KR20170075478A

KR20170075478A - A wavelength conversion particle complex and Optical film comprising it

Info

Publication number: KR20170075478A
Application number: KR1020150185180A
Authority: KR
Inventors: 권태균; 유수영; 이성민; 박문수
Original assignee: 주식회사 엘지화학
Priority date: 2015-12-23
Filing date: 2015-12-23
Publication date: 2017-07-03
Also published as: KR102034463B1

Abstract

The present invention relates to a composite, a composition for an optical film containing the same, an optical film, a manufacturing method and a use thereof.
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 stably maintain such excellent properties for a long period of time. The optical film of the present application can be used for various applications including various lighting devices as well as photovoltaic applications, optical filters or optical converters.

Description

[0001] The present invention relates to a wavelength conversion particle composite and an optical film comprising the same,

The present invention relates to a wavelength conversion particle composite, a composition for an optical film comprising the complex, an optical film, and uses thereof.

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. In particular, studies have been actively carried out to increase the wavelength conversion efficiency of the quantum dots by reducing the efficiency of the quantum dots when the quantum dots are exposed to gases such as oxygen.

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

The present application relates to a wavelength conversion particle composite in which, for example, a wavelength conversion particle and a plasmon particle are formed into a single complex to improve the wavelength conversion efficiency and to provide an optical film having excellent optical characteristics, and an optical film Lt; / RTI >

The present application also provides an optical film excellent in physical properties, such as adhesiveness with other layers, durability, or optical characteristics, and the like, through the phase separation of the wavelength converting layer, and a method for producing the optical film.

The present application is conceived to solve the above-mentioned problems, and includes a wavelength converting particle; Plasmon particles; And a ligand for binding the wavelength converting particles and the plasmon particles.

In one example, the ligand of the complex comprises a first ligand bonded to the surface of the wavelength converting particle and a second ligand bonded to the surface of the plasmon particle, wherein the first ligand and the second ligand are mutually bonded There may be something.

The mutual bond between the first ligand and the second ligand may be a hydrogen bond or a hydrophobic interaction.

The present application also relates to a composition for an optical film comprising the above composite. The composition for an optical film includes a polymer resin or a complex with a first radically polymerizable compound.

In another example, the composition for an optical film may further comprise a first radically polymerizable compound and a second radically polymerizable compound phase-separated after polymerization.

The present application is also directed to an optical film having a wavelength conversion layer comprising the composite.

In one example, the wavelength conversion layer of the optical film is a continuous phase matrix; And an emulsion region dispersed in the matrix, wherein the complex may be located in the matrix or emulsion region.

The present application also relates to a method of making a composite comprising the step of mixing the surface-modified, wavelength-converted particles with a ligand and the surface modified plasmon particles with a ligand.

The present application also relates to a method for producing an optical film comprising the step of mixing a plasmon particle surface-modified with a ligand and a wavelength-converted particle surface-modified with a ligand, with a radical polymerizing compound.

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

The present application can provide a wavelength conversion particle composite that can be included in an illumination device having a constant optical property, for example, a light emission intensity and improved wavelength conversion efficiency, by using a plasmon resonance phenomenon.

In addition, the present application can provide an optical film excellent in physical properties such as adhesiveness with other layers, durability, or optical characteristics, etc., through phase separation of the wavelength conversion layer.

Figures 1 and 2 are schematic diagrams of a composite comprising wavelength converting particles and plasmon particles.
3 is a schematic diagram of a quantum dot of an exemplary Core-shell structure.
4 is an exemplary view of an optical film.
Figures 5 and 6 are schematic diagrams of an exemplary lighting device.
Fig. 7 shows the evaluation of the luminous efficiency of the optical films according to Examples and Comparative Examples.

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 will be understood by those skilled in the art that this application is not limited to the process conditions set forth in the following examples, but may be optionally selected within the scope of the conditions necessary to accomplish the object of the present application Do.

The present application relates to a complex comprising a wavelength converting particle, a plasmon particle and a ligand. The ligand can bind the wavelength converting particles and the plasmon particles.

The term " wavelength converting 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 term " plasmon particle " in the present application may mean a particle capable of causing 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.

That is, the composite of the present application includes a ligand that binds the wavelength converting particles and the plasmon particles so that the wavelength converting particles and the plasmon particles can maintain a certain distance, so that the wavelength due to the surface electromagnetic wave generated by the plasmon resonance phenomenon The excitation of the converted particles is facilitated, the wavelength conversion efficiency of the optical film is increased, and the emission intensity can be kept constant.

The length of the ligand for coupling the wavelength conversion particles and the plasmon particles is determined by the generation of surface electromagnetic waves due to the plasmon resonance phenomenon described above and the generated surface electromagnetic waves by excitation of the wavelength conversion particles and ultimately, There is no limit to the distance that can increase the strength. For example, the length of the ligand may be from 100 to 1,000 nm.

In another example, the length of the ligand may be in the range of 200 to 800 nm or 300 to 700 nm.

The ligand for binding the wavelength converting particles and the plasmon particles may be included in the complex in an unlimited form to the extent that the above objects can be achieved.

In one example, the ligand of the complex may be in a state of containing at least one ligand at both ends which can be bonded to the surface of the wavelength converting particle and the plasmon particle.

In another example, the ligand contained in the complex may comprise a first ligand bonded to the surface of the wavelength converting particle and a second ligand bonded to the surface of the plasmon particle. In addition, the first ligand and the second ligand may be mutually coupled.

Specifically, as shown in Fig. 1, the complex of the present application comprises the wavelength converting particle 100 having the first ligand 101 and the plasmon particle 200 having the second ligand 201, 1 ligand 101 and the second ligand 201 may be mutually bonded. The first ligand and the second ligand that are mutually bonded may be the same kind or may be different kinds of ligands.

