WO2021034104A1 - 양자점 복합체를 포함하는 양자점 필름, 및 디스플레이용 파장변환 시트 - Google Patents
양자점 복합체를 포함하는 양자점 필름, 및 디스플레이용 파장변환 시트 Download PDFInfo
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- WO2021034104A1 WO2021034104A1 PCT/KR2020/011043 KR2020011043W WO2021034104A1 WO 2021034104 A1 WO2021034104 A1 WO 2021034104A1 KR 2020011043 W KR2020011043 W KR 2020011043W WO 2021034104 A1 WO2021034104 A1 WO 2021034104A1
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- quantum dot
- acrylate
- dot composite
- quantum dots
- meth
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
- C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/505—Wavelength conversion elements characterised by the shape, e.g. plate or foil
Definitions
- the present invention relates to a quantum dot film including a quantum dot composite, and a wavelength conversion sheet for a display.
- Quantum Dot refers to ultrafine semiconductor particles having a size of several nanometers. When the quantum dots are exposed to light, electrons in an unstable state descend from the conduction band to the valence band and emit light of a specific frequency.
- quantum dots emit light of a shorter wavelength as the particle size is smaller, and light of a longer wavelength is emitted as the particle size is larger. Therefore, by adjusting the size of the quantum dots, visible light of a desired wavelength can be expressed, and various colors can be simultaneously implemented using quantum dots of various sizes. Therefore, it is possible to realize a desired natural color by controlling the size of a quantum dot, and it is attracting attention as a next-generation light source due to its good color reproducibility and good luminance.
- Quantum dots are formed into a film, and then a barrier film is mounted on both sides to produce a wavelength conversion sheet, and this is applied to a light guide plate of an LCD (Liquid Crystal Display) backlight unit.
- LCD Liquid Crystal Display
- red quantum dots are converted to red
- green quantum dots are converted to green to emit light
- blue light is emitted as it is, thereby realizing full color.
- a display using such a QD has an advantage that a combination of blue, green, and red close to natural light is possible, and thus a color close to natural light in a wide range that conventional phosphors cannot.
- quantum dot films are manufactured by mixing quantum dots with a curable resin and then forming a coating film. Since the quantum dots have a size of several nanometers, agglomeration phenomenon occurs between them, and it is difficult to achieve uniform dispersion in the curable resin, so that the uniformity of light emission is greatly reduced. In particular, there is a problem in that the light conversion efficiency rapidly decreases due to contact with moisture or air (ie, oxygen) penetrating from the outside of the quantum dot, and the lifespan of the display decreases.
- the wavelength conversion sheet is manufactured in the form of a multilayer structure, and when the adhesion between the quantum dot film and the barrier film is low, the penetration of moisture and air becomes easier, so that the quantum dot film is peeled from the barrier film, and the quantum dots are oxidized.
- This problem can be overcome by encapsulating the quantum dots with a hydrophobic resin, and the hydrophobic resin exhibits low adhesion to the barrier film, resulting in another problem.
- the quantum dot film prepared in this way has a problem that agglomerates with each other when the quantum dots are encapsulated, so that the particle size distribution is very wide, resulting in a problem of lowering luminous efficiency.
- Korean Patent Registration No. 10-1396871 encapsulates the surface of the quantum dot with polyethylene-based wax, polypropylene-based wax, or amide-based wax to ensure dispersion stability.
- the wax is a polar wax having an acid value in the range of 1 mg KOH/g to 200 mg KOH/g, and it is difficult to achieve uniform dispersion when mixed with a hydrophobic quantum dot.
- a commercially available quantum dot dispersion is dispersed in a solvent such as toluene, and this solvent is replaced with an acrylic monomer having a low viscosity such as isobornyl acrylate to prepare a dispersion.
- isobornyl acrylate can be polymerized through a double bond in a molecular structure, such a quantum dot dispersion can be used as it is in the process without removing the isobornyl acrylate when manufacturing a quantum dot film, etc., and has an advantage of low toxicity. .
- the content of quantum dots and isobornyl acrylate are applied in the same ratio during the manufacturing process of the film, so that the optical properties of the film are changed according to the content control, or it is difficult to secure the physical properties and reliability of the designed bar.
- isobornyl acrylate is used by substituting a solvent before the film manufacturing process, but in this case, the stability of the quantum dot is lowered, resulting in a problem that the optical properties of the manufactured quantum dot film are lowered.
- Patent Document 1 Republic of Korea Patent Publication No. 10-2016-0069393, (2016.06.16), manufacturing method of light conversion composite material, light conversion composite material, light conversion sheet including the same, backlight unit and display device
- Patent Document 2 Korean Laid-Open Patent No. 10-2013-0027317 (2013.03.15), quantum dot composite and method for manufacturing the same
- Patent Document 3 Republic of Korea Patent Publication No. 10-2017-0092934 (2017.08.14), composition for an optical film and an optical film comprising the same
- Patent Document 4 Korean Patent Registration No. 10-1396871 (May 19, 2014), composite, composition and device comprising the same
- Patent Document 5 US 9,534,313 (2017-01-03), Particles including nanoparticles dispersed in solid wax, method and uses thereof
- Patent Document 6 US 2002-0096795 (2003-03-04), Encapsulation of discrete quanta of fluorescent particles
- Patent Document 7 US 2006-0286378 (2006-12-21), Nanostructured composite particles and corresponding processes
- the present inventors have continuously conducted research in consideration of the above problems in various ways, and in particular, encapsulating quantum dots with a non-polar polyolefin wax or an ultraviolet curing silicone compound, and manufacturing encapsulated quantum dots in a form in which the quantum dots are dispersed in an acrylic polymer. And, by dispersing it in a photo-curable matrix resin, there are advantages in various aspects such as dispersibility of quantum dots, uniformity of particles, convenience in process, adhesion to barrier film, and the physical properties of the obtained quantum dot film and wavelength conversion sheet are improved. Was confirmed.
- an object of the present invention is to provide a quantum dot film and a method for manufacturing the same.
- an object of the present invention is to provide a wavelength conversion sheet comprising the quantum dot film.
- the present invention provides a quantum dot composite in which quantum dots are dispersed in an acrylic monomer or a polymer thereof, and encapsulated with an encapsulating resin.
- the acrylic monomer has an uncured liquid phase, and its polymer is characterized in that the acrylic monomer is photocured.
- the present invention provides a quantum dot film in which the quantum dot composite is dispersed in a matrix resin, and a wavelength conversion sheet including the same.
- thermosetting silicone resin a liquid thermosetting silicone resin, quantum dots, acrylic monomer, and photoinitiator
- the quantum dot composite according to the present invention is encapsulated using a non-polar polyolefin-based wax or an ultraviolet-curable silicone-based compound.
- a quantum dot film can be stably manufactured without aggregation.
- the quantum dot film prepared in this way can increase the conversion efficiency of quantum dots by uniformly dispersing the quantum dots in the matrix resin at a high concentration, and the encapsulation resin that encapsulates the quantum dots and the resin constituting the matrix resin prevents moisture or oxygen penetration from the outside. , It has excellent optical transmittance and prevents deterioration of quantum dots.
- the quantum dot film can be applied to a wavelength conversion sheet for a display and can implement a high-quality screen.
- quantum dots are dispersed in a matrix resin, and the quantum dots are dispersed in the matrix as it is or in an encapsulated form.
- a method using an encapsulating resin is used for the encapsulation.
- the content of the quantum dots in the encapsulated quantum dots is non-uniform, and there is a disadvantage in that oxygen or moisture in the air cannot be sufficiently blocked.
- the quantum dots when the quantum dots are encapsulated, a method of uniformly dispersing quantum dots using a separate acrylic polymer in addition to the encapsulating resin and effectively blocking oxygen or moisture in the air to increase the stability of the quantum dots and the reliability of the produced quantum dot film present.
- the encapsulation resin referred to in the present specification is hydrophobic, or a resin having a property of improving at least one of the functions such as hardness, oxygen permeation reduction, and water molecule permeation reduction is used.
- the encapsulating resin refers to a resin that is cured while being mixed with an acrylic monomer or polymer in which quantum dots are dispersed or cured while including an acrylic monomer or polymer in which quantum dots are dispersed. That is, the meaning of "encapsulated by an encapsulated resin” in the present specification means that the quantum dots are mixed with a dispersed acrylic monomer or polymer to be cured, and the term "capsule" does not mean a coating layer.
- the quantum dot according to the present invention is a quantum dot composite encapsulated with an encapsulating resin, wherein the quantum dot inside the encapsulating resin has a form dispersed in an acrylic monomer or a polymer thereof.
- a quantum dot absorbs light injected from a light source through a quantum confinement effect, and then converts a wavelength of light having a wavelength corresponding to a band gap of the quantum dot to emit light.
