KR101959461B1

KR101959461B1 - Optical film

Info

Publication number: KR101959461B1
Application number: KR1020150107203A
Authority: KR
Inventors: 김선국; 박문수; 윤혁; 이성민
Original assignee: 주식회사 엘지화학
Priority date: 2015-07-29
Filing date: 2015-07-29
Publication date: 2019-03-18
Also published as: KR20170014225A

Abstract

The present invention relates to an optical film, a lighting device, and a display device.
The optical film of the present application relates to an optical film, a lighting device, and a display device that can be thinned while securing the desired oxygen barrier properties.

Description

Optical film {OPTICAL FILM}

The present invention relates to an optical film, a lighting device, and a display device.

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

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

In recent years, researches on a lighting device emitting white light by using a wavelength conversion particle, for example, a quantum dot, in which the color of light emitted varies depending on the size of a particle, is progressing steadily.

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

The present application provides a polarizing plate-integrated optical film capable of reducing the thickness, simplifying the process, and lowering the cost.

The present application also provides a lighting device and a display device including a polarizing plate-integrated optical film.

The present application is directed to solve the above problems, and is directed to an optical film including a wavelength conversion layer and a barrier polarizing plate. Wherein the wavelength conversion layer comprises wavelength converting particles and the barrier polarizing plate has an oxygen transmission rate (OTR) of 1 cc / m ² / day / atm or less at a temperature condition of 23 ° C and a relative humidity of 0%.

The optical film of the present application may further include a barrier layer, and the barrier layer may be located on the opposite side of the surface where the wavelength conversion layer is in contact with the base layer.

The optical film of the present application may further include a base layer, and the base layer may be positioned between the barrier polarizing plate and the wavelength conversion layer.

The present application also relates to a light source and an optical film, wherein the light source and the optical film are arranged such that light from the light source can be incident on the optical film.

The present application also relates to a display device comprising the illumination device.

The present application relates to an optical film, an illuminating device, and a display device which can achieve advantages such as thinning of an optical film, simplification of a process, and low cost while securing a desired oxygen barrier property.

Figures 1 to 3 are schematic diagrams of an exemplary optical film of the present application.
Figures 4 and 5 are schematic diagrams of an exemplary lighting device of the present application.

Hereinafter, the present application will be described in more detail with reference to embodiments and drawings, but is merely an embodiment limited to the gist of the present application. It should be understood, however, that the present application is not limited to the process conditions set forth in the following examples, and that the process may be arbitrarily selected within the scope of the conditions necessary to achieve the object of the present application, It is obvious.

The present application relates to optical films and their uses.

This application discloses a polarizing plate having barrier properties against oxygen and the like and capable of serving as a polarizing plate and not including a separate barrier layer on the base layer, And can provide its use.

The present application can also provide an optical film and its use that can solve problems such as complexity and cost in the process of forming a barrier layer on the upper and lower sides.

The present application relates to a wavelength conversion layer comprising wavelength conversion particles; And a barrier polarizing plate having an oxygen permeability (OTR) of 1 cc / m ² / day / atm or less at a temperature condition of 23 ° C and a relative humidity of 0%.

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

The optical film of the present application includes a barrier polarizing plate.

The term " barrier polarizing plate " as used in the present application means an optical element that has appropriate gas barrier properties and can make perfect polarized light from uneven light or arbitrary polarized light.

In one example, the barrier polarizing plate may have an oxygen transmission rate (OTR) of 1 cc / m ² / day / atm or less, 0.1 cc / m ² / day / atm or less, or 0.01 cc / m ² / day / atm or less.

The barrier polarizing plate can be formed by dying iodine and / or dichroic dye onto a film or sheet formed using, for example, a polymer known as a material of a polarizing plate.

Further, a composition comprising the above polymer and iodine and / or dichroic dye may be applied on any substrate to form a coating layer, or a barrier polarizing plate may be produced by extrusion or the like.

Examples of such a polymer include polyvinyl alcohol, nylon, polyvinyl chloride, polyvinyl fluoride, polyvinylidene chloride, polyacrylonitrile, ethylene vinyl alcohol copolymer, polycarboxylic acid, polyethyleneimine or ethylene vinyl acetate copolymer May be exemplified, preferably polyvinyl alcohol, but is not limited thereto. The term " polyvinyl alcohol " may include polyvinyl alcohol, a copolymer thereof and a modified product thereof.

In one example, the polyvinyl alcohol may have an average degree of polymerization in the range of 200 to 3,500, 300 to 2,000, or 500 to 1,500.

The polyvinyl alcohol may have a degree of hydrolysis of 80% or more, 90% or more, 95% or more, or 98% or more.

The physical properties of the polyvinyl alcohol may be, for example, a value measured on the basis of KS M ISO 15023-2 (Measurement of Physical Properties of Polyvinyl Alcohol (PVOH) Material). The polyvinyl alcohol resin can be produced by a known method, for example, by hydrolysis of polyvinyl acetate.