For example, the first ligand and the second ligand may be independently selected from molecules having an amine group (oleylamine, triethylamine, hexylamine, naphtylamine, etc.) or polymers, molecules having a carboxyl group (oleic acid or the like) (triphenylphosphine, etc.), a molecule having a phosphine group (trioctylphosphine oxide, etc.), a molecule having a carbonyl group (e.g., butanethiol, hexanethiol, dodecanethiol, etc.) or a molecule having a pyridine group alkyl ketone, etc.), molecules capable of binding to each other among molecules having a benzene ring (benzene, styrene, etc.) or polymers, molecules having a hydroxyl group (butanol, hexanol, etc.), polymers, Or the polymer can be appropriately selected.

The first ligand and the second ligand may be linked to each other. The mutual bond may be a chemical bond such as a physical bond such as a hydrogen bond or a hydrophobic interaction.

The complexes of the present application may comprise wavelength converting particles. As described above, the wavelength converting particles may mean particles formed by absorbing light of a predetermined wavelength and emitting light having the same or different wavelengths as the absorbed light.

The size of the wavelength converting particle is, for example, 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, 15 nm or less, and the size of the particles may be different depending on the light of the wavelength to be emitted.

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

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. ) Or a particle 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 580 to 780 nm (hereinafter referred to as red particles).

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

2, the complex of the present application includes the wavelength converting particle 100 having the first ligand 101 and the plasmon particle 200 having the second ligand 201, The particles may be green particles and / or red particles, and may form a complex of plasmon particles and clusters via ligands.

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 a core-shell structure. As shown in FIG. 3, the core-shell structure may include a core portion 300 indicating a central portion of a quantum dot, and a cell portion 400 surrounding the core portion 300. have.

Exemplary core-cell wavelength conversion particles (cores / cells) applicable in the present application include, but are not limited to, CdSe / ZnS, InP / ZnS, PbSe / PbS, CdSe / CdS, CdTe / CdS or CdTe / It is not.

When the quantum dot has a core-shell sturucture, the cell portion may be formed so as to be capable of binding with the end of the above-mentioned ligand. Further, the cell portion may be formed such that the first ligand described above can be bonded to the surface of the quantum dot.

In one example, the cell portion of the quantum dot may include a first cell portion immediately surrounding the core and a second cell portion surrounding the first cell portion, and the second cell portion may be formed to be able to engage with the terminal end of the ligand Or the first ligand may be formed so as to be bonded to the surface of the quantum dot.

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. When the wavelength converting particle is a polymer particle of an organic material, the surface of the polymer particle may be formed so as to be capable of bonding with the above-mentioned ligand.

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. The ligand or barrier included in the wavelength converting particle is combined with the ligand formed on the surface of the plasmon particle to keep the distance between the wavelength converting particle and the plasmon particle constant so that the wavelength caused by the electromagnetic wave generated by the plasmon resonance phenomenon Excitation of the converted particles can be further facilitated.

In one example, the wavelength converting particles may be surface-modified with a ligand.

As described above, the ligand formed through the surface modification of the wavelength converting particles can exhibit properties suitable for the surface of the wavelength converting particle, and can be combined with the ligand formed on the surface of the plasmon particle to increase the wavelength conversion efficiency The method of formation is known, and such a method 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 (Such as benzene, styrene, etc.) or a polymer, a molecule having a hydroxyl group (butanol, hexanol, etc.) or a molecule having a polymer or sulfone group (such as a sulfonic acid) or a polymer. Any one of the above-mentioned molecules or polymers can be appropriately selected in consideration of the binding ability with the ligand formed on the substrate.

The complexes of the present application may comprise plasmon particles. The plasmon particle may mean a particle capable of causing plasmon resonance as described above. Plasmon particles improve the wavelength conversion efficiency by using a principle different from scattering particles or the like which can be added to improve the wavelength conversion efficiency described later, that is, plasmon resonance phenomenon.

As described above, the plasmon particle can be adopted and used without restriction if it is a particle capable of causing plasmon resonance.

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, insulators such as SiO ₂ , Al ₂ O ₃ , MgO, ZrO ₂ , PbO, B ₂ O ₃ , CaO, and BaO may be used for the cells of the plasmon particles.

When the plasmon particles are particles of a core-shell structure, the cell portion may be formed so that the ends of the above-mentioned ligands can be bonded. Further, the cell portion may be formed so that the above-mentioned second ligand can be bonded to the surface of the plasmon particle.

The size of the plasmon particle is not limited as long as the particle induces a plasmon resonance phenomenon and can increase the wavelength conversion efficiency of the wavelength conversion particle. For example, the size of the plasmon particle can be a nano-sized particle. The nano-sized plasmon particles can be, for example, spherical particles having a diameter in the range of 10 nm to 200 nm or 20 nm to 100 nm, but are not limited thereto.

In one example, the surface of the plasmon particles may be surface modified to include one or more ligands. The ligand binds with a ligand contained in the wavelength conversion particle such as a quantum dot to maintain a constant distance between the plasmon particle and the wavelength conversion particle, and thereby the exciton of the wavelength conversion particle caused by the electromagnetic wave excitation < / RTI >

A method of forming a ligand on the surface of the plasmon particle is known, and the kind of the ligand can be appropriately selected in consideration of the kind of the ligand that can be included in the above-mentioned wavelength conversion particle. 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 (Such as benzene, styrene, etc.) or a polymer, a molecule having a hydroxyl group (such as butanol or hexanol), a polymer or a molecule having a sulfone group (such as a sulfonic acid), or a polymer. Any one of the above-mentioned molecules or polymers can be appropriately selected in consideration of the binding ability with the formed ligand.

The present application also relates to a composition for an optical film comprising such a composite.

