TW202336208A - Quantum dot, quantum dot dispersion, light converting curable composition, and cured film and display device manufactured by the composition - Google Patents

Abstract

The present invention relates to a quantum dot having a ligand layer on the surface thereof, and provides a quantum dot in which the ligand layer contains a compound having a specific chemical formula structure, a quantum dot dispersion containing the quantum dot, and a light converting curable composition. The quantum dot and the light converting curable composition comprising the same according to the present invention have excellent light conversion efficiency, heat resistance, light resistance, high-temperature and high-humidity resistance, adhesion, surface roughness, viscosity stability and coating hardness, and can be effectively used in a quantum dot film, a quantum dot light emitting diode, a color filter, a light conversion laminated substrate, and the like, so as to provide a high-quality image display device.

Description

Quantum dots, quantum dot dispersion liquid, photoconversion curable composition, cured film formed using the composition, and image display device

The present invention relates to a quantum dot, a quantum dot dispersion liquid containing the quantum dot, a photoconversion curable composition, a cured film formed using the photoconversion curable composition, and an image display device including the cured film.

Quantum dots have high luminescence and narrow luminescence spectrum, and can adjust the luminescence wavelength with one excitation wavelength. They have the inherent characteristics of photostable quantum dots, so until recently, a lot of research has been carried out in biological imaging, energy conversion and lighting. (LED) and other important application fields.

These quantum dots are materials that are very sensitive to surface states, and oxidation occurs from the surface depending on the dispersion solvent or the surrounding environment, resulting in a rapid decrease in luminous efficiency. For various applications of quantum dots, in addition to the organic solvent in which they are initially dispersed, they must also be dispersed in various solvents or form specific functional groups on the surface, and these processes will cause damage to the quantum dot surface and ultimately lead to a decrease in luminous efficiency.

Many attempts have been made to overcome these problems and various methods are being proposed. One of them is the functional group substitution (ligand exchange) method, in which organic materials present on the quantum dot surface are replaced by molecules with the desired functional groups. This method is a method of replacing organic molecules present on the surface of quantum dots with organic molecules suitable for the application, but since it directly affects the surface of quantum dots, it has the disadvantage of causing serious luminous efficiency problems.

Korean patent application No. 10-2018-0002716 and Korean patent No. 10-1628065 disclose quantum dots containing ligands on the surface. However, due to low compatibility, poor dispersion, insufficient light conversion efficiency and heat resistance, and viscosity stability Insufficient, so there are the following problems: not only is it not suitable for the inkjet method, but the surface roughness characteristics are deteriorated, the light resistance is insufficient, and the quantum dots are damaged over time in a high temperature and high humidity environment, resulting in optical sheets. performance degradation.

[Prior art documents] [Patent Document] (Patent document 1) Korean patent application No. 10-2018-0002716; (Patent Document 2) Korean Patent No. 10-1628065.

[problem to be solved]

An object of the present invention is to provide a quantum dot for a light conversion curable composition that is excellent in light conversion efficiency, heat resistance, light resistance, high temperature and high humidity resistance, adhesion, surface roughness, viscosity stability, and coating film hardness. .

Furthermore, an object of the present invention is to provide a quantum dot dispersion liquid and a photoconversion curable composition containing the quantum dots.

Furthermore, an object of the present invention is to provide a cured film formed using the photoconversion curable composition and an image display device including the cured film. [Solution to the problem]

The present invention provides a quantum dot having a coordination base layer on its surface, the coordination base layer containing at least one of the compounds represented by the following Chemical Formula 1 and Chemical Formula 2.

[Chemical formula 1] , in Chemical Formula 1, A _a is a thiol group, amine group, imidazole group or carboxyl group, L _a is a thiol group, amine group or carboxyl group, R _a is a linear or branched chain having 1 to 20 carbon atoms Trivalent hydrocarbon group, X _a is a direct bond, -OC(=O)-, -C(=O)O-, -C(=O)NH- or -HNC(=O)-, Y _a is a Straight-chain or branched alkanediyl groups of 20 carbon atoms, , or , n is an integer from 1 to 15, m is an integer from 1 to 10, Z is an alkyl group with 1 to 20 carbon atoms, a cycloalkyl group with 3 to 20 carbon atoms, and a cycloalkyl group with 6 to 20 carbon atoms. An aromatic hydrocarbon group, or a photopolymerizable reactive group having 2 to 20 carbon atoms, and there is no case where A _a and L _a are both thiol groups.

[Chemical formula 2] , in Chemical Formula 2, A ¹ is a thiol group, amine group or carboxyl group, L ¹ and L ² are each independently a direct bond or a linear or branched alkanediyl group having 1 to 3 carbon atoms, and R ¹ is -OC(=O)-, -C(=O)O-, -C(=O)-, -C(=S)S-, -SC(=S)-, -C(=O)NH- , -HNC(=O)-, -SC(=O)-, -C(=O)S-, -HNC(=O)NH-, -SC(=S)S-, -OC(=O) O- or -C(=O)OC(=O)-, R ² is -OC(=O)-, -C(=O)O-, -C(=O)-, -C(=S) S-, -SC(=S)-, -C(=O)NH-, -HNC(=O)-, -HNC(=O)NH-, -SC(=S)S-, -OC(= O)O- or -C(=O)OC(=O)-, X ¹ is a direct bond, a linear or branched alkyldiyl group with 1 to 20 carbon atoms, , or , n is an integer from 1 to 15, m is an integer from 1 to 10, Y ¹ is an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or an alkoxy group having 3 to 20 carbon atoms. cycloalkyl group, aromatic hydrocarbon group having 6 to 30 carbon atoms, or photopolymerizable reactive group having 2 to 20 carbon atoms.

Furthermore, the present invention provides a quantum dot dispersion liquid and a photoconversion curable composition containing the quantum dots.

Furthermore, the present invention provides a cured film formed using the photoconversion curable composition and an image display device including the cured film. [Effects of the invention]

The quantum dot system according to the present invention contains a compound represented by a specific chemical structure as a ligand layer, and the compound has two reaction sites that can serve as anchors. The reaction site is a position that combines with the quantum dots and can increase Reactivity with quantum dots. When both reaction sites are combined with quantum dots, the stability of quantum dots can be further improved.

In addition, the quantum dot system according to the present invention contains a compound represented by a specific chemical structure as a coordination base layer to improve compatibility and protect the surface of the quantum dot from oxidation, thereby exhibiting excellent light resistance, high temperature and high humidity resistance properties, adhesion, and surface roughness to prevent deterioration of quantum efficiency and therefore have excellent optical properties.

In addition, the quantum dots and the photoconversion curable composition containing the quantum dots provide improved light conversion efficiency, heat resistance, light resistance, high temperature and high humidity resistance, adhesion, surface roughness, viscosity stability and coating film hardness. Excellent effect, and can be effectively used in quantum dot films, quantum dot light-emitting diodes, color filters, light conversion laminated substrates and other purposes, thereby providing high-quality image display devices.

The present invention provides a quantum dot having a coordination base layer on its surface, the coordination base layer containing at least one of the compounds represented by the following Chemical Formula 1 and Chemical Formula 2.

[Chemical formula 1] In Chemical Formula 1, A _a is a thiol group, amine group, imidazole group or carboxyl group, L _a is a thiol group, amine group or carboxyl group, R _a is a linear or branched three-chain tricyclic group having 1 to 20 carbon atoms. _Valent hydrocarbon group _, Straight-chain or branched alkanediyl carbon atoms, , or , n is an integer from 1 to 15, m is an integer from 1 to 10, Z is an alkyl group with 1 to 20 carbon atoms, a cycloalkyl group with 3 to 20 carbon atoms, and a cycloalkyl group with 6 to 20 carbon atoms. An aromatic hydrocarbon group, or a photopolymerizable reactive group having 2 to 20 carbon atoms, and there is no case where A _a and L _a are both thiol groups.

[Chemical formula 2] , in Chemical Formula 2, A ¹ is a thiol group, amine group or carboxyl group, L ¹ and L ² are each independently a direct bond or a linear or branched alkanediyl group having 1 to 3 carbon atoms, and R ¹ is -OC(=O)-, -C(=O)O-, -C(=O)-, -C(=S)S-, -SC(=S)-, -C(=O)NH- , -HNC(=O)-, -SC(=O)-, -C(=O)S-, -HNC(=O)NH-, -SC(=S)S-, -OC(=O) O- or -C(=O)OC(=O)-, R ² is -OC(=O)-, -C(=O)O-, -C(=O)-, -C(=S) S-, -SC(=S)-, -C(=O)NH-, -HNC(=O)-, -HNC(=O)NH-, -SC(=S)S-, -OC(= O)O- or -C(=O)OC(=O)-, X ¹ is a direct bond, a linear or branched alkyldiyl group with 1 to 20 carbon atoms, , or , n is an integer from 1 to 15, m is an integer from 1 to 10, Y ¹ is an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or an alkoxy group having 3 to 20 carbon atoms. cycloalkyl group, aromatic hydrocarbon group having 6 to 30 carbon atoms, or photopolymerizable reactive group having 2 to 20 carbon atoms.