The term " dye " in the present application may mean a material capable of intensively absorbing and / or deforming light within a visible light region, for example, within a wavelength range of 400 nm to 800 nm, The term " dichroic dye " may mean a material capable of anisotropic absorption of light in at least a part or the entire range of the visible light region.

The dichroic dyes may be, for example, all kinds of dyes known to have the above-mentioned characteristics and capable of being aligned according to the orientation direction of the polymer such as polyvinyl alcohol.

In one example, the dichroic dye is a dye having a maximum absorbance in a visible light region, for example, 400 nm to 800 nm, and may be an azo compound, an anthraquinone compound, a phthalocyanine compound, an azomethine compound, Indigoid or thioindigoid compounds, merocyanine compounds, 1,3-bis (dicyanomethylene) indan compounds, azulene compounds such as azulene Quinophthalone compounds, triphenodioxazine compounds, indolo [2,3, b] quinoxaline compounds, quinoxaline compounds, quinoxaline compounds, Imidazo [1,2-b] -1,2,4 triazines), tetrazines (benzo), benzo A compound having a molecular skeleton of a naphthoquinones compound or a combination thereof, and the like can be used.

The barrier polarizing plate may contain 0.1 to 10 parts by weight, preferably 0.1 to 5 parts by weight, of dichroic dyes per 100 parts by weight of the polymer.

The barrier-type polarizing plate may have a glass transition temperature of 60 deg. C or higher, for example. Within the range of the glass transition temperature, the barrier-type polarizing plate can exhibit excellent durability, and appropriate gas barrier properties and polarization characteristics can be ensured. The glass transition temperature may be 65 deg. C or higher or 70 deg. C or higher in another example. The glass transition temperature may be 300 ° C or lower, 250 ° C or lower, 200 ° C or lower, 150 ° C or 100 ° C or lower in other examples. Such a glass transition temperature can be achieved by selecting a material having a high glass transition temperature as a material for forming a barrier polarizing plate, or, if necessary, through a suitable crosslinking or stretching process.

For example, the barrier polarizing plate may include a polymer such as the above-mentioned polyvinyl alcohol, and the polymer may be crosslinked.

Crosslinking of the polymer can be carried out, for example, using a suitable crosslinking agent. The crosslinking agent that can be used may be selected in consideration of the kind of the polymer forming the barrier polarizing plate, and the kind thereof is not particularly limited.

Examples of the crosslinking agent include, but are not limited to, inorganic acids such as boric acid and the like, polyvalent carboxylic acid compounds such as aldehyde compounds, siloxane compounds and succinic acid, and polyfunctional isocyanate compounds.

It is possible to ensure appropriate gas barrier properties and polarization characteristics by appropriate crosslinking, to have the above-mentioned glass transition temperature range, and to secure heat resistance.

The ratio of the cross-linking agent in the barrier-type polarizing plate can be adjusted for ensuring heat resistance and the like of the barrier-type polarizing plate. For example, the barrier polarizing plate may contain 3 to 5 parts by weight of a crosslinking agent based on 100 parts by weight of the main polymer. Within this range, a suitable gas barrier property and a glass transition temperature can be secured. In another example, the barrier polarizing plate may include a crosslinking agent in an amount of 3.1 to 4.9, 3.2 to 4.8, 3.3 to 4.7, 3.5 to 4.6, or 3.6 to 4.5 parts by weight based on 100 parts by weight of the main polymer.

The barrier-type polarizing plate may have optical anisotropy.

The range of the birefringence (DELTA n, reference wavelength: 550 nm) can be adjusted in consideration of the application to optical applications and the like in the case of having optical anisotropy. For example, the barrier polarizing plate may have a birefringence range of 0.005 or more, 0.01 or more, or 0.02 or more. In another example, the birefringence may be 0.3 or less, 0.2 or less, 0.1 or less, or 0.05 or less.

The barrier polarizing plate may be a stretched layer.

In one example, when the barrier polarizing plate is a film or a sheet made of the above-mentioned polymer, or in the case of a coating layer, the stretched layer can be formed by stretching the film, sheet or coating layer to an appropriate range.

The stretch layer may be a uniaxially stretched layer or a biaxially stretched layer or a multiaxially stretched layer. The above-mentioned method of stretching is known, and the stretching can be performed at a predetermined magnification, for example, through a uniaxial or biaxial stretching machine or the like.

In the case of a stretched layer, the stretching magnification can be adjusted to an appropriate range in consideration of the glass transition temperature, oxygen barrier properties, and polarization characteristics.

For example, the draw ratio of the stretched layer may be in the range of 1 to 7 times.

In another example, the draw ratio of the drawn layer may be in the range of 2 to 6 times or 3 to 5 times. The uniaxially or biaxially stretched stretched layer at the above-mentioned magnification ratio can be used as the barrier polarizing plate.

