KR102078399B1 - Light emitting film - Google Patents

Abstract

The present application relates to an optical film, a method of manufacturing the same, a lighting device and a display device. The present application can provide an optical film capable of providing an illumination device having excellent color purity and efficiency and excellent color characteristics. The optical film of the present application can be stably maintained for such a long time excellent properties. The optical film of the present application can be used in various lighting devices as well as in various applications including photovoltaic applications, light filters or light converters and the like.

Description

Optical film {LIGHT EMITTING FILM}

The present application relates to an optical film, a method of manufacturing the same, an illumination device and a display device including the optical film.

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, for example, quantum dots, which vary in color of light emitted according to particle size, have been steadily being conducted. In particular, research has been actively conducted to increase the luminous efficiency of the quantum dot itself or the problem of efficiency reduction due to exposure to the gas such as oxygen.

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

The present application provides an optical film having excellent optical properties even at a high temperature and a method of manufacturing the same by minimizing the reduction of the luminous efficiency of the wavelength conversion particles for oxygen and the like.

In addition, the present application provides a lighting device and a display device including the optical film.

The present application has been made to solve the above problems, a wavelength conversion layer comprising a continuous merchant matrix and an emulsion region dispersed in the matrix, the wavelength conversion layer comprising a wavelength conversion particle present in the matrix or emulsion region; And an oxygen barrier layer including a polymer having a thioether group formed on one or both surfaces of the wavelength conversion layer.

In one example, the matrix of the wavelength conversion layer is a relatively hydrophilic region relative to the emulsion region, and may include wavelength converting particles, the wavelength converting particles included in the matrix based on the total weight of the wavelength converting particles. The weight ratio of may be less than 10%.

In one example, the emulsion region of the wavelength conversion layer is a relatively hydrophobic region compared to the matrix that is a continuous phase, may include wavelength conversion particles, the wavelength contained in the matrix based on the total weight of the wavelength conversion particles The weight ratio of the converting particles may be 90% or more.

Further, 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.

In one example, the polymer included in the oxygen barrier layer may be a polymer including polymerized units of a monomer having a thiol group and a monomer having an ethylenically unsaturated bond.

The present application also forms an oxygen barrier layer using a composition for forming an oxygen barrier layer comprising a monomer having a thiol group and a monomer having an ethylenically unsaturated bond on one or both sides of the wavelength conversion layer including the wavelength conversion particles. It relates to a method for producing an optical film comprising the step.

The wavelength conversion layer may be formed using a composition for forming a wavelength conversion layer containing a hydrophilic polymerizable compound and a hydrophobic polymerizable compound.

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

The present application can prevent oxidation of the wavelength conversion particles by oxygen or the like, and can provide an excellent optical film having excellent optical properties even at high temperatures.

In addition, the present application may include the wavelength conversion particles only in a portion of the wavelength conversion layer, thereby preventing the wavelength conversion efficiency of the wavelength conversion particles from being lowered by other additive materials, thereby providing an optical film having excellent optical characteristics.

Furthermore, the present application can provide a lighting device and a display device having excellent color purity and efficiency, including the optical film, and excellent color characteristics.

1 and 2 is a schematic diagram for an optical film of the present application.
3 and 4 is a schematic view of the lighting device of the present application.
5 and 6 show the results of evaluating the high temperature durability characteristics of the optical film according to the examples and comparison of the present application.

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 can be selected arbitrarily within the range of conditions necessary to achieve the purpose of the present application will be apparent to those skilled in the art. .

The present application forms two regions separated in the wavelength conversion layer and substantially positions the wavelength conversion particles in only one of the two regions, thereby minimizing the wavelength conversion efficiency by other materials except the wavelength conversion particles. The optical film which can be provided can be provided.

In addition, the optical film of the present application includes an oxygen barrier layer having a thio ether group, thereby preventing damage to the wavelength conversion particles due to the inflow of oxygen, and ultimately excellent optical properties having excellent optical properties and luminous efficiency even at high temperatures. Films may be provided.

That is, the optical film of the present application includes a wavelength conversion layer and an oxygen barrier layer. The wavelength conversion layer also includes two regions that are phase separated, and includes wavelength converting particles in any one of the two regions.

The term "wavelength converting layer" of the present application means a layer formed so as to absorb light from a light source and emit light having a wavelength equal to or different from that of the light source.

The term "wavelength converting particle" of the present application means a particle formed to absorb light having a predetermined wavelength and emit light having the same or different wavelength as the absorbed light.

The wavelength conversion layer includes two regions that are phase separated from each other.

In the present application, it is confirmed that the terms "phase-separated regions" are separated from each other as regions formed by two regions that do not mix with each other, for example, a relatively hydrophobic region and a relatively hydrophilic region. It may mean areas formed in a state capable of.

That is, the wavelength conversion layer of the present application may include a first region and a second region that is phase-separated from the first region.

In an example, a first region may be a hydrophilic region, and a second region may be a hydrophobic region among the first region and the second region of the wavelength conversion layer. In the present application, the hydrophilicity and hydrophobicity that distinguish the first and second regions are relative concepts, and the criteria for hydrophilicity and hydrophobicity are specifically provided that the two regions are separated from each other in the wavelength conversion layer. It is not limited.

The ratio of the hydrophilic first region and the hydrophobic second region in the wavelength conversion layer is not particularly limited. For example, the ratio may be selected in consideration of the ratio of the wavelength conversion particles to be included in the wavelength conversion layer, adhesion with other layers such as an oxygen barrier layer, or physical properties required for film formation. For example, the wavelength conversion layer may include 100 parts by weight of the first region and a second region of 10 parts by weight to 100 parts by weight.

In another example, the wavelength conversion layer may include 50 to 95 parts by weight of the first region and 5 to 50 parts by weight of the second region. Alternatively, the wavelength conversion layer may include 50 to 95 parts by weight of the second region and 5 to 50 parts by weight of the first region. The term weight part in the present application means a weight ratio between each component, unless otherwise specified.

