WO2015156227A1 - 波長変換部材、成形体、波長変換装置、シート部材、発光装置、導光装置、並びに表示装置 - Google Patents
波長変換部材、成形体、波長変換装置、シート部材、発光装置、導光装置、並びに表示装置 Download PDFInfo
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- WO2015156227A1 WO2015156227A1 PCT/JP2015/060613 JP2015060613W WO2015156227A1 WO 2015156227 A1 WO2015156227 A1 WO 2015156227A1 JP 2015060613 W JP2015060613 W JP 2015060613W WO 2015156227 A1 WO2015156227 A1 WO 2015156227A1
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- Prior art keywords
- light
- wavelength conversion
- layer
- light emitting
- resin layer
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Classifications
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- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
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- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
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- H01L2933/0091—Scattering means in or on the semiconductor body or semiconductor body package
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- 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
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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
- H01L33/507—Wavelength conversion elements the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
Definitions
- the present invention relates to a wavelength conversion member having a quantum dot, a molded body, a wavelength conversion device, a sheet member, a light emitting device, a light guide device, and a display device.
- a quantum dot is a nanoparticle having a particle diameter of about several nanometers to several tens of nanometers composed of several hundred to several thousand semiconductor atoms and forms a quantum well structure. Quantum dots are also called nanocrystals.
- Quantum dots can have various peak emission wavelengths depending on the crystal grain size and composition.
- a light-emitting device in which a resin layer containing quantum dots is arranged around an LED chip as in Patent Document 1 and Patent Document 2 is known.
- FIG. 15 is a schematic diagram of a conventional LED device (light emitting device).
- the LED device 1 shown in FIG. 15 includes a storage unit 2, an LED chip 3 disposed in the storage unit 2, and a resin layer 4 filled in the storage unit 2.
- the resin layer 4 contains a large number of quantum dots 5.
- the resin layer 4 shown in FIG. 15 is a fluorescent layer, and the light emitted from the LED chip 3 is converted in emission wavelength by the resin layer 4 and is emitted to the outside from the light emitting surface 1a.
- the light emission of the LED chip 3 causes blackening in the resin layer 4 containing the quantum dots 5 at the position A immediately above the LED chip 3, and the light emission efficiency of the LED device 1 is increased. It turns out that it falls.
- the present invention has been made in view of such points, and in particular, a wavelength conversion member, a molded body, a wavelength conversion device, a sheet member, which can suppress the occurrence of blackening of a resin layer located immediately above a light emitting element as compared with the conventional one.
- An object is to provide a light-emitting device, a light guide device, and a display device.
- the present invention is a wavelength conversion member having a quantum dot
- the wavelength conversion member is a first layer disposed on the side close to the light emitting element or on the light incident surface side, the side far from the light emitting element, or And a second layer disposed on the light emitting surface side
- the light scattering agent is contained in at least the first layer
- the quantum dots are contained in the first resin layer. It is not contained, but is contained in the second layer.
- the light scattering agent is preferably contained in the first layer in an amount of 0.2% by volume to 20% by volume.
- a fluorescent substance may be added instead of the light scattering agent or together with the light scattering agent.
- this invention is a wavelength conversion member which has a quantum dot,
- the said wavelength conversion member contains a light-scattering agent and a quantum dot in resin, and the said light-scattering agent is 2.5 with respect to the said resin. It is contained within the range of not less than 10% by mass and not more than 10% by mass.
- the present invention is characterized in that the wavelength conversion member described in any of the above is formed of a molded body.
- the wavelength conversion device includes a container provided with a storage space, and the wavelength conversion member described in any one of the above, or the molded body described above, disposed in the storage space. It is characterized by being configured.
- the sheet member in the present invention is characterized in that the wavelength conversion member described in any of the above is formed into a sheet shape.
- the light emitting device includes any of the wavelength conversion members described above and a light emitting element, and the wavelength conversion member constitutes a resin layer that covers a light emitting side of the light emitting element, The first layer constitutes a second resin layer on the side close to the light emitting element, and the second layer constitutes a second resin layer on the side far from the light emitting element.
- the light emitting element may be disposed in a storage portion, and the resin layer may be filled in the storage portion.
- the light guide device in the present invention is the wavelength conversion member described in any of the above, the wavelength conversion device described in the above, the sheet member described in the above, or the light emission described in any of the above. It is characterized by having an apparatus and a light-guide plate.
- the light guide device in the present invention is characterized in that the plurality of light emitting devices described above are arranged to face one surface constituting the light guide plate.