In another example, the stretching layer may be one stretched so that the ratio of the thickness (d) after stretching to the thickness (d ₀ ) before stretching satisfies the following formula (1).

[Equation 1]

d / d _o = λ ^-a

D is the thickness of the barrier polarizer after stretching, d _o is the thickness of the barrier polarizer before stretching, lambda is a number in the range of 2 to 8 or 5 to 6, and a may be in the range of 0.5 to 1.

The barrier-type polarizing plate may be one which is stretched before the barrier-type polarizing plate is formed on the base layer, which will be described later, or one which is integrated after the base layer and is then stretched.

The barrier-type polarizing plate may be subjected to a predetermined pretreatment process, for example, washing or swelling treatment, etc., before performing the stretching process. The conditions of the washing or swelling treatment process can be selected according to known process conditions in consideration of breakage of the barrier polarizing plate which can be generated by securing the barrier property of the barrier polarizing plate against gas such as oxygen, .

The thickness of the barrier polarizing plate may be set to a suitable thickness range in consideration of securing the blocking property against gas such as oxygen and the possibility of cracking due to warping of the laminate.

In one example, the barrier polarizer may have a thickness in the range of 0.1 to 100 [mu] m. The thickness may be 0.5 占 퐉 or more, 1 占 퐉 or more, 2 占 퐉 or more, 3 占 퐉 or more, 4 占 퐉 or more, or 5 占 퐉 or more. The thickness is not more than 95 탆, not more than 90 탆, not more than 85 탆, not more than 80 탆, not more than 75 탆, not more than 70 탆, not more than 65 탆, not more than 60 탆, not more than 55 탆, Mu m or less, 35 mu m or less, 30 mu m or less, 25 mu m or less, 20 mu m or less, 15 mu m or less, or 10 mu m or less.

The barrier polarizing plate may further include various additives in addition to the above-mentioned polymer and / or crosslinking agent.

In one example, the barrier polarizer may further comprise an oxygen absorbent or a water absorbent.

The kind of the oxygen absorbent usable in the present application is not particularly limited, and a compound known to have an oxygen absorbing function can be used without limitation.

For example, as the oxygen absorbing agent, a type showing an oxygen absorbing function through an oxidation reaction of unsaturated carbon or a type showing an oxygen absorbing function by photosensitive dye oxidation can be used.

Examples of the oxygen absorbing agent include a sulfite compound, vitamin E, vitamin C, tocopherol, or an unsaturated double bond-containing compound.

Examples of the unsaturated double bond-containing compound include squalene, a fatty acid compound, and polybutadiene. These compounds may contain, when necessary, an appropriate amount of a transition metal catalyst or ultraviolet sensitizer (UV sensitizer) and the like.

Therefore, the oxygen absorbent may further comprise the transition metal catalyst and / or ultraviolet sensitizer.

The oxygen absorbing agent may be contained in the barrier polarizer in a range of 2 to 400 parts by weight, 2 to 300 parts by weight, or 2 to 100 parts by weight based on 100 parts by weight of the above-mentioned polymer. Unless otherwise specified, the unit weight portion in the present application may mean the weight ratio between the components. The above ratios are illustrative, and the ratios can be changed in consideration of the kind of the oxygen absorbent or the desired performance.

The kind of the water absorbent that can be used in the present application is not particularly limited, and it has no ability to react with water and has the ability to absorb moisture, thereby limiting known compounds capable of imparting moisture barrier properties to the barrier polarizing plate Can be used without.

For example, the water absorbing agent may be a substance which is not reactive with moisture such as an oxide, a nitride, an oxynitride or a fluoride, and can exhibit a blocking property against moisture.

As the water absorbing agent, a plate-like mineral such as a nano-clay can be exemplified. The tabular compound such as the nano-clay can play a role of securing the barrier property against moisture and the like by lengthening the movement path of the water penetrated in the external environment.

In one example, the flaked mineral may have a width of about 100 to 1000 nm in width and / or height, and a distance between each layer of about 1 to 5 nm. These flaky minerals have no fear of agglomeration among the particles and can improve the durability and water barrier properties under high temperature and high humidity conditions due to the mechanical properties of the minerals.

As the oxide in the water absorbent, TiO ₂ , Ti ₃ O ₃ _, Al ₂ O ₃ , MgO, SiO, SiO ₂ , GeO, NiO, CaO, BaO, Fe ₂ O ₃ , Y ₂ O ₃ , ZrO ₂ , Nb ₂ O ₃ , CeO ₂ and the like can be exemplified. As the nitride, a metal nitride such as SiN can be exemplified. As the oxynitride, a metal oxynitride such as SiON can be exemplified, and a fluoride Metal fluorides such as MgF ₂ , LiF, AlF ₃ and CaF _2, and the like are exemplified, but the present invention is not limited thereto.