The quantum dots according to the present invention include the above compound as a ligand layer. The compound represented by Chemical Formula 1 has two reaction sites that can serve as anchors. The reaction site is a position that combines with the quantum dots and can increase the binding capacity with the quantum dots. The reactivity of the quantum dots can be further improved when both reaction sites are combined with the quantum dots.

In addition, since the quantum dots according to the present invention include the above compound as a coordination group layer, the surface of the quantum dot is protected to improve light resistance and high temperature and high humidity resistance, and the surface roughness characteristics are improved by improving compatibility.

Furthermore, the present invention provides a quantum dot dispersion liquid containing the quantum dots and at least one of a photopolymerizable monomer and a solvent.

Furthermore, the present invention provides a photoconversion curable composition containing the quantum dot dispersion liquid, a cured film formed using the composition, and an image display device containing the cured film.

Hereinafter, the structure of this invention is demonstrated in detail.

＜ quantum dots ＞

In the present invention, quantum dots can emit light from the source and be used to generate light in the visible and infrared regions. Quantum dots are materials with nanometer-sized crystal structures that may be composed of hundreds to thousands of atoms. Atoms form molecules, which form collections of small molecules called clusters to form nanoparticles, often these nanoparticles are called quantum dots especially when they have semiconductor properties. As long as it conforms to this concept, the quantum dots of the present invention are not particularly limited. When an object becomes smaller than a nanometer size, the energy band gap of the object increases (i.e., quantum confinement effect). When a quantum dot receives energy from the outside and reaches an excited state, it emits energy similar to its own. The energy corresponding to the band gap allows self-luminescence.

The quantum dot according to the present invention has a coordination group layer on the surface, and the coordination group layer contains at least one of the compounds represented by the following Chemical Formula 1 and Chemical Formula 2. As a result, the surface of the quantum dots is protected and oxidation stability is improved, thereby preventing quantum efficiency degradation and improving reliability.

[Chemical formula 1] In Chemical Formula 1, A _a may be a thiol group, amine group, imidazole group or carboxyl group, L _a may be a thiol group, amine group or carboxyl group, R _a may be a straight chain or branched chain having 1 to 20 carbon atoms. Chain trivalent hydrocarbon group, X _a can be a direct bond, -OC(=O)-, -C(=O)O-, -C(=O)NH- or -HNC(=O)-, Y _a can be Straight-chain or branched alkanediyl groups with 1 to 20 carbon atoms, , or , n may be an integer from 1 to 15, m may be an integer from 1 to 10, Z may be an alkyl group with 1 to 20 carbon atoms, a cycloalkyl group with 3 to 20 carbon atoms, or a cycloalkyl group with 6 to 20 carbon atoms. An aromatic hydrocarbon group having 2 to 20 carbon atoms, or a photopolymerizable reactive group. The photopolymerizable reactive group may be an alkenyl group, an alkynyl group or an acrylate group.

However, in Chemical Formula 1, there is no case where A _a and L _a are both thiol groups. When A _a and L _a are both thiol groups, there is a problem of deterioration of the dispersion and optical properties of the quantum dots due to the high probability of forming a disulfide bond between the ligands.

[Chemical formula 2] In Chemical Formula 2, A ¹ may be a thiol group, an amine group or a carboxyl group, L ¹ and L ² may each independently be a direct bond or a linear or branched chain alkanediyl group having 1 to 3 carbon atoms, and R ¹ may For -OC(=O)-, -C(=O)O-, -C(=O)-, -C(=S)S-, -SC(=S)-, -C(=O)NH -, -HNC(=O)-, -SC(=O)-, -C(=O)S-, -HNC(=O)NH-, -SC(=S)S-, -OC(=O )O- or -C(=O)OC(=O)-, preferably -OC(=O)-, -C(=O)O-, -C(=O)NH-, -HNC(= O)-, -C(=O)-, -C(=S)S-, -SC(=S)-, -OC(=O)O- or -C(=O)OC(=O)- , R ² can be -OC(=O)-, -C(=O)O-, -C(=O)-, -C(=S)S-, -SC(=S)-, -C( =O)NH-, -HNC(=O)-, -HNC(=O)NH-, -SC(=S)S-, -OC(=O)O- or -C(=O)OC(= O)-, preferably -OC(=O)-, -C(=O)O-, -C(=O)NH-, -HNC(=O)-, -C(=O)-, - C(=S)S-, -SC(=S)-, -OC(=O)O- or -C(=O)OC(=O)-, X ¹ can be a direct bond, with 1 to 20 Straight-chain or branched alkanediyl carbon atoms, , or , n may be an integer from 1 to 15, m may be an integer from 1 to 10, Y ¹ may be an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or an alkoxy group having 3 to 20 carbon atoms. A cycloalkyl group having 6 to 30 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.

In Chemical Formula 2, R ¹ and R ² each independently include a functional group that forms a polar covalent bond between a carbon atom and an element with an electronegativity greater than that of the carbon atom. That is, the compound represented by Chemical Formula 2 contains two or more polar functional groups in its molecule, and when introduced as a ligand for quantum dots, it has excellent compatibility with solvents such as PGMEA or photopolymerizable monomers. Therefore, It can improve the light resistance, high temperature and humidity resistance, adhesion and surface roughness properties of quantum dots.

In one embodiment of the present invention, the coordination group layer may include at least one selected from the compounds represented by the following Chemical Formula 1-1 to Chemical Formula 1-7: [Chemical Formula 1-1] [Chemical formula 1-2] [Chemical formula 1-3] [Chemical formula 1-4] [Chemical formula 1-5] [Chemical formula 1-6] [Chemical formula 1-7] .

In one embodiment of the present invention, the coordination group layer may include at least one selected from the compounds represented by Chemical Formula 2-1 to Chemical Formula 2-8: [Chemical Formula 2-1] [Chemical formula 2-2] [Chemical formula 2-3] [Chemical formula 2-4] [Chemical formula 2-5] [Chemical formula 2-6] [Chemical formula 2-7] [Chemical formula 2-8] .

The compound represented by Chemical Formula 1 and/or Chemical Formula 2 of the present invention can play a role in stabilizing quantum dots by being coordinated to the surface of the quantum dot as an organic ligand. Generally prepared quantum dots usually have a coordination base layer on the surface. The newly prepared coordination base layer can be composed of oleic acid, lauric acid, 2-(2-methoxyethoxy)acetic acid, 2-[2-(2- It is composed of methoxyethoxy)ethoxy]acetic acid, succinic acid mono-[2-(2-methoxy-ethoxy)-ethyl] ester, etc. In this case, compared with the quantum dot of the present invention including the compound represented by Chemical Formula 1 as the coordination group layer, since the bonding force between the coordination group layer and the quantum dot is weaker, the non-bonding of the quantum dot surface Defects may reduce surface protection. In addition, oleic acid has good dispersibility in unsaturated hydrocarbon solvents such as highly volatile organic compounds (VOC) n-hexane and aromatic solvents such as chloroform and benzene, but has poor dispersibility in solvents such as PGMEA.

The compound represented by Chemical Formula 1 contained in the ligand layer of the quantum dot according to the present invention has two reaction sites that can serve as anchors. The reaction site is a position that binds to the quantum dots and can increase the reaction with the quantum dots. When both reaction sites are combined with quantum dots, the stability of quantum dots can be further improved.

In some embodiments, the quantum dots according to the present invention include the compound represented by Chemical Formula 1 in the ligand layer, and further include oleic acid, lauric acid, 2-(2-methoxyethoxy)acetic acid, 2 -[2-(2-methoxyethoxy)ethoxy]acetic acid, succinic acid mono-[2-(2-methoxy-ethoxy)-ethyl] ester, etc.

The quantum dot is not particularly limited as long as it is a quantum dot particle capable of emitting light when stimulated by light or electricity. For example, substances may be selected from the following groups: II-VI semiconductor compounds, III-V semiconductor compounds, IV-VI semiconductor compounds, Group IV elements or compounds containing the elements, and combinations thereof, and these substances It can be used individually or in mixture of 2 or more types.

For example, the II-VI semiconductor compound can be selected from the following group of materials: binary compounds selected from the following: CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe and mixtures thereof; Ternary compounds selected from the following: CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe and mixtures thereof; and selected from The following quaternary compounds: CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and their mixtures, but are not limited thereto.

Group III-V semiconductor compounds may be selected from the following group of substances: Binary compounds selected from the following: GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and mixtures thereof ; Ternary compounds selected from the following: GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP and mixtures thereof; and selected from the following Quaternary compounds: GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb and their mixtures, but are not limited thereto.

Group IV-VI semiconductor compounds may be selected from at least one of the following groups: binary compounds selected from the following: SnS, SnSe, SnTe, PbS, PbSe, PbTe and mixtures thereof; ternary compounds selected from the following : SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and mixtures thereof; and quaternary compounds selected from the following: SnPbSSe, SnPbSeTe, SnPbSTe and mixtures thereof, but not limited thereto.

