KR20230121342A - Quantum composition, curable pattern formed from the same, and display device including the curable pattern - Google Patents

Abstract

Quantum dot compositions according to embodiments of the present invention include quantum dot particles and a carboxylic acid compound represented by Chemical Formula 1. Dispersibility of quantum dot particles in polar solvents may be enhanced by the carboxylic acid compound, and excellent optical properties and stability over time may be obtained. In addition, a cured pattern having excellent light conversion efficiency and durability, and a display device including the same may be provided from the quantum dot composition described above.

Description

Quantum dot composition, curing pattern formed therefrom, and a display device including the same

The present invention relates to a quantum dot composition, a curing pattern formed therefrom, and a display device including the same. More specifically, it relates to a quantum dot composition including quantum dot particles and a carboxylic acid compound, a curing pattern formed therefrom, and a display device including the same.

A color filter is a thin film type optical component that extracts three colors of red, green, and blue from white light and functions in a fine pixel unit, and the size of one pixel is about tens to hundreds of micrometers. The color filter is a black matrix layer formed in a predetermined pattern on a transparent substrate to block the boundary between each pixel and a plurality of colors (typically, red (R), green (G) and It has a structure in which pixel units in which three primary colors of blue (B) are arranged in a predetermined order are sequentially stacked. In general, color filters can be produced by coating three or more colors on a transparent substrate by dyeing, electrodeposition, printing, pigment dispersion, etc. Recently, pigment dispersion using pigment dispersion type photosensitive resin is mainly used. there is.

According to the pigment dispersion method, which is one of the methods for realizing a color filter, first, a photosensitive "resin" composition including a colorant, an alkali-soluble "resin, a photopolymerization monomer, a photopolymerization initiator, an epoxy" resin, a solvent, and other additives is placed on a transparent substrate provided with a black matrix. coated on the substrate. Thereafter, a colored thin film may be formed by repeating a series of processes of exposing the pattern to be formed, removing the non-exposed portion with a solvent, and curing it with heat.

However, color reproduction is realized by passing light emitted from a light source through a color filter, and in this process, light efficiency may decrease because a part of the light is absorbed by the color filter. In addition, perfect color reproducibility may not be secured due to the characteristics of the pigment as a color filter.

Korean Patent Publication No. 10-2012-112188 discloses an example of a red coloring composition for a color filter and a color filter.

Korean Patent Publication No. 10-2012-112188

One object of the present invention is to provide a quantum dot composition having excellent optical properties and dispersibility.

One object of the present invention is to provide a curing pattern formed from the above-described quantum dot composition and a display device including the same.

A quantum dot composition according to exemplary embodiments may include quantum dot particles and a carboxylic acid compound represented by Chemical Formula 1 below.

[Formula 1]

In Formula 1, R may be an aliphatic hydrocarbon group having 1 to 10 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms. Rf may be a fluorinated alkylene group having 1 to 10 carbon atoms, and in one embodiment, Rf may contain at least one ether group (-O-). Ro is an oxyalkylene group having 1 to 10 carbon atoms, and n may be an integer of 1 to 10.

According to exemplary embodiments, the carboxylic acid compound may include a compound represented by Formula 2 below.

[Formula 2]

In Formula 2, R may be an aliphatic hydrocarbon group having 1 to 10 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms. Rf may be a fluorinated alkylene group having 1 to 10 carbon atoms, and in one embodiment, Rf may contain at least one ether group (-O-). n may be an integer from 1 to 10.

In some embodiments, in Chemical Formulas 1 and 2, Rf may be a fluorinated alkylene group having 1 to 10 carbon atoms in which all hydrogen atoms are substituted with fluorine atoms.

In some embodiments, the carboxylic acid compound may include at least one of compounds represented by Chemical Formulas 3 to 10 below.

[Formula 3]

[Formula 4]

[Formula 5]

[Formula 6]

[Formula 7]

[Formula 8]

[Formula 9]

[Formula 10]

According to example embodiments, the carboxylic acid compound may coordinately bind to the surface of the quantum dot particle. For example, the carboxyl group of the carboxylic acid compound may coordinately bond with a metal atom on the surface of the quantum dot particle.

According to exemplary embodiments, the quantum dot particle may include at least one selected from the group consisting of a group II-VI compound, a group III-V compound, a group IV-VI compound, and a group IV element or a compound containing the same. can

In some embodiments, the quantum dot particle may include a core and a shell covering the core. For example, the core may include indium (In) or phosphorus (P), and the shell may include zinc (Zn), selenium (Se), or sulfur (S).

According to exemplary embodiments, the average particle diameter of the quantum dot particles may be 5 nm to 12 nm. For example, the average particle diameter of the core of the quantum dot particle may be 2 nm to 5 nm, and the thickness of the shell of the quantum dot particle may be 2 nm to 10 nm.

In some embodiments, the shell may include a first shell layer covering the core and a second shell layer covering the first shell layer, the core may include InP or InZnP, and the first shell layer may include ZnSe or ZnSeS may be included, and the second shell layer may include ZnS.

According to exemplary embodiments, the content of the carboxylic acid compound may be 30 parts by weight to 150 parts by weight based on 100 parts by weight of the quantum dot particles.

According to exemplary embodiments, the content of the quantum dot particles may be 1% to 50% by weight of the total weight of the solid content of the quantum dot composition.

The quantum dot composition according to example embodiments may further include at least one of a binder resin, a polymerizable compound, a polymerization initiator, and a solvent.

A curing pattern according to exemplary embodiments may be formed from the above-described quantum dot composition, and a display device may include the above-described curing pattern.

A quantum dot composition according to embodiments of the present invention may include quantum dot particles and a carboxylic acid compound. The carboxylic acid compound may be chemically bonded to the surface of the quantum dot particle. In this case, the solubility of the quantum dot particles in polar solvents may be improved by the carboxylic acid compound, and structural stability may be further enhanced.

In addition, the carboxylic acid compound may include a compound represented by a specific chemical formula. In this case, contact between an oxidizing substance such as oxygen or moisture and the quantum dot particles may be suppressed, and oxidation/damage of the quantum dot particles due to an external environment may be prevented. Accordingly, light emitting characteristics and light conversion efficiency of the quantum dot composition or cured pattern may be improved, and storage stability may be further improved.