In addition, the weight of the first and second regions may mean the sum of the weights of all the components that form each region or included in the 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 includes a matrix forming the continuous phase and an emulsion region that is a dispersed phase dispersed within the matrix, wherein the wavelength converting particle comprises the matrix or emulsion region Located in

The wavelength conversion layer including the matrix and the emulsion region may be formed by polymerization of a hydrophilic polymerizable compound and a hydrophobic polymerizable compound.

In the present application, the criteria for distinguishing the hydrophilicity and hydrophobicity between the hydrophilic polymerizable compound and the hydrophobic polymerizable compound are, for example, the regions separated from the phases described above when both compounds are relatively hydrophilic or hydrophobic and mixed with each other. It will not be specifically limited if it can be formed. In one example, the separation of hydrophilicity and hydrophobicity may be performed by a solubility parameter.

The solubility parameter in the present application means a solubility parameter of a homopolymer formed by polymerization of the hydrophilic or hydrophobic polymerizable compound, and through this, the degree of hydrophilicity and hydrophobicity of the compound can be determined. 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). Although not particularly limited, in the present application, a hydrophobic polymerizable compound may mean a radical polymerizable compound having a solubility parameter of less than about 10 (cal / cm ³ ) ^1/2 , and a hydrophilic polymerizable compound has a parameter of about 10 It may mean a radically polymerizable compound that is (cal / cm ³ ) ^1/2 or more.

In one example, the hydrophilic polymerizable compound may be ^one having a solubility parameter of at least 10 (cal / cm ³ ) ^1/2 of a single polymer. The solubility parameter of the hydrophilic 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, 14 (cal / cm ³ ) ^1/2 or more, or 15 (cal / cm ³ ) ^{1/2 or} more. The upper limit of the solubility parameter of the hydrophilic polymerizable compound is, for 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 Or less than ^{/ 2} .

The first region or matrix can be formed by polymerizing a hydrophilic polymerizable compound. For example, the first region or matrix may be a compound of Formula 1; A compound of Formula 2; A compound of formula 3; A compound of formula 4; Nitrogen-containing radically polymerizable compounds; And it may include any one of the polymerization unit selected from the group consisting of a radically polymerizable compound containing (meth) acrylic acid or a salt thereof.

 [Formula 1]

 [Formula 2]

 [Formula 3]

 [Formula 4]

In Formulas 1 to 4, 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 "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 "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 and the structure in which two carbon atoms forming the aliphatic hydrocarbon ring also form 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, the substituent which may be optionally substituted with the alkyl group, alkoxy group, alkylene group, epoxy group or monovalent hydrocarbon group, includes 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 Chemical Formulas 1, 2, and 4, m and n may be any numbers, and for example, may be independently 1 to 20, 1 to 16, or 1 to 12.

As the nitrogen-containing radical polymerizable compound in the above, for example, an amide group-containing radical polymerizable compound, an amino group-containing radical polymerizable compound, an imide group-containing radical polymerizable compound or a cyano group-containing radical polymerizable compound Etc. can be used. Examples of the amide group-containing radically polymerizable compound include (meth) acrylamide or N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, and N-isopropyl (meth). ) 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 itaconimi 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.

Further, 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 Etc. may be exemplified, but is not limited thereto.

In one example, the hydrophobic polymerizable compound may have a solubility parameter of less than 10 (cal / cm ³ ) ^1/2 . In another example, the solubility parameter of the hydrophobic polymerizable compound is, in another example, for example 3 (cal / cm ³ ) ^1/2 or more, 4 (cal / cm ³ ) ^1/2 or more or about 5 (cal / cm ^3). ) May be ^{1/2 or} more.

The second region or emulsion region may be formed by polymerizing a hydrophobic polymerizable compound. For example, the second region or the emulsion region may include any one polymerization unit selected from the group consisting of a compound of Formula 5, a compound of Formula 6, and a compound of Formula 7.

 [Formula 5]

 [Formula 6]

 [Formula 7]

In Formulas 5 to 7, each Q is independently hydrogen or an alkyl group, each U is independently an alkylene group, an alkenylene group or an alkynylene group or an arylene group, and B is a straight or branched chain alkyl group having 5 or more carbon atoms or an alicyclic hydrocarbon And 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, and n is any number.

In the present application, the term "alkenylene group or alkynylene group" means an alkenylene group having 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, unless otherwise specified. 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 including, for example, benzene, naphthalene or fluorene.

In the present application, the term "aryl group" 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.

As the substituent which may be optionally substituted in the alkenylene group, alkynylene group, arylene group or aryl group in the present application, a halogen, alkyl group or aryloxy group such as hydroxy group, chlorine or fluorine may be exemplified, but It is not limited.

In one example, Q of Formula 5 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 5, 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, and 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 6 is hydrogen or an alkyl group, and U may be an alkenylene group, an alkynylene group or an arylene group.

In one example, Q in formula 7 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 1-20, 1-16 or 1-12.

The emulsion region 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.

The wavelength conversion layer contains wavelength conversion particles. In addition, the wavelength conversion particles are included in the matrix or emulsion region.

The wavelength converting layer of the present application includes the wavelength converting particles in the matrix or emulsion region and substantially does not include the wavelength converting particles in the emulsion region or the matrix, resulting in a material included in other wavelength converting layers except for the wavelength converting particles. The fall of the wavelength conversion efficiency of a wavelength conversion particle can be prevented.

In a specific example, the wavelength converting particles may be included in the emulsion region in the wavelength converting layer and substantially not included in the matrix.

In the present application, the fact that the wavelength conversion particles are not substantially included in any region is, for example, when the total weight of the wavelength conversion particles included in the wavelength conversion layer is 100%. The weight percentage of the particles is 10% or less, 9% or less, 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 It may refer to the case of% or less.