The term " optical film " in the present application may refer to a film used in an optical apparatus for various purposes. 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 composition for an optical film of the present application has a composite containing the wavelength converting particles and the plasmon particles in a state of being held close to each other via a ligand, thereby maximizing the plasmon resonance phenomenon and ultimately improving the wavelength conversion efficiency Lt; / RTI >

The composition for an optical film of the present application may also contain other components that can adversely affect the wavelength conversion particles by mainly including a complex in any one of two regions that can be separated from each other that can be formed by polymerization of the composition Can be effectively controlled.

The composition for an optical film of the present application comprises a polymer resin or a first radically polymerizable compound; And complexes. Further, the composite may include a wavelength converting particle; Plasmon particles; And a ligand for binding the wavelength converting particles and the plasmon particles.

The polymer resin or the first radically polymerizable compound is a main component for forming a wavelength conversion layer formed from the composition, and a proper type can be selected in consideration of the compatibility with the composite and the particle dispersibility. have.

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

Thus, a resin having a solubility parameter of less than 10 (cal / cm < ³ >) ^1/2 can be referred to as a hydrophobic polymer resin. The manner of obtaining the solubility parameter is not particularly limited and may be in accordance with 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).

When a hydrophobic polymer resin is used as the polymer resin, it is possible to appropriately secure the wavelength conversion particles and the dispersibility of the complex, and can be effective in achieving the desired wavelength conversion efficiency.

The kind of the polymer resin has the aforementioned solubility parameter range, and examples thereof include acrylic resin, silicone resin, hydrocarbon polymer or urethane resin, but are not limited thereto.

In one example, the polymeric resin is selected from the group consisting of polybutadiene, polyisobutylene, polyethylene, polypropylene, poly (1-decene), polystyrene, 1-octadecene, 1-nonadecene, cis- 1-hexadecene, 1-pentadecene, 1-tetradecene, 1-tridecene, 1-undecene or 1-dodecene. When the hydrocarbon polymer is used as the hydrophobic polymer resin, the dispersibility of the wavelength particles and the stability under high temperature and high humidity conditions can be effectively secured.

The composition for an optical film may include a first radically polymerizable compound.

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

In one example, the first radically polymerizable compound may have a solubility parameter of less than 10 (cal / cm ³ ) ^1/2 of the single polymer. That is, the first radically polymerizable compound may be a hydrophobic polymerizable compound. When the hydrophobic polymerizable compound is polymerized to form the wavelength conversion layer, dispersion and stability of the wavelength conversion particle and the complex can be achieved. In another example, the first solubility parameter of the radical polymerizable compound is, ³ (cal / cm 3) over ^{1/2, 4 (cal / cm 3} ) 1/2 or more, or about 5 (cal / cm ³⁾ ^1/2 Or more.

The first radically polymerizable compound may be any one selected from the group consisting of a compound represented by the following general formula (1), a compound represented by the following general formula (2) and a compound represented by the following general formula (3) .

[Chemical Formula 1]

(2)

(3)

In formulas (1) to (3), Q is independently hydrogen or an alkyl group, U is independently an alkylene group, an alkenylene group or 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 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 an arbitrary number.

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 " 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 range of the aryl group may include a so-called aralkyl group or an arylalkyl group as well as a functional group ordinarily called an aryl 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 a phenyl group, a phenoxy group, a phenoxyphenyl group, a phenoxybenzyl group, a dichlorophenyl group, a chlorophenyl group, a phenylethyl group, a phenylpropyl group, a benzyl group, a tolyl group, a xylyl group, . In addition, the aryl group may be optionally substituted with one or more substituents.

Examples of the substituent which may optionally be substituted in the alkyl group, alkylene group, alkenylene group, alkynylene group, arylene group or aryl group in the present application include halogen, alkyl group or aryloxy group such as hydroxyl group, But is not limited thereto.

In one example, Q in the general formula (1) is hydrogen or an alkyl group, and B may be a linear or branched alkyl group having 5 or more carbon atoms or an alicyclic hydrocarbon group.

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

In another embodiment, B may be 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 groups include cyclohexyl group or iso Boronyl group and the like can be exemplified. The compound having an alicyclic hydrocarbon group is known as a relatively nonpolar compound.

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

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

The composition for an optical film of the present application may further comprise a second radically polymerizable compound and a second radically polymerizable compound phase-separated after polymerization.

When an optical film is formed from a composition containing two compounds phase-separated after polymerization as described above, and the wavelength converting particles are positioned only in a region in which any one of the two compounds is polymerized, Other factors that may adversely affect the physical properties of the wavelength converting particles such as an initiator and a crosslinking agent can be more effectively controlled to provide an optical film having excellent durability.

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

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

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

The term " phase-separated " means that when the composition for an optical film is to be formed into a wavelength conversion layer through a polymerization process and the like which will be described later, regions that are phase separated in the wavelength conversion layer, And a relatively hydrophilic region are separated from each other, as shown in Fig.

In one example, the second radically polymerizable compound may have a solubility parameter of the single polymer of 10 (cal / cm < ³ >) ^1/2 or more. The solubility parameter of the second radical-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 than 15 (cal / cm ³⁾ may be equal to or greater than ^1/2. The solubility parameter of the radical polymerizable compound is from about 40 (cal / cm ³⁾ ^1/2 or less, about 35 (cal / cm ³⁾ ^1/2 or less, or about 30 (cal / cm ³⁾ ^1/2 or less in another example .

In a specific example, the second radically polymerizable compound is a compound represented by the following general formula (4): A compound of formula 5; A compound of the formula 6 below; A compound of formula (7); Nitrogen-containing radically polymerizable compounds; And a radically polymerizable compound containing (meth) acrylic acid or a salt thereof.