In addition, as the carboxylic acid compound includes an oxyalkylene group or an ester group, dispersibility in polar solvents can be further enhanced. Therefore, aggregation of quantum dot particles in a polar solvent can be suppressed, and high color reproducibility, a wide viewing angle, and excellent light emitting properties can be provided.

In addition, the quantum dot particle may have a core-shell structure. Therefore, the carboxylic acid compound can more stably bind to the surface of the quantum dot particle, and damage to the core can be prevented by the shell covering the core, so optical properties can be improved.

In addition, a cured pattern having excellent optical properties and durability using the above-described quantum dot composition and a display device including the cured pattern may be provided.

Quantum dot compositions according to embodiments of the present invention include quantum dot particles and a carboxylic acid compound, and the carboxylic acid compound may include a compound represented by Chemical Formula 1. For example, the carboxylic acid compound may passivate the quantum dot particle by chemically binding to the surface of the quantum dot particle, and may serve as a ligand.

In addition, a cured pattern including a cured product of the quantum dot composition and a display device including the cured pattern are provided. As the curing pattern includes the quantum dot particles and the carboxylic acid compound, optical properties and durability may be excellent.

Hereinafter, embodiments of the present invention will be described in detail. When there is an isomer of a compound or resin represented by a chemical formula used in this application, the compound or resin represented by the chemical formula means a representative chemical formula including the isomer.

<Quantum dot composition>

A quantum dot composition according to example embodiments may include quantum dot particles and a carboxylic acid compound. The carboxylic acid compound may be disposed on the surface of the quantum dot particle, and for example, the quantum dot composition may include the quantum dot particle surface-modified with the carboxylic acid compound.

A quantum dot particle may mean a nano-sized semiconductor material. Specifically, atoms form molecules, and molecules form an aggregate of small molecules called a cluster to form nanoparticles. When the nanoparticles described above have particularly semiconductor properties, the nanoparticles are referred to as quantum dot particles.

The quantum dot particle reaches an excited state by receiving energy from the outside, and may emit energy (eg, light) according to an energy bandgap of the quantum dot itself. Specifically, the quantum dot particle may be capable of photo luminescence emitting light by light irradiation or electro luminescence emitting light by applying an electric current. Quantum dot particles can be applied as light-emitting materials in various fields such as display devices, energy devices, or bioluminescent devices due to the above-described light-emitting properties.

For example, the quantum dot particles may be used in a liquid crystal diodes (LCD)-based display using a light emitting device or a quantum dot light emitting diodes (QLED) based display using an electroluminescent device.

The quantum dot composition and the curing pattern according to exemplary embodiments include the above-described quantum dot particles, and thus may self-emit by, for example, light irradiation or current application.

An energy bandgap emitted from the quantum dot particle may be selected by controlling the nanocrystal size and/or composition of the quantum dot particle. For example, as the size of the quantum dot particle decreases, it may have a wide energy bandgap and may decrease the emission wavelength. Accordingly, quantum dot particles emitting light of a desired wavelength may be implemented by adjusting the particle size and/or composition of the quantum dot particles.

For example, the quantum dot particles may include blue quantum dots emitting blue light, green quantum dots emitting green light, or red quantum dots emitting red light. For example, in the case of the green quantum dots or red quantum dots, blue light may be irradiated and converted into green or red light.

In addition, in the case of a general image display device including a color filter, a part of the light may be absorbed by the color filter in a process in which the irradiated white light passes through the color filter and implements color. Accordingly, light efficiency may decrease in the process of passing through the color filter.

In the case of including a color filter made of a quantum dot composition including quantum dot particles according to exemplary embodiments, since the color filter self-emites by light irradiated from a light source, more excellent light efficiency can be implemented.

According to example embodiments, the quantum dot particle may include a material that emits light when stimulated by light. For example, it may include a group II-VI compound, a group III-V compound, a group IV-VI compound, a group IV element or a compound containing the same, and mixtures thereof. These may be used alone or in combination of two or more.

The II-VI group compound is a binary element compound selected from CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof; ternary compounds selected from CdSeS, CdSeTe, CdSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, HgZnS, HgZnSe, HgZnTe, and mixtures thereof; and CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and quaternary compounds selected from mixtures thereof.

The group III-V compound is a binary element compound selected from GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; A ternary compound selected from GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, and mixtures thereof; and a quaternary compound selected from GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof.

The group IV-VI compound is a binary compound selected from SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof; ternary compounds selected from SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof; and a quaternary compound selected from SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof.

The group IV element or a compound containing the same is an elemental compound selected from Si, Ge, and mixtures thereof; and a binary element compound selected from SiC, SiGe, and mixtures thereof.

According to example embodiments, the quantum dot particle may have a homogeneous single structure, a core-shell structure, a gradient structure, or a mixed structure thereof.

In some embodiments, the quantum dot particle may have a core-shell structure composed of a core and a shell covering the core. The core may be a portion where light emission occurs substantially. The shell may serve to improve stability and efficiency of the quantum dot particle by preventing oxidation of the core and reducing a trap energy level on the surface.

Materials constituting each core and shell may be made of different compounds. For example, the core may be GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, InNP, InZnP, InNAs, InNSb, InPAs, InPSb GaInPAs, GaInPSb, InAlNP, InAlNAs, It may include one or more materials selected from the group consisting of InAlNSb, InAlPAs, InAlPSb, and mixtures thereof. The shell may include one or more materials selected from the group consisting of ZnSe, ZnS, ZnTe, CdTe, PbS, TiO, SrSe, HgSe, ZnSe, ZnS, ZnSeS, and mixtures thereof. Preferably, the core may include In and P, and the shell may include Zn, Se and/or S.

According to exemplary embodiments, the average particle diameter (D ₅₀ ) of the quantum dot particles may be about 5 nm to about 12 nm. For example, the average particle diameter (D ₅₀ ) may mean a particle diameter at a volume fraction of 50% in the cumulative particle diameter distribution.

In some embodiments, when the quantum dot particle has a core-shell structure, the average particle diameter of the core may be about 2 nm to 5 nm, and the thickness of the shell may be about 2 nm to 10 nm. When the average particle diameter and thickness are within the above ranges, the dispersibility of the quantum dot particles may be improved, and color implementation and luminous efficiency may be further improved. Thus, for example, the fairness of the quantum dot composition can be improved, and a desired color can be efficiently implemented by light irradiation.