That is, in the optical film of the present application, the weight ratio of the wavelength conversion particles included in the matrix may be 10% or less based on the total weight of the wavelength conversion particles included in the wavelength conversion layer.

Thus, if two phase-separated regions are formed in the wavelength conversion layer and the wavelength conversion particles are placed only in one of the two regions, for example, in the emulsion region, physical properties suitable for filming can be ensured. It is advantageous to secure the adhesion between the wavelength converting layer and another layer such as an oxygen barrier layer, which will be described later, and adversely affect the physical properties of the nanoparticles such as an initiator or a crosslinking agent in a region where the wavelength converting particles are present in forming the optical film. Other factors can be more effectively controlled to form a durable film.

The shape of the wavelength conversion particle is not particularly limited, and may be spherical or ellipsoid; Cylindrical or angular rod-shaped; polygon; Or amorphous and the like.

When the wavelength conversion particles are spherical, for example, the average particle diameter is about 100 nm or less, 90 nm or less, 80 nm or less, 70 nm or less, 60 nm or less, 50 nm or less, 40 nm or less, 30 nm or less, 20 nm or less Or about 15 nm or less, and the size of the particles may vary depending on the light of the wavelength to be emitted.

For example, the wavelength conversion particles may be referred to as particles (hereinafter, referred to as green particles) capable of absorbing light of any wavelength within a range of 420 to 490 nm to emit light of any wavelength within a range of 490 to 580 nm. ) Or particles capable of absorbing light of any wavelength within a range of 420 to 490 nm to emit light of any wavelength within a range of 580 to 780 nm (hereinafter, may be referred to as red particles).

That is, the wavelength converting particles absorb the light in the range of 420 nm to 490 nm and may absorb the light in the range of 490 nm to 580 nm and / or the light in the range of 420 nm to 490 nm to absorb the light in the range of 580 nm to 780 nm. And second wavelength converting particles capable of emitting light therein. The first wavelength converting particle may be the aforementioned green particle, and the second wavelength converting particle may be the aforementioned red particle.

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

As the wavelength converting particle, any of those exhibiting such action can be used without particular limitation. Representative examples of such particles may include, but are not limited to, nanostructures called so-called quantum dots.

Quantum dots that can be used in the present application can be formed using any suitable material, for example, inorganic conductive or semiconducting materials. Suitable semiconductor materials can be exemplified by Group II-VI, III-V, IV-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 and suitable combinations of two or more of the above semiconductors may be illustrated, but are not limited thereto.

The quantum dots may have a core-shell structure. The core-shell structure may include a core part representing a central part of the quantum dot and a cell part surrounding the core part.

More specifically, the quantum dot (core / cell) of the core-shell sturucture includes CdSe / ZnS, InP / ZnS, PbSe / PbS, CdSe / CdS, CdTe / CdS, or CdTe / ZnS. However, the present invention is not limited thereto.

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 the like, and various 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 may be one whose surface is modified to include one or more ligands or barriers. The ligand or barrier may be advantageous for improving the stability of the wavelength converting particles and protecting the wavelength converting particles from harmful external conditions including high temperature, high intensity, external gas or moisture, and the like. It can play a role in assigning characteristics.

In one example, the wavelength conversion particle may be a surface modified with a ligand.

As described above, the ligand formed through the surface modification of the wavelength conversion particle serves to exhibit suitable properties on the surface of the wavelength conversion particle, the formation method is known, such a method is limited in the present application Can be applied without. Such materials or methods are described, for example, in US Patent Publication No. 2008-0281010, US Publication No. 2008-0237540, US Publication No. 2010-0110728, US Publication No. 2008-0118755, US Patent No. 7,645,397 US Pat. No. 7,374,807, US Pat. No. 6,949,206, US Pat. No. 7,572,393, US Pat. No. 7,267,875, and the like, but are not limited thereto. In one example, the ligand is a molecule having an amine group (oleylamine, triethylamine, hexylamine, naphtylamine, etc.) or a polymer, a molecule having a carboxyl group (oleic acid, etc.) or a polymer, a molecule having a thiol group (butanethiol, hexanethiol, dodecanethiol, etc.) or Polymer, molecule having pyridine group (pyridine etc.) or polymer, molecule having phosphine group (triphenylphosphine etc.), molecule having phosphine group (trioctylphosphine oxide etc.), molecule having carbonyl group (alkyl ketone etc.), benzene ring It may be formed by a molecule (benzene, styrene, etc.) or a polymer, a molecule having a hydroxy group (butanol, hexanol, etc.) or a polymer or a molecule having a sulfone group (Sulfonic acid, etc.) or a polymer.

The wavelength conversion layer of the present application may include green particles and red particles at the same time. The green particles and the red particles are included in the emulsion region of the wavelength conversion layer, and may not be substantially included in the matrix.

In one example, the green particles and the red particles may be included in a grouped state in a state where respective regions are formed in the emulsion region.

For example, the emulsion region of the present application may be in the region A and / or in the range of 420 nm to 490 nm including first wavelength converting particles capable of absorbing light in the range of 420 nm to 490 nm to emit light in the range of 490 nm to 580 nm. It may include a region B including the second wavelength conversion particles that can absorb light to emit light in the range of 580nm to 780nm. The first wavelength converting particle may mean the green particle described above, and the second wavelength converting particle may mean the red particle described above.

Specifically, the region A of the emulsion region of the present application may include the first wavelength converting particles and may not substantially include the second wavelength converting particles. Similarly, the region B of the emulsion region may include the second wavelength converting particles and may not substantially include the first wavelength converting particles. The term "substantially free" may refer to a state in which the wavelength conversion particles excluding the first wavelength conversion particles are included in the ratio of 10 wt% or less in the region A compared to the total wavelength conversion particles in the region A, for example. Can be.

