Quantum dots, quantum dot dispersion, photoconvertible curable composition, cured film formed using the composition, and image display device including the cured film.

Abstract

To provide a quantum dot and a photoconversion curable composition containing the same.SOLUTION: The present invention provides a quantum dot that has a ligand layer on a surface thereof, and the ligand layer contains a metal complex which contains a thiol-based compound and any one metal selected from a group consisting of Zn, Mg, Al and In; and dispersion liquid of the quantum dot and a photoconversion curable composition, any of which contains the quantum dot. The quantum dot and the photoconversion curable composition containing the same according to the present invention are excellent in viscosity stability, high temperature and high humidity resistance, adhesiveness, and inkjet process characteristics; can be effectively applied to various uses such as a quantum dot film, a quantum dot light-emitting diode, a color filter, and a photoconversion laminated substrate; and thereby can provide a high-quality image display apparatus.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to quantum dots, a quantum dot dispersion liquid containing the quantum dots, a photo-convertible curable composition, a cured film formed using the photo-convertible curable composition, and an image display device including the cured film.

Background Art

[0002] Quantum dots have high luminescence and a narrow emission spectrum, and the emission wavelength can be adjusted at one excitation wavelength. Because of the unique properties of quantum dots that are stable to light, many studies have been conducted for use in important application fields such as biological imaging, energy conversion, and lighting (LED) until recently.

[0003] Such quantum dots are substances that are extremely sensitive to the surface state, and oxidation occurs from the surface due to the dispersed solvent or the surrounding environment. Eventually, the luminous efficiency decreases rapidly. For various applications of quantum dots, they must be dispersed in various solvents other than the initially dispersed organic solvent, or specific functional groups must be formed on the surface. However, these processes damage the surface of the quantum dots, ultimately leading to a problem of a decrease in luminous efficiency.

[0004] Many attempts have been made to overcome such problems, and currently, various methods have been proposed. One of them is the ligand exchange method of substituting the organic substances present on the surface of quantum dots with molecules having desired functional groups. This method is a method of substituting the organic molecules present on the surface of quantum dots with organic molecules suitable for application, but since it directly affects the surface of quantum dots, it has a demerit of causing a fatal problem in luminous efficiency.

[0005] Korean Published Patent No. 10-2018-0002716 and Korean Registered Patent No. 10-1628065 disclose quantum dots containing ligands arranged on the surface, but they have problems such as low compatibility and dispersibility, insufficient adhesion, damage to the quantum dots over time in high temperature and high humidity environments leading to a decrease in the properties of the optical sheet, and insufficient viscosity stability making them unsuitable for inkjet printing. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Korean Published Patent Publication No. 10-2018-0002716 [Patent Document 2] Korean Registered Patent Publication No. 10-1628065 [Overview of the project] [Problems that the invention aims to solve]

[0007] The present invention aims to provide quantum dots for photoconversion curable compositions that exhibit excellent light resistance, viscosity stability, resistance to high temperature and humidity, adhesion, and inkjet process characteristics.

[0008] Furthermore, the present invention aims to provide a quantum dot dispersion containing the aforementioned quantum dots and a photoconvertible curable composition.

[0009] Furthermore, the present invention aims to provide a cured film formed using the photo-curable composition and an image display device containing the cured film. [Means for solving the problem]

[0010] The present invention provides a quantum dot having a ligand layer on its surface, wherein the ligand layer comprises a metal complex consisting of a thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In.

[0011] Furthermore, the present invention provides a quantum dot dispersion containing the quantum dots and a photoconvertible curable composition.

[0012] Furthermore, the present invention provides a cured film formed using the photo-curable composition and an image display device containing the cured film. [Effects of the Invention]

[0013] The quantum dots according to the present invention have improved compatibility and excellent viscosity stability and resistance to high temperature and humidity by having a ligand layer containing a metal complex consisting of a thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In. This prevents a decrease in quantum efficiency and results in excellent optical properties.

[0014] Furthermore, the quantum dots and the photo-curable compositions containing them offer excellent viscosity stability, resistance to high temperatures and humidity, adhesion, and inkjet process characteristics, making them effectively applicable to a variety of uses such as quantum dot films, quantum dot light-emitting diodes, color filters, and photo-converting laminated substrates, thereby enabling the provision of high-quality image display devices. [Modes for carrying out the invention]

[0015] The present invention provides a quantum dot having a ligand layer on its surface, wherein the ligand layer comprises a metal complex consisting of a thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In.

[0016] The quantum dots according to the present invention are characterized by having a metal complex consisting of a thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In in the ligand layer, thereby improving the high temperature and humidity resistance and adhesion of the photoconvertible curable composition containing them, and by having excellent viscosity stability, making them suitable for use in inkjet processes.

[0017] The present invention also provides a quantum dot dispersion liquid containing the quantum dots and at least one of a photopolymerizable compound and a solvent.

[0018] Furthermore, the present invention provides a photo-convertible curable composition containing the quantum dots or the quantum dot dispersion liquid, a cured film formed using the same, and an image display device including the cured film.

[0019] Hereinafter, the configuration of the present invention will be described in detail. <Quantum dots> In the present invention, the quantum dots are those that emit spontaneous light by a light source and are used to generate light in the visible light and infrared regions. The quantum dots are substances having a crystal structure of several nanosizes and may be composed of several hundreds to several thousands of atoms. Atoms form molecules, and molecules form aggregates of small molecules called clusters to form nanoparticles. Usually, when such nanoparticles particularly have semiconductor characteristics, they are called quantum dots. The quantum dots of the present invention are not particularly limited as long as they conform to such a concept. When an object becomes smaller than the nanosize, a quantum confinement effect, which is a phenomenon in which the energy band gap of the object becomes larger, appears. When the quantum dots receive energy from the outside and reach an excited state, they emit energy corresponding to the energy band gap by themselves and can emit spontaneous light.

[0020] The quantum dots according to the present invention have a ligand layer on the surface, and the ligand layer contains a metal complex composed of any one metal selected from the group consisting of a thiol-based compound and Zn, Mg, Al, and In. Thereby, the surface of the quantum dots is protected, the oxidation stability is improved, the reduction of the quantum efficiency is prevented, and the reliability can be improved.