In some embodiments, the shell may have a multi-layered shell structure including one or more shell layers. For example, the quantum dot particle may include a core, a first shell layer covering the core, and a second shell layer covering the first shell layer.

In some embodiments, adjacent core and shell layers in the multi-layer shell structure may have different compositions. For example, the core may include InP and/or InZnP, the first shell layer may include ZnSe and/or ZnSeS, and the second shell layer may include ZnS.

According to example embodiments, the quantum dot particle may include a concentration gradient region formed between a center and a surface of the particle. For example, the concentration of at least one of the specific elements of the quantum dot particle may change from the center of the particle to the surface of the particle.

In some embodiments, the concentration of Se may continuously decrease and the concentration of S may continuously increase from the center of the particle toward the surface of the particle. For example, the shell may have an intersection where concentrations of Se and S intersect. The intersection point may have the same concentrations of Se and S.

When Se is present on the surface of the quantum dot particle, Se may be oxidized due to exposure to external light and oxygen for a long time, and thus the structure of the quantum dot particle may be collapsed. As the concentration of Se decreases and the concentration of S increases toward the surface of the quantum dot particles according to exemplary embodiments, optical properties of the quantum dot particles may be improved, and durability and structural stability may be excellent.

In some embodiments, the quantum dot particle may be a non-cadmium-based quantum dot that does not substantially contain cadmium (Cd). Accordingly, it is possible to prevent environmental or human health problems caused by cadmium.

According to exemplary embodiments, the carboxylic acid compound may include a compound represented by Formula 1 below.

[Formula 1]

In Formula 1, R may be an aliphatic hydrocarbon group having 1 to 10 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms.

For example, R is an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an alkynyl group having 2 to 10 carbon atoms. It may be an arylalkyl group or an alkylaryl group having 6 to 12 carbon atoms.

Rf may be a fluoroalkylene group containing at least one fluorine atom and having 1 to 10 carbon atoms. In one embodiment, Rf may further contain at least one oxygen atom, and may include, for example, an ether group (-O-).

Ro may be an oxyalkylene group having 1 to 10 carbon atoms.

n may be an integer from 1 to 10.

In some embodiments, the carboxylic acid compound may be disposed on the surface of the quantum dot particle by a carboxyl group located at a molecular terminal. For example, a carboxyl group of a carboxylic acid compound may be chemically bonded to the surface of a quantum dot particle.

As the carboxy group has a strong affinity with the quantum dot particle, it can easily bind to the surface of the quantum dot particle. For example, the carboxyl group located at the terminal of the carboxylic acid compound may form a coordination bond with Zn included in the shell of the quantum dot particle. Accordingly, the carboxylic acid compound may stably passivate the quantum dot particles, and a coordination complex of the quantum dot particles and the carboxylic acid compound may be formed.

In general, ligands used in quantum dot compositions are composed of an aliphatic chain having a high carbon content, so that quantum dot particles may be substantially soluble only in non-polar solvents. Therefore, it has low dispersibility in a polar organic solvent or water mainly used in a display manufacturing process, and aggregation of quantum dot particles may occur. In this case, for example, processability and compatibility may be deteriorated in manufacturing a color filter, and sufficient light efficiency may not be provided.

According to exemplary embodiments, as the carboxylic acid compound includes an oxyalkylene group (Ro) and an ester group in a main chain, a coordinated complex of the quantum dot particle and the carboxylic acid compound may have polarity as a whole. Accordingly, the quantum dot particles may have excellent solubility and dispersibility even in polar solvents.

The term "main chain" used in this application refers to a portion consisting of the longest chain of atoms in the molecular structure of a carboxylic acid compound. For example, a side chain branched from the main skeleton of the carboxylic acid compound or a pendant group is excluded.

Preferably, in Chemical Formula 1, Ro may be an oxyethylene group. In this case, the polarity and oxygen/moisture barrier properties of the coordination complex can be appropriately controlled, and the dispersibility in polar solvents and antioxidant properties can be improved in a balanced manner.

For example, the carboxylic acid compound may include a compound represented by Formula 2 below.

[Formula 2]

In Formula 2, R may be an aliphatic hydrocarbon group having 1 to 10 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms.

Rf may be a fluoroalkylene group having 1 to 10 carbon atoms containing at least one fluorine atom, and may further include an ether group (-O-). n may be an integer from 1 to 10.

In Chemical Formulas 1 and 2, as the hydrophobic hydrocarbon group (R) is disposed at the end of the carboxylic acid compound, oxidation of the quantum dot particle by oxygen and/or moisture may be prevented. In addition, within the above carbon number range, barrier properties to oxidizing substances may be improved while dispersibility to polar solvents may be excellently maintained.

For example, when R is an aliphatic hydrocarbon group having more than 10 carbon atoms or an aromatic hydrocarbon group having more than 12 carbon atoms, as the hydrophobicity of the carboxylic acid compound increases excessively, dispersibility in polar solvents may decrease.

Preferably, R may be an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 12 carbon atoms.

In Chemical Formulas 1 and 2, Rf may be a fluorinated alkylene group having 1 to 10 carbon atoms in which at least one hydrogen atom is substituted with a fluorine atom. As the carboxylic acid compound contains a fluorine atom in its molecular structure, penetration of moisture and/or oxygen may be suppressed, and durability and stability of the quantum dot particles may be improved.

In one embodiment, the ratio of fluorine atoms in Rf, for example, the ratio of hydrogen atoms bonded to carbon atoms substituted with fluorine atoms may be 70% or more, preferably 90% or more.

In this case, as the number of hydrogen atoms substituted with fluorine atoms increases, oxidation of the quantum dot particles due to oxygen or moisture can be prevented. For example, oxygen or moisture permeability may be reduced due to a high content of fluorine atoms, and durability and structural stability of the quantum dot particles may be further improved by preventing an oxidizing material from contacting the quantum dot particles.