As described above, by including the A region including the first wavelength converting particles and / or the B region including the second wavelength converting particles in the emulsion region of the wavelength converting layer, the wavelength converting particles, for example, between green particles and It is possible to prevent a decrease in wavelength conversion efficiency due to random mixing of red particles.

The ratio in the wavelength conversion layer of the wavelength conversion particle is not particularly limited, and may be selected in an appropriate range in consideration of desired optical properties and the like. In one example, the wavelength conversion particles may be included in the wavelength conversion layer in a range of 0.05 wt% to 20 wt% based on the total weight of each of the phase separated regions or the total solid weight of the wavelength conversion layer, but is not limited thereto.

The wavelength conversion layer may include other components in addition to the aforementioned components. Examples of other components that may be included in the wavelength conversion layer may include, but are not limited to, amphiphilic nanoparticles and scattering particles described below.

In one example, the wavelength conversion layer may include amphipathic nanoparticles. In the present application, the term "amphiphilic nanoparticles" may refer to particles of nano dimensions that include both hydrophilic and hydrophobic properties, and may refer to, for example, so-called surfactants in the industry. have.

Amphiphilic nanoparticles can be present, for example, at the boundaries of the matrix and emulsion regions. The amphiphilic nanoparticles can enhance the stability of each region separated in the wavelength conversion layer.

The ratio of the amphiphilic nanoparticles of the present application may be, for example, in the range of 1 wt% to 10 wt% with respect to the total weight of the wavelength conversion layer, but is not limited thereto. In consideration of the above range may be appropriately modified.

The wavelength conversion layer may also include scattering particles. The scattering particles included in the wavelength conversion layer may further improve the optical characteristics of the wavelength conversion layer described later by controlling the probability that light incident on the wavelength conversion layer is introduced into the wavelength conversion particle.

The term "scattering particles" in this application is any kind of material that can scatter, refract or diffuse incident light with a refractive index different from that of the surrounding medium, for example, the matrix or emulsion region described below, and also having an appropriate size. May mean particles.

The scattering particles may, for example, have an average particle diameter of 100 nm or more, more than 100 nm, 100 nm to 20,000 nm, 100 nm to 15,000 nm, 100 nm to 10,000 nm, 100 nm to 5,000 nm, 100 nm to 1,000 nm or 100 nm to 500 nm. The scattering particles may have a shape such as spherical, elliptical, polyhedron or amorphous, but the shape is not particularly limited. As the scattering particles, for example, organic materials such as polystyrene or derivatives thereof, acrylic resins or derivatives thereof, silicone resins or derivatives thereof, or novolak resins or derivatives thereof, or silica, alumina, titanium oxide or zirconium oxide Particles comprising an inorganic material can be exemplified. The scattering particles may be formed of only one of the above materials or two or more of the above materials. For example, hollow particles such as hollow silica or core-cell structure particles may be used as scattering particles.

The ratio of the scattering particles in the wavelength conversion layer is not particularly limited, and for example, may be selected at an appropriate ratio in consideration of the path of light incident on the wavelength conversion layer.

The ratio of the scattering particles may be, for example, in the range of 1% to 20% by weight based on the total weight of the wavelength conversion layer, but is not limited thereto. Can be modified.

The composition for an optical film may further include additives such as an oxygen scavenger, a radical scavenger, an antioxidant, etc. in a required amount, in addition to the above components.

The optical film of the present application may include an oxygen barrier layer including a polymer having a thioether group. The oxygen barrier layer may be formed on one or both surfaces of the wavelength conversion layer.

In one example, as shown in FIG. 1, the optical film of the present application may include an oxygen barrier layer 200 including a polymer having a thio ether group formed on both surfaces of the wavelength conversion layer 300.

The oxygen barrier layer of the present application may include a polymer having a thio ether group.

The oxygen blocking layer of the present application may include a thio ether group in the polymer forming the oxygen blocking layer in order to prevent the wavelength conversion particles contained in the wavelength conversion layer from being oxidized by oxygen. The polymer containing the thio ether group may play a role of preventing oxidation by reacting with the peroxide radical introduced into the optical film.

The polymer included in the oxygen barrier layer may be used without limitation as long as it includes a thio ether group capable of achieving the above-described purpose of adopting the oxygen barrier layer. It may include a polymer unit of a monomer having an unsaturated bond.

The term "polymerization unit of a predetermined compound" in the present application may mean a state in which the predetermined compound is polymerized and included in the main chain or side chain of the polymer formed by polymerization of the predetermined compound.

In one example, the monomer having a thiol group may be any one selected from the group consisting of the following formulas (8) to (11).

[Formula 8]

[Formula 9]

[Formula 10]

[Formula 11]

In Formulas 8 to 11, A ₁ to A ₃ are each independently an alkylene group, R ₁ is an alkyl group, and R ₂ is hydrogen, an alkyl group, or -A ₄ -C (-A ₅ -OC (= O)- A ₆ -SH) _n R _(3-n) , wherein A ₄ to A ₆ are each independently an alkylene group, R is an alkyl group, and n is an integer of 1 to 3.

In a specific example, it may be preferable that A ₁ in Formula 8 is an alkylene group having 1 to 8 carbon atoms.

In a specific example, it may be preferable that R ₁ in Formula 9 is an alkyl group having 3 to 20 carbon atoms.

In a specific example, it may be preferable that A ₂ in Formula 10 is an alkylene group having 1 to 4 carbon atoms.

In a specific example, A- ₃ in Formula 11 is an alkylene group having 1 to 4 carbon atoms, R ₂ is hydrogen, an alkyl group having 4 to 12 carbon atoms, or -A ⁴ -C (-A ⁵ -OC (= O) -A ⁶ -SH) _n R _(3-n) , wherein A ⁴ to A ⁶ are each independently an alkylene group having 1 to 4 carbon atoms, and n is preferably 2 or 3. In particular, the alkyl group or alkylene group may be substituted with a thiol group, a hydroxy group or a carboxy group.

