WO2016122286A1 - 광전환 소자 및 이를 포함하는 디스플레이 장치 - Google Patents
광전환 소자 및 이를 포함하는 디스플레이 장치 Download PDFInfo
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- WO2016122286A1 WO2016122286A1 PCT/KR2016/001090 KR2016001090W WO2016122286A1 WO 2016122286 A1 WO2016122286 A1 WO 2016122286A1 KR 2016001090 W KR2016001090 W KR 2016001090W WO 2016122286 A1 WO2016122286 A1 WO 2016122286A1
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- light
- light conversion
- conversion film
- film
- transparent substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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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
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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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
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/88—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing selenium, tellurium or unspecified chalcogen elements
- C09K11/881—Chalcogenides
- C09K11/883—Chalcogenides with zinc or cadmium
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
- H01L33/504—Elements with two or more wavelength conversion materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
- H01L33/52—Encapsulations
- H01L33/56—Materials, e.g. epoxy or silicone resin
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2113/00—Combination of light sources
- F21Y2113/10—Combination of light sources of different colours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1204—Optical Diode
- H01L2924/12041—LED
Definitions
- the present invention relates to an optical switching element and a display device.
- a phosphor is a light emitting material that absorbs energy in the form of light or electricity from the outside and emits light having a unique wavelength, and may be used as an inorganic phosphor, an organic fluorescent dye, or a nanocrystalline phosphor according to a component and a light emitting device constituting the phosphor. Can be distinguished.
- the phosphor absorbs a part of a specific wavelength of light from the light source and converts the light into a light having a longer wavelength in the visible range, and emits light.
- the brightness, color purity, and color reproducibility of the light emitted according to the light emission characteristics of the phosphor are emitted. It can greatly improve.
- the inorganic phosphor is composed of a matrix of sulfides, oxides, nitrides, and activators, and has excellent physical and chemical stability and can reproduce high color purity, so that it can be applied to high quality display devices, but the phosphor is very expensive and its luminous efficiency is low.
- Nanocrystalline phosphors composed of group II-IV or III-V semiconductor particles of several nanometers in size have different fluorescence wavelengths depending on the size of the particles, unlike organic fluorescent dyes. By adjusting the size, the visible light region of the desired wavelength can be expressed.
- the nanocrystalline phosphor since the nanocrystalline phosphor has a light absorption coefficient of 100 to 1000 times higher and a higher quantum efficiency than a general organic dye, it generates very strong fluorescence, and especially since only the transition from the bottom vibration state of the conduction band to the bottom vibration state of the valence band is observed. The wavelength shows almost monochromatic light. However, due to high raw material costs, it is difficult to secure price competitiveness, and in particular, it is vulnerable to heat or oxygen.
- organic fluorescent dyes have a variety of emission spectrum, excellent quantum efficiency, and especially low cost compared to inorganic phosphors, so it is worth using as an optical conversion device.
- organic fluorescent dyes have a variety of emission spectrum, excellent quantum efficiency, and especially low cost compared to inorganic phosphors, so it is worth using as an optical conversion device.
- Embodiments of the present invention provide an optical conversion element having excellent durability and conversion efficiency, including an organic fluorescent dye, and a display device including the same.
- the light source And a light conversion film provided on one surface of the light source, wherein the light conversion film comprises a first light conversion film including one or more organic fluorescent dyes, and a first light conversion film disposed closer to the light source than the first light conversion film. And a second light conversion film including the above organic fluorescent dye, wherein the maximum light emission wavelength of the second light conversion film is shorter than the maximum light emission wavelength of the first light conversion film when light is emitted from the light source.
- the first and second light conversion films may convert light incident from a light source such as a light emitting diode (LED) into white light by converting light from a light source into light having a different wavelength.
- a light source such as a light emitting diode (LED)
- the surface facing the light source of the first light conversion film may further include a transparent substrate provided on a surface opposite to the first light conversion film facing the first light conversion film.
- the transparent substrate further includes a barrier film or a barrier film provided on at least one surface of the first or second light conversion film.
- the barrier film includes a barrier layer that blocks the first or second light conversion film from external moisture or oxygen.
- the barrier layer is not particularly limited as long as it can block moisture or oxygen, and those known in the art may be used.
- the barrier film may include a barrier layer having a transmittance of at least one of moisture and oxygen of 10 ⁇ 1 cc / m 2 / day or less.
- the barrier layer may include aluminum oxide or nitride that imparts moisture or oxygen barrier, and ionic metal oxide.
