Photoconversion ink composition, photoconversion multilayer substrate and photoconversion pixel substrate manufactured using the same

Abstract

To provide a light conversion ink composition excellent in light conversion properties, lightfastness and coating film hardness, and also excellent in discharge continuity and discharge stability in an inkjet process.SOLUTION: The invention provides: a light conversion ink composition containing luminescent particles, a polymerizable monomer, and an additive of a specific structure; a light conversion laminate substrate manufactured using the light conversion ink composition, and a backlight unit comprising the same; a light conversion pixel substrate manufactured using the light conversion ink composition; and an image display device comprising the backlight unit or light conversion pixel substrate.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a photoconversion ink composition; a photoconversion laminated substrate manufactured using the photoconversion ink composition and a backlight unit including the same; a photoconversion pixel substrate manufactured using the photoconversion ink composition; and an image display device including the backlight unit or the photoconversion pixel substrate. [Background technology]

[0002] With the development of the information society, the demand for display devices for displaying images has increased in various forms, and in recent years, various display devices such as liquid crystal displays (LCDs), plasma display panels (PDPs), and organic light-emitting diode display devices (OLEDs) have been utilized.

[0003] Color reproduction accuracy is one of the most important factors in display devices. Recently, as one example of a strategy to improve the color reproduction accuracy of display devices, blue LEDs are being used instead of conventional white LEDs, and display devices equipped with a photo-converting multilayer substrate containing quantum dots, which are another light conversion means, are being used. For example, by applying a photo-converting multilayer substrate or photo-converting pixel substrate containing a photo-converting layer in which quantum dots are dispersed to a color filter that includes a backlight or pixels using blue LED chips, the color reproduction accuracy of the display device is being improved by increasing the light conversion efficiency.

[0004] On the other hand, to manufacture color filters to which light-converting pixels are applied, a photolithography method using a composition containing light-emitting particles such as quantum dots can be used. However, although such a method is superior in terms of the sophistication and reproducibility of the color filter, it requires separate processes of coating, exposure, development, and curing for each color to form the pixels, which increases the manufacturing process, time, and cost, and makes it difficult to control the yield due to the large number of control factors between processes.

[0005] To solve these problems, the inkjet method was proposed. The inkjet method is a technology that uses an inkjet head to spray liquid ink into designated areas, thereby creating an image with each ink colored. It can color multiple colors, including red, green, and blue, at once, and can significantly reduce manufacturing processes, time, and costs.

[0006] In this regard, Korean Patent Publication No. 10-2019-0119457 discloses quantum dots that can be used in photoconversion ink compositions, comprising a core containing Ag, In, Ga, and S, and a ZnS shell. However, photoconversion ink compositions containing these quantum dots have poor ejection continuity and ejection stability, and the coatings produced therein have poor photoconversion efficiency, blue light absorbance, lightfastness, and coating hardness, resulting in a decrease in optical properties. Furthermore, there is a problem of reduced optical properties due to the aggregation phenomenon of scattering particles.

[0007] Therefore, there is a need for the development of a photoconversion ink composition that exhibits excellent photoconversion efficiency, lightfastness, blue light absorbance, and coating hardness, and that can form photoconversion laminated substrates and photoconversion pixel substrates that do not experience aggregation of scattered particles, and that also exhibits excellent ejection continuity and ejection stability. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Republic of Korea Patent Publication No. 10-2019-0119457 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The present invention aims to improve upon the problems of the prior art described above, and provides a photoconversion ink composition that is excellent in photoconversion characteristics, light resistance and coating hardness, and excellent in ejection continuity and ejection stability in the inkjet process.

[0010] Furthermore, the object of the present invention is to provide an optical conversion laminated substrate and an optical conversion pixel substrate manufactured using the optical conversion ink composition; a backlight unit including the optical conversion laminated substrate; and an image display device including the backlight unit or the optical conversion pixel substrate.

[0011] However, the problems that this application seeks to solve are not limited to those mentioned above, and other problems not mentioned will be clearly understood by an ordinary engineer from the following description. [Means for solving the problem]

[0012] To achieve the above objective, the present invention provides a photoconversion ink composition comprising luminescent particles, polymerizable monomers, and additives, wherein the additives comprise one or more selected from the following chemical formulas 1 to 4: [Chemical formula 1] TIFF0007884464000001.tif23114

[0013] In the above chemical formula 1, R 11 R is a hydrogen or methyl group; 12 R is a direct bond or an alkylene group having 1 to 30 carbon atoms; 13 n1 is an alkylene group having 1 to 30 carbon atoms, an alkenylene group having 2 to 30 carbon atoms, a cycloalkylene group having 3 to 30 carbon atoms, a heterocycloalkylene group having 3 to 30 carbon atoms, an alkylene oxy group having 1 to 30 carbon atoms, an alkylene ester group having 2 to 31 carbon atoms, an arylene group having 5 to 30 carbon atoms, or an arylalkylene group having 6 to 30 carbon atoms; n1 is an integer from 0 to 100, and when n1 is 0, it is directly bonded.

[0014] [Chemical formula 2] TIFF0007884464000002.tif27114

[0015] In the chemical formula 2, R 21 and R 22 are each independently a divalent to tetravalent hydrocarbon group having 1 to 10 carbon atoms; R 23 to R 26 are each independently hydrogen, a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, a thiol group, or TIFF0007884464000003.tif10114

[0016] and R 27 is a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms; n2 is an integer of 1 to 5, and when n2 is 2 or more, a plurality of R 22 , R 25 and R 26 may each independently be different from each other.

[0017] [Chemical formula 3] TIFF0007884464000004.tif48114

[0018] In the chemical formula 3, R 28 and R 29 are each independently hydrogen or a methyl group; m2 is an integer of 1 to 3, and when m2 is 2 or more, a plurality of R 29 may be different from each other.

[0019] [Chemical formula 4] TIFF0007884464000005.tif28148

[0020] In the chemical formula 4, R 41 is hydrogen or a methyl group, X4 is O or -NH-, R 43 is a direct bond or an alkylene group having 1 to 10 carbon atoms, R 44 and R 45Each of these is independently hydrogen, an alkyl group having 1 to 20 carbon atoms, an allyl group, or a cycloalkyl group, and R 42 These are substituted or unsubstituted alkylene groups, arylene groups, alkylarylene groups, and alkyl arylene groups having 1 to 20 carbon atoms. TIFF0007884464000006.tif18148

[0021] And at this time, R 46 , R 48 , R 49 , R 410 , R 411 , R 413 and R 414 Each of these is independently a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, and R 47 and R 412 Each of these is independently a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, and l4, m4, and n4 are integers from 1 to 3.

[0022] Furthermore, the present invention provides a photoconverting laminated substrate manufactured using the photoconverting ink composition and a backlight unit containing the same.

[0023] Furthermore, the present invention provides a light-converting pixel substrate manufactured using the light-converting ink composition.

[0024] Furthermore, the present invention provides an image display device including the backlight unit or the light conversion pixel substrate. [Effects of the Invention]

[0025] The light-converting ink composition according to the present invention exhibits improved light-converting properties compared to conventional light-converting ink compositions.

[0026] Furthermore, the light-converting ink composition according to the present invention exhibits improved blue light absorbance compared to conventional light-converting ink compositions.

[0027] Furthermore, the light-converting ink composition according to the present invention exhibits improved coating film hardness compared to conventional light-converting ink compositions.

[0028] Furthermore, the light-converting ink composition according to the present invention exhibits improved lightfastness compared to conventional light-converting ink compositions.

[0029] Furthermore, the light-converting ink composition according to the present invention offers improved ejection continuity and ejection stability in the inkjet process compared to conventional light-converting ink compositions. [Modes for carrying out the invention]

[0030] The present invention relates to a photoconversion ink composition that is excellent in photoconversion efficiency, lightfastness, blue light absorbance, coating hardness, and ejection continuity and ejection stability by comprising light-emitting particles, polymerizable monomers, and compounds represented by specific chemical formulas as additives; a photoconversion laminated substrate manufactured using the photoconversion ink composition and a backlight unit containing the same; a photoconversion pixel substrate manufactured using the photoconversion ink composition; and an image display device including the backlight unit or the photoconversion pixel substrate.

[0031] Specifically, the light-converting ink composition of the present invention, by including light-emitting particles, polymerizable monomers, and additives containing compounds of a specific structure, improves absorption to a blue light source, thereby improving light conversion efficiency, improving ejection continuity and ejection stability in the inkjet process, and enabling the manufacture of a light-converting laminated substrate or light-converting pixel substrate with excellent light resistance and coating hardness.

[0032] [Chemical formula 1] TIFF0007884464000007.tif23114

[0033] In the above chemical formula 1, R 11 R is a hydrogen or methyl group; 12 R is a direct bond or an alkylene group having 1 to 30 carbon atoms; 13n1 is an alkylene group having 1 to 30 carbon atoms, an alkenylene group having 2 to 30 carbon atoms, a cycloalkylene group having 3 to 30 carbon atoms, a heterocycloalkylene group having 3 to 30 carbon atoms, an alkylene oxy group having 1 to 30 carbon atoms, an alkylene ester group having 2 to 31 carbon atoms, an arylene group having 5 to 30 carbon atoms, or an arylalkylene group having 6 to 30 carbon atoms; n1 is an integer from 0 to 100, and when n1 is 0, it is directly bonded.

[0034] [Chemical formula 2] TIFF0007884464000008.tif27114

[0035] In the above chemical formula 2, R 21 and R 22 Each of these is independently a divalent to tetravalent hydrocarbon group having 1 to 10 carbon atoms; R 23 ~R 26 Each of these independently consists of hydrogen, a substituted or unsubstituted C1-C5 alkyl group, a thiol group, or TIFF0007884464000009.tif10114

[0036] And R 27 R is a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms; n2 is an integer from 1 to 5, and if n2 is 2 or greater, multiple R 22 , R 25 and R 26 These elements may be independent of each other and may be different from one another.

[0037] [Chemical formula 3] TIFF0007884464000010.tif48114

[0038] In the above chemical formula 3, R 28 and R 29 Each is independently either a hydrogen or a methyl group; m2 is an integer from 1 to 3, and if m2 is 2 or greater, there are multiple R 29 They may be different from one another.

[0039] [Chemical formula 4] TIFF0007884464000011.tif28148

[0040] In the above chemical formula 4, R 41 is a hydrogen or methyl group, X4 is O or -NH-, and R 43 R is a direct bond or an alkylene group having 1 to 10 carbon atoms. 44 and R 45 Each of these is independently hydrogen, an alkyl group having 1 to 20 carbon atoms, an allyl group, or a cycloalkyl group, and R 42 These are substituted or unsubstituted alkylene groups, arylene groups, alkylarylene groups, and alkyl arylene groups having 1 to 20 carbon atoms. TIFF0007884464000012.tif18148

[0041] And at this time, R 46 , R 48 , R 49 , R 410 , R 411 , R 413 and R 414 Each of these is independently a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, and R 47 and R 412 Each of these is independently a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, and l4, m4, and n4 are integers from 1 to 3.