More specifically, the monomer having a thiol group is n-dodecane thiol, t-butyl mercaptan, n-butyl mercaptan, 1-octadecane thiol, trimethylol propane tris (3-mercapto thiol), 5-methyl-1H- Benzotriazole, pentaerythritol tetrakis (3-mercapto propionate) or glycol dimercaptoacetate may be exemplified but is not limited thereto.

The polymer unit ratio of the monomer having a thiol group in the polymer, for example, may be included in the polymer in a ratio of 20 to 80 parts by weight of the polymer unit relative to 100 parts by weight of the polymer. The term weight part may mean a weight ratio between components unless otherwise stated. It is possible to achieve the purpose of adopting the desired oxygen barrier layer within the range of the polymerization unit ratio as described above, and can prevent the decrease in luminous efficiency due to oxidation of the wavelength conversion particles.

The polymer included in the oxygen barrier layer of the present application may be a monomer having an ethylenically unsaturated bond.

In one example, the monomer having an ethylenically unsaturated bond may be used without limitation in the present application as long as the monomer having an unsaturated double bond is polymerized with a monomer having a thiol group to form a thioether group.

Specifically, the monomer having an ethylenically unsaturated bond may be a (meth) acrylic acid ester monomer. The term "(meth) acrylic acid" means acrylic acid or methacrylic acid, and the (meth) acrylic acid ester monomer may mean acrylic acid, methacrylic acid or derivatives thereof.

In one example, the (meth) acrylic acid esters that may be included as polymerized units in the polymer may be alkyl (meth) acrylates. The term "(meth) acrylate" means acrylate or methacrylate.

Specifically, the alkyl (meth) acrylate may be an alkyl (meth) acrylate having an alkyl group having 1 to 20 carbon atoms, for example methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) ) Acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2- Ethylbutyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, isononyl ( Meta) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, octadecyl (meth) acrylate or isobornyl (meth) Acryl Although the agent or the like can be illustrated, but is not limited thereto.

In another example, the (meth) acrylic acid esters that may be included as polymerized units in the polymer may be multifunctional (meth) acrylates.

In the present application, the term multifunctional (meth) acrylate may mean a (meth) acrylate having two or more radical polymerizable functional groups, and the radical polymerizable functional groups are acryloyl group, methacryloyl group, and acryloyl jade. Or a methacryloyloxy group.

Examples of the bifunctional acrylate compound among the polyfunctional acrylate compounds include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, butanediol (meth) acrylate, and hexanediol di (meth) acrylic. Laten, nonanediol di (meth) acrylate, ethoxylated hexanediol di (meth) acrylate, propoxylated hexanediol di (meth) acrylate, diethylene glycol di (meth) acrylate, polyethylene glycol di (meth) Acrylate, tripropylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, acrylate neopentyl glycol di (meth) acrylate, epoxidized neopentyl glycol di (meth) acrylate, tripropylene glycol Di (meth) acrylate, polypropylene glycol di (meth) acrylate, neopentylglycol di (meth) acrylate, ethoxylated Neopentylglycol di (meth) acrylate, tripropylene glycol di (meth) acrylate or hydroxypivalate neopentylglycol di (meth) acrylate and the like.

Examples of the trifunctional or higher acrylate compound among the multifunctional acrylate compounds include trimethylolpropane tri (meth) acrylate, ethoxylated trimethylolpropane tri (meth) acrylate, and propoxylated trimethylolpropane tri (meth). Acrylate, tris2-hydroxyethylisocyanurate tri (meth) acrylate or glycerin tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol tri (meth) acrylate or di Trifunctional acrylate compounds such as trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol tetra (meth) acrylate Dipentaerythritol penta (meth) acrylate, ztrimetholpropane penta (meth) arc Acrylate, dipentaerythritol hexa (meth) acrylate and the like or ditrimethylolpropane hexa (meth) three or more multi-functional acrylate-functional compounds, such as acrylate.

The monomer having an ethylenically unsaturated bond may be exemplified by vinyl monomers such as styrene or methyl styrene, in addition to the above-mentioned kinds.

The polymer unit ratio of the monomer which has an ethylenically unsaturated bond in the said polymer can be contained in a polymer in the polymer unit ratio of 30-70 weight part, for example. The term weight part may mean a weight ratio between components unless otherwise stated. It is possible to achieve the purpose of adopting the desired oxygen barrier layer within the range of the polymerization unit ratio as described above, and can prevent the decrease in luminous efficiency due to oxidation of the wavelength conversion particles.

The polymer included in the oxygen barrier layer includes a polymer unit of a monomer having a thiol group and a monomer having an ethylenically unsaturated bond, thereby having a thio ether group, and converting the wavelength due to oxygen introduced into the optical film. It can serve to prevent oxidation of the particles.

The polymer of the present application may further include a polymerized unit of a monomer having a crosslinkable functional group.

In one example, the crosslinkable functional groups of the monomer having a crosslinkable functional group of the present application are acryloyl group, acryloyloxy group, methacryloyl group, methacryloyloxy group, hydroxy group, isocyanate group, glycidyl group, epoxy group, It may be an amine group or a carboxy group. The monomer having the crosslinkable functional group is variously known, and in the present application, an appropriate kind of the monomer may be selected and used in consideration of the desired glass transition temperature of the polymer or the reactivity with the crosslinking agent described later.

The oxygen barrier layer of the present application may further include a crosslinking agent. In one example, the crosslinking agent may be a multifunctional crosslinking agent including two or more functional groups in one molecule. As used herein, the term "multifunctional crosslinking agent" may refer to a multifunctional compound including two or more, for example, 2 to 6, functional groups capable of reacting with a crosslinkable functional group of a polymer. Two or more functional groups included in one molecule may be functional groups of the same or different species.