The water absorbing agent may be contained in the barrier polarizer in a range of 2 to 400 parts by weight, 2 to 300 parts by weight or 2 to 100 parts by weight based on 100 parts by weight of the above-mentioned polymer. The above ratios are illustrative, and the ratios can be changed in consideration of the kind of the water absorbent or the desired performance.

The optical film of the present application includes a wavelength conversion layer. The wavelength conversion layer includes wavelength conversion particles.

The term " wavelength converting layer " in the present application may mean a layer that includes wavelength converting particles and absorbs light of a predetermined wavelength to emit light of the same or a different wavelength.

The term " wavelength conversion particle " in the present application may mean particles formed by absorbing light of a predetermined wavelength and emitting light of the same or different wavelength as the absorbed light.

The shape of the wavelength conversion particle included in the wavelength conversion layer is not particularly limited and may be spherical, ellipsoidal, polygonal or amorphous.

The wavelength converting particles may have 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, 50 nm or less, 40 nm or less, 30 nm or less, nm or less, and the size of the particles may be different depending on the light of the wavelength to be emitted.

For example, the wavelength converting particles may be particles (hereinafter, referred to as green particles) capable of absorbing light of any wavelength within the range of 420 to 490 nm and emitting light of any wavelength within the range of 490 to 580 nm. ) And / or particles capable of absorbing light of any one wavelength within the range of 450 to 490 nm and emitting light of any wavelength within the range of 580 to 780 nm (hereinafter referred to as red particles) .

For example, the wavelength conversion layer absorbs light within the range of 420 nm to 490 nm and absorbs light within the range of 420 nm to 490 nm and / or first wavelength converting particles that emit light within the range of 490 nm to 580 nm, And second wavelength conversion particles that emit light. The first wavelength conversion particle may be the green particle described above, and the second wavelength conversion particle may be the red particle described above.

The wavelength converting particles can be used without any particular limitation as long as they exhibit such action. Representative examples of such particles include, but are not limited to, nanostructures called so-called Quantum Dots.

Quantum dots that may be used in the present application may be formed using any suitable material, for example, an inorganic material, using an inorganic conducting or semi-conducting material. Suitable semiconductor materials include II-VI, III-V, IV-VI, and IV semiconductors. More specifically, it is possible to use Si, Ge, Sn, Se, Te, B, C (including diamond), P, BN, BP, BAs, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, ZnSe, ZnTe, CdS, CdSe, CdSeZn, CdTe, HgS, HgSe, HgTe, BeS, BeSe, BeTe, MgS, InS, InSb, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, ZnO, ZnS, 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 two or more of these semiconductors may be exemplified, but are not limited thereto.

The quantum dot may have, for example, a core-shell structure. Specifically, the quantum dots (core-shell) of the core-shell structure include CdSe-ZnS, InP-ZnS, PbSe-PbS, CdSe-CdS, CdTe-CdS or CdTe- But is not limited thereto.

Further, the wavelength conversion particles may be polymer particles composed of an organic material. The kind and size of the polymer particles made of the organic material can be used without limitation as disclosed in, for example, Korean Patent Laid-Open Publication No. 2014-0137676.

The wavelength converting particles can be produced in any known manner. For example, U.S. Patent No. 6,225,198, U.S. Patent Publication No. 2002-0066401, U.S. Patent No. 6,207,229, U.S. Patent No. 6,322,901, U.S. Patent No. 6,949,206, U.S. Patent No. 7,572,393, U.S. Patent No. 7,267,865, Patent No. 7,374,807 or U.S. Patent No. 6,861,155 discloses a method of forming quantum dots and the like, 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 can be appropriately selected in consideration of the desired light emission characteristics.

The wavelength converting particle may be one whose surface has been modified to include one or more ligands or barriers. The ligand or barrier may be advantageous to improve the stability of the wavelength converting particle and to protect the wavelength converting particle from harmful external conditions including high temperature, high intensity, external gas or moisture.

In addition, the ligand or barrier may serve to improve the dispersibility of the wavelength converting particles depending on the polarity of the host material forming the wavelength conversion layer.

In one example, the ligand or barrier may serve to impart hydrophilicity or hydrophobicity to the surface of the wavelength conversion particle so that the wavelength conversion particle is easily dispersed in a host material exhibiting hydrophilic or hydrophobic characteristics.

In a specific example, the wavelength converting particle may be a surface modified with a ligand.