[0042] The present invention will be described in detail below. <Photo-converting ink composition> The photoconversion ink composition of the present invention comprises luminescent particles, polymerizable monomers, and compounds represented by chemical formulas 1 to 4, and may optionally further contain one or more of the compounds represented by chemical formula 6, scattering particles, photopolymerization initiators, additives, and solvents.

[0043] Luminous particles Luminescent particles can, for example, absorb light of a predetermined wavelength and then emit light of a different wavelength than the one absorbed. Luminescent nanocrystalline particles may be red luminescent particles that emit light (red light) having an emission peak wavelength in the range of 605 to 665 nm, green luminescent particles that emit light (green light) having an emission peak wavelength in the range of 500 to 600 nm, or blue luminescent particles that emit light (blue light) having an emission peak wavelength in the range of 420 to 480 nm. The light-converting ink composition of the present invention preferably contains at least one of the above luminescent particles.

[0044] In the present invention, the light-emitting particles include semiconductor materials, such as quantum dots.

[0045] In one embodiment of the present invention, the quantum dot has a core-shell structure including a core and a shell covering at least a portion of the core.

[0046] The quantum dots are not particularly limited as long as they are quantum dot particles that can emit light in response to light or electrical stimulation. For example, they may be selected from the group consisting of group II-VI semiconductor compounds; group III-V semiconductor compounds; group IV-VI semiconductor compounds; group IV elements or compounds containing them; and combinations thereof, and these can be used individually or in combination of two or more.

[0047] For example, the II-VI semiconductor compound is a dielemental compound selected from the group consisting of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, and mixtures thereof; CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHg A tri-element compound selected from the group consisting of Te, HgZnS, HgZnSe, HgZnTe, and mixtures thereof; or a tetra-element compound selected from the group consisting of CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and mixtures thereof, may be selected, but is not limited to these.

[0048] The aforementioned III-V group semiconductor compound may be selected from, but is not limited to, a group consisting of two elemental compounds selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; three elemental compounds selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, and mixtures thereof; and four elemental compounds selected from the group consisting of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof.

[0049] The aforementioned IV-VI group semiconductor compound may be, but is not limited to, one or more compounds selected from the group consisting of: a dielemental compound selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof; a trielemental compound selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof; and a tetraelemental compound selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof.

[0050] The Group IV elements or compounds containing them may be selected from the group consisting of Si, Ge, and mixtures thereof; and from the group consisting of two-element compounds selected from the group consisting of SiC, SiGe, and mixtures thereof.

[0051] A quantum dot may be a homogeneous single structure; a dual structure such as a core-shell structure or a gradient structure; or a mixture thereof; and in this invention, the type of quantum dot is not particularly limited as long as it is capable of emitting light upon stimulation with light.

[0052] According to one embodiment, the quantum dot has a core-shell structure, the core comprises one or more selected from the group consisting of InP, InZnP, InGaP, CdSe, CdS, CdTe, ZnS, ZnSe, ZnTe, CdSeTe, CdZnS, CdSeS, PbSe, PbS, PbTe, AgInZnS, HgS, HgSe, HgTe, GaN, GaP, GaAs, InGaN, InAs, and ZnO, and the shell comprises ZnS, ZnSe, ZnTe, ZnO, CdS It may contain one or more selected from the group consisting of CdSe, CdTe, CdO, InP, InS, GaP, GaN, GaO, InZnP, InGaP, InGaN, InZnSCdSe, PbS, TiO, SrSe, and HgSe, and preferably one or more selected from the group consisting of InP / ZnS, InP / ZnSe, InP / GaP / ZnS, InP / ZnSe / ZnS, InP / ZnSeTe / ZnS, and InP / MnSe / ZnS.

[0053] According to an exemplary embodiment, the core comprises a tetraatomic compound of silver (Ag), indium (In), gallium (Ga), and sulfur (S). For example, the core is AgInGaS. Such a core has the advantage of more efficiently absorbing short-wavelength light sources and minimizing the light absorption rate of the emission region, so excellent light conversion efficiency can be expected even with a small content.

[0054] The shell contains at least two elements from In, Ga, and S, and may include, for example, GaS. In this case, the shell in the present invention has the function of suppressing core trap emissions, maintaining a narrow full width at half maximum of the emission wavelength, and improving color purity. According to exemplary embodiments, the core-shell quantum dots include, but are not limited to, AgInGaS / GaS.

[0055] In some embodiments, the present invention may further include quantum dots of other structures in addition to the core-shell structure described above, as necessary. For example, it may further include, but is not limited to, quantum dots of core-shell structures such as InP / ZnSe / ZnS, InP / ZnS, InGaP / ZnS, and InGaP / ZnSe / ZnS.

[0056] The quantum dots can be synthesized by a wet chemical process, metal-organic chemical vapor deposition (MOCVD), or molecular beam epitaxy (MBE), but are not limited to these methods. Preferably, synthesis by a wet chemical process yields quantum dots with even better optical properties.

[0057] The aforementioned wet chemical process is a method of growing particles by adding a precursor substance to an organic solvent. As the crystals grow, the organic solvent naturally coordinates to the surface of the quantum dot crystals and acts as a dispersant, regulating the crystal growth. Therefore, it is preferable to use the aforementioned wet chemical process to manufacture the quantum dots because it is an easier and less expensive process than organometallic chemical vapor deposition or vapor phase deposition methods such as molecular beam epitaxy, allowing for control of nanoparticle growth.

[0058] In the present invention, the luminescent particles are present in the light-converting ink composition in an amount of 3 to 50% by weight, preferably 5 to 45% by weight, and more preferably 8 to 40% by weight, relative to the total weight of solids. When the luminescent particles are included within this range, the light conversion efficiency can be improved.

[0059] If the amount of light-emitting particles is below the specified content range, the light conversion efficiency may decrease, making it difficult to realize a high-quality display device. Furthermore, if the amount exceeds the specified content range, there may be insufficient components to achieve curing, which may reduce the productivity of the post-processing steps in display manufacturing and the reliability of the product due to insufficient curing of the coating film.

[0060] Compounds represented by chemical formulas 1-4 In one embodiment of the present invention, the photoconversion ink composition contains one or more compounds represented by the following chemical formulas 1 to 4.

[0061] [Chemical formula 1] TIFF0007884464000013.tif23114

[0062] In the aforementioned chemical formula 1, R 11 is either a hydrogen or a methyl group; R 12 These are directly bonded or alkylene groups having 1 to 30 carbon atoms; R 13 These are alkylene groups having 1 to 30 carbon atoms, alkenylene groups having 2 to 30 carbon atoms, cycloalkylene groups having 3 to 30 carbon atoms, heterocycloalkylene groups having 3 to 30 carbon atoms, alkylene oxy groups having 1 to 30 carbon atoms, alkylene ester groups having 2 to 31 carbon atoms, arylene groups having 5 to 30 carbon atoms, or arylalkylene groups having 6 to 30 carbon atoms; n1 is an integer between 0 and 100, and when n1 is 0, direct concatenation occurs.

[0063] The aforementioned alkylene group having 1 to 30 carbon atoms refers to a linear or branched divalent hydrocarbon consisting of 1 to 30 carbon atoms. Examples include, but are not limited to, methylene, ethylene, n-propylene, isopropylene, n-butylene, isobutylene, n-pentylene, n-hexylene, n-heptylene, n-octylene, and n-nonylene groups.

[0064] The aforementioned C2-C30 alkenylene group refers to a linear, branched, or cyclic divalent hydrocarbon derived from an alkene consisting of 2-30 carbon atoms.

[0065] The aforementioned cycloalkylene group having 3 to 30 carbon atoms refers to a simple or fusion cyclic divalent hydrocarbon consisting of 3 to 30 carbon atoms. Examples include, but are not limited to, cyclopropylene, cyclobutylene, cyclopentylene, and cyclohexylene groups.

[0066] The aforementioned heterocycloalkylene group (heteroarylalkylene group) having 3 to 30 carbon atoms means a group consisting of 3 to 30 carbon atoms in which at least one carbon atom (C) in the ring of the cycloalkylene group is substituted with a heteroatom such as an oxygen atom (O), a nitrogen atom (N), or a sulfur atom (S).

[0067] The aforementioned arylene group having 5 to 30 carbon atoms refers to a monocyclic or polycyclic divalent aromatic hydrocarbon derived from an arene consisting of 5 to 30 carbon atoms. Examples include, but are not limited to, phenylene, biphenylene, terphenylene, and naphthylene groups.

[0068] The aforementioned arylalkylene group having 6 to 30 carbon atoms means a group consisting of 6 to 30 carbon atoms in which at least one hydrogen atom (H) in the arylene group is substituted with a radical such as a lower alkylene, for example, methylene, ethylene, or propylene. Examples include, but are not limited to, benzylene and phenylethylene.

[0069] The alkylene group, alkenylene group, cycloalkylene group, heterocycloalkylene group, alkylene oxy group, alkylene ester group, arylene group, or arylalkylene group may have one or more substituents, and the substituents may be, but are not limited to, C1-C6 alkyl groups, C2-C6 alkenyl groups, C2-C6 alkynyl groups, C3-C10 cycloalkyl groups, C3-C10 heterocycloalkyl groups, C3-C10 heterocycloalkyloxy groups, C1-C6 haloalkyl groups, C1-C6 alkoxy groups, C1-C6 thioalkoxy groups, aryl groups, acyl groups, hydroxyl groups, thiol groups, halogens, amino groups, alkoxycarbonyl groups, carboxyl groups, carbamoyl groups, cyano groups, nitro groups, etc.

[0070] The compound represented by chemical formula 1 improves the light conversion efficiency, color purity, and uniformity of the coating film formed by the light conversion ink composition, and, if the light conversion ink composition contains scattering particles, it plays a role in suppressing the aggregation phenomenon of scattering particles.

[0071] Specifically, in the present invention, the compound represented by chemical formula 1 may be included in the form of an individual component of the ink composition (for example, an additive) rather than being coordinately bonded to the surface of the luminescent particles, in order to maximize the processability of the ink composition, but is not limited to this.

[0072] [Chemical formula 2] TIFF0007884464000014.tif27114

[0073] (In the above chemical formula 2, R 21 and R 22 Each of these is independently a divalent to tetravalent hydrocarbon group having 1 to 10 carbon atoms; R 23 ~R 26 Each of these independently consists of hydrogen, a substituted or unsubstituted C1-C5 alkyl group, a thiol group, or TIFF0007884464000015.tif10114

[0074] And R 27 This is a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms; n2 is an integer from 1 to 5, and if n2 is 2 or greater, multiple R 22 , R 25 and R 26 These elements may be independent of each other and may be different from one another.