- the barrier film may further include a buffer layer made of at least one selected from a sol-gel, acrylic, epoxy, and urethane-based coating solution composition. The above-described transparent substrate provided on one surface of the light conversion film may serve as the buffer layer.
- the barrier film may include a protective coating layer including an inorganic-inorganic hybrid coating layer, an inorganic layer, and inorganic nanoparticles surface-modified with an organosilane provided on one or both surfaces of the substrate.
- the inorganic layer may be formed of a metal oxide or a nitride.
- the inorganic nanoparticles may be nanoparticles of alumina, silica, zinc oxide, antimony oxide, titanium oxide, zirconium oxide.
- the organic-inorganic hybrid coating layer may be formed by curing the coating composition of the sol state containing the organosilane by heat or UV, and the coating solution composition of the sol state is optionally in combination with the organosilane, appropriate additives, solvents, Polymerization catalysts and the like.
- the laminated structure of the first or second light conversion film and the barrier film may be formed by applying the composition for forming the light conversion film on the barrier film, or attaching the light conversion film and the barrier film with an adhesive or an adhesive. After application of the composition, curing or drying may be performed as necessary.
- the barrier film includes a buffer layer and a barrier layer
- the first or second light conversion film may be disposed to contact the barrier layer of the barrier film.
- a barrier film may be provided between the first or second light conversion film and the transparent substrate.
- the transparent substrate may serve as a buffer layer of the barrier film.
- the transparent substrate may serve as a buffer layer of the barrier film.
- the transparent substrate, the barrier layer, and the first or second light conversion film may be formed in a stacked structure.
- a barrier film may be provided on a surface opposite to a surface of the first or second light conversion film that faces the transparent substrate.
- the first or second light conversion film and the barrier film can be attached by forming an adhesive or an adhesive layer between the first or second light conversion film and the barrier film.
- the barrier film may include a transparent substrate as a barrier layer and a buffer layer.
- the first or second light conversion film, the pressure-sensitive adhesive or adhesive layer, the barrier layer and the transparent substrate may be formed in a stacked structure.
- the first light conversion film and the second light conversion film may each include a barrier film provided on the opposite side of the surface facing each other. Description of the barrier film provided on each side of the light conversion film may be applied to the structure of each barrier film formed on both sides of the light conversion film.
- the light conversion element may include light diffusing particles for diffusing the light incident from the light source into the first or second light conversion film.
- the light diffusing particles may be dispersed in a polymer medium including one or more organic fluorescent dyes.
- the first or second light conversion film including the light diffusing particles is capable of fluorescence diffusion as well as light conversion, and may be referred to as a first or second light conversion fluorescence diffusion film.
- the light conversion film including the light diffusion particles may be referred to as a light conversion fluorescence diffusion film.
- the light diffusing particles are to increase the light conversion efficiency of the first or second light conversion film, and may include TiO 2 , silica nanoparticles, but are mixed with one or two or more kinds of materials known in the art. Can be used.
- the average particle diameter of the light diffusing particles may be 50 nm or less.
- the light diffusing particles may be used in 0.5 to 5% by weight based on the weight of the polymer medium.
- a barrier film may be provided on at least one surface of the first or second light conversion fluorescent diffusion film.
- the light conversion fluorescence diffusion film may be formed on the barrier film to form a light conversion fluorescence diffusion film.
- a separate barrier film may be attached onto the first or second light conversion fluorescent diffusion film by using an adhesive or an adhesive layer. Description of the barrier film may be applied to the content described in the above-described first or second light conversion film.
- the light conversion element may further include a light extraction plate provided on the opposite surface of the transparent substrate facing the first or second light conversion film.
- the transparent substrate may be a barrier film.
- the light extraction plate and the transparent substrate may be attached by an adhesive or an adhesive.
- the light extracting plate and the transparent substrate may be laminated by an adhesive or adhesive layer provided on an opposite surface of the transparent substrate opposite to the first or second light conversion film.
- the light conversion element may further include a light extraction plate for extracting light emitted from the light incident from the light source is converted through the first and second light conversion film.
- a light extraction plate for extracting light emitted from the light incident from the light source is converted through the first and second light conversion film.
- the adhesive / adhesive layer formed on the other surface of the barrier film or the transparent substrate provided with the first or second light conversion film may be laminated with one surface of the light extraction plate.
- the light extraction plate may be included instead of the above-mentioned light diffusing particles, or may be included simultaneously with the light diffusing particles as necessary.