As the multifunctional crosslinking agent in the present application, as a functional group capable of reacting with the crosslinkable functional group, acryloyl group, acryloyloxy group, methacryloyl group, methacryloyloxy group, carboxyl group, acid anhydride group, vinyl ether group The compound containing 1 or more types, for example, 1-2 types of functional groups, such as an amine group, a carbonyl group, an isocyanate group, an epoxy group, an aziridinyl group, a carbodiimide group, or an oxazoline group, can be used.

The polymer may, for example, have a glass transition temperature in the range of -80 ° C to 120 ° C. It is possible to ensure the desired oxygen barrier properties of the oxygen barrier layer within this glass transition temperature range.

The polymer included in the oxygen barrier layer may have a weight average molecular weight in the range of, for example, 500 to 1,500,000. As used herein, the term weight average molecular weight may mean a conversion value for standard polystyrene measured by gel permeation chromatography (GPC), and unless otherwise specified, the molecular weight of a polymer may mean the weight average molecular weight of the polymer. Can be.

The oxygen barrier layer may further include various known components in addition to the aforementioned components.

In one example, the oxygen barrier layer may further include a tackifier.

Components that may be added to the oxygen barrier layer in addition to the above components may be exemplified by ultraviolet stabilizers, colorants, reinforcing agents, fillers, antifoaming agents, surfactants or plasticizers, but are not limited thereto.

The thickness of the oxygen barrier layer may be in the range of 5 to 200 μm, for example. It is possible to ensure the desired oxygen barrier properties within the thickness range.

The optical film of the present application may further include a barrier layer on one or both surfaces of the wavelength conversion layer.

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

In one example, as shown in FIG. 2, the optical film of the present application sequentially includes a barrier layer 100; Oxygen barrier layer 200; The wavelength conversion layer 300; Oxygen barrier layer 200; And a barrier layer 100.

The barrier layer may be formed of, for example, a material that is hydrophobic and has good stability such that yellowing does not occur even when exposed to light.

In an 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 can be, for example, a solid material, or a cured liquid, gel, or polymer, and can 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 PET (poly (ethylene terephtalate)) and the like; 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 optical film of the present application sequentially an oxygen blocking layer on one side or both sides of the aforementioned wavelength conversion layer; Alternatively, by including an oxygen barrier layer and a barrier layer, excellent oxygen barrier properties can be ensured.

The present application also relates to a method for producing an optical film.

In one example, the method for producing an optical film of the present application comprises a composition for forming an oxygen barrier layer comprising a monomer having a thiol group and a monomer having an ethylenically unsaturated bond on one or both sides of the wavelength conversion layer including the wavelength conversion particles. It may include the step of forming an oxygen barrier layer using.

In the manufacturing method of the present application, by forming a wavelength conversion layer including two regions separated in phase and an oxygen blocking layer having a thio ether group on the wavelength conversion layer, the oxygen blocking property is excellent, and the wavelength conversion particles are other materials. It is possible to provide an optical film which can prevent the light emission characteristic from being lowered and ensure excellent optical properties.

The method of manufacturing an optical film of the present application may include forming an oxygen barrier layer using a composition comprising a monomer having a thiol group and a monomer having an ethylenically unsaturated bond.

In one example, the method of forming an oxygen barrier layer on one or both sides of the wavelength conversion layer is applied to the oxygen barrier layer forming composition comprising the above-described components on one side or both sides of the pre-formed wavelength conversion layer, then heat Or curing by applying light.

In another example, the method of forming an oxygen barrier layer on one or both surfaces of the wavelength conversion layer may include applying and curing the above-described composition for forming an oxygen barrier layer on the barrier layer to form an oxygen barrier layer and then including an oxygen barrier layer. The barrier layers may be spaced apart at predetermined intervals, and may be formed by injecting a composition for forming a wavelength conversion layer.

In addition to the above components, the composition for forming an oxygen barrier layer may include a monomer having a crosslinkable functional group, a crosslinking agent or a radical initiator.

The wavelength conversion layer of this application can be formed using the composition for wavelength conversion layer formation containing a wavelength conversion particle, a hydrophilic polymeric compound, and a hydrophobic polymeric compound.

In one example, the method for forming the wavelength conversion layer comprises a known coating method, for example, a composition for forming a wavelength conversion layer containing the wavelength conversion particles, the hydrophilic polymerizable compound and the hydrophobic polymerizable compound on an arbitrary substrate film. After coating using methods such as bar coating, gravure coating, reverse roll coating, reverse gravure coating, slot die coating, comma coating, spray coating, knife coating, die coating, dip coating, micro gravure coating or wire bar coating, Curing may be included.

In another example, the wavelength conversion layer may be formed by injecting a composition for forming a wavelength conversion layer while the oxygen barrier layer and the barrier layer are stacked and spaced apart, and then cured to sequentially form an optical film as illustrated in FIG. 2. From what is formed, it may be manufactured.

The composition for forming a wavelength conversion layer may further include a radical initiator, a crosslinking agent, scattering particles, amphipathic particles, and the like, in addition to the above components.

The kind of radical initiator 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 an initiator, the thing which shows high solubility to a hydrophilic component or a hydrophobic component can be selected from the said initiator, For example, a hydroxy ketone compound, a water dispersion hydroxy ketone compound, an amino ketone compound, or a water dispersion amino ketone compound, etc. are used. May be used, but is not limited to such.

The content of the initiator is not particularly limited, for example, the initiator may be included in the composition in the range of 0.1% to 15% by weight relative to the total weight of the composition forming the wavelength conversion layer, but is not limited thereto.

For example, in consideration of filming properties, if necessary, the composition for forming a wavelength conversion layer may further include a crosslinking agent. 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 may be selected and used from among the above compounds.