- the quantum dot may include a semiconductor selected from the group consisting of group II-VI, group III-V, group IV-VI, group IV semiconductors, and mixtures thereof. More specifically, the quantum dots are, for example, CdS, CdO, CdSe, CdTe, Cd 3 P 2 , Cd 3 As 2 , ZnS, ZnO, ZnSe, ZnTe, MnS, MnO, MnSe, MnTe, MgO, MgS, MgSe, MgTe, CaO, CaS, CaSe, CaTe, SrO, SrS, SrSe, SrTe, BaO, BaS, BaSe, BaTE, HgO, HgS, HgSe, HgTe, HgI 2 , AgI, AgBr, Al 2 O 3 , Al 2 S 3 , Al 2 Se 3 , Al 2 Te 3 , Ga 2 O 3 , Ga 2 S 3 , Ga 2 Se 3
- the quantum dots are group II-VI compound semiconductor nanocrystals such as CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, and III-V compound semiconductors such as GaN, GaP, GaAs, InP, InAs And nanocrystals or mixtures thereof.
- the central particle may have a core/shell structure, and each of the core and shell of the central particle may include the above-described compounds.
- the exemplified compounds may be included in the core or shell, respectively, alone or in combination of two or more.
- the central particle may have a CdSe/ZnS (core/shell) structure having a core containing CdSe and a shell containing ZnS.
- the particles of the quantum dot may have a core/shell structure or an alloy structure.
- Quantum dots having a core/shell structure can grow a shell layer in various shapes by adding other components in growing the crystal structure of the seed. In the case of forming a core/shell structure, there is an advantage of satisfying characteristics such as high luminous efficiency and high luminescence clarity while simultaneously satisfying other characteristics such as thermal stability or insulation.
- Quantum dot particles having such a core/shell structure or alloy structure are CdSe/ZnS, CdSe/ZnSe/ZnS, CdSe/CdSx(Zn1-yCdy)S/ZnS, CdSe/CdS/ZnCdS/ZnS, InP/ZnS, InP/ Ga/ZnS, InP/ZnSe/ZnS, PbSe/PbS, CdSe/CdS, CdSe/CdS/ZnS, CdTe/CdS, CdTe/ZnS, CuInS 2 /ZnS, Cu 2 SnS 3 /ZnS.
- the quantum dots may be perovskite nanocrystal particles.
- Perovskite contains a structure of ABX 3 , A 2 BX 4 , ABX 4 or A n-1 B n X 3n+1 (n is an integer between 2 and 6), wherein A is an organic ammonium or alkali metal material And B is a metal material, and X may be a halogen element.
- the organic ammonium is an amidinium-based organic ion, (CH 3 NH 3 ) n , ((C x H 2x+1 ) n NH 3 ) 2 (CH 3 NH 3 ) n , (RNH 3 ) 2 , (C n H 2n+1 NH 3 ) 2 , (CF 3 NH 3 ), (CF 3 NH 3 ) n , ((C x F 2x+1 ) n NH 3 ) 2 (CF 3 NH 3 ) n , ((C x F 2x+1 ) n NH 3 ) 2 or (C n F 2n+1 NH 3 ) 2 ) (n is an integer greater than or equal to 1, and the alkali metal material is Na, K, Rb, Cs or May be Fr.
- B is a divalent transition metal, rare earth metal, alkaline earth metal, Pb, Sn, Ge, Ga, In, Al, Sb, Bi, Po, or an ion of a combination thereof, wherein X is a Cl, Br, I ion Or it may be a combination of these.
- the quantum dots may be doped perovskite nanocrystal particles.
- the doped perovskite contains a structure of ABX 3 , A 2 BX 4 , ABX 4 or A n-1 B n X 3n+1 (n is an integer between 2 and 6), and a part of A is A ', wherein a part of B is substituted with B', or a part of X is substituted with X', wherein A and A'are organic ammonium, and B and B'are metallic substances.
- X and X' may be halogen elements.
- the A and A' is an amidinium-based organic ion, (CH 3 NH 3 ) n , ((C x H 2x+1 ) n NH 3 ) 2 (CH 3 NH 3 ) n , (RNH 3 ) 2 , (C n H 2n+1 NH 3 ) 2 , (CF 3 NH 3 ), (CF 3 NH 3 ) n , ((C x F 2x+1 ) n NH 3 ) 2 (CF 3 NH 3 ) n , (C x F 2x+1 ) n NH 3 ) 2 or (C n F 2n+1 NH 3 ) 2 and (n is an integer greater than or equal to 1, x is an integer greater than or equal to 1), wherein B and B'are divalent transition metals , Rare earth metal, alkaline earth metal, Pb, Sn, Ge, Ga, In, Al, Sb, Bi or Po, and X and X'may be Cl, Br
- the quantum dots may be spherical, oval, rod-shaped, wire, pyramid, cube, or other geometric or non-geometric shape.
- spherical or elliptical nanoparticles having an average particle diameter of 1 to 20 nm, preferably 1 to 10 nm, and the light emission wavelength varies depending on the size, so it is possible to obtain light of a desired color by selecting a quantum dot of an appropriate size.
- Quantum dots with larger particle sizes usually emit light of lower energy when compared to quantum dots with smaller particle sizes, although made from the same material.
- the quantum dots may include, for example, at least one selected from the group consisting of quantum dots that convert blue light into red light, quantum dots that convert blue light into green light, and quantum dots that convert green light into red light.
- quantum dots are supplied in the form of a colloid (or dispersion) dispersed in a solvent (eg, toluene), and a ligand is attached for surface stabilization.
- the ligand is a hydrophobic organic ligand that enhances the dispersibility of quantum dots and prevents the phenomenon of clumping together.
- the ligand is removed before use or used by replacing it with another ligand.
- the ligand may prevent quantum dots adjacent to each other from being easily aggregated and quenched.
- the ligand is combined with the quantum dot so that the quantum dot has hydrophobicity. Accordingly, when the quantum dots and the quantum dots including the ligand are dispersed in a coating layer or a film-forming resin (resin), dispersibility in the resin may be improved compared to the quantum dots without the ligand.
- R 3 OH, CO 2 H, NH 2 , SH, or PO.
- 6 ⁇ p ⁇ 30, and the alkyl group represented by CH 2 may be linear or branched.
- the ligands include hexadecylamine, octadecyl amine, octylamine, trioctylphosphine, triphenolphosphine, and t-butylphosphine ( t-butylphosphine), trioctylphosphine oxide, pyridine or thiophene, preferably octadecylamine.
- a surface treatment agent such as a phosphoric acid ester compound having an acid value of 10 or more may be used.
- the phosphoric acid ester-based compound may include a hydroxy group present in the phosphoric acid ester ((HO) 2 PO(OR)) or phosphoric acid (H 3 PO 4 ) or a form in which a hydrogen atom of a hydroxy group is substituted or unsubstituted with another functional group.
- the phosphate ester compounds (H 2 PO 3 -) may be represented in the form of, but is not limited to such.
- the "phosphoric acid ester system” may include at least one selected from the group consisting of phosphorous acid derivatives, phosphoric acid derivatives, phosphonic acid derivatives, and phosphinic acid derivatives.
- the phosphoric acid ester compound may further include at least one of a polyether moiety, a polyester moiety, and a phosphoric acid group in one molecule.
- the surface treatment agent may be included in an amount of 1 to 250 parts by weight, preferably 3 to 200 parts by weight, more preferably 5 to 100 parts by weight, based on 100 parts by weight of the total solid content of the quantum dot.
- the surface treatment agent When the surface treatment agent is included within the above range, the deaggregation effect of the quantum dots is excellent, it is possible to suppress the precipitation phenomenon due to polarity difference from the quantum dot dispersion liquid according to the present invention and other compositions, and serve as a protective layer of the quantum dots in the film manufacturing process It is preferable because it can be performed.
- the deaggregation effect of the quantum dots may be slightly lowered, and when it is included beyond the above range, the developing properties of the resin composition including the quantum dot dispersion may be slightly decreased. It is preferably included.
- the quantum dots are dispersed in an acrylic monomer or a polymer thereof.
- the acrylic monomer has an uncured liquid phase and is polymerized into an acrylic polymer through photocuring.
- the acrylic polymer effectively blocks oxygen or moisture in the air to further increase the stability of the quantum dot and the reliability of the produced quantum dot film.
- the acrylic monomer is used as a liquid at room temperature for uniform dispersion of quantum dots in the manufacturing process, and has a viscosity of 3 to 500 cps, for example.
- Such an acrylic monomer has a functional group capable of being polymerized or cured by irradiation with light in the molecular structure.
- acrylic monomers are as follows, wherein the term'(meth)acrylate' refers to methacrylate or acrylate.
- the acrylic monomer may be a monofunctional acrylic monomer having one functional group in the molecular structure, or a multifunctional acrylic monomer/oligomer having two or more functional groups.