[Chemical Formula 4]

[Chemical Formula 5]

[Chemical Formula 6]

(7)

In the general formulas (4) to (7), Q is independently hydrogen or an alkyl group, U is independently an alkylene group, A is independently an alkylene group in which a hydroxyl group may be substituted, and Z is a hydrogen, an alkoxy group, A hydrocarbon group, X is a hydroxyl group or a cyano group, and m and n are arbitrary numbers.

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.

In the present application, examples of the substituent which may optionally be substituted in the epoxy group, alkoxy group or monovalent hydrocarbon group include a hydroxy group; Halogen such as chlorine or fluorine; An epoxy group such as a glycidyl group, an epoxy alkyl group, a glycidoxyalkyl group or an alicyclic epoxy group; Acryloyl group; A methacryloyl group; Isocyanate group; Thiol group; An aryloxy group; Or a monovalent hydrocarbon group, but the present invention is not limited thereto.

In the formulas (4), (5) and (6), m and n are arbitrary numbers and can be, for example, independently in the range of 1 to 20, 1 to 16 or 1 to 12.

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.

Examples of salts of (meth) acrylic acid include salts with alkali metals such as (meth) acrylic acid and lithium, sodium and potassium or salts with alkaline earth metals such as magnesium, calcium, strontium and barium May be exemplified, but is not limited thereto.

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

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

In one example of the difference between the first radical-polymerizable compound and a second solubility parameter of the radical polymerizable compound is 5 (cal / cm ³⁾ ^1/2 or more, 6 (cal / cm ³⁾ ^1/2 or more, 7 ( cal / cm ³⁾ ^1/2 or at least about 8 (cal / cm ³⁾ may be ^1/2 or more. The difference is a value obtained by subtracting a small value from a large value among the solubility parameters. The upper limit of the difference is not particularly limited. The larger the difference in the solubility parameter, the more appropriate phase separation structure can be formed. The upper limit of the difference may be, for example, 30 (cal / cm ³ ) ^1/2 or less, 25 (cal / cm ³ ) ^1/2 or less, or about 20 (cal / cm ³ ) ^1/2 or less.

When the first radically polymerizable compound and the second radically polymerizable compound are incorporated into the composition together with the wavelength conversion particles, the wavelength conversion layer formed from such a composition is phase separated after polymerization to form respective regions, and the wavelength conversion particles Can be located in the region formed by the first radical polymerizing compound or in the region formed by the second radical polymerizing compound to achieve the desired dispersibility and stability of the wavelength converting particles.

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

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

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

The complex contained in the composition for an optical film of the present application may be a wavelength converting particle; Plasmon particles; And a ligand for binding the wavelength converting particles and the plasmon particles.

In one example, the complex may be contained in a hydrophilic region or a hydrophobic region formed by polymerizing a composition for an optical film of the present application.

Specifically, the composite may be contained in the hydrophobic region formed by polymerization of the composition for optical film of the present application, and may not be substantially contained in the hydrophilic region.

The fact that the composite is not substantially contained in the present application means that the weight ratio of the composite contained in the region is, for example, 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% or less.

The proportion of the composite in the composition for an optical film is not particularly limited, and may be selected in an appropriate range in consideration of, for example, desired optical characteristics.

The complex may be included in the composition in a proportion of, for example, 0.05 to 35 parts by weight, 0.05 to 25 parts by weight or 0.05 to 15 parts by weight, 0.1 to 15 parts by weight, or 0.5 to 15 parts by weight, relative to 100 parts by weight of the solid content of the composition, But is not limited thereto.

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

The kind of the radical initiator contained in the composition for an optical film of the present application is not particularly limited. As the initiator, a radical thermal initiator or a photo initiator capable of generating radicals to induce polymerization reaction by application of heat or irradiation of light can be used.

Examples of the thermal initiator include 2,2-azobis-2,4-dimethylvaleronitrile (V-65, Wako), 2,2-azobisisobutyronitrile (V- Azo type initiators such as 2,2-azobis-2-methylbutyronitrile (V-59, Wako); (Peroyl NPP, NOF), diisopropyl peroxydicarbonate (Peroyl IPP, NOF), bis-4-butylcyclohexyl peroxydicarbonate (Peroyl TCP, NOF (Peroyl EEP, NOF), diethoxyhexyl peroxydicarbonate (peroyl OPP, NOF), hexyl peroxydicarbonate (Perhexyl ND, NOF), diethoxyethyl peroxydicarbonate ), Dimethoxybutylperoxy dicarbonate (Peroyl MBP, NOF), bis (3-methoxy-3-methoxybutyl) peroxy dicarbonate (Peroyl SOP, NOF), hexyl peroxypivalate (Perflux, NOF), trimethylhexanoyl peroxide (Peroyl 355, NOF), amyl peroxypivalate (Luperox 546M75, Atofina), butyl peroxypivalate (Peroxy compound); (Luperox 610M75, Atofina), amyl peroxyneodecanoate (Luperox 546M75, Atofina) or butyl peroxyneodecanoate (Luperox 10M75, available from Atofina Peroxy dicarbonate compounds such as a)); Acyl peroxides such as 3,5,5-trimethylhexanoyl peroxide or dibenzoyl peroxide; Ketone peroxide; Dialkyl peroxides; Peroxyketals; Or peroxide initiators such as hydroperoxide and the like, or a mixture of two or more thereof.

As the photoinitiator, benzoin-based, hydroxy ketone-based, aminoketone-based or phosphine oxide-based photoinitiators can be used. Specific examples thereof include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy 2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone , p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methyl anthraquinone, 2-ethyl anthraquinone, 2- Thioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethylketal, acetophenone dimethylketal, p- Ester, ol Methyl-2-methyl-1- [4- (1-methylvinyl) phenyl] propanone] and 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide can be used. But is not limited to.