[0021] The thiol-based compound is a compound having a thiol group at the terminal, and preferably may be a compound represented by the following Chemical Formula 1. [Chemical Formula 1] [Chemistry]

[0022] In the above Chemical Formula 1, L may be a linear or branched alkanediyl group having 1 to 20 carbon atoms. X may be -OC(=O)-, -C(=O)O-, -C(=O)NH-, or -HNC(=O)-. Y may be a linear or branched alkanediyl group having 1 to 20 carbon atoms, [Chemistry] and so on. n may be an integer from 1 to 15. m may be an integer from 1 to 10. Z may be an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an aromatic hydrocarbon group having 6 to 30 carbon atoms, or a photopolymerizable reactive group having 2 to 20 carbon atoms. The photopolymerizable reactive group may be an alkenyl group, an alkynyl group, or an acrylate group.

[0023] In one embodiment of the present invention, the thiol compound may be one or more selected from the compounds represented by the following Chemical Formulas 1-1 to 1-3. [Chemical Formula 1-1] [Chemistry] [Chemical Formula 1-2] [Chemistry] [Chemical Formula 1-3] [[ID=5T]] [Chemistry]

[0024] The metal complex comprising the thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In may be a compound represented by the following chemical formula 2. [Chemical formula 2] [ka]

[0025] In the aforementioned chemical formula 2, M may be Zn, Mg, Al, or In. d may be 2 or 3. L may be a linear or branched alkanediyl group having 1 to 20 carbon atoms. X may also be -OC(=O)-, -C(=O)O-, -C(=O)NH-, or -HNC(=O)-. Y is a linear or branched alkanediyl group having 1 to 20 carbon atoms. [ka] That's fine. n can be an integer between 1 and 15. m can be an integer between 1 and 10. Z may be an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an aromatic hydrocarbon group having 6 to 30 carbon atoms, or a photopolymerization-reactive group having 2 to 20 carbon atoms. The photopolymerization-reactive group may be an alkenyl group, an alkynyl group, or an acrylate group.

[0026] The compound represented by the aforementioned chemical formula 2 is characterized by containing one or more compounds selected from the compounds represented by the following chemical formulas 2-1 to 2-12. [Chemical formula 2-1] [ka] [Chemical formula 2-2] [ka] [Chemical Formula 2-3]

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[0027] The metal complex of the present invention, comprising the thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In, can act as an organic ligand, coordinating to the surface of quantum dots and stabilizing them. Typically, manufactured quantum dots have a ligand layer on their surface, and the ligand layer immediately after manufacturing consists of oleic acid, lauric acid, 2-(2-methoxyethoxy)acetic acid, 2-[2-(2-methoxyethoxy)ethoxy]acetic acid, and mono-[2-(2-methoxyethoxy)-ethyl] succinate. In this case, compared to the quantum dots of the present invention that contain a metal complex of the thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In in the ligand layer, the surface protection effect may be reduced due to non-binding defects on the quantum dot surface caused by the weaker bonding force between the ligand layer and the quantum dot. Furthermore, oleic acid disperses well in highly volatile organic compounds (VOCs), such as unsaturated hydrocarbon solvents like n-hexane, chloroform, and aromatic solvents like benzene, but its dispersibility in solvents like PGMEA is poor.

[0028] The quantum dots according to the present invention, by including a metal complex in the ligand layer consisting of the thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In, have improved high temperature and humidity resistance and adhesion of the photoconversion curable composition containing them, and have excellent viscosity stability, making them suitable for use in inkjet processes.

[0029] In some examples, the quantum dot according to the present invention comprises a metal complex in the ligand layer consisting of the thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In, and may further contain oleic acid, lauric acid, 2-(2-methoxyethoxy)acetic acid, 2-[2-(2-methoxyethoxy)ethoxy]acetic acid, and mono-[2-(2-methoxyethoxy)-ethyl] succinate, etc.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] According to one embodiment, the quantum dot has a core-shell structure, the core comprises one or more compounds consisting of two or more combinations of In, P, Zn, Ga, Cd, Se, S, Te, Pb, Ag, Hg, N, As, and O, and the shell may contain one or more compounds consisting of two or more combinations of In, P, Zn, Ga, Cd, Se, S, Te, Pb, Hg, N, As, O, Mn, and Sr.

[0037] Specifically, the core includes 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, AgInGaS, HgS, HgSe, HgTe, GaN, GaP, GaAs, InGaN, InAs, and ZnO, and the shell includes ZnS, ZnSe, ZnTe, ZnO, CdS, CdSe, CdTe, CdO, In It may contain one or more elements selected from the group consisting of P, InS, GaP, GaN, GaO, GaS, InZnP, InGaP, InGaN, InZnSCdSe, PbS, TiO, SrSe, and HgSe, and preferably one or more elements selected from the group consisting of InP / ZnS, InP / ZnSe, InP / GaP / ZnS, InP / ZnSe / ZnS, InP / ZnSeTe / ZnS, and InP / MnSe / ZnS, but is not limited thereto.

[0038] Generally, quantum dots can be manufactured by wet chemical processes, metal-organic chemical vapor deposition (MOCVD), or molecular beam epitaxy (MBE).

[0039] The quantum dots according to the present invention are synthesized by a wet chemical process.

[0040] The aforementioned wet chemical process involves adding a precursor substance to an organic solvent to grow particles. As the crystals grow, the organic solvent naturally coordinates to the surface of the quantum dot crystals, acting as a dispersant and regulating crystal growth. This process allows for easier and less expensive control of quantum dot particle size growth compared to vapor deposition methods such as organometallic chemical deposition or molecular beam epitaxy.

[0041] When quantum dots are manufactured using a wet chemical process, organic ligands are used to prevent aggregation of the quantum dots and to control the particle size of the quantum dots to the nanoscale. Oleic acid is commonly used as such an organic ligand.

[0042] In one embodiment of the present invention, the oleic acid used in the manufacturing process of the quantum dots is replaced by a ligand exchange method using a metal complex comprising the thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In.

[0043] The ligand exchange is carried out by adding the organic ligand to be replaced, i.e., the compound represented by chemical formula 2, to a dispersion containing the original organic ligand, i.e., quantum dots having oleic acid, and stirring the mixture at room temperature to 200°C for 30 minutes to 3 hours to obtain quantum dots to which a metal complex consisting of a thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In is bound. If necessary, an additional step may be taken to separate and purify the quantum dots to which the metal complex consisting of the thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In is bound.

[0044] As described above, quantum dots according to one embodiment of the present invention have the advantage of being able to be manufactured at room temperature under simple stirring conditions using an organic ligand exchange method, and thus enabling mass production.