- the monofunctional acrylic monomer is isobornyl (meth)acrylate, isooctyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, benzyl (meth)acrylate, norbornyl (meth) Acrylate, isodecyl (meth)acrylate, cyclohexyl (meth)acrylate, n-hexyl (meth)acrylate, adamantyl acrylate, acryloylmorpholine, tetrahydrofuryl (meth)acrylate, 2- It may include one or more monomers selected from the group consisting of phenoxyethyl (meth)acrylate, caprolactone (meth)acrylate, and cyclopentyl acrylate.
- polyfunctional acrylic oligomers include urethane (meth)acrylate, epoxy (meth)acrylate, polyester (meth)acrylate, acrylic (meth)acrylate, polybutadiene (meth)acrylate, and silicone (meth)acrylic. It may include one or more oligomers selected from the group consisting of rate and melamine (meth)acrylate. At this time, the oligomer may have a weight average molecular weight in the range of 100 to 1000.
- 1 selected from the group consisting of non-polar acrylates isobornyl (meth)acrylate, lauryl (meth)acrylate, cyclohexyl (meth)acrylate, and 3,3,5-trimethylcyclohexyl (meth)acrylate
- More than one species is used, and most preferably isobornyl acrylate (IBOA), isodecyl acrylate (IDA), and isobornyl methacrylate (IBOMA) are used.
- acrylic monomers When two or more functional groups are included among the acrylic monomers, they may be crosslinked by light irradiation, and a known photocrosslinking agent may be further used if necessary.
- the acrylic monomer or polymer thereof is used in an amount of 10 to 500 parts by weight, 20 to 300 parts by weight, and 50 to 200 parts by weight based on 100 parts by weight of the quantum dot. If the content is less than the above range, the effect of blocking oxygen or moisture in the air due to the acrylic monomer or polymer thereof is insufficient. Conversely, if the content is out of the above range, the size of the quantum dot composite increases more than necessary or the film transparency when applied to a quantum dot film Is lowered, and the quantum efficiency of the quantum dot may be lowered, so it is appropriately used within the above range.
- the quantum dot composite of the present invention has a structure encapsulated by using an encapsulating resin of quantum dots dispersed in an acrylic monomer or a polymer thereof.
- the encapsulation resin is cured by mixing with an acrylic monomer or polymer in which quantum dots are dispersed, or cured while including an acrylic monomer or polymer in which quantum dots are dispersed.
- the term "encapsulated structure" is not in the form of a “simple coating or coating layer such as a coating film”, which is meant by “capsule”, and means that the quantum dots are cured in a mixed state with an acrylic monomer or polymer dispersed therein. .
- the encapsulating resin is a resin having a hydrophobic property or a property that improves one or more of the functions such as hardness, reduction in oxygen permeation, and reduction in water molecule permeation, and preferably a non-polar olefin-based wax or a silicone-based resin.
- the encapsulation resin may be a non-polar polyolefin wax, which is a compound capable of solidifying by heat.
- Wax-based compounds are in a solid state at room temperature, but have a melting point at 40 to 180°C and change into a fluid when the temperature is increased above the melting point, and are resins having a molecular weight of hundreds to tens of thousands.
- the resin includes petroleum wax, animal natural wax, vegetable natural wax, and synthetic wax depending on raw materials.
- it is a polyolefin-based wax, preferably a non-polar (or non-polar) polyolefin-based wax.
- Molecules exhibit polarity and nonpolarity according to the atomic arrangement, and polarity is mixed with polarity and nonpolarity is mixed with each other.
- the bonding force of the polarity is higher than that of the non-polar bonding force, the non-polar molecules cannot break the bond between the polar molecules, so that mixing between them is not achieved.
- the acrylic polymer exists as a monomer in an uncured state, that is, a liquid state.
- the non-polar polyolefin-based wax of the present invention exists as a lamella model in which the chains are not disorderly and messy, but the folded state forms a bundle after the polymer chains are unfolded. Quantum dots and uncured acrylic monomers safely settle between the chains that make up the lamellar. Accordingly, while the encapsulating resin is solidified by a decrease in temperature, quantum dots and uncured acrylic monomers present between the chains are enclosed.
- the ligand on the surface of the quantum dot has hydrophobicity and nonpolarity
- the uncured acrylic monomer also has hydrophobicity. Accordingly, when a polar polymer is used to contain quantum dots and uncured acrylic monomers, the quantum dots or uncured acrylic monomers exist outside the encapsulating resin, not in the lamellar structure, so that their inclusion is not performed smoothly.
- the binding of the non-polar molecules is achieved by the Van der Waals action, and in the present invention, when a non-polar polymer is used, the Van der Was action occurs on the ligand of the quantum dot and the uncured acrylic monomer.
- the quantum dots and the uncured acrylic monomer exist between or near the polymer chains in the entangled state, so that a large amount of quantum dots can be more uniformly covered after the final curing.
- a typical wax among the polyolefin waxes is a polyethylene wax.
- the polyethylene-based wax has a repeating unit of -[CH 2 -CH 2 ]- and exhibits non-polarity because it has a symmetrical structure of CH 2.
- the ligand of the quantum dot exists between the CH 2 chain of the polyethylene-based wax.
- the substituent acts as an arm and the quantum dot and the uncured acrylic monomer are added to the polymer. It can be fixed more easily.
- the increase in hydrophobicity may vary depending on the type and length of the substituent.
- the non-polar polyolefin-based wax substituted with an alkyl group includes the repeating structures of Formulas 1 and 2 below.
- R 1 is a C1 to C15 alkyl group, more preferably a C1 to C10 alkyl group.
- the alkyl group is a methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, t-butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dode It may be a sil group, isopropyl group, t-butyl group, isobutyl group, 2-methyl-pentyl group, 2-ethyl-hexyl group, 2-propyl-heptyl group, and 2-butyl-octyl group.
- R 1 when R 1 is an alkyl group, the alkyl group may be one or more types of alkyl groups. That is, when the repeating unit of Formula 2 together with Formula 1 forms a main chain, R 1 may be substituted with only a methyl group (eg, HDPE), or may be substituted with two or more types such as a methyl group, a propyl group, and/or a hexyl group.
- a methyl group eg, HDPE
- b is related to the degree of substitution of the alkyl group, and the higher the value, the higher the degree of substitution of the alkyl group. If the degree of substitution of the alkyl group is high, the hydrophobicity increases, but the physical properties as a'wax' of excessive substitution, that is, the melting point increases, making it difficult to prepare an emulsion composition. Therefore, it is important to limit the numerical values of a and b.
- non-polar polyolefin wax of the present invention has a molecular weight of 300 to 30,000, preferably 700 to 25,000, more preferably 1000 to 20,000, and a melting point of 40 to 180°C, preferably 90 to 170°C, more preferably 100 To 160°C.
- the non-polar polyolefin-based wax may be high-density polyethylene (HDPE), low-density polyethylene (LDPE), and linear low-density polyethylene (LLDPE) wax.
- HDPE high-density polyethylene
- LDPE low-density polyethylene
- LLDPE linear low-density polyethylene
- the HDLE, LDPE, and LLDPE are due to the difference in density according to the manufacturing method, HDPE is 0.941 g/cm 3 or more, LDPE is 0.915-0.925 g/cm 3 , LLDPE is 0.915-0.925 g/cm 3 Have.
- the encapsulation resin may be a silicone resin.
- the silicone resin is a liquid siloxane polymer, and may be a linear silicone oil and a modified silicone oil depending on the type of organic bonded to the silicon atom and the degree of polymerization of the siloxane.
- Representative straight-chain silicone oils include dimethyl silicone oil in which all organic groups are methyl groups, methylphenyl silicone oil with phenyl group introduced, methylphenyl silicone oil, diphenyl silicone oil, copolymer of polysiloxane and diphenylsiloxane, methylhydrogen silicone oil, etc. There is this.
- the modified silicone oil refers to a silicone oil in which an organic group other than a methyl group or a phenyl group is introduced, and methylhydroxy silicone oil, fluoro silicone oil, polyoxyether copolymer, alkyl modified silicone oil, higher fatty acid modified silicone oil, amino side Silicone oil, epoxy modified silicone oil, etc.
- These silicones are liquid resins with a viscosity of 50 cps swelling at room temperature and have a low surface tension.
- it since it is non-polar, it is soluble in aromatic solvents such as toluene and xylene, and has poor solubility in polar solvents of water or alcohol.
- Encapsulation using a silicone resin may be performed through curing, and the curing may be varied by a curing reaction mechanism, and may be a thermosetting silicone resin or an ultraviolet curing silicone resin.
- Curing may be thermal curing or ultraviolet curing, and a curing agent such as an organic peroxide may be used for thermal curing, and an ultraviolet curing agent may be used for ultraviolet curing. If necessary, a platinum catalyst can be used to accelerate curing.
- a curing agent such as an organic peroxide may be used for thermal curing
- an ultraviolet curing agent may be used for ultraviolet curing.
- a platinum catalyst can be used to accelerate curing.
- the use of a curing agent versus a silicone resin may vary depending on the curing mechanism.