[0075] [Chemical formula 3] TIFF0007884464000016.tif48114

[0076] In the aforementioned chemical formula 3, R 28 and R 29 These are, independently, a hydrogen atom or a methyl group; m2 is an integer between 1 and 3, and if m2 is 2 or greater, multiple R 29 They may be different from one another.

[0077] The C1-C5 alkyl group refers to a linear or branched monovalent hydrocarbon consisting of 1-C10 carbon atoms, and the C1-C5 or C1-C10 alkylene group refers to a linear or branched divalent hydrocarbon consisting of 1-C5 or C1-C10 carbon atoms. Examples include, but are not limited to, methyl(len) group, ethyl(len) group, n-propyl(len) group, isopropyl(len) group, n-butyl(len) group, isobutyl(len) group, n-pentyl(len) group, n-hexyl(len) group, n-heptyl(len) group, n-octyl(len) group, and n-nonyl(len) group.

[0078] The alkyl and / or alkylene group may have one or more substituents, and the substituents may be C1-C6 alkyl groups, C2-C6 alkenyl groups, C2-C6 alkynyl groups, C3-C10 cycloalkyl groups, C3-C10 heterocycloalkyl groups, C3-C10 heterocycloalkyloxy groups, C1-C6 haloalkyl groups, C1-C6 alkoxy groups, C1-C6 thioalkoxy groups, aryl groups, acyl groups, hydroxyl groups, thiol groups, halogens, amino groups, alkoxycarbonyl groups, carboxyl groups, carbamoyl groups, cyano groups, nitro groups, etc., but those substituted with a thiol group at the terminal end are most preferred.

[0079] The additives of chemical formula 2 and / or chemical formula 3 can improve the photoconversion efficiency, blue light absorbance, and hardness of the coating film formed by the photoconversion ink composition. In particular, in the case of compositions containing AIGS-based quantum dots containing a tetraelement compound of silver (Ag), indium (In), gallium (Ga), and sulfur (S) in the core, a problem may arise in which the photoefficiency decreases due to oxygen and moisture during the ink manufacturing process. However, by using the thiols of chemical formulas 1 and 2 of the present invention, the quantum dots can be protected from the external environment, thereby achieving excellent photoefficiency and light absorption.

[0080] [Chemical formula 4] TIFF0007884464000017.tif28148

[0081] In the aforementioned chemical formula 4, R 41 is a hydrogen or methyl group, X4 is O or -NH-, and R 43 R is a direct bond or an alkylene group having 1 to 10 carbon atoms. 44 and R 45 Each is independently hydrogen, or an alkyl group, allyl group, or cycloalkyl group having 1 to 20 carbon atoms, and R 42 These are substituted or unsubstituted alkylene groups, arylene groups, alkylarylene groups, and alkyl arylene groups having 1 to 20 carbon atoms. TIFF0007884464000018.tif16123

[0082] And at this time, R 46 , R 48 , R 49 , R 410 , R 411 , R 413 and R 414 Each of these is independently a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, and R 47 and R 412 Each of these is independently a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, and l4, m4, and n4 are integers from 1 to 3.

[0083] In the present invention, "substitution" can mean, but is not limited to, substitution with C1-C20 alkyl groups, allyl groups or cycloalkyl groups, C1-C20 alkylene groups, arylene groups or alkylarylene groups.

[0084] The amine of chemical formula 4 and the photopolymerizable structure protect the surface of quantum dots, preventing them from being affected by external oxygen and moisture. This improves the photoconversion efficiency and lightfastness of the photoconversion ink composition of the invention, as well as improving ejection stability.

[0085] The compound represented by chemical formula 1 can be appropriately selected within a range that does not hinder the objective of the present invention, but it is preferable that it includes one or more compounds represented by the following chemical formulas 1-1 to 1-17.

[0086] [Chemical formula 1-1] TIFF0007884464000019.tif19114

[0087] [Chemical formula 1-2] TIFF0007884464000020.tif19114

[0088] [Chemical Formulas 1-3] TIFF0007884464000021.tif19114

[0089] [Chemical Formulas 1-4] TIFF0007884464000022.tif27114

[0090] [Chemical Formulas 1-5] TIFF0007884464000023.tif19114

[0091] [Chemical Formulas 1-6] TIFF0007884464000024.tif19114

[0092] [Chemical Formulas 1-7] TIFF0007884464000025.tif19114

[0093] [Chemical Formulas 1-8] TIFF0007884464000026.tif14146

[0094] [Chemical Formulas 1-9] TIFF0007884464000027.tif22145

[0095] [Chemical Formulas 1-10] TIFF0007884464000028.tif19114

[0096] [Chemical Formula 1-11] TIFF0007884464000029.tif19114

[0097] [Chemical Formula 1-12] TIFF0007884464000030.tif19114

[0098] [Chemical Formula 1-13] TIFF0007884464000031.tif19144

[0099] [Chemical formula 1-14] TIFF0007884464000032.tif19144

[0100] [Chemical formula 1-15] TIFF0007884464000033.tif27145

[0101] [Chemical formula 1-16] TIFF0007884464000034.tif24143

[0102] [Chemical formula 1-17] TIFF0007884464000035.tif23114

[0103] Specifically, the compounds represented by chemical formula 2 may include, but are not limited to, the compounds represented by the following chemical formulas 2-1 to 2-13.

[0104] [Chemical formula 2-1] TIFF0007884464000036.tif9114

[0105] 2,2'-thiobis(ethane-1-thiol) [Chemical formula 2-2] TIFF0007884464000037.tif7114

[0106] 2,2'-(ethane-1,2-diylbis(sulfanediyl))bis(ethane-1-thiol) [Chemical formula 2-3] TIFF0007884464000038.tif13114

[0107] 2,2'-((3-mercaptopropane-1,2-diyl)bis(sulfanediyl))bis(ethane-1-thiol) [Chemical formula 2-4] TIFF0007884464000039.tif18114

[0108] (propane-1,1,3,3-tetrayltetrakis(sulfanediyl))tetramethanethiol [Chemical Formula 2-5] TIFF0007884464000040.tif18144

[0109] 2,2'-((3-mercaptopropane-1,2-diyl)bis(sulfanediyl))bis(propane-1-thiol) [Chemical Formula 2-6] TIFF0007884464000041.tif11114

[0110] 3,3'-thiobis(propane-1,2-dithiol) [Chemical Formula 2-7] TIFF0007884464000042.tif19114

[0111] 3,3'-thiobis(2-((1-mercaptopropan-2-yl)thio)propane-1-thiol) [Chemical Formula 2-8] TIFF0007884464000043.tif7114

[0112] 2,2'-((thiobis(ethane-2,1-diyl))bis(sulfanediyl))bis(ethane-1-thiol) [Chemical Formula 2-9] TIFF0007884464000044.tif12114

[0113] 3,3'-thiobis(2-((2-mercaptoethyl)thio)propane-1-thiol) [Chemical Formula 2-10] TIFF0007884464000045.tif12114

[0114] 2,2'-thiobis(3-((2-mercaptoethyl)thio)propane-1-thiol) [Chemical formula 2-11] TIFF0007884464000046.tif17114

[0115] 2-((3-mercapto-2-((2-mercaptoethyl)thio)propyl)thio)-3-((2-mercaptoethyl)thio)propane-1-thiol [Chemical formula 2-12] TIFF0007884464000047.tif7114

[0116] [Chemical formula 2-13] TIFF0007884464000048.tif11114

[0117] 3,6,10,14,17-pentathianonadecane-1,8,12,19-tetrathiol Furthermore, the compounds represented by chemical formula 2 may include, but are not limited to, the compounds represented by the following chemical formulas 3-1 to 3-5.

[0118] [Chemical formula 3-1] TIFF0007884464000049.tif22114

[0119] (1,4-dithiane-2,3-diyl)dimethanethiol [Chemical formula 3-2] TIFF0007884464000050.tif23114

[0120] (1,4-dithiepane-2,3-diyl)dimethanethiol [Chemical formula 3-3] TIFF0007884464000051.tif21114

[0121] (5-methyl-1,4-dithiane-2,3-diyl)dimethanethiol [Chemical formula 3-4] TIFF0007884464000052.tif21114

[0122] (1,4-dithiocane-2,3-diyl)dimethanethiol [Chemical formula 3-5] TIFF0007884464000053.tif24114

[0123] (5,6-dimethyl-1,4-dithiane-2,3-diyl)dimethanethiol The compound represented by chemical formula 4 can be appropriately selected within a range that does not hinder the objective of the present invention, but it is preferable that it contains one or more compounds represented by the following chemical formulas 4-1 to 4-12 as an amine-based acrylic / acrylamide.

[0124] [Chemical formula 4-1] TIFF0007884464000054.tif17114

[0125] [Chemical formula 4-2] TIFF0007884464000055.tif18146

[0126] [Chemical formula 4-3] TIFF0007884464000056.tif18143

[0127] [Chemical formula 4-4] TIFF0007884464000057.tif18114

[0128] [Chemical formula 4-5] TIFF0007884464000058.tif17143

[0129] [Chemical formula 4-6] TIFF0007884464000059.tif17145

[0130] [Chemical formula 4-7] TIFF0007884464000060.tif18114

[0131] [Chemical formula 4-8] TIFF0007884464000061.tif15114

[0132] [Chemical formula 4-9] TIFF0007884464000062.tif15114

[0133] [Chemical formula 4-10] TIFF0007884464000063.tif15114

[0134] [Chemical formula 4-11] TIFF0007884464000064.tif13114

[0135] [Chemical formula 4-12] TIFF0007884464000065.tif13114

[0136] The compound represented by the aforementioned chemical formula 4 can improve the photoconversion efficiency, lightfastness, and ejection stability of the photoconversion ink composition.

[0137] Furthermore, in one embodiment of the present invention, the compounds represented by chemical formulas 1 to 4 are included not only in the form of additives, but also in the form of organic ligands that coordinate to the surface of the luminescent particles. When the compounds represented by chemical formulas 1 to 4 coordinate to the surface of the luminescent particles as organic ligands, they can play a role in stabilizing the luminescent particles, and by protecting the surface of the luminescent particles, they not only exhibit superior oxidation stability compared to conventional luminescent particles, but also exhibit excellent dispersibility in monomers, thereby improving optical properties.

[0138] In one embodiment of the present invention, the light-converting ink composition includes the compounds represented by chemical formulas 1 to 4 in the form of additives that are components of individual ink compositions, as well as in the form that are coordinately bonded to the surface of light-emitting particles as organic ligands.

[0139] The compound represented by chemical formula 1 is included in the photoconversion ink composition in an amount exceeding 0.1% by weight but less than 20% by weight, relative to the total weight of solids. When the compound represented by chemical formula 1 is included within the above range, the photoconversion efficiency and coating film uniformity can be further improved, and if the photoconversion ink composition contains scattering particles, the aggregation phenomenon of scattering particles can be further suppressed, improving the ejection stability in the inkjet process.