Although not limited thereto, the Group IV element or a compound containing the element may be selected from elements selected from Si, Ge, or mixtures thereof; and binary compounds selected from SiC, SiGe, or mixtures thereof.

The quantum dots can be a uniform single structure, a dual structure such as a core-shell structure and a gradient structure, or a mixed structure thereof. In the present invention, the quantum dots are not particularly limited as long as they can emit light when excited by light.

According to one embodiment, the quantum dot has a core-shell structure, and the core includes a compound composed of two or more of the following groups: In, P, Zn, Ga, Cd, Se, S, Te, Pb, Ag , Hg, N, As and O, and the shell may contain at least one of compounds consisting of two or more of the following groups: In, P, Zn, Ga, Cd, Se, S, Te, Pb, Hg, N, As, O, Mn and Sr.

Specifically, the core may include at least one selected from the following groups: 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, the shell may include at least one selected from the following groups: ZnS, ZnSe, ZnTe, ZnO, CdS, CdSe, CdTe, CdO, InP, InS, GaP, GaN, GaO, GaS, InZnP, InGaP, InGaN, InZnSCdSe, PbS, TiO, SrSe and HgSe, and preferably can include at least one selected from the following groups: InP/ZnS, InP/ZnSe , InP/GaP/ZnS, InP/ZnSe/ZnS, InP/ZnSeTe/ZnS and InP/MnSe/ZnS, but not limited to these.

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

Quantum dots according to the present invention can be synthesized by wet chemical processes.

The wet chemical process is a method of growing particles by placing precursors in organic solvents. When the crystal grows, the organic solvent naturally coordinates on the surface of the quantum dot crystal, acting as a dispersant and regulating the growth of the crystal. Therefore, the size growth of quantum dot particles can be controlled by using a process that is easier and cheaper than vapor deposition methods (organometallic chemical vapor deposition or molecular beam epitaxy, etc.).

When preparing quantum dots through wet chemical processes, organic ligands are used in order to prevent aggregation of quantum dots and control the particle size of quantum dots at the nanometer level. As such an organic ligand, oleic acid can generally be used.

In one embodiment of the present invention, the oleic acid used in the preparation process of quantum dots is replaced by the compound represented by Chemical Formula 1 through a ligand exchange method.

In ligand exchange, the organic ligand to be exchanged (i.e., the compound represented by Chemical Formula 1) is added to a dispersion containing quantum dots with the original organic ligand (i.e., oleic acid), which can Quantum dots incorporating the compound represented by Chemical Formula 1 are obtained by stirring at room temperature to 200° C. for 30 minutes to 3 hours. If necessary, the quantum dots combined with the compound of Chemical Formula 1 can be additionally separated and purified.

As mentioned above, quantum dots according to embodiments of the present invention can be prepared by using an organic ligand exchange method at room temperature through a simple stirring process, and therefore have the advantage of being mass-produced.

In addition, compared with the initial quantum efficiency, the quantum dots according to the embodiments of the present invention can maintain a quantum efficiency of more than about 90% even after 15 days, so that they can be stored stably for a long time and can be commercialized for various uses.

＜ Quantum dot dispersion ＞

The quantum dot dispersion liquid according to the embodiment of the present invention contains at least one of the above-mentioned quantum dots, a photopolymerizable compound and a solvent.

quantum dots

The quantum dot dispersion liquid according to the embodiment of the present invention contains the above-mentioned quantum dots. The description of quantum dots is the same as the description above in <Quantum Dots>.

Relative to the total weight of the quantum dot dispersion, the content of the quantum dots may be 10 to 90% by weight, preferably 20 to 80% by weight, and more preferably 30 to 70% by weight. When the content of the quantum dots is within the above range, there are advantages in that the luminous efficiency is excellent and the reliability of the light conversion coating prepared using the quantum dots is excellent. When the content of the quantum dots is within the above range, the dispersibility of the quantum dots is good, the coating or spraying characteristics are excellent, and the optical characteristics and reliability are excellent, so it is preferable.

photopolymerizable compound

Photopolymerizable compounds are used to improve the dispersion of quantum dots.

Examples of the photopolymerizable compound include monofunctional monomers, bifunctional monomers, and other polyfunctional monomers. Preferably, monomers with a bifunctional or higher group can be used.

The type of monofunctional monomer is not particularly limited, and examples thereof include nonylphenylcarbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexylcarbitol acrylate, and acrylic acid. 2-hydroxyethyl ester, etc.

The type of the bifunctional monomer is not particularly limited, and examples thereof include: 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, and ethylene glycol di(meth)acrylate. (Meth)acrylate, neopentyl glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, bis(acryloyloxyethyl) ether of bisphenol A, 3-methyl Pentylene glycol di(meth)acrylate, etc.

The type of the multifunctional monomer is not particularly limited, and examples thereof include: trimethylolpropane tri(meth)acrylate, methoxylated 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, dipentaerythritol hexa(meth)acrylate, etc.

Among them, in terms of volatility, viscosity and spray characteristics, the photopolymerizable compound preferably contains at least one selected from the following groups: 2-hydroxyethyl acrylate, 1,4-butanediol di(methyl ) Acrylate, 1,6-hexanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate emulsion, triethylene glycol di(meth)acrylate Acrylates, dipropylene glycol di(meth)acrylate and tripropylene glycol di(meth)acrylate.

When the quantum dot dispersion according to the present invention contains a photopolymerizable compound, the content of the photopolymerizable compound may be 10 to 90% by weight, preferably 20 to 80% by weight, relative to the total weight of the quantum dot dispersion. Preferably, it is 30 to 70% by weight. When the content of the photopolymerizable compound is within the above range, it is preferable because the quantum dots have good dispersibility, excellent coating properties and spray properties, and excellent optical properties and reliability.

In the present invention, the description of the photopolymerizable compound applies equally to the photopolymerizable compound contained in the photoconversion curable composition described below.

Solvent

As long as the solvent can effectively dissolve other components contained in the quantum dot dispersion liquid, solvents commonly used in the art can be used without particular limitations. As a specific example, the solvent may be selected from at least one of the following: ethers, acetates, aromatic hydrocarbons, ketones, alcohols, esters and amides, but is not limited thereto.

Specifically, ether solvents include: ethylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, etc.; propylene glycol mono Alkyl ethers such as propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, etc.; diethylene glycol dialkyl ethers such as diglyme, diglyme diethyl ether, diethylene glycol Dipropyl ether, diethylene glycol dibutyl ether, etc.

Specifically, acetate solvents include, for example, alkylene glycol alkyl ether acetates such as methyl cellosolve acetate, ethyl cellosolve acetate, propylene glycol monomethyl ether acetate, Propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, etc.; alkoxyalkyl acetates such as methoxybutyl acetate, methoxypentyl acetate, n-pentyl acetate, etc.

Specific examples of aromatic hydrocarbon solvents include benzene, toluene, xylene, mesitylene, and the like.

Specific examples of ketone solvents include methyl ethyl ketone, acetone, methyl amyl ketone, methyl isobutyl ketone, cyclohexanone, and the like.

Specific examples of the alcohol solvent include ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol, glycerin, and the like.

Specific examples of the ester solvent include: cyclic esters such as γ-butyrolactone; ethyl 3-ethoxypropionate, methyl 3-methoxypropionate, and ethyl 3-ethoxypropionate. Ester etc.

Specific examples of the amide solvent include N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, and the like.

These solvents can be used individually or in mixture of two or more types.

When the quantum dot dispersion according to the present invention contains a solvent, the content of the solvent may be 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 content of the solvent is within the above range, it is preferable because the quantum dots have good dispersibility, excellent coating or spraying properties, and excellent optical properties and reliability.

In the present invention, the description of the solvent applies equally to the solvent contained in the photoconversion curable composition described below.

＜ Photoconversion curable composition ＞

In addition to the above-mentioned quantum dots, the photoconversion curable composition according to the embodiment of the present invention may further contain one or more components commonly known in the art, such as scattering particles, photopolymerizable compounds, and photopolymerizable initiators as needed. , antioxidants and solvents, etc. The description of the solvent is the same as that described above in <Quantum Dot Dispersion Liquid>.

From the perspective of a continuous process, the photoconversion curable composition according to the embodiment of the present invention may be a solvent-free type that does not contain a solvent. This solvent-free photoconvertible curable composition has high dispersibility and high viscosity stability, and can be suitable for use in continuous processes based on inkjet methods.

The preparation method of the photoconversion curable composition of the present invention is not particularly limited, and methods commonly known in the art can be used.

quantum dots

The photoconversion curable composition according to an embodiment of the present invention contains the above-mentioned quantum dots. In addition, in terms of improving dispersion, the photoconversion curable composition can be prepared by first preparing a quantum dot dispersion liquid and then mixing the remaining components. The description of quantum dots and quantum dot dispersion liquid is the same as described above in <Quantum Dot> and <Quantum Dot Dispersion>.