- the light extraction plate may include two or more materials having a scattering structure on the surface or inside, or having different refractive indices therein, in order to improve light extraction efficiency.
- the light extraction layer may be prepared by coating a composition including scattering particles and a binder on a transparent substrate, and drying or curing. If necessary, a planarization layer may be further provided on the coating layer including the scattering particles and the binder.
- the light extraction layer may be prepared by forming an uneven structure through microembossing on a transparent substrate. If necessary, a planarization layer may be further provided on the uneven structure.
- the color purity is improved by converting light incident from a light source including a wavelength selected from near-ultraviolet light into a light having a specific wavelength (color) through a light conversion film including an organic fluorescent dye.
- a light conversion film including an organic fluorescent dye can be improved.
- light incident from a single color LED light source into white light through a light conversion film including at least two or more different light emitting wavelengths, for example, green and red organic fluorescent dyes color reproducibility and color purity of white light can be improved. have.
- the maximum light emission wavelength of the first light conversion film disposed relatively far from the light source is longer than the second light conversion film disposed relatively close to the light source, not only the second light conversion but also some of the light emitted from the light source Since a part of the light converted by the film can be converted again by the first light conversion film, the light conversion efficiency can be further increased, thereby increasing the brightness of the light passing through both the first and second light conversion film. have.
- the light conversion film between the barrier film can effectively block the penetration of external moisture or oxygen into the film, the light emission wavelength, FWHM (Full Width at Half) when the incident light is converted to a specific wavelength (color) Optical characteristics such as Maximum), conversion efficiency (quantum efficiency), etc. can be maintained invariably, and thus the service life can be increased and the luminance and color coordinates of the white light can be kept constant.
- 1 to 11 illustrate the stacked structure of the light conversion element according to the exemplary embodiments of the present application.
- FIG. 13 compares the white color coordinate values obtained from the spectral spectrum of the optical conversion device of Example 1 with the CIE 1976 coordinates (triangles) and the white color coordinate values (circles) of 3M's QDEF film.
- FIG. 14 shows the spectral spectrum of the light conversion device of Example 2.
- FIG. 15 is a result of showing white color coordinate values obtained from a spectral spectrum of the light conversion device of Example 2 in CIE 1976 coordinates.
- FIG. 15 is a result of showing white color coordinate values obtained from a spectral spectrum of the light conversion device of Example 2 in CIE 1976 coordinates.
- Figure 16 shows the spectral spectrum of the light conversion device of Comparative Example 1.
- FIG. 17 shows the white color coordinate values obtained from the spectral spectrum of the light conversion device of Comparative Example 1 in the CIE 1976 coordinates.
- An optical switching device the light source; And a light conversion film provided on one surface of the light source, wherein the light conversion film comprises a first light conversion film including one or more organic fluorescent dyes, and a first light conversion film disposed closer to the light source than the first light conversion film. And a second light conversion film including the organic fluorescent dye as described above, wherein the maximum light emission wavelength of the second light conversion film is shorter than the maximum light emission wavelength of the first light conversion film when irradiated with light from the light source.
- 1 illustrates a laminated structure of an optical switching device according to an exemplary embodiment of the present application. According to FIG.
- a light conversion film is provided on one surface of a light source, and the light conversion film includes a transparent substrate and a first light conversion film and a second light including one or more organic fluorescent dyes provided on the transparent substrate. Conversion film.
- the transparent substrate is shown in contact with the second light conversion film, but the transparent substrate may be disposed in contact with the first light conversion film.
- the transparent substrate may include a resin such as PET, but is not limited thereto.
- the first light conversion film and the second light conversion film are shown in contact with each other, but an adhesive layer or an adhesive layer may be provided between them.
- the first or second light conversion film of the light conversion element may further include one or more organic fluorescent dyes and light diffusion particles for diffusing light incident from the light source into the light conversion film.
- the first or second light converting film comprising the light diffusing particles may be referred to as a first or second light converting fluorescence diffusing film.
- the light diffusion particles may include TiO 2 or silica particles, but are not limited thereto. The structure of the light conversion element including the first or second light conversion film including the light diffusion particles is illustrated in FIG. 2.
- the light conversion element may include a light extraction plate in place of the light diffusion particles for diffusing light incident on the first or second light conversion film in the light conversion film.
- the light conversion element may include a first and second light conversion films including at least one organic fluorescent dye, provided on one surface of the transparent substrate, and an adhesive / adhesive layer formed on the other surface of the transparent substrate. It may include a light extraction plate laminated by, a structure including a light extraction plate is illustrated in FIG.
