emitting pixel portion that absorbs light having a wavelength in the range of 420 nm to 480 nm and emits light having a peak wavelength in the range of 605 nm to 665 nm The luminescent nanocrystal grains of light; and the second luminescent pixel portion, which absorbs light with a wavelength in the range of 420 nm to 480 nm and emits light with a peak wavelength in the range of 500 nm to 560 nm. Nano grains.

The light conversion layer may further include a non-luminous pixel portion containing light-scattering particles.

Another aspect of the present invention relates to a color filter including the light conversion layer.

[Effects of the invention] According to the present invention, there is provided an inkjet ink that contains luminescent nano crystal grains and has a high content of non-volatile components, has a viscosity suitable for the formation of a pixel portion, and can suppress the thickening of the color in an atmospheric gas environment. Inkjet ink for filter, and light conversion layer and color filter using the inkjet ink.

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

＜Inkjet ink＞ The inkjet ink of one embodiment contains light-emitting nanocrystal particles, a photopolymerizable compound and/or a thermosetting resin, and light-scattering particles. This inkjet ink is an inkjet ink for color filters used for forming the pixel portion of the color filter by an inkjet method.

Since the inkjet ink of this embodiment is used to form the color filter pixel portion by the inkjet method, it is possible to form the color filter pixel portion (light conversion layer) only by using the necessary amount in the necessary portion. ) Without wasting relatively expensive materials such as luminescent nano grains and solvents.

[Luminescent Nanocrystals] Luminescent nanocrystals are nano-sized crystals that absorb excitation light and emit fluorescence or phosphorescence. For example, they are crystals with a maximum particle size of 100 nm or less as measured by a transmission electron microscope or a scanning electron microscope.

Luminescent nanocrystals can emit light (fluorescence or phosphorescence) of a wavelength different from the absorbed wavelength, for example, by absorbing light of a predetermined wavelength. The luminescent nanocrystal grains may be red luminescent nanocrystal grains (red luminescent nanocrystal grains) that emit light (red light) with a luminescence peak wavelength in the range of 605 nm to 665 nm. Green light-emitting nanocrystals (green light-emitting nanocrystals) with light (green light) in the range of 500 nm to 560 nm can emit light in the range of 420 nm to 480 nm. Blue light-emitting nanocrystal grains (blue light-emitting nanocrystal grains) of light with a peak wavelength (blue light). In this embodiment, the inkjet ink preferably includes at least one of the luminescent nanocrystal grains. Furthermore, the light absorbed by the luminescent nanocrystal grains may be light (blue light) having a wavelength in the range of 400 nm or more and less than 500 nm (especially light having a wavelength in the range of 420 nm to 480 nm), or 200 nm. Light (ultraviolet light) with a wavelength in the range of ~400 nm. In addition, the emission peak wavelength of the luminescent nanocrystal particles can be confirmed in, for example, a fluorescence spectrum or a phosphorescence spectrum measured using a spectrofluorometer.

The red luminescent nanocrystal grains are preferably 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 Below, 643 nm or less, 640 nm or less, 637 nm or less, 635 nm or less, 632 nm or less, or 630 nm or less has an emission peak wavelength, and preferably 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 have a peak emission wavelength. These upper limit and lower limit can be combined arbitrarily. In addition, in the same description below, the upper limit and the lower limit described separately may be combined arbitrarily.

The green luminescent nanocrystal grains are preferably 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 The luminescence peak wavelength is below, 532 nm or below, or 530 nm or below, and preferably 528 nm or above, 525 nm or above, 523 nm or above, 520 nm or above, 515 nm or above, 510 nm or above, 507 nm or above, 505 nm or above , 503 nm or above or above 500 nm has a peak wavelength of light emission.

The blue luminescent nanocrystal grains are preferably 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 It has an emission peak wavelength below nm, 452 nm or below 450 nm, and is preferably 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 Above or above 420 nm, there is an emission peak wavelength.

According to the solution of the Schrodinger wave equation of the well-type potential model, the wavelength (luminous color) of the light emitted by the luminescent nanocrystal grains depends on the size of the luminescent nanocrystal grains (such as particle size). ), but it also depends on the energy gap of the luminescent nanocrystalline grains. Therefore, the luminous color can be selected by changing the constituent material and size of the luminescent nanocrystal grains used.

The light-emitting nanocrystal grains may be light-emitting nanocrystal grains (light-emitting semiconductor nanocrystal grains) containing a semiconductor material. Examples of the light-emitting semiconductor nanocrystal grains include quantum dots, quantum rods, and the like. Among these, from the viewpoint of easy control of the emission spectrum, ensuring reliability, reducing production costs, and improving mass productivity, quantum dots are preferred.

The light-emitting semiconductor nanocrystal grains may be composed of only a core containing the first semiconductor material, or may have a core containing the first semiconductor material, and a core containing a second semiconductor material different from the first semiconductor material and covering the core At least part of the shell. In other words, the structure of the light-emitting semiconductor nanocrystal grains may be a structure composed only of a core (core structure), or a structure including a core and a shell (core/shell structure). Moreover, in addition to the shell (first shell) containing the second semiconductor material, the light-emitting semiconductor nanocrystal grains may also have a third semiconductor material that is different from the first semiconductor material and the second semiconductor material and cover the The shell (second shell) of at least a part of the core. In other words, the structure of the nanocrystalline light-emitting semiconductor may be a structure including a core, a first shell, and a second shell (core/shell/shell structure). The core and the shell may be mixed crystals containing two or more semiconductor materials (for example, CdSe+CdS, CIS+ZnS, etc.).

The luminescent nanocrystal grains preferably include selected from the group consisting of group II-VI semiconductors, group III-V semiconductors, group I-III-VI semiconductors, group IV semiconductors, and group I-II-IV-VI semiconductors At least one of the semiconductor materials is used as a semiconductor material.

Specific semiconductor materials include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, CdHgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeGaN, AlGa, AlN, As, GaS, Al, As InP, InAs, InSb, GaNP, GaNAS, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb, GaAlNAPAs, GaAlPSb, GaInNP, GaInNP GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb; SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, Se, PbSTe, SnPbTe, PbSTe, SnPb SnPbSTe; Si, Ge, SiC, SiGe, AgInSe 2, CuGaSe 2, CuInS 2, CuGaS 2, CuInSe 2, AgInS 2, AgGaSe 2, AgGaS 2, C, Si and Ge. From the viewpoints of easy control of the emission spectrum, ensuring reliability, reducing production costs, and improving mass productivity, the light-emitting semiconductor nanocrystal grains preferably contain selected from CdS, CdSe, CdTe, ZnS, 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, At least one of the group consisting of CuGaSe ₂ , CuGaTe ₂ , Si, C, Ge, and Cu ₂ ZnSnS ₄ .

Examples of red-emitting semiconductor nanocrystal grains include CdSe nanocrystal grains, nanocrystal grains with a core/shell structure and the shell part is CdS, and the inner core part is CdSe, and a core/shell structure. And the shell part is CdS, the inner core part is ZnSe nanocrystal grains, CdSe and ZnS mixed crystal nanocrystal grains, InP nanocrystal grains, with a core/shell structure and the shell part is ZnS, The inner core is made of InP nano grains, the core/shell structure is a mixed crystal of ZnS and ZnSe, the inner core is made of InP nano grains, and the CdSe and CdS mixed crystals. Crystal grains, nano grains of mixed crystals of ZnSe and CdS, nano grains with a core/shell/shell structure and the first shell part is ZnSe, the second shell part is ZnSe, and the inner core part is InP. Core/shell/shell structure, the first shell part is a mixed crystal of ZnS and ZnSe, the second shell part is ZnS, and the inner core part is InP nanocrystals.

As green light-emitting semiconductor nanocrystal grains, for example, CdSe nanocrystal grains, CdSe and ZnS mixed crystal nanocrystal grains, have a core/shell structure and the shell part is ZnS, and the inner core part is InP nano grains, with a core/shell structure and the shell part is a mixed crystal of ZnS and ZnSe, the inner core part is InP nano grains, with a core/shell/shell structure and the first shell part is ZnSe , The second shell part is ZnS, the inner core part is InP nano grains, with a core/shell/shell structure and the first shell part is a mixed crystal of ZnS and ZnSe, the second shell part is ZnS, the inner core The part is InP nano-grains, etc.

Examples of blue light-emitting semiconductor nanocrystal grains include ZnSe nanocrystal grains, ZnS nanocrystal grains, and nanocrystals with a core/shell structure and the shell part is ZnSe and the inner core part is ZnS. Crystal grains, CdS nano grains, nano grains with a core/shell structure and the shell part is ZnS, and the inner core part is InP, with a core/shell structure and the shell part is a mixed crystal of ZnS and ZnSe , The inner core part is InP nanocrystal grains, with core/shell/shell structure, the first shell part is ZnSe, the second shell part is ZnS, and the inner core part is InP nanocrystal grains, with core/shell structure Shell/shell structure, the first shell part is a mixed crystal of ZnS and ZnSe, the second shell part is ZnS, and the inner core part is InP nanocrystals.

Semiconductor nanocrystalline grains have the same chemical composition. By changing their average particle size, the color that the particles should emit light can be changed to red or green. Moreover, as the semiconductor nanocrystal grain itself, it is preferable to use one having extremely low adverse effects on the human body and the like. When semiconductor nanocrystal grains containing cadmium, selenium, etc. are used as luminescent nanocrystal grains, it is preferable to select semiconductor nanocrystal grains that do not contain these elements (cadmium, selenium, etc.) as much as possible and use them alone , Or used in combination with other luminescent nano grains to minimize the elements.

The shape of the luminescent nanocrystal grains is not particularly limited, and may be any geometric shape or any irregular shape. The shape of the luminescent nanocrystal grains may be, for example, a spherical shape, an ellipsoid shape, a pyramid shape, a disc shape, a dendritic shape, a mesh shape, a rod shape, and the like. However, from the viewpoint of further improving the uniformity and fluidity of the inkjet ink, as the luminescent nanocrystal grains, it is preferable to use particles having a particle shape and less directivity (for example, spherical, regular tetrahedral, etc. particle).

From the viewpoint of easily obtaining light emission of the desired wavelength and the viewpoint of excellent dispersibility and storage stability, the average particle diameter (volume average diameter) of the luminescent nanocrystal grains may be 1 nm or more, 1.5 nm or more, or It can be 2 nm or more. From the viewpoint of easily obtaining the desired emission wavelength, 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 grains 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 grains have organic ligands on their surfaces. For example, the organic ligand can be coordinately bonded to the surface of the light-emitting nanocrystal grains. In other words, the surface of the luminescent nanocrystal grains can be passivated by the organic ligand. Furthermore, when the inkjet ink further contains a polymer dispersant described later, the luminescent nanocrystal particles may have a polymer dispersant on their surface. In this embodiment, for example, the organic ligands can be removed from the luminescent nanocrystal grains with organic ligands, and the organic ligands and polymer dispersants can be exchanged to make the luminescent nanocrystals The surface of the particles is combined with a polymer dispersant. However, from the viewpoint of dispersion stability when forming an inkjet ink, it is preferable to formulate a polymer dispersant to the light-emitting nanocrystal particles in a state where an organic ligand is coordinated.

The organic ligand may include a functional group (hereinafter also referred to as “affinity group”) for ensuring affinity with a photopolymerizable compound, thermosetting resin, organic solvent, and the like. The affinity group may be a substituted or unsubstituted aliphatic hydrocarbon group. The aliphatic hydrocarbon group may be linear or may have a branched structure. Furthermore, the aliphatic hydrocarbon group may or may not have an unsaturated bond. The substituted aliphatic hydrocarbon may be a group in which a part of the carbon atoms of the aliphatic hydrocarbon group is substituted with oxygen atoms. The substituted aliphatic hydrocarbon group may include (poly)oxyalkylene, for example.

The organic ligand preferably contains a polyoxyalkylene group. The polyoxyalkylene group is a divalent group formed by linking two or more alkylene groups via an ether bond, and has a plurality of oxyalkylene groups (oxyalkylene groups). The plurality of alkylene groups constituting the polyoxyalkylene group may be the same or different from each other. The alkylene group may be linear or may have a branched structure.

The carbon number of the alkylene group may be, for example, 1 or more, 2 or more, or 3 or more, and may be 5 or less, 4 or less, or 3 or less. The alkylene group is preferably ethylene group, propylene group or butyl group. That is, the polyoxyalkylene group preferably has an oxyalkylene structure having an ethylene group (oxyethylene structure), an oxyalkylene structure having an ethylene group (oxyethylene structure), and At least one of the oxyalkylene structures (oxyethylene butylene structures) of the butylene group.

The polyoxyalkylene group preferably has an oxyalkylene structure represented by the following formula (1). [化1]

In formula (1), R ¹ and R ² each independently represent a hydrogen atom, a methyl group, or an ethyl group, and * represents a bonding bond. When one of R ¹ and R ² is a methyl group or an ethyl group, the other is preferably a hydrogen atom. R ¹ and R ^{2 are} preferably a hydrogen atom or a methyl group. Among them, more preferred is an oxyethylene structure in which R ¹ and R ² are hydrogen atoms, or an oxyethylene structure in which one of R ¹ and R ² is a methyl group and the other is a hydrogen atom.

When the polyoxyalkylene group has a plurality of structures represented by the formula (1), the plurality of R ¹ may be the same or different, and the plurality of R ² may be the same or different.

The degree of polymerization of the polyoxyalkylene group can be, for example, 2 or more, 4 or more, or 6 or more, and can be 40 or less, 30 or less, or 20 or less. Here, the degree of polymerization of polyoxyalkylene refers to the number of repetitions of the oxyalkylene structure (the number of alkylenes linked by ether bonds; when two or more kinds of oxyalkylenes are contained (oxyalkylene structure) In the case of, it is the total number of those).

In the case where the polyoxyalkylene group includes repetitions of the oxyethylene structure, the number of repetitions of the oxyethylene structure may be 2 or more, 4 or more or 6 or more, and may be 40 or less, 30 or less or 20 or less.

In the case where the polyoxyalkylene group includes repetitions of the oxypropylene structure, the number of repetitions of the oxypropylene structure may be 2 or more, 4 or more, or 6, and may be 40 or less, 30 or less, or 20 or less.

The polyoxyalkylene group may be contained in the main chain of the organic ligand. Here, the main chain refers to the longest of the molecular chains constituting the organic ligand.

The organic ligand preferably contains a functional group capable of bonding to the light-emitting nanocrystal grains (functional group for ensuring the adsorption of the light-emitting nanocrystal grains). Examples of the functional group capable of bonding to the luminescent nanocrystal grains include a hydroxyl group, an amino group, a carboxyl group, a thiol group, a phosphoric acid group, a phosphonic acid group, a phosphine group, a phosphine oxide group, and an alkoxysilyl group. These functional groups can be bonded to the luminescent nanocrystal grains through coordination bonds or the like.

The number of functional groups capable of bonding to the light-emitting nanocrystal grains in the organic ligand may be 1 to 3, may be 1 to 2, or may be 1. At least one of the functional groups capable of bonding to the light emitting nanocrystal grains among the organic ligands on the surface of the light emitting nanocrystal grains may be a functional group bonding to the light emitting nanocrystal grains. Furthermore, when the organic ligand contains a plurality of functional groups capable of bonding to the light-emitting nanocrystal grains, some of the plurality of functional groups may not be bonded to the light-emitting nanocrystal grains.

