KR102041810B1

KR102041810B1 - Wavelength-conversion particle complex and composition comprising it

Info

Publication number: KR102041810B1
Application number: KR1020160014228A
Authority: KR
Inventors: 권태균; 유수영; 이영신; 박문수; 이성민
Original assignee: 주식회사 엘지화학
Priority date: 2016-02-04
Filing date: 2016-02-04
Publication date: 2019-11-07
Also published as: KR20170092936A

Abstract

The present application relates to wavelength conversion particle composites, compositions for optical films and optical films, lighting devices and display devices.
The present application relates to a wavelength converting particle composite and an optical film composition including the same, which can increase wavelength conversion efficiency by maximizing scattering effects and the like while minimizing decrease in wavelength conversion efficiency due to external factors.

Description

Wavelength converting particle composite and composition for optical film comprising same {WAVELENGTH-CONVERSION PARTICLE COMPLEX AND COMPOSITION COMPRISING IT}

The present application relates to a wavelength conversion particle composite, a composition for an optical film comprising the same, an optical film and a use thereof.

Lighting devices are used for a variety of applications. The lighting device is, for example, a BLU of a display such as a liquid crystal display (LCD), a TV, a computer, a mobile phone, a smartphone, a personal digital assistant (PDA), a gaming device, an electronic reading device or a digital camera. Can be used as (Backlight Unit). In addition, the lighting device may be used for indoor or outdoor lighting, stage lighting, decorative lighting, accent lighting or museum lighting, and the like, and may also be used for special wavelength lighting required in horticulture or biology.

As a typical lighting device, for example, a device that emits white light by combining a blue LED (Light Emitting Diode) and a phosphor such as YAG (Yttrium aluminum garnet), which is used as a BLU of an LCD.

In recent years, researches on lighting devices that emit white light using wavelength-converting particles, such as quantum dots, which vary in color of light emitted according to particle size, have been steadily being conducted.

In particular, researches for increasing the luminous efficiency of the quantum dots themselves have been actively conducted.

Korean Laid-Open Patent Publication No. 2011-0048397 Korean Laid-Open Patent Publication No. 2011-0038191

The present application by simultaneously combining the scattering agent and stabilizer on the surface of the wavelength conversion particle, the optical film that can maximize the wavelength conversion efficiency increase according to the scattering effect and prevent the reduction of luminous efficiency due to external factors such as oxygen and moisture It provides a wavelength conversion particle composite and an optical film composition comprising the same.

The present application also provides an optical film having excellent optical properties such as luminous efficiency and the use thereof.

The present application has been made to solve the above problems, wavelength conversion particles; And a stabilizer and a scattering agent bonded to the surface of the wavelength conversion particle.

In one example, the stabilizer is a thiol-based ligand, the scattering agent is a salt salt, specifically zinc acetate (zinc acetate), zinc stearate (zinc stearate), zinc sulfate (zinc sulfate), zinc chloride (zinc chloride) , Zinc fluoride, zinc iodide, zinc bromide, zinc chlorate and zinc nitrate may be any one selected from the group consisting of: zinc fluoride, zinc iodide, zinc bromide, zinc chlorate and zinc nitrate have.

The present application also includes a polymer resin or a radical polymerizable compound; Wavelength converting particles; Scattering agent; And it is about the composition for optical films containing a stabilizer. The scattering agent and the stabilizer may be bonded to the surface of the wavelength conversion particle to form a wavelength conversion particle composite.

The present application also includes a wavelength conversion particle; And a wavelength conversion layer having a wavelength conversion particle composite including a stabilizer and a scattering agent bound to a surface of the wavelength conversion particle.

The present application also relates to a lighting device and a display device including the optical film.

The present application is to maximize the wavelength conversion efficiency increase according to the scattering effect and to prevent the wavelength conversion particle composite for optical film and the optical film composition comprising the same that can prevent the emission efficiency due to external factors such as oxygen and moisture to provide.

The present application also provides an optical film having excellent optical properties such as luminous efficiency and uses thereof, for example, lighting devices or display devices.

1 is a schematic diagram of an exemplary optical film.
2 and 3 are schematic diagrams of exemplary lighting devices.
4 shows a photograph of the wavelength conversion layer according to the second embodiment.
5 to 7 show the results of evaluating the luminous efficiency of the optical film according to the Examples and Comparative Examples.

Hereinafter, the present application will be described in more detail with reference to Examples and drawings, but is only an embodiment limited to the gist of the present application. On the other hand, the present application is not limited to the process conditions presented in the following examples, it is apparent to those skilled in the art that can be arbitrarily selected within the range of conditions necessary to achieve the purpose of the present application. .

The present application relates to a wavelength conversion particle composite and an optical film composition comprising the same.

The wavelength conversion particle composite of the present application is a wavelength conversion particle; And a stabilizer and a scattering agent bound to the surface of the wavelength conversion particle.

The wavelength conversion particle composite of this application can simultaneously improve a wavelength conversion efficiency by including a stabilizer and a scattering agent on the surface, and can improve the durability of a wavelength conversion particle.

The wavelength conversion particle composite of the present application includes wavelength conversion particles.

The term "wavelength converting particle" in the present application means a nanoparticle formed to absorb light of any wavelength and emit light of the same or different wavelengths.

In the present application, the term "nanoparticle" is a particle having a nano-level dimension, for example, an average particle diameter of about 100 nm or less, 90 nm or less, 80 nm or less, 70 nm or less, 60 nm or less, It may mean particles that are 50 nm or less, 40 nm or less, 30 nm or less, 20 nm or less, or about 15 nm or less. The shape of the nanoparticles is not particularly limited, and may be spherical, ellipsoidal, polygonal or amorphous.

The wavelength conversion particle may be a particle capable of absorbing light of a predetermined wavelength and emitting light of the same or different wavelength.

In one example, the wavelength converting particles are first wavelength converting particles (hereinafter referred to as green particles) that absorb light of any wavelength within the range of 420 to 490 nm and emit light of any wavelength within the range of 490 to 580 nm. Or a second wavelength converting particle (hereinafter referred to as a red particle) that absorbs light of any wavelength within the range of 420 to 490 nm and emits light of any wavelength within the range of 580 to 780 nm. Can be.)

For example, the red particles and / or the green particles may be included in the composition together in an appropriate ratio to obtain an optical film having a wavelength conversion layer capable of emitting white light.

As the wavelength converting particle, any one that exhibits such a function can be used without particular limitation. Representative examples of such particles include, but are not limited to, a nanostructure called a quantum dot.

In the present application, for convenience, referred to as wavelength converting particles, the wavelength converting particles may be in the form of particles, for example, nanowires, nanorods, nanotubes, branched nanostructures, nanonotetrapods, and tripods. ) Or bipods, and the like, which may also be included in the wavelength conversion particles defined in the present application.

As used herein, the term "nanostructure" includes at least one area or characteristic dimension having a dimension of less than about 500 nm, less than about 200 nm, less than about 100 nm, less than about 50 nm, less than about 20 nm, or less than about 10 nm. Branches may include similar structures. In general, area or characteristic dimensions may exist along the smallest axis of the structure, but are not limited thereto. The nanostructures can be, for example, substantially crystalline, substantially monocrystalline, polycrystalline or amorphous, or combinations of the above.