As the crosslinking agent, a component capable of implementing a crosslinking structure by a radical reaction such as the multifunctional 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 in a range of 10 wt% to 50 wt% based on the total weight of the composition for forming a wavelength conversion layer of the present application, but is not limited thereto. The range is changed in consideration of physical properties of the film. Can be.

The composition for forming a wavelength conversion layer may include a hydrophilic polymerizable compound and a hydrophobic polymerizable compound.

The method for including a hydrophilic polymerizable compound and a hydrophobic polymerizable compound in the composition for forming a wavelength conversion layer may include, for example, separately preparing a hydrophilic polymerizable composition and a hydrophobic polymerizable composition, and then mixing and including the hydrophilic polymerizable composition; Or a method of mixing wavelength converting particles with the hydrophilic polymerizable compound and the hydrophobic polymerizable compound at once; Etc., but is not limited thereto.

According to the above method, phase separation may occur during a curing process, specifically, polymerization, and a wavelength conversion layer including a phase separated first region (matrix) and a second region (emulsion region) may be formed. Further, by including the wavelength conversion particles in any one of the first region (matrix) or the second region (emulsion region) and substantially no wavelength conversion particles in the other region, the optical properties are excellent and the initiator The problem that the luminous efficiency of wavelength conversion particle | grains falls by another substance etc. can be prevented.

The second region formed according to the method for manufacturing the optical film of the present application may include, for example, an A region and / or a B region each including different wavelength converting particles.

In one example, to obtain a wavelength conversion layer having a second region including A region and B region, green particles, a hydrophilic polymerizable compound and a hydrophobic polymerizable compound are mixed to prepare a first mixture, and a red particle and After mixing a hydrophilic polymerizable compound and a hydrophobic polymerizable compound to prepare a second mixture, a method of preparing a composition for forming a wavelength conversion layer by mixing the first mixture and the second mixture may be used. It is not.

The method of curing the composition after forming the composition for forming the wavelength conversion layer on any substrate is not particularly limited. For example, an appropriate range of heat is applied so that the initiator included in each composition can be activated. Or by applying electromagnetic waves such as ultraviolet rays.

The manufacturing method of the optical film of the present application may further perform the step of forming a barrier layer, if necessary.

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 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-described 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 in the range of 450 to 490 nm.

3 and 4 are views exemplarily showing a lighting device including a light source and an optical film as described above.

As shown in FIGS. 3 and 4, the light source and the optical film in the lighting apparatus may be arranged to allow light emitted from the light source to be incident on the optical film.

In FIG. 3, the light source 400 is disposed under the optical film 500, and thus light irradiated from the light source 400 in the upper direction may be incident to the optical film 500.

4 is a case where the light source 400 is disposed on the side of the optical film 500. Although not essential, when the light source 400 is disposed on the side of the optical film 500 as described above, the light from the light source 400, such as the light guiding plate 600 or the reflecting plate 700, is more visible. Other means may be included that allow for efficient incidence on the optical film 400.

3 and 4 is one 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. Representative applications to which the lighting device of the present application may be applied include 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, and an indoor or outdoor lighting. It may be used for stage lighting, decorative lighting, accent lighting, or museum lighting, and the like, but may also be used for horticulture or special wavelength lighting required in biology, but the use of the lighting apparatus is not limited thereto.

Hereinafter, an optical film and the like of the present application will be described in detail through Examples and Comparative Examples, but the scope of the optical film and the like is not limited to the following Examples.

Example  One.

Oxygen Barrier layer  formation

The weight ratio of n-dodecane thiol: 1,6-hexanediol di (meth) acrylate: trimethylolpropane triacrylate (TMPTA): Irgacure907 is 2: 1: 1 on the barrier layers of the two upper and lower films. The mixture is obtained by stirring at: 0.05 for 2 hours. After coating, the coating was dried at 60 ° C. for 2 minutes, and cured through UV irradiation (500 mJ / cm ² ) to form an oxygen barrier layer.

Manufacture of optical film

Poly (ethyleneglycol) diacrylate (PEGDA, (poly (ethyleneglycol) diacrylate, CAS No .: 26570-48-9, solubility parameter (HSP): about 18 (cal / cm ³ ) ^1/2 ), lauryl acrylic Rate (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) and surfactant (polyvinylpyrrolidone) in 9: 1: 1: 0.1 The mixture was mixed at a weight ratio of: 0.1 (PEGDA: LA: BD: green particles: surfactant), and then Irgacure2959 and Irgacure907 were mixed to have a concentration of about 1% by weight, respectively, as a radical initiator, and stirred for about 6 hours to prepare a mixture. Thereafter, the quantum dot mixture is placed between the two upper and lower film films having the oxygen barrier layers spaced at regular intervals and coated to a thickness of about 100 μm, and Knife polymerization was induced and cured to form a wavelength conversion layer containing wavelength conversion particles, thereby producing an optical film.

Comparative example  One.

Except not forming an oxygen barrier layer, a wavelength conversion layer was formed in the same manner as in the wavelength conversion layer formation method of Example 1 to prepare an optical film.

Test Example  -Evaluation of high temperature durability

The change in luminous efficiency (Q.Y) at 60 ° C. high temperature according to the absorption spectrum (left) and the emission spectrum (right) of the optical films according to Example 1 and Comparative Example 1 was evaluated and shown in FIGS. 5 and 6 below. Specifically, as shown in FIGS. 5 and 6, when the oxygen barrier layer is present in Example 1 (FIG. 5) than in Comparative Example 1 (FIG. 6), it is confirmed that the durability characteristics at a high temperature with time are superior. Could.