The functional group capable of bonding to the luminescent nanocrystal grains may be present at at least one end of the main chain of the organic ligand. That is, the organic ligand may include a functional group capable of bonding to the luminescent nanocrystal grains at at least one end of the main chain.

The organic ligand may have a hydrogen bonding group. Here, the hydrogen-bonding functional group refers to a group having a hydrogen atom capable of forming a hydrogen bond with a carbonyl group or the like. The hydrogen-bonding group may be a group capable of bonding to luminescent nanocrystal grains. The organic ligand present on the surface of the light-emitting nanocrystal grain preferably has a hydrogen-bonding group that is not bonded to the light-emitting nanocrystal grain. Examples of hydrogen-bonding groups include monovalent groups such as hydroxyl groups, amino groups, carboxyl groups, and thiol groups, and divalent groups such as amide groups (-NHCO-).

The organic ligand may have one or more first functional groups capable of bonding with the luminescent nano grains at one end of the main chain, and a second functional group different from the first functional group at the other end of the main chain . The first functional group may be the same as the functional group capable of bonding to the light-emitting nanocrystal grains. The number of first functional groups may be one or more, two or more, or two. The second functional group may be the same as the functional group capable of bonding to the light-emitting nanocrystal grains, or may be another group different from the functional group. Other groups may be, for example, alkyl groups, cycloalkyl groups, and aryl groups. The number of the second functional group may be 1 or more, or may be 1.

In addition to the polyoxyalkylene group, the main chain may have, for example, a substituted or unsubstituted hydrocarbon group. The carbon number of the substituted or unsubstituted hydrocarbon group may be 1-10, for example. In the substituted hydrocarbon group, part of the carbon atoms may be substituted with heteroatoms such as sulfur atoms and nitrogen atoms, carbonyl groups, and the like.

In one embodiment, the organic ligand may be a compound represented by the following formula (1-1). [化2]

In formula (1-1), p represents an integer of 0-50, and q represents an integer of 0-50. It is preferable that at least one of p and q is 1 or more, and it is more preferable that both of p and q are 1 or more.

式（1-2）中，r表示1～50整數。In one embodiment, the organic ligand may be an organic ligand represented by the following formula (1-2). [化3]

In formula (1-2), r represents an integer of 1-50.

In the organic ligand represented by formula (1-2), r may be an integer of 1-20, may be an integer of 3-15, may be an integer of 5-10, or may be 7.

The organic ligand may be a ligand having two or more functional groups capable of bonding to the light-emitting nanocrystal grains. That is, in one embodiment, the organic ligand may be a compound represented by the following formula (1-3). [化4]

In formula (1-3), A ¹ and A ² each independently represent a monovalent group that can include the functional group capable of bonding to the luminescent nanocrystal grains, and R represents a hydrogen atom, a methyl group or an ethyl group, L ¹ and L ² each independently represent a substituted or unsubstituted alkylene group, and s represents an integer of 0 or more. Wherein, at least one of A ¹ and A ² includes the functional group capable of bonding to the light-emitting nano grains, and the functional group of A ¹ and A ² capable of bonding to the light-emitting nano grains The total number is 2 or more. When A ¹ or A ² is a group that does not include a functional group capable of bonding to the light-emitting nanocrystal grains, A ¹ or A ² may be, for example, a hydrogen atom.

In the monovalent groups represented by A ¹ and A ² , the number of functional groups capable of bonding to the luminescent nanocrystal grains may be 1 or 2 or more, and may be 4 or less, or 2 . The functional group capable of bonding to the luminescent nanocrystal grains is preferably at least one selected from the group consisting of a hydroxyl group and a carboxyl group.

In one embodiment, it is preferable that the number of functional groups capable of bonding to the light-emitting nanocrystal grains in the monovalent group represented by A ¹ is two, and that the number of the monovalent groups represented by A ² can be The number of functional groups bonded to the light-emitting nanocrystal grains is one. In this case, it is more preferable that the two functional groups capable of bonding to the luminescent nanocrystal grains among the monovalent groups represented by A ¹ are both carboxyl groups, and the monovalent groups represented by A ² can be combined with The functional group to which the luminescent nanocrystal grains are bonded is a hydroxyl group.

In another embodiment, it is preferable that the number of functional groups capable of bonding to the luminescent nanocrystal grains in the monovalent group represented by A ¹ is 2, and A ² is a hydrogen atom (ie, A ² The number of functional groups capable of bonding to the light-emitting nanocrystal grains among the monovalent groups shown is 0). In this case, it is more preferable that the two functional groups capable of bonding to the light-emitting nanocrystal grains among the monovalent groups represented by A ¹ are both carboxyl groups.

The number of carbon atoms in the alkylene group represented by L may be, for example, 1-10. In the alkylene group represented by L, a part of carbon atoms (methylene groups) may be substituted with heteroatoms. When L is a substituted alkylene group, in the alkylene group, a part of the carbon atom (methylene group) is preferably selected from the group consisting of oxygen atom, sulfur atom, and nitrogen atom. At least one heteroatom is substituted, more preferably by a sulfur atom. s may be an integer of 1 or more, 3 or more, or 5 or more, or an integer of 100 or less, 20 or less, or 10 or less, for example.

式（1-4）中，x及y分別獨立地為0以上的整數，z為1以上的整數，A¹ 、A² 及s分別與式（1-3）中的A¹ 、A² 及s意義相同。其中，x及y中的至少一者為1以上的整數。The organic ligand may be a compound represented by the following formula (1-4). [化5]

In formula (1-4), x and y are each independently an integer greater than or equal to 0, z is an integer greater than or equal to ¹ , and A ¹ , A ² and s are respectively the same as A ¹ , A ² and in formula (1-3) s has the same meaning. However, at least one of x and y is an integer of 1 or more.

x may be an integer of 3 or less or 2 or less, and may be 1 or 0. y may be an integer of 1, 2, or 3, and may be an integer of 5, 4, or 3, or 3 may be sufficient. z can be an integer of 4 or less, 3 or less, or 1 or less.

式（1-5）及（1-6）中，s與式（1-3）中的s意義相同。The organic ligand may be a compound represented by the following formula (1-5) or (1-6). [化6]

In formulas (1-5) and (1-6), s has the same meaning as in formula (1-3).

Examples of organic ligands containing functional groups capable of bonding with luminescent nanocrystals include TOP (trioctyl phosphine), TOPO (trioctyl phosphine oxide), lauric acid, oleic acid, oleylamine, Octylamine, trioctylamine, cetylamine, octane mercaptan, dodecyl mercaptan, hexyl phosphonic acid (HPA), tetradecyl phosphonic acid (TDPA) and octyl phosphonic acid (OPA).

In one embodiment, the organic ligand may be an organic ligand represented by the following formula (1-7). [化7]

In formula (1-7), n represents an integer of 0-50, and m represents an integer of 0-50. n is preferably 0-20, more preferably 0-10. m is preferably 0-20, more preferably 0-10. It is preferable that at least one of n and m is 1 or more. That is, n+m is preferably 1 or more. n+m may be 10 or less. Z represents a substituted or unsubstituted alkylene group. The carbon number of the alkylene group may be 1-10, for example. In the alkylene group represented by Z, a part of the carbon atoms may be substituted by heteroatoms, or may be substituted by at least one heteroatom selected from the group consisting of oxygen atoms, sulfur atoms, and nitrogen atoms.

From the viewpoint that the viscosity of the inkjet ink becomes more suitable for the formation of the pixel portion, the weight average molecular weight of the organic ligand is 1000 or less, can be 900 or less, 800 or less, 700 or less, or 600 or less, and can be 250 Above, above 300, above 400, above 450, above 500, or above 550. In addition, in this specification, the weight average molecular weight is a weight average molecular weight in terms of polystyrene measured by Gel Permeation Chromatography (GPC).

As the luminescent nanocrystal particles, those dispersed in colloidal form in organic solvents, photopolymerizable compounds, etc. can be used. The surface of the light-emitting nanocrystal particles dispersed in an organic solvent is preferably passivated by the organic ligand. Examples of organic solvents include cyclohexane, hexane, heptane, chloroform, toluene, octane, chlorobenzene, tetralin, diphenyl ether, propylene glycol monomethyl ether acetate, and butyl carbitol ethyl. Acid ester, 1,4-butanediol diacetate, or a mixture of these.

As the luminescent nanocrystal grains, commercially available products can be used. As commercially available products of luminescent nanocrystalline grains, for example, indium phosphorus/zinc sulfide of NN-Labs, D-dots, CuInS/ZnS, Aldrich (Aldrich) ) The company's InP/ZnS, etc.

From the viewpoint that the effect of improving the maintenance rate of external quantum efficiency is more excellent, the content of luminescent nanocrystal grains is relative to the luminescent nanocrystal grains in inkjet ink, organic ligands, photopolymerizable compounds, and thermosetting The total content (total content of non-volatile components) 100 parts by mass of the resin and light-scattering particles is preferably more than 10 parts by mass, more preferably 13 parts by mass or more, and still more preferably 15 parts by mass or more. When the content of the luminescent nanocrystal grains exceeds 10 parts by mass, since excellent luminous intensity can be obtained, such an inkjet ink can be preferably used as a color filter. From the viewpoint of more excellent ejection stability, the content of luminescent nanocrystalline particles is relative to the luminescent nanocrystalline particles, organic ligands, photopolymerizable compounds, thermosetting resins, and light scattering properties in the inkjet ink The total content of particles (the total content of non-volatile components) 100 parts by mass is preferably 60 parts by mass or less, may be 50 parts by mass or less, may be 40 parts by mass or less, or may be 35 parts by mass or less. The content of luminescent nanocrystals relative to the total content of luminescent nanocrystals, organic ligands, photopolymerizable compounds, thermosetting resins, and light-scattering particles in the inkjet ink (total non-volatile components Content) 100 parts by mass can be more than 10 parts by mass and less than 60 parts by mass, 13 parts by mass to 60 parts by mass, 15 parts by mass to 60 parts by mass, more than 10 parts by mass and less than 50 parts by mass, more than 10 parts by mass and 40 parts by mass Parts or less, or more than 10 parts by mass and 35 parts by mass or less.

The total content of luminescent nanocrystals, organic ligands, photopolymerizable compounds, thermosetting resins, and light-scattering particles in inkjet ink (total content of non-volatile components) is based on the total mass of inkjet ink The standard is 41% by mass or more, and it can be 45% by mass or more, 50% by mass or more, 55% by mass or more, 60% by mass or more, 65% by mass or more, 70% by mass or more, 75% by mass or more, 80% by mass or more, 85% by mass or more, 90% by mass or more, or 95% by mass or more, or 100% by mass. The total content of the luminescent nanocrystal particles, organic ligands, photopolymerizable compounds, thermosetting resin, and light-scattering particles in the inkjet ink (the total content of non-volatile components) is based on the total mass of the inkjet ink When the standard is 70% by mass or more, it can be preferably used as a solvent-free inkjet ink.

In the case where the inkjet ink contains a photopolymerizable compound and does not contain a thermosetting resin, the total content of the non-volatile components is luminescent nanocrystalline particles, organic ligands, photopolymerizable compounds, and light scattering particles The total content. Moreover, when the inkjet ink contains a thermosetting resin and does not contain a photopolymerizable compound, the total content of the non-volatile components is luminescent nanocrystalline particles, organic ligands, thermosetting resin and light scattering The total content of sexual particles.

The inkjet ink may contain two or more of red light-emitting nanocrystal grains, green light-emitting nanocrystal grains, and blue light-emitting nanocrystal grains as light-emitting nanocrystal grains, but preferably contains only these One of the particles. In the case where the inkjet ink contains red luminescent nanocrystals, the content of green luminescent nanocrystals and the content of blue luminescent nanocrystals are based on the total mass of luminescent nanocrystals. It is preferably 10% by mass or less, and more preferably 0% by mass. In the case where the inkjet ink contains green luminescent nanocrystals, the content of red luminescent nanocrystals and the content of blue luminescent nanocrystals are based on the total mass of luminescent nanocrystals. It is preferably 10% by mass or less, and more preferably 0% by mass.

Relative to 100 parts by mass of the total content of luminescent nanocrystalline particles, organic ligands, photopolymerizable compounds, thermosetting resins, and light-scattering particles in inkjet ink, luminescent nanocrystalline particles and organic coordination The total content of the body is 21 parts by mass or more, can be 25 parts by mass or more, 27 parts by mass or more, 30 parts by mass or more, 35 parts by mass or more, 40 parts by mass or more, 45 parts by mass or more or 50 parts by mass or more, and can be 70 parts by mass or less, 65 parts by mass or less, 60 parts by mass or less, or 55 parts by mass or less.

From the viewpoint of suppressing the viscosity increase of inkjet ink caused by air exposure, the content of organic ligand is 20 parts by mass or more relative to the total content of 100 parts by mass of the luminescent nanocrystal grains and organic ligands. It is 25 parts by mass or more, 30 parts by mass or more, or 32 parts by mass or more, and may be 50 parts by mass or less, 45 parts by mass or less, 40 parts by mass or less, or 38 parts by mass or less. When the content of the organic ligand is 50 parts by mass or less relative to the total content of 100 parts by mass of the luminescent nanocrystal grains and organic ligands, the luminescent nanocrystals in the inkjet ink can be relatively improved. The content is therefore better. In this specification, the content of the organic ligand relative to the total content of 100 parts by mass of the luminescent nanocrystal grains and the organic ligand is defined as a mixture containing the luminescent nanocrystal grains and the organic ligand. Organic ratio (ratio of organic compound) obtained by TG-DTA measurement. The mixture containing the luminescent nanocrystal particles and the organic ligand can be obtained by adding a poor solvent of the mixture to the inkjet ink, allowing the mixture to settle, and then drying it.

[Photopolymerizable compound] The photopolymerizable compound of this embodiment is a compound polymerized by irradiation of light, and is, for example, a photoradical polymerizable compound or a photocationically polymerizable compound. The photopolymerizable compound may be a photopolymerizable monomer or oligomer. These can be used together with a photopolymerization initiator. The photo-radical polymerizable compound can be used together with a photo-radical polymerization initiator, and the photo-cationically polymerizable compound can be used together with a photo-cationic polymerization initiator. In other words, the inkjet ink may contain a photopolymerizable component containing a photopolymerizable compound and a photopolymerization initiator, and may contain a photoradical polymerizable component containing a photoradical polymerizable compound and a photoradical polymerization initiator. It may contain a photocationically polymerizable component containing a photocationically polymerizable compound and a photocationic polymerization initiator. A photoradical polymerizable compound and a photocationically polymerizable compound may be used in combination, a compound having photoradical polymerizability and photocationic polymerizability may be used, or a photoradical polymerization initiator and a photocationic polymerization initiator may be used in combination. A photopolymerizable compound may be used individually by 1 type, and may use 2 or more types together.

As the photoradical polymerizable compound, for example, a monomer having an ethylenically unsaturated group (hereinafter also referred to as an "ethylenically unsaturated monomer"), a monomer having an isocyanate group, and the like can be cited. Here, the ethylenically unsaturated monomer refers to a monomer having an ethylenically unsaturated bond (carbon-carbon double bond). Examples of ethylenically unsaturated monomers include monomers having ethylenically unsaturated groups such as vinyl groups, vinylidene groups, and vinylidene groups. Monomers having these groups are sometimes called "vinyl monomers".