Quantum dots or other nanoparticles that may be used in the present application may be formed using any suitable material, for example, an inorganic conductive or semiconducting material, as an inorganic material. Suitable semiconductor materials can be exemplified by Group II-VI, III-V, IV-VI, I-III-VI and Group IV semiconductors. Specifically, Si, Ge, Sn, Se, Te, B, C (including diamond), P, BN, BP, BAs, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs, InSb, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, CdSeZn, CdTe, HgS, HgSe, HgTe, BeS, BeSe, BeTe, MgS MgSe, GeS, GeSe, GeTe, SnS, SnSe, SnTe, PbO, PbS, PbSe, PbTe, CuF, CuCl, CuBr, CuI, Si ₃ N ₄ , Ge ₃ N ₄ , Al ₂ O ₃ , (Al, Ga, In) ₂ (S, Se, Te) ₃ , Al ₂ CO, CuInS ₂ , CuInSe ₂ , CuInS _x Se ₂ _-x and suitable combinations of two or more of the above semiconductors may be illustrated, but are not limited thereto.

In one example, the semiconductor nanocrystal or other nanostructure may include a dopant, such as a p-type dopant or an n-type dopant. Nanoparticles that may be used in the present application may also include II-VI or III-V semiconductors. Examples of II-VI or III-V semiconductor nanocrystals and nanostructures include any combination of periodic table group elements, such as Zn, Cd, and Hg, with periodic table group VI elements, such as S, Se, Te, Po, and the like; And any combination of group III elements, such as B, Al, Ga, In, and Tl, and group V elements, such as N, P, As, Sb, Bi, and the like, but is not limited thereto. In other examples suitable inorganic nanostructures include metal nanostructures, and suitable metals include Ru, Pd, Pt, Ni, W, Ta, Co, Mo, Ir, Re, Rh, Hf, Nb, Au, Ag, Ti , Sn, Zn, Fe or FePt and the like can be exemplified, but is not limited thereto.

Wavelength converting particles, eg, quantum dots, may have a core-shell structure. Exemplary materials capable of forming core-cell structured wavelength converting particles include Si, Ge, Sn, Se, Te, B, C (including diamond), P, Co, Au, BN, BP, BAs, AlN, AlP , AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs, InSb, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, CdSeZn , CdTe, HgS, HgSe, HgTe, BeS, BeSe, BeTe, MgS, MgSe, GeS, GeSe, GeTe, SnS, SnSe, SnTe, PbO, PbS, PbSe, PbTe, CuF, CuCl, CuBr, CuI, Si ₃ N ₄ , Ge ₃ N ₄ , Al ₂ O ₃ , (Al, Ga, In) ₂ (S, Se, Te) ₃ , Al ₂ CO and any combination of two or more such materials, including but not limited to no.

Exemplary core-cell wavelength converting particles (core / cell) applicable in this application include, but are not limited to, CdSe / ZnS, InP / ZnS, PbSe / PbS, CdSe / CdS, CdTe / CdS or CdTe / ZnS, etc. It is not.

Such wavelength conversion particles may be one whose surface is modified by a ligand, a barrier, or the like.

In one example, the wavelength converting particles may be surface modified with ligands in the form of XYZ, where X is a site that can be directly bonded to the wavelength converting particles, and Y is hydrophilic or hydrophobic to ensure dissolution properties with the surrounding medium. It is a prominent site, Z may have a structure capable of binding to a specific site of the stabilizer or scattering agent to bind to a stabilizer or a scattering agent, or may have a structure that can be substituted with a stabilizer or scattering agent.

In addition, when the wavelength conversion particle has a core / shell structure, the shell portion may be formed to be capable of bonding with a scattering agent and a stabilizer. That is, when the wavelength conversion particle has a core / shell structure, the shell portion may have a ligand that can be substituted with a stabilizer, or a ligand that can bind to the stabilizer.

In addition, the wavelength conversion particle may be a polymer particle made of an organic material.

The type and size of the polymer particles made of the organic material may be used without limitation, for example, those of which the Republic of Korea Patent Publication No. 2014-0137676 is disclosed.

The wavelength converting particles can be prepared in any known manner. For example, U.S. Patent 6,225,198, U.S. Patent Publication 2002-0066401, U.S. Patent 6,207,229, U.S. Patent 6,322,901, U.S. Patent 6,949,206, U.S. Patent 7,572,393, U.S. Patent 7,767,865, U.S.A. A method of forming a quantum dot or the like is known from Patent No. 7,374,807 or US Pat. No. 6,861,155, and various other known methods may be applied to the present application.

The specific kind of the wavelength conversion particle is not particularly limited and may be appropriately selected in consideration of desired light emission characteristics.

The wavelength converting particle has a stabilizer and a scattering agent bonded to a surface thereof.

The stabilizer bound to the surface of the wavelength conversion particle may be, for example, a thiol ligand.

The thiol-based ligand bound to the surface of the wavelength conversion particle may improve the wavelength conversion efficiency by removing an electron-hole trap on the surface of the wavelength conversion particle.

The thiol ligand may be, for example, but not limited to, an alkane thiol or an aryl thiol, and a known thiol ligand capable of achieving the above object may be included without limitation.

In a specific example, butane thiol, butane thiol, hexane thiol or dodecane thiol may be exemplified, but is not limited thereto.

In a specific example, the aryl thiol may be thio phenol, 1,3-benzothiazole-2-thiol, purine-6-thiol, pyridine-2-thiol, or pyrimidine-2-thiol and the like, but is not limited thereto. It doesn't happen.

The thiol-based ligand is bonded to the surface of the wavelength conversion particle, for example, by coupling a linker (Linker) that can connect the wavelength conversion particle and the thiol-based ligand to the surface of the wavelength conversion particle, the linker (Linker) It is possible to bind the wavelength conversion particle and the thiol-based ligand through. The linker and the thiol-based ligand and the binding may be, for example, by hydrogen bonding or hydrophobic interaction, but are not limited thereto and may include all of the binding by various known chemical or physical factors.

In another example, the method of binding the thiol-based ligand to the surface of the wavelength conversion particle may be a method of combining the thiol-based ligand and a substitutable ligand to the wavelength conversion particle, and then replacing the ligand with a thiol-based ligand. It is not limited.

The wavelength converting particle composite also includes a scattering agent bonded to the surface of the wavelength converting particle.

As such, when the scattering agent is combined with the wavelength converting particles, the scattering effect by the scattering agent, specifically, the number of times the light scattered by the scattering agent contacts the wavelength converting particles, can be increased, and the holes of the wavelength converting particles can be increased. Electron-hole traps can be eliminated to increase wavelength conversion efficiency.

In one example, the scattering agent may have an absolute value of the refractive index difference with the surrounding medium, such as a hydrophilic region or a hydrophobic region formed by the polymerization of the composition for an optical film described below, 0.2 or more or 0.4. The upper limit of the absolute value of the difference in refractive index is not particularly limited and may be, for example, about 0.8 or less or about 0.7 or less. Due to this difference in refractive index, it is possible to increase the scattering effect and the wavelength conversion efficiency induced thereby.

The scattering agent bound to the wavelength conversion particle has the above-described physical properties, and may be, for example, a salt salt.

In a specific example, the salt salt is zinc acetate, zinc stearate, zinc sulfate, zinc chloride, zinc fluoride, zinc iodide iodide, zinc bromide, zinc chlorate and zinc nitrate may be any one selected from the group consisting of, but are not limited thereto.

The present application also relates to a composition for an optical film including the wavelength conversion particle composite.

The term "optical film" in the present application may mean a film used in an optical device for various uses. For example, the optical film may mean a film formed to absorb light having a predetermined wavelength and emit light having the same or different wavelength as the absorbed light.

Since the composition for an optical film of the present application includes a wavelength converting particle, a scattering agent, and a stabilizer at the same time, and the scattering agent and the stabilizer are included in the composition in a state of being bonded to the surface of the wavelength converting particle to form a composite, durability and An optical film having excellent wavelength conversion efficiency can be provided.