- the display device is a display unit, the wavelength conversion member described in any one of the above, disposed on the back side of the display unit, the wavelength conversion device described above, or the above. Or a light-emitting device according to any one of the above.
- a light scattering agent is added without adding quantum dots to the first layer on the side close to the light emitting element or on the light incident surface side, and on the side far from the light emitting element or on the light emitting surface.
- FIG. 11 is a longitudinal sectional view taken along the line DD and viewed from the arrow direction in a state in which the respective members of the light emitting element shown in FIG. 10 are combined. It is a graph which shows the relationship between the wavelength with respect to content of a light-diffusion agent, and light intensity. It is a graph which shows the relationship between content of a light-diffusion agent, and illumination intensity.
- FIG. 16 is a schematic diagram of an LED device (light emitting device) for investigating occurrence of blackening partially having a structure different from FIG. 15.
- FIG. 16 is a schematic diagram of an LED device (light-emitting device) for investigating occurrence of blackening partially having a structure different from FIG. 16, the same reference numerals as those in FIG. 15 denote the same members as those in FIG.
- the resin layer is composed of a first resin layer 12 that covers the surface of the LED chip 3 and a second resin layer 13 that covers the surface of the first resin layer 12. Yes.
- the quantum dots 5 are not included in the first resin layer 12 but are included only in the second resin layer 13.
- the present inventors have added a light scattering agent without adding quantum dots to the first layer (first resin layer) on the side close to the light emitting element or on the light incident surface side in order to suppress the occurrence of blackening.
- the present invention has reached an invention in which quantum dots are added to the second layer (second resin layer) on the side far from the light emitting element or on the light emitting surface side.
- the first layer and the second layer are different from the conventional structure in which strong light is irradiated locally on the wavelength conversion member (resin layer) made of a resin layer or the like.
- Light can enter the second layer from substantially the entire area of the interface.
- the occurrence of blackening of the wavelength conversion member can be effectively suppressed as compared with the conventional case, and the light emission efficiency can be improved.
- the LED device (light emitting device) 20 in the present embodiment is disposed on a storage case 21 having a bottom surface 21a and a side wall 21b surrounding the bottom surface 21a, and a bottom surface 21a of the storage case 21.
- An LED chip (light emitting element) 22 and a resin layer (wavelength conversion member) 23 that fills the storage case 21 and seals the upper surface side (light emitting side) of the LED chip 22 are configured.
- the upper surface side is a direction in which light emitted from the LED chip 22 is emitted from the storage case 21, and indicates a direction opposite to the bottom surface 21 a with respect to the LED chip 22.
- the LED chip 22 may be disposed on a base wiring board (not shown), and the base wiring board may constitute a bottom surface portion of the storage case 21.
- the base substrate for example, a configuration in which a wiring pattern is formed on a base material such as glass epoxy resin can be presented.
- the LED chip 22 is a semiconductor element that emits light when a voltage is applied in the forward direction, and has a basic configuration in which a P-type semiconductor layer and an N-type semiconductor layer are PN-junctioned.
- a light emitting element such as a semiconductor laser or an EL (electroluminescence) element can be used in place of the LED chip 22.
- the resin layer 23 includes a first resin layer (first layer) 24 covering the upper surface of the LED chip 22 and a second resin layer (covering the surface of the first resin layer 24). Second layer) 25.
- the first resin layer 24 is formed by dispersing a plurality of light scattering agents 27 in a resin 26.
- the second resin layer 25 includes a plurality of quantum dots 29 dispersed in a resin 28.
- the resins 26 and 28 constituting the first resin layer 24 and the second resin layer 25 are not particularly limited, but polypropylene, polyethylene, polystyrene, AS resin, ABS resin, methacrylic resin, polyvinyl chloride, polyacetal, Polyamide, Polycarbonate, Modified polyphenylene ether, Polybutylene terephthalate, Polyethylene terephthalate, Polysulfone, Polyethersulfone, Polyphenylene sulfide, Polyamideimide, Polymethylpentene, Liquid crystal polymer, Epoxy resin, Phenol resin, Urea resin, Melamine resin, Epoxy resin , Diallyl phthalate resin, unsaturated polyester resin, polyimide, polyurethane, silicone resin, or some mixture thereof can be used.
- the resin 26 used for the first resin layer 24 and the resin 28 used for the second resin layer 25 may be the same material or different.
- a resin having high thermal conductivity is disposed in the first resin layer 24, and the resin 28 that can improve the dispersibility of the quantum dots 29 is formed in the second resin layer 25.