The number of ethylenically unsaturated bonds in the ethylenically unsaturated monomer (for example, the number of ethylenically unsaturated groups) is 1 to 3, for example. An ethylenically unsaturated monomer may be used individually by 1 type, and may be used in combination of multiple types. From the viewpoint of easily reconciling excellent ejection stability with excellent curability and the viewpoint of further improving the external quantum efficiency, the photopolymerizable compound may include a monomer having one or two ethylenically unsaturated groups and a monomer having two or A monomer with 3 ethylenically unsaturated groups. That is, the ethylenically unsaturated monomer may be selected from monofunctional monomers and difunctional monomers, monofunctional monomers and trifunctional monomers, difunctional monomers and difunctional monomers, and difunctional monomers and trifunctional monomers. At least one combination in the group consisting of monomers. In this embodiment, the photopolymerizable compound preferably contains two or more monomers having two ethylenically unsaturated bonds.

As an ethylenically unsaturated group, (meth)acryloyl group etc. can also be mentioned in addition to a vinyl group, an vinylene group, and an vinylene group. In addition, in this specification, "(meth)acryloyl group" means "acryloyl group" and the corresponding "methacryloyl group". The performance of "(meth)acrylate" and "(meth)acrylamide" is the same.

Examples of monofunctional monomers include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, pentyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, nonyl (meth)acrylate, dodecyl (meth)acrylate, cetyl (meth)acrylate, Stearyl (meth)acrylate, cyclohexyl (meth)acrylate, methoxyethyl (meth)acrylate, butoxyethyl (meth)acrylate, phenoxy (meth)acrylate Ethyl, nonylphenoxyethyl (meth)acrylate, glycidyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate , Ethoxyethoxy ethyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentyl (meth)acrylate, dicyclopentenyl (meth)acrylate, (meth)acrylate Base) dicyclopentenyloxyethyl acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, Benzyl (meth)acrylate, phenylbenzyl (meth)acrylate, mono(2-propenoxyethyl) succinate, mono(2-methacryloxyethyl) succinate, N-[2-(acryloxy)ethyl]phthalimide, N-[2-(acryloxy)ethyl]tetrahydrophthalimide, acrylic acid 4-hydroxy Butyl ester, 2-hydroxypropyl acrylate, 2-hydroxyethyl acrylate, etc. Among these, ethoxyethoxyethyl (meth)acrylate can be preferably used.

Specific examples of monomers (difunctional monomers) having two ethylenically unsaturated groups include 1,3-butanediol bis(meth)acrylate, 1,4-butanediol bis(meth) Base) acrylate, 1,5-pentanediol di(meth)acrylate, 3-methyl-1,5-pentanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate Base) acrylate, neopentyl glycol di(meth)acrylate, 1,8-octanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, tricyclodecane Alkylene dimethanol di(meth)acrylate, ethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, dipropylene glycol di(meth) Acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol hydroxypivalate diacrylate, tris(2-hydroxyethyl) isocyanurate Di(meth)acrylate in which 2 hydroxyl groups are substituted by (meth)acryloyloxy groups, di(meth)acrylates obtained by adding 4 mols of ethylene oxide or propylene oxide to 1 mol of neopentyl glycol Di(meth)acrylate in which the two hydroxyl groups of the alcohol are substituted by (meth)acryloyloxy groups, and two moles of ethylene oxide or propylene oxide obtained by adding 2 moles of ethylene oxide or propylene oxide to 1 mole of bisphenol A Di(meth)acrylate in which two hydroxyl groups of alcohol are substituted by (meth)acryloyloxy groups, and 3 moles of ethylene oxide or propylene oxide are added to 1 mole of trimethylolpropane Di(meth)acrylate in which 2 hydroxyl groups of the obtained triol are substituted by (meth)acryloyloxy groups, and 4 mol or more of ethylene oxide or propylene oxide is added to 1 mol of bisphenol A The obtained diol has a di(meth)acrylate etc. in which two hydroxyl groups are substituted with (meth)acryloyloxy groups. Among these, dipropylene glycol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, and 1,6-hexanediol diacrylate can be preferably used.

Specific examples of the monomer (trifunctional monomer) having three ethylenically unsaturated groups include glycerin tri(meth)acrylate, trimethylolethane tri(meth)acrylate, and the like. Among these, glycerol tri(meth)acrylate can be preferably used.

Examples of the photocationically polymerizable compound include epoxy compounds, oxetane compounds, and vinyl ether compounds.

Examples of epoxy compounds include bisphenol A epoxy compounds, bisphenol F epoxy compounds, phenol novolac epoxy compounds, trimethylolpropane polyglycidyl ether, neopentyl glycol diglycidyl ether, etc. Aliphatic epoxy compound, 1,2-epoxy-4-vinylcyclohexane, 1-methyl-4-(2-methyloxacyclopropyl)-7-oxabicyclo[4.1.0 ]Heptane and other alicyclic epoxy compounds, etc.

As an epoxy compound, you may use a commercial item. As commercial products of epoxy compounds, for example, "Celloxide 2000", "Celloxide 3000", and "Celloxide 2000" manufactured by Daicel Chemical Industries Co., Ltd. can be used. Rosside (Celloxide) 4000" and so on.

Examples of cationically polymerizable oxetane compounds include 2-ethylhexyloxetane, 3-hydroxymethyl-3-methyloxetane, and 3-hydroxymethyl-3- Ethyloxetane, 3-hydroxymethyl-3-propyloxetane, 3-hydroxymethyl-3-n-butyloxetane, 3-hydroxymethyl-3-benzene Oxetane, 3-hydroxymethyl-3-benzyloxetane, 3-hydroxyethyl-3-methyloxetane, 3-hydroxyethyl-3-ethyloxy Etidine, 3-hydroxyethyl-3-propyloxetane, 3-hydroxyethyl-3-phenyloxetane, 3-hydroxypropyl-3-methyloxetane Butane, 3-hydroxypropyl-3-ethyloxetane, 3-hydroxypropyl-3-propyloxetane, 3-hydroxypropyl-3-phenyloxetane , 3-hydroxybutyl-3-methyloxetane, etc.

As the oxetane compound, a commercially available product can also be used. As a commercially available product of the oxetane compound, for example, Aron Oxetane Series manufactured by Toagosei Co., Ltd. ("OXT-101", "OXT-212", "OXT -121", "OXT-221", etc.); "Celloxide 2021", "Celloxide 2021A", "Celloxide 2021" manufactured by Daicel Chemical industries (Daicel Chemical industries) Co., Ltd. "Rosid (Celloxide) 2021P", "Celloxide 2080", "Celloxide 2081", "Celloxide 2083", "Celloxide 2080" 2085", "Epolead GT300", "Epolead GT301", "Epolead GT302", "Epolead GT400", "Epolead GT400", "Epolead GT401" and "Epolead GT403"; "Cyracure UVR-6105" manufactured by Dow Chemical Japan Co., Ltd., "Cyracure ) UVR-6107", "Cyracure UVR-6110", "Cyracure UVR-6128", "ERL4289" and "ERL4299" etc. Moreover, a well-known oxetane compound (for example, the oxetane compound described in JP 2009-40830 and the like) can also be used.

Examples of the vinyl ether compound include 2-hydroxyethyl vinyl ether, triethylene glycol vinyl monoether, tetraethylene glycol divinyl ether, trimethylolpropane trivinyl ether, and the like.

Furthermore, as the photopolymerizable compound in this embodiment, the photopolymerizable compound described in paragraphs 0042 to 0049 of JP 2013-182215 A can also be used.

From the viewpoint of easily obtaining a pixel portion (cured material of inkjet ink) with excellent reliability, the photopolymerizable compound may be alkali-insoluble. In this specification, the fact that the photopolymerizable compound is alkali-insoluble means that the amount of the photopolymerizable compound dissolved in a 1% by mass potassium hydroxide aqueous solution at 25° C. is 30% by mass or less based on the total mass of the photopolymerizable compound. The dissolved amount of the photopolymerizable compound is preferably 10% by mass or less, more preferably 3% by mass or less.

From the viewpoints that it is easy to obtain the appropriate viscosity for inkjet inks, the viewpoints that the curability of inkjet inks becomes better, and the viewpoints that the solvent resistance and abrasion resistance of the pixel portion (cured material of inkjet inks) are improved Starting from the point of view, the content of the photopolymerizable compound relative to 100 parts by mass of the total content of the luminescent nanocrystal particles, organic ligands, photopolymerizable compound, thermosetting resin, and light scattering particles in the inkjet ink can be 10 parts by mass or more, 15 parts by mass or more, or 20 parts by mass or more. From the viewpoint of easily obtaining an appropriate viscosity as an inkjet ink and the viewpoint of obtaining more excellent optical properties (for example, the effect of suppressing the reduction of external quantum efficiency), the content of the photopolymerizable compound is relative to the light emission in the inkjet ink. The total content of nanocrystalline grains, organic ligands, photopolymerizable compounds, thermosetting resins, and light-scattering particles is 100 parts by mass, which can be 60 parts by mass or less, 50 parts by mass or less, or 40 parts by mass Parts or less, may be 30 parts by mass or less, or may be 20 parts by mass or less.

[Photopolymerization initiator] The photopolymerization initiator is, for example, a photoradical polymerization initiator. As the photoradical polymerization initiator, a molecular cleavage type or dehydrogenation type photoradical polymerization initiator is preferred.

As the molecular cleavage type photo-radical polymerization initiator, benzoin isobutyl ether, 2,4-diethylthioxanthone, 2-isopropylthioxanthone, 2,4,6- Trimethylbenzyldiphenylphosphine oxide, 2-benzyl-2-dimethylamino-1-(4-morpholinylphenyl)-butane-1-one, bis(2,6 -Dimethoxybenzyl)-2,4,4-trimethylpentyl phosphine oxide, (2,4,6-trimethylbenzyl)ethoxyphenyl phosphine oxide, etc. As a molecular cleavage type photo-radical polymerization initiator other than these, 1-hydroxycyclohexyl phenyl ketone, benzoin ethyl ether, benzyl dimethyl ketal, 2-hydroxy-2-methyl may be used in combination. -1-Phenylpropane-1-one, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropane-1-one and 2-methyl-1-(4-methylthio) Phenyl)-2-morpholinylpropan-1-one.

As the dehydrogenation type photoradical polymerization initiator, benzophenone, 4-phenylbenzophenone, meta-benzophenone, 4-benzyl-4'-methyl-benzophenone can be mentioned. Base sulfide and so on. A molecular cleavage-type photoradical polymerization initiator and a dehydrogenation-type photoradical polymerization initiator can also be used in combination.

As the photocationic polymerization initiator, commercially available products may also be used. Commercially available products include "CPI-100P" manufactured by San-apro Company and other sulphate-based photocationic polymerization initiators, and "Lucirin TPO manufactured by BASF" "Irgacure" and other phosphine oxide compounds, "Irgacure 907", "Irgacure 819", "Irgacure 379EG", "Irgacure (Irgacure) 819" manufactured by BASF Irgacure 184" and "Irgacure PAG290" etc.

From the viewpoint of the curability of the inkjet ink, the content of the photopolymerization initiator relative to 100 parts by mass of the photopolymerizable compound may be 0.1 parts by mass or more, 0.5 parts by mass or more, or 1 part by mass or more. It is 3 parts by mass or more, and may be 5 parts by mass or more. From the viewpoint of the temporal stability of the pixel portion (the cured product of the inkjet ink), the content of the photopolymerization initiator may be 40 parts by mass or less, or 30 parts by mass or less relative to 100 parts by mass of the photopolymerizable compound. It may be 20 parts by mass or less, or 10 parts by mass or less.

[Thermosetting resin] In this embodiment, the thermosetting resin is a resin that is cured by being crosslinked by heat. The thermosetting resin is, for example, a resin that functions as a binder in a cured product. The thermosetting resin has a curable base. Examples of curable groups include epoxy groups, oxetanyl groups, isocyanate groups, amino groups, carboxyl groups, methylol groups, etc., from the viewpoint of excellent heat resistance and storage stability of the cured product of inkjet inks, and From the viewpoint of excellent adhesion to a light-shielding portion (for example, a black matrix) and a substrate, an epoxy group is preferred. The thermosetting resin may have one type of curable group or two or more types of curable groups.

In addition, thermosetting resins include resins with photo-radical polymerizability (polymerized by light irradiation when used together with a photo-radical polymerization initiator) and resins with photo-cationic polymerizability (with photo-cation polymerization). When the initiator is used together, it is polymerized by light irradiation). When the inkjet ink contains a photo-radical polymerizable thermosetting resin and a photo-radical polymerization initiator, the photo-radical polymerizable thermosetting resin is classified as a photo-radical polymerizable compound ( Photopolymerizable compound). When the inkjet ink contains a photocationically polymerizable thermosetting resin and a photocationic polymerization initiator, the photocationically polymerizable thermosetting resin is classified as a photocationically polymerizable compound (photopolymerizable compound). ).

The thermosetting resin may be a polymer of a single monomer (homopolymer) or a copolymer of multiple monomers (copolymer). Furthermore, 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 groups per molecule can be used, and it is usually used in combination with a curing agent. In the case of using a thermosetting resin, a catalyst (hardening accelerator) that can promote the thermosetting reaction can be further added. In other words, the inkjet ink may contain a thermosetting component containing a thermosetting resin (and a curing agent and a curing accelerator used as needed). Moreover, in addition to these, polymers that are not themselves polymerizable can be used.

As the compound having two or more thermosetting groups in one molecule, for example, an epoxy resin having two or more epoxy groups in one molecule (hereinafter also referred to as "multifunctional epoxy resin") can be used. "Epoxy resin" includes both monomeric epoxy resin and polymer epoxy resin. The number of epoxy groups that the polyfunctional epoxy resin has in one molecule is preferably from 2 to 50, and more preferably from 2 to 20. The epoxy group should just be a structure which has an oxirane ring structure, For example, a glycidyl group, an oxyethylene group, an epoxycyclohexyl group etc. are mentioned. As an epoxy resin, the well-known polyvalent epoxy resin which can be hardened by carboxylic acid is mentioned. Such epoxy resins are widely disclosed in, for example, "Epoxy Resin Handbook" Nikkan Kogyo Shimbun (1987) edited by Shinbo Masaki, and they can be used.

Examples of thermosetting resins having epoxy groups (including multifunctional epoxy resins) include polymers of monomers having an oxirane ring structure, monomers having an oxirane ring structure, and other monomers. Copolymer. Specific examples of multifunctional epoxy resins include polyglycidyl methacrylate, methyl methacrylate-glycidyl methacrylate copolymer, benzyl methacrylate-glycidyl methacrylate copolymer, and N-butyl acrylate-glycidyl methacrylate copolymer, 2-hydroxyethyl methacrylate-glycidyl methacrylate copolymer, methacrylic acid (3-ethyl-3-oxetanyl) Methyl ester-glycidyl methacrylate copolymer, styrene-glycidyl methacrylate, etc. Furthermore, as the thermosetting resin of this embodiment, the compound described in paragraphs 0044 to 0066 of JP 2014-56248 A can also be used.

Furthermore, as the polyfunctional epoxy resin, for example, bisphenol A type epoxy resin, bisphenol F type epoxy resin, brominated bisphenol A type epoxy resin, bisphenol S type epoxy resin, and diphenyl ether can be used. Type epoxy resin, hydroquinone type epoxy resin, naphthalene type epoxy resin, biphenyl type epoxy resin, fluorene type epoxy resin, phenol novolak type epoxy resin, o-cresol novolak type epoxy resin , Trihydroxyphenylmethane epoxy resin, trifunctional epoxy resin, tetraphenol ethane epoxy resin, dicyclopentadiene phenol epoxy resin, hydrogenated bisphenol A epoxy resin, bisphenol A core-containing polyol type epoxy resin, polypropylene glycol type epoxy resin, glycidyl ester type epoxy resin, glycidylamine type epoxy resin, glyoxal type epoxy resin, alicyclic epoxy resin, heterocyclic ring Type epoxy resin etc.