The optical film composition may include a polymer resin or a first radical polymerizable compound; Wavelength converting particles; Scattering and stabilizing agents.

The polymer resin or the first radically polymerizable compound is a main component for forming the wavelength conversion layer formed from the composition, and is composed of a composite in which wavelength-converting particles, a scattering agent, and a stabilizer are combined with a mixture and particle powder. An appropriate kind may be selected in consideration of acidity and the like.

In one example, the polymer resin may have a solubility parameter of less than 10 (cal / cm ³ ) ^1/2 .

Thus, a resin having a solubility parameter of less than 10 (cal / cm ³ ) ^1/2 may be referred to as a hydrophobic polymer resin. The manner of obtaining the solubility parameter is not particularly limited and may be in accordance with methods known in the art. For example, the parameter may be calculated or obtained according to a method known in the art as a so-called Hansen solubility parameter (HSP).

When the hydrophobic polymer resin is used as the polymer resin, the dispersibility of the wavelength converting particles and the composite thereof, and the like can be adequately ensured, and it can be effective to achieve the desired wavelength conversion efficiency.

The type of the polymer resin is one having the above-described solubility parameter range, and for example, acrylic, silicone, hydrocarbon polymer or urethane resin may be exemplified, but is not limited thereto.

In one example, the polymer resin may be polybutadiene, polyisobutylene, polyethylene, polypropylene, poly (1-decene), polystyrene, 1-octadecene, 1-nonadecene, cis-2-methyl-octadecene, Or a hydrocarbon polymer such as 1-heptadecene, 1-hexadecene, 1-pentadecene, 1-tetradecene, 1-tridecene, 1-undecene or 1-dodecene. As such, when the hydrocarbon polymer is used as the hydrophobic polymer resin, dispersion of the wavelength particles and stability under high temperature and high humidity conditions can be effectively ensured.

The composition for optical films can contain a 1st radically polymerizable compound.

The first radically polymerizable compound may be a polymerizable monomer, an oligomer, or a polymer as a main agent of the wavelength conversion layer.

In one example, the first radically polymerizable compound may have a solubility parameter of less than 10 (cal / cm ³ ) ^1/2 of a single polymer. That is, the first radically polymerizable compound may be a hydrophobic polymerizable compound. As described above, when the hydrophobic polymerizable compound is polymerized to form the wavelength conversion layer, dispersibility and stability of the wavelength conversion particle and the composite thereof can be achieved. In another example, the solubility parameter of the first radically polymerizable compound is 3 (cal / cm ³ ) ^1/2 or more, 4 (cal / cm ³ ) ^1/2 or more or about 5 (cal / cm ³ ) ^1/2 It may be abnormal.

The first radically polymerizable compound may satisfy any of the above-described solubility parameter ranges and may be, for example, any one selected from the group consisting of a compound represented by the following Chemical Formula 1, a compound represented by the following Chemical Formula 2, and a compound represented by the following Chemical Formula 3. have.

[Formula 1]

[Formula 2]

[Formula 3]

In Formulas 1 to 3, Q is each independently hydrogen or an alkyl group,

U is each independently an alkylene group, an alkenylene group or an alkynylene group or an arylene group, B is a straight or branched chain alkyl group having 5 or more carbon atoms or an alicyclic hydrocarbon group, Y is an oxygen atom or a sulfur atom, and X is an oxygen atom , A sulfur atom or an alkylene group, Ar is an aryl group, n is any number.

In the present application, the term "alkyl group" may mean an alkyl group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms, unless otherwise specified. The alkyl group may be linear, branched or cyclic. In addition, the alkyl group may be optionally substituted with one or more substituents.

In the present application, the term "alkylene group" may mean an alkylene group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms, unless otherwise specified. The alkylene group may be linear, branched or cyclic. In addition, the alkylene group may be optionally substituted with one or more substituents.

In the present application, the term "alkenylene group" or "alkynylene group", unless otherwise specified, includes 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms, or 2 to 4 carbon atoms. It may mean a kenylene group or an alkynylene group. The alkenylene group or alkynylene group may be linear, branched or cyclic. In addition, the alkenylene group or alkynylene group may be optionally substituted with one or more substituents.

The term "arylene group" in the present application may refer to a divalent moiety derived from a compound or a derivative thereof including a structure in which benzene or two or more benzenes are condensed or bonded, unless otherwise specified. The arylene group may have a structure containing, for example, benzene, naphthalene or fluorene.

The term "aryl group" in the present application may refer to a monovalent moiety derived from a compound or a derivative thereof including a structure in which a benzene ring or a structure in which two or more benzene rings are condensed or bonded, unless otherwise specified. The range of the aryl group may include a functional group commonly referred to as an aryl group as well as a so-called aralkyl group or an arylalkyl group. The aryl group may be, for example, an aryl group having 6 to 25 carbon atoms, 6 to 21 carbon atoms, 6 to 18 carbon atoms, or 6 to 12 carbon atoms. Examples of the aryl group include phenyl group, phenoxy group, phenoxyphenyl group, phenoxybenzyl group, dichlorophenyl, chlorophenyl, phenylethyl group, phenylpropyl group, benzyl group, tolyl group, xylyl group or naphthyl group. Can be. In addition, the aryl group may be optionally substituted with one or more substituents.

Examples of the substituent that may be optionally substituted with the alkyl group, alkylene group, alkenylene group, alkynylene group, arylene group or aryl group in the present application include a halogen, alkyl group or aryloxy group such as hydroxy group, chlorine or fluorine, etc. It may be, but is not limited thereto.

In one example, Q of Formula 1 is hydrogen or an alkyl group, and B may be a straight or branched chain alkyl group or alicyclic hydrocarbon group having 5 or more carbon atoms.

In Formula 1, B may be a straight or branched chain alkyl group having 5 or more carbon atoms, 7 or more carbon atoms, or 9 or more carbon atoms. As such, a compound containing a relatively long chain alkyl group is known as a relatively nonpolar compound. The upper limit of the carbon number of the linear or branched alkyl group is not particularly limited. For example, the alkyl group may be an alkyl group having 20 or less carbon atoms.

In another embodiment, B may be, in another example, an alicyclic hydrocarbon group, for example, an alicyclic hydrocarbon group having 3 to 20 carbon atoms, 3 to 16 carbon atoms, or 6 to 12 carbon atoms, and examples of such hydrocarbon group include cyclohexyl group or iso Bornyl group and the like can be exemplified. Thus, the compound which has alicyclic hydrocarbon group is known as a relatively nonpolar compound.

In one example, Q in formula 2 is hydrogen or an alkyl group, and U may be an alkenylene group, an alkynylene group or an arylene group.

In one example, in formula (3), Q is hydrogen or an alkyl group, U is an alkylene group, Y is a carbon atom, an oxygen atom or a sulfur atom, X is an oxygen atom, a sulfur atom or an alkylene group, and Ar is an aryl group , n can be any number, for example a positive integer in the range of 1 to 20, 1 to 16 or 1 to 12.

The composition for an optical film of this application may further contain the 2nd radically polymerizable compound phase-separated after superposition | polymerization with a 1st radically polymerizable compound.

As such, when the optical film is formed from a composition comprising two compounds which are phase-separated after polymerization, and the wavelength conversion particles are positioned only in a region in which either compound is polymerized, the wavelength conversion particles are present in the region where the wavelength conversion particles exist. It is possible to more effectively control other factors that may adversely affect the physical properties of the wavelength conversion particles such as an initiator or a crosslinking agent to provide an excellent optical film.