[0140] Polymerizable monomers In one embodiment of the present invention, the photoconversion ink composition comprises a polymerizable monomer.

[0141] The polymerizable monomer may include a compound represented by the following chemical formula 5. [Chemical formula 5] TIFF0007884464000066.tif30114

[0142] In the aforementioned chemical formula 5, R 51 These are substituted or unsubstituted alkylene groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkylene groups having 3 to 10 carbon atoms, substituted or unsubstituted arylene groups having 5 to 20 carbon atoms, substituted or unsubstituted heteroarylene groups having 2 to 15 carbon atoms, substituted or unsubstituted arylalkylene groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroarylalkylene groups having 3 to 30 carbon atoms, substituted or unsubstituted alkenylene groups having 2 to 10 carbon atoms, and substituted or unsubstituted alkylylene groups having 2 to 10 carbon atoms; R 52 and R 53 Each of these is independently either a hydrogen atom or a methyl group; m5 is an integer between 1 and 15.

[0143] The alkylene group, cycloalkylene group, arylene group, arylalkylene group, heteroarylalkylene group, and alkenylene group may be substantially the same as those described in the compound represented by chemical formula 1 above.

[0144] The aforementioned heteroarylene group having 2 to 15 carbon atoms means that it consists of 2 to 15 carbon atoms, and at least one of the carbon atoms (C) contained in the arylene group is substituted with a different atom such as an oxygen atom (O), a nitrogen atom (N), or a sulfur atom (S). For example, thiophene group, furanyl group, pyrrole group, imidazolyl group, thiazolyl group, oxazolyl group, oxadiazolyl group, pyridyl group, bipyridyl group, pyrimidyl group, triazinyl group, triazolyl group, acridyl group, pyridadinyl group, pyrazinyl group, quinolinyl group, quinazolinyl group, quinoxalinyl group, phthalazinyl group, pyridopyrimidyl group, pyridopyrazinyl group, pyrazinopyrazinyl group, isoquinolinyl group, indolyl group, carbazolyl group, benzoxazolyl group, benzimidazolyl group, benzothiazolyl group, benzocarbazolyl group, benzothiophene group, dibenzothiophene group, benzofuranyl group, f This includes, but is not limited to, phenanthroline, thiazolyl, isoxazolyl, oxadiazolyl, thiadiazolyl, benzothiazolyl, phenothiazinyl, aziridyl, azaindolyl, isoindolyl, indazolyl, purine, pteridine, beta-carbonyl, naphthyridine, ter-pyridyl, phenazinyl, imidazopyridyl, pyropyridyl, azepine, pyrazolyl, dibenzofuranyl, or their divalent functional groups.

[0145] The aforementioned C2-C10 alkynylene group refers to a linear, branched, or cyclic divalent hydrocarbon derived from an alkyne consisting of 2 to 10 carbon atoms.

[0146] In one embodiment, the R 51This may be an alkylene group having 1 to 20 carbon atoms, or preferably an alkylene group having 2 to 16 carbon atoms. 51 When the alkylene group has 1 to 20 carbon atoms, the light-converting ink composition of the present invention exhibits excellent dispersibility of light-emitting particles without the need for solvents, resulting in improved jetting properties, and improved coating film hardness and thickness uniformity.

[0147] In one embodiment, as described above, m5 may be an integer from 1 to 15, and preferably an integer from 1 to 5. If it exceeds the above range, the viscosity may be high and the dispersibility may decrease.

[0148] The compound represented by chemical formula 5 can be appropriately selected within a range that does not hinder the objectives of the present invention, but may include one or more selected from the group consisting of 1,6-hexanediol diacrylate, polyethylene glycol diacrylate, 2-hydroxy-3-methacrylate, 1,9-bisacryloyloxynonane, and tripropylene glycol diacrylate.

[0149] The compound represented by chemical formula 5 improves the dispersibility of luminescent particles, thereby enabling the realization of a low-viscosity photoconversion ink composition with a viscosity of 80 cP or less without the need for solvents. As a result, the photoconversion ink composition according to the present invention can be effectively used to manufacture photoconversion laminated substrates using an inkjet printing method.

[0150] The photoconversion ink composition of the present invention may further contain polymerizable compounds commonly used in the art, in addition to the polymerizable monomer represented by chemical formula 5, without departing from the purpose of the present invention. Examples include monofunctional monomers, difunctional monomers, and other polyfunctional monomers, of which difunctional monomers are preferably used.

[0151] The type of monofunctional monomer is not particularly limited, and examples include nonylphenylcarbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexylcarbitol acrylate, 2-hydroxyethyl acrylate, and N-vinylpyrrolidone.

[0152] The type of the aforementioned difunctional monomer is not particularly limited, and examples include bis(acryloyloxyethyl) ether of bisphenol A.

[0153] The type of polyfunctional monomer is not particularly limited, and examples include trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, ethoxylated dipentaerythritol hexa(meth)acrylate, propoxylated dipentaerythritol hexa(meth)acrylate, and dipentaerythritol hexa(meth)acrylate.

[0154] In this case, if the composition further contains three or more functional or polyfunctional curable monomers, inkjet properties can be obtained if the viscosity of the photoconversion ink composition is controlled to within 80 cP.

[0155] The polymerizable monomer is present in an amount of 30 to 95% by weight, preferably 40 to 90% by weight, relative to the total weight of solids in the light-converting ink composition. When the polymerizable monomer is included within the above range, it has the advantage of being preferable in terms of the strength and smoothness of the pixel portion. If the polymerizable monomer is included in an amount less than the above range, it becomes difficult to ensure fluidity for inkjetting, and if it is included in an amount greater than the above range, it may cause problems such as insufficient content of light-emitting particles and a decrease in light efficiency, so it is preferable that it be included within the above range.

[0156] Compound represented by chemical formula 6 The optical conversion ink composition according to the present invention may further contain a compound represented by Chemical Formula 6.

[0157] [Chemical Formula 6] TIFF0007884464000067.tif16114

[0158] In the above Chemical Formula 6, Z is a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 10 carbon atoms, a substituted or unsubstituted alkyl ester group having 2 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 4 to 30 carbon atoms, a substituted or unsubstituted thioester group having 1 to 30 carbon atoms, a substituted or unsubstituted silyl ester group having 1 to 30 carbon atoms, a thioether group or a silyl group; R 67 and R 68 are each independently a direct bond, a substituted or unsubstituted alkylene group having 1 to 30 carbon atoms, -OR 69 -, -OC(=O)R 610 -, -(OCH2CH2 -) p -, or -(OCH2CH2CH2) q -; Q1 and Q2 are each independently a direct bond, an oxygen atom, a sulfur atom or -NH-; D is an oxygen atom, a sulfur atom or =NH; R 69 is a substituted or unsubstituted alkylene group having 1 to 30 carbon atoms; R 610 is a substituted or unsubstituted alkylene group having 4 to 30 carbon atoms; p and q are each independently an integer of 1 to 150.

[0159] The compound represented by chemical formula 6 can be appropriately selected within a range that does not hinder the objective of the present invention, but it is preferable that it includes one or more compounds represented by the following chemical formulas 6-1 to 6-7.

[0160] [Chemical formula 6-1] TIFF0007884464000068.tif13114

[0161] [Chemical formula 6-2] TIFF0007884464000069.tif14114

[0162] [Chemical formula 6-3] TIFF0007884464000070.tif15146

[0163] [Chemical formula 6-4] TIFF0007884464000071.tif13145

[0164] [Chemical formula 6-5] TIFF0007884464000072.tif15130

[0165] [Chemical formula 6-6] TIFF0007884464000073.tif13114

[0166] [Chemical formula 6-7] TIFF0007884464000074.tif13114

[0167] The compound represented by chemical formula 6 has the advantage of preventing oxidation of quantum dots during the thermal process in the manufacturing of photoconversion multilayer substrates by adequately protecting the surface of the partially unprotected shell, thereby improving light efficiency.

[0168] The compound represented by chemical formula 6 is present in the photoconversion ink composition in an amount of 0.1 to 15% by weight relative to the total weight of solids. When the compound represented by chemical formula 6 is included within this range, it is possible to increase the light efficiency while also having advantages in terms of the dispersibility of scattering particles and the viscosity stability over time.

[0169] scattering particles The light-converting ink composition according to the present invention may further contain scattering particles.

[0170] The scattering particles can be made of ordinary inorganic materials, and preferably include metal oxides with an average particle size of 50 to 1000 nm.

[0171] The metal oxide may, but is not limited to, an oxide containing one metal selected from the group consisting of Li, Be, B, Na, Mg, Al, Si, K, Ca, Sc, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, Ge, Rb, Sr, Y, Mo, Cs, Ba, La, Hf, W, Tl, Pb, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Ti, Sb, Sn, Zr, Nb, Ce, Ta, In, and combinations thereof.

[0172] Specifically, one material selected from the group consisting of Al2O3, SiO2, ZnO, ZrO2, BaTiO3, TiO2, Ta2O5, Ti3O5, ITO, IZO, ATO, ZnO-Al, Nb2O3, SnO, MgO, BaSO4, and combinations thereof is possible. If necessary, materials surface-treated with compounds containing unsaturated bonds, such as acrylates, can also be used.

[0173] When the light-converting ink composition according to the present invention contains scattering particles, it is preferable because the scattering particles increase the path of light emitted from the light-emitting particles, thereby improving the overall light efficiency in the light-converting coating layer. From this perspective, it is preferable that the light-converting ink composition of the present invention contains one or more scattering particles selected from TiO2, SiO2, ZnO, and BaSO4.

[0174] The scattering particles can have an average particle size of 50 to 1000 nm, preferably in the range of 100 to 500 nm. If the particle size is too small, a sufficient scattering effect of light emitted from the quantum dots cannot be expected, and conversely, if it is too large, the particles will sink into the composition or a uniform quality self-luminous layer surface cannot be obtained. Therefore, the particle size should be adjusted appropriately within the above range.

[0175] The scattering particles are present in the light-converting ink composition in an amount of 0.5 to 20% by weight, preferably 1 to 15% by weight, and more preferably 2 to 10% by weight, relative to the total weight of solids. It is preferable that the scattering particles are within the above range, as this maximizes the effect of increasing the luminescence intensity. If the scattering particles are present in an amount less than the above range, it may be somewhat difficult to secure the desired luminescence intensity, and if they exceed the above range, the transmittance of the blue irradiation light decreases significantly, resulting in a problem where the light conversion of the luminescent particles does not function. Therefore, it is preferable to use them appropriately within the above range.

[0176] Photopolymerization initiator A photoconversion ink composition according to one embodiment of the present invention may additionally contain a photopolymerization initiator.