- addition reaction may occur in the presence of a platinum catalyst, or curing may be performed through a free radical reaction by applying an organic peroxide and heat.
- the organic peroxide include 2,4-dichlorobenzoyl peroxide, benzoyl peroxide, dicumyl peroxide, di-tert-butylperbenzoate and 2,5-bis(tert-butylperoxy)benzoate.
- the organic peroxide is used in a concentration of 0.1 to 10 parts by weight, preferably 0.2 to 5 parts by weight, based on 100 parts by weight of the silicone resin.
- the encapsulating resin is used in an amount of 10 to 600 parts by weight, 50 to 400 parts by weight, and 100 to 300 parts by weight based on 100 parts by weight of the quantum dots. If the content is less than the above range, uniform dispersion of the quantum dots is difficult and the blocking effect of oxygen or moisture in the air is insufficient. On the contrary, if the content is out of the above range, the size of the quantum dot composite increases more than necessary or the film transparency when applied to a quantum dot film As well as lowering the quantum efficiency of the quantum dot may decrease, it is used appropriately in the above range.
- the quantum dot composite of the present invention may have a size in the range of 0.1 ⁇ m to 200 ⁇ m, 0.5 ⁇ m to 180 ⁇ m, 1 ⁇ m to 150 ⁇ m, and 5 ⁇ m to 100 ⁇ m.
- This size can be controlled by the content of the quantum dots, acrylic monomers or polymers, and the encapsulating resin, and when it has the above range, various physical properties including quantum efficiency of the quantum dots are excellent.
- the quantum dot composite of the present invention as described above is dispersed in the matrix resin, which can be manufactured in various forms, but is preferably manufactured in the form of a quantum dot film in a film state.
- the resin constituting the matrix resin maintains optical transparency and must be used in a form attached to another film (e.g., a barrier film) due to the characteristics of a quantum dot film, so it must have high adhesion to other films and can satisfy these characteristics.
- Resins having a property can be used.
- the matrix resin of the present invention may be a photocurable resin in which polymerization occurs by active energy rays, and a resin having hydrophilicity unlike the encapsulating resin may be suitable to be suitable for a manufacturing method using an emulsion.
- Photocurable resin' is a component that crosslinks as radicals are generated in the molecular chain with strong active energy rays such as UV, EB, and radiation.
- the photoinitiator contained in the pressure-sensitive adhesive absorbs ultraviolet rays having a wavelength of 200 to 400 nm to exhibit reactivity, and then reacts with a monomer, which is a main component of the resin, to polymerize and cure.
- a photopolymerization reaction is initiated, and the oligomer and monomer, which are the main components of the resin, are polymerized and cured.
- the matrix resin may be an acrylic polymer.
- the acrylic polymer may be prepared through polymerization of at least one composition consisting of an acrylic oligomer, an acrylic monomer, and a combination thereof, and the matrix resin obtained after final curing may be an acrylic resin.
- the acrylic oligomer may be an epoxy acrylate resin.
- Epoxy acrylate resin is a resin in which the epoxide group of the epoxy resin is substituted with an acrylic group, for example, the epoxy acrylate resin is bisphenol A glycerolate diacrylate, bisphenol-A. Consisting of oxylate diacrylate (bisphenol A ethoxylate diacrylate), bisphenol A glycerolate dimethacrylate, bisphenol-A ethoxylate dimethacrylate (bisphenol A ethoxylate dimethacrylate) and combinations thereof It may be any one selected from the group. Like epoxy resins, epoxy acrylate resins have low moisture permeability and air permeability due to their main chain properties.
- the acrylic monomer that can be used is not particularly limited in the present invention, and any one can be used as long as it is known.
- the acrylic monomer may be one or more homopolymers or copolymers selected from the group consisting of an unsaturated group-containing acrylic monomer, an amino group-containing acrylic monomer, an epoxy group-containing acrylic monomer, and a carboxylic acid group-containing acrylic monomer.
- the amino group-containing acrylic monomers include 2-aminoethyl acrylate, 2-aminoethyl methacrylate, 2-dimethylaminoethyl acrylate, 2-dimethylaminoethyl methacrylate, 2-aminopropyl acrylate, and 2-aminopropyl methacrylate.
- Acrylate, 2-dimethylaminopropyl acrylate, 2-dimethylaminopropyl methacrylate, 3-aminopropyl acrylate, 3-aminopropyl methacrylate, 3-dimethylaminopropyl acrylate, 3-dimethylaminopropyl methacrylate Rate, etc. are possible.
- Epoxy group-containing acrylic monomers include glycidyl acrylate, glycidyl methacrylate, glycidyloxyethyl acrylate, glycidyloxyethyl methacrylate, glycidyloxypropyl acrylate, and glycidyloxypropyl meta. Acrylate, glycidyloxybutyl acrylate, glycidyloxybutyl methacrylate, and the like are possible.
- the acrylic monomer containing a carboxylic acid group is acrylic acid, methacrylic acid, acryloyloxyacetic acid, methacryloyloxyacetic acid, acryloyloxypropionic acid, methacryloyloxypropionic acid, acryloyloxybutyric acid, methacryloyloxybutyric acid. Etc. are possible.
- the quantum dot composite is included in an amount of 0.5 to 30 parts by weight, preferably 1 to 15 parts by weight, based on 100 parts by weight of the matrix resin containing the photocurable resin. If the content of the quantum dot composite is less than the above range, the light conversion effect is insignificant and the light conversion efficiency decreases. If it is too much, there is a problem in that uniform dispersion is difficult.
- the matrix resin may further contain a crosslinking agent for crosslinking.
- a crosslinking agent for crosslinking include ethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate having 2 to 14 ethylene groups, trimethylolpropane di(meth)acrylate, trimethylolpropane Tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, 2-trisacryloyloxymethylethylphthalic acid, propylene glycol di(meth)acrylate, the number of propylene groups is 2 And 14 to 14 polypropylene glycol di(meth)acrylate, dipentaerythritol penta(meth)acrylate, and dipentaerythritol hexa(meth)acrylate.
- Each of these crosslinking agents can be used alone or in combination of two or more.
- the crosslinking agent may
- the quantum dot film of the present invention may further include additional materials for various purposes.
- Ceramic nanoparticles are used as an additional material, which may be used in any one of a quantum dot composite, an encapsulating resin, and a matrix resin, and is preferably used with a quantum dot in a quantum dot composite.
- ceramic nanoparticles can be used together with quantum dots to minimize aggregation between quantum dots. That is, if there is a clustering phenomenon between quantum dots, the emission wavelength and the half width (FWHM) are changed. Specifically, if two quantum dots are clustered, the size of the quantum dots increases accordingly. As an example, the size of the quantum dots that convert blue light into green light is 2 nm to 2.5 nm.If two green light quantum dots are clustered, the size changes to 4 nm to 5 nm quantum dots. The wavelength and half-width (FWHM) of the green light generated and converted increases, so that an accurate fluorescence effect does not appear.
- FWHM half-width
- Ceramic nanoparticles increase the reliability of the quantum dot film and increase long-term stability by preventing the deterioration of the quantum dot by releasing heat generated during display driving or when the quantum dot emits light to the outside (or the matrix resin side).
- ceramic nanoparticles have the effect of absorbing heat.
- blue light when blue light is incident on a green quantum dot using a green quantum dot, it is converted into green light to emit light. During this process, some of the energy of the blue light is converted into heat, thereby increasing the temperature of the quantum dot.
- quantum dots the luminous efficiency varies greatly with temperature. That is, when the quantum dot emits light, the luminous efficiency decreases as the surrounding temperature increases, and when the temperature decreases, the luminous efficiency increases. Accordingly, it is advantageous to lower the temperature in order to increase the luminous efficiency.
- the functions of the ceramic nanoparticles described above have a different function from that of the conventional ceramic particles to increase light conversion efficiency through light scattering.
- ceramic nanoparticles may be included in any one or more of a quantum dot composite, an encapsulating resin, and a matrix resin, but preferably exhibit the above effect when encapsulated together with the quantum dot.
- the usable ceramic nanoparticles may be at least one selected from the group consisting of oxides such as silica, alumina, titania, zirconia, tungsten oxide, and zinc oxide , nitrides such as Si 3 N 4, and semiconductor materials such as ZnSe.
- These ceramic nanoparticles are more preferably a nanometer size having an average particle diameter of 5 nm to 450 nm. If the size is less than the above range, it is difficult to uniformly disperse particles due to aggregation, whereas if the size exceeds the above range, the amount of quantum dots is relatively reduced, thereby lowering the light conversion efficiency of the quantum dot film.
- the content of the ceramic nanoparticles is used in an amount of 100 to 500 parts by weight, preferably 150 to 400 parts by weight, based on 100 parts by weight of the quantum dots.
- the content exceeds the above range, light absorption increases, thereby reducing light conversion efficiency or reducing film non-uniformity and transparency.
- the light-scattering agent as described above may be added as an additional material.