[0045] Furthermore, the quantum dots according to one embodiment of the present invention can maintain a quantum efficiency of approximately 90% or more compared to the initial quantum efficiency even after 15 days, allowing for stable long-term storage and commercialization for a variety of applications.

[0046] <Quantum dot dispersion> A quantum dot dispersion according to one embodiment of the present invention is characterized by containing the above-mentioned quantum dots and one or more of a photopolymerizable compound and a solvent.

[0047] Quantum dots A quantum dot dispersion according to one embodiment of the present invention is characterized by containing the quantum dots described above. The description of the quantum dots is the same as the description of <quantum dots> described above.

[0048] The quantum dots are present in an amount of 10 to 90% by weight, preferably 20 to 80% by weight, and more preferably 30 to 70% by weight, relative to the total weight of the quantum dot dispersion. When the quantum dots are within this range, there is an advantage in that the luminescence efficiency is excellent and the reliability of the photoconversion coating layer produced using them is excellent. When the quantum dots are within the above range, the dispersibility characteristics of the quantum dots are good, the coating or jetting characteristics are excellent, and the optical properties and reliability are excellent, which is preferable.

[0049] photopolymerizable compound The aforementioned photopolymerizable compound improves the dispersibility of quantum dots.

[0050] The photopolymerizable compound can be a monofunctional monomer, a difunctional monomer, or a polyfunctional monomer, and preferably, a monomer with two or more functions can be used.

[0051] The type of monofunctional monomer is not particularly limited, and examples include nonylphenylcarbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexylcarbitol acrylate, and 2-hydroxyethyl acrylate.

[0052] The type of the aforementioned difunctional monomer is not particularly limited, and examples include 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, bis(acryloyloxyethyl) ether of bisphenol A, and 3-methylpentanediol di(meth)acrylate.

[0053] 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.

[0054] Of these, polyfunctional monomers with two or more functions are preferably used.

[0055] When the quantum dot dispersion according to the present invention contains the photopolymerizable compound, the amount of the photopolymerizable compound is 10 to 90% by weight, preferably 20 to 80% by weight, and more preferably 30 to 70% by weight, relative to the total weight of the quantum dot dispersion. When the photopolymerizable compound is contained within the above range, the dispersibility characteristics of the quantum dots are good, the coating or jetting characteristics are excellent, and the optical properties and reliability are excellent, which is preferable.

[0056] In the present invention, the description of the photopolymerizable compound applies equally to the photopolymerizable compound included in the photoconversion curable composition described later.

[0057] solvent The solvent can be any solvent commonly used in the field, without any particular limitations, as long as it is effective in dissolving the other components contained in the quantum dot dispersion. The solvent can be, but is not limited to, one or more selected from ethers, acetates, aromatic hydrocarbons, ketones, alcohols, esters, and amides.

[0058] The aforementioned ether solvents are, specifically, ethylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, and ethylene glycol monobutyl ether; Propylene glycol monoalkyl ethers such as propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, and propylene glycol monobutyl ether; Examples include diethylene glycol dialkyl ethers such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, and diethylene glycol dibutyl ether.

[0059] The acetate solvents mentioned above specifically include alkylene glycol alkyl ether acetates such as methyl cellosolve acetate, ethyl cellosolve acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, and propylene glycol monopropyl ether acetate; Examples include alkoxyalkyl acetates such as methoxybutyl acetate, methoxypentyl acetate, and n-pentyl acetate.

[0060] The aforementioned aromatic hydrocarbon solvents specifically include benzene, toluene, xylene, and mesitylene.

[0061] The ketone solvents mentioned above specifically include methyl ethyl ketone, acetone, methyl amyl ketone, methyl isobutyl ketone, and cyclohexanone.

[0062] The aforementioned alcoholic solvents include, specifically, ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol, and glycerin.

[0063] The aforementioned ester solvents specifically include cyclic esters such as γ-butyrolactone; ethyl 3-ethoxypropionate, methyl 3-methoxypropionate, and ethyl 3-ethoxypropionate.

[0064] The aforementioned amide solvents specifically include N,N-dimethylformamide, N,N-dimethylacetamide, and N-methylpyrrolidone.

[0065] These solvents can be used individually or in combination of two or more.

[0066] When the quantum dot dispersion according to the present invention contains the solvent, the solvent content is 10 to 90% by weight, preferably 20 to 80% by weight, and more preferably 30 to 70% by weight, relative to the total weight of the quantum dot dispersion. When the solvent is contained within the above range, the dispersibility characteristics of the quantum dots are good, the coating or jetting characteristics are excellent, and the optical properties and reliability are excellent, which is preferable.

[0067] In the present invention, the description of the solvent also applies to the solvent contained in the photo-curable composition described later.

[0068] <Photo-curable composition> A photo-curable composition according to one embodiment of the present invention contains the above-described quantum dots and may further contain, as necessary, one or more components known in the art, such as scattering particles, photopolymerizable compounds, photopolymerization initiators, antioxidants, and solvents. The description of the solvent is the same as the description of the <quantum dot dispersion> described above.

[0069] The photoconvertible curable composition according to one embodiment of the present invention may be solvent-free from the viewpoint of continuous processability. Such a solvent-free photoconvertible curable composition has high dispersibility and viscosity stability and is suitable for continuous processes using an inkjet method.

[0070] The method for producing the photo-curable composition of the present invention is not particularly limited, and methods known in the art can be used.

[0071] Quantum dots A photo-curable composition according to one embodiment of the present invention is characterized by containing the above-described quantum dots. Furthermore, in order to improve dispersibility, a quantum dot dispersion can be prepared first, and then mixed with the remaining components to produce the photo-curable composition. The description of the quantum dots and quantum dot dispersion is the same as the description of <quantum dots> and <quantum dot dispersion> above.

[0072] The content of the quantum dots may be 1 to 60% by weight, preferably 5 to 55% by weight, and more preferably 10 to 50% by weight, based on the total solid weight of the photoconvertible curable composition. A photoconvertible curable composition containing the quantum dots within the above content range is preferable because it can emit light of high color, have increased luminescence efficiency and improved color reproducibility.

[0073] scattering particles The scattering particles can be made of ordinary inorganic materials, and preferably include metal oxides with an average particle size of 30 to 1000 nm.

[0074] The metal oxide may, but is not limited to, an oxide containing one or more metals 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.