[0177] In one embodiment of the present invention, the photopolymerization initiator can be of any type as long as it can polymerize the polymerizable monomer. For example, from the viewpoint of polymerization characteristics, initiation efficiency, absorption wavelength, availability, and price, it is preferable to use one or more compounds selected from the group consisting of acetophenone compounds, benzophenone compounds, triazine compounds, biimidazole compounds, oxime compounds, thioxanthone compounds, and phosphine oxide compounds as the photopolymerization initiator.

[0178] For example, using oxime compounds or phosphine oxide compounds for thick film curing of 5 μm or more can ensure even better physical properties in terms of curing density and surface roughness of the cured film.

[0179] Specific examples of the aforementioned oxime compounds include o-ethoxycarbonyl-α-oxyimino-1-phenylpropan-1-one, and representative commercially available products include BASF's Irgacure OXE 01 and OXE 02.

[0180] Typical examples of the aforementioned phosphine oxide compounds include trimethylbenzoylphenylphosphine oxide, such as Darocur TPO and Lucirin TPO from BASF.

[0181] The photopolymerization initiator is contained in an amount of 0.1 to 10% by weight, preferably 0.5 to 8% by weight, relative to the total weight of solids in the photoconversion ink composition. When the photopolymerization initiator is contained within the above range, the photoconversion ink composition becomes highly sensitive and the exposure time is shortened, which improves productivity and is therefore preferable. If the photopolymerization initiator is contained in an amount less than the above range, light curing is insufficient and sufficient hardness cannot be obtained. If it is contained in an amount greater than the above range, the decrease in the light conversion efficiency of the light-emitting particles due to the photopolymerization initiator increases rapidly, resulting in the problem of not being able to obtain the desired light emission intensity. Therefore, using within the above range has the advantage of improving the strength of the pixel portion and the smoothness of the surface of the pixel portion.

[0182] The photopolymerization initiator may further contain a photopolymerization initiator to improve the sensitivity of the photoconversion ink composition according to the present invention. The inclusion of the photopolymerization initiator has the advantage of further increasing sensitivity and improving productivity.

[0183] The photopolymerization initiator may preferably be one or more compounds selected from the group consisting of amine compounds, carboxylic acid compounds, and organosulfur compounds having a thiol group, but is not limited thereto.

[0184] The aforementioned photopolymerization initiator can be added as appropriate, within a range that does not inhibit the effects of the present invention.

[0185] additives In addition to the above components, the photoconversion ink composition according to one embodiment of the present invention may optionally contain additives such as surfactants, antioxidants, and silane coupling agents.

[0186] The photoconversion ink composition according to the present invention has the advantage of improving the flatness of the coating film when it contains the surfactant. For example, the surfactant can be a fluorine-based surfactant such as BM-1000, BM-1100 (BM Chemie), Florard FC-135 / FC-170C / FC-430 (Sumitomo 3M Co., Ltd.), or SH-28PA / -190 / -8400 / SZ-6032 (Toray Silicone Co., Ltd.), but is not limited to these.

[0187] In one embodiment, the light-converting ink composition of the present invention may contain an antioxidant. The antioxidant prevents oxidation of the light-converting ink composition and the coating film formed therefrom, thereby further improving the light-converting properties and color purity.

[0188] The antioxidant is not particularly limited as long as it can further improve the photoconversion properties or color purity of the photoconversion ink composition, but it may be at least one of antioxidants containing phenolic compounds, phosphorus compounds, and sulfur compounds, or preferably contains at least one of antioxidants containing phenolic compounds and phosphorus compounds, and antioxidants containing phenolic compounds and sulfur compounds.

[0189] In one embodiment, the light-converting ink composition of the present invention may contain a silane coupling agent. The silane coupling agent may be added to improve adhesion to the substrate.

[0190] Examples of silane coupling agents include compounds having at least one organic functional group and at least one hydrolyzable group in one molecule, wherein the hydrolyzable group is an alkoxy group bonded to a silicon atom. Preferably, the silane coupling agent has at least one organic functional group selected from the group consisting of epoxy groups, (meth)acrylooxy groups, mercapto groups, and amino groups. Here, (meth)acrylooxy group means acrylic group (CH2=CHCOO-) or methacryloxy group (CH2=C(CH3)COO-).

[0191] Examples of silane coupling agents having an epoxy group include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltriethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethylmethyldimethoxysilane, 2-(3,4-epoxycyclohexyl)ethylmethyldiethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane, 5,6-epoxyhexyltrimethoxysilane, 5,6-epoxyhexylmethyldimethoxysilane, 5,6-epoxyhexylmethyldiethoxysilane, and 5,6-epoxyhexyltriethoxysilane.

[0192] Examples of silane coupling agents having a (meth)acrylooxy group include 3-(meth)acrylooxypropyltrimethoxysilane, 3-(meth)acrylooxypropylmethyldimethoxysilane, 3-(meth)acrylooxypropyltriethoxysilane, 3-(meth)acrylooxypropylmethyldiethoxysilane, 3-(meth)acrylooxypropyldimethylethoxysilane, and 3-(meth)acrylooxypropyldimethylmethoxysilane.

[0193] Examples of silane coupling agents having a mercapto group include 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropylmethyldiethoxysilane, and 3-mercaptopropyltriethoxysilane.

[0194] Examples of silane coupling agents having an amino group include 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldiethoxysilane, N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropyltriethoxysilane, 3-(methylamino)propyltrimethoxysilane, and 3-(methylamino)propyltriethoxysilane.

[0195] In addition, the light-converting ink composition according to the present invention may further contain additives such as ultraviolet absorbers and anti-aggregating agents, to the extent that they do not impede the effects of the present invention, and such additives can be added as appropriate by those skilled in the art, also to the extent that they do not impede the effects of the present invention.

[0196] The additive can be used in an amount of 0.01 to 10% by weight, specifically 0.02 to 8% by weight, and more specifically 0.03 to 5% by weight, relative to the total weight of solids in the light-converting ink composition, but is not limited thereto. When the additive is included within the above range, the flatness, adhesion, etc., of the light-converting ink composition can be improved, which is preferable. If the additive is included in an amount less than the above range, the expected effects such as flatness or adhesion may not be sufficient, and if it is included in an amount greater than the above range, the content of luminescent particles or polymerizable monomers decreases, leading to problems such as a decrease in luminescence intensity or a decrease in the degree of curing of the cured film. Therefore, using the additive within the above range has the advantage of improving the strength of the pixel portion and the flatness or adhesion on the surface of the pixel portion.

[0197] solvent A light-converting ink composition according to one embodiment of the present invention may further contain a solvent, or it may be a solvent-free type that does not contain a solvent. If the light-converting ink composition of the present invention contains a solvent, for example, it may further contain the solvent in an amount of 20% by weight or less relative to the total weight of the light-converting ink composition.

[0198] Preferably, the light conversion ink composition according to one embodiment of the present invention may be solvent-free, as it does not contain solvents, from the viewpoint of continuous processability.

[0199] Even in the solvent-free form, the photoconversion composition of the present invention, by containing the polymerizable monomers described above, exhibits excellent optical properties and dispersibility of luminescent particles, enables low viscosity, and provides excellent nozzle jetting characteristics for ink.

[0200] As the aforementioned solvent, ether or ester-based solvents, aliphatic saturated hydrocarbon solvents, halogenated hydrocarbon solvents, aromatic hydrocarbon solvents, etc. can be used. For example, ethylene glycol monoalkyl ethers such as propylene glycol methyl ether acetate (PGMEA), ethylene glycol monoethyl ether acetate, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, etc., diethylene glycol dialkyl ethers such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, diethylene glycol dibutyl ether, methyl cellosolve acetate You can use ethylene glycol alkyl ether acetates such as ethyl cellosolve acetate, alkylene glycol alkyl ether acetates such as propylene glycol monopropyl ether acetate, methoxybutyl acetate, and methoxypentyl acetate, aromatic hydrocarbons such as benzene, toluene, xylene, and mesitylene, ketones such as methyl ethyl ketone, acetone, methyl amyl ketone, methyl isobutyl ketone, and cyclohexanone, alcohols such as ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol, and glycerin, esters such as ethyl 3-ethoxypropionate and methyl 3-methoxypropionate, and cyclic esters such as γ-butyrolactone.

[0201] <Optical conversion laminated substrate, backlight unit, and image display device> One embodiment of the present invention is a photoconversion laminated substrate that absorbs light emitted by a light-emitting element, converts it to blue, green, or red light, and emits it, wherein the photoconversion laminated substrate is formed using the above-described photoconversion ink composition.

[0202] Furthermore, the present invention can provide a light-converting pixel substrate that functions as a red, green, and blue color filter, manufactured using the above-described light-converting ink composition.

[0203] The optical conversion laminate and / or optical conversion pixel substrate is formed by applying the above-described optical conversion ink composition to a predetermined area using an inkjet method and curing the applied optical conversion ink composition.

[0204] Examples of substrates with flat surfaces include, but are not limited to, glass substrates, silicon substrates, polycarbonate substrates, polyester substrates, aromatic polyamide substrates, polyamide-imide substrates, polyimide substrates, Al substrates, and GaAs substrates. These substrates can be pretreated with chemical treatments such as silane coupling agents, plasma treatment, ion plating, sputtering, gas-phase reaction treatment, and vacuum deposition. When a silicon substrate is used as the substrate, charge-coupled elements (CCDs), thin-film transistors (TFTs), etc., are formed on the surface of the silicon substrate. A partition matrix may also be formed. The curing can be carried out under thermal curing conditions.

[0205] For example, the curing can be carried out at 100 to 250°C, preferably 150 to 230°C, for 5 to 30 minutes, preferably 10 minutes.

[0206] For ink to be ejected from a piezo inkjet head, which is an example of an inkjet sprayer, and to form a suitable phase on a substrate, the properties such as viscosity, fluidity, and quantum dot particles must be balanced with those of the inkjet head. The piezo inkjet head used in this invention is not limited, but it ejects ink having a droplet size of about 3 to 100 pL, preferably about 5 to 40 pL.

[0207] The viscosity of the light-converting ink composition of the present invention is suitable to be about 3 to 50 cP, and more preferably adjusted to a range of 7 to 40 cP.

[0208] The optical conversion laminated substrate according to the present invention can exhibit excellent optical output when applied to a blue light source.

[0209] One embodiment of the present invention is a green light-emitting element that emits green light. Specifically, it may emit green light with a wavelength of 500 to 600 nm, but is not limited thereto.

[0210] The green light-emitting element may be a green light-emitting diode (LED). One embodiment of the present invention relates to a backlight unit characterized by including a light conversion laminated substrate applied to the blue light source.

[0211] The backlight unit may additionally include components usually included such as a light guide plate and a reflector.

[0212] One embodiment of the present invention relates to an image display device including the backlight unit. The image display device of the present invention includes various image display devices such as not only ordinary liquid crystal display devices but also electroluminescent display devices, plasma display devices, field emission display devices, etc.