In one example, the composition for an optical film of the present application may form a hydrophilic region and a hydrophobic region that is phase separated from the hydrophilic region after polymerization, wherein the regions are respectively the second radical polymerizable compound and the first radical polymerizable. It may be a region formed by the compound.

Hereinafter, a region formed by polymerization of the first radically polymerizable compound may be referred to as a hydrophobic region or an emulsion region, and a region formed by polymerization of the second radically polymerizable compound may be referred to as a hydrophilic region or a matrix.

Specifically, the composition for an optical film of the present application may include, in addition to the first radically polymerizable compound, a second radically polymerizable compound which is phase-separated after the polymerization with the first radically polymerizable compound.

The term "phase-separated" means that when the composition for an optical film forms a wavelength conversion layer through a polymerization process or the like described later, regions which are phase-separated in the wavelength conversion layer, for example, relatively hydrophobic regions And two regions that are not mixed with each other, such as relatively hydrophilic regions, are separated from each other.

In one example, the second radically polymerizable compound may have a solubility parameter of a single polymer of 10 (cal / cm ³ ) ^1/2 or more. The solubility parameter of the second radically polymerizable compound is, in another example, about 11 (cal / cm ³ ) ^1/2 or more, 12 (cal / cm ³ ) ^1/2 or more, 13 (cal / cm ³ ) ^1/2 or more , At least 14 (cal / cm ³ ) ^1/2 or at least 15 (cal / cm ³ ) ^1/2 . The solubility parameter of the radically polymerizable compound is, in another example, about 40 (cal / cm ³ ) ^1/2 or less, about 35 (cal / cm ³ ) ^1/2 or less or about 30 (cal / cm ³ ) ^1/2 or less. Can be.

In a specific example, the second radically polymerizable compound may be a compound of Formula 4; A compound of formula 5; A compound of formula 6; A compound of formula (7); Nitrogen-containing radically polymerizable compounds; And it may be any one selected from the group consisting of (meth) acrylic acid or a radical polymerizable compound comprising a salt thereof.

[Formula 4]

[Formula 5]

[Formula 6]

[Formula 7]

In Formulas 4 to 7, each Q is independently hydrogen or an alkyl group, each U is independently an alkylene group, each independently is an alkylene group which may be substituted with a hydroxy group, and Z is hydrogen, an alkoxy group, an epoxy group or a monovalent group. A hydrocarbon group, X is a hydroxy group or a cyano group, and m and n are any number.

In the present application, the term "epoxy group", unless otherwise specified, may mean a cyclic ether having three ring constituent atoms or a compound containing the cyclic ether or a monovalent moiety derived therefrom. have. Examples of the epoxy group include glycidyl group, epoxyalkyl group, glycidoxyalkyl group or alicyclic epoxy group. In the above, the alicyclic epoxy group may mean a monovalent moiety derived from a compound containing an aliphatic hydrocarbon ring structure, wherein the two carbon atoms forming the aliphatic hydrocarbon ring also include an epoxy group. As the alicyclic epoxy group, an alicyclic epoxy group having 6 to 12 carbon atoms can be exemplified, for example, a 3,4-epoxycyclohexylethyl group or the like can be exemplified.

In the present application, the term "alkoxy group" may mean an alkoxy group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms, unless otherwise specified. The alkoxy group may be linear, branched or cyclic. In addition, the alkoxy group may be optionally substituted with one or more substituents.

The term "monovalent hydrocarbon group" in the present application may refer to a compound consisting of carbon and hydrogen or a monovalent moiety derived from a derivative of such a compound, unless otherwise specified. For example, the monovalent hydrocarbon group may contain 1 to 25 carbon atoms. As a monovalent hydrocarbon group, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, etc. can be illustrated.

In the present application, substituents that may be optionally substituted with the epoxy group, alkoxy group or monovalent hydrocarbon group include a hydroxy group; Halogen such as chlorine or fluorine; Epoxy groups such as glycidyl groups, epoxyalkyl groups, glycidoxyalkyl groups or alicyclic epoxy groups; Acryloyl group; Methacryloyl group; Isocyanate group; Thiol group; Aryloxy group; Or a monovalent hydrocarbon group may be exemplified, but is not limited thereto.

In Formulas 4, 5, and 7 m and n may be any number, for example, each independently may be a number in the range of 1 to 20, 1 to 16 or 1 to 12.

As said nitrogen-containing radically polymerizable compound, for example, an amide group-containing radically polymerizable compound, an amino group-containing radically polymerizable compound, an imide group-containing radically polymerizable compound, or a cyano group-containing radically polymerizable compound Etc. can be used. As said amide group-containing radically polymerizable compound, it is (meth) acrylamide or N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-isopropyl (meth), for example. Acrylamide, N-methylol (meth) acrylamide, diacetone (meth) acrylamide, N-vinylacetoamide, N, N'-methylenebis (meth) acrylamide, N, N-dimethylaminopropyl (meth) ) Acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam or (meth) acryloyl morpholine and the like can be exemplified, and examples of the amino group-containing radically polymerizable compound include aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, etc. can be illustrated, As an imide group containing radically polymerizable compound, N-isopropyl maleimide, N-cyclo Hexylmaleimide or itacone The like it can be illustrated, and a cyano group-containing radical polymerizable, but as the compound, can be a nitrile such as acrylonitrile or methacrylonitrile, exemplified by acrylonitrile, but is not limited thereto.

As salts of (meth) acrylic acid, for example, salts of (meth) acrylic acid with alkali metals including lithium, sodium, and potassium; Or salts with alkaline earth metals, including magnesium, calcium, strontium and barium, and the like, but are not limited thereto.

The first radically polymerizable compound and the second radically polymerizable compound may form an emulsion region and a matrix of the wavelength conversion layer, respectively, after polymerization.

The difference in solubility parameters of the first radically polymerizable compound and the second radically polymerizable compound can be controlled to implement an appropriate phase separation structure of the optical film.

In one example, the difference between the solubility parameters of the first radically polymerizable compound and the second radically polymerizable compound is 5 (cal / cm ³ ) ^1/2 or more, 6 (cal / cm ³ ) ^1/2 or more, 7 ( cal / cm ³ ) ^1/2 or greater, or about 8 (cal / cm ³ ) ^{1/2 or} greater. The difference is the value of the solubility parameter minus the small value. The upper limit of the difference is not particularly limited. The greater the difference in solubility parameters, the more suitable phase separation structures can be formed. The upper limit of the difference may be, for example, 30 (cal / cm ³ ) ^1/2 or less, 25 (cal / cm ³ ) ^1/2 or less, or about 20 (cal / cm ³ ) ^1/2 or less.

When the first radically polymerizable compound and the second radically polymerizable compound are included in the composition together with the wavelength converting particles, the wavelength converting layer formed from the composition is phase-separated after polymerization to form respective regions, and the wavelength converting particles Is located in the region formed by the first radically polymerizable compound or the region formed by the second radically polymerizable compound, and the desired dispersibility and stability of the wavelength conversion particles can be achieved.

The ratio of the first radically polymerizable compound and the second radically polymerizable compound in the composition is not particularly limited.

For example, the composition for an optical film may include 100 parts by weight to 1,000 parts by weight of the second radically polymerizable compound with respect to 100 parts by weight of the first radically polymerizable compound.

In another example, the composition for an optical film includes 5 to 50 parts by weight of the first radically polymerizable compound and 50 to 95 parts by weight of the second radically polymerizable compound, or 50 to 95 parts by weight of the first radically polymerizable compound and the second 5 to 50 parts by weight of the radical polymerizable compound. The term weight part in the present application means a weight ratio between components, unless otherwise specified.