More specifically, it can be exemplified: bisphenol A epoxy resin such as the brand name "Epicoat 828" (manufactured by Nippon Epoxy Resin), and the brand name "YDF-175S" (Toto Brominated bisphenol A type epoxy resins such as the product name "YDB-715" (manufactured by Toto Chemical Co., Ltd.), the product name "EPICLON EXA1514" (DIC) Co., Ltd.) and other bisphenol S-type epoxy resins, brand name "YDC-1312" (manufactured by Toto Kasei Co., Ltd.) and other hydroquinone-type epoxy resins, brand name "EPICLON EXA4032", " "HP-4770", "HP-4700", "HP-5000" (manufactured by DIC Co., Ltd.) and other naphthalene type epoxy resins, and the trade name "Epicoat YX4000H" (Nippon Epoxy Resin ) Biphenyl type epoxy resin such as manufactured by the company, brand name "Epicoat 157S70" (manufactured by Nippon Epoxy Resin) and other bisphenol A novolac type epoxy resin, brand name "Epicoat 154" (manufactured by Nippon Epoxy Resin), brand name "YDPN-638" (manufactured by Toto Kasei Co., Ltd.) and other phenol novolac type epoxy resins, brand name "YDCN- "701" (manufactured by Toto Kasei Co., Ltd.) and other cresol novolac type epoxy resins, trade names "EPICLON HP-7200", "HP-7200H" (manufactured by DIC Co., Ltd.) and other dicyclopentadienes Phenolic epoxy resin, brand name "Epicoat 1032H60" (manufactured by Nippon Epoxy Resin) and other trihydroxyphenylmethane type epoxy resin, brand name "VG3101M80" (Mitsui Chemical Co., Ltd.) Manufacture) and other trifunctional epoxy resins, trade name "Epicoat (Epicoat) 1031S" (Nippon Epoxy Resin) and other tetraphenol ethane type epoxy resins, trade name "Dana 4-functional epoxy resin such as Denacol EX-411" (manufactured by Nagase Chemical Industry Co., Ltd.), hydrogenated bisphenol A epoxy resin such as trade name "ST-3000" (manufactured by Toto Kasei Co., Ltd.), Glycidyl ester type epoxy resins such as the brand name "Epicoat 190P" (manufactured by Nippon Epoxy Resin), and glycidyl amines such as the brand name "YH-434" (manufactured by Toto Kasei Co., Ltd.) Type epoxy resin, trade name "YDG-414" (manufactured by Toto Kasei Co., Ltd.), etc. Alicyclic polyfunctional epoxy compounds such as dialdehyde type epoxy resin, trade name "Epolead GT-401" (manufactured by Daicel Chemical Co., Ltd.), triglycidyl isocyanate (TGIC), etc. Heterocyclic epoxy resin, etc. And, if necessary, it is possible to mix the product name "Neotohto E" (manufactured by Totoh Chemical Co., Ltd.) as an epoxy reactive diluent.

Moreover, as a multifunctional epoxy resin, "FINEDIC A-247S", "FINEDIC A-254", "FINEDIC A-254" manufactured by DIC Co., Ltd. can be used. ) A-253", "FINEDIC A-229-30A", "FINEDIC A-261", "FINEDIC A249", "Fine Dic (FINEDIC) A-266", "FINEDIC A-241", "FINEDIC M-8020", "EPICLON N-740", "Abby Clone ( EPICLON N-770", "EPICLON N-865", "EPICLON EXA-4850-150" (trade name), etc.

From the viewpoints that it is easy to obtain the appropriate viscosity for inkjet inks, the viewpoints that the curability of inkjet inks becomes better, and the viewpoints that the solvent resistance and abrasion resistance of the pixel portion (cured material of inkjet inks) are improved Starting from the point of view, the weight average molecular weight of the thermosetting resin may be 750 or more, may be 1,000 or more, or may be 2,000 or more. From the viewpoint of achieving an appropriate viscosity as an inkjet ink, it may be 500,000 or less, 300,000 or less, or 200,000 or less. However, the molecular weight after crosslinking is not limited to this.

From the viewpoints that it is easy to obtain the appropriate viscosity for inkjet inks, the viewpoints that the curability of inkjet inks becomes better, and the viewpoints that the solvent resistance and abrasion resistance of the pixel portion (cured material of inkjet inks) are improved Starting from the point of view, the content of the thermosetting resin relative to 100 parts by mass of the total content of the luminescent nanocrystal particles, organic ligands, photopolymerizable compounds, thermosetting resin and light scattering particles in the inkjet ink can be 5 parts by mass or more, may be 10 parts by mass or more, may be 15 parts by mass or more, or may be 20 parts by mass or more. 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, the content of the thermosetting resin is relative to the luminescent nanocrystal in the inkjet ink. The total content of particles, organic ligands, photopolymerizable compounds, thermosetting resins, and light-scattering particles may be 60 parts by mass or less, 50 parts by mass or less, or 40 parts by mass or less in 100 parts by mass. 30 parts by mass or less, and 20 parts by mass or less.

[hardener] Examples of the curing agent used for curing the thermosetting resin include acid anhydrides, phenol compounds, and amine compounds. These curing agents may be used individually by 1 type, and may be used in combination of 2 or more types. The hardening agent preferably includes at least one selected from the group consisting of acid anhydrides, phenolic compounds, and amine compounds. Furthermore, when an epoxy resin is used as a thermosetting resin, onium salts, organometallic complexes, tertiary amines, imidazoles, etc. may be used for self-polymerization.

Examples of acid anhydrides (acid anhydride-based hardeners) include: 4-methylcyclohexane-1,2-dicarboxylic anhydride (4M-HHPA), 3-methylcyclohexane-1,2-dicarboxylic anhydride, ring Hexane-1,2-dicarboxylic anhydride, 1,2,3,6-tetrahydrophthalic anhydride, 3-methyl-1,2,3,6-tetrahydrophthalic anhydride, 4- Methyl-1,2,3,6-tetrahydrophthalic anhydride, bicyclo[2.2.1]heptane-2,3-dicarboxylic anhydride, methylbicyclo[2.2.1]heptane-2,3 -Dicarboxylic anhydride, methyl-3,6-endomethylene-1,2,3,6-tetrahydrophthalic anhydride, 3,6-endomethylene-1,2,3,6-tetrahydro Phthalic anhydride, phthalic anhydride, trimellitic anhydride, pyromellitic anhydride, maleic anhydride, etc.

Examples of phenolic compounds (phenolic hardeners) include bisphenol A, bisphenol F, bisphenol S, resorcinol, catechol, hydroquinone, fluorene bisphenol, 4,4'- Biphenol, 4,4',4''-trihydroxytriphenylmethane, naphthalenediol, 1,1,2,2-tetra(4-hydroxyphenyl)ethane, calixresorcinol aromatic hydrocarbon, phenolic aldehyde Varnish-type phenol resin (for example, phenol novolak resin, cresol novolak resin, bisphenol A novolak resin, bisphenol S novolak resin, resorcinol novolak resin, which is composed of polyhydric hydroxyl compounds and formaldehyde Polyphenol novolak resin, naphthol-phenol co-condensation novolak resin, naphthol-cresol co-condensation novolak resin, naphthol novolak resin, and modified novolac resin containing alkoxy aromatic ring (using formaldehyde to link phenol core And polyphenol compounds containing alkoxy aromatic rings), aralkyl phenol resins (such as phenol aralkyl resins such as xylok resins and naphthol aralkyl resins), aromatic hydrocarbon-formaldehyde resins High-quality phenol resin, dicyclopentadiene phenol addition molding resin, trimethylolmethane resin, tetraphenol ethane resin, biphenyl modified phenol resin (polyhydric phenol compound that uses bismethylene to connect the phenol core), Polyphenols such as benzene-modified naphthol resin (polyvalent naphthol compound that uses bismethylene to connect phenol nuclei), aminotriazine-modified phenol resin (polyphenol compound that uses melamine, benzoguanamine, etc. to connect phenol nucleus) Compound etc. From the viewpoint of excellent external quantum efficiency improvement effect, the phenol-based compound preferably contains a novolak-type phenol resin. As the novolak type phenol resin, a phenol novolak resin, a cresol novolak resin, and a bisphenol A novolak resin can be preferably used.

As specific examples of novolak-type phenol resins, "PHENOLITE TD-2131", "PHENOLITE TD-2090" (trade name) manufactured by DIC Co., Ltd., and Nippon Ka "GPH-65" and "GPH-103" (trade name) manufactured by Pharmaceutical Co., Ltd.

Examples of amine compounds (amine curing agents) include fats such as ethylene diamine, propylene diamine, butane diamine, hexamethylene diamine, diethylene triamine, triethylene tetramine, and pentaethylene hexaamine. Group polyamines, meta-xylylenediamine, diaminodiphenylmethane, phenylenediamine (Phenylenediamine) and other aromatic polyamines, 1,3-bis(aminomethyl)cyclohexane, isophor Polyamide resin synthesized from ketone diamine, norbornane diamine and other alicyclic polyamines, dicyandiamine, linolenic acid (linolenic acid) dimer and ethylene diamine.

Regarding the curing agent, from the viewpoint of the external quantum efficiency and heat resistance of the cured product of the inkjet ink, it is desirable to use an acid anhydride curing agent, from the viewpoint of the curing property of the cured product of the inkjet ink and the viscosity stability of the inkjet ink. From the start, it is desirable to use a phenolic hardener.

The content of the hardener may be 40 parts by mass relative to 100 parts by mass of the total content of the luminescent nanocrystal particles, organic ligands, photopolymerizable compound, thermosetting resin, and light scattering particles in the inkjet ink, for example Below, it may be 30 parts by mass or less, 20 parts by mass or less, or 10 parts by mass or less. The content of the hardener may be 1 part by mass relative to 100 parts by mass of the total content of the luminescent nanocrystal particles, organic ligands, photopolymerizable compound, thermosetting resin, and light scattering particles in the inkjet ink, for example The above may be 3 parts by mass or more.

[Hardening accelerator (hardening catalyst)] Examples of the curing accelerator (curing catalyst) used for curing the thermosetting resin include phosphorus-based compounds, tertiary amine compounds, imidazole compounds, metal salts of organic acids, Lewis acids, amine complexes, and the like. Examples of phosphorus-based compounds include triphenylphosphine, tri-p-tolylphosphine, diphenylcyclohexylphosphine, and methyltributylphosphonium iodide. As the tertiary amine compound, for example, N,N-dimethylbenzylamine, 1,8-diazabicyclo(5,4,0)undecene-7, 1,5-diazabicyclo (4,3,0) Nonene-5, tris(dimethylaminomethyl)phenol. Examples of the imidazole compound include 1-cyanoethyl-2-ethyl-4-methylimidazole and 2-ethyl-4-methylimidazole.

The thermosetting resin may be alkali-insoluble from the viewpoint of easily obtaining a pixel portion (cured product of inkjet ink) with excellent reliability. The fact that the thermosetting resin is alkali-insoluble means that the dissolved amount of the thermosetting resin at 25° C. with respect to 1% by mass of the potassium hydroxide aqueous solution is 30% by mass or less based on the total mass of the thermosetting resin. The dissolved amount of the thermosetting resin is preferably 10% by mass or less, and more preferably 3% by mass or less.

In this embodiment, the inkjet ink only needs to contain at least one of a photopolymerizable compound and a thermosetting resin, and may also contain both a photopolymerizable compound and a thermosetting resin. When the inkjet ink contains a photopolymerizable compound, it may not contain a thermosetting resin. In addition, when the inkjet ink contains a thermosetting resin, it may not contain a photopolymerizable compound. From the viewpoints of the storage stability of inkjet ink containing light-emitting nanocrystal particles (such as quantum dots) and the durability (humid heat stability, etc.) of the pixel portion (cured material of inkjet ink), it is preferable to use light The thermosetting resin among polymerizable compounds and thermosetting resins, the storage stability of inkjet inks containing luminescent nanocrystal grains (such as quantum dots), and the ability to prevent deterioration caused by heating of quantum dots From the viewpoint of curing at a low temperature, it is more preferable to use a photo-radical polymerizable compound, which can form the pixel portion (cured product of inkjet ink) without being hindered by oxygen in the curing process. To use a photocationic polymerizable compound.

In the case where the inkjet ink contains a photopolymerizable compound and a thermosetting resin, it is easy to obtain an appropriate viscosity for the inkjet ink, the curability of the inkjet ink becomes good, and the pixel portion (jet From the viewpoint of improving the solvent resistance and abrasion resistance of the cured product of the ink, the total content of the photopolymerizable compound and thermosetting resin is relative to the luminescent nanocrystal particles and organic ligands in the inkjet ink. , The total content of the photopolymerizable compound, thermosetting resin and light scattering particles is 100 parts by mass, which can be 3 parts by mass or more, 5 parts by mass or more, 10 parts by mass or more, or 15 parts by mass or more, It may be 20 parts by mass or more. Moreover, since 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, compared with the light-emitting nanocrystals and organic compounds in the inkjet ink. The total content of the substrate, the photopolymerizable compound, the thermosetting resin, and the light-scattering particles is 100 parts by mass. The total content of the photopolymerizable compound and the thermosetting resin may be 60 parts by mass or less, or 40 parts by mass or less. , It may be 20 parts by mass or less.

[Light Scattering Particles] The light-scattering particles are, for example, optically inactive inorganic fine particles. When the inkjet ink contains light-scattering particles, the light from the light source irradiated to the pixel portion can be scattered, and therefore, excellent optical characteristics can be obtained.

Examples of materials constituting light-scattering particles include elemental metals such as tungsten, zirconium, titanium, platinum, bismuth, rhodium, palladium, silver, tin, platinum (platina), and gold; silicon dioxide, barium sulfate, and barium carbonate , Calcium carbonate, talc, clay, kaolin, barium sulfate, barium carbonate, calcium carbonate, alumina white, titanium oxide, magnesium oxide, barium oxide, aluminum oxide, bismuth oxide, zirconium oxide, zinc oxide and other metal oxides; magnesium carbonate , Barium carbonate, bismuth subcarbonate, calcium carbonate and other metal carbonates; aluminum hydroxide and other metal hydroxides; barium zirconate, calcium zirconate, calcium titanate, barium titanate, strontium titanate and other composite oxides; hyponitric acid Metal salts such as bismuth, etc. From the viewpoint of excellent ejection stability and the viewpoint that the effect of improving external quantum efficiency is more excellent, the light-scattering particles are preferably selected from the group consisting of titanium oxide, aluminum oxide, zirconium oxide, zinc oxide, calcium carbonate, barium sulfate, and titanic acid. At least one selected from the group consisting of barium and silicon dioxide, more preferably includes at least one selected from the group consisting of titanium oxide, zirconium oxide, zinc oxide, and barium titanate.

The shape of the light-scattering particles may be spherical, filamentous, indeterminate, and the like. However, as light-scattering particles, since the uniformity, fluidity, and light-scattering properties of inkjet inks can be further improved, and excellent ejection stability can be obtained, it is preferable to use particles having a particle shape and less directivity. (For example, spherical, tetrahedral, etc. particles).