- a silicone resin is used for the first resin layer 24 and an epoxy resin is used for the second resin layer 25.
- an epoxy resin, a silicone resin, or the like can be used for both the first resin layer 24 and the second resin layer 25.
- the material for the light scattering agent 27 is not particularly limited, fine particles such as silica (SiO 2 ), BN, and AlN can be presented.
- the effect of suppressing the occurrence of blackening can be improved. This is because blackening is considered to be affected by heat as well as light.
- the quantum dots 29 in the present invention have, for example, a core part 30 of semiconductor particles and a shell part 31 covering the periphery of the core part 30 as shown in FIG.
- CdSe is used for the core portion 30, but the material is not particularly limited.
- a core material containing at least Zn and Cd a core material containing Zn, Cd, Se and S, ZnCuInS, CdS, ZnSe, ZnS, CdSe, InP, CdTe, and some composites thereof Is possible.
- the shell part 31 protects the core part 30 as a fluorescent part.
- the shell portion 31 has a two-layer structure, that is, the shell portion 31 includes a first shell portion (shell I) 32 that covers the surface of the core portion 30 and a first shell portion 32. It is preferable that it is what is called a multishell structure which has the 2nd shell part (shell II) 33 which coat
- the band gap of the second shell portion 33 is made larger than the band gap of the first shell portion 32, but is not limited thereto.
- a large number of organic ligands 34 are coordinated on the surface of the quantum dots 29 (the surface of the second shell portion 33). Thereby, aggregation of the quantum dots 29 can be suppressed, and the dispersibility of the quantum dots 29 in the resin 28 can be improved.
- the material of the ligand is not particularly limited, and examples thereof include octadecene, octadecane, trioctylphosphine (TOP), trialkylphosphine oxide, alkylamine, dialkylamine, trialkylamine, and alkylphosphonic acid.
- the shell portion 31 has a two-layer structure, but may have a three-layer structure or a single-layer structure. In such a case, it is preferable that the shell portion 31 is composed of one layer of the second shell portion 33. In the present embodiment, it is possible to provide a one-layer structure that is controlled so that the composition ratio in the shell portion gradually changes as the distance from the core portion 30 increases.
- the shell part 31 is not formed, and the quantum dots 29 may be configured only by the core part 30 of the semiconductor particles. That is, as long as the quantum dot 29 includes at least the core portion 30, the quantum dot 29 may not include the covering structure with the shell portion. For example, when the shell portion is coated on the core portion, the region that becomes the covering structure may be small or the covering portion may be too thin to analyze and confirm the covering structure. Therefore, the quantum dot 29 can be determined regardless of the presence or absence of the shell portion by analysis.
- the light scattering agent 27 is added to the first resin layer 24, but the quantum dots 29 are not included.
- the light emitted from the LED chip 22 is guided to the second resin layer 25 while being scattered in the first resin layer 24, and the position A directly above the LED chip as described in the conventional example of FIG.
- the occurrence of black discoloration can be appropriately suppressed.
- at least the inner surface of the side wall 21b of the storage case (storage portion) 21 shown in FIG. 1A is formed as a light reflecting surface, so that the light scattered in the first resin layer 24 is appropriately second.
- the storage case 21 has a shape in which the side wall 21b is inclined so that the width dimension gradually increases as the distance from the bottom surface 21a increases. Therefore, the light reflected by the side wall 21b of the storage case 21 Can be appropriately guided to the second resin layer 25.
- the light diffused in the first resin layer 24 is the second Since it enters the resin layer 25, unlike the conventional case, it is possible to suppress strong light from entering locally at the boundary between the first resin layer 24 and the second resin layer 25 located immediately above the LED chip 22. Therefore, it is possible to appropriately suppress the occurrence of blackening immediately above the LED chip as shown in FIG. 16 and in the vicinity of the boundary B between the first resin layer and the second resin layer.
- the wavelength of the light guided to the second resin layer 25 is converted by the quantum dots 29, and light of a predetermined color is emitted outward from the light emitting surface 20a.
- the light scattering agent 27 contained in the first resin layer 24 is preferably about 0.2% by volume to 20% by volume.
- the light scattering agent 27 contained in the first resin layer 24 is preferably 1% by weight to 45% by weight. If the addition amount is less than 0.2% by volume or 1% by weight, the light scattering effect cannot be exhibited properly, and the occurrence of blackening cannot be suppressed appropriately. On the other hand, when the addition amount is higher than 20% by volume or 45% by weight, the light transmittance in the first resin layer 24 is lowered, and the light emission efficiency is likely to be lowered.