In the composition for an optical film of the present application, those having high solubility in the hydrophilic or hydrophobic component in the initiator can be appropriately selected and used.

The content of the initiator in the composition for an optical film of the present application is not particularly limited. For example, the initiator may be included in the composition for an optical film in an amount of 0.1% by weight to 15% by weight based on the total weight of the composition for an optical film, It is not.

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

As the compound which can be used as a crosslinking agent, a polyfunctional acrylate can be exemplified. The polyfunctional acrylate may mean a compound containing 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, polyethylene glycol di (Meth) acrylate, neopentylglycol adipate di (meth) acrylate, hydroxyl puivalic acid neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) Acrylate, caprolactone modified dicyclopentenyl di (meth) acrylate, ethylene oxide modified di (meth) acrylate, di (meth) acryloxy ethyl isocyanurate, allyl cyclohexyl di ) Acrylate, tricyclodecane dimethanol (meth) acrylate, dimethylol dicyclopentanedi (meth) acrylate, ethylene oxide modified hexahydrophthalic acid di (meth) acrylate, tricyclo (Meth) acrylate, neopentyl glycol-modified trimethylpropane di (meth) acrylate, adamantane di (meth) acrylate or 9,9-bis [4- Ethoxy) phenyl] fluorene and the like; (Meth) acrylates such as trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri Trifunctional acrylates such as modified trimethylolpropane tri (meth) acrylate, trifunctional urethane (meth) acrylate or tris (meth) acryloxyethylisocyanurate; Tetrafunctional acrylates such as diglycerin tetra (meth) acrylate or pentaerythritol tetra (meth) acrylate; Pentafunctional 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 (e.g., an isocyanate monomer and trimethylolpropane tri Hexafunctional acrylates such as a reaction product) can be used. As the polyfunctional acrylate, urethane acrylate, epoxy acrylate, polyester acrylate or polyether acrylate can also be used as a compound called so-called photocurable oligomer in the industry. Of these compounds, one or more suitable types may be selected and used.

As the crosslinking agent, crosslinking agents such as the above-mentioned polyfunctional acrylates can be crosslinked by a thermal curing reaction such as known isocyanate crosslinking agents, epoxy crosslinking agents, aziridine crosslinking agents or metal chelate crosslinking agents, A component capable of implementing the structure may also be used.

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

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

For example, the composition for an optical film of the present application may further include amphipathic nanoparticles.

The term " amphiphilic nanoparticle " in the present application may mean nano-sized particles that include both hydrophilic and hydrophobic properties, and may, for example, be referred to in the so-called industry as surfactants have.

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

The composition for an optical film may also include scattering particles. The scattering particles included in the wavelength conversion layer can improve the optical characteristics of the wavelength conversion layer, which will be described later, by controlling the probability that light incident on the wavelength conversion layer is introduced into the wavelength conversion particle.

The term " scattering particle " in the present application is intended to encompass all types of scattering particles having refractive indices different from those of the surrounding medium, for example, the matrix or emulsion region described below, and having an appropriate size and capable of scattering, Particles. &Lt; / RTI >

The scattering particles may have a mean particle diameter of, for example, 100 nm or more, 100 nm or more, 100 nm to 20,000 nm, 100 nm to 15,000 nm, 100 nm to 10,000 nm, 100 nm to 5,000 nm, 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 an appropriate ratio in consideration of the path of light incident on the wavelength conversion layer, for example.

The proportion of the scattering particles in the composition for an optical film of the present application may be, for example, in the range of 1 to 20% by weight based on the total weight of the solid content of the composition for an optical film, but is not limited thereto. The above range can be appropriately modified in consideration of the improvement aspect of the above.

The composition for an optical film may further include, in addition to the above-mentioned components, additives such as an oxygen scavenger, a radical scavenger or an antioxidant in necessary amounts.

The present application is also directed to optical films.

The optical film of the present application may comprise a complex comprising a wavelength converting particle, a plasmon particle and a ligand for binding the wavelength converting particle and the plasmon particle, and such a complex is contained in the wavelength conversion layer.

That is, the optical film of the present application includes a wavelength conversion layer, and the wavelength conversion layer includes the above-mentioned wavelength conversion particle, plasmon particle, and a complex comprising the ligand for binding the wavelength conversion particle and the plasmon particle.

The term " wavelength conversion layer " in the present application may mean a layer formed so as to absorb light from a light source and emit light of the same or different wavelength as the light from the light source.

The wavelength conversion layer may be formed from the above composition for an optical film. When the composition for an optical film further contains a first radically polymerizable compound as well as a second radically polymerizable compound, A separate structure can be implemented.

In one example, the wavelength conversion layer may comprise two regions that are phase separated from each other. The term " phase separated regions " in the present application confirms that they are separated from each other as regions formed by two regions that do not intermingle with each other, such as regions that are relatively hydrophobic and regions that are relatively hydrophilic And the like.

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 one example, the first region among the first region and the second region of the wavelength conversion layer may be a hydrophilic region, and the second region may be a hydrophobic region. In the present application, the hydrophilicity and the hydrophobicity for distinguishing the first and second regions are relative to each other, and an absolute criterion of hydrophilicity and hydrophobicity is that the two regions in the wavelength conversion layer are distinguishable from each other And is not particularly limited.

The first region and the second region may be distributed randomly to form a cluster to confirm that the two regions are divided in the wavelength conversion layer.

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

The term " emulsion type layer " in this application means that any one of two or more phases (for example, the first and second regions) that are not intermixed with each other is a continuous phase ), And the other region may be a layer having a dispersed phase dispersed in the continuous phase. The continuous phase and the dispersed phase may be solid phase, semi-solid phase or liquid phase, respectively, and may be the same phase or different phase. Emulsions are commonly used for two or more liquid phases that do not intermingle with each other, but the term emulsion in this application does not necessarily mean only the emulsion formed by two or more liquid phases.