The wavelength converting particles, scattering agents and stabilizers included in the composition may include without limitation those mentioned in the above-mentioned composites, and such wavelength converting particles, scattering agents and stabilizers may form the complex.

In one example, the scattering agent and the stabilizer may be included in the composition in a state in which it is bonded to the surface of the wavelength conversion particles to form a wavelength conversion composite.

Such wavelength converting particles may be included in a hydrophilic region or a hydrophobic region formed by polymerization of the composition for an optical film of the present application.

In one example, the wavelength conversion particles are included in the hydrophobic region formed by polymerization of the composition for an optical film of the present application, and may not be substantially included in the hydrophilic region.

The fact that the wavelength conversion particles are not substantially included in the present application means that, for example, the weight ratio of the wavelength conversion particles included in the corresponding region is 10% based on the total weight of the wavelength conversion particles included in the composition for the optical film. Or less than 9%, 8% or less, 7% or less, 6% or less, 5% or less, 4% or less, 3% or less, 2% or less, 1% or less, 0.5% or less, or 0.1% or less. have.

In this case, when forming two phase-separated regions and including the wavelength conversion particles only in one of the two regions, for example, a hydrophobic region, physical properties suitable for film formation formed from the composition for an optical film can be ensured. It is possible to secure adhesion with other layers, such as a barrier layer of an optical film, which will be described later, and adversely affect the physical properties of the wavelength conversion particles such as an initiator or a crosslinking agent in a region where the wavelength conversion particles exist when the optical film is formed. More effective control of other possible factors can result in a more durable film.

The ratio in the composition for an optical film of wavelength conversion particle | grains is not specifically limited, For example, it can select from a suitable range in consideration of desired optical characteristics.

For example, the wavelength conversion particles may be included in the composition at a ratio of 0.05 to 20 parts by weight, 0.05 to 15 parts by weight, 0.1 to 15 parts by weight, or 0.5 to 15 parts by weight with respect to 100 parts by weight of the solid content of the composition, but is not limited thereto. no.

The composition for optical films contains a scattering agent and a stabilizer in a predetermined ratio.

In one example, the scattering agent or stabilizer may be included in the composition within the range of 0.05 to 15 parts by weight relative to 100 parts by weight of the solids of the composition. In another example, the scattering agent or stabilizer may be included in the composition in a ratio of 0.05 to 15 parts by weight, 0.1 to 15 parts by weight or 0.5 to 15 parts by weight relative to 100 parts by weight of the solid content of the composition, but is not limited thereto.

The composition for an optical film of the present application may include a radical initiator for polymerization of the radically polymerizable compound.

The kind of radical initiator contained in the composition for optical films of this application is not specifically limited. As the initiator, a radical thermal initiator or a photoinitiator capable of generating a radical so as to induce a polymerization reaction by application of heat or irradiation of light can be used.

As the thermal initiator, for example, 2,2-azobis-2,4-dimethylvaleronitrile (V-65, Wako), 2,2-azobisisobutyronitrile (V-60, Azo initiators such as Wako (manufactured) or 2,2-azobis-2-methylbutyronitrile (V-59, made by Wako); Dipropyl peroxydicarbonate (Peroyl NPP, NOF (manufactured)), Diisopropyl peroxy dicarbonate (Peroyl IPP, NOF (manufactured)), Bis-4-butylcyclohexyl peroxy dicarbonate (Peroyl TCP, NOF (manufactured) )), Diethoxyethyl peroxy dicarbonate (Peroyl EEP, NOF (product)), diethoxyhexyl peroxy dicarbonate (Peroyl OPP, NOF agent), hexyl peroxy dicarbonate (Perhexyl ND, NOF agent) ), Dimethoxybutyl peroxy dicarbonate (Peroyl MBP, NOF (product)), bis (3-methoxy-3-methoxybutyl) peroxy dicarbonate (Peroyl SOP, NOF agent), hexyl peroxy pival Rate (Perhexyl PV, NOF), amyl peroxy pivalate (Luperox 546M75, Atofina), butyl peroxy pivalate (Perbutyl, NOF) or trimethylhexanoyl peroxide (Peroyl 355, NOF) Peroxy ester compounds such as (agent); Dimethyl hydroxybutyl peroxane neodecanoate (Luperox 610M75, Atofina), amyl peroxy neodecanoate (Luperox 546M75, Atofina) or butyl peroxy neodecanoate (Luperox 10M75, Atofina) Peroxy dicarbonate compounds such as; Acyl peroxides such as 3,5,5-trimethylhexanoyl peroxide or dibenzoyl peroxide; Ketone peroxide; Dialkyl peroxides; Peroxy ketal; Alternatively, one kind or two or more kinds of peroxide initiators such as hydroperoxide and the like can be used.

As the photoinitiator, a benzoin-based, hydroxy ketone-based, amino-ketone-based or phosphine oxide-based photoinitiator may be used. Specifically, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylamino acetophenone, 2,2-dimethoxy 2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenylketone, 2-methyl -1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone , p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-t-butylanthraquinone, 2-aminoanthraquinone, 2- Methyl thioxanthone, 2-ethyl thioxanthone, 2-chloro thioxanthone, 2,4-dimethyl thioxanthone, 2,4-diethyl thioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethylamino benzoic acid Ester, ol And [2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propanone] and 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide and the like can be used, but It is not limited.

The composition for optical films of this application can use suitably selecting what shows high solubility to a hydrophilic or hydrophobic component in the said initiator.

The content of the initiator in the composition for an optical film of the present application is not particularly limited, for example, the initiator may be included in the composition for an optical film in the range of 0.1% to 15% by weight relative to the total weight of the composition for the optical film, but is not limited thereto. It doesn't happen.

The composition for an optical film of the present application may further include a crosslinking agent, if necessary, in consideration of filming properties and the like. As a crosslinking agent, the compound which has two or more radically polymerizable groups can be used, for example.

As a compound which can be used as a crosslinking agent, polyfunctional acrylate can be illustrated. The multifunctional acrylate may mean a compound including two or more acryloyl groups or methacryloyl groups.

Examples of the polyfunctional acrylate include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and polyethylene glycol di ( Meta) acrylate, neopentylglycol adipate di (meth) acrylate, hydroxyl puivalic acid neopentylglycol di (meth) acrylate, dicyclopentanyl di (meth) Acrylate, caprolactone modified dicyclopentenyl di (meth) acrylate, ethylene oxide modified di (meth) acrylate, di (meth) acryloxy ethyl isocyanurate, allylated cyclohexyl di (meth) ) Acrylate, tricyclodecane dimethanol (meth) acrylate, dimethylol dicyclopentane di (meth) acrylate, ethylene oxide modified hexahydrophthalic acid di (meth) acrylate, tricyclo Candimethanol (meth) acrylate, neopentylglycol modified trimethylpropane di (meth) acrylate, adamantane di (meth) acrylate or 9,9-bis [4- (2-acryloyloxy Difunctional acrylates such as ethoxy) phenyl] fluorene and the like; Trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid-modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide Trifunctional acrylates such as modified trimethylolpropane tri (meth) acrylate, trifunctional urethane (meth) acrylate or tris (meth) acryloxyethyl isocyanurate; Tetrafunctional acrylates such as diglycerin tetra (meth) acrylate or pentaerythritol tetra (meth) acrylate; 5-functional acrylates, such as propionic acid modified dipentaerythritol penta (meth) acrylate; And dipentaerythritol hexa (meth) acrylate, caprolactone modified dipentaerythritol hexa (meth) acrylate or urethane (meth) acrylate (ex. Isocyanate monomers and trimethylolpropane tri (meth) acrylate 6 functional acrylates, such as reactants), etc. can be used. Moreover, as a polyfunctional acrylate, urethane acrylate, an epoxy acrylate, polyester acrylate, a polyether acrylate, etc. can also be used as a compound called what is called photocurable oligomer in the industry. An appropriate kind can be selected and used out of the above compounds.