Relative to the total weight of the solid content of the photoconversion curable composition, the content of quantum dots may be 1 to 60% by weight, preferably 5 to 55% by weight, and more preferably 10 to 50% by weight. The photoconversion curable composition containing quantum dots within the above content range is preferable because it can have increased luminous efficiency and improved color reproducibility.

scattering particles

The scattering particles can use general inorganic materials, and preferably can include metal oxides with an average particle diameter of 30 to 1000 nanometers.

The metal oxide may be an oxide including at least one selected from the following metals: 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 their combinations, but are not limited to these.

Specifically, it may be one or more selected from the following groups: 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 , SnO, MgO and their combinations preferably contain TiO ₂ from the perspective of scattering effect. If necessary, a material surface-treated with a compound having an unsaturated bond (acrylate, etc.) can also be used.

When the quantum dot light-converting curable composition according to the present invention includes scattering particles, it is preferable that the overall light efficiency in the color filter can be improved by increasing the paths of light spontaneously emitted from the quantum dots through the scattering particles.

Preferably, the scattering particles may have an average particle diameter of 30 to 1000 nanometers, preferably in the range of 100 to 500 nanometers. At this time, if the particle size is too small, sufficient scattering effect for the light emitted from the quantum dots cannot be expected, and on the other hand, if it is too large, it will sink in the composition or a self-luminous layer surface of uniform quality cannot be obtained, Therefore, use it with appropriate adjustment within the above range.

When the light-converting curable composition according to the present invention includes scattering particles, the content of the scattering particles may be 0.5 to 35% by weight, preferably 0.5 to 15% by weight, relative to the total solid weight of the light-converting curable composition. More preferably, it is 3 to 10% by weight. When the scattering particles are within the above content range, it is possible to provide excellent luminous efficiency and light retention, excellent surface hardness, no cracks, good diffusivity and sensitivity as well as pattern stability, development speed, solvent resistance and degassing reduction effects. photoconvertible curable composition.

photopolymerizable compound

Examples of the photopolymerizable compound include monofunctional monomers, bifunctional monomers, other polyfunctional monomers, and the like, and monomers having a bifunctional or higher group are preferably used.

The type of monofunctional monomer is not particularly limited, and examples thereof include nonylphenylcarbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexylcarbitol acrylate, and acrylic acid. 2-hydroxyethyl ester, etc.

The type of the bifunctional monomer is not particularly limited, and examples thereof include: 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, and ethylene glycol di(meth)acrylate. (Meth)acrylate, neopentyl glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, bis(acryloyloxyethyl) ether of bisphenol A, 3-methyl Pentylene glycol di(meth)acrylate, etc.

The type of the multifunctional monomer is not particularly limited, and examples thereof include: trimethylolpropane tri(meth)acrylate, methoxylated 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, dipentaerythritol hexa(meth)acrylate, etc.

Among them, in terms of volatility, viscosity and spray characteristics, it is more preferable to include at least one of the following groups: 2-hydroxyethyl acrylate, 1,4-butanediol di(meth)acrylate, 1, 6-Hexanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate latex, triethylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate (Meth)acrylate, tripropylene glycol di(meth)acrylate.

When the photoconversion curable composition according to the present invention includes a photopolymerizable compound, the content of the photopolymerizable compound may be 20 to 80% by weight, preferably 30 to 80% by weight relative to the total solid weight of the photoconversion curable composition. 70% by weight. When the content of the photopolymerizable compound is within the above content range, the following effects can be obtained: the sensitivity is not reduced and the intensity or smoothness of the pixel portion can be improved.

Photopolymerization initiator

The photopolymerization initiator is a compound that initiates the polymerization of the above-mentioned photopolymerizable compound. The present invention is not particularly limited. However, from the aspects of polymerization characteristics, initiation efficiency, absorption wavelength, availability, price, etc., it is preferable to use one selected from the following: At least one of the compounds of the group: acetophenone compounds, benzophenone compounds, triazine compounds, biimidazole compounds, oxime compounds, acylphosphine compounds and thioxanthone compounds.

Examples of acetophenone compounds include diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethyl ketal, and 2-hydroxy -1-[4-(2-hydroxyethoxy)phenyl]-2-methylpropan-1-one, 1-hydroxycyclohexylphenylketone, 2-methyl-1-(4-methylthiophene base)-2-morpholinylpropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butan-1-one, 2-hydroxy-2- Methyl[4-(1-methylvinyl)phenyl]propan-1-one oligomers, etc., preferably 2-benzyl-2-dimethylamino-1-(4 -morpholinophenyl)butan-1-one, etc.

Examples of benzophenone compounds include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, and the like. Examples of benzophenone compounds include benzophenone, methyl o-phenylbenzoate, 4-phenylbenzophenone, and 4-benzyl-4'-methyldiphenylsulfide. Ether, 3,3',4,4'-tetrakis(tertiary butylperoxycarbonyl)benzophenone, 2,4,6-trimethylbenzophenone, etc. Examples of thioxanthone compounds include 2-isopropylthioxanthone, 4-isopropylthioxanthone, 2,4-diethylthioxanthone, 2,4-dichlorothioxanthone, 1 -Chloro-4-propoxythioxanthone, etc.

Examples of triazine compounds include: 2,4-bis(trichloromethyl)-6-(4-methoxyphenyl)-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-(4-methoxyphenyl)-1,3,5-triazine, Methyl)-6-(4-methoxynaphthyl)-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-(4-methoxystyryl)- 1,3,5-triazine, 2,4-bis(trichloromethyl)-6-[2-(5-methylfuran-2-yl)vinyl]-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-[2-(furan-2-yl)vinyl]-1,3,5-triazine, 2,4-bis(trichloromethyl)-6 -[2-(4-diethylamino-2-methylphenyl)vinyl]-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-[2-( 3,4dimethoxyphenyl)vinyl]-1,3,5-triazine, etc.

Examples of 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, 2,2'-bis(2,4-dichlorophenyl) -4,4',5,5'-tetraphenyl-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-dibromophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole, 2,2'-bis(2,4,6 -Tribromophenyl)-4,4', 5,5'-tetraphenyl-1,2'-biimidazole, etc.

Examples of oxime compounds include: 2-(O-benzoyl oxime)-1-[4-(phenylthio)phenyl]-1,2-octanedione, 1-(4-methylsulfide) phenyl)butane-1,2-butane-2-oxime-O-acetate, 1-(4-methylthiophenyl)butane-1-oxime-O-acetate, hydroxyl Imino (4-methylthiophenyl) ethyl acetate-O-acetate, hydroxyimino (4-methylthiophenyl) ethyl acetate-O-benzoate, etc., and Representative products include Irgacure OXE-01 and OXE-02 commercially available from BASF.

Examples of acylphosphine compounds include 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,6-dimethylbenzoyldiphenylphosphine oxide, 2,6-trimethylbenzoyldiphenylphosphine oxide, 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-trimethyl-pentanyl Phosphine oxide, methyl 2,4,6-trimethylbenzoylphenylphosphinate, and 2,4,6-trimethylbenzoylphenylphosphinic acid include ethyl ester, 2 , 4,6-Trimethylbenzylphenylphosphinic acid phenyl ester, etc.

Examples of the thioxanthone compound include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, isopropylthioxanthone, and 2,4-diisopropylthioxanthone.

When the photoconversion curable composition according to the present invention includes a photopolymerization initiator, the content of the photopolymerization initiator may be 0.2 to 15% by weight, preferably 0.5 to 15% by weight relative to the total solid weight of the photoconversion curable composition. 10% by weight. When the content of the photopolymerization initiator is within the above range, there is an advantage that the sensitivity of the photoconversion curable composition is high, so the intensity of the pixel portion formed using the composition and the smoothness of the surface of the pixel portion become good. .

Antioxidants

The antioxidant may include at least one selected from the group consisting of phosphorus antioxidants, phenolic antioxidants, and sulfur antioxidants, and may preferably include at least one selected from the group consisting of phosphorus antioxidants and sulfur antioxidants.

As the phosphorus antioxidant, for example, at least one selected from the following can be used: tris(2,4-di-tertiary butylphenyl)phosphite (Songnox 1680), tris(nonylphenyl)phosphite Ester (TNPP), bis-(2,4-di-tertiary butylphenyl) pentaerythritol diphosphide, etc.

As the phenolic antioxidant, for example, at least one selected from the following can be used: 2,6-di-tertiary butyl-4-methylphenol (BHT), thiodiethylenebis[2-(3 ,5-di-tertiary butyl-4-hydroxyphenyl) propionate (Songnox 1035), octadecyl-3-(3,5-di-tertiary butyl-4-hydroxyphenyl) propionate acid ester (Songox 1076), tetrakis[methylene-3-(3,5-di-tertiary butyl-4-hydroxyphenyl)propionate]methane (Songox 1010), etc.

As the sulfur antioxidant, for example, at least one selected from the following can be used: dilauryl-3,3'-thiodipropionate, diimidazole-3,3'-thiodipropionate, dilauryl-3,3'-thiodipropionate, Stearyl-3,3'-thiodipropionate, pentaerythritol tetrakis (3-laurylthiopropionate), etc.