100: barrier layer
200: oxygen barrier layer
300: wavelength conversion layer
400: light source
500: optical film
600: Light guide plate
700: reflector

Claims (20)

A wavelength conversion layer comprising a continuous phase matrix and an emulsion region dispersed in the matrix and comprising wavelength converting particles present in the matrix or emulsion region; And
It includes an oxygen barrier layer containing a polymer having a thioether group formed on one side or both sides of the wavelength conversion layer,
The polymer having a thioether group includes a polymer unit of a monomer having a thiol group and a monomer having an ethylenically unsaturated bond,
The monomer having a thiol group is any one selected from the group consisting of compounds represented by the following formulas 8 to 11 or 2-mercapto ethanol, glycidyl mercaptan, mercaptoacetic acid, 2-ethylhexylthioglycolate, 2 , 3-dimercapto-1-propanol, n-dodecane thiol, t-butyl mercaptan, n-butyl mercaptan, 1-octadecane thiol, trimethylol propane tris (3-mercapto propionate) or pentae Optical film which is Ritritol tetrakis (3-mercapto propionate):
[Formula 8]

[Formula 9]

[Formula 10]

[Formula 11]

In Formulas 8 to 11, A ₁ to A ₃ are each independently an alkylene group, R ₁ is an alkyl group, and R ₂ is hydrogen, an alkyl group, or -A ₄ -C (-A ₅ -OC (= O)- A ₆ -SH) _n R _(3-n) , wherein A ₄ to A ₆ are each independently an alkylene group, R is an alkyl group, and n is an integer of 1 to 3. The method of claim 1,
The matrix is a compound of Formula 1; A compound of Formula 2; A compound of formula 3; A compound of formula 4; Nitrogen-containing radically polymerizable compounds; And a radically polymerizable compound comprising (meth) acrylic acid or a salt thereof. An optical film comprising any one of polymerized units selected from the group consisting of:
[Formula 1]

[Formula 2]

[Formula 3]

[Formula 4]

Q in Formulas 1 to 4 are each 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. The method of claim 1,
The emulsion region may include an optical film including any one of polymerized units selected from the group consisting of a compound represented by Formula 5, a compound represented by Formula 6, and a compound represented by Formula 7:
[Formula 5]

[Formula 6]

[Formula 7]

In Chemical Formulas 5 to 7,
Each Q is independently hydrogen or an alkyl group,
In Formula 5, B is a straight or branched chain alkyl group having 5 or more carbon atoms or an alicyclic hydrocarbon group,
In Formulas 5 and 7, each U independently represents an alkylene group, an alkenylene group or an alkynylene group, or an arylene group,
In Formula 6, U is an alkenylene group, an alkynylene group or an arylene group,
In formula (7), 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 number in the range of 1-20. The method of claim 1,
The ratio of the wavelength conversion particle contained in an emulsion area | region is 90 weight% or more with respect to the total wavelength conversion particle contained in a wavelength conversion layer. The method of claim 1,
The emulsion region is an optical film in the form of particles having an average diameter in the range of 1 μm to 200 μm. The method of claim 1,
The emulsion region absorbs light in the range of 420 nm to 490 nm and includes the first wavelength converting particle capable of emitting light in the range of 490 nm to 580 nm, and absorbs light in the range of 420 nm to 490 nm to absorb light in the range of 580 nm to 780 nm. An optical film comprising at least one of region B including second wavelength converting particles capable of emitting light within. The method of claim 1,
The wavelength conversion particle is an optical film which is a quantum dot or a polymer particle. The method of claim 1,
The wavelength conversion layer absorbs light within the range of 420 nm to 490 nm, and the first wavelength conversion particle absorbs light within the range of 490 nm to 580 nm, and the second wavelength that absorbs light within the range of 420 nm to 490 nm and emits light within the range of 580 nm to 780 nm An optical film comprising at least one of wavelength converting particles. delete delete delete The method of claim 1,
The monomer which has an ethylenically unsaturated bond is an optical film which is a (meth) acrylic acid ester monomer. The method of claim 12,
The optical film whose (meth) acrylic acid ester monomer is alkyl (meth) acrylate. The method of claim 12,
The optical film whose (meth) acrylic acid ester monomer is a polyfunctional (meth) acrylate. The method of claim 1,
An optical film further comprising a barrier layer on one or both surfaces of the wavelength conversion layer. Monomer having a thiol group and an ethylenically unsaturated bond on one or both surfaces of the wavelength conversion layer including a continuous phase matrix and an emulsion region dispersed in the matrix and including wavelength converting particles present in the matrix or emulsion region. Forming an oxygen barrier layer using the composition for forming an oxygen barrier layer comprising a,
The monomer having a thiol group is any one selected from the group consisting of compounds represented by the following formulas 8 to 11 or 2-mercapto ethanol, glycidyl mercaptan, mercaptoacetic acid, 2-ethylhexylthioglycolate, 2 , 3-dimercapto-1-propanol, n-dodecane thiol, t-butyl mercaptan, n-butyl mercaptan, 1-octadecane thiol, trimethylol propane tris (3-mercapto propionate) or pentae Method for preparing an optical film which is Ritritol tetrakis (3-mercapto propionate):
[Formula 8]

[Formula 9]

[Formula 10]

[Formula 11]

In Formulas 8 to 11, A ₁ to A ₃ are each independently an alkylene group, R ₁ is an alkyl group, and R ₂ is hydrogen, an alkyl group, or -A ₄ -C (-A ₅ -OC (= O)- A ₆ -SH) _n R _(3-n) , wherein A ₄ to A ₆ are each independently an alkylene group, R is an alkyl group, and n is an integer of 1 to 3. The method of claim 16,
The wavelength conversion layer is a manufacturing method of the optical film formed using the composition for wavelength conversion layer formation containing a hydrophilic polymeric compound and a hydrophobic polymeric compound. An illuminating device comprising a light source and the optical film of claim 1, wherein the light source and the optical film are arranged to allow light from the light source to be incident on the optical film. The method of claim 18,
The light source emits light of any wavelength in the range of 420nm to 490nm. A display device comprising the lighting device of claim 18.

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