[0075] Specifically, it may be one or more selected from the group consisting of Al2O3, SiO2, ZnO, ZrO2, BaTiO3, Ba2TiO4, TiO2, Ta2O5, Ti3O5, ITO, IZO, ATO, ZnO-Al, Nb2O3, SnO, MgO, and combinations thereof. From the viewpoint of scattering properties, it is preferable to include TiO2, and the TiO2 may be of the rutile type. If necessary, materials surface-treated with compounds having unsaturated bonds, such as acrylates, can also be used.

[0076] The photoconvertible curable composition according to the present invention is preferable because, when it contains scattering particles, the scattering particles can increase the path of light spontaneously emitted from quantum dots, thereby improving the overall light efficiency in the color filter.

[0077] The aforementioned scattering particles have a density of 2.0 to 4.0 g / cm³. 3 It may be, preferably 2.0 to 3.5 g / cm³ 3 It may be, and more preferably, 2.1 to 3.4 g / cm³. 3 This may also be the case. When the scattering particles satisfy the density range, it is possible to provide a photo-curable composition in which the scattering particles, as a scattering body, have a sufficient backlight light scattering effect and maintain an excellent light conversion rate, while having a low density that prevents settling in the solvent, excellent redispersibility, and excellent inkjet processability and storage stability.

[0078] The scattering particles may have an average particle size of 30 to 1000 nm, preferably 100 to 500 nm, more preferably 100 to 350 nm, and even more preferably in the range of 160 to 330 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 may sink into the composition or a uniform quality self-luminous layer surface cannot be obtained, so the particle size should be adjusted appropriately within the above range.

[0079] Furthermore, the scattering particles may be hollow particles, and when the inner diameter of the scattering particles is A and the diameter of the primary particles is B, the A / B value may be 0.3 to 0.95, preferably 0.4 to 0.8. When the scattering particles satisfy the range of the A / B value, it is possible to provide a photoconvertible curable composition that maintains a high photoconversion rate, has low density so that it does not settle in the solvent, has excellent redispersibility, excellent inkjetability and storage stability, and can achieve high film hardness after post-bake heat treatment.

[0080] The scattering particles further contain silica. The content of the metal oxide may be 90.0 to 99.0 mol% and the content of the silica may be 0.3 to 10 mol% relative to 100 mol% of the total scattering particles, preferably the content of the metal oxide may be 92 to 98 mol% and the content of the silica may be 0.5 to 8.0 mol%. When scattering particles satisfying the content of the metal oxide and silica are included, it is possible to provide a photo-curable composition that maintains an excellent photoconversion rate, has a low density that does not settle in the solvent, has excellent redispersibility characteristics, and can provide good continuous jetting performance, suppression of nozzle clogging, improvement of non-uniformity in inkjet processes, and excellent storage stability.

[0081] When the photoconvertible curable composition according to the present invention contains scattering particles, the content of the scattering particles may be 0.5 to 35% by weight, preferably 0.5 to 15% by weight, and more preferably 3 to 10% by weight, based on the total weight of the solids of the photoconvertible curable composition. When the scattering particles are included within the above content range, it is preferable because it is possible to provide a photoconvertible curable composition that exhibits excellent luminescence efficiency and light retention, has excellent surface hardness with no crack formation, has good diffusivity and sensitivity, as well as pattern stability, development speed, solvent resistance and outgassing reduction effect.

[0082] photopolymerizable compound The photopolymerizable compound can be a monofunctional monomer, a difunctional monomer, or a polyfunctional monomer, and preferably, a monomer with two or more functions can be used.

[0083] The type of monofunctional monomer is not particularly limited, and examples include nonylphenylcarbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexylcarbitol acrylate, and 2-hydroxyethyl acrylate.

[0084] The type of the aforementioned difunctional monomer is not particularly limited, and examples include 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, bis(acryloyloxyethyl) ether of bisphenol A, and 3-methylpentanediol di(meth)acrylate.

[0085] 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.

[0086] Of these, polyfunctional monomers with two or more functions are preferably usable, and 1,6-hexanediol di(meth)acrylate is even more preferable in terms of heat resistance, volatility, viscosity, and jetting properties.

[0087] When the photo-curable composition according to the present invention contains a photopolymerizable compound, the content of the photopolymerizable compound may be 20 to 80% by weight, preferably 30 to 70% by weight, based on the total solid weight of the photo-curable composition. When the photopolymerizable compound is contained within the above content range, the effect of good intensity and smoothness of the pixel portion can be obtained without a decrease in light sensitivity.

[0088] Photopolymerization initiator The photopolymerization initiator is a compound for initiating the polymerization of the photopolymerizable compound described above, and is not particularly limited in the present invention, but 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, acylphosphine compounds, and thioxanthone compounds, and it is even more preferable to use one or more compounds selected from the group consisting of oxime compounds and acylphosphine compounds.

[0089] Examples of acetophenone compounds include diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethylketal, 2-hydroxy-1-[4-(2-hydroxyethoxy)phenyl]-2-methylpropan-1-one, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butan-1-one, and oligomers of 2-hydroxy-2-methyl[4-(1-methylvinyl)phenyl]propan-1-one, with 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butan-1-one being preferred.

[0090] Examples of benzophenone compounds include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoisobutyl ether. Examples of benzophenone compounds include benzophenone, o-benzoyl methyl benzoate, 4-phenylbenzophenone, 4-benzoyl-4'-methyldiphenyl sulfide, 3,3',4,4'-tetra(t-butylperoxycarbonyl)benzophenone, and 2,4,6-trimethylbenzophenone. Examples of thioxanthone compounds include 2-isopropylthioxanthone, 4-isopropylthioxanthone, 2,4-diethylthioxanthone, 2,4-dichlorothioxanthone, and 1-chloro-4-propoxythioxanthone.

[0091] Examples of triazine compounds include 2,4-bis(trichloromethyl)-6-(4-methoxyphenyl)-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-(4-methoxynaphthyl)-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-(4-methoxystyryl)-1,3,5-triazine, and 2,4-bis(trichloromethyl)-6-[2-(5-methylfuran-2-yl)ethyl] Examples include [nyl]-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-[2-(furan-2-yl)ethenyl]-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-[2-(4-diethylamino-2-methylphenyl)ethenyl]-1,3,5-triazine, and 2,4-bis(trichloromethyl)-6-[2-(3,4-dimethoxyphenyl)ethenyl]-1,3,5-triazine.