As the crosslinking agent, a component capable of implementing a crosslinking structure by a radical reaction such as the polyfunctional acrylate, as well as, if necessary, crosslinking by a thermosetting reaction such as a known isocyanate crosslinking agent, epoxy crosslinking agent, aziridine crosslinking agent or metal chelate crosslinking agent Components that can implement the structure can also be used.

For example, the crosslinking agent may be included in the composition for an optical film in a range of 10% by weight to 50% by weight based on the total weight of the composition for an optical film of the present application, but is not limited thereto. can be changed.

The composition for an optical film of the present application may further include other components in addition to the aforementioned components.

For example, the composition for an optical film of the present application may further include an antioxidant (antioxidant), amphiphilic nanoparticles, etc., but is not limited thereto.

In one example, the composition for an optical film of the present application may include amphiphilic nanoparticles. In the present application, the term "amphiphilic nanoparticles" may refer to particles of nano dimensions that include both hydrophilic and hydrophobic properties, and for example, may refer to what are called surfactants in the industry. have.

Amphiphilic nanoparticles are located at the interface between the hydrophilic region and the hydrophobic region formed by polymerization of the composition for an optical film, and may serve to increase the stability of each region.

Amphiphilic nanoparticles can have different refractive indices than the hydrophilic and hydrophobic regions described above. Thus, by the scattering or diffusion of light by the amphiphilic nanoparticles, for example, the efficiency of generating white light can be further increased.

The refractive index of the amphipathic nanoparticles is, for example, the absolute value of the difference between the refractive index of the nanoparticle and the hydrophilic region, and the absolute value of the difference between the refractive index of the nanoparticle and the hydrophobic region is 0.01 to 1.5 or 0.05 to 0.5, respectively. May be in range.

The refractive index of the amphipathic nanoparticles is not particularly limited as long as it satisfies the above range, and may be, for example, in the range of 1.0 to 2.0. In the present application, the term refractive index is a value measured for light having a wavelength of about 550 nm, unless otherwise specified.

In one example, the amphiphilic nanoparticles may include a cell core including a nanocore portion and an amphiphilic compound surrounding the core portion. Amphiphilic compound is a compound containing both a hydrophilic site and a hydrophobic site simultaneously. For example, in the case where the core portion is hydrophobic, the hydrophobic portion of the cell portion of the amphiphilic nanoparticles may face the core, and the hydrophilic portion may be disposed outward so that the amphiphilic nanoparticles may be formed as a whole. In the hydrophilic portion of the cell portion of the amphipathic nanoparticles toward the core, the hydrophobic portion may be disposed outside to form the amphiphilic nanoparticles as a whole.

The ratio of the amphiphilic nanoparticles in the composition for an optical film of the present application may be, for example, in the range of 1% by weight to 10% by weight based on the total weight of the composition solid content for the optical film, but is not limited thereto. The above range may be appropriately modified in view of improvement of luminous efficiency.

The present application also relates to an optical film.

The optical film of the present application includes a wavelength conversion layer. In addition, the wavelength conversion layer is a wavelength conversion particle described above; And a stabilizer and a scattering agent bonded to the surface of the wavelength converting particle.

Such an optical film has a small decrease in wavelength conversion efficiency due to external factors such as oxygen or moisture even under high temperature and high humidity conditions, and an electron hole trap of wavelength conversion particles by a stabilizer and a scattering agent bonded to the wavelength conversion particles. ), The wavelength conversion efficiency can be improved.

In one example, the wavelength conversion layer included in the optical film may include wavelength conversion particles; And a stabilizer and a scattering agent bound to the surface of the wavelength conversion particle.

The wavelength conversion layer may be formed from the above-described composition for an optical film. When the composition for the optical film further includes not only the first radical polymerizable compound but also the second radical polymerizable compound, the wavelength conversion layer may be formed in a phase. Separation structures can be implemented.

In one example, the wavelength conversion layer may include two regions that are phase separated from each other. In addition, the wavelength conversion particle composite may be included in any one of the two regions separated from the phase.

In detail, the wavelength conversion layer may exist in a state where the hydrophilic region and the hydrophobic region are separated from each other to form respective regions, and may include a complex in the hydrophobic region.

The wavelength conversion layer included in the optical film of the present application may be, for example, an emulsion type layer.

In the present application, the term “layer in emulsion form” means that any one of two or more phases (eg, the first and second regions) that are not mixed with each other is a continuous phase in the layer. ) And the other region may refer to a layer having a form dispersed in the continuous phase to form a dispersed phase. In the above, the continuous phase and the dispersed phase may be solid, semi-solid or liquid phase, respectively, and may be the same phase or different phases. Generally, emulsion is a term mainly used for two or more liquid phases which are not mixed with each other, but the term emulsion in the present application does not necessarily mean an emulsion formed by two or more liquid phases.

In one example, the wavelength conversion layer may include a matrix forming the continuous phase and an emulsion region that is a dispersed phase dispersed in the matrix, and the wavelength conversion particle composite may include the matrix or May be located in the emulsion region.

By placing the wavelength conversion particle composite in the matrix or emulsion region of the wavelength conversion layer, the wavelength conversion efficiency and durability can be increased.

In one example, the wavelength conversion particle composite may be included in an emulsion region in the wavelength conversion layer of the optical film.

The wavelength conversion particle composite contained in the emulsion region may be, for example, 90% by weight, 91% by weight, 92% by weight, 93% by weight, 94% by weight of the total wavelength conversion particle composite included in the wavelength conversion layer. At least 95 wt%, at least 96 wt%, at least 97 wt%, at least 98 wt%, at least 99 wt%, at least 99.5 wt% or at least 99.9 wt%.

Forming two phase-separated regions within the wavelength conversion layer and substantially placing the wavelength conversion particle composite only in one of the two regions, specifically, in the emulsion region, ensures physical properties suitable for filming. It is advantageous to secure the adhesion between the wavelength conversion layer and another layer such as a barrier layer to be described later, and adversely affect the physical properties of the wavelength conversion particles such as an initiator or a crosslinking agent in a region where the wavelength conversion particles exist when the optical film is formed. Other factors can be more effectively controlled to form a durable film.

Specific types and physical properties of the wavelength conversion particles, the scattering agent and the stabilizer constituting the wavelength conversion particle composite are as described above.

In one example, the absolute value of the difference in refractive index between the scattering agent and the matrix or emulsion region may be at least 0.2. In another example, the absolute value of the refractive index difference between the scattering agent and the matrix or emulsion region may be at least 0.4. The upper limit of the absolute value of the difference in refractive index is not particularly limited and may be, for example, about 0.8 or less or about 0.7 or less.

The matrix or emulsion region included in the wavelength conversion layer of the optical film may be formed by the polymerization of the aforementioned first radically polymerizable compound or second radically polymerizable compound.

In one example, any one of the matrix and emulsion region included in the wavelength conversion layer may include polymerized units of the first radically polymerizable compound, and the other may include polymerized units of the second radically polymerizable compound.

The matrix included in the wavelength conversion layer of the optical film may be a continuous phase, for example, formed by polymerization of a second radically polymerizable compound.