Surface modification methods for forming ligand materials and ligands in the wavelength converting particles are well known, and such methods can be applied without limitation in the present application. Such materials and methods are disclosed, for example, in U.S. Patent Publication No. 2008-0281010, U.S. Patent Publication No. 2008-0237540, U.S. Patent Publication No. 2010-0110728, U.S. Patent Application No. 2008-0118755, U.S. Patent No. 7,645,397 U.S. Patent No. 7,374,807, U.S. Patent No. 6,949,206, U.S. Patent No. 7,572,393, U.S. Patent No. 7,267,875, and the like, but are not limited thereto. In one example, the ligand may be a molecule having an amine group (oleylamine, triethylamine, hexylamine, naphtylamine, etc.) or a polymer, a molecule having a carboxyl group (oleic acid or the like), a polymer having a thiol group (butanethiol, hexanethiol, dodecanethiol, etc.) A molecule having a phosphine group (e.g., triphenylphosphine), a molecule having an oxidized phosphine group (such as trioctylphosphine oxide), a molecule having a carbonyl group (such as alkyl ketone), a polymer having a benzene ring But are not limited to, molecules (benzene, styrene, etc.) or polymers, molecules having a hydroxyl group (butanol, hexanol, etc.), molecules having a polymer or sulfone group (such as sulfonic acid) or polymers.

The ratio of the wavelength converting particles in the wavelength conversion layer is not particularly limited, and may be selected in an appropriate range in consideration of, for example, desired optical characteristics.

In one example, the wavelength converting particles may be present in the wavelength conversion layer at a concentration of 0.05 wt% to 20 wt%, but are not limited thereto.

The wavelength conversion layer may further include particles such as scattering particles or plasmon particles, in addition to the above-mentioned wavelength converting particles, so that the luminous efficiency of the optical film can be increased.

In one example, the scattering particles included in the wavelength conversion layer can improve the optical characteristics of the wavelength conversion layer by controlling the probability that light incident on the wavelength conversion layer is introduced into the wavelength conversion particle.

The term " scattering particles " in the present application may refer to any kind of particles that have a refractive index different from that of the surrounding medium, for example, a light emitting layer, and that have an appropriate size and can scatter, refract, or diffuse the incident light have.

The scattering particles may have a mean particle size of, for example, 10 nm or more, 100 nm or more, 100 nm or more, 100 nm or 20,000 nm, 100 nm to 15,000 nm, 100 nm to 10,000 nm, 100 nm to 5,000 nm, nm or from 100 nm to 500 nm.

The scattering particle may have a shape such as a sphere, an ellipse, a polyhedron or an amorphous shape, but the shape is not particularly limited.

Examples of the scattering particles include organic materials such as polystyrene or a derivative thereof, an acrylic resin or a derivative thereof, a silicone resin or a derivative thereof, or a novolak resin or a derivative thereof, or an organic material such as silica, alumina, titanium oxide or zirconium oxide Particles including an inorganic material can be exemplified. The scattering particles may include only one of the above materials, or may be formed to include two or more of the above materials.

For example, as the scattering particles, hollow particles such as hollow silica or particles of a core-cell structure may be used.

The ratio of such scattering particles in the wavelength conversion layer is not particularly limited, and can be selected at a proper ratio, for example, in consideration of the path of light incident on the wavelength conversion layer.

In one example, the plasmon particles included in the wavelength conversion layer can be adopted and used without restriction as long as the particles can cause plasmon resonance.

The term " plasmon resonance " in the present application may mean surface electromagnetic waves generated by collective vibrations of electrons occurring on the surface of a metal thin film when light of a specific wavelength is incident on the metal thin film.

For example, the plasmon particle may be in the shape of a sphere, an ellipse, a cylinder, a square, a rectangle, a rod, a tube, a pyramid, a triangle, a plate or a flat surface model.

For example, the plasmonic particles may be particles of a core-shell structure having an insulator cell covering at least one metal particle core and a metal particle core.

The core of the plasmon particles may be made of, for example, an alloy containing Ag (silver), Au (gold), Cu (copper), Al (aluminum), Pt (platinum), or any of these metals as a main component And any one of the metals may be appropriately selected in consideration of the induction of the plasmon resonance phenomenon depending on the wavelength of the light source of the illumination device capable of emitting white light.

As the material of the insulator, an insulator such as SiO ₂ , Al ₂ O ₃ , MgO, ZrO ₂ , PbO, B ₂ O ₃ , CaO, or BaO may be used for the cell of the plasmon particle.

The wavelength conversion layer can be formed, for example, by forming a composition for forming a wavelength conversion layer by mixing a host material and a wavelength conversion particle, which are the main host, on a base layer using a known coating method, can do. The host material may be a polymeric resin or a radically polymerizable compound.

Therefore, the wavelength conversion layer may be formed of a polymer resin, for example, a silicone or epoxy polymer resin; Polyimide; Or polyamic acid, and the like.

In another example, the wavelength converting layer may comprise polymerized units of a radically polymerizable compound.

The radically polymerizable compound is a compound represented by any one of formulas (1) to (4); Compounds of formulas 5 to 7; Nitrogen-containing radically polymerizable compounds; And a radically polymerizable compound comprising a salt of (meth) acrylic acid or (meth) acrylic acid.