More preferably, Rf may be a fluoroalkylene group having 1 to 10 carbon atoms in which all hydrogen atoms are substituted with fluorine atoms. When Rf is a perfluoroalkylene group or a perfluoroether group, barrier properties against oxygen or moisture may be further enhanced, and deformation and structural collapse of quantum dot particles due to oxidation may be prevented. Accordingly, by preventing deterioration of the quantum dot particles, light conversion efficiency and emission wavelength range may be stably maintained, and light emission characteristics and lifespan of the cured pattern may be improved.

In addition, since the alkylene fluoride group exists adjacent to the carboxy group, an exchange reaction of the carboxylic acid compound can easily occur on the surface of the quantum dot particle. The carboxylic acid compound may stably passivate the quantum dot particles, and the coating coverage rate of the carboxylic acid compound on the quantum dot particles may increase.

In some embodiments, Rf may include at least one ether group. In this case, as the ether group is located adjacent to the fluorinated alkylene group in the main chain of the carboxylic acid compound, the dispersibility of the quantum dot particles in polar solvents can be improved, and the light conversion properties are excellent while preventing damage to the quantum dot particles. can keep

As described above, when the carboxylic acid compound includes the compound represented by Formula 1, solubility in polar organic solvents may be excellent, and oxidation/deterioration of the quantum dot particles may be prevented. Accordingly, reliability and durability under harsh conditions (eg, high temperature/high humidity) may be improved, and chemical resistance, moisture resistance, and optical properties of the cured pattern may be improved.

In some embodiments, the carboxylic acid compound may include at least one selected from the group consisting of compounds represented by Formulas 3 to 10 below.

[Formula 3]

[Formula 4]

[Formula 5]

[Formula 6]

[Formula 7]

[Formula 8]

[Formula 9]

[Formula 10]

As the carboxylic acid compound includes the compounds of Formulas 3 to 10, the solubility of the quantum dot particles in polar solvents can be improved by the terminal oxyalkylene group and the ester group, and the fluorinated alkylene group located adjacent to the carboxy group can reduce oxidizing substances. , for example, oxygen or moisture can be prevented from contacting the quantum dot particles.

Accordingly, dispersibility of the quantum dot particles in a polar solvent may be improved, and structural stability and luminous efficiency of the quantum dot particles may be excellent. Accordingly, degradation of light efficiency due to oxidation or damage of quantum dot particles can be prevented, and a color filter having excellent reliability and optical properties can be provided even under harsh conditions such as long-term storage or heat or exposure processes.

In some embodiments, the content of the carboxylic acid compound may be 30 parts by weight to 150 parts by weight based on 100 parts by weight of the quantum dot particles. When the content of the carboxylic acid compound is less than 30 parts by weight, dispersibility in polar solvents may not be sufficiently provided. When the content of the carboxylic acid compound is greater than 150 parts by weight, the curing degree and light conversion efficiency of the curing pattern may decrease as the carboxylic acid compound is excessively disposed on the surface of the quantum dot particle.

Preferably, the content of the carboxylic acid compound may be 50 parts by weight to 100 parts by weight based on 100 parts by weight of the quantum dot particles.

In some embodiments, the quantum dot particle is synthesized by a wet chemical process, metal organic chemical vapor deposition (MOCVD), or molecular beam epitaxy (MBE). can The wet chemical process is a method of growing particles by putting a precursor material in an organic solvent. When the crystal grows, the organic solvent is coordinated on the surface of the quantum dot crystal to act as a dispersant and control the growth of the crystal. Accordingly, crystal growth can be controlled through a process that is easier and cheaper than a vapor deposition method such as a metal organic chemical vapor deposition process or a molecular beam epitaxy process.

In some embodiments, the content of the quantum dot particles may be 1% to 50% by weight of the total weight of the solid content of the quantum dot composition. When the content of the quantum dot particles is less than 1% by weight, the luminous efficiency of the quantum dot particles may decrease. When the content of the quantum dot particles exceeds 50% by weight, it may be difficult to form a cured pattern due to a relatively insufficient content of other components.

Preferably, the content of the quantum dot particles may be 3% to 30% by weight of the total weight of the solid content of the quantum dot composition.

The quantum dot composition according to embodiments of the present invention may include the above-described quantum dot particles and the carboxylic acid compound, and may further include a binder resin, a solvent, a polymerizable compound, a polymerization initiator, or other additives.

binder resin

The binder resin may include a thermosetting resin or an alkali-soluble resin. The binder resin may be a component that imparts solubility to alkali development used in a developing process when forming a pattern.

In some embodiments, the binder resin may include an acrylic resin, a cardo resin, or an epoxy resin. These may be used alone or in combination of two or more. Preferably, it may be an acrylic resin and/or a cardo resin.

For example, acrylic resins include polybenzyl methacrylate, meth)acrylic acid/benzyl methacrylate copolymer, (meth)acrylic acid/benzyl methacrylate/styrene copolymer, (meth)acrylic acid/benzyl methacrylate/2- hydroxyethyl methacrylate copolymer, (meth)acrylic acid/benzyl methacrylate/styrene/2-hydroxyethyl methacrylate copolymer, and the like.

For example, the epoxy resin may include bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin, cyclic aliphatic epoxy resin, aliphatic polyglycidyl ether, and the like.

For example, cardo-based resins include fluorene-containing compounds such as 9,9-bis(4-oxiranylmethoxyphenyl)fluorene; Benzenetetracarboxylic dianhydride, naphthalenetetracarboxylic dianhydride, biphenyltetracarboxylic dianhydride, benzophenonetetracarboxylic dianhydride, pyromellitic dianhydride, cyclobutanetetracarboxylic dianhydride, anhydride compounds such as rylene tetracarboxylic di-anhydride, tetrahydrofurantetracarboxylic di-anhydride, and tetrahydrophthalic anhydride; Glycol compounds, such as ethylene glycol, propylene glycol, and polyethylene glycol; alcohol compounds such as methanol, ethanol, propanol, n-butanol, cyclohexanol, and benzyl alcohol; solvent compounds such as propylene glycol methylethyl acetate and N-methylpyrrolidone; phosphorus compounds such as triphenylphosphine; and amine or ammonium salt compounds such as tetramethylammonium chloride, tetraethylammonium bromide, benzyldiethylamine, triethylamine, tributylamine, and benzyltriethylammonium chloride.