From the viewpoint of excellent ejection stability and the viewpoint that the effect of improving external quantum efficiency is more excellent, the average particle diameter (volume average diameter) of the light-scattering particles in the inkjet ink can be 0.05 μm (50 nm) or more. 0.2 μm (200 nm) or more, but also 0.3 μm (300 nm) or more. From the viewpoint of excellent ejection stability, the average particle diameter (volume average diameter) of the light-scattering particles in inkjet ink can be 1.0 μm (1000 nm) or less, 0.6 μm (600 nm) or less, or Below 0.4 μm (400 nm). The average particle diameter (volume average diameter) of the light-scattering particles in the inkjet ink can be 0.05 μm to 1.0 μm, 0.05 μm to 0.6 μm, 0.05 μm to 0.4 μm, 0.2 μm to 1.0 μm, 0.2 μm to 0.6 μm, 0.2 μm to 0.4 μm, 0.3 μm to 1.0 μm, 0.3 μm to 0.6 μm, or 0.3 μm to 0.4 μm. From the viewpoint of easily obtaining such an average particle diameter (volume average diameter), the average particle diameter (volume average diameter) of the light-scattering particles used may be 0.05 μm or more, and may be 1.0 μm or less. In this specification, the average particle diameter (volume average diameter) of the light-scattering particles in inkjet ink is measured by a dynamic light scattering nanotorac particle size distribution meter, and the volume average diameter is calculated And get. In addition, the average particle diameter (volume average diameter) of the light-scattering particles used can be obtained, for example, by measuring the particle diameter of each particle with a transmission electron microscope or a scanning electron microscope, and calculating the volume average diameter.

From the viewpoint that the effect of improving external quantum efficiency is more excellent, the content of light-scattering particles in inkjet ink is relative to the luminescent nanocrystal particles, organic ligands, photopolymerizable compounds, and thermosetting in inkjet ink. The total content of 100 parts by mass of the resin and light-scattering particles can be 0.1 parts by mass or more, 1 part by mass or more, 5 parts by mass or more, 7 parts by mass or more, 10 parts by mass or more, or It is 12 parts by mass or more. From the viewpoint of excellent ejection stability and the viewpoint that the effect of improving external quantum efficiency is more excellent, the content of light-scattering particles is relative to the luminescent nanocrystalline particles, organic ligands, photopolymerizable compounds, The total content of the thermosetting resin and the light-scattering particles 100 parts by mass may be 60 parts by mass or less, 50 parts by mass or less, 40 parts by mass or less, 30 parts by mass or less, or 25 parts by mass or less, It may be 20 parts by mass or less, or 15 parts by mass or less. When the inkjet ink contains a polymer dispersant, even when the content of the light-scattering particles is relatively large (for example, when the content is about 60 parts by mass), the light-scattering particles can be dispersed well.

From the viewpoint of the excellent effect of improving external quantum efficiency, the mass ratio of the content of light-scattering particles to the content of luminescent nanocrystal grains (light-scattering particles/luminescent nanocrystal grains) can be 0.01 or more. It may be 0.02 or more, may be 0.05 or more, may be 0.07 or more, may be 0.1 or more, may be 0.2 or more, or may be 0.5 or more. From the viewpoint that the effect of improving the external quantum efficiency is more excellent, and the continuous ejection property (ejection stability) during inkjet printing is excellent, the mass ratio (light-scattering particles/luminescent nano-grains) can be 5.0 or less. 2.0 or less, but also 1.5 or less.

From the standpoint of easily obtaining an appropriate viscosity for inkjet ink, the content of inorganic components in inkjet ink (for example, the total amount of luminescent nanocrystal particles and light scattering particles) is relative to the luminescence of inkjet ink The total content of nanocrystalline grains, organic ligands, photopolymerizable compounds, thermosetting resins, and light-scattering particles is 100 parts by mass, preferably 5 parts by mass or more, more preferably 10 parts by mass or more, and more preferably It is 20 parts by mass or more. From the standpoint of easily obtaining an appropriate viscosity as an inkjet ink, the content of inorganic components in inkjet ink (for example, the total amount of luminescent nanocrystal particles and light scattering particles) is relative to the luminosity of inkjet ink The total content of nanocrystal grains, organic ligands, photopolymerizable compounds, thermosetting resins, and light-scattering particles is 100 parts by mass, preferably 80 parts by mass or less, more preferably 50 parts by mass or less, and still more preferably 40 parts by mass or less. The content of inorganic components in inkjet inks (for example, the total amount of luminescent nanocrystalline particles and light-scattering particles) relative to the luminescent nanocrystalline particles, organic ligands, photopolymerizable compounds, and The total content of the thermosetting resin and the light-scattering particles 100 parts by mass may be 5 parts by mass to 80 parts by mass, 10 parts by mass to 50 parts by mass, or 20 parts by mass to 40 parts by mass.

The inkjet ink may further contain other components than the above-mentioned components within a range that does not hinder the effects of the present invention. Examples of other components include polymer dispersants, solvents, and antioxidants.

[Polymer Dispersant] The polymer dispersant is a polymer compound having a weight average molecular weight of 750 or more and having a functional group having affinity for light-scattering particles. The polymer dispersant has a function of dispersing light-scattering particles. The polymer dispersant is adsorbed on the light-scattering particles via the functional groups that have affinity for the light-scattering particles, and the light-scattering particles are dispersed in the inkjet by the electrostatic repulsion and/or steric repulsion of the polymer dispersants. In the ink. The polymer dispersant is preferably combined with the surface of the light-scattering particles and adsorbed on the light-scattering particles, but it may also be combined with the surface of the light-emitting nanocrystal particles and adsorbed on the light-emitting nanoparticle, or free from the spray Ink in ink.

Examples of the functional group having affinity for light-scattering particles include an acidic functional group, a basic functional group, and a nonionic functional group. Acidic functional groups have dissociative protons, which can be neutralized by bases such as amines and hydroxide ions, and basic functional groups can also be neutralized by acids such as organic acids and inorganic acids.

Examples of acidic functional groups include carboxyl groups (-COOH), sulfo groups (-SO ₃ H), sulfate groups (-OSO ₃ H), phosphonic acid groups (-PO(OH) ₃ ), phosphoric acid groups (-OPO( OH) ₃ ), phosphinic acid group (-PO(OH)-), mercapto group (-SH).

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

Examples of non-ionic functional groups include hydroxyl groups, ether groups, thioether groups, sulfinyl groups (-SO-), sulfinyl groups (-SO ₂ -), carbonyl groups, formyl groups, ester groups, and carbonate groups. , Amide group, aminomethanyl group, urea group, thioamide group, thiourea group, sulfamate group, cyano group, alkenyl group, alkynyl group, phosphine oxide group, phosphine sulfide group.

The polymer dispersant can be a polymer of a single monomer (homopolymer) or a copolymer of multiple monomers (copolymer). Furthermore, the polymer dispersant may be any one of random copolymers, block copolymers, or graft copolymers. Furthermore, 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 can be, for example, acrylic resin, polyester resin, polyurethane resin, polyamide resin, polyether, phenol resin, silicone resin, polyurea resin, amino resin, epoxy resin, poly Polyamines such as ethyleneimine and polyallylamine, polyimine, etc.

As a polymer dispersant, commercially available products can also be used. As a commercially available product, Ajisper PB series manufactured by Ajinomoto Fine-Techno Co., Ltd. and BYK manufactured DISPERBYK series and BYK-series, Efka series manufactured by BASF, etc.

As commercially available polymer dispersants, for example, "DISPERBYK-130" and "DISPERBYK-161" manufactured by BYK-Chemie can be used. "DISPERBYK-162", "DISPERBYK-163", "DISPERBYK-164", "DISPERBYK-166" ", "DISPERBYK-167", "DISPERBYK-168", "DISPERBYK-170", "DISPERBYK (DISPERBYK) -171", "DISPERBYK-174", "DISPERBYK-180", "DISPERBYK-182", "Disperbyk ( DISPERBYK-183", "DISPERBYK-184", "DISPERBYK-185", "DISPERBYK-2000", "Disperbyk "DISPERBYK-2001", "DISPERBYK-2008", "DISPERBYK-2009", "DISPERBYK-2020", "DISPERBYK-2008", "DISPERBYK-2022", "DISPERBYK-2025", "DISPERBYK-2050", "DISPERBYK-2070", " "DISPERBYK-2096", "DISPERBYK-2150", "DISPERBYK-2155", "DISPERBYK-2163" , "DISPERBYK-2164", "BYK-LPN21116" and "BYK-LPN6919"; "EFKA4010", "EFKA4015", "EFKA4046", "EFKA4047", "BYK-LPN6919" manufactured by BASF EFKA4061", "EFKA4080", "EFKA4300", "EFKA4310", "EFKA4320", "EFKA4330", "EFKA4340", "EFKA4560", "EFKA4585", "EFKA5207", "EFKA1501", "EFKA1502", "EFKA1503" And "EFKA PX-4701"; Lubrizol (Lubrizol ) "Solsperse 3000", "Solsperse 9000", "Solsperse 13240", "Solsperse 13650", "Solsperse 13650" manufactured by the company "Solsperse 13940", "Solsperse 11200", "Solsperse 13940", "Solsperse 16000", "Solsperse" 17000", "Solsperse 18000", "Solsperse 20000", "Solsperse 21000", "Solsperse 24000", "Sonu "Solsperse 26000", "Solsperse 27000", "Solsperse 28000", "Solsperse 32000", "Solsperse 32000" ", "Solsperse 32550", "Solsperse 32600", "Solsperse 33000", "Solsperse 34750", "Sonupa "Solsperse 35100", "Solsperse 35200", "Solsperse 36000", "Solsperse 37500", "Solsperse 38500" , "Solsperse 39000", "Solsperse 41000", "Solsperse 54000", "Solsperse 71000" and "Solsperse 71000" (Solsperse 76500"; "Ajisper PB821", "Ajisper PB822", "Ajisper (Ajisper) PB821" manufactured by Ajinomoto Fine-Techno Co., Ltd. Ajisper PB881", "PN411" and "PA111"; "TEGO Dispers 650", "TEGO Dispers (Dispers) 660C", "TEGO Dispers" manufactured by Evonik "Dispers (Dispers) 662C", "TEGO Dispers (Dispers) 670", "TEGO Dispers (Dispers) 685", "TEGO "Dispers 700", "TEGO Dispers 710" and "TEGO Dispers 760W"; "Disparlon (Disparlon) DA-703- manufactured by Kusei Kasei 50", "DA-705" and "DA-725" etc.

[Solvent] Examples of the solvent include ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol dibutyl ether, and diethyl adipate. Esters, dibutyl oxalate, dimethyl malonate, diethyl malonate, dimethyl succinate, diethyl succinate, 1,4-butanediol diacetate, glyceryl triacetic acid Ester etc.

From the viewpoint of the continuous ejectability of the inkjet ink, the boiling point of the solvent under atmospheric pressure is preferably 150°C or higher, more preferably 180°C or higher. Furthermore, when forming the pixel portion, it is necessary to remove the solvent from the inkjet ink before curing of the inkjet ink. Therefore, from the viewpoint of easy removal of the solvent, the boiling point of the solvent under atmospheric pressure is preferably 300° C. or less.

In the inkjet ink of this embodiment, the photopolymerizable compound also functions as a dispersing medium, so it is possible to disperse light-scattering particles and luminescent nanocrystal particles without solvent. In this case, there is an advantage that the step of removing the solvent by drying is not required when forming the pixel portion.

[Antioxidants] Inkjet inks can also contain antioxidants. In this case, the quantum yield can be improved, and the decrease in the quantum yield over time can be further suppressed. The antioxidant may be, for example, a phosphite compound, a thioether compound, etc., and from the viewpoint of improving the quantum yield and further suppressing the decrease of the quantum yield with time, a phosphite compound is preferable.

The antioxidant may be a phosphite triester compound. The phosphite triester compound may be a compound represented by the following formula (2). [化8]

In formula (2), R ¹¹ , R ¹² and R ¹³ each independently represent a monovalent organic group. Two selected from R ¹¹ , R ¹² and R ¹³ may be bonded to each other to form a ring. The monovalent organic group may be, for example, a monovalent hydrocarbon group. As a monovalent hydrocarbon group, an alkyl group, an aryl group, an alkenyl group, etc. are mentioned, for example. The carbon number of the monovalent hydrocarbon group may be 1-30, or 4-18.

Specific examples of the compound represented by formula (2) include triphenyl phosphite (triphenyl phosphite), 2-ethylhexyl diphenyl phosphite, diphenyl octyl phosphite, etc. .

The phosphite triester compound can be liquid or solid at room temperature (25°C), but it can fully satisfy the compatibility with other components (photopolymerizable compounds, etc.) in the inkjet ink. This inkjet ink From the viewpoint that the unique required performance can further suppress the decrease in the quantum yield of the inkjet ink, it is preferably a liquid at room temperature (25°C). The melting point of the phosphite triester compound may be 20°C or lower or 10°C or lower.

From the viewpoint of further suppressing the decrease in the quantum yield of inkjet inks, compared to the luminescent nanocrystals, organic ligands, photopolymerizable compounds, thermosetting resins, and light scattering properties in inkjet inks The total content of the particles is 100 parts by mass, and the content of the antioxidant may be 0.01 parts by mass or more, 0.1 parts by mass or more, 1 part by mass or more, or 5 parts by mass or more. Since even a small amount of addition can more effectively suppress the decrease in quantum yield, the content of antioxidants is relative to the luminescent nano grains, organic ligands, photopolymerizable compounds, and thermosetting resins in inkjet inks. The total content of the light-scattering particles is 100 parts by mass, preferably 10 parts by mass or less, more preferably 7 parts by mass or less, still more preferably 5 parts by mass or less, and still more preferably 3 parts by mass or less. When the content of the antioxidant is within the above range, during the formation of the coating film, in addition to ensuring better film strength, the bleeding of the antioxidant to the surface is further suppressed, and good optical properties can be ensured.

In the case where the inkjet ink contains a photopolymerizable compound, from the viewpoint of further suppressing the decrease in the quantum yield of the inkjet ink, the content of the antioxidant may be 0.01 parts by mass or more relative to 100 parts by mass of the photopolymerizable compound. It is 0.1 part by mass or more, may be 0.5 part by mass or more, may be 1 part by mass or more, or may be 3 parts by mass or more. Since even a small amount of addition can more effectively suppress the decrease in the quantum yield, the content of the antioxidant can be 10 parts by mass or less, 7 parts by mass or less, or 5 parts by mass relative to 100 parts by mass of the photopolymerizable compound. The following. When the content of the antioxidant is within the above range, when the coating film is formed, in addition to ensuring better film strength, it also has the function of further suppressing the bleeding of the antioxidant to the surface and ensuring good optical properties tendency.

Regarding the viscosity of the inkjet ink described above at the ink temperature during inkjet printing (for example, a temperature range of 25°C to 40°C), for example, from the viewpoint of ejection stability during inkjet printing, it can be 2 mPa･s Above, it can be 5 mPa･s or more, or 7 mPa･s or more. From the viewpoint of obtaining an inkjet ink suitable for the formation of the pixel portion, the viscosity of the inkjet ink at the ink temperature (for example, a temperature range of 25°C to 40°C) during inkjet printing can be 17 mPa･s or less. It is 15 mPa･s or less, or 12 mPa･s or less. The viscosity of the inkjet ink at the ink temperature (for example, the temperature range of 25°C to 40°C) during inkjet printing can be, for example, 2 mPa･s～17 mPa･s, 2 mPa･s～15 mPa･s, 2 mPa ･S～12 mPa･s, 5 mPa･s～17 mPa･s, 5 mPa･s～15 mPa･s, 5 mPa･s～12 mPa･s, 7 mPa･s～17 mPa･s, 7 mPa ･S～15 mPa･s, or 7 mPa･s～12 mPa･s. For example, the viscosity of the inkjet ink at 40°C may be in the range. In this specification, the viscosity of inkjet ink is, for example, the viscosity measured with an E-type viscometer.