In one example, the matrix included in the wavelength conversion layer is a compound of Formula 4 to 7; Nitrogen-containing radically polymerizable compounds; And (meth) acrylic acid or a polymerizable unit of any one compound selected from the group consisting of a radically polymerizable compound including a salt thereof.

The emulsion region included in the wavelength conversion layer of the optical film is dispersed in a continuous matrix, and may be, for example, in the form of particles.

In one example, the emulsion region may be in the form of particles having an average diameter in the range of 1 μm to 200 μm. In another example, the emulsion region may be in the form of particles having an average diameter in the range of about 1 μm to 50 μm or in the range of about 50 μm to 200 μm. The size of the particle form may be controlled by adjusting the proportion of the material forming the matrix and the emulsion region, or by using a surfactant or the like.

Such an emulsion region may be formed by, for example, polymerization of the aforementioned first radically polymerizable compound.

The emulsion region may include, for example, a wavelength converting particle composite, wherein the wavelength converting particles of the wavelength converting particle composite included in the emulsion region may be the green particles and / or the red particles described above.

In one example, the wavelength converting particles in the emulsion region may comprise green particles and red particles at the same time, where each particle may be located in a different region from each other in the emulsion region.

Specifically, the emulsion region absorbs light in the range of 420 nm to 490 nm and absorbs light in the A region and / or light in the range of 420 nm to 490 nm including the first wavelength converting particles capable of emitting light in the range of 490 nm to 580 nm. It may include a region B including the second wavelength conversion particles capable of emitting light in the range of 580nm to 780nm.

As such, when two kinds of wavelength-converting particles, such as green particles and red particles, are included in the emulsion region, by controlling the region in which the particles are located, the interactions between the particles can be minimized, so as to minimize color purity. Can increase.

The ratio of matrix and emulsion regions in the wavelength conversion layer is For example, the ratio of the wavelength conversion particles to be included in the wavelength conversion layer, the adhesion with other layers such as a barrier layer, the production efficiency of the emulsion structure which is a phase-separated structure, or the physical properties required for film formation are selected. Can be. For example, the wavelength conversion layer may include 5 to 40 parts by weight of the emulsion region relative to 100 parts by weight of the matrix. The proportion of the emulsion region may be at least 10 parts by weight or at least 15 parts by weight with respect to 100 parts by weight of the matrix. The ratio of the emulsion region may be 35 parts by weight or less with respect to 100 parts by weight of the matrix. In the above, the ratio of the weight of the matrix and the emulsion region is the ratio of the weight of each region itself, or the sum of the weights of all the components included in the region or the ratio of the main components or the weight of the material used to form the respective regions. It can mean a ratio.

The optical film of the present application may further include a barrier layer on the wavelength conversion layer. In one example, the optical film may include a barrier layer on one or both sides of the light emitting layer.

Such a barrier layer can protect the light emitting layer from a high temperature condition or a condition in which harmful external factors such as oxygen and moisture exist.

FIG. 1 shows a structure including a wavelength conversion layer 100 and barrier layers 300 disposed on both sides thereof as one exemplary optical film 200. For example, the barrier layer may be formed of a material having good stability, which is hydrophobic and does not cause yellowing even when exposed to light.

In one example, the barrier layer may be selected to have a refractive index in a range similar to that of the wavelength conversion layer in order to reduce loss of light at an interface between the wavelength conversion layer and the barrier layer.

The barrier layer may be, for example, a solid material, or a cured liquid, gel, or polymer, and may be selected from flexible or inflexible materials, depending on the application. The kind of material for forming the barrier layer is not particularly limited and may be selected from known materials including glass, polymers, oxides or nitrides and the like. The barrier layer is, for example, glass; Polymers such as poly (ethylene terephtalate) (PET); Or an oxide or nitride such as silicon, titanium or aluminum, or a combination of two or more of the above, but is not limited thereto.

The barrier layer may be present on both surfaces of the wavelength conversion layer, or only on one surface, as exemplarily shown in FIG. 1. In addition, the optical film may have a structure in which barrier layers exist on both surfaces as well as on the side surfaces thereof, and the wavelength conversion layer is entirely sealed by the barrier layer.

The present application also relates to a lighting device. An exemplary lighting device may include a light source and the optical film.

In one example, the light source and the optical film in the lighting device may be arranged to allow the light irradiated from the light source to enter the optical film. When the light irradiated from the light source is incident on the optical film, some of the incident light is not absorbed by the wavelength converting particles in the optical film and is emitted as it is, and another part is absorbed by the wavelength converting particles and then converted into light having a different wavelength. Can be released. Accordingly, by adjusting the wavelength of the light emitted from the light source and the wavelength of the light emitted by the wavelength conversion particles, it is possible to adjust the color purity or color of the light emitted from the optical film, it is possible to provide an optical film with improved luminous efficiency. .

In one example, white light may be emitted from the optical film when the wavelength conversion layer contains the appropriate amounts of the above-mentioned red and green particles and the light source is adjusted to emit blue light.

The kind of the light source included in the lighting device of the present application is not particularly limited, and an appropriate kind may be selected in consideration of the kind of the desired light. In one example, the light source may be a blue light source, for example, a light source capable of emitting light having a wavelength within a range of 420 to 490 nm.

2 and 3 are views exemplarily showing a lighting device including a light source and an optical film as described above.

As shown in FIGS. 2 and 3, the light source and the optical film in the lighting device may be arranged to allow light emitted from the light source to be incident on the optical film.

In FIG. 2, the light source 400 is disposed under the optical film 200, and thus light irradiated from the light source 400 in the upper direction may be incident to the optical film 200.

3 is a case where the light source 400 is disposed on the side of the optical film 200. Although not essential, when the light source 400 is disposed on the side of the optical film 200 as described above, the light from the light source 400 is more like the light guiding plate 500 or the reflecting plate 600. Other means may be included that allow for efficient incidence on the optical film 200.

2 and 3 is an example of the lighting device of the present application, in addition to the lighting device may have a variety of known forms, for this purpose may further include a variety of known configurations.

The lighting device of the present application as described above can be used for various applications. A representative use of the lighting device of the present application is a display device. For example, the lighting device may be used as a backlight unit (BLU) of a display device such as a liquid crystal display (LCD).

In addition, the lighting device may be a backlight unit (BLU) of a display device such as a computer, a mobile phone, a smartphone, a personal digital assistant (PDA), a gaming device, an electronic reading device, or a digital camera, indoor or outdoor lighting. It may be used in stage lighting, decorative lighting, accent lighting, or museum lighting, and the like, but may also be used in horticulture or special wavelength lighting required in biology, but the use of the lighting apparatus is not limited thereto.

Hereinafter, although an optical film etc. of this application are demonstrated concretely through an Example and a comparative example, the range of the said optical film etc. is not restrict | limited by the following example.

Example One.

Preparation of the composition for optical films (A1)

LA (lauryl acrylate, CAS No .: 2156-97-0, solubility parameter (HSP): about 8 (cal / cm ³ ) ^1/2 ), bisfluorene diacrylate (BD, bisfluorene diacrylate, CAS No .: 161182-73-6, solubility parameter (HSP): about 8 to 9 (cal / cm ³ ) ^1/2 ), trimethylolpropane triacylate (CAS No .: 15625-89-5), green particles (Quantum Dot particles) , Acid acetate and stabilizer (butanethiol) was mixed in a ratio of 10: 1: 0.1: 0.05: 0.1: 0.1 (LA: BD: TMPTA: green particles: scattering agent: stabilizer). Subsequently, Irgacure2959 and Irgacure907 were mixed to have a concentration of about 1% by weight as a radical initiator, and stirred for about 6 hours to prepare a composition for an optical film (A1).