The binder resin may have reactivity to light or heat and improve dispersibility of quantum dot particles. In addition, the binder resin may act as a binder resin for quantum dot particles and may be used as a support for curing patterns.

In some embodiments, the binder resin may be included in an amount of 5% to 80% by weight of the total solid weight of the quantum dot composition. Within the above range, solubility in a developing solution is sufficient, and thus pattern formation may be facilitated. In addition, film reduction in the pixel portion of the exposed portion is prevented during development, thereby reducing omission of the non-pixel portion. Preferably, it may be included in 10% to 70% by weight of the total weight of the solid content of the quantum dot composition.

menstruum

In some embodiments, the quantum dot composition may include a solvent. The solvent may include an organic solvent that sufficiently dissolves the above-described quantum dot particles, the carboxylic acid compound, and the binder resin and does not cause precipitation in the composition.

As described above, since the quantum dot particles have hydrophobicity, polar organic solvents such as propylene glycol monomethyl ether acetate and ethylene diglycol methyl ethyl ether are generally used in the manufacturing process of color filters or image display devices as solvents. Quantum dot particles may be precipitated when using the like.

According to exemplary embodiments, as a carboxylic acid compound having a polar functional group such as an oxyalkylene group or an ether group is coordinated to the surface of the quantum dot particle, a polar organic solvent can be used and light efficiency can be improved.

Examples of the solvent include ethylene glycol monoalkyl ethers; diethylene glycol dialkyl ethers; ethylene glycol alkyl ether acetates; alkylene glycol alkyl ether acetates; propylene glycol monoalkyl ethers; propylene glycol dialkyl ethers; propylene glycol alkyl ether propionates; butyl diol monoalkyl ethers; butanediol monoalkyl ether acetates; butanediol monoalkyl ether propionates; dipropylene glycol dimethyl ether, dipropylene glycol dialkyl ether; Aromatic hydrocarbons, such as benzene, toluene, xylene, and mesitylene; Ketones such as methyl ethyl ketone, cyclohexanone, 4-hydroxy-4-methyl-2-pentanone, methyl-n-propyl ketone, methyl-n-butyl ketone, methyl-n-amyl ketone, and 2-heptanone ; alcohols such as methanol and ethanol; esters such as 2-hydroxyethyl propionate, 2-hydroxy-2-methylethyl propionate, hydroxyethyl acetate, and methyl 2-hydroxy-3-methylbutanoate; cyclic ethers such as tetrahydrofuran and pyran; Cyclic esters, such as (gamma)-butyrolactone, etc. are mentioned. These may be used alone or in combination of two or more. Preferably, the solvent may include propylene glycol monomethyl ether (PGME) and/or propylene glycol monomethyl ether acetate (PGMEA).

The solvent may be included in a residual amount excluding other components of the composition, for example, the residual amount excluding the quantum dot particles and the carboxylic acid compound, or the residual amount excluding the quantum dot particles, the carboxylic acid compound, the binder resin, and other additive components. .

In some embodiments, the solvent may be included in an amount of 25% to 85% by weight, preferably 30% to 75% by weight, based on the total weight of the quantum dot composition. Within the above range, the coating and drying properties of the composition can be improved, and a coating can be easily formed through a coating method using a spin coater, slit and spin coater, slit coater, die coater, curtain flow coater, inkjet, or the like. .

polymeric compound

In some embodiments, the quantum dot composition may include a polymerizable compound. The polymerizable compound is a compound that can be polymerized or crosslinked by the action of a polymerization initiator described below, and can increase the crosslinking density during the manufacturing process and enhance the mechanical properties of the cured pattern.

The polymerizable compound may be used without particular limitation as long as it is used in the art, and may include, for example, a mono-functional monomer, a di-functional monomer, or a tri- or more functional multi-functional monomer. These may be used alone or in combination of two or more.

The monofunctional monomer may be nonylphenylcarbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexylcarbitol acrylate, 2-hydroxyethyl acrylate, N-vinylpyrrolidone, and the like. .

Bifunctional monomers include 1,6-hexanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, and bisphenol A bisphenol A. (acryloyloxyethyl) ether, 3-methylpentanediol di(meth)acrylate, and the like.

The multifunctional monomer is trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, Acrylates, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, ethoxylated dipentaerythritol hexa(meth)acrylate, propoxylated dipentaerythritol hexa(meth)acrylate ) acrylate, dipentaerythritol hexa (meth) acrylate, and the like.

In some embodiments, the content of the polymerizable compound may be 30% to 85% by weight, preferably 40% to 80% by weight, based on the total weight of the solid content of the quantum dot composition. When the polymerizable compound is included in the above content range, durability of the photocurable film may be improved, and resolution of the composition may be improved during a developing process.

polymerization initiator

In some embodiments, the quantum dot composition may include a polymerization initiator.

A polymerization initiator may be used without particular limitation as long as it can induce a crosslinking reaction or a polymerization reaction of the polymerizable compound by, for example, an exposure process. For example, the polymerization initiator may be an acetophenone-based compound, a benzophenone-based compound, a benzoin-based compound, a triazine-based compound, a biimidazole-based compound, a thioxanthone-based compound, an oxime ester-based compound, and the like, preferably An oxime ester-based compound may be used.

The oxime ester compound is o-ethoxycarbonyl-α-oxyimino-1-phenylpropan-1-one, 1,2-octadione-1-(4-phenylthio)phenyl-2-(o-benzoyl oxime), ethanone, -1-(9-ethyl)-6-(2-methylbenzoyl-3-yl)-,1-(o-acetyloxime), etc. Ciba Geigy Co.), CGI-224 (Ciba Gei Co.), Irgacure OXE-01 (BASF Co.), Irgacure OXE-02 (BASF Co.), N-1919 (Adecas Co.), NCI-831 (Adecas Co.), etc. can These may be used alone or in combination of two or more.

In some embodiments, a polymerization initiation aid may be additionally used to enhance the sensitivity of the quantum dot composition. Examples of the polymerization initiation aid include an amine compound, an organic sulfur compound having a carboxyl group or a thiol group, and the like.

In some embodiments, the polymerization initiator may be included in an amount of 0.1% to 10% by weight, preferably 0.1% to 5% by weight, based on the total weight of the solid content of the quantum dot composition. Within the above range, the efficiency and resolution of the exposure process may be improved without impairing the durability of the quantum dot composition.