When the viscosity of the inkjet ink at the ink temperature during inkjet printing is 2 mPa･s or more, the shape of the meniscus of the inkjet ink at the tip of the ink ejection hole of the nozzle is stable, so the ejection control of the inkjet ink (such as Control of ejection amount and ejection timing) becomes easy. On the other hand, when the viscosity of the inkjet ink at the ink temperature during inkjet printing is 17 mPa･s or less, the inkjet ink can be smoothly ejected from the ink ejection hole, and the pixel portion is easily formed.

The surface tension of the inkjet ink is preferably the surface tension suitable for the inkjet method, specifically, it is preferably in the range of 20 mN/m to 40 mN/m, more preferably 25 mN/m to 35 mN/m. By setting the surface tension in this range, ejection control (for example, control of ejection amount and ejection timing) becomes easy, and the occurrence of flight curvature can be suppressed. In addition, the flying curve means that when the inkjet ink is ejected from the ink ejection hole, the landing position of the inkjet ink is shifted by 30 μm or more from the target position. When the surface tension is 40 mN/m or less, the shape of the meniscus at the tip of the ink ejection hole is stable, so the ejection control of the inkjet ink (for example, ejection amount and ejection timing control) becomes easy. On the other hand, when the surface tension is 20 mN/m or more, it is possible to prevent the inkjet ink from contaminating the periphery of the ink ejection orifice, thereby suppressing the occurrence of flying bow. That is, there will be no cases in which the inkjet ink is incorrectly landed on the pixel portion forming area to be landed and the inkjet ink is insufficiently filled, or the inkjet ink is landed adjacent to the pixel portion forming area to be landed The pixel portion of the pixel portion forms a region (or pixel portion) and the color reproducibility is reduced. The inkjet ink may have the surface tension at the ink temperature (for example, a temperature range of 25°C to 40°C) during inkjet printing, or may have the surface tension at 40°C.

The inkjet ink of this embodiment is preferably applied to an inkjet recording apparatus of a piezoelectric jet (Piezojet) method based on a mechanical ejection mechanism using a piezoelectric element. In the piezoelectric ejection method, the inkjet ink will not be exposed to high temperature instantaneously during each ejection. Therefore, the luminescent nanocrystal grains are less likely to be deteriorated, and it is easier to obtain the expected light-emitting characteristics in the pixel portion (light conversion layer).

From the viewpoint of suppressing the inkjet ink coating film from absorbing moisture in the atmosphere and suppressing the decrease in the luminescence (for example, fluorescence) of the luminescent nanocrystal grains (quantum dots, etc.) even with the passage of time, in this embodiment The coating film of the inkjet ink is preferably alkali-insoluble. That is, the inkjet ink of this embodiment is preferably an inkjet ink capable of forming an alkali-insoluble coating film. Such an inkjet ink can be obtained by using an alkali-insoluble photopolymerizable compound and/or an alkali-insoluble thermosetting resin as the photopolymerizable compound and/or thermosetting resin. The fact that the coating film of the inkjet ink is alkali-insoluble means that the dissolved amount of the coating film of the inkjet ink at 25°C relative to the 1% by mass aqueous potassium hydroxide solution is based on the total mass of the coating film of the inkjet ink. It is 30% by mass or less. The dissolved amount of the coating film of the inkjet ink is preferably 10% by mass or less, and more preferably 3% by mass or less. In addition, the inkjet ink is an inkjet ink capable of forming an alkali-insoluble coating film, which can be obtained by coating the inkjet ink on a substrate and then drying it at 80°C for 3 minutes. The said dissolved amount of the coating film of thickness 1 micrometer was measured and confirmed.

<Method of manufacturing inkjet ink> The inkjet ink of the above-mentioned embodiment is obtained, for example, by mixing the constituent components of the inkjet ink and performing a dispersion treatment.

The manufacturing method of inkjet ink includes, for example, a first step of preparing a dispersion of light-scattering particles containing light-scattering particles; and a second step of mixing the dispersion of light-scattering particles and luminescent nanocrystal particles. As the luminescent nanocrystal grains, a luminescent nanocrystal grain having an organic ligand on its surface is used. That is, the luminescent nanocrystal particle dispersion further contains an organic ligand. The dispersion of light-scattering particles may further contain a polymer dispersant. In this method, the dispersion of light-scattering particles may further contain a photopolymerizable compound and/or a thermosetting resin, and in the second step, a photopolymerizable compound and/or a thermosetting resin may be further mixed. According to this method, the light-scattering particles can be sufficiently dispersed. Therefore, the optical characteristics of the pixel portion can be improved, and inkjet ink with excellent ejection stability can be easily obtained.

In the step of preparing a dispersion of light-scattering particles, the light-scattering particles can be prepared by mixing the light-scattering particles with a polymer dispersant, a photopolymerizable compound, and/or a thermosetting resin as appropriate, and then performing a dispersion treatment. Dispersion of sexual particles. The mixing and dispersion treatment can be performed using a dispersion device such as a bead mill, a paint conditioner, a planetary mixer, and a jet mill. Since the dispersibility of the light-scattering particles becomes better and the average particle diameter of the light-scattering particles can be easily adjusted to a desired range, it is preferable to use a bead mill or a paint conditioner. By mixing the light-scattering particles and the polymer dispersant before mixing the light-emitting nanocrystal particles and the light-scattering particles, the light-scattering particles can be more fully dispersed. Therefore, it is possible to more easily obtain excellent ejection stability and excellent external quantum efficiency.

The manufacturing method of inkjet ink may further include a step of preparing a dispersion of luminescent nanocrystalline particles containing luminescent nanocrystalline particles and an organic solvent before the second step. In this case, in the second step, a dispersion of light-scattering particles and a dispersion of luminescent nanocrystal particles are mixed. In the step of preparing a dispersion of luminescent nanocrystal particles, the dispersion of luminescent nanocrystal particles can be prepared by mixing the luminescent nanocrystal particles with an organic solvent and performing a dispersion treatment. The mixing and dispersion treatment can be carried out using a dispersion device such as a bead mill, a paint conditioner, a planetary mixer, and a jet mill. From the viewpoint that the dispersibility of the self-luminous nanocrystal grains becomes better and the average particle size of the luminous nanocrystal grains can be easily adjusted to the desired range, it is preferable to use a bead mill, a paint conditioner, or a spray mill machine. According to this method, the luminescent nanocrystal grains can be sufficiently dispersed. Therefore, the optical characteristics of the pixel portion can be improved, and inkjet ink with excellent ejection stability can be easily obtained. In the above step, a photopolymerizable compound and/or thermosetting resin may be further contained in the dispersion of the luminescent nanocrystal grains.

In this manufacturing method, the organic solvent may be formulated in the first step or may be formulated in the second step. That is, the first step may be a step of preparing a dispersion of light-scattering particles containing light-scattering particles, a polymer dispersant, and an organic solvent, and the second step may be a mixing of a dispersion of light-scattering particles and luminescent nanoparticles. Grain and organic solvent steps.

The manufacturing method of the inkjet ink may further include a step of mixing an organic solvent with a thermosetting resin and/or a photopolymerizable compound, and preparing a solution containing the thermosetting resin and/or a photopolymerizing compound. In this case, in the second step, the light-scattering particle dispersion, luminescent nanocrystal particle dispersion, solution containing thermosetting resin and/or photopolymerizable compound prepared in the step can be combined with organic Solvent mixing. That is, the second step may be a step of mixing a light-scattering particle dispersion, a light-emitting nanocrystal particle dispersion, a solution containing a thermosetting resin and/or a photopolymerizable compound, and an organic solvent.

In this production method, components other than the above-mentioned components can be further used. In this case, other components may be contained in the luminescent nanocrystal particle dispersion, or may be contained in the light-scattering particle dispersion. Furthermore, other components may be mixed in a composition obtained by mixing a luminescent nanocrystal particle dispersion and a light-scattering particle dispersion.

＜Ink jet ink set (ink jet ink set)＞ The inkjet ink set of one embodiment includes the inkjet ink of the above embodiment. In addition to the inkjet ink (luminescent inkjet ink) of the above-mentioned embodiment, the inkjet ink set may also include inkjet ink (non-luminescent inkjet ink) that does not contain luminescent nanocrystal particles. The non-luminescent inkjet ink may be a previously known inkjet ink, and may have the same composition as the inkjet ink (luminescent inkjet ink) of the above-mentioned embodiment except that it does not contain luminescent nanocrystals.

The non-luminescent inkjet ink does not contain luminescent nanocrystalline particles, so when light is incident on the pixel portion formed by the non-luminescent inkjet ink (the pixel portion containing the cured product of the non-luminescent inkjet ink) , The light emitted from the pixel portion has approximately the same wavelength as the incident light. Therefore, the non-luminescent inkjet ink can be preferably used to form a pixel portion of the same color as the light from the light source. For example, when the light from the light source is light (blue light) having a wavelength in the range of 420 nm to 480 nm, the pixel portion formed of the non-luminescent inkjet ink may become the blue pixel portion.

The non-luminescent inkjet ink preferably contains light-scattering particles. When the non-luminescent inkjet ink contains light-scattering particles, the pixel portion formed by the non-luminescent inkjet ink can scatter the light incident on the pixel portion, thereby reducing the light emitted from the pixel portion The light intensity difference in the angle of view.

<Light conversion layer, color filter, and manufacturing method of these> Hereinafter, the details of the light conversion layer and the color filter obtained by using the inkjet ink set of the aforementioned embodiment will be described with reference to the drawings. In addition, in the following description, the same symbols are used for the same or equivalent elements, and repeated descriptions are omitted.

Fig. 1 is a schematic cross-sectional view of a color filter according to an embodiment. As shown in FIG. 1, the color filter 100 includes a substrate 40 and a light conversion layer 30 provided on the substrate 40. The light conversion layer 30 includes a plurality of pixel portions 10 and light shielding portions 20.

The light conversion layer 30 has a first pixel portion 10 a, a second pixel portion 10 b, and a third pixel portion 10 c as the pixel portion 10. The first pixel portion 10a, the second pixel portion 10b, and the third pixel portion 10c are arranged in a grid so as to overlap in this order. The light shielding portion 20 is provided 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 pixel portion 10c and the first pixel portion 10c. Between the pixel portions 10a. In other words, the adjacent pixel portions are separated from each other by the light shielding portion 20.

Each of the first pixel portion 10a and the second pixel portion 10b is a light-emitting pixel portion (light-emitting pixel portion) including a cured product of the inkjet ink of the above-mentioned embodiment. The hardened product contains luminescent nanocrystalline grains, hardening components and light-scattering particles. The curing component is a component obtained by polymerization of a photopolymerizable compound and/or curing (polymerization, crosslinking, etc.) of a thermosetting resin, and a cured body of a polymer containing a photopolymerizable compound and/or a thermosetting resin . That is, the first pixel portion 10a includes the first hardening component 13a and the first light-emitting nanocrystal grains 11a and the first light-scattering particles 12a dispersed in the first hardening component 13a, respectively. Similarly, the second pixel portion 10b includes a second hardening component 13b, and second light-emitting nanocrystalline grains 11b and second light scattering particles 12b dispersed in the second hardening component 13b, respectively. 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 the first light-scattering particles 12a and the second light-scattering particles 12b may be the same or different different.

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

The total content of the luminescent nanocrystal grains and organic ligands in the luminescent pixel portion is based on the total mass of the luminescent pixel portion, which is 21 mass% or more, and can be 25 mass% or more, 27 mass% or more, or 30 mass% % Or more, 35% by mass or more, 40% by mass or more, 45% by mass or more, or 50% by mass or more, and may be 70% by mass or less, 65% by mass or less, 60% by mass or less, or 55% by mass or less.

From the viewpoint that the effect of improving external quantum efficiency is more excellent, the content of the light-scattering particles in the light-emitting pixel portion is based on the total mass of the light-emitting pixel portion, and may be 0.1% by mass or more, and may be 1% by mass or more. It may be 3% by mass or more, or 5% by mass or more. From the viewpoint that the effect of improving the external quantum efficiency is more excellent and the reliability of the pixel portion is excellent, the content of light-scattering particles is based on the total mass of the light-emitting pixel portion, and may be 60% by mass or less, or 50% by mass. % Or less, may be 40% by mass or less, or may be 30% by mass or less.

The third pixel portion 10c is a non-luminescent pixel portion (non-luminescent pixel portion) including a cured product of the non-luminescent inkjet ink. The hardened product does not contain luminescent nano grains, but contains light-scattering particles and hardening components. The curing component is, for example, a component obtained by polymerization of a photopolymerizable compound and/or curing (polymerization, crosslinking, etc.) of a thermosetting resin, and curing of a polymer containing a photopolymerizable compound and/or thermosetting resin body. That is, the third pixel portion 10c includes the third hardening component 13c and the third light-scattering particles 12c dispersed in the third hardening component 13c. The third light-scattering particle 12c, the first light-scattering particle 12a, and the second light-scattering particle 12b may be the same or different.

The third pixel portion 10c has a transmittance of 30% or more with respect to light having a wavelength in the range of 420 nm to 480 nm, for example. Therefore, the third pixel portion 10c functions as a blue pixel portion when a light source that emits light having a wavelength in the range of 420 nm to 480 nm is used. In addition, the transmittance of the third pixel portion 10c can be measured by a microscopy device.

From the viewpoint of further reducing the difference in light intensity in the angle of view, the content of light-scattering particles in the non-luminescent pixel portion is based on the total mass of the non-luminescent pixel portion, and may be 1% by mass or more. 5% by mass or more, but also 10% by mass or more. From the viewpoint of further reducing light reflection, the content of light-scattering particles is based on the total mass of the non-luminescent pixel portion, and may be 80% by mass or less, 75% by mass or less, or 70% by mass or less.

The thickness of the pixel portion (the first pixel portion 10a, the second pixel portion 10b, and the third pixel portion 10c) may be, for example, 1 μm or more, 2 μm or more, 3 μm or more, 4 μm or more, 5 μm or more, or 6 μm or more. And it can be 30 μm or less or 20 μm or less.

The light shielding section 20 is a so-called black matrix provided for the purpose of separating adjacent pixel sections to prevent color mixing and for preventing light leakage from the light source. The material constituting the light-shielding portion 20 is not particularly limited. In addition to metals such as chromium, a cured resin composition containing light-shielding particles such as carbon particles, metal oxides, inorganic pigments, and organic pigments in the binder polymer may also be used. . As the binder polymer used here, one or two resins such as polyimide resin, acrylic resin, epoxy resin, polyacrylamide, polyvinyl alcohol, gelatin, casein, and cellulose can be used. Those mixed with the above, photosensitive resin, oil-in-water (O/W) emulsion (emulsion) type resin composition (for example, one obtained by emulsifying reactive silicone), etc. The thickness of the light shielding portion 20 may be 0.5 μm or more, and may be 10 μm or less, for example.