In addition, commercially available antioxidants include, for example: IRGANOX 1035, IRGANOX 1081, IRGANOX 1425, IRGANOX 1726 (the above, purchased from BASF), Sumilizer GP (purchased from Sumitomo Chemical Co., Ltd.), 135A, AO-40 (the above, purchased from Purchased from Adeka Company), etc.

The antioxidants exemplified above can be used alone or in a mixture of two or more kinds.

When the photoconversion curable composition according to the present invention includes 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 photoconversion curable composition. When the content of the antioxidant is within the above range, it is preferable because the flatness, adhesion, etc. of the light conversion ink curable composition can be improved.

The light conversion curable composition prepared above can be preferably used for cured films such as color filters and light conversion laminated substrates, and image display devices containing them.

＜ Cured film ＞

The present invention provides a cured film formed using the above-mentioned light conversion curable composition. The cured film may be a color filter or a light conversion laminated base material.

color filter

The pattern forming method for forming the color filter of the present invention can use methods commonly known in the art.

For one implementation, the patterning method may include: (a) The step of applying the quantum dot curable composition to the substrate; (b) Pre-baking step; (c) The step of curing the exposed portion by placing a photomask on the obtained film and irradiating active light; (d) The step of the development process using an alkaline aqueous solution to dissolve the unexposed parts; and (e) Drying and post-baking execution steps.

The substrate may be a glass substrate or a polymer substrate, but is not limited thereto. As the glass substrate, soda-lime glass, barium- or strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass or quartz can be preferably used. Examples of the polymer substrate include polycarbonate, acrylic, polyethylene terephthalate, polyether sulfide, and polystyrene substrates.

At this time, the conventional wet coating method can be carried out by using coating equipment such as a roller coater, a spin coater, a slot spin coater, a slot coater (sometimes called a die coater), or an inkjet machine. Apply to obtain desired thickness.

Prebaking is performed by heating with an oven, a hot plate, or the like. At this time, the heating temperature and heating time in the prebaking are appropriately selected according to the solvent used, and may be performed at a temperature of 80 to 150° C. for 1 to 30 minutes, for example.

In addition, the exposure performed after the pre-baking is performed by an exposure machine and exposed through a photomask, so that only the portion corresponding to the pattern is exposed to light. At this time, as the light to be irradiated, for example, visible light, ultraviolet rays, X-rays, electron beams, etc. can be used.

The development process uses an alkaline aqueous solution to dissolve the unexposed portion after exposure. The purpose is to remove the photosensitive resin composition in the unexposed portion and form a desired pattern through the development. As a developer suitable for development using this alkaline aqueous solution, for example, a carbonate aqueous solution of an alkali metal or an alkaline earth metal can be used. In particular, an alkaline aqueous solution containing 1 to 3% by weight of carbonates such as sodium carbonate, potassium carbonate, and lithium carbonate is used, and a developing machine or ultrasonic cleaning machine is used at a temperature of 10 to 50°C, preferably 20 to 40°C. conduct.

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

Light conversion laminate substrate

The light conversion laminated base material according to the present invention includes a cured product of the light conversion curable composition. The light-converting laminate substrate contains a light-converting curable composition that can be coated on a glass substrate, thereby eliminating the use of solvents harmful to humans, thereby improving operator safety and product productivity.

The light conversion laminate substrate can be silicon (Si), silicon oxide (SiO _x ) or a polymer substrate, and the polymer substrate can be polyether styrene (PES) or polycarbonate (PC), etc.

The light conversion laminated base material can be formed by applying a light conversion curable composition and performing thermal curing or photo curing.

＜ image display device ＞

The image display device according to the present invention includes the above-mentioned cured film, that is, a color filter or a light conversion laminated base material. Specific examples of the image display device include the following display devices: liquid crystal displays (LCDs), organic light-emitting diode displays (OLED), liquid crystal projection equipment, display devices for game consoles, portable terminal display devices such as mobile phones , display devices for digital cameras, display devices for car navigation, etc., and color display devices are particularly suitable.

In addition to having a color filter or a light conversion laminated substrate, the image display device also includes a configuration known to those skilled in the art, and may further include, that is, the present invention may apply a color filter or a light conversion layer Image display device with pressed substrate.

The image display device including the color filter according to the present invention can have excellent characteristics in terms of light conversion efficiency, heat resistance, viscosity stability, and coating film hardness.

In the following, the invention will be described in more detail by means of examples. However, the following examples are intended to explain the present invention in more detail, and the scope of the present invention is not limited by the following examples.

＜ Example I and experimental examples i>

Synthesis example 1 : iP /ZnSe/ZnS Synthesis of 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 added to the reactor and heated to 120°C under vacuum. After 1 hour, the atmosphere in the reactor was changed to nitrogen. After heating to 280°C, quickly inject a mixed solution of 0.2 mmol (58 μl) of tris(trimethylsilyl)phosphine (TMS3P) and 1.0 ml of trioctylphosphine, and react for 0.5 minutes.

Then, 2.4 mmol (0.448 g) zinc acetate, 4.8 mmol oleic acid and 20 ml trioctylamine were added to the reactor and heated to 120°C under vacuum. After 1 hour, the atmosphere in the reactor was changed to nitrogen, and the temperature of the reactor was raised to 280°C. 2 ml of the previously synthesized InP core solution was added, followed by 4.8 mmol of selenium in trioctylphosphine solution (Se/TOP), and the final mixture was allowed to react for 2 h. Ethanol is added to the reaction solution that is quickly cooled to room temperature, and the precipitate obtained after centrifugation is filtered under reduced pressure and dried under reduced pressure to form an InP/ZnSe core-shell structure.

Then, 2.4 mmol (0.448 g) zinc acetate, 4.8 mmol oleic acid and 20 ml trioctylamine were added to the reactor and heated to 120°C under vacuum. After 1 hour, the atmosphere in the reactor was changed to nitrogen, and the temperature of the reactor was raised to 280°C. 2 ml of the previously synthesized InP core solution was added, followed by 4.8 mmol of sulfur in trioctylphosphine (S/TOP), and the final mixture was allowed to react for 2 h. Ethanol was added to the reaction solution that was rapidly cooled to room temperature, and the precipitate obtained after centrifugation was filtered under reduced pressure and dried under reduced pressure.

The obtained quantum dot powder was dispersed in chloroform so that the solid content was 10%, thereby obtaining a quantum dot solution with an InP/ZnSe/ZnS core-shell structure. The maximum emission wavelength is 535 nanometers.

Example I-1-1 to 1-7 and comparative example I-1-1 to 1-4 : Preparation of quantum dots and quantum dot dispersions

Example I-1-1 : Ligand substitution reaction 1 ( A-1 )

Add 5 ml of the quantum dot solution obtained in Synthesis Example 1 to a centrifuge tube and add 20 ml of ethanol to perform precipitation. Separate by centrifugation and remove the supernatant, add 3 ml of chloroform to the precipitate to disperse the quantum dots, then add 1.0 g of the compound represented by the following chemical formula 1-1, and heat to 60°C under a nitrogen atmosphere for reaction 1 hours.

Next, 25 ml of n-hexane was added to the reactant to precipitate the quantum dots. The precipitate was separated by centrifugation and dried in a vacuum oven at 60°C for 3 hours to obtain ligand-substituted quantum dot powder (A -1). 1,6-hexanediol diacrylate was added to the obtained quantum dot powder so that the solid content was 50%, and then stirred to prepare a quantum dot dispersion liquid. The maximum emission wavelength is 535 nanometers. [Chemical formula 1-1]

Example I-1-2 , ligand substitution reaction 2 ( A-2 )

The preparation was performed using the same method as in Example I-1-1 except that the compound represented by Chemical Formula 1-2 was used instead of the ligand used in Example I-1-1. The maximum emission wavelength is 536 nanometers. [Chemical formula 1-2]

Example I-1-3 , ligand substitution reaction 3 ( A-3 )

The preparation was performed using the same method as in Example I-1-1 except that the compound represented by Chemical Formula 1-3 was used instead of the ligand used in Example I-1-1. The maximum emission wavelength is 536 nanometers. [Chemical formula 1-3]

Example I-1-4 , ligand substitution reaction 4 ( A-4 )

The preparation was performed using the same method as in Example I-1-1 except that the compound represented by Chemical Formula 1-4 was used instead of the ligand used in Example I-1-1. The maximum emission wavelength is 535 nanometers. [Chemical formula 1-4]

Example I-1-5 , ligand substitution reaction 5 ( A-5 )

The preparation was performed using the same method as in Example I-1-1 except that the compound represented by Chemical Formula 1-5 was used instead of the ligand used in Example I-1-1. The maximum emission wavelength is 535 nanometers. [Chemical formula 1-5]

Example I-1-6 , ligand substitution reaction 6 ( A-6 )

The preparation was performed using the same method as in Example I-1-1 except that the compound represented by Chemical Formula 1-6 was used instead of the ligand used in Example I-1-1. The maximum emission wavelength is 535 nanometers. [Chemical formula 1-6]

Example I-1-7 , ligand substitution reaction 7 ( A-7 )

The preparation was performed using the same method as in Example I-1-1 except that the compound represented by Chemical Formula 1-7 was used instead of the ligand used in Example I-1-1. The maximum emission wavelength is 536 nanometers. [Chemical formula 1-7]

Comparative example I-1-1 : Quantum dot dispersion without ligand exchange reaction ( A-8 )

Add 5 ml of the quantum dot solution obtained in Synthesis Example 1 to a centrifuge tube, and add 20 ml of ethanol to precipitate the quantum dots. After removing the supernatant and separating the precipitate, it was dried in a 60°C oven for 3 hours. 1,6-hexanediol diacrylate was added to the obtained quantum dot powder so that the solid content was 50%, and then stirred to prepare a quantum dot dispersion liquid. The maximum emission wavelength is 536 nanometers.