- the light scattering agent may be added to any of the quantum dot composite, encapsulating resin, and matrix resin.
- the light scattering agent is substantially positioned so as to be dispersed in the acrylic polymer together with the quantum dots, it is possible to maximize the scattering effect and thereby improve the wavelength conversion efficiency.
- UV absorbers can be suitably blended within a range that does not impair the effects of the present invention.
- the quantum dot film according to the present invention is largely
- the quantum dot composite is formed differently depending on the type of encapsulating resin.
- the encapsulating resin is a non-polar polyolefin-based wax
- the following steps are performed.
- the encapsulating resin is an ultraviolet curing silicone resin
- the following steps are performed.
- the encapsulating resin is a thermally curable silicone resin
- the following steps are performed.
- thermosetting silicone resin a liquid thermosetting silicone resin, quantum dots, acrylic monomer, and photoinitiator
- the first and second solvents of steps a1), b2), b3) and steps b1), c2), and c3) are phase separated from each other by hydrophilicity/hydrophobicity, and in the phase-separated hydrophobic region, encapsulation resin, quantum dots, acrylic monomers, A photoinitiator and a second solvent are present.
- hydrophobicity and hydrophilicity refers to a material that exhibits low intermolecular attraction to an aqueous solvent such as water
- hydrophilicity' refers to a material that exhibits high intermolecular attraction to an aqueous solvent such as water.
- the criterion for the classification of the hydrophobicity and the hydrophilicity is not particularly limited as long as they are relative to each other and are capable of being phase separated to form respective regions.
- the first solvent is a hydrophilic solvent, and preferably a hydrophilic polar solvent is used.
- a hydrophilic solvent preferably a hydrophilic polar solvent is used.
- water may be one or more selected from lower alcohols including methanol, ethanol, propanol, isopropanol, and butanol, preferably isopropanol, butanol, or a mixed solvent thereof.
- the second solvent is a hydrophobic solvent, and, for example, a hydrophobic non-polar solvent is used.
- aliphatic hydrocarbon-based solvents including pentane, hexane, heptane, octane, decane, cyclohexane and isoparaffin
- aromatic hydrocarbon-based solvents including toluene, benzene, dichlorobenzene, and chlorobenzene
- tetrahydro One selected from the group consisting of an ether solvent including furan, 1,4-dioxane, and diethyl ether, and other solvents such as methylene chloride may be used, and toluene may be preferable.
- Surfactants are capable of forming micelles in a first solvent to form droplets, and a hydrophobic region is formed in the droplets to form non-polar polyolefin waxes, quantum dots, acrylic monomers, photoinitiators, and second solvents therein.
- a hydrophobic region is formed in the droplets to form non-polar polyolefin waxes, quantum dots, acrylic monomers, photoinitiators, and second solvents therein.
- silicone-based, fluorine-based, ester-based, cationic, anionic, nonionic, amphoteric surfactants, etc. can be preferably used, and specifically, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers , Polyethylene glycol diesters, sorbitan fatty acid esters, fatty acid-modified polyesters, tertiary amine-modified polyurethanes, polyethyleneimines, and the like.
- silicone surfactant examples include commercially available products such as DC3PA, DC7PA, SH11PA, SH21PA, and SH8400 from Dow Corning Toray Silicon, and TSF-4440, TSF-4300, TSF-4445, TSF-4446, TSF- 4460 and TSF-4452.
- fluorine-based surfactant examples include commercially available products such as Megapieces F-470, F-471, F-475, F-482, and F-489 manufactured by Dai Nippon Ink Kagaku Kogyo.
- other commercially available products include KP (Shin-Etsu Chemical Co., Ltd.), POLYFLOW (Kyoeisha Chemical Co., Ltd.), EFTOP (Tochem Products), and MEGAFAC.
- cationic surfactant examples include amine salts such as stearylamine hydrochloride or lauryltrimethylammonium chloride, or quaternary ammonium salts.
- anionic surfactant examples include higher alcohol sulfate ester salts such as sodium lauryl alcohol sulfate or sodium oleyl alcohol sulfate, alkyl sulfates such as sodium lauryl sulfate or ammonium lauryl sulfate, sodium dodecylbenzenesulfonate, or Alkyl aryl sulfonates, such as sodium dodecyl naphthalene sulfonate, etc. are mentioned.
- higher alcohol sulfate ester salts such as sodium lauryl alcohol sulfate or sodium oleyl alcohol sulfate
- alkyl sulfates such as sodium lauryl sulfate or ammonium lauryl sulfate
- sodium dodecylbenzenesulfonate sodium dodecylbenzenesulfonate
- Alkyl aryl sulfonates such as sodium dodecyl n
- nonionic surfactant examples include polyoxyethylene alkyl ether, polyoxyethylene aryl ether, polyoxyethylene alkyl aryl ether, other polyoxyethylene derivatives, oxyethylene/oxypropylene block copolymers, sorbitan fatty acid esters, Polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, glycerin fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene alkylamine, and the like.
- Each of the above-exemplified surfactants may be used alone or in combination of two or more, and CONION 275-90 is preferably used.
- the surfactant is dispersed in a first solvent to form droplets, and a non-polar polyolefin wax, quantum dot, acrylic monomer, photoinitiator, and a second solvent are present in the droplet.
- the droplet has a size of 0.1 ⁇ m to 100 ⁇ m, preferably 1 ⁇ m to 10 ⁇ m, and a first solvent is present outside the droplet.
- the size of the droplets can be controlled according to the content ratio of each composition, and the content of the first solvent as an external phase and the composition on the inside of the droplet is 0.1:99.9-20:80, preferably 10:90-5:95 in weight ratio. I can. If the mixing ratio is out of the above range, droplets are not formed or the distance between the quantum dots becomes close, thereby inhibiting dispersion, and a decrease in light conversion efficiency may occur.
- the size of the droplet can be controlled through the use of a surfactant.
- Surfactants as described above may be used as surfactants that can be used.
- the photoinitiator is capable of photopolymerizing an acrylic monomer, and can be used regardless of its kind as long as it absorbs light in the ultraviolet region having a wavelength of 100 nm to 400 nm to form radicals by decomposition of molecules.
- a benzoin-based, hydroxy ketone-based, amino ketone-based, or phosphine oxide-based photoinitiator may be used.
- the acrylic monomer the above-described monomer may be used, and as an example, a quantum dot dispersion in which quantum dots are dispersed in isobornyl acrylate may be used as it is.
- the isobornyl acrylate may be used alone or may be used by mixing various acrylic monomers as described above.
- the heating in step c1) is performed by applying heat above the melting point of the non-polar polyolefin-based wax.
- the melting point may vary depending on the type of wax. Since the low-density polyethylene wax-based compound has a melting point of 80°C to 140°C, heat is applied at this temperature to liquefy.
- the stirrer of the mixer When warming, the stirrer of the mixer is operated so that the micelles in the dispersion have a uniform size, and non-polar polyolefin wax, quantum dots, acrylic monomers, photoinitiators, and a second solvent can be injected into the dispersion.
- the stirring may vary depending on the size of the mixer and the content of each composition, but may be stirred at a level of 100 to 5000 rpm.
- the mixing time is at a level that can be uniformly mixed, and is usually performed for 1 minute to 30 minutes.
- the temperature of the mixer is lowered to solidify the liquid non-polar polyolefin-based wax.
- the temperature of the mixer is gradually lowered to room temperature to cool or rapid cooling to adjust the cooling rate.
- the cooling rate is fast, that is, if the temperature of the non-polar polyolefin wax in the liquid state is rapidly lowered, the size of the quantum dot composite formed by the non-polar polyolefin wax may decrease. Conversely, if the temperature is gradually lowered, the size of the quantum dot composite increases. I can. It is usually cooled at a rate of 0.1° C. to 2° C. per minute, and is stably prepared in a micron size.
- quantum dots, uncured acrylic monomers, photoinitiators, and a second solvent are present inside the encapsulated with non-polar polyethylene wax, and this quantum dot composite is micron-meter spherical particles, independently prepared without agglomeration with each other. It is dispersed in one solvent, that is, a dispersion.
- the quantum dot composite can be recovered and used through filtration, and if necessary, the particle size distribution of the quantum dot composite can be adjusted using various sieves.
- encapsulation is performed by irradiating ultraviolet rays in step d2).
- Curing occurs through UV irradiation, and high-pressure mercury lamps, electrodeless lamps, ultra-high-pressure mercury lamps, carbon arc lamps, xenon lamps, LED lamps, metal halide lamps, chemical lamps, and black lights are used.
- the high-pressure mercury lamp it is performed under conditions of, for example, 5 mJ/cm 2 to 3000 mJ/cm 2, specifically 400 mJ/cm 2 to 1500 mJ/cm 2.
- the irradiation time varies depending on the type of the light source, the distance between the light source and the coating film, the thickness of the coating film, and other conditions, but it may be usually a few seconds to several tens of seconds, and in some cases, a few seconds.