[Chemical Formula 1]

(2)

(3)

[Chemical Formula 4]

[Chemical Formula 5]

[Chemical Formula 6]

(7)

In formulas (1) to (4), Q ₁ is each independently hydrogen or an alkyl group,

U ₁ are each independently an alkylene group, A is each independently an alkyl with the hydroxyl group may be substituted with a group, Z is hydrogen, an alkoxy group, an group an epoxy group or a monovalent hydrocarbon group, X ₁ is a hydroxy group or a cyano group, m And n may be any number, for example, a positive integer.

In formulas (5) to (7), Q ₂ is each independently hydrogen or an alkyl group,

U ₂ are each independently an alkylene group, alkenylene group, alkynylene group or arylene group, B is a group having a carbon number of 5 or more linear or branched alkyl group or alicyclic hydrocarbon group, Y is an oxygen atom or a sulfur atom, X ₂ is An oxygen atom, a sulfur atom or an alkylene group, Ar is an aryl group, and n is an arbitrary number, for example, a positive integer.

The term "alkyl group" in the present application 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.

The term "alkylene group" in the present application 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. The alkylene group may optionally be substituted with one or more substituents.

The term " epoxy group " in the present application means, unless otherwise specified, a cyclic ether having three ring constituting atoms or a compound containing such a cyclic ether or a monovalent residue derived therefrom have. As the epoxy group, a glycidyl group, an epoxy alkyl group, a glycidoxyalkyl group or an alicyclic epoxy group can be exemplified. The alicyclic epoxy group may be a monovalent residue derived from a compound containing a structure containing an aliphatic hydrocarbon ring structure and having a 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, and for example, 3,4-epoxycyclohexylethyl group and the like can be exemplified.

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

The term " alkenylene group or alkynylene group " in the present application 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, Or an alkynylene group. The alkenylene group or alkynylene group may be straight-chain, branched-chain 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 mean a divalent moiety derived from a compound or derivative thereof containing 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.

The term " aryl group " in the present application may mean a monovalent residue derived from a compound or derivative containing a benzene ring or a structure in which two or more benzene rings are condensed or bonded, unless otherwise specified. 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 substituent which may optionally be substituted in the alkyl group, alkoxy group, alkylene group, epoxy group, monovalent hydrocarbon group, alkynylene group, arylene group or aryl group in the present application include halogen such as a hydroxyl group, chlorine or fluorine, An epoxy group such as a methyl group, an ethyl group, an ethyl group, a propyl group, an isopropyl group, an isopropyl group, an isopropyl group, a butyl group, an isopropyl group, It is not.

In the above formulas 1, 2, 4 and 7, m and n are arbitrary numbers and can be, for example, independently within the range of 1 to 20, 1 to 16, or 1 to 12, respectively.

Examples of the nitrogen-containing radical polymerizable compound include an amide group-containing radical polymerizing compound, an amino group-containing radical polymerizing compound, an imide group-containing radical polymerizing compound, or a cyano group-containing radical polymerizing compound Etc. may be used. Examples of the amide group-containing radical polymerizable compound include (meth) acrylamide or N, N-dimethyl (meth) acrylamide, N, (Meth) acrylamide, N, N'-methylenebis (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, Acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam or (meth) acryloylmorpholine. Examples of the amino group-containing radical polymerizable compound include aminoethyl (meth) acrylate, N-dimethylaminoethyl (meth) acrylate or N, N-dimethylaminopropyl (meth) acrylate. Examples of the imide group-containing radical polymerizable compound include N-isopropylmaleimide, N- Hexyl maleimide or itaconimide The like 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 the salt of (meth) acrylic acid, for example, a salt with an alkali metal such as lithium, sodium, and potassium or a salt with an alkaline earth metal such as magnesium, calcium, strontium, and barium is exemplified But is not limited thereto.

In one example, the wavelength converting particles may comprise two regions that are phase-separated from each other. The two regions that are phase-separated from each other may be, for example, regions formed by the hydrophilic polymerizable composition and the hydrophobic polymerizable composition, respectively.

It is to be noted that the term " phase separated regions " in the present application are distinguished from each other as regions formed by two regions that do not intermingle with each other, such as relatively hydrophobic regions and relatively hydrophilic regions And the like. Hereinafter, for convenience, any one of the two regions that are phase-separated in the wavelength conversion layer may be referred to as a first region, and the other region may be referred to as a second region.

The term " hydrophilic polymerizable composition " in this application means a composition comprising a hydrophilic radically polymerizable compound, and " hydrophobic polymerizable composition " may mean a composition comprising a hydrophobic radically polymerizable compound. In the present application, the criterion for distinguishing the hydrophilicity and hydrophobicity of the hydrophilic radical polymerizing compound from the hydrophobic radical polymerizing compound is that, for example, when the two compounds are relatively hydrophilic or hydrophobic and mixed with each other, Is not particularly limited so far as it can form a film. In one example, the distinction between hydrophilicity and hydrophobicity can be performed by a so-called solubility parameter.