Other Additives

The quantum dot composition according to exemplary embodiments may further include additives such as a filler, another polymer compound, a curing agent, a leveling agent, an adhesion promoter, an antioxidant, an ultraviolet absorber, an aggregation inhibitor, and a chain transfer agent, if necessary.

In addition, the quantum dot composition according to exemplary embodiments may further include other organic or inorganic ligands within a range that does not impair the characteristics of the above-described carboxylic acid compound. The organic or inorganic ligand may form a coordination bond on the surface of the quantum dot particle and improve the dispersibility and emission characteristics of the quantum dot particle.

For example, the organic ligand is trioctylphosphine, trioctylphosphine oxide, oleic acid, oleylamine, octylamine, trioctylamine, hexadecylamine, octanethiol, dodecanethiol, hexylphosphonic acid, tetradecylphos phonic acid, octylphosphinic acid, and the like. The inorganic ligand may include inorganic materials such as halogen, metal halide, chalcogen, metal chalcogenide, metal hydroxide, and SCN-. These may be used alone or in combination of two or more.

<Curing pattern and display device>

The present invention provides a curing pattern prepared from a quantum dot composition according to exemplary embodiments and a display device including the curing pattern. For example, the curing pattern may be used as a color filter of a display device as will be described later.

In forming the curing pattern, a photoresist film may be formed by coating the quantum dot composition according to exemplary embodiments on a substrate. Examples of the coating method include inkjet printing, spin coating, casting coating, roll coating, slit and spin coating, and slit coating. After forming the photoresist film, a pre-baking process may be performed to remove volatile components such as a solvent.

Thereafter, an exposure process may be performed to form a photocurable film. In order to form a target pattern, ultraviolet rays may be irradiated through an exposure mask of a predetermined shape. For example, curing may be performed on the portion irradiated with the ultraviolet rays. As the ultraviolet rays, g-rays (wavelength: 436 nm), h-rays (wavelength: 405 nm), i-rays (wavelength: 365 nm), and the like may be used.

After the exposure process, a developing process may be performed to form a cured pattern. For example, a cured pattern may be formed by removing an unexposed portion using an alkaline developer. Alternatively, a cured pattern may be formed by removing the exposed portion using an alkaline developer. The developing process may include a liquid addition method, a dipping method, a spray method, and the like. A post baking process may be further performed after the exposure process or the development process.

According to example embodiments, the curing pattern may be used for a color filter. The color filter including the curing pattern may be applied to various image display devices such as an electroluminescence display, a plasma display, and a field emission display as well as a general liquid crystal display.

The color filter may include a substrate and a hardened pattern layer formed on the substrate. For example, the substrate may be a substrate of a color filter itself, or may be a portion where a color filter is positioned in a display device or the like. The substrate may be glass, silicon, silicon oxide, or a polymer substrate, and the polymer substrate may be polyethersulfone (PES) or polycarbonate (PC).

When the color filter is applied to a display device, since quantum dot particles included in the color filter emit light themselves by light from a light source, light efficiency may be excellent. In addition, color reproducibility may be excellent as light having a color is emitted, and a viewing angle may be improved because light is emitted in all directions by quantum dot particles.

In some embodiments, the color filter may include a transparent pattern layer, a green pattern layer that converts incident blue light into green light, or a red pattern layer that converts incident blue light into red light. The green pattern layer may include green quantum dots that emit green light when irradiated with blue light, and the red pattern layer may include red quantum dots that emit red light when irradiated with blue light.

In some embodiments, the display device may include a color filter including a transparent pattern layer, a green pattern layer, and a red pattern layer. In this case, a light source emitting blue light may be used as a light source of the display device.

As described above, since the quantum dot composition according to exemplary embodiments includes the carboxylic acid compound represented by Chemical Formula 1, it may have excellent dispersibility and durability in polar solvents. Therefore, a cured pattern having excellent reliability, stability and optical properties can be provided from the quantum dot composition described above.

Accordingly, since loss of light passing through the color filter can be minimized and irradiated light can be efficiently converted into light in a target wavelength range, a display device having excellent light emitting characteristics and efficiency can be implemented.

Hereinafter, experimental examples including specific examples and comparative examples are presented to aid understanding of the present invention, but these are only illustrative of the present invention and do not limit the scope of the appended claims, and the scope and technical spirit of the present invention It is obvious to those skilled in the art that various changes and modifications to the embodiments are possible within the scope, and it is natural that these changes and modifications fall within the scope of the appended claims.

Synthesis Example: Surface Modified Quantum Dot Particles

Synthesis Example 1: A-1

A solution in which InP/ZnSe/ZnS core-shell quantum dot particles are dispersed (quantum dot solid content: 30%) is centrifuged twice using acetone and ethanol, followed by vacuum drying to obtain quantum dot particle powder. Thereafter, 30 g of the quantum dot particles were completely dissolved using 100 g of toluene, and 30 g of a compound represented by Formula 3 was added thereto. Thereafter, the reaction was performed for 15 hours while maintaining 50° C. under a nitrogen atmosphere to prepare quantum dot particles surface-modified with a carboxylic acid compound.

[Formula 3]

Synthesis Example 2: A-2

Quantum dot particles surface-modified with a carboxylic acid compound were prepared in the same manner as in Synthesis Example 1, except that the compound represented by Formula 4 was used instead of the compound represented by Formula 3.

[Formula 4]

Synthesis Example 3: A-3

Quantum dot particles surface-modified with a carboxylic acid compound were prepared in the same manner as in Synthesis Example 1, except that the compound represented by Formula 5 was used instead of the compound represented by Formula 3.

[Formula 5]

Synthesis Example 4: A-4

Quantum dot particles surface-modified with a carboxylic acid compound were prepared in the same manner as in Synthesis Example 1, except that the compound represented by Formula 6 was used instead of the compound represented by Formula 3.

[Formula 6]

Synthesis Example 5: A-5

Quantum dot particles surface-modified with a carboxylic acid compound were prepared in the same manner as in Synthesis Example 1, except that the compound represented by Formula 7 was used instead of the compound represented by Formula 3.