In one example, the wavelength converting layer may comprise a matrix forming the continuous phase and an emulsion region being a dispersed phase dispersed within the matrix, and the complex may comprise an emulsion region dispersed in the matrix or emulsion region Can be located.

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

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

The complex contained in the emulsion region may be, for example, at least 90 wt%, at least 91 wt%, at least 92 wt%, at least 93 wt%, at least 94 wt%, at least 95 wt% , 96 wt% or more, 97 wt% or more, 98 wt% or more, 99 wt% or more, 99.5 wt% or more, or 99.9 wt% or more.

It is possible to secure physical properties suitable for film formation by forming two regions phase-separated in the wavelength conversion layer and substantially positioning the complex in only one of the two regions, specifically in the emulsion region, It is advantageous to secure the adhesion between the other layer such as the barrier layer and the wavelength conversion layer, and it is preferable that the wavelength conversion layer is provided with a protective layer on the other surface of the wavelength conversion layer, such as an initiator or a crosslinking agent, It is possible to control the factors more effectively and to form a film having excellent durability.

Specific types and physical properties of the wavelength converting particles, plasmon particles and composites constituting the composite are as described above.

The matrix or emulsion region included in the wavelength converting layer of the optical film may be formed by polymerization of the first radical polymerizing compound or the second radical polymerizing compound described above.

In one example, either the matrix or the emulsion region included in the wavelength converting layer may comprise the polymerization unit of the first radically polymerizable compound and the other may comprise the polymerization unit of the second radically polymerizable compound.

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

In one example, the matrix included in the wavelength converting layer is a compound of the above-mentioned formulas 4 to 7; Nitrogen-containing radically polymerizable compounds; And a radically polymerizable compound comprising (meth) acrylic acid or a salt thereof.

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

In one example, the emulsion region may be in the form of particles having an average diameter in the range of 1 占 퐉 to 200 占 퐉. In another example, the emulsion region may be in the form of particles having an average diameter in the range of about 1 [mu] m to 50 [mu] m or in the range of about 50 [mu] m to 200 [ The size of the particle shape can be controlled by controlling the ratio of the material forming the matrix and the emulsion region, or by using a surfactant or the like.

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

The emulsion region may comprise, for example, a complex, wherein the wavelength converting particles of the complex contained in the emulsion region may be the green and / or red particles described above.

In one example, the wavelength converting particles in the emulsion region may simultaneously contain green and red particles, where each particle may be located in a different region of the emulsion region.

Specifically, the emulsion region absorbs light in the range of 420 nm to 490 nm and can emit light in the range of 490 nm to 580 nm. The A region having the first complex containing the first wavelength converting particle and / or the A region having the wavelength range of 420 nm to 490 nm And a second complex comprising second wavelength conversion particles capable of absorbing light within the range of 580 nm to 780 nm and emitting light within the range of 580 nm to 780 nm.

When the first and second complexes having two kinds of wavelength conversion particles, such as green particles and red particles, are contained in the emulsion region as described above, by controlling the regions where the complexes are located, So that the color purity and the like can be increased.

The ratio of the matrix and the emulsion region in the wavelength converting layer is. For example, the ratio of the wavelength conversion particles to be included in the wavelength conversion layer, the adhesion with other layers such as the barrier layer, the production efficiency of the emulsion structure as the phase separation structure, or the physical properties required for film formation may be selected . For example, the wavelength conversion layer may comprise from 5 to 40 parts by weight of the emulsion region relative to 100 parts by weight of the matrix. The ratio of the emulsion region may be 10 parts by weight or more or 15 parts by weight or more based on 100 parts by weight of the matrix. The ratio of the emulsion region may be 35 parts by weight or less based on 100 parts by weight of the matrix. The ratio of the weight of the matrix and the emulsion region in the above is the ratio of the weight of each region itself or the sum of the weights of all the components contained in the region or the ratio of the main component or the weight of the material used for forming each of the regions It can mean the ratio.

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

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

Fig. 4 shows a structure including a wavelength conversion layer 500 and a barrier layer 600 disposed on both sides thereof as one exemplary optical film. The barrier layer may be formed of a material having good stability, for example, hydrophobic and free from yellowing even when exposed to light. In one example, in order to reduce the loss of light at the interface between the wavelength conversion layer and the barrier layer, the barrier layer may be selected so as to have a refractive index generally in a range similar to that of the wavelength conversion layer.

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

The barrier layer may be present on both surfaces of the wavelength conversion layer, or may exist only on either surface thereof, as exemplified in Fig. Further, the optical film may have a structure in which a barrier layer exists on both sides as well as both sides, and the wavelength conversion layer is entirely sealed by the barrier layer.

The present application also relates to a process for producing the above-described complexes.

In one example, the present application may be directed to a method of making a composite comprising including the step of mixing the surface-modified, wavelength-converted particle with a ligand and the surface modified particle with a ligand. When the wavelength converting particles and the plasmon particles that have been surface-modified with the ligand are mixed as described above, the wavelength converting particles and the plasmon particles may be in a state of being kept at a certain distance by being coupled through the ligand.

The wavelength conversion particle, the kind of plasmon particle and the structure of the ligand that can be used in the method for producing the complex can include all the contents described in the above-mentioned complex without limitation, a method for modifying the surface of the wavelength converting particle and the plasmon particle, It is a notice.

Specifically, in the composite according to the present application, when the wavelength converting particles and the plasmon particles surface-modified with the ligand are mixed with the radical polymerizing compound, the ligands contained in the surface of the wavelength converting particles and the plasmon particles are mutually bonded, Or may be formed by chemical bonding such as physical bonding such as hydrogen bonding or hydrophobic interaction.