- the particle diameter of the light scattering agent 27 is preferably in the range of 0.2 ⁇ m to 100 ⁇ m.
- the LED device (light emitting device) 35 shown in FIG. 1B has a configuration in which a light scattering agent 27 is added to the second resin layer 25 in addition to the configuration of FIG. 1A. Thereby, the diffusion of light can be promoted even in the second resin layer 25, and an improvement in luminous efficiency is expected.
- the addition amount of the light scattering agent 27 contained in the second resin layer 25 can be made smaller than the addition amount of the light scattering agent 27 contained in the first resin layer 24.
- a light scattering agent 27 such as AlN or BN having high thermal conductivity
- the effect of suppressing blackening can be improved. This is because blackening is considered to be affected by heat as well as light.
- the light scattering agent 27 may be settled as well as being uniformly dispersed in the resin.
- the light scattering agent 27 that has settled in the first resin layer 24 may be aggregated in the vicinity of the surface of the LED chip 3.
- the resin layer 23 shown in FIGS. 1A and 1B has a two-layer structure of a first resin layer 24 and a second resin layer 25, but may be three or more layers. At this time, another resin layer can be interposed between the first resin layer 24 and the LED chip 22 or between the first resin layer 24 and the second resin layer 25. Alternatively, another resin layer may be formed on the second resin layer 25.
- the resin may contain a quantum dot and a fluorescent substance as a fluorescent pigment or a fluorescent dye other than the quantum dot.
- a fluorescent substance for example, red light emitting quantum dots and green light emitting fluorescent materials, or green light emitting quantum dots and red light emitting fluorescent materials.
- the fluorescent substance include YAG (yttrium, aluminum, garnet), TAG (terbium, aluminum, garnet), sialon, and BOS (barium orthosilicate), but the material is not particularly limited. Such a form can be appropriately applied to forms other than FIG.
- the fluorescent substance may be included in place of the light scattering agent or together with the light scattering agent.
- a green fluorescent material is added to the first resin layer 24 and a red quantum dot 29 is added to the second resin layer 25.
- the light is diffused by the green fluorescent material, and the diffused light is incident on the quantum dots 29. Accordingly, white light with uniform intensity can be emitted from the entire light emitting surface 20a.
- Various combinations of colors can be changed.
- the resin layer 23 has a single-layer structure, and the light scattering agent 27 and the quantum dots 29 are contained in the resin 28.
- the light scattering agent 27 is contained in an amount of 2.5% by mass to 10% by mass with respect to the resin 28.
- the quantum dots 29 are contained in an amount of several mass% with respect to the resin 28.
- FIG. 2 is a schematic diagram of another LED device (light emitting device).
- the LED chip (light-emitting element) 22 is installed on the base material 37, and the first resin layer (the first resin layer) extends from the upper surface of the LED chip 22 to the upper surface of the base material 37.
- Layer) 24 is formed.
- a second resin layer (second layer) 25 covers the upper surface of the first resin layer 24.
- the first resin layer 24 contains the light scattering agent 27 but does not contain the quantum dots 29.
- the second resin layer 25 includes quantum dots 29.
- the light scattering agent 27 may be included in the second resin layer 25.
- a case-shaped storage portion for storing the LED chip 22 and the resin layer 23 is not provided.
- a resin layer (wavelength conversion member) 23 is formed on the LED chip 22 installed on the LED chip 22 by potting or the like.
- the surface of the resin layer 23 is a dome shape, for example, a concave portion is formed on the surface, a rectangular shape, or the shape is not particularly limited.
- FIG. 4 is a schematic diagram of a light guide device using an LED device (light emitting device).
- 4A is a schematic plan view of the light guide device
- FIG. 4B is a schematic cross-sectional view of the plan view of FIG. 4A taken along the line AA and viewed from the direction of the arrows.
- the light guide device 40 shown in FIGS. 4A and 4B includes a light guide plate 41 and a plurality of LED devices (light emitting devices) 42 arranged to face the side end surface 41a of the light guide plate 41.
- the LED device 42 shown in FIGS. 4A and 4B is the LED device 20 shown in FIG. 1A, the LED device 35 shown in FIG. 1B, the LED device 38 shown in FIG. 2, or a part of the LED device 20, 35 or 38. (However, the configuration in which the light scattering agent 27 is added to the first resin layer 24, but the quantum dots are not added, and the quantum dots 29 are added to the second resin layer 25 is not changed).
- the plurality of LED devices 42 are supported by, for example, a case-like support body 43.