- the light extraction plate is not particularly limited as long as it is known in the art to increase the conversion efficiency of the light conversion film.
- the transparent substrate and the light extraction plate are disposed in contact with the second light conversion film.
- the transparent substrate and the light extraction plate may be disposed in contact with the first light conversion film as needed.
- a second light conversion film, a first light conversion film, a transparent substrate, an adhesive layer (or an adhesive layer), and a light extraction plate may be sequentially stacked on the light source.
- the light conversion film and / or light conversion fluorescence diffusion film serves to convert light incident from a light source including a wavelength (color) selected in the visible light region in the near ultraviolet ray into light having a specific wavelength (color).
- the light conversion film may play a role of converting the light incident from the LED light source into white light and emitting the light.
- the light conversion film and / or the light conversion fluorescence diffusion film may include an organic fluorescent dye that can implement excellent color purity and color reproducibility.
- Organic fluorescent dyes have a high quantum efficiency compared to conventional quantum dots (QD), easy to control the desired light emission wavelength, has a light emission line width to achieve excellent color reproduction rate, and has a low price advantage.
- the organic fluorescent dye absorbs light selected from the visible region in the near ultraviolet, and a dye which emits light having a wavelength different from the absorbed light may be used.
- the organic fluorescent dye includes at least one green emitting fluorescent dye having a maximum emission wavelength of 500 to 550 nm and / or at least one red emitting fluorescent dye having a maximum emission wavelength of 600 to 660 nm. Or may be used simultaneously.
- organic fluorescent dyes are preferably acridine-based, xanthene-based, arylmethane-based, coumarin-based, polycyclic aromatic hydrocarbon-based, polycyclic heteroaromatic-based, perylene-based, pyrrole-based, pyrene-based derivatives, and the like. .
- the above materials may be used in various organic fluorescent dyes in addition to one example of an organic fluorescent dye, but is not limited thereto.
- the organic fluorescent dye may have a half width (FWHM) of 60 nm or less and a molecular absorption coefficient of 50,000 to 150,000 M ⁇ 1 cm ⁇ 1 .
- the half width means the width of the light emission peak when the light absorbed from the external light source is converted to light having a different wavelength to emit light, and is half of the maximum height of the light emitted.
- the full width at half maximum is measured in a film state.
- the half width of the luminescence peak in the film state of the organic fluorescent dye is not a solution state, but is irradiated with light in a state in which the organic fluorescent dye is prepared in the form of a film by mixing alone or with other components that do not affect measuring the half width. It means the measurement. More preferably, all fluorescent dyes dissolved in polar solvents are possible, and cationic, anionic, or organic dyes are not preferred, but cationic or anionic organic fluorescent dyes are more preferred.
- the first light conversion film comprises a red light emitting dye having a maximum emission wavelength of 600 ⁇ 660 nm
- the second light conversion film is a green light having a maximum emission wavelength of 500 ⁇ 550 nm Luminescent fluorescent dyes.
- the light conversion film and / or light conversion fluorescence diffusion film may be a polymer film in which the organic fluorescent dye and / or light diffusion particles are dispersed.
- the light conversion film may include a cured product of the organic fluorescent dye, a binder resin, and a composition including a polymerizable monomer and a polymerization initiator, if necessary.
- a binder resin a photocurable resin, a thermosetting resin, a thermoplastic resin, or the like may be used, and it is preferable to use a water-soluble polymer. Only one kind of binder resin may be used, but two or more kinds may be used together.
- the light conversion film and / or the light conversion fluorescence diffusion film may be formed on the barrier film including the barrier layer (FIGS. 4 and 5).
- the transparent substrate may serve as a buffer layer of the barrier layer. If necessary, an additional buffer layer may be provided, or the transparent substrate may be omitted.
- 4 and 5 illustrate a structure in which the barrier layer and the transparent substrate are in contact with the second light conversion film, but the barrier layer and the transparent substrate may be disposed in contact with the first light conversion film as necessary.
- a second light conversion film, a second light conversion film, a barrier layer, and a transparent substrate may be stacked on a light source, and the transparent substrate may be omitted.
- the light conversion film and / or the light conversion fluorescence diffusion film may be laminated with a separate barrier film including a barrier layer by an adhesive / adhesive layer (FIGS. 6 and 7).
- the transparent substrate may serve as a buffer layer of the barrier layer. If necessary, an additional buffer layer may be provided, or the transparent substrate may be omitted.