[0213] Also, one embodiment of the present invention relates to a light conversion pixel including a cured product of the above-described light conversion ink composition.

[0214] For example, it includes steps of applying the above-described light conversion ink composition to a predetermined area by an inkjet method and curing the applied light conversion ink composition, and a light conversion pixel can be manufactured by forming a pattern of the light conversion ink composition.

[0215] Hereinafter, experimental examples including specific examples and comparative examples are presented for understanding the present invention. However, this is only illustrative of the present invention and does not limit the appended claims. It is obvious to those skilled in the art that various changes and modifications to the examples are possible within the scope of the present invention and its technical idea, and it is needless to say that such variations and modifications belong to the appended claims. Also, hereinafter, “%” and “parts” indicating content are on a weight basis unless otherwise specified.

Example

[0216] <Experimental Example I> A-1 Production Example: Synthesis of AgInGaS / GaS core-shell luminescent particles and production of dispersions A mixed solution was prepared by placing 0.0625 mmol of silver iodide (AgI, 99.999%), 1.25 mmol of gallium acetylacetonate (Ga(acac)3, 99.99%), and 1 mmol of sulfur (99.998%) in a three-neck flask with 1.5 mL of 1-dodecanethiol (DDT≧98%) and 5 mL of oleylamine (OLA, 70%). The mixed solution was heated to 120°C to degass it, followed by N2 purging, and then the temperature was raised to the growth temperature of 240°C. The AGS core QD was grown at this temperature for 30 minutes. 0.01 mmol of indium acetate (In(Ac)3, 99.99%) was added to this AGS core solution. The mixed solution was heated to 120°C to degass it, followed by N2 purging, and then the temperature was raised to the growth temperature of 240°C. The AIGS core QD was grown at this temperature for 10 minutes.

[0217] The AIGS core QD was mixed with 7 ml of oleylamine, 0.1 mmol of gallium acetylacetonate (Ga(acac)3, 99.99%), and 0.1 mmol of 1,3-dimethylthiourea, and the mixture was rapidly heated to 230°C. Then, under inert conditions, the temperature was increased by 2°C per minute until it reached 280°C. The solution was cooled again to room temperature, and sulfur compounds that did not participate in the reaction were removed by degas for 30 minutes. The quantum dots were precipitated in ethanol, purified by centrifugation, and then dried under reduced pressure to obtain AgInGaS / GaS quantum dot powder. The obtained quantum dot powder was mixed with 1,6-hexanediol diacrylate in a 1:1 ratio to prepare an AgInGaS / GaS dispersion.

[0218] Examples, reference examples, and comparative examples: Production of photoconversion ink compositions Light-converting ink compositions were prepared by mixing the components according to the compositions shown in Tables 1 and 2 below.

[0219] [Table 1]

[0220] [Table 2]

[0221] -A-1: AgInGaS / GaS luminescent particle dispersion -B-1: 1,6-Hexendiol diacrylate (Shin-Nakamura Chemical Co., Ltd.) -B-2: Polyethylene glycol diacrylate (Shin-Nakamura Chemical Co., Ltd.) -C:TiO2 (Huntsman, TR-88, particle size 220nm) -D: Diphenyl(2,4,6-trimethylbenzoyl)phosphone oxide (Aldrich) -E:SH8400 (Dow Corning Toray Silicone Co., Ltd.) -F-1: Compound represented by chemical formula 1-1 [Chemical formula 1-1] TIFF0007884464000077.tif19114

[0222] -F-2: Compound represented by chemical formula 1-2 [Chemical formula 1-2] TIFF0007884464000078.tif19114

[0223] -F-3: Compounds represented by chemical formulas 1-5 [Chemical formula 1-5] TIFF0007884464000079.tif19114

[0224] -F-4: Compounds represented by chemical formulas 1-7 [Chemical formula 1-7] TIFF0007884464000080.tif19114

[0225] -F-5: Compounds represented by chemical formulas 1-8 [Chemical formula 1-8] TIFF0007884464000081.tif14146

[0226] -F-6: Compound represented by Chemical Formula 1-11 [Chemical Formula 1-11] TIFF0007884464000082.tif19114

[0227] -F-7: Compound represented by Chemical Formula 1-13 [Chemical Formula 1-13] TIFF0007884464000083.tif19144

[0228] -F-8: Compound represented by Chemical Formula 1-14 [Chemical Formula 1-14] TIFF0007884464000084.tif19144

[0229] -G-1: 3-aminopropyldimethoxymethylsilane (Gelest) -G-2: 3-glycidoxypropyltrimethoxysilane (Gelest) -G-3: 3-acryloxypropyltrimethoxysilane (Gelest) -H: Sumilizer-GP (Sumitomo Chemical) Manufacturing Example I-1: Manufacturing of a light conversion coating layer After each of the photoconversion ink compositions produced in the examples and comparative examples was applied onto a 5 cm × 5 cm glass substrate by an inkjet method, it was irradiated with a 395 nm Blue LED lamp at 4000 mJ / cm 2 under nitrogen conditions, and then heated on a hot plate at 180 °C for 30 minutes under nitrogen conditions to produce a photoconversion coating layer.

[0230] Experimental Examples I-1 and I-2: Evaluation of light conversion efficiency and blue light absorbance After positioning the manufactured light-converting coating layer on top of a blue light source (XLamp XR-E LED, Royal blue 450, Cree), the light-converting efficiency and blue light absorbance were measured using a luminance meter (CAS140CT Spectrometer, Instrument Systems). The results are shown in Table 3 below.

[0231] Experimental Example I-2: Evaluation of Coating Hardness The degree of hardening of the manufactured photoconversion coating layer was measured at a high temperature of 150°C using a hardness tester (HM500; Fischer product), and the coating hardness was evaluated according to the evaluation criteria below. The results are shown in Table 3 below.

[0232] <Criteria for evaluating coating hardness> ○: Surface hardness 50 or more △: Surface hardness between 30 and 50 ×: Surface hardness less than 30 Experimental Example I-3: Evaluation of Discharge Continuity After filling the manufactured light-converting ink composition into UniJet's inkjet printing equipment, the jetting head temperature was fixed at 40°C, and ink ejection was performed for 2 hours to evaluate nozzle clogging and droplet characteristics. Ejection continuity was evaluated according to the following criteria, and the results are shown in Table 3 below. <Evaluation Criteria> ○: No nozzle clogging, good droplet straightness. △: No nozzle clogging, but droplet curve occurs. ×: Nozzle clog Experimental Example I-4: Pattern Floating Evaluation After the respective photoconversion ink compositions prepared in the examples and comparative examples were jetted onto partition substrates using an inkjet method, they were subjected to a 4000 mJ / cm² treatment using a 395 nm Blue LED lamp under nitrogen conditions. 2 After irradiation, the photoconversion coating layer was manufactured by heating it on a hot plate at 180°C for 30 minutes under nitrogen conditions. The manufactured photoconversion coating layer was checked for pattern lifting at the glass interface using OM, and the results are shown in Table 3 below.

[0233] <Evaluation Criteria> ○: No pattern lifting occurred at all. △: Pattern floating occurs, resulting in a total pattern exceeding 0% or less than 40%. ×: Pattern floating occurs, with the overall pattern exceeding 40% and falling below 70%.

[0234] [Table 3]

[0235] Referring to Table 3 above, Examples I-1 to I-14 and Reference Examples I-1 and I-2, which satisfy the composition according to the present invention, all showed good or excellent levels of effectiveness in terms of light conversion efficiency, blue light absorbance, coating hardness, discharge continuity, and pattern lifting evaluation. However, in the case of Comparative Examples I-1 and I-2, which do not contain the compound represented by Chemical Formula 1 of the present invention, it was confirmed that the coating hardness and discharge continuity decreased significantly.

[0236] Furthermore, in Examples I-9 to I-11, which further contain a silane leveling agent, it was confirmed that even better properties were observed in the evaluation of pattern lifting.

[0237] <Experimental Example II> A-1 Production Example: Synthesis of AgInGaS / GaS core-shell luminescent particles and production of dispersions A mixed solution was prepared by placing 0.0625 mmol of silver iodide (AgI, 99.999%), 1.25 mmol of gallium acetylacetonate (Ga(acac)3, 99.99%), and 1 mmol of sulfur (99.998%) in a three-neck flask with 1.5 mL of 1-dodecanethiol (DDT≧98%) and 5 mL of oleylamine (OLA, 70%). The mixed solution was heated to 120°C to degass it, followed by N2 purging, and then the temperature was raised to the growth temperature of 240°C. The AGS core QD was grown at this temperature for 30 minutes. 0.01 mmol of indium acetate (In(Ac)3, 99.99%) was added to this AGS core solution. The mixed solution was heated to 120°C to degass it, followed by N2 purging, and then the temperature was raised to the growth temperature of 240°C. The AIGS core QD was grown at this temperature for 10 minutes.

[0238] The AIGS core QD was mixed with 7 ml of oleylamine, 0.1 mmol of gallium acetylacetonate (Ga(acac)3, 99.99%), and 0.1 mmol of 1,3-dimethylthiourea, and the mixture was rapidly heated to 230°C. Then, under insert conditions, the temperature was increased by 2°C per minute until it reached 280°C. The solution was cooled back to room temperature, and sulfur compounds that did not participate in the reaction were removed by degassing for 30 minutes. The quantum dots were precipitated in ethanol, purified by centrifugation, and then dried under reduced pressure to obtain AgInGaS / GaS quantum dot powder. The obtained quantum dot powder was mixed with 1,6-hexanediol diacrylate in a 1:1 ratio to prepare an AgInGaS / GaS dispersion.

[0239] Manufacturing Example 2: Synthesis of Compounds F-1 to F-13 Compounds F-1 to F-13 were prepared by known methods, specifically based on the synthesis methods described in 10-2015-0171503, 10-2016-0110987, 10-2016-0110861, 10-2015-0188342, 10-2018-0071309, 10-2018-0013907, etc.

[0240] Examples and Comparative Examples: Production of Photoconversion Ink Compositions The light-converting ink compositions were prepared by mixing the components according to the compositions shown in Tables 4 and 5 below (unit: weight %).