- the LED devices 42 are arranged in a line on the inner surface of the support 43 with a predetermined interval. Since the support body 43 is incorporated in the side end surface 41 a of the light guide plate 41, each LED device 42 is disposed in a state of facing the side end surface 41 a of the light guide plate 41.
- a reflective plate 44 is provided on the back surface 41b of the light guide plate 41, and a display unit 45 such as a liquid crystal display is disposed on the front surface 41c side of the light guide plate 41.
- a polarizing plate 46 and the like are disposed between the light guide plate 41 and the display unit 45.
- the display unit 45 and the polarizing plate 46 indicated by dotted lines are not used as the constituent members of the light guide device 40, but the polarizing plate 46 and the like can be incorporated as the constituent members of the light guide device 40.
- a configuration in which the display unit 45 is incorporated in the light guide device 40 is defined as a display device.
- the LED device 42 that suppresses the occurrence of blackening is used, and the light extraction efficiency from the surface (light emission surface) 41 c of the light guide plate 41 is effectively improved. be able to.
- a light scattering agent is added to the first resin layer constituting the LED device 42 so that diffused light can be appropriately emitted from the entire light emitting surface of the LED device 42. The light can be guided over substantially the whole. As a result, a reduction in production cost can be expected by partially deleting (for example, deleting the diffusion plate) or changing the layer structure that has been interposed between the light guide plate 41 and the display unit 45 in the past.
- FIG. 5 is a schematic diagram of a display device using an LED device (light emitting device).
- 5A is a schematic plan view of the display device
- FIG. 5B is a schematic cross-sectional view of the plan view of FIG. 5A cut along the line BB and viewed from the direction of the arrow.
- the display device 50 includes a plurality of LED devices 51 and a display unit 54 such as a liquid crystal display facing the LED devices 51.
- a display unit 54 such as a liquid crystal display facing the LED devices 51.
- Each LED device 51 is disposed on the back side of the display unit 54.
- the LED device 51 shown in FIGS. 5A and 5B includes the LED device 20 shown in FIG. 1A, the LED device 35 shown in FIG. 1B, the LED device 38 shown in FIG. 2, or one of the LED devices 20, 35, or 38.
- the configuration is changed (however, the light scattering agent 27 is added to the first resin layer 24, but the quantum dots are not added, and the configuration in which the quantum dots 29 are added to the second resin layer 25 is not changed).
- the plurality of LED devices 51 are supported by a support body 52.
- Each LED device 51 is arranged at a predetermined interval.
- Each LED device 51 and the support body 52 constitute a backlight 55 for the display unit 54.
- the support 52 is not particularly limited in shape or material such as a sheet shape, a plate shape, or a case shape.
- a polarizing plate 53 or the like is interposed between the backlight 55 and the display unit 54.
- the LED device 51 that suppresses the occurrence of blackening is used, and the light extraction efficiency of the backlight 55 can be improved.
- a light-scattering agent is added to the 1st resin layer which comprises the LED apparatus 51, and diffused light can be discharge
- FIG. 6 is a schematic diagram of a resin molded body provided with quantum dots.
- a bar-shaped wavelength conversion member 62 is interposed between a light emitting element 60 such as an LED and a light guide plate 61.
- the wavelength conversion member 62 shown in FIG. 6 is formed by molding a resin containing quantum dots into a bar shape, a rod shape, or a rod shape.
- the light emitted from the light emitting element 60 is wavelength-converted by the wavelength conversion member 62, and the wavelength-converted light is emitted to the light guide plate 61.
- the wavelength conversion member 62 includes quantum dots having fluorescence wavelengths of 520 nm (green) and 660 nm (red). A part of the blue photons emitted from the light emitting element 60 is converted into green or red by the respective quantum dots, so that white light is emitted from the wavelength conversion member 62 toward the light guide plate 61.
- the wavelength conversion member 62 has a two-layer structure.
- the first layer 62 a is formed on the side close to the light emitting element 60 (light incident surface side), and the second layer 62 b is formed on the side far from the light emitting element 60 (light emitting surface side).
- the first layer 62a and the second layer 62b can be formed in two colors.
- the light scattering agent is contained in at least the first layer 62a, and the quantum dots are not contained in the first layer 62a but are contained in the second layer 62b.
- a wavelength conversion sheet 63 formed using a resin containing quantum dots is provided on the light emitting surface of the light guide plate 61.
- the wavelength conversion sheet 63 may be formed by coating on the light guide plate 61, or formed in advance in a sheet shape, and the wavelength conversion sheet 63 is superimposed on the light emitting surface of the light guide plate 61. Also good. Further, another film such as a diffusion film may be interposed between the light guide plate 61 and the wavelength conversion sheet 63.