- encapsulation is performed by applying the heat of step d3).
- Thermal curing takes place by application of heat, which is carried out in a mixer equipped with a stirrer.
- the mixer is equipped with a temperature control device such as a heater that can increase the temperature for thermal curing.
- the temperature and time during the thermal curing may vary depending on the type of the thermosetting resin.
- the silicone oil is performed at 100°C to 125°C for 1 hour to 5 hours.
- a step of irradiating ultraviolet rays is performed before step d1), before step e2), and before step e3) to perform the step of curing the acrylic monomer.
- ultraviolet irradiation before e2) can be excluded if necessary.
- the acrylic monomer initiates ultraviolet curing with a photoinitiator by ultraviolet irradiation and is polymerized into an acrylic polymer. At this time, the ultraviolet irradiation is performed in the same manner as in step d2) mentioned above or as mentioned therein.
- quantum dots are dispersed in an acrylic polymer, and a particle-state quantum dot composite encapsulated with an encapsulating resin can be obtained.
- the quantum dot composite is recovered through the filtration process of steps d1), e2) and e3).
- the quantum dot composite may be double encapsulated through the same or different resin as the encapsulating resin.
- the double-encapsulated quantum dot composite is encapsulated with an encapsulating resin to block moisture or oxygen from the outside more effectively to prevent oxidation of the quantum dots or lifting of both ends of the film, thereby enhancing the light conversion efficiency of the quantum dots as well as increasing the life of the quantum dot film. Can increase.
- a non-polar polyolefin wax as described above may be used, and resins identical or similar to each other are used.
- the first encapsulation and the second encapsulation can be prepared in the manner of use mentioned above.
- the thickness is 0.1 to 10 ⁇ m, preferably 0.5 to 5 ⁇ m. Alternatively, it is used in an amount of 0.1 to 15 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the primary encapsulating resin. If the thickness or content is less than the above range, the probability that the quantum dot composite will not be encapsulated increases, resulting in a problem of poor reliability. On the contrary, if the thickness or content exceeds the above range, the quantum dot composite is produced as a wavelength conversion sheet and is placed on a display device to emit light. Since the problem of lowering the uniformity occurs, it is appropriately used within the above range.
- a photocurable composition including a photocurable polymerization compound and a photoinitiator is prepared in the quantum dot composite recovered in S1.
- the photocurable polymerization compound is used to prepare a matrix resin, and is selected from the above.
- the photoinitiator is for photocuring the photocurable polymer compound, and the same or similar to the photoinitiator described above is used. For example, if the photoinitiator and the photoinitiator are the same or similar to each other, photocuring can be performed with only one light irradiation, thereby simplifying the process.
- a quantum dot film is manufactured by irradiating the photocurable composition obtained in S2 with light.
- the photocurable composition is coated on a substrate and then a coating film is formed, followed by irradiation with light.
- the substrate can be a glass substrate or a plastic substrate.
- a plastic substrate is used, and more preferably may be a barrier film described later.
- the substrate may be a plate-type substrate, a tube-type substrate, or a substrate on which a light emitting diode is mounted, but is not limited thereto.
- the coating method is not particularly limited in the present invention, and a known wet coating method may be used.
- a method such as dip coating, flow coating, spray coating, roll coating, spin coating, or gravure coating may be used to form a thin and uniform coating film, but is not limited thereto.
- the thickness of the coating film can be set in consideration of the decrease in the thickness of the coating film after drying and photocuring, and is set to a thickness of 1.5 to 5 times the final thickness. Thus, the coating may be performed more than once.
- Drying can be performed by any method generally known in the art. Drying is not limited thereto, but may be performed by a hot air heating method or an induction heating method.
- the composition may be dried by hot air treatment at 40 to 80° C. for 10 to 50 seconds.
- the induction heating method it can be performed for 5 to 20 seconds with a frequency range of 1 to 50 MHz and power of 1 to 15 KW. Through this drying, moisture or solvent remaining in the film is completely removed. The moisture or solvent lowers the physical properties of the quantum dot film.
- the dried coating film has a structure in which the quantum dot composite is uniformly dispersed in the form of particles in a matrix resin made of a photocurable polymer compound. Light is irradiated here to simultaneously perform photocuring of the photocurable polymerization compound and the acrylic monomer in the quantum dot composite.
- Photocuring is performed by emitting active energy from a light source and irradiating the coating film.
- the light source in addition to rays such as far ultraviolet rays, ultraviolet rays, near ultraviolet rays, infrared rays, electromagnetic waves such as X-rays and ⁇ rays, electron rays, proton rays, neutron rays, etc. can be used, but curing speed, ease of acquisition of irradiation devices, Curing by UV irradiation is advantageous from the price and the like.
- a high-pressure mercury lamp As a light source for performing ultraviolet irradiation, a high-pressure mercury lamp, an electrodeless lamp, an ultra-high pressure mercury lamp, a carbon arc lamp, a xenon lamp, an LED lamp, a metal halide lamp, a chemical lamp, a black light, and the like are used.
- the high-pressure mercury lamp it is performed under conditions of, for example, about 5 mJ/cm 2 to about 3000 mJ/cm 2, specifically about 400 mJ/cm 2 to about 1500 mJ/cm 2.
- the irradiation time varies depending on the type of light source, the distance between the light source and the coating film, the thickness of the coating film, and other conditions. Usually, it may be several seconds to several tens of seconds, and in some cases, a few seconds.
- the quantum dot film prepared as described above has a structure in which quantum dots are dispersed in an acrylic polymer, which is encapsulated with a non-polar polyolefin-based wax, and the quantum dot composite is again uniformly dispersed in a matrix resin.
- the method according to the present invention can uniformly disperse the quantum dots at a high concentration in the matrix resin compared to the conventional process, and stable production through encapsulation is possible.
- the quantum dot film of the present invention manufactured by the above-described process technology includes 0.5 to 20 parts by weight, preferably 1 to 10 parts by weight, of the quantum dot composite particles based on 100 parts by weight of the matrix resin.
- the quantum dots have a range of 0.1 to 10 parts by weight, preferably 0.1 to 20 parts by weight of the encapsulating resin, and preferably 0.5 to 10 parts by weight.
- the content ratio of the matrix resin, the quantum dot and the encapsulating resin is designed in consideration of characteristics such as uniform dispersion of the quantum dots and light conversion efficiency, as well as light transparency and strength of the quantum dot film. If the content of the quantum dots is less than the above range, the light conversion effect is insignificant and the light conversion efficiency is lowered. If it is too much, there is a problem that uniform dispersion is difficult. In addition, if the content of the encapsulating resin is less than the above range, it is difficult to sufficiently enclose the quantum dots. Conversely, if the content of the encapsulating resin exceeds the above range, the transparency of the quantum dot film is lowered.
- the quantum dot film according to the present invention has a thickness of 50 to 300 ⁇ m, preferably 70 to 180 ⁇ m.
- a hydrophobic resin as an encapsulating resin
- quantum dots can be effectively protected from moisture and air.
- the acrylic resin used as the matrix resin has excellent adhesion to the substrate and the barrier film to be described later, and thus effectively prevents the penetration of moisture or oxygen from the outside to prevent oxidation of the quantum dots.
- the quantum dot composite can be dispersed in a high content (ie, high concentration) of 0.1 to 10 parts by weight, preferably 0.5 to 2 parts by weight, in the matrix resin, light conversion efficiency can be further increased.
- the quantum dot film may be applied to a wavelength conversion sheet for a display, and a screen of high color reproduction may be realized.
- the quantum dot film according to the present invention can be used as a wavelength conversion sheet.
- The'wavelength conversion sheet' referred to in this specification means a film capable of converting the wavelength of light emitted from a light source.
- the blue light is green light having a wavelength band between about 520 nm and about 560 nm and/or between about 600 nm and about 660 nm. It can be converted into red light having a wavelength band.
- the wavelength conversion sheet according to an embodiment of the present invention has a structure in which a quantum dot film is disposed between a pair of polymer films.
- the film is for supporting and protecting the quantum dot film, and more specifically, moisture or oxygen in the outside air is introduced into the quantum dot film to prevent oxidation of the quantum dot.
- the film may be a barrier film, and may be a pair of films made of a first barrier film and a second barrier film.
- the first and second barrier films may be the same or different from each other.
- the film may be a polymer film containing a polymer having a high barrier to moisture and/or oxygen, or a polymer film having a multilayer structure in which a barrier layer is formed thereon.
- the polymer film may be at least one selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), cyclic olefin copolymer (COC), and cyclic olefin polymer (COP), and preferably polyethylene terephthalate It may be a phthalate.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- COC cyclic olefin copolymer
- COP cyclic olefin polymer
- the barrier layer is an inorganic film or an organic-inorganic hybrid film on which In, Sn, Pb, Au, Cu, Ag, Zr, Hf, Zn. Al, Si, La, Ti, or metal containing Ni, oxides thereof, nitrides thereof, oxynitrides thereof, or may be one or more selected from oxyfluorides thereof, preferably silicon oxide (SiXOY), silicon carbide oxide (SiXCYOZ) , Silicon oxide nitride (SiXOYNZ) and aluminum oxide (AlXOY) may be one or more selected from the group consisting of.