- the barrier layer as described in FIGS. 4 to 7 serves to block outside moisture and oxygen from penetrating into the film.
- a light conversion film containing an organic fluorescent dye receives light from a light source at a high temperature of room temperature or more and converts it into light having a different wavelength (color), it penetrates into the film and reacts with oxygen or moisture present in the film to detect the wavelength, FWHM The conversion efficiency may change over time.
- a barrier film is laminated on one or both surfaces of the light conversion film in order to prevent a change in optical properties of the film.
- the first light conversion film and the second light conversion film may each include a barrier film provided on the opposite side of the surface facing each other.
- the permeability of oxygen and moisture of the barrier layer may be, for example, 10 ⁇ 1 cc / m 2 / day or less. This is referred to as an example of the barrier film, the oxygen and moisture permeability of the barrier layer may have a different value.
- the light conversion film may include a light extraction plate instead of the light diffusion particles to increase the conversion efficiency of the light conversion film. Accordingly, the light conversion film is formed by the first and second light conversion films including the transparent substrate, at least one organic fluorescent dye applied on the transparent substrate, and an adhesive / adhesive layer formed on the other surface of the transparent substrate. It may include a stacked light extraction plate (Fig. 8). In addition, the light conversion film may be laminated with a separate barrier film including a barrier layer by an adhesive layer or an adhesive layer (FIG. 9). 8 and 9, the transparent substrate may serve as a buffer layer of the barrier layer.
- the first light conversion film or the first light conversion fluorescent diffusion film and the second light conversion film or the second light conversion fluorescent diffusion film may be disposed apart from each other. It may be arranged in contact.
- another film may be interposed between the light conversion films or the light conversion fluorescent diffusion films.
- the second light conversion film or the second light conversion fluorescent diffusion film may be stacked and disposed by an adhesive layer or an adhesive layer provided on the first light conversion film or the first light conversion fluorescent diffusion film.
- the first and second light conversion film may include a light extraction plate in place of the light diffusion particles to increase the conversion efficiency of the light conversion film.
- 10 illustrates a laminated structure of the light extraction plate.
- 1 to 11 respectively show a structure including two light conversion films and two light conversion fluorescent diffusion films, but may include three or more films as necessary.
- the composition for producing a light conversion film includes an organic fluorescent dye, light diffusing particles, a binder resin, a polymerizable monomer and a polymerizable initiator as necessary.
- the polymerizable monomer may be used 10 to 30% by weight of the binder resin.
- the organic fluorescent dye may be used in 0.001 to 5% by weight of the binder resin.
- the amount of the polymerizable initiator may be determined according to need, and may be used in an amount of 0.01 to 20% by weight based on the weight of solids of the entire composition.
- the composition for preparing the light conversion film may further include a solvent, if necessary, for example, water may be used as the solvent when the binder resin is water-soluble.
- the composition for preparing a light conversion film is preferably used by dissolving in a solvent such as water so that the solid content of the total solution of the composition is 10 to 40% by weight.
- polyvinyl alcohol poly (vinylalcohol)
- polyallylamine polyallyamine
- PAA polyallylamine
- PAH polyallylamine hydrochloride
- the polyvinyl alcohol is polyvinyl alcohol having a weight average molecular weight (Mw) of 85,000 to 146,000, preferably hydrolyzed to 96% or less.
- the polyallylamine preferably has a weight average molecular weight (Mw) of 58,000 to 900,000.
- the polymerizable monomer is more preferably glycidyl (glycidyl), but is not limited to this, aldehyde (aldehyde), dialdehyde (dialdehyde), isocyanate (isocynate), alcohol (alcohol) and the like Can be used.
- the composition may be applied onto a transparent substrate, and then curing or drying may be performed as necessary.
- the curing method and conditions may be determined according to the type of binder resin or other components.
- the transparent substrate may include a resin such as PET, but is not limited thereto, and a transparent plastic film or substrate known in the art may be used.
- the light source is an edge type light source, and may further include a light guide plate provided between the light source and the light conversion film.
- the light guide plate diffuses the light received from the edge type light source.
- the light source is a direct type light source.
- the backlight unit may have a configuration known in the art except for the light conversion element.
- a reflecting plate may be provided on an opposite surface of the light source or the light guide plate that faces the light conversion element, and a light collecting sheet, a brightness enhancement sheet, or the like may be further provided on the opposite side of the light conversion film that faces the light source or the light guide plate. It may be provided.
- the display apparatus may have a configuration known in the art, except for using the optical switching element according to the above-described embodiments of the present application.