- the wavelength conversion sheet 61 has a two-layer structure, the first layer formed on the light incident surface side contains a light scattering agent, and the second layer formed on the light output surface side has quantum dots. include.
- Both the light guide plate 61 and the wavelength conversion sheet 63 may include quantum dots that emit green light and quantum dots that emit red light.
- the light guide plate 61 may include quantum dots that emit green light
- the wavelength conversion sheet 63 may include quantum dots that emit red light.
- the light guide plate 61 may include quantum dots that emit red light
- the wavelength conversion sheet 63 may include quantum dots that emit green light.
- FIG. 8 is a longitudinal sectional view of a sheet member provided with quantum dots, and a schematic diagram of an application using the sheet member.
- the sheet member 65 includes a quantum dot layer 66 having quantum dots, and barrier layers 67 and 68 formed on both sides of the quantum dot layer 66.
- a “sheet” has a thickness that is small relative to its length and width.
- the sheet member 65 may or may not be flexible, but is preferably flexible.
- the sheet member 65 may be simply referred to as a sheet, or may be referred to as a film or a film sheet.
- the barrier layers 67 and 68 are disposed on both sides of the quantum dot layer 66, respectively.
- an adhesive layer may be provided between the quantum dot layer 66 and the barrier layers 67 and 68, in this embodiment, the barrier layers 67 and 68 can be formed in contact with both surfaces of the quantum dot layer 66. .
- both surfaces of the quantum dot layer 66 are protected, and environmental resistance (durability) can be improved.
- Each of the barrier layers 67 and 68 is formed of a single organic layer or a laminated structure of an organic layer and an inorganic layer.
- An example of the organic layer is a PET (polyethylene terephthalate) film.
- Examples of the inorganic layer can be exemplified by SiO 2 layer.
- the inorganic layer may be a layer of silicon nitride (SiN x ), aluminum oxide (Al 2 O 3 ), titanium oxide (TiO 2 ) or silicon oxide (SiO 2 ), or a laminate thereof.
- the quantum dot layer 66 is divided into two layers.
- the surface of the barrier layer 67 on the first layer 66a side constitutes a light incident surface
- the barrier layer 68 on the second layer 66b side constitutes a light emitting surface. Therefore, the first layer 66a is disposed closer to the light emitting element than the second layer 66b.
- the light scattering agent is contained in at least the first layer 66a, and the quantum dots are not contained in the first layer 66a but are contained in the second layer 66b.
- the sheet member 65 including quantum dots can be incorporated into, for example, the backlight device 93 shown in FIG. 8B.
- a backlight device 93 is configured including a plurality of light emitting elements 92 (LEDs) and a sheet member 65 facing the light emitting elements 92.
- each light emitting element 92 is supported on the surface of a support 91.
- the backlight device 93 is arranged on the back side of the display unit 94 such as a liquid crystal display to constitute the display device 90.
- the light emitting element 92 shown in FIG. 8B may be the LED device shown in FIG. 1 or FIG.
- a diffuser plate for diffusing light, other sheets, and the like may be interposed between the light emitting element 92 and the display unit 94 in addition to the sheet member 65.
- the sheet member 65 is formed of a single sheet, for example, a plurality of sheet members 65 may be connected so as to have a predetermined size.
- a configuration in which a plurality of sheet members 65 are connected by tiling is referred to as a composite sheet member.
- the light emitting element 92 / the composite sheet member 95 / the diffusion plate 96 / the display unit 94 are arranged in this order. According to this, even when unevenness of emission color due to irregular reflection or deterioration of quantum dots due to water vapor entering from the joint occurs at the joint of each sheet member constituting the composite sheet member 95, the display is performed. It is possible to appropriately suppress the occurrence of color unevenness in the display of the portion 94. That is, since the light emitted from the composite sheet member 95 is diffused by the diffusion plate 96 and then enters the display unit 94, color unevenness in the display of the display unit 94 can be suppressed.
- FIG. 9 is a perspective view and a cross-sectional view taken along line CC of the wavelength conversion device including quantum dots.
- FIG. 9A is a perspective view of the wavelength conversion device
- FIG. 9B is a cross-sectional view of the wavelength conversion device shown in FIG. 9A cut along a line CC and viewed from the arrow direction.
- the wavelength conversion device 70 includes a container 71 and a molded body 72 containing a wavelength conversion substance.