The substrate 40 is a transparent substrate with light transmittance. For example, transparent glass substrates such as quartz glass, Pyrex (registered trademark) glass, synthetic quartz plates, transparent resin films, optical resin films, etc. can be used. The flexible substrate and so on. Among these, it is preferable to use a glass substrate including an alkali-free glass containing no alkali component in the glass. Specifically, "7059 glass", "1737 glass", "EAGLE 200" and "Yigle XG (EAGLE XG)" manufactured by Corning Corporation, and " AN100", "OA-10G" and "OA-11" manufactured by Nippon Electric Glass Co., Ltd. These are materials with a low thermal expansion coefficient, and have excellent dimensional stability and workability in high-temperature heat treatment.

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

The method of manufacturing the light conversion layer 30 (color filter 100) according to one embodiment includes: a step of forming a light-shielding portion 20 on a substrate 40 (a light-shielding portion forming step); In the pixel portion forming area of, the step of arranging the inkjet ink of the embodiment by the inkjet method (arrangement step); and the step of curing the inkjet ink (hardening step).

In the light-shielding portion forming step, the light-shielding portion 20 is formed in a pattern (for example, a lattice shape). The method of forming the light-shielding portion 20 includes a method of forming a thin film of a metal thin film such as chromium or a resin composition containing light-shielding particles on one surface side of the substrate 40 and patterning the thin film. The metal thin film can be formed by, for example, a sputtering method, a vacuum evaporation method, or the like. The film of the resin composition containing light-shielding particles can be formed, for example, by methods such as coating and printing. As a method of patterning, photolithography and the like can be cited.

In the arranging step, the inkjet ink is selectively arranged (attached) in the pixel portion formation area (the area on the substrate 40 where the light shielding portion 20 is not formed (the opening of the light shielding portion 20)) by the inkjet method. Examples of the inkjet method include a bubble jet (registered trademark) method using an electrothermal converter as an energy generating element, a piezoelectric jet method using a piezoelectric element, and the like.

In the hardening step, the inkjet ink arranged in the arrangement step is hardened by irradiation or heating of active energy rays.

In the case of curing the inkjet by irradiation of active energy rays (for example, ultraviolet rays), as the light source, for example, mercury lamps, metal halide lamps, xenon lamps, light emitting diodes (Light Emitting Diode, LED), etc. can be used. The wavelength of the irradiated light may be 200 nm or more, and may be 440 nm or less, for example. The exposure amount can be 10 mJ/cm ² or more, and can be 4000 mJ/cm ² or less, for example.

In the case of curing the inkjet ink 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.

When the inkjet ink contains a solvent (organic solvent), the manufacturing method of this embodiment may further include a step of volatilizing the solvent (a volatilization step). The volatilization step is performed, for example, between the placement step and the hardening step. In the volatilization step, for example, the inkjet ink is heated to volatilize the solvent. The heating temperature may be 50°C or higher, and may be 150°C or lower, for example. The heating time can be, for example, 1 minute or more or 3 minutes or more, and can be 30 minutes or less.

In the volatilization step, the solvent (organic solvent) may also be volatilized by drying under reduced pressure (drying under reduced pressure). From the viewpoint of controlling the composition of the ink composition, the conditions for drying under reduced pressure can usually be at a pressure of 1.0 Pa to 500 Pa, at 20°C to 30°C, for 3 minutes to 30 minutes.

As mentioned above, although one embodiment of the color filter, the light conversion layer, and the manufacturing method of these was demonstrated, this invention is not limited to the said embodiment.

For example, instead of the third pixel portion 10c or in addition to the third pixel portion 10c, the light conversion layer may also include: a pixel portion (blue) containing a cured product of a light-emitting inkjet ink containing blue light-emitting nanocrystals. Color pixel). Furthermore, the light conversion layer may include a pixel portion (for example, a yellow pixel portion) containing a cured product of a light-emitting inkjet ink containing nanocrystal particles that emit light of colors other than red, green, and blue. In these cases, it is preferable that the light-emitting nanocrystal grains contained in each pixel portion of the light conversion layer each have an absorption maximum wavelength in the same wavelength region.

In addition, at least a part of the pixel portion of the light conversion layer may include a cured product of a composition containing a pigment other than the light-emitting nanocrystal grains.

Furthermore, the color filter may include an ink-repellent layer containing a material having ink repellency and having a width smaller than that of the light-shielding part on the pattern of the light-shielding part. Moreover, instead of providing the ink repellent layer, a photocatalyst-containing layer as a variable wettability layer may be coated on the entire surface including the pixel portion formation area, and then the photocatalyst-containing layer may be interposed through a photomask. Exposure is performed by irradiating light to selectively increase the ink affinity of the pixel portion formation area. As a photocatalyst, titanium oxide, zinc oxide, etc. are mentioned.

Furthermore, the color filter may include an ink receiving layer containing hydroxypropyl cellulose, polyvinyl alcohol, gelatin, etc. between the substrate and the pixel portion.

Also, the color filter may include a protective layer on the pixel portion. The protective layer is provided to flatten the color filter and prevent 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 eluting into the liquid crystal layer. The material constituting the protective layer can be used as a well-known protective layer for color filters.

Furthermore, in addition to the above-mentioned luminescent nanocrystal grains, the pixel portion of the light conversion layer of this embodiment may further contain a pigment of substantially the same color as the luminescent color of the luminescent nanocrystal grain. In order to make the pixel portion contain a pigment, the inkjet ink may contain a pigment.

Furthermore, one or two types of light-emitting pixel portions of the red pixel portion (R), the green pixel portion (G), and the blue pixel portion (B) in the light conversion layer of this embodiment may be formed without The pixel portion of the light-emitting nanocrystal grains containing the color material. As the color material that can be used here, a known color material can be used. For example, as the color material used in the red pixel portion (R), diketopyrrolopyrrole pigments and/or anionic red organic dyes can be cited. The color material used in the green pixel portion (G) may be selected from the group consisting of halogenated copper phthalocyanine pigments, phthalocyanine-based green dyes, phthalocyanine-based blue dyes, and azo-based yellow organic dyes. At least one of. Examples of the color material used for the blue pixel portion (B) include ε-type copper phthalocyanine pigment and/or cationic blue organic dye. Regarding the usage amount of these color materials, when contained in the light conversion layer, from the viewpoint of preventing the decrease in transmittance, based on the total mass of the pixel portion (cured material of inkjet ink), it is preferably 1 Mass%～5 mass%. Example

Hereinafter, the present invention will be described in detail with examples. However, the present invention is not limited to the following examples. In addition, the materials used in the examples all used those obtained by introducing argon gas and replacing dissolved oxygen with argon gas. Regarding titanium oxide, before mixing, under a reduced pressure of 1 mmHg, heating at 175°C for 4 hours, and cooling in an argon atmosphere. The liquid material used in the examples was used after dehydration with molecular sieve 3A for 48 hours or more before mixing.

[Preparation of organic ligands for InP/ZnSeS/ZnS nanocrystals] Put polyethylene glycol|average Mn400| (|average Mn400|) (manufactured by Sigma-Aldrich) into the flask After that, while stirring in a nitrogen atmosphere, succinic anhydride (manufactured by Sigma-Aldrich) was added in molar amounts equal to polyethylene glycol |average Mn400|. The internal temperature of the flask was raised to 80°C and stirred for 8 hours to obtain the organic ligand 1 represented by the following formula (A-1) as a pale yellow viscous oily substance. [化9]

After putting polyethylene glycol |average Mn750| (manufactured by Sigma-Aldrich) into the flask, while stirring in a nitrogen atmosphere, add polyethylene glycol |average Mn750| and other mol The amount of succinic anhydride (manufactured by Sigma-Aldrich). The internal temperature of the flask was increased to 80°C and stirred for 8 hours to obtain the organic ligand 2 represented by the following formula (A-2) as a pale yellow viscous oily substance. [化10]

With reference to Japanese Patent Laid-Open No. 2002-121549, organic ligand 3 (triethylene glycol monomethyl ether of 3-mercaptopropionic acid (triethylene glycol monomethyl ether) represented by the following formula (A-3) was synthesized Methyl ether mercaptopropionate, TEGMEMP)). [化11]

After putting JEFAMINE M-1000 (manufactured by Huntsman) into the flask, while stirring in a nitrogen atmosphere, add a molar amount such as JEFAMINE M-1000 to it Succinic anhydride (manufactured by Sigma-Aldrich). The internal temperature of the flask was raised to 80° C. and stirred for 8 hours to obtain a comparative ligand 1 represented by the following formula (B) as a pale yellow viscous oily substance. [化12]

By GPC measurement using HLC-8320 manufactured by Tosoh, the weight average molecular weight (Mw) of the ligand in terms of polystyrene was measured. As a result, the Mw of the organic ligand 1 was 597, and the organic ligand 1 The Mw of position 2 is 906, the Mw of organic ligand 3 is 273, and the Mw of ligand 1 for the comparative example is 1191.

＜Preparation of red luminescent InP/ZnSeS/ZnS nanocrystalline particle dispersion＞ [Preparation of indium laurate solution] 10 g of 1-octadecene (ODE), 146 mg (0.5 mmol) of indium acetate, and 300 mg (1.5 mmol) of lauric acid were added to the reaction flask to obtain a mixture. The mixture was heated at 140° C. for 2 hours under vacuum, thereby obtaining a transparent solution (indium laurate solution). The solution was maintained in the glove box at room temperature until needed. In addition, since indium laurate has low solubility at room temperature and is easy to precipitate, when using an indium laurate solution, heat the precipitated indium laurate in the solution (ODE mixture) to about 90°C to form a transparent solution. , Measure the required amount to use.

[Preparation of the nucleus (InP nucleus) of red luminescent nanocrystals] 5 g of trioctyl phosphine oxide (TOPO), 1.46 g (5 mmol) of indium acetate and 3.16 g (15.8 mmol) of lauric acid were added to the reaction flask , Get a mixture. After heating the mixture at 160°C for 40 minutes under a nitrogen (N ₂ ) environment, it was heated at 250°C for 20 minutes under vacuum. Next, the reaction temperature (temperature of the mixture) was increased to 300°C in a nitrogen (N ₂ ) environment. At this temperature, a mixture of 3 g of 1-octadecene (ODE) and 0.25 g (1 mmol) of tris(trimethylsilyl)phosphine was quickly introduced into the reaction flask, and the reaction temperature was maintained at 260°C. After 5 minutes, the reaction was stopped by removing the heater, and the obtained reaction solution was cooled to room temperature. Next, 8 ml of toluene and 20 ml of ethanol were added to the reaction solution in the glove box. After centrifugal separation, the InP nanocrystals are precipitated, and then the InP nanocrystals are obtained by decantation of the supernatant. Next, the obtained InP nanocrystal grains were dispersed in hexane. Thereby, a dispersion liquid (hexane dispersion liquid) containing 5 mass% of InP nanocrystal grains was obtained.

The hexane dispersion liquid of the obtained InP nano crystal grains and the indium laurate solution are charged into the reaction flask to obtain a mixture. The hexane dispersion of InP nanocrystals and the indium laurate solution were adjusted to 0.5 g (25 mg for InP nanocrystals) and 5 g (178 mg for indium laurate), respectively. After the mixture was allowed to stand at room temperature for 10 minutes under vacuum, the inside of the flask was returned to normal pressure with nitrogen, the temperature of the mixture was increased to 230°C, and the temperature was maintained for 2 hours to remove hexane from the inside of the flask. Next, the internal temperature of the flask was increased to 250°C, a mixture of 3 g of 1-octadecene (ODE) and 0.03 g (0.125 mmol) of tris(trimethylsilyl)phosphine was quickly introduced into the reaction flask, and the reaction temperature Maintain at 230°C. After 5 minutes, the reaction was stopped by removing the heater, and the obtained reaction solution was cooled to room temperature. Next, 8 ml of toluene and 20 ml of ethanol were added to the reaction solution in the glove box. Then centrifugal separation was performed to precipitate the InP nanocrystal grains (InP core) that became the core of the red luminescent InP/ZnSeS/ZnS nanocrystal grains, and then the supernatant was decanted to obtain InP nanocrystal grains ( InP core). Next, the obtained InP nanocrystal grains (InP core) were dispersed in hexane to obtain a dispersion liquid (hexane dispersion liquid) containing 5 mass% of InP nanocrystal grains (InP core).

[Formation of the shell (ZnSeS/ZnS shell) of red luminescent nanocrystalline grains] After adding 2.5 g of the hexane dispersion of InP nanocrystals (InP core) obtained as described above in the reaction flask, at room temperature, add 0.7 g of oleic acid to the reaction flask, and increase the temperature to 80°C for 2 hour. Next, 14 mg of diethyl zinc, 8 mg of bis(trimethylsilyl) selenide, and 7 mg of hexamethyldisilathiane (Hexamethyldisilathiane) (ZnSeS) dissolved in 1 ml of ODE were added dropwise to the reaction mixture. Precursor solution), the temperature was raised to 200°C and kept for 10 minutes, thereby forming a monolayer ZnSeS shell with a thickness of 0.5.

Next, the temperature was increased to 140°C and maintained for 30 minutes. Next, a ZnS precursor solution obtained by dissolving 69 mg of diethyl zinc and 66 mg of hexamethyldisilane in 2 ml of ODE was added dropwise to the reaction mixture, and the temperature was increased to 200°C for 30 minutes. Thus, a ZnS shell with a thickness of 2 single layers was formed. After dropping the ZnS precursor solution for 10 minutes, the reaction was stopped by removing the heater. Next, the reaction mixture was cooled to room temperature, and the obtained white precipitate was removed by centrifugal separation, thereby obtaining a transparent nanocrystalline particle dispersion (InP) in which red luminescent InP/ZnSeS/ZnS nanocrystalline particles were dispersed. /ZnSeS/ZnS nano crystal grain ODE dispersion).

<Preparation of green luminescent InP/ZnSeS/ZnS nanocrystalline particle dispersion> [Synthesis of green luminescent nanocrystalline core (InP core)] Add trioctyl phosphine oxide (TOPO) 5 to the reaction flask g, 1.46 g (5 mmol) of indium acetate and 3.16 g (15.8 mmol) of lauric acid to obtain a mixture. After heating the mixture at 160°C for 40 minutes under a nitrogen (N ₂ ) environment, it was heated at 250°C for 20 minutes under vacuum. Next, the reaction temperature (temperature of the mixture) was increased to 300°C in a nitrogen (N ₂ ) environment. At this temperature, a mixture of 3 g of 1-octadecene (ODE) and 0.25 g (1 mmol) of tris(trimethylsilyl)phosphine was quickly introduced into the reaction flask, and the reaction temperature was maintained at 260°C. After 5 minutes, the reaction was stopped by removing the heater, and the obtained reaction solution was cooled to room temperature. Next, 8 ml of toluene and 20 ml of ethanol were added to the reaction solution in the glove box. After centrifugal separation, the InP nanocrystalline particles (InP core) are precipitated, and the InP nanocrystalline particles (InP core) are obtained by decantation of the supernatant. Next, the obtained InP nanocrystal grains (InP core) were dispersed in hexane to obtain a dispersion liquid (hexane dispersion liquid) containing 5 mass% of InP nanocrystal grains (InP core).

[Synthesis of the shell (ZnSeS/ZnS shell) of green luminescent nano grains] After adding 2.5 g of the obtained hexane dispersion of InP nanocrystal particles (InP core) to the reaction flask, at room temperature, 0.7 g of oleic acid was added to the reaction flask, and the temperature was increased to 80°C. Next, 14 mg of diethyl zinc, 8 mg of bis(trimethylsilyl) selenide, and 7 mg of hexamethyldisilsulfane (ZnSeS precursor solution) dissolved in 1 ml of ODE were added dropwise to the reaction mixture. ), thereby forming a single-layer ZnSeS shell with a thickness of 0.5.