[0241] [Table 4]

[0242] [Table 5]

[0243] -A-1:AgInGaS / GaS dispersion -B-1: 1,6-Hexanediol diacrylate (Shin-Nakamura Chemical Co., Ltd.) -B-2: Polyethylene glycol diacrylate (Shin-Nakamura Chemical Co., Ltd.) -C:TiO2 (Huntsman, TR-88, particle size 220nm) -D: Diphenyl(2,4,6-trimethylbenzoyl)phosphone oxide (Aldrich) -E:SH8400 (Dow Corning Toray Silicone Co., Ltd.) -F-1: A thiol-based additive represented by chemical formula 2-1 (2,2'-thiobis(ethane-1-thiol), TCI Corporation) [Chemical formula 2-1] TIFF0007884464000088.tif9114

[0244] -F-2: Thiol additive represented by chemical formula 2-3 (2,2'-((3-mercaptopropane-1,2-diyl)bis(sulfanediyl))bis(ethane-1-thiol)) [Chemical formula 2-3] TIFF0007884464000089.tif13114

[0245] tetrayltetrakis(sulfanediyl)tetramethanethiol) [Chemical formula 2-4] TIFF0007884464000090.tif18114

[0246] -F-4: Thiol-based additive represented by chemical formula 2-6 (3,3'-thiobis(propane-1,2-dithiol)) [Chemical formula 2-6] TIFF0007884464000091.tif11114

[0247] -F-5: Thiol-based additive represented by chemical formula 2-9 (3,3'-thiobis(2-((2-mercaptoethyl)thio)propane-1-thiol)) [Chemical formula 2-9] TIFF0007884464000092.tif12114

[0248] -F-6: Thiol additive represented by chemical formula 2-10 (2,2'-thiobis(3-((2-mercaptoethyl)thio)propane-1-thiol)) [Chemical formula 2-10] TIFF0007884464000093.tif12114

[0249] -F-7: Thiol additive represented by chemical formula 2-11 (2-((3-mercapto-2-((2-mercaptoethyl)thio)propyl)thio)-3-((2-mercaptoethyl)thio)propane-1-thiol) [Chemical formula 2-11] TIFF0007884464000094.tif17114

[0250] -F-8: Thiol-based additive represented by chemical formula 2-13 (3,6,10,14,17-pentathianonadecane-1,8,12,19-tetrathiol) [Chemical formula 2-13] TIFF0007884464000095.tif11114

[0251] -F-9: Thiol-based additive represented by chemical formula 3-1 ((1,4-dithiane-2,3-diyl)dimethanethiol) [Chemical formula 3-1] TIFF0007884464000096.tif22114

[0252] -F-10: Thiol-based additive represented by chemical formula 3-2 ((1,4-dithiepane-2,3-diyl)dimethanethiol) [Chemical formula 3-2] TIFF0007884464000097.tif23114

[0253] -F-11: Thiol-based additive represented by chemical formula 3-3 ((5-methyl-1,4-dithiane-2,3-diyl)dimethanethiol) [Chemical formula 3-3] TIFF0007884464000098.tif21114

[0254] -F-12: Thiol-based additive represented by chemical formula 3-4 ((1,4-dithiocane-2,3-diyl)dimethanethiol) [Chemical formula 3-4] TIFF0007884464000099.tif21114

[0255] [Chemical formula 3-5] TIFF0007884464000100.tif24114

[0256] -F-14: Ethylene glycol di-3-mercaptopropionate (Sigma-Aldrich) -F-15:1,8-Octanedithiol (TCI) -G:Sumilizer-GP (Sumitomo Chemical Co., Ltd.) Experimental Example II-1: Fabrication of a photoconversion coating layer and evaluation of its photoconversion efficiency The respective photoconversion ink compositions prepared in the examples and comparative examples were coated onto a 5cm x 5cm glass substrate using an inkjet method, and then subjected to a 4000 mJ / cm² test using a 395nm Blue LED lamp under nitrogen conditions. 2 After irradiation, the photoconversion coating layer was fabricated by heating on a hot plate at 180°C for 30 minutes under nitrogen conditions.

[0257] After positioning the manufactured light-converting coating layer on top of a blue light source (XLamp XR-E LED, Royal blue 450, Cree), the light-converting efficiency and blue absorbance were measured using a luminance meter (CAS140CT Spectrometer, Instrument Systems). The results are shown in Table 6 below.

[0258] Experimental Example II-2: Evaluation of Coating Hardness The degree of hardening of the manufactured photoconversion coating layer was measured at a high temperature of 150°C using a hardness tester (HM500; Fischer product), and the coating hardness was evaluated according to the evaluation criteria below. The results are shown in Table 6 below.

[0259] <Criteria for evaluating coating hardness> ○: Surface hardness 50 or more △: Surface hardness between 30 and 50 ×: Surface hardness less than 30

[0260] [Table 6]

[0261] Referring to the experimental results described above, it was confirmed that in the examples containing the structure of Chemical Formula 2 and / or Chemical Formula 3 of the present invention as an additive, the photoconversion efficiency, blue absorbance, and coating hardness were all excellent. In contrast, in Comparative Example II-1, which does not contain the structure of the present invention, and Comparative Examples II-2 and II-3, which contain compounds that remove the structure of Chemical Formula 2 or Chemical Formula 3 of the present invention as additives, the effects in terms of photoconversion efficiency, blue absorbance, and coating hardness were all lower compared to the present invention.

[0262] On the other hand, in Reference Example II-1 and Reference Example II-2, which contain 0.1% by weight of the structure of Chemical Formula 2 and / or Chemical Formula 3 of the present invention relative to the total weight of solids in the photoconversion ink composition, generally excellent properties are observed, but it can be confirmed that the effect is slightly reduced compared to the examples, particularly in terms of coating film hardness. Furthermore, Reference Example II-3, which contains the thiol compound of the present invention but does not contain an antioxidant, also generally exhibits excellent properties, but the effect is slightly reduced compared to the examples, particularly in terms of coating film hardness. Therefore, it can be confirmed that the composition of the examples of this application, which contains both the thiol compound of the structure of Chemical Formula 2 and / or 3 of the present invention and an antioxidant, has extremely excellent properties not only in terms of photoconversion efficiency and blue light absorbance, but also in terms of coating film hardness.

[0263] <Experimental Example III> Production example of A: Synthesis of AgInGaS / GaS core-shell luminescent particles and production of dispersions A mixed solution was prepared by placing 0.0625 mmol of silver iodide (AgI, 99.999%), 1.25 mmol of gallium acetylacetonate (Ga(acac)3, 99.99%), and 1 mmol of sulfur (99.998%) in a three-neck flask with 1.5 mL of 1-dodecanethiol (DDT≧98%) and 5 mL of oleylamine (OLA, 70%). The mixed solution was heated to 120°C and degassed, followed by N2 purging, and then heated to the growth temperature of 240°C. The AGS core QD was grown at this temperature for 30 minutes. 0.01 mmol of indium acetate (In(Ac)3, 99.99%) was added to this AGS core solution. The mixed solution was heated to 120°C and degassed, followed by N2 purging, and then heated to the growth temperature of 240°C. The AIGS core QD was grown at this temperature for 10 minutes.

[0264] The AIGS core QD was mixed with 7 ml of oleylamine, 0.1 mmol of gallium acetylacetonate (Ga(acac)3, 99.99%), and 0.1 mmol of 1,3-dimethylthiourea, and the mixture was rapidly heated to 230°C. Then, under insert conditions, the temperature was increased by 2°C per minute until it reached 280°C. The solution was cooled back to room temperature, and sulfur compounds that did not participate in the reaction were removed by dagassing for 30 minutes. The quantum dots were precipitated in ethanol, purified by centrifugation, and then dried under reduced pressure to obtain AgInGaS / GaS quantum dot powder. The obtained quantum dot powder was mixed with 1,6-hexanediol diacrylate in a 1:1 ratio to prepare an AgInGaS / GaS dispersion.

[0265] E-1~E-13: Additives The additives for the examples and comparative examples of the present invention were prepared by manufacturing them using known methods or by purchasing them from a manufacturer.

[0266] [Chemical formula 4-1] TIFF0007884464000102.tif17114

[0267] 2-(tert-Butylamino)ethyl Methacrylate, TCI [Chemical formula 4-2] TIFF0007884464000103.tif18146

[0268] 2-(Diethylamino)ethyl acrylate, Sigma-Aldrich [Chemical formula 4-3] TIFF0007884464000104.tif18143

[0269] 2-(Diisopropylamino)ethyl Methacrylate, TCI [Chemical formula 4-4] TIFF0007884464000105.tif18114

[0270] N-(4-aminobutyl)acrylamide ([European Journal of Medicinal Chemistry, 2021, vol. 219, art. no. 113432] Synthesis example confirmed as possible) [Chemical Formula 4-5] TIFF0007884464000106.tif17143

[0271] N-(4-azapentyl)acrylamide ([Polymer, 2010, vol. 51, #14, p. 2998-3005] Synthetic example confirmed possible) [Chemical Formula 4-6] TIFF0007884464000107.tif17145

[0272] 2-((2-(dimethylamino)ethyl)(methyl)amino)ethyl acrylate ([Journal of Organic Chemistry USSR (English Translation), 1969, vol. 5, #11, p. 1893-1898][Zhurnal Organicheskoi Khimii, 1969, vol. 5, #11, p. 1947-1952] Synthesis example confirmed possible) [Chemical Formula 4-7] TIFF0007884464000108.tif18114

[0273] N-(2-((2-aminoethyl)(methyl)amino)ethyl)acrylamide (WO2013 / 138783, 2013, A1 Synthesis Example Confirmed Possibly) [Chemical Formula 4-8] TIFF0007884464000109.tif15114

[0274] N-(2-((2-((2-aminoethyl)amino)ethyl)amino)ethyl)acrylamide (Colloids and Surfaces A:Phys.Eng.Asp.,2019,vol.560,p.98-105 synthesis example available) [Chemical formula 4-9] TIFF0007884464000110.tif15114

[0275] N-(2-(2-(2-aminoethoxy)ethoxy)ethyl)acrylamide([Chemical Communications,2008,#11,p.1317-1319]Synthesis example can be confirmed) [Chemical formula 4-10] TIFF0007884464000111.tif15114

[0276] N-(2-(2-(2-(2-aminoethoxy)ethoxy)ethoxy)ethyl)acrylamide(CN104926678,2017, Synthesis example of B can be confirmed) [Chemical formula 4-11] TIFF0007884464000112.tif13114

[0277] 2-((2-(2-(dimethylamino)ethoxy)ethyl)(methyl)amino)ethyl acrylate (Synthesis example of KR2015 / 141448, 2015, A can be verified) [Chemical formula 4-12] TIFF0007884464000113.tif13114

[0278] 2,8,14-trimethyl-5,11-dioxa-2,8,14-triazahexadecan-16-yl acrylate (Synthesis example of KR2015 / 141448,2015,A is available) Examples and Comparative Examples: Production of Photoconversion Ink Compositions Light-converting ink compositions were manufactured by mixing the components according to the compositions shown in Tables 7-8 below (unit: weight %).