The present application may also include the step of mixing an optical film, such as a composite, with a polymeric resin or a radically polymerizable compound. The composite is prepared by mixing, for example, wavelength conversion particles surface-modified with a ligand and plasmon particles surface-modified with a ligand, and the wavelength conversion particle; Plasmon particles, and a ligand which binds the wavelength converting particles and the plasmon particles.

By simply mixing the composite with the polymer resin or the radical polymerizable composition as described above, the optical film containing excellent optical properties can be produced by incorporating the composite into the wavelength conversion layer.

In one example, the radically polymerizable composition can be a composition comprising a first radically polymerizable compound and a second radically polymerizable compound.

When the complex is mixed with the composition and then the mixture is polymerized, phase separation occurs in the polymerization process, and the phase-separated matrix formed in the above-described form and the wavelength conversion layer formed in the emulsion region can be formed.

According to the above method, since the wavelength conversion particles and the plasmon particles are formed at a predetermined distance in the wavelength conversion layer, loss of electromagnetic waves caused by the plasmon resonance phenomenon can be minimized and the wavelength conversion efficiency of the wavelength conversion particles can be increased . In addition, it is possible to secure physical properties suitable for film formation, to secure adhesion between the other layer such as the barrier layer and the wavelength conversion layer, and to provide a wavelength conversion layer in the region where the wavelength conversion particles exist, Other factors that may adversely affect the physical properties of the nanoparticles may be more effectively controlled to form a film having excellent durability.

In one example, when the composite and the composition are mixed and polymerized, a wavelength conversion layer having a continuous phase matrix and an emulsion region dispersed in the matrix may be formed, and the emulsion region, as described above, And may include an A region and a B region each including different wavelength converting particles.

In order to obtain the wavelength conversion layer including the emulsion region A and the region B, two compositions containing the first radically polymerizable compound containing the wavelength converting particles were separately prepared, one composition containing green particles , A method in which red particles are contained in the other composition, and the both are mixed again and polymerized.

The method of mixing the composite with the composition to form the layer is not particularly limited. For example, the obtained mixture can be formed by coating on a suitable substrate by a known coating method.

The method of curing the layer formed in the above manner is not particularly limited. For example, a method of applying an appropriate range of heat to activate the initiator contained in the composition, or applying electromagnetic waves such as ultraviolet rays . &Lt; / RTI >

The production method of the optical film of the present application may further carry out the step of forming the barrier layer after forming the wavelength conversion layer through the above step if necessary or the polymerization process may be performed adjacent to the barrier layer .

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. Part of the incident light or a part of the light emitted by the wavelength converting particles collides with the plasmon particles in the optical film, and plasmon resonance phenomenon is generated to excite the wavelength converting particles by the electromagnetic wave have. Accordingly, it is possible to control the color purity or color of the light emitted from the optical film by adjusting the wavelength of the light emitted from the light source and the wavelength of the light emitted by the wavelength converting particles, thereby providing an optical film having increased wavelength conversion efficiency .

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 to 490 nm.

5 and 6 illustrate an illumination device including a light source and an optical film as described above.

As shown in Figs. 5 and 6, the light source and the optical film in the illumination device can be arranged so that the light irradiated from the light source can be incident on the optical film. 5, the light source 700 is disposed below the optical film 800, so that the light emitted from the light source 700 in the upward direction can be incident on the optical film 800.

Fig. 6 shows a case where the light source 700 is disposed on the side of the optical film 800. Fig. When the light source 700 is disposed on the side of the optical film 800 as described above, light from the light source 700, such as a light guiding plate 900 and a reflection plate 1000, Other means may be included to enable the optical film 800 to be efficiently incident.

The example shown in Figs. 5 and 6 is one example of the illumination device of the present application, and the illumination device 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.

Hereinafter, the optical films and the like of the present application will be specifically described by way of examples and comparative examples, but the scope of the optical films and the like is not limited to the following examples.

Example One.

Green PEG (PEG thiol) obtained by reacting the particles with a 1: 2 weight ratio of particles made of a ligand of an oleic acid and PEG thiol as a Quantum Dot particle for 4 hours in toluene, (Ag nanoplate, CN Vision) having a diameter of about 20 nm and a surface hydroxyl group are mixed in a weight ratio of 1: 1, and the mixture is stirred in acetone for 6 hours. After the reaction, the precipitate obtained through a centrifuge (5000 rpm, 10 minutes) and poly (ethyleneglycol) diacrylate (PEGDA, CAS No. 26570-48-9, solubility parameter (HSP) (Cal / cm ³ ) ^1/2 ), lauryl acrylate (CAS No. 2156-97-0, solubility parameter (HSP): about 8 (cal / cm ³ ) ^1/2 ) , Bisfluorene diacrylate (CAS No. 161182-73-6, solubility parameter (HSP): about 8 to 9 (cal / cm ³ ) ^1/2 ), polyvinylpyrrolidone Were mixed in a weight ratio of 0.2: 9: 1: 1: 0.05 (precipitate: PEGDA: LA: BD: surfactant). Irgacure 2959 and Irgacure 907 as radical initiators were then mixed to a concentration of about 1% The mixture was then placed between two barrier films (i-components) spaced apart at regular intervals to a thickness of about 100 mu m, Ray scattering particle complex is irradiated to form a light emitting layer by inducing radical polymerization to form a wavelength conversion particle-scattering particle complex. The distance between the wavelength conversion particle and the plasmon particle contained in the light emitting layer is about 100 to 1,000 nm.

Comparative Example One.