Comparative example I-1-2 : Ligand substitution reaction 8 ( A-9 )

The same method as in Example I-1-1 was used except that the following Chemical Formula 3-1 was used instead of the ligand used in Example I-1-1. The maximum emission wavelength is 535 nanometers. [Chemical formula 3-1]

Comparative example I-1-3 : Ligand substitution reaction 9 ( A-10 )

The same method as in Example I-1-1 was used except that the following Chemical Formula 3-2 was used instead of the ligand used in Example I-1-1. The maximum emission wavelength is 536 nanometers. [Chemical formula 3-2]

Comparative example I-1-4 : Ligand substitution reaction 10 ( A-11 )

The same method as in Example I-1-1 was used except that the following Chemical Formula 3-3 was used instead of the ligand used in Example I-1-1. The maximum emission wavelength is 535 nanometers. [Chemical formula 3-3]

Example I-2-1 to I-2-11 and comparative example I-2-1 to I-2-5 : Preparation of photoconversion curable composition

A photoconversion curable composition was prepared according to the components and contents described in Table 1 below.

[Table 1] (weight%) Example Comparative example 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 2-1 2-2 2-3 2-4 Quantum dot dispersion A-1 50 - - - - - - 50 50 50 50 - - - - A-2 - 50 - - - - - - - - - - - - - A-3 - - 50 - - - - - - - - - - - - A-4 - - - 50 - - - - - - - - - - - A-5 - - - - 50 - - - - - - - - - - A-6 - - - - - 50 - - - - - - - - - A-7 - - - - - - 50 - - - - - - - - A-8 - - - - - - - - - - - 50 - - - A-9 - - - - - - - - - - - - 50 - - A-10 - - - - - - - - - - - - - 50 - A-11 - - - - - - - - - - - - - - 50 photopolymerizable compound B-1 39 39 39 39 39 39 39 39 39 39 44 39 39 39 39 Photopolymerization initiator C-1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Antioxidants D-1 5 5 5 5 5 5 5 - - - - 5 5 5 5 D-2 - - - - - - - 5 - - - - - - - D-3 - - - - - - - - 5 - - - - - - D-4 - - - - - - - - - 5 - - - - - scattering particles E-1 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 - A-1 to A-7: Quantum dot dispersions according to Examples I-1-1 to I-1-7 - A-8 to A-11: According to Comparative Examples I-1-1 to I-1- Quantum dot dispersion of 4 - B-1: 1,6-hexanediol diacrylate (Aldrich Company) - C-1: Irgacure OXE-01 (BASF Company) - D-1: Sumilizer GP (Sumitomo Chemical Company; MW 661) - D-2: Irganox 1035 (BASF) - D-3: 135A (ADEKA) - D-4: AO-40 (ADEKA) - E-1: TiO ₂ (Huntsmann, TR -88, particle size 220 nm)

Experimental example I

( 1 ) Preparation of light conversion coating

Each photoconversion curable composition prepared in Examples I-2-1 to I-2-11 and Comparative Examples I-2-1 to I-2-5 was coated on a 5 cm × 5 cm surface by inkjet method. on a glass substrate, and then irradiated with 395 nanometer blue LED light at 4000 millijoules/square centimeters (mJ/cm ² ) under nitrogen protection, and then heated in a heating oven at 180°C for 30 minutes to prepare the light Conversion coating. The film thickness of the prepared light conversion coating was measured using a film thickness meter (Dektak 6M, Vecco Corporation), and the following evaluation was performed on a 10 μm coating film.

( 2 )Evaluation of light conversion efficiency

The prepared light conversion coating was placed on a blue light source (XLamp conversion efficiency, and the results are shown in Table 2 below. As the light conversion efficiency (%) is higher, excellent brightness can be obtained. [Formula 1]

( 3 )Heat resistance evaluation

When preparing the light conversion coating, measure the light conversion efficiency before and after baking at 180°C for 30 minutes, and calculate the light retention after baking by the following formula 2 to evaluate the heat resistance, and the results are shown in in Table 2 below. It can be determined that the higher the light retention rate, the better the heat resistance. [Formula 2] Light retention rate (%) = (luminous efficiency after baking at 180°C for 30 minutes) / (luminous efficiency before baking) × 100

( 4 ) Viscosity stability evaluation

For the photoconversion curable composition prepared above, use an R-type viscometer (VISCOMETER MODELRE120L SYSTEM, manufactured by Toki Sangyo Co., Ltd.) to measure the initial viscosity at a rotation speed of 20 rpm and a temperature of 25°C or 40°C and save 1 viscosity after months. Calculate the viscosity change rate (%) of the initial viscosity, and evaluate the viscosity stability according to the following evaluation criteria and record it in Table 2. ＜Evaluation criteria＞ ◎: Viscosity change rate is less than 105% ○: Viscosity change rate is greater than 105% and less than 110% △: Viscosity change rate is greater than 110% and less than 120% ×: Viscosity change rate is greater than 120%

( 5 )Coating film hardness evaluation

The curing degree of the prepared light conversion coating was measured at a high temperature of 150°C using a hardness tester (HM500; Fischer Company), and the coating film hardness was evaluated according to the following evaluation criteria. The results are shown in Table 2 below. <Coating film hardness evaluation criteria> ○: Surface hardness is 50 millinewtons/square meter (mN/mm ² ) or more △: Surface hardness is 30 millinewtons/square meters or more and less than 50 millinewtons/square meters ×: Surface hardness less than 30 millinewton/square meter

[Table 2] Evaluation results Light conversion efficiency Luminescence retention rate (after baking/before baking) Viscosity stability (25℃) Viscosity stability (40℃) Film hardness Example I-2-1 33% 93% ◎ ○ ○ Example I-2-2 30% 93% ◎ ○ ○ Example I-2-3 31% 92% ◎ ○ ○ Example I-2-4 32% 94% ◎ △ ○ Example I-2-5 32% 94% ◎ ○ ○ Example I-2-6 31% 92% ◎ △ ○ Example I-2-7 31% 93% ◎ ○ ○ Example I-2-8 32% 91% ◎ ○ ○ Example I-2-9 32% 92% ◎ ○ ○ Example I-2-10 31% 90% ○ △ ○ Example I-2-11 30% 89% ○ △ △ Comparative example I-2-1 25% 82% △ × × Comparative example I-2-2 28% 85% × × △ Comparative example I-2-3 27% 83% △ × △ Comparative example I-2-4 30% 87% ○ × △ Comparative example I-2-5 twenty four% 81% × × ×

Referring to Table 2, it was confirmed that the photoconversion curable compositions of Examples I-2-1 to I-2-11 including the coordination group layer represented by Chemical Formula 1 had a photoconversion efficiency of 30% or more. The final light retention rate is more than 89%, the viscosity change rate at 25°C is less than 110%, the viscosity change rate at 40°C is less than 120%, and the surface hardness of the coating film is more than 30 millinewtons/square meter, without The light conversion efficiency, light retention after baking, viscosity change rate and/or coating of the light conversion curable compositions of Comparative Examples I-2-1 to I-2-5 including the coordination group layer represented by Chemical Formula 1 The hardness of the film surface is significantly reduced.

In addition, it was confirmed that the photocurable compositions of Examples I-2-1 to I-2-10 that also contained antioxidants showed excellent coating film hardness, especially those containing phosphorus-based antioxidants or sulfur-based antioxidants. The photoconversion curable compositions of Examples I-2-1 to I-2-9 of the oxidizing agent exhibit better viscosity stability at 25°C and 40°C respectively.

Therefore, it was confirmed that the photoconversion curable composition containing quantum dots of the coordination group layer represented by Chemical Formula 1 is superior in photoconversion efficiency and heat resistance compared with the photoconversion curable composition not containing such quantum dots. , excellent performance in viscosity stability and coating film hardness.