- the display module may include a display module provided on one surface of the light conversion element or the backlight unit.
- the display module may be a liquid crystal module including a thin film transistor and a color filter.
- composition prepared by stirring by adding 0.1 parts by weight of sulfodadamine 101 and a titanium oxide light diffusing agent to 100 parts by weight of PVA was dried on the green light conversion film and applied to a thickness of 10 micrometers, and then 100 ° C. Hot air drying for 10 minutes in a drying oven to prepare a white light conversion film.
- the green light conversion film was disposed to be close to the blue light source, and then the spectral spectrum of FIG. 12 was obtained by using a PR-705 spectra scanning device.
- the result of comparing the white color coordinate value obtained from the spectral spectrum of the optical conversion device to the CIE 1976 coordinate (triangle) and the white color coordinate value (circle) of 3M's QDEF film is shown in FIG. 13.
- SAN Styrene-acrylonitrile copolymer
- BODIPY pyrrole-based green fluorescent dyes
- a composition prepared by stirring by adding 0.03 parts by weight of pyrrole-based red fluorescent dye and 3 parts by weight of titanium oxide-based light diffusing agent to 100 parts by weight of SAN was dried on the green light conversion film, and then having a thickness of 10 microns. After coating to a meter, a hot air drying for 15 minutes in a 140 °C drying oven to prepare a white light conversion film.
- the green light conversion film was disposed to be close to the blue light source, and then the spectral spectrum of FIG. 14 was obtained by using a PR-705 spectra scan device.
- a red fluorescent dye composition was first applied on a plastic substrate to produce a red light conversion film, and a green fluorescent dye was applied to the red light conversion film to produce a white light conversion device. After that, the red light conversion film was placed close to the blue light source, and then the spectral spectrum of FIG. 16 was obtained using a PR-705 spectra scan equipment. White color coordinate values obtained from the spectral spectrum of the light conversion device are shown in Figure 17 the CIE 1976 coordinates.
Abstract
Description
Claims (10)
- 광원; 및 광원의 일면에 구비된 광전환 필름을 포함하고, 상기 광전환 필름은 1 종 이상의 유기형광염료를 포함하는 제1 광전환 필름, 및 상기 제1 광전환 필름 보다 광원에 가깝게 배치되고 1종 이상의 유기형광염료를 포함하는 제2 광전환 필름을 포함하고, 광원으로부터 광 조사시 제2 광전환 필름의 최대 발광 파장이 제1 광전환 필름의 최대 발광 파장보다 더 짧은 것을 특징으로 하는 광전환 소자.
- 청구항 1에 있어서, 상기 제2 광전환 필름은 최대 발광파장이 500~550 nm 사이에 존재하는 녹색 발광 형광염료를 포함하고, 상기 제1 광전환 필름은 최대 발광파장 600~660 nm 사이에 존재하는 적색 발광 형광염료를 포함하는 것인 광전환 필름.
- 청구항 1에 있어서, 상기 유기형광염료는 반치폭(FWHM)이 60 nm 이하이고 몰흡광계수(molecular absorption coefficient)가 50,000~150,000 M-1cm- 1 인 것인 광전환 필름.
- 청구항 1에 있어서, 상기 제1 광전환 필름의 광원에 대향하는 면; 또는 상기 제2 광전환 필름의 제1 광전환 필름에 대향하는 면의 반대면에 구비된 투명 기판을 더 포함하는 광전환 소자.
- 청구항 4에 있어서, 상기 투명 기판이 배리어 필름이거나, 상기 제1 또는 제2 광전환 필름의 적어도 일면에 구비된 배리어 필름이 추가로 구비되는 것인 광전환 소자.
- 청구항 1에 있어서, 상기 제1 또는 제2 광전환 필름은 광확산 입자를 더 포함하는 것인 광전환 소자.
- 청구항 1에 있어서, 상기 제1 광전환 필름 및 상기 제2 광전환 필름이 각각 서로 대향하는 면의 반대면에 각각 구비된 배리어 필름을 더 포함하는 광전환 소자.
- 청구항 4에 있어서, 상기 투명 기판의 상기 광전환 필름에 대향하는 면의 반대면에 구비된 광추출판을 더 포함하는 광전환 소자.
- 청구항 1 내지 8 중 어느 한 항에 따른 광전환 소자를 포함하는 백라이트 유닛.
- 청구항 1 내지 8 중 한 항에 따른 백라이트 유닛을 포함하는 디스플레이 장치.
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