[0092] Examples of the biimidazole compounds include 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetrakis(4-ethoxycarbonylphenyl)-1,2'-biimidazole, 2,2'-bis(2-bromophenyl)-4,4',5,5'-tetrakis(4-ethoxycarbonylphenyl)-1,2'-biimidazole, 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole, and 2,2'-bis(2,4-dichlorophenyl)-4,4',5,5'-tetraphenyl Examples include phenyl-1,2'-biimidazole, 2,2'-bis(2,4,6-trichlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole, 2,2'-bis(2-bromophenyl)-4,4,5,5'-tetraphenyl-1,2'-biimidazole, 2,2'-bis(2,4,4-dibromophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole, and 2,2'-bis(2,4,6-tribromophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole.

[0093] Examples of the aforementioned oxime compounds include 2-(O-benzoyloxime)-1-[4-(phenylthio)phenyl]-1,2-octanedione, 1-(4-methylsulfanylphenyl)butane-1,2-butane-2-oxime-O-acetate, 1-(4-methylsulfanylphenyl)butane-1-one oxime-O-acetate, hydroxyimino(4-methylsulfanylphenyl)ethyl acetate-O-acetate, and hydroxyimino(4-methylsulfanylphenyl)ethyl acetate-O-benzoate. Typical commercially available products include Irgacure OXE-01 and OXE-02 from BASF.

[0094] Examples of the aforementioned acylphosphine compounds include 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,6-dimethylbenzoyldiphenylphosphine oxide, 2,6-dimethoxybenzoyldiphenylphosphine oxide, 2,6-dichlorobenzoyldiphenylphosphine oxide, 2,3,5,6-tetramethylbenzoyldiphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide, 2,4,6-trimethylbenzoylphenylphosphine methyl ester, 2,4,6-trimethylbenzoylphenylphosphine ethyl ester, and 2,4,6-trimethylbenzoylphenylphosphine phenyl ester. A typical commercially available product is Omnirad TPO-H.

[0095] Examples of the thioxanthone compounds include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, isopropylthioxanthone, and 2,4-diisopropylthioxanthone.

[0096] When the photo-curable composition according to the present invention contains a photopolymerization initiator, the content of the photopolymerization initiator may be 0.2 to 15% by weight, preferably 0.5 to 10% by weight, based on the total weight of solids of the photo-curable composition. When the photopolymerization initiator is included within the above content range, the photo-curable composition becomes highly sensitive, which has the advantage of improving the strength of the pixel portion formed using the composition and the smoothness of the surface of the pixel portion.

[0097] Antioxidant The antioxidant may include one or more selected from phosphorus-based antioxidants, phenol-based antioxidants, and sulfur-based antioxidants.

[0098] As the phosphorus-based antioxidant, one or more can be selected and used from, for example, tris(2,4-di-tert-butylphenyl)phosphite (Songnox 1680), tris(nonylphenyl)phosphite (TNPP), and di-(2,4-di-tert-butylphenyl)pentaerythritol diphosphite.

[0099] Examples of the phenolic antioxidants include 2,6-di-tert-butyl-4-methylphenol (BHT), thiodiethylenebis[2-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (Songnox1035), octadecyl-3-(3,5-di-tert-butyl-4- One or more of the following can be selected and used: octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (Songox 1076), tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane (Songox 1010), etc.

[0100] As the sulfur-based antioxidant, one or more can be selected and used from, for example, dilauryl-3,3'-thiodipropionate, dimyristyl-3,3'-thiodipropionate, distearyl-3,3'-thiodipropionate, pentaerythritol tetrakis(3-laurylthiopropionate), etc.

[0101] Examples of commercially available antioxidants include IRGANOX1035, IRGANOX1081, IRGANOX1425, IRGANOX1726 (all manufactured by BASF), and Sumilizer GP (manufactured by Sumitomo Chemical Co., Ltd.). The antioxidants exemplified above can be used individually or in combination of two or more.

[0102] If the photocurable composition according to the present invention contains an antioxidant, the content of the antioxidant may be 0.1 to 25% by weight, preferably 0.1 to 10% by weight, relative to the total solid weight of the photocurable composition. It is preferable that the antioxidant is included within the above content range, as this improves the flatness, adhesion, and photoconversion efficiency of the photocurable composition.

[0103] additives A photocurable composition according to one embodiment of the present invention may further contain additives such as adhesion promoters and surfactants to enhance coating properties or adhesion, if necessary.

[0104] The adhesion promoter can be added to enhance adhesion to the substrate and may include, but is not limited to, a silane coupling agent having a reactive substituent selected from the group consisting of a carboxyl group, a methacryloyl group, an isocyanate group, an epoxy group, and combinations thereof. For example, the silane coupling agent can be trimethoxysilylbenzoic acid, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, vinyltrimethoxysilane, γ-isocyanatetopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, or β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, which can be used alone or in combination of two or more.

[0105] The surfactant can be added to further improve the film-forming properties of the photosensitive resin composition, and fluorine-based surfactants or silicone-based surfactants are preferably used.

[0106] Examples of commercially available silicone-based surfactants include DC3PA, DC7PA, SH11PA, SH21PA, and SH8400 from Dow Corning Toray Silicone, and TSF-4440, TSF-4300, TSF-4445, TSF-4446, TSF-4460, and TSF-4452 from GE Toshiba Silicone.

[0107] Examples of the fluorine-based surfactants include commercially available products such as MegaPeace F-470, F-471, F-475, F-482, and F-489 from Dainippon Ink and Chemicals, Inc. The surfactants exemplified above can be used individually or in combination of two or more.

[0108] The photoconvertible curable composition produced in this manner can be preferably used in the manufacture of cured films such as color filters and photoconvertible laminate substrates, and image display devices containing the same.

[0109] <Cured film> The present invention provides a cured film formed using the photo-curable composition, wherein the cured film may be a color filter or a photo-curable laminate substrate.

[0110] Color filter The pattern forming method for the color filter of the present invention can utilize methods known in the art. To give one example, the pattern formation method is: a) A step of applying a photocurable composition to a substrate, b) Pre-bake step, c) A step of applying a photomask to the obtained coating and irradiating it with active light to cure the exposed area, d) A developing step in which an alkaline aqueous solution is used to dissolve the unexposed areas, e) may include drying and post-baking steps.