A poly (ethyleneglycol) diacrylate, CAS No. 26570-48-9, a solubility parameter (HSP) of about 18 (cal / cm ³ ) ^1/2 ), lauryl acrylate acrylate (LA, lauryl acrylate, CAS No .: 2156-97-0, solubility parameter (HSP): about ^{8 (cal / cm 3) 1/2} ), bis fluorene 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), plasmon particles (Ag nanoplate, CN Vision), and surfactants ( polyvinylpyrrolidone were mixed in a weight ratio of 9: 1: 1: 0.1: 0.1: 0.1 (PEGDA: LA: BD: green particles: plasmon particles: surfactant). Irgacure 2959 and Irgacure 907 as radical initiators were then added And the mixture was stirred for about 6 hours to prepare a mixture. A light emitting layer was formed in the same manner as in Example 1, except that this mixture was used.

Test Example - Evaluation of luminous efficiency

The light emission efficiency (Q.Y) according to the absorption spectrum (black line) and the emission spectrum (red line) of the optical film according to Example 1 and Comparative Example 1 was evaluated and shown in FIG. Specifically, as shown in Fig. 7, when the wavelength converting particle and the plasmon particle are included in the wavelength converting layer in the form of a complex as in the case of Example 1, the plasmon particle is relatively And the wavelength conversion efficiency was high.

100: Wavelength conversion particle
101: first ligand
200: plasmon particle
201: Second ligand
300: core part
400:
500: wavelength conversion layer
600: barrier layer
700: Light source
800: Optical film
900: light guide plate
1000: reflective layer

Claims

Wavelength converting particles;
Plasmon particles; And
And a ligand for binding the wavelength converting particles and the plasmon particles.

The method according to claim 1,
Wherein the length of the ligand is 100 to 1,000 nm.

The method according to claim 1,
Wherein the ligand comprises a first ligand bonded to the surface of the wavelength converting particle and a second ligand bonded to the surface of the plasmon particle, wherein the first ligand and the second ligand are mutually bonded.

The method of claim 3,
Wherein the first ligand and the second ligand are mutually bonded by hydrogen bonding or hydrophobic interaction.

The method according to claim 1,
Wherein the wavelength converting particle is a quantum dot or a polymer particle.

The method according to claim 1,
Wherein the plasmon particles are core cell-type particles comprising at least one metal particle core and an insulator cell covering the metal particle core.

A polymeric resin or a first radically polymerizable compound; And
A composition for an optical film comprising the composite of claim 1.

8. The method of claim 7,
Wherein the first radically polymerizable compound is any one selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), and a compound represented by the following formula (3)
[Chemical Formula 1]

(2)

(3)

In formulas (1) to (3)
Each Q is independently hydrogen or an alkyl group,
U is independently an alkylene group, an alkenylene group or 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 is an oxygen atom, a sulfur atom or an alkylene group,
Ar is an aryl group,
n is an arbitrary number.

8. The method of claim 7,
A second radically polymerizable compound which is phase separated after polymerization with the first radically polymerizable compound.

10. The method of claim 9,
The second radically polymerizable compound is a compound of formula (4): A compound of formula 5; A compound of the formula 6 below; A compound of formula (7); Nitrogen-containing radically polymerizable compounds; And a radically polymerizable compound comprising (meth) acrylic acid or a salt thereof.
[Chemical Formula 4]

[Chemical Formula 5]

[Chemical Formula 6]

(7)

In the formulas (4) to (7), each Q is independently hydrogen or an alkyl group,
U is 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 is a hydroxy group or a cyano group,
m and n are arbitrary numbers.

An optical film having a wavelength conversion layer comprising the composite of claim 1.

12. The method of claim 11,
The wavelength conversion layer is a continuous phase matrix; And an emulsion region dispersed in the matrix, wherein the composite is located in the matrix or emulsion region.

13. The method of claim 12,
Wherein the ratio of the complex contained in the emulsion region is 90% by weight or more based on the total complex contained in the wavelength conversion layer.

13. The method of claim 12,
Wherein the emulsion region comprises a polymerized unit selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), and a compound represented by the following formula (3)
[Chemical Formula 1]

(2)

(3)

13. The method of claim 12,
Wherein the emulsion region is in the form of particles having an average diameter in the range of 1 탆 to 200 탆.

13. The method of claim 12,
The emulsion region absorbs light within the range of 420 nm to 490 nm and absorbs light within the range of 420 nm to 490 nm and the A region including the first complex having the first wavelength conversion particle capable of emitting light within the range of 490 nm to 580 nm And a second composite having second wavelength conversion particles capable of emitting light within a range of 580 nm to 780 nm.

13. The method of claim 12,
The matrix is a compound of formula 4; A compound of formula 5; A compound of the formula 6 below; A compound of formula (7); Nitrogen-containing radically polymerizable compounds; And a radically polymerizable compound comprising (meth) acrylic acid or a salt thereof: (a) an optical film comprising at least one polymer selected from the group consisting of
[Chemical Formula 4]

[Chemical Formula 5]

[Chemical Formula 6]

(7)

12. The method of claim 11,
Further comprising a barrier layer on one or both sides of the wavelength conversion layer.

A method for producing a composite according to claim 1, comprising mixing the wavelength-converted particle surface-modified with the ligand and the plasmon particle surface-modified with the ligand.

11. A method for producing an optical film according to claim 11, which comprises mixing the composite of claim 1 with a polymer resin or a radically polymerizable composition.

21. The method of claim 20,
Wherein the radical polymerizable composition comprises a first radically polymerizable compound and a second radically polymerizable compound phase-separated after polymerization with the first radically polymerizable compound.

A light source and an optical film according to claim 11, wherein the light source and the optical film are arranged such that light from the light source can be incident on the optical film.

A display device comprising the illumination device of claim 22.