[Formula 7]

Synthesis Example 6: A-6

Quantum dot particles surface-modified with a carboxylic acid compound were prepared in the same manner as in Synthesis Example 1, except that the compound represented by Formula 8 was used instead of the compound represented by Formula 3.

[Formula 8]

Synthesis Example 7: A-7

Quantum dot particles surface-modified with a carboxylic acid compound were prepared in the same manner as in Synthesis Example 1, except that the compound represented by Formula 9 was used instead of the compound represented by Formula 3.

[Formula 9]

Synthesis Example 8: A-8

Quantum dot particles surface-modified with a carboxylic acid compound were prepared in the same manner as in Synthesis Example 1, except that the compound represented by Formula 10 was used instead of the compound represented by Formula 3.

[Formula 10]

Synthesis Example 9: A-9

Quantum dot particles surface-modified with a carboxylic acid compound were prepared in the same manner as in Synthesis Example 1, except that the compound represented by Formula 11 was used instead of the compound represented by Formula 3.

[Formula 11]

Synthesis Example 10: A-10

Quantum dot particles surface-modified with a carboxylic acid compound were prepared in the same manner as in Synthesis Example 1, except that the compound represented by Formula 12 was used instead of the compound represented by Formula 3.

[Formula 12]

Synthesis Example 11: A-11

Quantum dot particles surface-modified with a carboxylic acid compound were prepared in the same manner as in Synthesis Example 1, except that the compound represented by Formula 13 was used instead of the compound represented by Formula 3.

[Formula 13]

Examples and Comparative Examples

(1) Preparation of quantum dot composition

A quantum dot composition was prepared by mixing the surface-modified quantum dot particles and the components listed in Table 1 below in corresponding amounts (wt%).

division
(weight%) quantum dot particles binder resin polymeric compound polymerization initiator menstruum Example 1 15(A-1) 50 1.6 0.1 33.3 Example 2 15(A-2) 50 1.6 0.1 33.3 Example 3 15(A-3) 50 1.6 0.1 33.3 Example 4 15(A-4) 50 1.6 0.1 33.3 Example 5 15(A-5) 50 1.6 0.1 33.3 Example 6 15(A-6) 50 1.6 0.1 33.3 Example 7 15(A-7) 50 1.6 0.1 33.3 Example 8 15(A-8) 50 1.6 0.1 33.3 Comparative Example 1 15(A-9) 50 1.6 0.1 33.3 Comparative Example 2 15 (A-10) 50 1.6 0.1 33.3 Comparative Example 3 15(A-11) 50 1.6 0.1 33.3

The specific component names described in Table 1 are as follows.

Quantum dot particle (A)

1) A-1: Quantum dot particles prepared in Synthesis Example 1

2) A-2: Quantum dot particles prepared in Synthesis Example 2

3) A-3: Quantum dot particles prepared in Synthesis Example 3

4) A-4: Quantum dot particles prepared in Synthesis Example 4

5) A-5: Quantum dot particles prepared in Synthesis Example 5

6) A-6: Quantum dot particles prepared in Synthesis Example 6

7) A-7: Quantum dot particles prepared in Synthesis Example 7

8) A-8: Quantum dot particles prepared in Synthesis Example 8

9) A-9: Quantum dot particles prepared in Synthesis Example 9

10) A-10: Quantum dot particles prepared in Synthesis Example 10

11) A-11: Quantum dot particles prepared in Synthesis Example 11

Binder Resin (B)

Acrylic "binder" resin (SPCY-1L, manufactured by Showa Polymer Co., Ltd.)

Polymerizable compound (C)

Dipentaerythritol hexaacrylate (KAYARAD DPHA, manufactured by Nippon Kayaku Co., Ltd.)

Polymerization initiator (D)

Irgaqure-907 (manufactured by BASF)

Solvent (E)

Propylene glycol monomethyl ether acetate (PGMEA)

(2) Manufacture of color filter

After applying the quantum dot composition according to Examples and Comparative Examples on a glass substrate by spin coating, it was placed on a heating plate and maintained at a temperature of 100° C. for 3 minutes to form a thin film. A test photomask having a square transmission pattern of 20 mm X 20 mm and a line/space pattern of 1 to 100 μm was placed on the thin film, and ultraviolet rays were irradiated at a distance of 100 μm from the test photomask. Ultra-high pressure mercury lamp (USH-250D, manufactured by Ushio Denki Co., Ltd.) was used as an ultraviolet light source, and light was irradiated with an exposure amount of 200 mJ/cm ² (wavelength: 365 nm) in an air atmosphere. Thereafter, the thin film was developed by immersing it in a KOH aqueous solution of pH 10.5 for 80 seconds.

Thereafter, it was washed with distilled water, dried by blowing nitrogen gas, and heated in an oven at 150° C. for 10 minutes to prepare a color filter. The pattern thickness of the prepared color filter was 3.0 μm.

Experimental example

(1) Evaluation of dispersibility of quantum dot particles

The quantum dot particles prepared in Synthesis Example 1 to Synthesis Example 11 were dispersed in a PGMEA (Propylene Glycol Mono Methyl Ether Acetate) solvent to finally prepare a quantum dot dispersion solution containing 50% by weight of solid content. Thereafter, the particle size of the prepared quantum dot dispersion solution was measured using a particle size analyzer. The lower the dispersibility, the larger the particle size of the quantum dots may be due to aggregation. The evaluation results are shown in Table 2 below.

division Synthesis Example 1 Synthesis Example 2 Synthesis Example 3 Synthesis Example 4 Synthesis Example 5 Synthesis Example 6 Particle size (nm) 42 33 54 24 31 26 division Synthesis Example 7 Synthesis Example 8 Synthesis Example 9 Synthesis Example 10 Synthesis Example 11 Particle size (nm) 35 21 1900 20 18

Referring to Table 2, in the case of Synthesis Examples 1 to 8 surface-modified with a carboxylic acid compound according to exemplary embodiments, it can be seen that the particle size of the quantum dot particles in the dispersion solution is small. Accordingly, it can be predicted that the aggregation of the quantum dot particles is suppressed in the polar solvent and the dispersibility is excellent.