[0111] The substrate may be a glass substrate or a polymer substrate, but is not limited to these. Preferred glass substrates include soda-lime glass, barium or strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium-borosilicate glass, or quartz. Examples of polymer substrates include polycarbonate, acrylic, polyethylene terephthalate, polyether sulfide, or polysulfone substrates.

[0112] At this time, coating is carried out by known wet coating methods using coating equipment such as a roll coater, spin coater, slit and spin coater, slit coater (sometimes also called a die coater), or inkjet, so as to obtain the desired thickness.

[0113] Pre-baking is performed by heating using an oven, hot plate, or the like. The heating temperature and time during pre-baking are appropriately selected depending on the solvent used, for example, at a temperature of 80-150°C for 1-30 minutes.

[0114] Furthermore, the exposure performed after pre-baking is carried out by an exposure machine, and by exposing the material through a photomask, only the parts corresponding to the pattern are exposed. The light used at this time can be, for example, visible light, ultraviolet light, X-rays, and electron beams.

[0115] The development step, in which the unexposed areas are dissolved using an alkaline aqueous solution after exposure, is performed to remove the photosensitive resin composition from the unexposed areas that were not removed, and this development forms the desired pattern. Suitable developers for this alkaline aqueous solution development include, for example, aqueous solutions of alkali metal or alkaline earth metal carbonates. In particular, this can be carried out using an alkaline aqueous solution containing 1 to less than 3% by weight of carbonates such as sodium carbonate, potassium carbonate, or lithium carbonate, at a temperature of 10 to 50°C, preferably 20 to 40°C, using a developer or ultrasonic cleaner.

[0116] Post-baking is performed to improve the adhesion between the patterned film and the substrate, and is carried out by heat treatment, for example, at 80-250°C for 10-120 minutes. Post-baking can be performed using an oven, hot plate, etc., similar to pre-baking.

[0117] Optical conversion laminated substrate The photoconverting laminated substrate according to the present invention includes a cured product of a photoconverting curable composition. By including a photoconverting curable composition that can be coated onto a glass substrate, the photoconverting laminated substrate can use solvents that are not harmful to the human body, thereby improving worker safety and product productivity.

[0118] The photoconversion laminate substrate may be silicon (Si), silicon oxide (SiOx), or a polymer substrate, and the polymer substrate may be polyethersulfone (PES) or polycarbonate (PC), etc.

[0119] The photoconverting laminate substrate is formed by applying the photoconverting curable composition and then thermally curing or photocuring it.

[0120] <Image display device> The image display device according to the present invention includes the aforementioned cured film, i.e., a color filter or an optical conversion laminated substrate. Specifically, the image display device includes liquid crystal displays (LCDs), organic EL displays (OLED displays), liquid crystal projectors, display devices for game consoles, display devices for mobile terminals such as mobile phones, display devices for digital cameras, display devices for car navigation systems, and the like, with color display devices being particularly preferred.

[0121] The image display device may further include configurations known to those skilled in the art, except that it comprises a color filter or an optical conversion laminate substrate; that is, the present invention includes an image display device to which a color filter or an optical conversion laminate substrate can be applied.

[0122] An image display device including a color filter according to the present invention can have excellent properties with respect to light resistance, high temperature and humidity resistance, and surface roughness. [Examples]

[0123] The present invention will be described in more detail below through the examples. However, the following examples are for the purpose of further illustrating the present invention, and the scope of the present invention is not limited by the following examples.

[0124] <Examples> Synthesis Example 1: Synthesis of InP / ZnSe / ZnS Core-Shell Quantum Dots 0.4 mmol (0.058 g) of indium acetate, 0.6 mmol (0.15 g) of palmitic acid, and 20 mL of 1-octadecene were placed in a reactor and heated to 120°C under vacuum. After 1 hour, the atmosphere in the reactor was switched to nitrogen. After heating to 280°C, a mixed solution of 0.2 mmol (58 μl) of tris(trimethylsilyl)phosphine (TMS3P) and 1.0 mL of trioctylphosphine was rapidly injected and reacted for 0.5 minutes.

[0125] Next, 2.4 mmol (0.448 g) of zinc acetate, 4.8 mmol of oleic acid, and 20 mL of trioctylamine were placed in a reactor and heated to 120°C under vacuum. After 1 hour, the atmosphere in the reactor was switched to nitrogen, and the reactor temperature was raised to 280°C. 2 mL of the previously synthesized InP core solution was added, followed by 4.8 mmol of selenium (Se / TOP) in trioctylphosphine, and the final mixture was reacted for 2 hours. The reaction solution was rapidly cooled to room temperature, ethanol was added, and the resulting precipitate was centrifuged. After filtration under reduced pressure, the precipitate was dried under reduced pressure to form an InP / ZnSe core-shell.

[0126] Next, 2.4 mmol (0.448 g) of zinc acetate, 4.8 mmol of oleic acid, and 20 mL of trioctylamine were placed in a reactor and heated to 120°C under vacuum. After 1 hour, the atmosphere in the reactor was switched to nitrogen, and the reactor temperature was raised to 280°C. 2 mL of the previously synthesized InP core solution was added, followed by 4.8 mmol of sulfur (S / TOP) from trioctylphosphine, and the final mixture was reacted for 2 hours. The reaction solution was rapidly cooled to room temperature, ethanol was added, and the resulting precipitate was centrifuged. The precipitate was then filtered under reduced pressure and dried under reduced pressure.

[0127] The obtained quantum dot powder was dispersed in chloroform to obtain a quantum dot solution with an InP / ZnSe / ZnS core-shell structure, with a solid component content of 25%. The maximum emission wavelength was 535 nm.