In the present application, the "solubility parameter" means the solubility parameter of a homopolymer formed by polymerization of the corresponding radically polymerizable compound, and thereby, 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 a method 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). The hydrophobic radically polymerizable compound in the present application may mean a radically polymerizable compound having a solubility parameter of less than about 10 and the hydrophilic radically polymerizable compound means a radically polymerizable compound having a parameter of about 10 or more can do.

In one example, the first region comprises a polymerized unit of a radically polymerizable compound comprising a compound of Formulas (1) to (4), a nitrogen-containing radically polymerizable compound, (meth) acrylic acid or salt thereof .

The second region may contain a polymerized unit of a compound represented by any one of formulas (5) to (7) described above.

The optical film of the present application may further include a barrier layer.

In one example, the barrier layer may be located on one side of the wavelength conversion layer.

FIG. 1 is a schematic view of an optical film according to the present application. The optical film of the present application may include a barrier layer 100, a wavelength conversion layer 200, and a barrier polarizer 300 sequentially from the bottom .

As shown in Fig. 1, the optical film of the present application adopts a barrier polarizing layer which simultaneously secures both barrier property and polarizing property without a separate barrier layer on the wavelength conversion layer, thereby reducing the thickness of the optical film and simplifying the process And a low cost process can be achieved.

The barrier layer is a structure adopted to prevent the luminous efficiency of the optical film from being lowered due to the oxidation of the wavelength conversion particles by moisture or oxygen which may be introduced into the optical film.

The kind of the material forming the barrier layer is not particularly limited.

In one example, a material for forming the barrier layer may be a polymer or the like in consideration of its formation method, or may be a known material including a metal, an oxide of a metal, a nitride of a metal, an oxynitride of a metal, Material.

In one example, the barrier layer may be a deposition layer or a coating layer.

In particular, when the barrier layer is a deposition layer, the barrier layer may be formed of In, Sn, Pb, Au, Cu, Ag, Zr, Hf, Zn. A metal such as Al, Si, La, Ti or Ni, an oxide of the metal, a nitride of the metal, an oxynitride of the metal, or an oxide of the metal.

In addition, when the barrier layer is a coating layer, the barrier layer may include a polymer such as PET (poly (ethylene terephthalate)).

The optical film of the present application may further include a base layer.

In one example, the substrate layer may be positioned between the barrier polarizing plate and the wavelength converting layer.

FIG. 2 is a schematic view of an optical film according to the present application. The optical film of the present application includes a barrier layer 100, a wavelength conversion layer 200, a base layer 400, and a barrier polarizing plate 400 ).

The base layer of the present application serves as a support for the wavelength conversion layer and the barrier polarizing plate, and the material thereof may be, for example, a transparent substrate having light transmission properties.

In one example, the substrate layer may be a transparent substrate having a light transmittance of 80% or more or a light transmittance of 85% or more with respect to the entire wavelength within one or more wavelengths or visible light range within the visible light range as the transparent substance.

The substrate layer may be, for example, a transparent substrate having a haze of 10% or less or 5% or less.

The base layer may be, for example, one having a refractive index at 550 nm of 1.5 to 2.0 or 1.5 to 1.7.

The thickness of the base layer may be, for example, 30 탆 to 150 탆, or 40 탆 to 125 탆, but is not limited thereto.

Suitable materials for the substrate layer include, but are not limited to, cellulosic esters (e.g., cellulose triacetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate and nitrocellulose), polyimides, polycarbonates, polyesters such as polyethylene terephthalate, Naphthalate and polycyclohexane-1,4-dimethylene terephthalate), polystyrenes (e.g. syndiotactic polystyrene), polyolefins (e.g. polypropylene, polyethylene and polymethylpentene), polysulfone, polyethersulfone But is not limited to, at least one selected from the group consisting of polyacrylates, polyetherimides, polymethylmethacrylates, polyether ketones, polyvinyl alcohols and polyvinyl chlorides.

The optical film of the present application may further include glass to ensure excellent shielding properties against oxygen and the like.

In one example, the optical film of the present application comprises a barrier layer 100, a wavelength conversion layer 200, a base layer 400, a barrier polarizing plate 300, and a glass 500 sequentially, as shown in Fig. . &Lt; / RTI >

The present application is also directed to a lighting device. Exemplary lighting devices may include a light source and the optical film. In one example, the light source and the optical film in the illumination device may be arranged so that the light emitted from the light source is incident on the optical film. When the light irradiated from the light source is incident on the optical film, a part of the incident light is not absorbed by the wavelength converting particles in the optical film but is emitted as it is, while the other part is absorbed by the wavelength converting particle, Can be released.

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

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

Figs. 4 and 5 illustrate an illumination device including a light source and an optical film as described above.

As shown in Figs. 4 and 5, the light source and the optical film in the illuminating device can be arranged so that the light irradiated from the light source can be incident on the optical film. In FIG. 4, the light source 1000 is disposed below the optical film 2000, so that the light emitted from the light source 1000 in the upward direction can be incident on the optical film 2000.