- the inorganic film or the organic-inorganic hybrid film may be formed by various methods such as a sputtering process, a chemical vapor deposition process, or an evaporation method.
- the polymer film has a moisture permeability of about 10 -1 g/m 2 /day to 10 -3 g/m 2 /day under conditions of 37.8°C and 100% relative humidity, and air permeability under conditions of 23°C and 0% relative humidity It is preferable that it is about 10 -1 cc/m 2 /day/atm to 10 -2 cc/m 2 /day/atm.
- the linear transmittance of the polymer film is about 88% to 95% in the visible light region of 420nm to 680nm.
- the manufacturing of the wavelength conversion sheet according to the present invention can be prepared by using the above-mentioned photocurable composition between a pair of polymer films.
- the wavelength conversion sheet is applied on any one of a pair of photocurable polymer films to form a coating film, and the remaining polymer film is disposed on the coating film, and the coating film is cured by irradiating light. /Quantum dot coating layer/Polymer film is laminated to prepare a wavelength conversion sheet.
- the wavelength conversion sheet thus prepared has a total thickness of 70 ⁇ m to 300 ⁇ m and a haze of 5% to 45%.
- the wavelength conversion sheet of the present invention can be applied to a display.
- the wavelength conversion sheet may be applied to a backlight unit (BLU).
- BLU backlight unit
- about 2/3 of the light emitted from the backlight unit (BLU) is absorbed by a color filter, which is not good in terms of light conversion efficiency.
- the quantum dots in the film convert blue light, which is a backlight, to green and red, respectively, and part of the blue light is transmitted as it is to generate white light with high color purity.
- the viewing angle is improved due to the isotropic light emission characteristics of the quantum dots, and the response speed can be improved by reducing the thickness of the liquid crystal.
- the display is not particularly limited in the present invention, and a backlight unit (BLU) of a display device such as a TV, a monitor, a tablet, a smart phone, a personal digital assistant (PDA), a gaming device, an electronic reading device, or a digital camera.
- BLU backlight unit
- a display device such as a TV, a monitor, a tablet, a smart phone, a personal digital assistant (PDA), a gaming device, an electronic reading device, or a digital camera.
- the wavelength conversion sheet of the present invention may be used for indoor or outdoor lighting, stage lighting, decorative lighting, accent lighting, or museum lighting, and in addition to this, it may be used for special wavelength lighting required in horticulture or biology, but the lighting device is The use that can be applied is not limited to the above.
- a photocurable composition was prepared by performing the following steps, and then a wavelength conversion sheet was prepared using it.
- the temperature of the reactor was lowered to room temperature while stirring at 100 rpm to prepare an encapsulated quantum dot composite. At this time, it was confirmed that the isobornyl acrylate in the quantum dot composite was present in an uncured state as a result of FT-IR measurement.
- a photocurable composition was prepared by adding 0.01 g of a photoinitiator (irgacure 184) to 1.0 mg of the quantum dot composite prepared in (1) and 0.5 g of a urethane acrylate oligomer to a mixer, followed by stirring. Afterwards, toluene in the quantum dot complex was removed using a vacuum rotary concentrator.
- a photoinitiator irgacure 184
- the prepared photocurable composition was applied between a PET-based first barrier film (i-component, 50 ⁇ m) and a second barrier film (i-component, 50 ⁇ m), and applied to the coating film at a light amount of 1000 mJ/cm 2.
- a wavelength conversion sheet was prepared by curing by exposure to UV for 1 minute. At this time, the thickness of the quantum dot film including the quantum dot composite was 80 ⁇ m.
- a wavelength conversion sheet was prepared in the same manner as in Example 1, except that lauryl acrylate was used instead of isobornyl acrylate.
- a wavelength conversion sheet was prepared in the same manner as in Example 1, except that isobornyl acrylate/lauryl acrylate (1:1 weight ratio) was used instead of isobornyl acrylate.
- the silicone oil was thermally cured by applying a temperature at 80° C. for 35 minutes to obtain a dispersion in which the quantum dot composite was dispersed. At this time, it was confirmed that the isobornyl acrylate in the quantum dot composite was present in an uncured state as a result of FT-IR measurement.
- a photocurable composition was prepared by adding 0.01 g of a photoinitiator (irgacure 184) to 1.0 mg of the quantum dot composite prepared in (1) and 0.5 g of a urethane acrylate oligomer to a mixer, followed by stirring. Afterwards, toluene in the quantum dot complex was removed using a vacuum rotary concentrator.
- a photoinitiator irgacure 184
- the prepared curable composition was applied between a PET-based first barrier film (i-component, 50 ⁇ m) and a second barrier film (i-component, 50 ⁇ m), and applied to the coating film at a light amount of 1000 mJ/cm 2.
- a wavelength conversion sheet was prepared by exposure to UV for a minute and curing. At this time, the thickness of the quantum dot film including the quantum dot composite was 80 ⁇ m.
- UV-curable silicone UV 9300, manufactured by Momentive Performance Materials
- 0.06 ml of a quantum dot dispersion 1.2 mg of quantum dots
- 10 mg of isobornyl acrylate were added. , was injected into the reactor.
- the resulting composition was irradiated with ultraviolet rays to perform an encapsulation process by irradiating the silicone with ultraviolet rays. It was confirmed that the isobornyl acrylate in the obtained quantum dot composite was present in a UV-cured state as a result of FT-IR measurement.
- a photocurable composition was prepared by adding 0.01 g of a photoinitiator (irgacure 184) to 1.0 mg of the quantum dot composite prepared in (1) and 0.5 g of a urethane acrylate oligomer to a mixer, followed by stirring. Then, the solvent in the quantum dot composite was removed using a reduced pressure rotary concentrator.
- a photoinitiator irgacure 184
- the prepared curable composition was applied between a PET-based first barrier film (i-component, 50 ⁇ m) and a second barrier film (icomponent, 50 ⁇ m), and then applied to the coating film with a light amount of 1000 mJ/cm 2 for 1 minute. During exposure to UV light and curing to prepare a wavelength conversion sheet. At this time, the thickness of the quantum dot film including the quantum dot composite was 80 ⁇ m.
- TPO diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide
- the coating composition based on 100 parts by weight of urethane acrylate, 5 parts by weight of the capsule quantum dots were included.
- a coating layer was formed by coating the coating composition to a thickness of 80 ⁇ m on a first barrier film (i-component, Korea).
- a second barrier film substantially the same as the first barrier film was prepared, covered on the coating layer to contact the second barrier film, and irradiated with ultraviolet rays to cure the coating layer to form a wavelength conversion layer.
- polyethylene wax (trade name: Licowax PED 136, Clariant, Switzerland) as a wax-based compound in 100 ml of toluene
- the polyethylene wax was dissolved by raising the temperature to about 110°C to prepare a wax solution.
- a solution in which about 20 mg of CdSe-based quantum dots (trade name: Nanodot-HE, Power Logics, Korea) are dispersed in 1 ml of toluene is added to the wax solution, mixed, and then cooled to room temperature to disperse capsule quantum dots.
- CdSe-based quantum dots trade name: Nanodot-HE, Power Logics, Korea
- the solution was mixed with a urethane acrylate purchased from BASF (company name, Germany) and a photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO).
- TPO was mixed with about 0.8 parts by weight based on 100 parts by weight of urethane acrylate.
- toluene was removed using a vacuum rotary concentrator to prepare a coating composition in which urethane acrylate, encapsulated quantum dots, and photoinitiator were mixed.
- the coating composition based on 100 parts by weight of urethane acrylate, about 5 parts by weight of the capsule quantum dots were included.
- a coating layer was formed by coating a coating composition in which a urethane acrylate, a capsule quantum dot and a photoinitiator were mixed on a first barrier film (i-component, Korea) to a thickness of about 80 ⁇ m.
- a second barrier film substantially the same as the first barrier film was prepared, covered on the coating layer to contact the second barrier film, and irradiated with ultraviolet rays to cure the coating layer to form a wavelength conversion layer.
- the quantum efficiency of the wavelength conversion sheet prepared according to the present invention is higher than that of the wavelength conversion sheet of the comparative example.
- Quantum efficiency is related to the compatibility between the matrix and the quantum dots, and when the quantum dots are aggregated in the matrix, a quenching phenomenon due to this aggregation phenomenon is caused, resulting in a problem of a decrease in quantum efficiency.
- Low quantum efficiency degrades color purity, making it difficult to achieve a desired color when applied to a display.
- the wavelength conversion sheet prepared in Examples 1 to 4 of the present invention exhibits a high quantum efficiency of at least 89% or more because the quantum dots are uniformly distributed throughout the matrix without aggregation, and high color purity can be exhibited when applied to a display.