[0128] Examples 1-1 to 1-12 and Comparative Examples 1-1 to 1-4: Quantum Dot Manufacturing Example 1-1: Ligand substitution reaction 1 (A-1) 50 mL of the InP / ZnSe / Zns green quantum dots synthesized in Synthesis Example 1 were placed in a centrifuge tube, and 200 mL of ethanol was added to precipitate. The supernatant was discarded after centrifugation, and 30 mL of chloroform was added to the precipitate to disperse the quantum dots. Then, 10.0 g of the ligand represented by the chemical formula 2-1 below was added, and the reaction was carried out for 1 hour under a nitrogen atmosphere while heating at 60°C. Next, 250 mL of n-hexane was added to the reactant to precipitate the quantum dots, and the precipitate was separated by centrifugation to obtain ligand-substituted quantum dot powder (A-1). The maximum emission wavelength was 526 nm. [Chemical formula 2-1] [ka]

[0129] Example 1-2: Ligand substitution reaction 2 (A-2) The procedure was carried out in the same manner as in Example 1-1, except that the compound represented by the following chemical formula 2-2 was used instead of the ligand used in Example 1-1. The maximum emission wavelength was 525 nm. [Chemical formula 2-2] [ka]

[0130] Examples 1-3: Ligand substitution reaction 3 (A-3) The procedure was carried out in the same manner as in Example 1-1, except that the compound represented by the following chemical formula 2-3 was used instead of the ligand used in Example 1-1. The maximum emission wavelength was 525 nm. [Chemical formula 2-3] [ka]

[0131] Examples 1-4: Ligand substitution reaction 4(A-4) The procedure was carried out in the same manner as in Example 1-1, except that the compound represented by the following chemical formula 2-4 was used instead of the ligand used in Example 1-1. The maximum emission wavelength was 520 nm. [Chemical formula 2-4] [ka]

[0132] Examples 1-5: Ligand substitution reaction 5 (A-5) 50 mL of InP / ZnSe / Zns red quantum dots (Nanosys, Gen 5 QD in PGMEA, 25% solids) were placed in a centrifuge tube and precipitated with 200 mL of ethanol. The supernatant was discarded after centrifugation, and 30 mL of chloroform was added to the precipitate to disperse the quantum dots. Then, 10.0 g of the ligand represented by the following chemical formulas 2-5 was added, and the reaction was carried out under a nitrogen atmosphere at 60°C for 1 hour. Next, 250 mL of n-hexane was added to the reactant to precipitate the quantum dots, and the precipitate was separated by centrifugation to obtain ligand-substituted quantum dot powder (A-5). The maximum emission wavelength was 625 nm. [Chemical formula 2-5] [ka]

[0133] Examples 1-6: Ligand substitution reaction 6 (A-6) The procedure was carried out in the same manner as in Examples 1-5, except that a compound represented by the following chemical formula 2-6 was used instead of the ligand used in Examples 1-5. The maximum emission wavelength was 626 nm. [Chemical formula 2-6] [ka]

[0134] Examples 1-7: Ligand substitution reaction 7(A-7) The procedure was carried out in the same manner as in Examples 1-5, except that a compound represented by the following chemical formula 2-7 was used instead of the ligand used in Examples 1-5. The maximum emission wavelength was 626 nm. [Chemical formula 2-7] [ka]

[0135] Examples 1-8: Ligand substitution reaction 8(A-8) The procedure was carried out in the same manner as in Examples 1-5, except that the compound represented by the following chemical formula 2-8 was used instead of the ligand used in Examples 1-5. The maximum emission wavelength was 627 nm. [Chemical formula 2-8] [ka]

[0136] Examples 1-9: Ligand substitution reaction 5 (A-9) The procedure was carried out in the same manner as in Examples 1-5, except that a compound represented by the following chemical formula 2-9 was used instead of the ligand used in Examples 1-5. The maximum emission wavelength was 625 nm. [Chemical formula 2-9] [ka]

[0137] Examples 1-10: Ligand substitution reaction 10 (A-10) The procedure was carried out in the same manner as in Examples 1-5, except that a compound represented by the following chemical formula 2-10 was used instead of the ligand used in Examples 1-5. The maximum emission wavelength was 625 nm. [Chemical formula 2-10] [ka]

[0138] Examples 1-11: Ligand substitution reaction 11 (A-11) The procedure was carried out in the same manner as in Examples 1-5, except that a compound represented by the following chemical formula 2-11 was used instead of the ligand used in Examples 1-5. The maximum emission wavelength was 627 nm. [Chemical formula 2-11] [ka]

[0139] Examples 1-12: Ligand substitution reaction 12 (A-12) The procedure was carried out in the same manner as in Examples 1-5, except that the compound represented by chemical formula 2-12 below was used instead of the ligand used in Examples 1-5. The maximum emission wavelength was 627 nm. [Chemical formula 2-12] [ka]

[0140] Comparative Example 1-1: Ligand Substitution Reaction 13 (A-13) The procedure was carried out in the same manner as in Example 1-1, except that the compound represented by the following chemical formula 1-1 was used instead of the ligand used in Example 1-1. The maximum emission wavelength was 526 nm. [Chemical formula 1-1] [ka]

[0141] Comparative Example 1-2: Ligand Substitution Reaction 14 (A-14) The procedure was carried out in the same manner as in Examples 1-5, except that the compound represented by the following chemical formula 1-2 was used instead of the ligand used in Examples 1-5. The maximum emission wavelength was 627 nm. [Chemical formula 1-2] [ka]

[0142] Comparative Example 1-3: Ligand Substitution Reaction 15 (A-15) The procedure was carried out in the same manner as in Examples 1-5, except that a compound represented by the following chemical formula 1-3 was used instead of the ligand used in Examples 1-5. The maximum emission wavelength was 627 nm. [Chemical formula 1-3] [ka]

[0143] Comparative Example 1-4: Ligand Substitution Reaction 16 (A-16) The procedure was carried out in the same manner as in Examples 1-5, except that a Zn complex compound represented by the following chemical formula 1-4 was used instead of the ligand used in Examples 1-5. The maximum emission wavelength was 629 nm. [Chemical formula 1-4] [ka]

[0144] Examples 2-1 to 2-13 and Comparative Examples 2-1 to 2-4: Preparation of Photoconvertible Curable Compositions A photocurable composition was prepared according to the components and their contents listed in Table 1 below.

[0145] [Table 1] -A-1~A-12: Quantum dots according to Examples 1-1~1-12 -A-13~A-16: Quantum dots based on comparative examples 1-1~1-4 -B-1:1,6-Hexanediol diacrylate -C-1: Irgacure OXE-01 (BASF Corporation) -C-2:Omnirad TPO-H -D-1: Sumilizer GP (Sumitomo Chemical Co., Ltd.; MW661) -E-1:TiO2 (Huntsman, TR-88, particle size 220nm) -F-1:SH8400 (Dow Corning Toray Silicone Co., Ltd.)