＜ Example II and experimental examples II>

Synthesis example 2 : iP /ZnSe/ZnS Synthesis of core-shell quantum dots

Add 0.4 mmol (0.058 g) of indium acetate, 0.6 mmol (0.15 g) of palmitic acid and 20 ml of 1-octadecene into the reactor, and heat to 120°C under vacuum. After 1 hour, the atmosphere in the reactor was changed to nitrogen. After heating to 280°C, a mixed solution of 0.2 mmol (58 μl) tris(trimethylsilyl)phosphine (TMS3P) and 1.0 ml trioctylphosphine was quickly injected and allowed to react for 0.5 minutes.

Then 2.4 mmol (0.448 g) zinc acetate, 4.8 mmol oleic acid and 20 ml trioctylamine were added to the reactor and heated to 120°C under vacuum. After 1 hour, the atmosphere in the reactor was changed to nitrogen, and the temperature of the reactor was raised to 280°C. 2 ml of the previously synthesized InP core solution was added, followed by 4.8 mmol of selenium in trioctylphosphine (Se/TOP), and the final mixture was allowed to react for 2 h. Ethanol is added to the reaction solution that is quickly cooled to room temperature, and the precipitate obtained after centrifugation is filtered under reduced pressure and dried under reduced pressure to form an InP/ZnSe core-shell structure.

Then, 2.4 mmol (0.448 g) zinc acetate, 4.8 mmol oleic acid and 20 ml trioctylamine were charged into the reactor and heated to 120°C under vacuum. After 1 hour, the atmosphere in the reactor was changed to nitrogen, and the temperature of the reactor was raised to 280°C. 2 ml of the previously synthesized InP core solution was added, followed by 4.8 mmol of sulfur in trioctylphosphine (S/TOP), and the final mixture was allowed to react for 2 h. Ethanol is added to the reaction solution that is quickly cooled to room temperature, and the precipitate obtained after centrifugation is filtered under reduced pressure and dried under reduced pressure to obtain quantum dots with an InP/ZnSe/ZnS core-shell structure, and disperse them in in chloroform. The solid content was adjusted to 10%. The maximum emission wavelength is 535 nanometers.

Example II-1-1 to II-1-8 and comparative example II-1-1 to II-1-3 : Preparation of quantum dots and quantum dot dispersions

Example II-1-1 : Ligand substitution reaction 1 ( A-1 )

Place 5 ml of the quantum dot solution obtained in Synthesis Example 2 into a centrifuge tube and add 20 ml of ethanol to precipitate. Separate by centrifugation and remove the supernatant, add 3 ml of chloroform to the precipitate to disperse the quantum dots, then add 1.0 g of the compound represented by the following chemical formula 2-1, and heat to 60°C under a nitrogen atmosphere for reaction 1 hours. After adding 25 ml of n-hexane to the reaction product to precipitate the quantum dots, the precipitate was separated by centrifugation and dried in a vacuum oven at 60° C. for 3 hours. 1,6-hexanediol diacrylate was added to the obtained quantum dot powder so that the solid content was 50%, and then stirred to prepare a quantum dot dispersion liquid. The maximum emission wavelength is 535 nanometers. [Chemical formula 2-1]

Example II-1-2 : Ligand substitution reaction 2 ( A-2 )

The preparation was performed using the same method as in Example II-1-1 except that the compound represented by Chemical Formula 2-2 was used instead of the ligand used in Example II-1-1. The maximum emission wavelength is 525 nanometers. [Chemical formula 2-2]

Example II-1-3 : Ligand substitution reaction 3 ( A-3 )

The preparation was performed using the same method as in Example II-1-1 except that the compound represented by Chemical Formula 2-3 was used instead of the ligand used in Example II-1-1. The maximum emission wavelength is 526 nanometers. [Chemical formula 2-3]

Example II-1-4 : Ligand substitution reaction 4 ( A-4 )

The preparation was performed using the same method as in Example II-1-1 except that the compound represented by Chemical Formula 2-4 was used instead of the ligand used in Example II-1-1. The maximum emission wavelength is 525 nanometers. [Chemical formula 2-4]

Example II-1-5 : Ligand substitution reaction 5 ( A-5 )

The preparation was performed using the same method as in Example II-1-1 except that the compound represented by Chemical Formula 2-5 was used instead of the ligand used in Example II-1-1. The maximum emission wavelength is 525 nanometers. [Chemical formula 2-5]

Example II-1-6 : Ligand substitution reaction 6 ( A-6 )

The preparation was performed using the same method as in Example II-1-1 except that the compound represented by Chemical Formula 2-6 was used instead of the ligand used in Example II-1-1. The maximum emission wavelength is 526 nanometers. [Chemical formula 2-6]

Example II-1-7 : Ligand substitution reaction 7 ( A-7 )

The preparation was performed using the same method as in Example II-1-1 except that the compound represented by Chemical Formula 2-7 was used instead of the ligand used in Example II-1-1. The maximum emission wavelength is 525 nanometers. [Chemical formula 2-7]

Example II-1-8 : Ligand substitution reaction 8 ( A-8 )

The preparation was performed using the same method as in Example II-1-1 except that the compound represented by Chemical Formula 2-8 was used instead of the ligand used in Example II-1-1. The maximum emission wavelength is 526 nanometers. [Chemical formula 2-8]

Comparative example II-1-1 : Ligand substitution reaction 9 ( A-9 )

The same method as in Example II-1-1 except that 2-[2-(2-methoxyethoxy)ethoxy]acetic acid is used instead of the ligand used in Example II-1-1. Make preparations. The maximum emission wavelength is 525 nanometers.

Comparative example II-1-2 : Ligand substitution reaction 10 ( A-10 )

The same method as in Example II-1-1 was used for preparation except that monoethyl succinate was used instead of the ligand used in Example II-1-1. The maximum emission wavelength is 525 nanometers.

Comparative example II-1-3 : Ligand substitution reaction 11 ( A-11 )

The preparation was carried out using the same method as in Example II-1-1 except that N-propylglycine was used instead of the ligand used in Example II-1-1. The maximum emission wavelength is 526 nanometers.

Example II-2-1 to II-2-12 and comparative examples II-2-1 to II-2-4 : Preparation of photoconversion curable composition

A photoconversion curable composition was prepared according to the components and contents described in Table 3 to Table 4 below.

[table 3] (weight%) [01] Example 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 2-12 Quantum dot dispersion 50 - - - - - - - 50 50 50 50 50 - 50 - - - - - - - - - - - - - 50 - - - - - - - - - - - - - 50 - - - - - - - - - - - - - 50 - - - - - - - - - - - - - 50 - - - - - - - - - - - - - 50 - - - - - - - - - - - - - 50 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Photopolymerizable monomer 39 39 39 39 39 39 39 39 39 39 39 44 44 Photopolymerization initiator 1 1 1 1 1 1 1 1 1 1 1 1 1 Antioxidants 5 5 5 5 5 5 5 5 - - - - - - - - - - - - - 5 - - - - - - - - - - - - - 5 - - - - - - - - - - - - - 5 - - scattering particles 5 5 5 5 5 5 5 5 5 5 5 5 5

[Table 4] [01] (weight%) [02] Comparative example 2-1 2-2 2-3 2-4 Quantum dot dispersion A-1 - - - - A-2 - - - - A-3 - - - - A-4 - - - - A-5 - - - - A-6 - - - - A-7 - - - - A-8 - - - - A-9 50 - - 50 A-10 - 50 - - A-11 - - 50 - Photopolymerizable monomer B-1 39 39 39 44 Photopolymerization initiator C-1 1 1 1 1 Antioxidants D-1 5 5 5 - D-2 - - - - D-3 - - - - D-4 - - - - scattering particles E-1 5 5 5 5 - A-1 to A-8: Quantum dot dispersions according to Examples II-1-1 to II-1-8 - A-9 to A-11: According to Comparative Examples II-1-1 to II-1- Quantum dot dispersion of 3 - B-1: 1,6-hexanediol diacrylate (Aldrich Company) - C-1: Irgacure OXE-01 (BASF Company) - D-1: Sumilizer GP (Sumitomo Chemical Company; MW 661) - D-2: Irganox 1035 (BASF) - D-3: 135A (ADEKA) - D-4: AO-40 (ADEKA) - E-1: TiO ₂ (Huntsmann, TR -88, particle size 220 nm)

Experimental example II

( 1 ) Preparation of light conversion coating

Each photocurable composition prepared in Examples II-2-1 to II-2-12 and Comparative Examples II-2-1 to II-2-4 was coated on a 5 cm × 5 cm area by inkjet method. On the glass substrate, a light conversion coating was then prepared by heating in a heating oven at 180°C for 30 minutes after irradiation with a 395 nm blue LED lamp at 4000 mJ/cm2 under nitrogen. The film thickness of the prepared light conversion coating was measured using a film thickness meter (Dektak 6M, Vecco Corporation), and the following evaluation was performed for a 10-micron coating film.

( 2 ) Lightfastness evaluation

After the prepared light conversion coating was placed in a blue light source (XLamp XR-E LED, Royal blue 450, Cree) for 1 hour, the maintenance rate (%) of the initial light conversion efficiency was confirmed to evaluate the light resistance. The results are shown in Table 5 below.