- BEF, 3M luminance enhancing films
- DBEF, 3M reflective polarizing film
- CIE 1931 color coordinates and luminance were measured using a spectroradiometer (trade name: CS-2000, KONICA MINOLTA, Japan).
- the quantum dot composite, quantum dot film, and wavelength conversion sheet having the same according to the present invention can be applied to a display.
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Abstract
Description
구분 | 양자 효율(%) |
실시예 1 | 93% |
실시예 2 | 90% |
실시예 3 | 92% |
실시예 4 | 89% |
실시예 5 | 90% |
비교예 1 | 85% |
비교예 2 | 87% |
구분 | 색좌표 CIE 1931 (x, y) | 휘도 (nit) | 광전환 효율 |
실시예 1 | (0.2230, 0.2092) | 8514 | 68% |
실시예 2 | (0.2225, 0.2082) | 8322 | 62% |
실시예 3 | (0.2243, 0.2091) | 8425 | 65% |
실시예 4 | (0.2235, 0.2107) | 8251 | 61% |
실시예 5 | (0.2222, 0.2088) | 8342 | 63% |
비교예 1 | (0.2195, 0.2071) | 7431 | 53% |
비교예 2 | (0.2184, 0.2087) | 7553 | 57% |
Claims (21)
- 아크릴계 단량체 또는 이의 중합체 내에 양자점이 분산되고,이를 캡슐화 수지로 캡슐화한 양자점 복합체.
- 제1항에 있어서,상기 아크릴계 단량체는 미경화된 액상 성상이며, 상기 중합체는 아크릴계 단량체가 광경화된, 양자점 복합체.
- 제1항에 있어서,상기 아크릴계 단량체는 이소보닐(메트)아크릴레이트, 이소옥틸(메트)아크릴레이트, 라우릴(메트)아크릴레이트, 스테아릴(메트)아크릴레이트, 벤질(메트)아크릴레이트, 노보닐(메트)아크릴레이트, 이소데실(메트)아크릴레이트, 사이클로헥실(메트)아크릴레이트, n-헥실(메트)아크릴레이트, 아다만틸 아크릴레이트, 아크릴로일모폴린, 테트라히드로퓨릴(메트)아크릴레이트, 2-페녹시에틸(메트)아크릴레이트, 카프로락톤(메트)아크릴레이트 및 사이클로펜틸 아크릴레이트로 이루어진 군에서 선택된 1종 이상인, 양자점 복합체.
- 제1항에 있어서,상기 캡슐화 수지는 하기 화학식 1 및 화학식 2의 반복 구조를 갖는 비극성 폴리올레핀계 왁스인, 양자점 복합체.[화학식 1]-[CH2-CH2]a-[화학식 2]-[CH2-CHR1]b-(상기 화학식 1 및 2에서, R1은 C1 내지 C15의 선형 또는 분지형의 알킬기이고, 0.01≤b≤0.96이고, a+b=1을 만족한다.)
- 제1항에 있어서,상기 캡슐화 수지는 자외선 경화형 실리콘계 수지인, 양자점 복합체.
- 제1항에 있어서,상기 캡슐화 수지는 열 경화형 실리콘계 수지인, 양자점 복합체.
- 제1항에 있어서,상기 양자점 복합체 및 매트릭스 수지 중 어느 하나 이상의 상에 세라믹 나노 입자를 더욱 포함하는, 양자점 복합체.
- 제1항 내지 제7항 중 어느 한 항에 따른 양자점 복합체가 매트릭스 수지 내 분산된 양자점 필름.
- 제8항에 있어서,상기 매트릭스 수지는 아크릴계 올리고머, 아크릴계 단량체 및 이들의 조합으로 이루어진 군에서 선택된 1종의 광경화성 중합 화합물이 광경화된 것인, 양자점 필름.
- 제8항의 양자점 필름이 한 쌍의 고분자 필름 사이에 개재된 파장변환 시트.
- 제10항에 있어서,상기 고분자 필름은 폴리에틸렌테레프탈레이트, 폴리에틸렌나프탈레이트, 환형 올레핀 공중합체, 및 환형올레핀 중합체로 이루어진 군에서 선택된 1종 이상을 포함하는 파장변환 시트.
- 제11항에 있어서,추가로 상기 고분자 필름 상에 In, Sn, Pb, Au, Cu, Ag, Zr, Hf, Zn. Al, Si, La, Ti 또는 Ni를 포함하는 금속, 이의 산화물, 이의 질화물, 이의 산질화물 및 이의 산불화물로 이루어진 1종의 배리어층이 형성된, 파장변환시트.
- a1) 계면활성제가 제1용매에 분산된 분산액을 제조하는 단계,b1) 상기 분산액에 하기 화학식 1 및 화학식 2의 반복 구조를 갖는 비극성 폴리올레핀계 왁스, 양자점, 아크릴계 단량체, 광개시제 및 제2용매를 첨가하는 단계,c1) 얻어진 조성물을 가온 후 냉각하여 상기 비극성 폴리올레핀계 왁스의 고상화에 의해 양자점을 캡슐화하는 단계, 및d1) 여과 후 캡슐화된 양자점 복합체를 회수하는, 양자점 복합체의 제조방법.[화학식 1]-[CH2-CH2]a-[화학식 2]-[CH2-CHR1]b-(상기 화학식 1 및 2에서, R1은 C1 내지 C15의 선형 또는 분지형의 알킬기이고, 0.01≤b≤0.96이고, a+b=1을 만족한다.)
- a2) 액상의 자외선 경화형 실리콘계 수지, 양자점, 아크릴계 단량체, 광개시제를 혼합하는 단계,b2) 계면활성제가 제1용매에 분산된 분산액을 제조하는 단계,c2) 상기 분산액에 혼합된 액상의 자외선 경화형 실리콘계 수지, 양자점, 아크릴계 단량체, 광개시제 및 제2용매를 첨가하는 단계,d2) 얻어진 조성물에 자외선을 조사하여 실리콘계 수지로 양자점, 아크릴계 단량체, 개시제를 캡슐화하는 단계, 및e2) 여과 후 캡슐화된 양자점 복합체를 회수하는, 양자점 복합체의 제조방법.
- a3) 액상의 열경화형 실리콘계 수지, 양자점, 아크릴계 단량체, 광개시제를 혼합하는 단계,b3) 계면활성제가 제1용매에 분산된 분산액을 제조하는 단계,c3) 상기 분산액에 액상의 열경화형 실리콘계 수지, 양자점, 아크릴계 단량체, 광개시제 및 제2용매를 첨가하는 단계,d3) 얻어진 조성물에 열을 인가하여 실리콘계 수지를 경화시키켜 양자점, 아크릴계 단량체, 광개시제를 캡슐화하는 단계, 및e3) 여과 후 캡슐화된 양자점 복합체를 회수하는, 양자점 복합체의 제조방법.
- 제13항 내지 제15항 중 어느 한 항에 있어서,d1) 단계 이전, e2) 단계 이전 및 e3) 단계 이전에 자외선을 조사하는 단계를 수행하여, 아크릴계 단량체를 경화하는 단계를 수행하는, 양자점 복합체의 제조방법.
- 제13항 내지 제15항 중 어느 한 항에 있어서,상기 제1용매는 극성 용매이고, 제2용매는 비극성 용매인, 양자점 복합체의 제조방법.
- 제17항에 있어서,상기 극성 용매는 물; 메탄올, 에탄올, 프로판올, 이소프로판올, 및 부탄올을 포함하는 저급 알코올 중에서 선택된 1종 이상인, 양자점 복합체의 제조방법.
- 제17항에 있어서,상기 비극성 용매는 펜탄, 헥산, 헵탄, 옥탄, 데칸, 사이클로로헥산 및 이소파라핀을 포함하는 지방족 탄화수소계 용매; 톨루엔, 벤젠, 디클로로벤젠 및 클로로벤젠을 포함하는 방향족 탄화수소계 용매; 테트라히드로푸란, 1,4-디옥산, 및 디에틸에테르를 포함하는 에테르계 용매; 염화메틸렌 및 이들의 조합으로 이루어진 군에서 선택된 1종 이상인, 양자점 복합체의 제조방법.
- (S1) 제13항 내지 제15항 중 어느 한 항에 의해 양자점 복합체를 제조하는 단계;(S2) 상기 양자점 복합체, 광경화성 중합 화합물 및 광개시제를 혼합하여 광경화성 조성물을 제조하는 단계; 및(S3) 얻어진 광경화성 조성물을 코팅 후 광조사하여 광경화를 수행하는 단계를 포함하는, 양자점 필름의 제조방법.
- 제20항에 있어서,상기 광경화성 중합 화합물은 아크릴계 올리고머, 아크릴계 단량체 및 이들의 조합으로 이루어진 군에서 선택된 1종을 포함하는, 양자점 필름의 제조방법.
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