- the container 71 includes a storage space 73 that can store and hold a molded body 72 containing a wavelength converting substance.
- the container 71 is preferably a transparent member. “Transparent” refers to what is generally recognized as transparent or has a visible light transmittance of about 50% or more.
- the vertical and horizontal dimensions of the container 71 are about several mm to several tens of mm, and the vertical and horizontal dimensions of the storage space 53 are about several hundred ⁇ m to several mm.
- the container 71 includes a light incident surface 71a, a light emitting surface 71b, and a side surface 71c connecting the light incident surface 71a and the light emitting surface 71b. As shown in FIG. 9, the light incident surface 71a and the light emitting surface 71b are in a positional relationship facing each other.
- the container 71 has a storage space 73 formed inside the light incident surface 71a, the light emitting surface 71b, and the side surface 71c. A part of the storage space 73 may reach the light incident surface 71a, the light emitting surface 71b, or the side surface 71c.
- a glass tube container for example, a glass tube container, and can be exemplified by a glass capillary.
- a resin or the like may be used as long as the container having excellent transparency can be configured as described above.
- a molded body 72 containing a wavelength converting substance is disposed in the storage space 73.
- the storage space 73 is open, and a molded body 72 containing a wavelength converting substance can be inserted therefrom.
- the molded body 72 containing the wavelength converting substance can be inserted into the storage space 73 by means such as press fitting or adhesion.
- the molded body 72 containing the wavelength conversion substance is formed to be completely the same size as the storage space 73 or slightly larger than the storage space 73, and the molded body 72 containing the wavelength conversion substance while applying pressure. Is inserted into the storage space 73 to suppress the generation of a gap between the molded body 72 containing the wavelength converting substance and the container 71 as well as the inside of the molded body 72 containing the wavelength converting substance. it can.
- the molded body 72 containing the wavelength conversion substance is bonded and fixed in the storage space 73, the molded body 72 containing the wavelength conversion substance is molded to be smaller than the storage space 73, and the side surface of the molded body 72 containing the wavelength conversion substance.
- a molded body 72 containing a wavelength converting substance is inserted into the storage space 73 with the adhesive layer applied thereto.
- the cross-sectional area of the molded body 72 may be slightly smaller than the cross-sectional area of the accommodation space 73.
- the compact 72 containing the wavelength converting substance and the container 71 are in close contact with each other through the adhesive layer, and the formation of a gap between the compact 72 containing the wavelength converting substance and the container 71 is suppressed. it can.
- the adhesive layer the same resin as the molded body 72 or a resin having a common basic structure can be used. Alternatively, a transparent adhesive may be used as the adhesive layer.
- the molded body 72 is formed in a two-layer structure, and includes a first layer 72a on the light incident surface 71a side and a second layer 72b on the light emitting surface 71b side.
- the first layer 72a and the second layer 72b can be formed in two colors.
- the light scattering agent is contained in at least the first layer 72a, and the quantum dots are not contained in the first layer 72a, but are contained in the second layer 72b.
- the light scattering agent may be contained in the container front end 71d between the light incident surface 71a and the molded body 72.
- the molded body 72 may have a configuration in which quantum dots are dispersed throughout. That is, the container front end 71d constitutes the first layer, and the molded body 72 constitutes the second layer.
- the refractive index of the molded body 72 containing the wavelength converting substance is preferably smaller than the refractive index of the container 71.
- a part of the light that has entered the molded body 72 containing the wavelength converting substance is totally reflected by the side wall portion of the container 71 facing the storage space 73.
- the incident angle on the medium side with a small refractive index is larger than the incident angle on the medium side with a large refractive index.
- a light emitting element is disposed on the light incident surface 71a side of the wavelength conversion member 70 shown in FIG.
- a light guide plate 61 shown in FIG. 6 is disposed on the light exit surface 71b side of the wavelength conversion member 70.
- FIG. 10 is a perspective view of a light-emitting element configured to have a wavelength conversion member including quantum dots.
- FIG. 11 is a longitudinal sectional view taken along the line DD and viewed from the arrow direction in a state where the respective members of the light emitting element shown in FIG. 10 are combined.
- the 10 and 11 includes a wavelength converting member 76 and an LED chip (light emitting unit) 85.
- the wavelength conversion member 76 includes a container 79 constituted by a plurality of pieces of a container main body 77 and a lid 78. As shown in FIG. 10, a bottomed storage space 80 is formed at the center of the container body 77.
- the storage space 80 is provided with a wavelength conversion layer 84 containing quantum dots.