[0279] [Table 7]

[0280] [Table 8]

[0281] -A: AgInGaS / GaS QD dispersion based on a manufacturing example -B-1: 1,6-Hexanediol diacrylate (Shin-Nakamura Chemical Co., Ltd.) -B-2: Polyethylene glycol diacrylate (Shin-Nakamura Chemical Co., Ltd.) -C:TiO2 (Huntsman, TR-88, particle size 220nm) -D: Diphenyl(2,4,6-trimethylbenzoyl)phosphone oxide (Aldrich) -E-1:SH8400 (Dow Corning Toray Silicone Co., Ltd.) -E-2: Additive with chemical formula 4-1 -E-3: Additive with chemical formula 4-2 -E-4: Additive with chemical formula 4-3 -E-5: Additives of chemical formula 4-4 -E-6: Additives of chemical formulas 4-5 -E-7: Additives of chemical formulas 4-6 -E-8: Additives of chemical formulas 4-7 -E-9: Additives of chemical formula 4-8 -E-10: Additives of chemical formulas 4-9 -E-11: Additives with chemical formula 4-10 -E-12: Additive with chemical formula 4-11 -E-13: Isodecyl Acrylate (TCI) -F-1: Sumilizer-GP (Sumitomo Chemical Co., Ltd.) Experimental example 1. Manufacturing of the light conversion coating layer and measurement of the light conversion efficiency The respective photoconversion ink compositions prepared in the examples and comparative examples were coated onto a 5cm x 5cm glass substrate using an inkjet method, and then subjected to a 4000 mJ / cm² test using a 395nm Blue LED lamp under nitrogen conditions. 2 After irradiation, the photoconversion coating layer was fabricated by heating on a hot plate at 180°C for 30 minutes under nitrogen conditions.

[0282] After positioning the manufactured light-converting coating layer on top of a blue light source (XLamp XR-E LED, Royal blue 450, Cree), the light conversion efficiency was measured using a luminance meter (CAS140CT Spectrometer, Instrument Systems) with the following formula. The measured results are shown in Table 9 below.

[0283] 2. Lightfastness evaluation The manufactured light-converting coating layer was left in a blue light source (XLamp XR-E LED, Royal blue 450, Cree) for 1 hour, and its light resistance was evaluated by checking the maintenance rate (%) relative to the initial light conversion efficiency. The results are shown in Table 9 below.

[0284] 3.Discharge stability The light-converting ink compositions produced in the examples and comparative examples were subjected to ejection for 30 minutes using a head cartridge with 16 nozzles (FUJIFILM-Dimatix Cartridge Head), and the ejection stability was evaluated according to the following evaluation criteria. The results are shown in Table 9 below.

[0285] <Discharge Stability Evaluation Criteria> ○: Failure to dispense from one or fewer nozzles △: Failure to dispense from 2 to 5 nozzles. X: Failure to dispense from 5 or more nozzles

[0286] [Table 9]

[0287] Through the experimental results described above, the photoconversion ink composition produced with an additive containing one or more compounds represented by chemical formula 4 showed a photoconversion efficiency of 33-34% and lightfastness of 80-82%, which was superior to the comparative example without the additive. In contrast, comparative examples III-1 and III-2, which did not contain the additive containing one or more compounds represented by chemical formula 4, showed a low photoconversion efficiency of 21-22% and lightfastness of 55%, which was also not superior.

[0288] Furthermore, in the evaluation of ejection stability, the light-converting ink composition produced with the light-emitting particles and the additive can be judged to have excellent ejection stability, with non-discharge occurring from one or fewer nozzles. However, in the case of Comparative Examples III-1 and III-2, which do not contain an additive containing one or more compounds represented by the chemical formula 4, non-discharge occurred from five or more nozzles.

[0289] In Reference Example III-1, where an additive containing one or more compounds represented by Chemical Formula 4 was included in an amount of less than 1% by weight relative to the total weight of solids in the photoconversion ink composition, the photoconversion efficiency and lightfastness were low, and in the ejection stability evaluation, non-discharge occurred from 2 to 5 nozzles, indicating normal ejection stability. In Reference Example III-2, where an additive containing one or more compounds represented by Chemical Formula 4 was included in an amount of 15% by weight or more relative to the total weight of solids in the photoconversion ink composition, the ejection stability was normal.

[0290] Therefore, it can be seen that a coating film formed by a photoconversion ink composition containing 1 to 15% by weight of an additive containing one or more compounds represented by chemical formula 4, relative to the total weight of solids in the composition, exhibits improved photoconversion efficiency, lightfastness, and ejection stability.

Claims

1. It comprises luminescent particles, polymerizable monomers and additives, The aforementioned additive contains one or more selected from the following chemical formulas 1 to 4: A photoconversion ink composition in which one or more compounds selected from the above chemical formulas 1 to 4 are contained in an amount exceeding 0.1% by weight but less than 20% by weight, relative to the total weight of the photoconversion ink composition. [Chemical formula 1] (In the above chemical formula 1, R １１ is either a hydrogen or a methyl group; R １２ These are directly bonded or alkylene groups having 1 to 30 carbon atoms; R １３ These are alkylene groups having 3 to 30 carbon atoms, alkenylene groups having 2 to 30 carbon atoms, cycloalkylene groups having 3 to 30 carbon atoms, heterocycloalkylene groups having 3 to 30 carbon atoms, alkylene oxy groups having 1 to 30 carbon atoms, alkylene ester groups having 2 to 31 carbon atoms, arylene groups having 5 to 30 carbon atoms, or arylalkylene groups having 6 to 30 carbon atoms; n1 is an integer between 0 and 100; when n1 is 0, direct concatenation occurs. [Chemical formula 2] (In the above chemical formula 2, R ２１ and R ２２ Each of these is independently a divalent to tetravalent hydrocarbon group having 2 carbon atoms; R ２３ ~R ２６ Each of these independently consists of hydrogen, a substituted or unsubstituted C1-C5 alkyl group, a thiol group, or And R ２７ This is a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms; n2 is an integer from 1 to 5, and when n2 is 2 or more, a plurality of Rs ２２ , R ２５ and R ２６ may each independently be different from each other. ) [Chemical formula 3] (In the above chemical formula 3, R ２８ and R ２９ These are, independently, a hydrogen or a methyl group; m2 is an integer from 1 to 3, and if m2 is 2 or greater, multiple R ２９ (They may be different from each other.) [Chemical formula 4] (In the above chemical formula 4, R ４１ is a hydrogen or methyl group, X ４ is O or -NH-, R ４３ These are directly bonded or alkylene groups having 1 to 10 carbon atoms. R ４４ and R ４５ Each of these is independently hydrogen, a C1-C20 alkyl group, an allyl group, or a cycloalkyl group. R ４２ These are substituted or unsubstituted alkylene groups, arylene groups, alkylarylene groups, and alkylarylene groups having 1 to 20 carbon atoms. And, At this time, R ４６ , R ４８ , R ４９ , R ４１０ , R ４１１ , R ４１３ and R ４１４ Each of these is independently a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms. R ４７ and R ４１２ Each of these is independently a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms. l ４ , m ４ and n ４ These are each independently 1 to 3. However, this excludes photoconversion ink compositions containing 2-(tert-Butylamino)ethyl Methacrylate.

2. The photoconversion ink composition according to claim 1, further comprising a silane coupling agent.

3. The photoconversion ink composition according to claim 2, wherein the silane coupling agent has at least one organic functional group selected from the group consisting of epoxy groups, (meth)acrylooxy groups, mercapto groups, and amino groups.

4. The photoconversion ink composition according to claim 1, wherein the polymerizable monomer comprises a compound represented by the following chemical formula 5. [Chemical formula 5] (In the above chemical formula 5, R ５１ These are substituted or unsubstituted C1-C20 alkylene groups, substituted or unsubstituted C3-C10 cycloalkylene groups, substituted or unsubstituted C5-C20 arylene groups, substituted or unsubstituted C2-C15 heteroarylene groups, substituted or unsubstituted C6-C30 arylalkylene groups, substituted or unsubstituted C3-C30 heteroarylalkylene groups, substituted or unsubstituted C2-C10 alkenylene groups, or substituted or unsubstituted C2-C10 alkylylene groups; R ５２ and R ５３ Each of these is independently either a hydrogen atom or a methyl group; m5 is an integer between 1 and 15.

5. The photoconversion ink composition according to claim 4, wherein the polymerizable monomer further comprises at least one of monofunctional monomers, difunctional monomers, and polyfunctional monomers.

6. The photoconversion ink composition according to claim 4, wherein the compound represented by chemical formula 5 comprises one or more selected from the group consisting of 1,6-hexanediol diacrylate, polyethylene glycol diacrylate, 2-hydroxy-3-methacrylate, 1,9-bisacryloyloxynonane, and tripropylene glycol diacrylate.

7. The photoconversion ink composition according to claim 1, further comprising a compound represented by chemical formula 6. [Chemical formula 6] (In the above chemical formula 6, Z is a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C1-C30 cycloalkyl group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C2-C30 alkenyl group, a substituted or unsubstituted C2-C30 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C2-C30 alkyl ester group, a substituted or unsubstituted C4-C30 heteroaryl group, a substituted or unsubstituted C1-C30 thioester group, a substituted or unsubstituted C1-C30 silyl ester group, a thioether group, or a silyl group; R ６７ and R ６８ Each of these independently consists of a directly bonded, substituted, or unsubstituted alkylene group having 1 to 30 carbon atoms, -OR ６９ -, -OC(=O)R ６１０ -, - (OCH ２ CH ２ ) ｐ - or - (OCH ２ CH ２ CH ２ ) ｑ - and; Q １ and Q ２ Each of these is independently a direct bond, an oxygen atom, a sulfur atom, or -NH-; D is an oxygen atom, a sulfur atom, or =NH; R ６９ This is a substituted or unsubstituted alkylene group having 1 to 30 carbon atoms; R ６１０ This is a substituted or unsubstituted alkylene group having 4 to 30 carbon atoms; p and q are each independent integers between 1 and 150.

8. The photoconversion ink composition according to claim 1, further comprising an antioxidant.

9. The photoconversion ink composition according to claim 8, wherein the antioxidant comprises at least one of the antioxidants comprising a phenolic compound and a phosphorus compound, and an antioxidant comprising a phenolic compound and a sulfur compound.

10. The photoconversion ink composition according to claim 1, further comprising one or more selected from the group consisting of scattering particles, photopolymerization initiators, additives, and solvents.

11. The aforementioned scattering particles are Al ２ O ３ SiO ２ ZnO, ZrO ２ , BaTiO ３ , TiO ２ Ta ２ O ５ Ti ３ O ５ , ITO, IZO, ATO, ZnO-Al, Nb ２ O ３ The photoconversion ink composition according to claim 10, comprising one or more selected from the group consisting of SnO and MgO.

12. The photoconversion ink composition according to claim 1, which is solvent-free and does not contain any solvents.

13. A photoconversion laminated substrate manufactured using the photoconversion ink composition described in any one of claims 1 to 12.

14. A backlight unit comprising the optical conversion laminated substrate described in claim 13.

15. A light-converting pixel substrate manufactured using the light-converting ink composition described in any one of claims 1 to 12.

16. An image display device comprising the backlight unit described in claim 14.

17. An image display device comprising the light conversion pixel substrate described in claim 15.

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