On the other hand, in the case of Synthesis Example 9 in which the surface was modified with a carboxylic acid compound not containing an ether group, it was confirmed that the particle size was very high due to excessive aggregation between quantum dot particles. In the case of a carboxylic acid compound having a general alkyl chain structure, it can be confirmed that the dispersibility is very poor in a polar organic solvent such as PGMEA.

(2) Evaluation of storage stability

The quantum dot compositions according to Examples and Comparative Examples were allowed to stand at room temperature, and the viscosity over time was measured using a viscometer (manufactured by Brookfield). There is little change in viscosity over time, and the lower the viscosity, the better the storage stability. The evaluation results are shown in Table 3 below.

(3) Light efficiency and durability evaluation

Light efficiency was calculated by irradiating blue light to the prepared color filter and measuring the degree of conversion into green light. The light efficiency was measured using QE-2000 (manufactured by Otsuka Co.), and as 450 nm blue light was applied to the color filter, all green light emitted in all directions was absorbed and calculated as an integral value. Light efficiency was calculated by using the percentage of the increase in the peak converted to green light compared to the decrease in the blue light absorption peak.

In addition, after the color filter was left in a blue light source at room temperature for 7 days, light efficiency was measured to calculate the amount of reduction. Since light efficiency decreases due to oxidation of quantum dot particles, light durability can be confirmed by measuring light efficiency after being left. Light durability was expressed as a percentage of the ratio of the light efficiency after leaving to the initial light efficiency. It means that oxidation stability is excellent, so that durability is high.

The evaluation results are shown together in Table 3 below.

division storage stability
(viscosity, cP) light efficiency
(%) durability
(%) Early 2 weeks 4 weeks Early after neglect Example 1 10.8 11.6 12.4 77 67.5 87.7 Example 2 10.5 11.5 12.2 79 68.0 86.1 Example 3 11.0 11.4 12.0 77 68.0 88.3 Example 4 10.3 11.3 11.9 80 71.8 89.8 Example 5 10.7 11.1 11.5 84 76.9 91.5 Example 6 10.5 11.0 11.7 83 74.8 90.1 Example 7 11.0 11.2 11.4 86 79.7 92.7 Example 8 10.2 10.9 12.1 85 76.4 89.9 Comparative Example 1 12.2 13.6 15.2 70 46.4 66.3 Comparative Example 2 11.0 13.3 15.9 69 44.3 64.2 Comparative Example 3 10.5 14.1 16.3 73 46.0 63.0

Referring to Table 3, in the case of the color filter prepared using the quantum dot composition according to the exemplary embodiments, it can be seen that the change in viscosity over time is small, and both the initial light efficiency and the light efficiency after being left are excellent. Therefore, it can be confirmed that the quantum dot composition has excellent light durability by preventing oxidation of the quantum dot particles by the carboxylic acid compound containing an alkylene fluoride group.

On the other hand, in the case of the color filter prepared using the quantum dot composition according to the Comparative Examples, the viscosity increased remarkably as the penetration of oxygen or moisture was not prevented. In addition, it can be seen that the initial light conversion rate was low according to the oxidation of the quantum dot particles, and the light conversion rate significantly decreased over time.

Claims (16)

quantum dot particles; and
A quantum dot composition comprising a carboxylic acid compound represented by Formula 1 below:
[Formula 1]

(In Formula 1, R is an aliphatic hydrocarbon group having 1 to 10 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms,
Rf is a fluorinated alkylene group of 1 to 10 carbon atoms or a fluorinated alkylene group of 1 to 10 carbon atoms containing at least one ether group (-O-),
Ro is an oxyalkylene group having 1 to 10 carbon atoms;
n is an integer from 1 to 10).
The quantum dot composition of claim 1, wherein the carboxylic acid compound comprises a compound represented by Formula 2 below:
[Formula 2]

(In Formula 2, R is an aliphatic hydrocarbon group having 1 to 10 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms,
Rf is a fluorinated alkylene group having 1 to 10 carbon atoms or a fluorinated alkylene group having 1 to 10 carbon atoms containing at least one ether group (-O-);
n is an integer from 1 to 10).
The quantum dot composition of claim 1, wherein Rf in Formula 1 is a fluorinated alkylene group having 1 to 10 carbon atoms in which all hydrogen atoms are substituted with fluorine atoms.
The quantum dot composition of claim 1, wherein the carboxylic acid compound includes at least one of compounds represented by Formulas 3 to 10:
[Formula 3]

[Formula 4]

[Formula 5]

[Formula 6]

[Formula 7]

[Formula 8]

[Formula 9]

[Formula 10]
.
The quantum dot composition of claim 1, wherein the carboxylic acid compound is coordinately bonded to the surface of the quantum dot particle.
The quantum dot composition of claim 1, wherein the quantum dot particle includes at least one selected from the group consisting of a group II-VI compound, a group III-V compound, a group IV-VI compound, and a group IV element or a compound containing the same. .
The method according to claim 1, wherein the average particle diameter (D ₅₀ ) of the quantum dot particles is 5nm to 12nm, the quantum dot composition.
The quantum dot composition of claim 1 , wherein the quantum dot particles include a core and a shell covering the core.
The quantum dot composition of claim 8 , wherein the core has an average particle diameter of 2 nm to 5 nm, and the shell has a thickness of 2 nm to 10 nm.
The quantum dot composition of claim 8 , wherein the core includes indium (In) or phosphorus (P), and the shell includes zinc (Zn), selenium (Se), or sulfur (S).
The method according to claim 8, wherein the shell includes a first shell layer covering the core and a second shell layer covering the first shell layer,
Wherein the core comprises InP or InZnP, the first shell layer comprises ZnSe or ZnSeS, and the second shell layer comprises ZnS.
The quantum dot composition of claim 1, wherein the content of the carboxylic acid compound is 30 parts by weight to 150 parts by weight based on 100 parts by weight of the quantum dot particles.
The method according to claim 1, The content of the quantum dot particles is 1% to 50% by weight of the total weight of the solid content of the quantum dot composition, the quantum dot composition.
The quantum dot composition of claim 1 , further comprising at least one of a binder resin, a polymerizable compound, a polymerization initiator, and a solvent.
A cured pattern formed from the quantum dot composition according to claim 1 .
A display device comprising the curing pattern according to claim 15 .