After dropping the ZnSeS precursor solution, the reaction temperature was kept at 80°C for 10 minutes. Next, the temperature was increased to 140°C and maintained for 30 minutes. Next, a ZnS precursor solution obtained by dissolving 69 mg of diethyl zinc and 66 mg of hexamethyldisilsulfane in 2 ml of ODE was added dropwise to the reaction mixture, thereby forming a single layer of ZnS with a thickness of 2 shell. After dropping the ZnS precursor solution for 10 minutes, the reaction was stopped by removing the heater. Next, the reaction mixture was cooled to room temperature, and the obtained white precipitate was removed by centrifugation, thereby obtaining a transparent nanocrystalline particle dispersion (ODE) in which green light-emitting InP/ZnSeS/ZnS nanocrystalline particles were dispersed. Dispersions).

[Production of green luminescent nano-grain dispersion 1 (InP/ZnSeS/ZnS nano-grain dispersion) based on ligand exchange] For the obtained green light-emitting nanocrystalline particle dispersion (InP/ZnSeS/ZnS nanocrystalline ODE dispersion), add 2 times the amount of PGMEA (propylene glycol monomethyl ether) to temporarily aggregate the nanocrystalline particles Then, add 100 parts by mass to the total content of the luminescent nanocrystal grains in the dispersion and the ligand during synthesis (solid content in the ODE dispersion), which is 20 parts by mass of the organic ligand 1 Then, stirring was carried out at 80°C for 2 hours, thereby performing ligand exchange. Before the ligand exchange, the agglomerated nanocrystals are dispersed again at the same time as the ligand exchange. Next, to the nanocrystalline particle dispersion after the ligand exchange, 4 times the amount of heptane was added to re-aggregate the nanocrystalline particles, and after centrifugation to precipitate them, the supernatant Decanting and drying under vacuum to obtain nano grains (InP/ZnSeS/ZnS nano grains modified with the organic ligand).

By using TG/DTA6200 manufactured by Hitachi High-Tech Science to measure the weight loss of the dried nanocrystalline grains at 150℃～500℃, the organic coordination in the luminescent nanocrystalline grains was calculated. The volume ratio (the content of the organic ligand relative to 100 parts by mass of the total content of the luminescent nanocrystal grains and the organic ligand) was 26 parts by mass.

Disperse the obtained nanocrystal grains (InP/ZnSeS/ZnS nanocrystal grains modified with the organic ligand) in 1,6-hexanediol diacrylate (New Nakamura Chemical Industry Co., Ltd. Manufacture, trade name: NK ester A-HD-N, hereinafter also referred to as "HDDA"), to obtain green light-emitting nanocrystalline particle dispersion 1. The total content of the luminescent nanocrystal particles and the organic ligand in the green luminescent nanocrystal particle dispersion is 50% by mass.

[Production of InP/ZnSeS/ZnS nano-grain dispersion 2～InP/ZnSeS/ZnS nano-grain dispersion 5 based on ligand exchange] By dispersing with the InP/ZnSeS/ZnS nano-grains In the same manner as in body 1, the types of organic ligands used and the ratio of organic ligands were adjusted as shown in Table 1 to obtain luminescent nanocrystalline particle dispersion 2 to luminescent nanocrystalline particle dispersion 5. The addition amount of 100 parts by mass of the organic ligand relative to the total content of the luminescent nanocrystal grains and the ligand during synthesis during the ligand exchange is 50 parts by mass in the luminescent nanocrystal particle dispersion 2. 30 parts by mass in the luminescent nanocrystal particle dispersion 3, 20 parts by mass in the luminescent nanocrystal particle dispersion 4, and 30 parts by mass in the luminescent nanocrystal particle dispersion 5. It is 30 parts by mass in the luminescent nanocrystalline particle dispersion 6 and 30 parts by mass in the luminescent nanocrystalline particle dispersion 7. [Table 1] Luminescent Nanoparticle Dispersion colour Types of organic ligands Organic ligand weight average molecular weight (Mw) Organic ligand ratio (parts by mass) 1 green Organic ligand 1 597 26 2 green Organic ligand 1 597 35 3 red Organic ligand 1 597 25 4 red Organic ligand 1 597 17 5 green Comparison ligand 1 1191 32 6 red Organic Ligand 2 906 28 7 red Organic ligand 3 273 26

<Preparation of light-scattering particle dispersion> In a container filled with argon gas, mix 27.5 g of titanium oxide (trade name: CR-60-2, manufactured by Ishihara Sangyo Co., Ltd., average particle size (volume average diameter): 210 nm), and polymer dispersant (trade name) : Ajisper PB-821, 1.0 g of Ajinomoto Fine-Techno (manufactured by Ajinomoto Fine-Techno), and 21.5 g of HDDA as a light-scattering particle dispersion medium, in the obtained mixture Zirconia beads (diameter: 1.25 mm) were added, and the mixture was shaken with a paint conditioner for 2 hours to disperse the mixture, and a polyester mesh filter was used to remove the zirconia beads, thereby obtaining a light-scattering particle dispersion 1 ( Titanium oxide content: 55 mass%).

[Preparation of inkjet ink] <Example 1> 7.0 g of luminescent nanocrystal particle dispersion 1, 0.9 g of light scattering particle dispersion 1, 0.3 g of photopolymerization initiator (phenyl(2,4,6-trimethylbenzyl-diphenyl) Base)-phosphine oxide (manufactured by IGM resin (IGM resin) company, trade name: Omnirad (Omnirad) TPO)), 0.3 g antioxidant Adekastab (Adekastab) C and 1.5 g HDDA in an argon filled After uniformly mixing in the container, filter the mixture with a 5 μm filter in the glove box. Furthermore, argon gas was introduced into the container in which the obtained filtrate was put, and the inside of the container was saturated with argon gas. Next, the pressure was reduced to remove the argon gas, whereby the inkjet ink of Example 1 was obtained. The total content of luminescent nanocrystal particles, organic ligands, photopolymerizable compounds, and light-scattering particles in the inkjet ink based on the total mass of the inkjet ink (non-volatile component concentration) and relative The total content of the luminescent nanocrystalline particles, organic ligands, photopolymerizable compounds, and light-scattering particles in the ink is shown in the table below for 100 parts by mass of the luminescent nanocrystalline particles and organic ligands. 2 shown.

<Example 2 to Example 5, Comparative Example 1 to Comparative Example 2, Reference Example 1 to Reference Example 2> Based on the total mass of the inkjet ink, the total content (non-volatile content concentration) of the luminescent nanocrystal particles, organic ligands, photopolymerizable compounds, and light scattering particles in the inkjet ink, and relative The total content of luminescent nanocrystalline particles, organic ligands, photopolymerizable compounds, and light-scattering particles in inkjet ink is adjusted for the total content of luminescent nanocrystalline particles and organic ligands per 100 parts by mass For the amounts shown in Table 2, inkjet inks of Example 2 to Example 5, Comparative Example 1 to Comparative Example 2, and Reference Example 1 to Reference Example 2 were obtained. Regarding Reference Example 2, diethylene glycol diethyl ether was used as a solvent to adjust so that the total content of luminescent nanocrystal particles, organic ligands, photopolymerizable compounds, and light scattering particles in the inkjet ink was 25 mass %.

[Evaluation of the viscosity of inkjet ink and its increase in atmospheric gas environment] The evaluation of the viscosity of the inkjet inks of the Examples and Comparative Examples was carried out by measuring the viscosity at 40°C using an E-type viscometer. In the evaluation of viscosity, when the viscosity at 40°C is 17.0 mPa･s or less, it is evaluated as having a viscosity suitable for the formation of the pixel portion, and when the viscosity at 40°C exceeds 17.0 mPa･s, it is evaluated as having a viscosity suitable for the pixel. The viscosity of the formation.

The evaluation of the thickening under the atmospheric gas environment (the thickening under atmospheric exposure) was performed by dropping the inkjet inks of the Examples and Comparative Examples into a petri dish, and then tilting the petri dish after 3 minutes. When the petri dish was tilted, it was evaluated that there was no thickening when it flowed without problems, and it was evaluated that there was thickening when it did not flow, or even if a part of it changed to a gel state. The evaluation of thickening is carried out in a clean room with a constant humidity (humidity 50±2%RH).

[Evaluation of Optical Properties] [Preparation of Samples for Evaluation] Each inkjet ink was coated on a glass substrate in the air with a spin coater so that the film thickness would be 10 μm. In a nitrogen atmosphere, a UV irradiation device using an LED lamp with a dominant wavelength of 395 nm is used to irradiate the coating film with UV so that the cumulative light amount reaches 1500 mJ/cm ² to harden it, and form an inkjet on the glass substrate. A layer of hardened ink (light conversion layer). In this way, a substrate having a light conversion layer, that is, each sample for evaluation, was produced.

[External Quantum Efficiency (EQE) Evaluation] As the surface light source, a blue LED (peak emission wavelength: 450 nm) manufactured by CCS Co., Ltd. was used. The measuring device is a radiation spectrophotometer manufactured by Otsuka Electronics Co., Ltd. (trade name "MCPD-9800") connected to an integrating sphere, and an integrating sphere is installed above the blue LED. The prepared evaluation sample was inserted between the blue LED and the integrating sphere, and the spectrum observed by lighting the blue LED and the illuminance at each wavelength were measured.

Based on the spectrum and illuminance measured by the measuring device, the external quantum efficiency is determined as follows. The external quantum efficiency is a value indicating how much of the light (photons) incident on the light conversion layer is radiated to the observer side as fluorescence. Therefore, the larger the value, the better the light-emitting characteristics of the light conversion layer, which is an important evaluation index. EQE(%)=P1(green)/E(blue)×100

Here, E (blue) and P1 (green) respectively indicate the following. E (blue): Represents the total value of "illuminance × wavelength ÷ hc" in the wavelength region of 380 nm to 490 nm. P1 (green): Represents the total value of "illuminance × wavelength ÷ hc" in the wavelength region of 500 nm to 650 nm. These are values equivalent to the number of observed photons. In addition, h represents Planck's constant, and c represents the speed of light.

[Production of light conversion layer based on inkjet method] After sputtering metallic chromium on a glass substrate containing alkali-free glass ("OA-10G" manufactured by Nippon Electric Glass Co., Ltd.), the pattern is formed by photolithography, and then photoresist SU-8 ( (Manufactured by Nippon Kayaku Co., Ltd.), exposure, development, and post-baking are performed to form the SU-8 pattern on the chrome pattern. The design of the partition wall pattern thus produced is a pattern having an opening portion corresponding to a sub-pixel of 100 μm×300 μm, with a line width of 20 μm and a thickness of 10 μm.

Using an inkjet printer (manufactured by FUJIFILM Dimatix, trade name "DMP-2850"), set the nozzle temperature to 40°C to eject the inkjet ink to the partition wall The opening of the pattern. Regarding the composition other than the reference example 2, after spraying once, in a nitrogen atmosphere, use a UV irradiation device as a LED lamp with a dominant wavelength of 395 nm to cure at a cumulative light intensity of 1500 mJ/cm ² to produce a thickness of 10 μm The light conversion layer.

After the composition of Reference Example 2 was ejected to the opening of the partition wall, the solvent was removed by reducing the pressure, and the inkjet ink was ejected again into the partition wall pattern by inkjet from thereon. This was repeated 5 times to produce a 10 μm thick light conversion layer.

Table 2 shows the results of each of the above evaluations and the number of ejections of ink jets during the production of the light conversion layer. In addition, in Table 2, the content X represents the total content of luminescent nanocrystal particles, organic ligands, photopolymerizable compounds, and light scattering particles based on the total mass of the inkjet ink, and the content Y represents the relative The total content of luminescent nanocrystalline grains, organic ligands, photopolymerizable compounds, and light-scattering particles is the total content of luminescent nanocrystalline grains and organic ligands for 100 parts by mass. [Table 2] Ink blending Evaluation results Luminous Nanoparticle Dispersion Content X (mass%) Content Y (parts by mass) Viscosity (mPa･s) Atmospheric stability EQE (%) Number of ejections Example 1 1 94 37 13 No viscosity increase 35.00 1 Example 2 2 94 37 14.6 No viscosity increase 33.80 1 Example 3 3 94 37 11.9 No viscosity increase 37.59 1 Example 4 6 94 37 13.2 No viscosity increase 38.02 1 Example 5 7 94 37 10.2 No viscosity increase 37.13 1 Comparative example 1 4 94 37 - With viscosity increase - - Comparative example 2 5 94 37 18.2 - - - Reference example 1 1 94 10.6 - - 17.30 - Reference example 2 1 25 9.3 - - - 5

10: Pixel 10a: The first pixel 10b: second pixel part 10c: third pixel part 11a: The first luminescent nano grain 11b: Second luminescent nanocrystalline grain 12a: first light scattering particle 12b: Second light scattering particles 12c: third light scattering particle 13a: The first hardening component 13b: Second hardening component 13c: third hardening component 20: Shading part 30: Light conversion layer 40: Substrate 100: color filter

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

10: Pixel

10a: The first pixel

10b: second pixel part

10c: third pixel part

11a: The first luminescent nano grain

11b: Second luminescent nanocrystalline grain

12a: first light scattering particle

12b: Second light scattering particles

12c: third light scattering particle

13a: The first hardening component

13b: Second hardening component

13c: third hardening component

20: Shading part

30: Light conversion layer

40: Substrate

100: color filter

Claims (7)

An inkjet ink for color filters, containing luminescent nanocrystalline particles, photopolymerizable compounds and/or thermosetting resins, and light scattering particles, wherein: The luminescent nanocrystal grains have organic ligands on their surfaces, The total content of the luminescent nanocrystal particles, the organic ligand, the photopolymerizable compound, the thermosetting resin, and the light scattering particles is based on the total mass of the inkjet ink , Is 41% by mass or more, The total content of the light-emitting nanocrystal grains and the organic ligand is relative to the light-emitting nanocrystal grain, the organic ligand, the photopolymerizable compound, the thermosetting resin, and The total content of 100 parts by mass of the light-scattering particles is 21 parts by mass or more, The content of the organic ligand is 20 parts by mass or more relative to 100 parts by mass of the total content of the luminescent nanocrystal grains and the organic ligand, The weight average molecular weight of the organic ligand is 1000 or less. The inkjet ink for a color filter according to claim 1, wherein the luminescent nanocrystal particles, the organic ligand, the photopolymerizable compound, the thermosetting resin, and the light The total content of the scattering particles is 70% by mass or more based on the total mass of the inkjet ink. The inkjet ink for a color filter according to claim 1 or 2, wherein the organic ligand contains a polyoxyalkylene group. A light conversion layer includes a plurality of pixel portions and a light shielding portion arranged between the plurality of pixel portions, The plurality of pixel portions have a light-emitting pixel portion including a cured product of the inkjet ink for a color filter according to any one of Claims 1 to 3. The light conversion layer according to claim 4, wherein the light-emitting pixel portion includes: The first luminescent pixel portion contains luminescent nanocrystal particles that absorb light with a wavelength in the range of 420 nm to 480 nm and emit light with a peak emission wavelength in the range of 605 nm to 665 nm; and The second light-emitting pixel portion includes light-emitting nanocrystal particles that absorb light having a wavelength in the range of 420 nm to 480 nm and emit light having a light emission peak wavelength in the range of 500 nm to 560 nm. The light conversion layer according to claim 4 or claim 5, which further includes a non-luminous pixel portion containing light-scattering particles. A color filter, comprising the light conversion layer according to any one of claim 4 to claim 6.

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