[0146] Experimental example (1) Viscosity stability evaluation For the photocurable compositions prepared in Examples 2-1 to 2-13 and Comparative Examples 2-1 to 2-4, the initial viscosity and viscosity after storage at a low temperature of 5°C for one month were measured using an R-type viscometer (VISCOMETER MODEL RE120L SYSTEM, manufactured by Toki Sangyo Co., Ltd.) at a rotation speed of 20 rpm and a temperature of 25°C. The viscosity change rate (%) relative to the initial viscosity was calculated, and the viscosity stability was evaluated according to the evaluation criteria below, as shown in Table 2. <Evaluation Criteria> ○: Viscosity change rate 105% or less △: Viscosity change rate exceeding 105% to 110% or less ×: Viscosity change rate exceeds 110%

[0147] (2) Manufacturing of the photoconversion coating layer The photo-curable compositions according to Examples 2-1 to 2-13 and Comparative Examples 2-1 to 2-4 were applied to a 5cm x 5cm glass substrate using an inkjet method, and then cured at 4000 mJ / cm² using a 395nm Blue LED lamp under nitrogen conditions. 2 After irradiation, the photoconversion coating layer was manufactured by heating in a 180°C oven for 30 minutes. The film thickness of the manufactured photoconversion coating layer was measured using a film thickness analyzer (Dektak 6M, Vecco), and the following high temperature and high humidity resistance and pattern delamination evaluations were performed on a 10 μm coating film.

[0148] (3) Evaluation of resistance to high temperature and high humidity After the manufactured photoconversion coating layer is deposited with SiOx, a blue light source (XLamp XR-E LED, Royal blue 450, illuminance 3mW / cm²) is used. 2 After positioning the sheet on top of a Cree (C.A.) device, the brightness was measured using a luminance meter (CAS140CT Spectrometer, Instrument Systems). The same light conversion sheet was then exposed to a high-temperature, high-humidity treatment device (JOTECH, TH-PE) at 85°C and 85% humidity for 24 hours, and the brightness was measured again using the same method as described above. The brightness retention rate after high-temperature, high-humidity treatment was calculated using Formula 1 below to evaluate the resistance to high temperature and humidity, and the results are shown in Table 2. A higher value indicates superior resistance to high temperature and humidity. [Formula 1] Brightness retention rate (%) = (Brightness after 24 hours of processing at 85°C and 85% humidity) / (Brightness before 24 hours of processing at 85°C and 85% humidity) × 100

[0149] (4) Pattern floating evaluation The fabricated photoconversion coating layer was examined for pattern lifting at the glass interface using optical microscopy (Eclipse LV100POL, Nikon). The results are shown in Table 2.

[0150] (5) Evaluation of the number of consecutive jetting sessions The photo-curable compositions produced in Examples 2-1 to 2-13 and Comparative Examples 2-1 to 2-4 were filled into an inkjet printing machine (UniJet Co., Ltd.). After fixing the jetting head temperature at 40°C, the process of ejecting ink for 1 minute and then letting it stand for 30 minutes was repeated until the nozzle of the jetting head became clogged and ink could no longer be ejected. The number of continuous jetting cycles was evaluated, and the results are shown in Table 2. It can be concluded that the more continuous jetting cycles there are, the better the properties obtained for continuous processes.

[0151] [Table 2]

[0152] Referring to Table 2 above, the photoconvertible curable compositions of Examples 2-1 to 2-13, which have a metal complex consisting of a thiol compound and a specific metal in the ligand layer, exhibit excellent viscosity stability with a viscosity change rate of 105% or less, a brightness maintenance rate of 80% or more after high temperature and high humidity resistance evaluation, excellent adhesion without pattern lifting, and a continuous jetting count of 4 or more. In contrast, it can be confirmed that the photoconvertible curable compositions of Comparative Examples 2-1 to 2-4 show a significant decrease in viscosity stability, high temperature and high humidity resistance, adhesion, and continuous jetting count characteristics.

[0153] Therefore, it was confirmed that the photoconvertible curable composition of the present invention, which includes quantum dots having a metal complex consisting of a thiol compound and a specific metal in its ligand layer, exhibits superior viscosity stability, resistance to high temperature and humidity, adhesion, and inkjet process characteristics compared to photoconvertible curable compositions that do not include this composition.

Claims

1. A quantum dot having a ligand layer on its surface, The ligand layer comprises a metal complex consisting of a thiol compound and one metal selected from the group consisting of Zn, Mg, Al, and In. The aforementioned metal complex is a quantum dot containing one or more compounds selected from those represented by the following chemical formulas 2-1 to 2-12. [Chemical formula 2-1] 【Chemistry 1】 [Chemical formula 2-2] 【Chemistry 2】 [Chemical formula 2-3] 【Transformation 3】 [Chemical formula 2-4] 【Chemistry 4】 [Chemical formula 2-5] 【Transformation 5】 [Chemical formula 2-6] 【Transformation 6】 [Chemical formula 2-7] 【Transformation 7】 [Chemical formula 2-8] 【Transformation 8】 [Chemical formula 2-9] 【Chemistry 9】 [Chemical formula 2-10] 【Chemistry 10】 [Chemical formula 2-11] 【Chemistry 11】 [Chemical formula 2-12] 【Chemistry 12】

2. The quantum dot has a core-shell structure including a core and a shell covering the core, The core contains one or more compounds consisting of two or more combinations of In, P, Zn, Ga, Cd, Se, S, Te, Pb, Ag, Hg, N, As, and O. The quantum dot according to claim 1, characterized in that the shell contains one or more compounds consisting of two or more combinations of In, P, Zn, Ga, Cd, Se, S, Te, Pb, Hg, N, As, O, Mn, and Sr.

3. A quantum dot dispersion comprising the quantum dots described in claim 1 or 2, and one or more of a photopolymerizable compound and a solvent.

4. A photoconvertible curable composition comprising a quantum dot according to claim 1 or 2, and one or more selected from scattering particles, a photopolymerizable compound, a photopolymerizable initiator, and an antioxidant.

5. The photopolymerizable compound comprises 1,6-hexanediol di(meth)acrylate, as described in claim 4, for the photoconvertible curable composition.

6. The aforementioned scattering particles are TiO ２ A photoconvertible curable composition according to claim 4, comprising:

7. The photo-curable composition according to claim 4, comprising one or more photopolymerization initiators selected from the group consisting of oxime compounds and acylphosphine compounds.

8. A cured film formed using the photo-curable composition described in claim 4.

9. The cured film according to claim 8, wherein the cured film is a color filter or a photoconversion laminated substrate.

10. An image display device comprising the cured film described in claim 8.

Images