Manufacture of optical film

The composition (A1) was placed at a thickness of about 100 μm between two barrier films (i-components) spaced at regular intervals, and irradiated with ultraviolet rays to induce radical polymerization to form a wavelength conversion layer. .

Example 2

Preparation of the composition for optical films (A2)

PEG (poly (ethyleneglycol) diacrylate, CAS No .: 26570-48-9, solubility parameter (HSP): about 18 (cal / cm ³ ) ^1/2 ), LA (lauryl acrylate, CAS No .: 2156-97- 0, solubility parameter (HSP): about 8 (cal / cm ³ ) ^1/2 ), bisfluorene diacrylate (BD, bisfluorene diacrylate, CAS No .: 161182-73-6, solubility parameter (HSP): about 8 to 9 (cal / cmcm ³ ) ^1/2 ), green particles (Quantum Dot particles), surfactant (polyvinylpyrrolidone), scattering agent (zinc acetate) and stabilizer (butanethiol) in 9: 1: 1: 0.1: 0.05: 0.1: 0.1 (PEGDA: LA: BD: Green Particles: Surfactant: Scattering Agent: Stabilizer) in a weight ratio. Subsequently, Irgacure2959 and Irgacure907 were mixed to have a concentration of about 1% by weight as a radical initiator, and stirred for about 6 hours to prepare a composition for an optical film (A2).

Manufacture of optical film

The composition (A2) was placed at a thickness of about 100 μm between two barrier films (i-component) spaced at regular intervals, and irradiated with ultraviolet rays to induce radical polymerization to form a wavelength conversion layer. . 4 is a photograph of a wavelength conversion layer formed in the above manner.

Comparative example One.

LA (lauryl acrylate, CAS No .: 2156-97-0, solubility parameter (HSP): about 8 (cal / cm ³ ) ^1/2 ), bisfluorene diacrylate (BD, bisfluorene diacrylate, CAS No .: 161182-73-6, solubility parameter (HSP): about 8 to 9 (cal / cm ³ ) ^1/2 ), trimethylolpropane triacylate (CAS No .: 15625-89-5), green particles (Quantum Dot particles) The wavelength conversion layer was manufactured in the same manner as in Example, except that the mixture prepared by mixing the mixture at a weight ratio of 10: 1: 0.1: 0.05 (LA: BD: TMPTA: green particles) was used.

Test Example One

The optical films prepared in Examples 1 and 2 and Comparative Example 1 were placed on the light emitting side of the light source that emits light in the blue region, and the light emitted from the light source was incident for about 24 hours. Then, the degree (damage degree) of decreasing the light quantity of the light emission wavelength band was confirmed through the light emission spectrum. 5 and 6 are observation results for Examples 1 and 2, and the degree of damage (decrease in luminescence efficiency) was about 22% and 4%, respectively. 7 is an observation result of Comparative Example 1, and the degree of damage (decrease in luminescence efficiency) was about 40%.

100: wavelength conversion layer
200: optical film
300: barrier layer
400: light source
500 light guide plate
600: reflective layer

Claims

Wavelength converting particles; And
It includes a stabilizer and a scattering agent bound to the surface of the wavelength conversion particles,
The stabilizer is a thiol-based ligand, the scattering agent is a wavelength conversion particle complex.

The method of claim 1,
The wavelength conversion particle composite is a wavelength conversion particle composite is a quantum dot or a polymer particle.

The method of claim 2,
Quantum dot is a wavelength conversion particle composite having a core / shell structure.

The method of claim 1,
Stabilizers and scattering agents are wavelength-converting particle composites that are bonded to different surfaces of the wavelength-converting particles.

delete

The method of claim 1 ,
Thiol-based ligand is alkane thiol or aryl thiol wavelength conversion particle complex.

delete

The method of claim 1 ,
Zinc salts include zinc acetate, zinc stearate, zinc sulfate, zinc chloride, zinc fluoride, zinc iodide, zinc A wavelength converting particle composite which is any one selected from the group consisting of bromide, zinc chlorate and zinc nitrate.

A polymer resin or a first radical polymerizable compound;
Wavelength converting particles;
Thiol-based ligand scattering agents; And
The composition for optical films containing a zinc salt stabilizer.

The method of claim 9,
A scattering agent and a stabilizer are bonded to the surface of the wavelength conversion particles to form a wavelength conversion particle composite.

The method of claim 9,
A scattering agent and a stabilizer are optical composition for bonding to different surfaces of the single wavelength conversion particles.

The method of claim 9,
The wavelength conversion particle is an optical film composition which is a quantum dot or a polymer particle.

delete

The method of claim 9 ,
The thiol-based ligand is an alkane thiol or aryl thiol composition for optical films.

delete

The method of claim 9 ,
Zinc salts include zinc acetate, zinc stearate, zinc sulfate, zinc chloride, zinc fluoride, zinc iodide, zinc A composition for an optical film, which is any one selected from the group consisting of bromide, zinc chlorate, and zinc nitrate.

The method of claim 9,
The first radically polymerizable compound has a solubility parameter of less than 10 (cal / cm ³ ) ^1/2 of a single polymer.

The method of claim 17,
The first radically polymerizable compound is any one selected from the group consisting of a compound of formula 1, a compound of formula 2 and a compound of formula 3:
[Formula 1]

[Formula 2]

[Formula 3]

In Chemical Formulas 1 to 3,
Each Q is independently hydrogen or an alkyl group,
In Formula 1, B is a straight or branched chain alkyl group having 5 or more carbon atoms or an alicyclic hydrocarbon group,
In formulas (1) and (3), each U independently represents an alkylene group, an alkenylene group or an alkynylene group, or an arylene group,
In Formula 2, U is an alkenylene group or an alkynylene group or an arylene group,
In formula (3), Y is an oxygen atom or a sulfur atom, X is an oxygen atom, a sulfur atom or an alkylene group, Ar is an aryl group, n is a positive integer within the range of 1-20.

The method of claim 9,
The composition for an optical film which further contains the 1st radically polymerizable compound and the 2nd radically polymerizable compound phase-separated after superposition | polymerization.

The method of claim 19,
The second radically polymerizable compound is a compound of formula (4); A compound of formula 5; A compound of formula 6; A compound of formula (7); Nitrogen-containing radically polymerizable compounds; And (meth) acrylic acid or a radically polymerizable compound containing a salt thereof, wherein the composition for an optical film is any one selected from the group consisting of:
[Formula 4]

[Formula 5]

[Formula 6]

[Formula 7]

In Formulas 4 to 7 each Q is independently hydrogen or an alkyl group,
Each U is independently an alkylene group,
A each independently represents an alkylene group which may be substituted with a hydroxy group,
Z is hydrogen, an alkoxy group, an epoxy group or a monovalent hydrocarbon group,
X is a hydroxy group or a cyano group,
m and n are each independently a number in the range of 1-20 .

Wavelength converting particles; And a wavelength conversion layer having a wavelength conversion particle composite including a stabilizer and a scattering agent bonded to a surface of the wavelength conversion particle.

The method of claim 21,
The wavelength conversion layer is a matrix that is continuous; And an emulsion region dispersed in the matrix, wherein the wavelength conversion particle composite is located in the matrix or emulsion region.

The method of claim 22,
The wavelength conversion particle composite located in the emulsion region is 90% by weight or more of the wavelength conversion particle composite present in the entire wavelength conversion layer.

A lighting device comprising the optical film of claim 21.

A display device comprising the lighting device of claim 24.