5 shows a case where the light source 1000 is disposed on the side surface of the optical film 2000. Fig. When the light source 1000 is disposed on the side surface of the optical film 2000 as described above, light from the light source 1000, such as a light guiding plate 3000 or a reflection plate 4000, Other means for enabling the optical film 2000 to be efficiently incident can also be included.

The example shown in Figs. 4 and 5 is one example of the illumination apparatus of the present application, and the illumination apparatus may have various known configurations and may additionally include various known configurations for this purpose.

The illumination device of the present application as described above can be used for various applications. A typical application to which the illumination apparatus of the present application may be applied is a display apparatus. For example, the illumination device can be used as a BLU (Backlight Unit) of a display device such as an LCD (Liquid Crystal Display).

In addition, the lighting device may be a backlight unit (BLU) of a display device such as a computer, a mobile phone, a smart phone, a personal digital assistant (PDA), a gaming device, an electronic reading device or a digital camera, , Stage lighting, decorative lighting, accent lighting or museum lighting, etc. In addition, it may be used in horticulture, special wavelength lighting required in biology, etc., but the application to which the lighting device can be applied is not limited to the above.

100: barrier layer
200: wavelength conversion layer
300: Barrier polarizer
400: substrate layer
500: glass
1000: Light source
2000: Optical film
3000: light guide plate
4000: Reflector

Claims

A wavelength conversion layer including wavelength converting particles; And a barrier polarizing plate having an oxygen transmission rate (OTR) of 1 cc / m ² / day / atm or less at a temperature condition of 23 ° C and 0% relative humidity,
Wherein the barrier polarizer comprises a crosslinked polymer; And an oxygen absorbent which is vitamin E, vitamin C, tocopherol, squalane, fatty acid compound or polybutadiene.

The method according to claim 1,
The polymer may be selected from the group consisting of polyvinyl alcohol, nylon, polyvinyl chloride, polyvinyl fluoride, polyvinylidene chloride, polyacrylonitrile, ethylene vinyl alcohol copolymer, polycarboxylic acid, polyethyleneimine, ethylene vinyl acetate copolymer, polyolefin, polyester And at least one selected from the group consisting of polystyrene.

delete

The method according to claim 1,
The crosslinked polymer is crosslinked by at least one crosslinking agent selected from the group consisting of an inorganic acid, an aldehyde compound, a siloxane compound, a polyvalent carboxylic acid compound, and a polyfunctional isocyanate compound.

The method according to claim 1,
Wherein the barrier polarizing plate further comprises a water absorbing agent.

delete

The method according to claim 1,
Wherein the oxygen absorber further comprises a transition metal catalyst or ultraviolet sensitizer.

6. The method of claim 5,
Wherein the water absorbent is an oxide, a nitride, an oxynitride or a fluoride.

The method according to claim 1,
Wherein the thickness of the barrier polarizing plate is in the range of 0.1 to 100 占 퐉.

The method according to claim 1,
Wherein the wavelength converting particle is a quantum dot or a polymer particle of a core-shell structure.

The method according to claim 1,
The wavelength conversion layer may be formed of a compound represented by any of Formulas 1 to 4; Compounds of formulas 5 to 7; Nitrogen-containing radically polymerizable compounds; And a polymerized unit of a radically polymerizable compound selected from (meth) acrylic acid or a salt of (meth) acrylic acid:
[Chemical Formula 1]

(2)

(3)

[Chemical Formula 4]

[Chemical Formula 5]

[Chemical Formula 6]

(7)

In formulas (1) to (4), Q ₁ is each independently hydrogen or an alkyl group,
U ₁ is each independently an alkylene group,
A is independently an alkylene group in which the hydroxy group may be substituted,
Z is hydrogen, an alkoxy group, an epoxy group or a monovalent hydrocarbon group,
X ₁ is a hydroxy group or a cyano group,
m and n are any numbers:
In formulas (5) to (7), Q ₂ is each independently hydrogen or an alkyl group,
U ₂ each independently represents an alkylene group, an alkenylene group, an alkynylene group or an arylene group,
B is a linear or branched alkyl group having 5 or more carbon atoms or an alicyclic hydrocarbon group,
Y is an oxygen atom or a sulfur atom,
X ₂ is an oxygen atom, a sulfur atom or an alkylene group,
Ar is an aryl group,
n is an arbitrary number.

The method according to claim 1,
Further comprising a barrier layer.

14. The method of claim 13,
Wherein the barrier layer is located on the opposite side of the surface where the wavelength conversion layer is in contact with the base layer.

Light source; And
The lighting device according to claim 1, wherein the light source and the optical film are disposed so that light from the light source can be incident on the optical film.

16. The method of claim 15,
Wherein the light source emits light of a wavelength in the range of 420 nm to 490 nm.

A display device comprising the illumination device of claim 15.