( 3 ) Evaluation of high temperature and high humidity resistance

After the prepared light conversion coating was deposited with _SiOx , it was placed above a blue light source (XLamp After the same light conversion coating was exposed for 24 hours in a high-temperature and high-humidity treatment device (TH-PE manufactured by Jeio Tech) with a temperature of 85°C and a humidity of 85%, the brightness was measured in the same way as above, according to the following formula 2 The brightness retention rate after high temperature and high humidity treatment was calculated to evaluate the high temperature and high humidity resistance. It can be judged that the higher the numerical value, the better the high temperature and high humidity resistance. The results are shown in Table 5 below. [Formula 2] Brightness retention rate (%) = (brightness after treatment for 24 hours at a temperature of 85°C and a humidity of 85%) / (brightness before treatment for 24 hours at a temperature of 85°C and a humidity of 85%) × 100

( 4 )Surface roughness evaluation

The surface roughness of the prepared light conversion coating was measured using a surface roughness meter DEKTAK-6M (Veeco Company), and the surface roughness was evaluated according to the following evaluation criteria. The results are shown in Table 5 below. ＜Evaluation criteria＞ ◎: Surface roughness less than 10 nanometers ○: Surface roughness is greater than 10 nanometers and less than 15 nanometers △: Surface roughness is greater than 15 nanometers and less than 20 nanometers ×: Surface roughness is greater than 20 nanometers

( 5 ) Adhesion evaluation

The prepared light conversion coating was subjected to a cross-hatch test according to ASTM D3359, and the adhesion was evaluated according to the following evaluation criteria. While applying even force to the prepared coating with a knife, cut it into a grid shape, stick the tape on the cut surface and rub it until it is completely adhered, and after 30 seconds, hold the end of the tape and pull it close Remove the tape at a 180-degree angle and evaluate the adhesion of the coating according to the following criteria. The results are shown in Table 3 below. ＜Evaluation criteria＞ OB: Broken into thin pieces and more than 65% of the area falling off 1B: The area of the end of the cutting part and the grid falling off is more than 35% and less than 65% 2B: The area where part of the intersection of the cutting site has fallen off is more than 15% and less than 35% 3B: The area where part of the intersection of the cutting site has fallen off is more than 5% and less than 15% 4B: The area where part of the intersection of the cutting part falls off is less than 5% 5B: The edge of the cutting part is smooth and no grid falls off.

[table 5] Lightfastness (%) High temperature and high humidity resistance (%) Adhesion Surface roughness Example II-2-1 83 78 4B ◎ II-2-2 82 79 5B ◎ II-2-3 80 78 3B ○ II-2-4 82 78 4B ◎ II-2-5 81 80 5B ○ II-2-6 82 79 4B ◎ II-2-7 80 77 4B ○ II-2-8 81 80 5B ◎ II-2-9 82 78 4B ◎ II-2-10 83 80 4B ◎ II-2-11 80 76 3B ○ II-2-12 79 75 3B ○ Comparative example II-2-1 76 67 1B △ II-2-2 74 68 2B △ II-2-3 72 67 1B × II-2-4 75 65 1B ×

Referring to Table 5, it can be confirmed that the light conversion curable compositions of Examples II-2-1 to II-2-12 including the coordination group layer represented by Chemical Formula 2 have a light resistance of 79% or more and a high temperature resistance. Comparison where the wettability is 75% or more, the area where part of the intersecting portion of the cut portion falls off in the adhesion evaluation is less than 15%, and the surface roughness is 10 nanometers or less, excluding the coordination base layer represented by Chemical Formula 2 The light resistance of the photoconversion curable composition of the example is less than 79%, the high temperature resistance is less than 70%, and the area that falls off in the adhesion evaluation is more than 15% and less than 65%, and the surface roughness exceeds 15 nanometers.

Therefore, it was confirmed that the photoconversion curable composition containing the quantum dots containing the coordination group layer represented by Chemical Formula 2 is superior in light resistance and high temperature resistance compared with the photoconversion curable composition not containing such quantum dots. Excellent performance in high wettability, adhesion and surface roughness.

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Claims (15)

A quantum dot having a ligand layer on its surface, the ligand layer containing at least one of the compounds represented by the following Chemical Formula 1 and Chemical Formula 2: [Chemical Formula 1] , in Chemical Formula 1, A _a is a thiol group, amine group, imidazole group or carboxyl group, L _a is a thiol group, amine group or carboxyl group, R _a is a linear or branched chain having 1 to 20 carbon atoms Trivalent hydrocarbon group, X _a is a direct bond, -OC(=O)-, -C(=O)O-, -C(=O)NH- or -HNC(=O)-, Y _a is a Straight-chain or branched alkanediyl groups of 20 carbon atoms, , or , n is an integer from 1 to 15, m is an integer from 1 to 10, Z is an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, or an alkyl group having 6 to 20 carbon atoms. Aromatic hydrocarbon groups, or photopolymerizable reactive groups with 2 to 20 carbon atoms, and there is no case where A _a and L _a are both thiol groups, [Chemical Formula 2] , in Chemical Formula 2, A ¹ is a thiol group, amine group or carboxyl group, L ¹ and L ² are each independently a direct bond or a linear or branched alkanediyl group having 1 to 3 carbon atoms, R ¹ is -OC(=O)-, -C(=O)O-, -C(=O)-, -C(=S)S-, -SC(=S)-, -C(=O)NH- , -HNC(=O)-, -SC(=O)-, -C(=O)S-, -HNC(=O)NH-, -SC(=S)S-, -OC(=O) O- or -C(=O)OC(=O)-, R ² is -OC(=O)-, -C(=O)O-, -C(=O)-, -C(=S) S-, -SC(=S)-, -C(=O)NH-, -HNC(=O)-, -HNC(=O)NH-, -SC(=S)S-, -OC(= O)O- or -C(=O)OC(=O)-, X ¹ is a direct bond, a linear or branched alkanediyl group with 1 to 20 carbon atoms, , or , n is an integer from 1 to 15, m is an integer from 1 to 10, Y ¹ is an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or an alkoxy group having 3 to 20 carbon atoms. cycloalkyl group, aromatic hydrocarbon group having 6 to 30 carbon atoms, or photopolymerizable reactive group having 2 to 20 carbon atoms. The quantum dot according to claim 1, wherein the photopolymerizable reactive group of Chemical Formula 1 or Chemical Formula 2 is an alkenyl group, an alkynyl group or an acrylate group. The quantum dot as claimed in claim 1, wherein, in Chemical Formula 2, R ¹ is -OC(=O)-, -C(=O)O-, -C(=O)NH-, -HNC(= O)-, -C(=O)-, -C(=S)S-, -SC(=S)-, -OC(=O)O- or -C(=O)OC(=O)- , R ² is -OC(=O)-, -C(=O)O-, -C(=O)NH-, -HNC(=O)-, -C(=O)-, -C(= S)S-, -SC(=S)-, -OC(=O)O- or -C(=O)OC(=O)-. The quantum dot as described in claim 1, wherein the quantum dot has a core-shell structure, which includes a core and a shell covering the core, wherein, The core includes compounds composed of two or more of the following groups: In, P, Zn, Ga, Cd, Se, S, Te, Pb, Ag, Hg, N, As and O, The shell contains at least one compound consisting of two or more of the following groups: In, P, Zn, Ga, Cd, Se, S, Te, Pb, Hg, N, As, O, Mn, and Sr . A quantum dot dispersion liquid comprising the quantum dots described in any one of claims 1 to 4, and at least one of a photopolymerizable compound and a solvent. The quantum dot dispersion of claim 5, wherein the photopolymerizable compound includes at least one selected from the following group: 2-hydroxyethyl acrylate, 1,4-butanediol di(methyl) Acrylate, 1,6-hexanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate , dipropylene glycol di(meth)acrylate, and tripropylene glycol di(meth)acrylate. A photoconversion curable composition comprising the quantum dot dispersion liquid according to claim 5. The photoconversion curable composition according to claim 7, further comprising at least one selected from the following: scattering particles, photopolymerizable compounds, photopolymerization initiators and antioxidants. The photoconversion curable composition according to claim 8, wherein the photopolymerizable compound includes at least one selected from the following groups: 2-hydroxyethyl acrylate, 1,4-butanediol di(methyl acrylate, 1,6-hexanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate Acrylates, dipropylene glycol di(meth)acrylate, and tripropylene glycol di(meth)acrylate. The light conversion curable composition according to claim 8, wherein the scattering particles contain TiO ₂ . The photoconversion curable composition according to claim 8, wherein the antioxidant includes at least one selected from the following: phosphorus antioxidants, phenolic antioxidants and sulfur antioxidants. The photoconversion curable composition according to claim 11, wherein the antioxidant includes at least one selected from the following: phosphorus antioxidants and sulfur antioxidants. A cured film formed using the photoconversion curable composition according to claim 7. The cured film according to claim 13, wherein the cured film is a color filter or a light conversion laminated substrate. An image display device including the cured film according to claim 13.