- the wavelength conversion layer 84 may be a molded body or may be filled in the storage space 80 by potting or the like. And the container main body 77 and the cover body 78 are joined through an adhesive layer.
- the lower surface of the container 79 of the wavelength converting member 76 is a light incident surface 79a.
- the upper surface facing the light incident surface 79a is the light emitting surface 79b.
- a storage space 80 is formed at an inner position with respect to each side surface 79c provided on the container 79 of the wavelength conversion member 76 shown in FIGS.
- the LED chip 85 is connected to a printed wiring board 81, and the periphery of the LED chip 85 is surrounded by a frame 82 as shown in FIGS.
- the inside of the frame body 82 is sealed with a resin layer 83.
- the wavelength conversion member 76 is joined to the upper surface of the frame body 82 via an adhesive layer (not shown) to form a light emitting element 75 such as an LED.
- the wavelength conversion layer 84 is formed in a two-layer structure, and includes a first layer 84a on the light incident surface 79a side and a second layer 84b on the light exit surface 79b side.
- the first layer 84a and the second layer 84b can be formed in two colors.
- the light scattering agent is contained in at least the first layer 84a, and the quantum dots are not contained in the first layer 84a but are contained in the second layer 84b.
- the light scattering agent may be contained in the container front end 79d between the resin layer 83 or the light incident surface 79a and the wavelength conversion layer 84.
- the wavelength conversion layer 84 may have a configuration in which quantum dots are dispersed throughout. That is, the container front end 79d and / or the resin layer 83 constitutes the first layer, and the wavelength conversion layer 84 constitutes the second layer.
- the LED device (light emitting device) of the present invention can be applied to an illumination device, a light source device, a light diffusing device, a light reflecting device, etc. in addition to the light guide device and the display device described above.
- the quantum dots were mixed in the resin in the range of about 1% by mass to 2% by mass and the light scattering agent in the range of 25.5% by mass to 10% by mass.
- “Abs10” shown in FIGS. 12 and 13 refers to a mixture of quantum dots of about 1% to 2% by mass
- “Abs15” refers to a mixture of about 2.5% by mass of quantum dots. Point to.
- FIG. 1C corresponds to the configuration of the resin layer.
- a 450 nm wavelength LED driving 40 mA was lighted as a light source.
- the relationship between the wavelength and the light intensity with respect to the content of the light diffusing agent FIG. 12
- the relationship between the content of the light diffusing agent and the illuminance FIG. 13
- the relationship between the x coordinate and the y coordinate (FIG. 14) was measured.
- the illuminance was increased by adding the light scattering agent rather than adding it. Further, as shown in FIG. 13, in the two examples in which 5% of the light scattering agent was added, the amount of quantum dots was about 1-2% by mass on the one hand and the other (Abs15) was about 2.5% by weight. Although the amount of quantum dots was different, the illuminance was almost the same.
- the light scattering agent is included in the range of 2.5% by mass or more and 10% by mass or less with respect to the resin, so that it is possible to obtain good white light emission and high illuminance. all right.
- an LED device or the like in which blackening does not occur in the fluorescent layer located immediately above the LED chip.
- the light emitting element not only an LED but also an organic EL can be employed.
- the wavelength of the color in the resin layer containing the quantum dots can be variously converted, and there is a variety of fluorescent colors, blackening does not occur, and the product life is shortened.
- a long light emitting device or the like can be manufactured.
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Abstract
Description
コア/シェル構造の赤色発光量子ドット(QY値;83%)と緑色発光量子ドット(QY値;80%、81%)
[量子ドットに対する分散樹脂]
シリコーン樹脂、又は、エポキシ樹脂
[光散乱剤]
シリカ(SiO2)
Claims (12)
- 量子ドットを有する波長変換部材であって、
前記波長変換部材は、発光素子に近い側、あるいは光入射面側に配置される第1の層と、前記発光素子から遠い側、あるいは光出射面側に配置される第2の層とを有して構成され、
光散乱剤が、少なくとも前記第1の層に含有されており、前記量子ドットは、前記第1の樹脂層に含まれておらず前記第2の層に含有されていることを特徴とする波長変換部材。 - 前記光散乱剤は、前記第1の層に、0.2体積%~20体積%含まれることを特徴とする請求項1記載の波長変換部材。
- 前記光散乱剤に代えて、あるいは前記光散乱剤とともに蛍光物質が添加されることを特徴とする請求項1又は2に記載の波長変換部材。
- 量子ドットを有する波長変換部材であって、
前記波長変換部材は、樹脂中に光散乱剤及び量子ドットが含有されてなり、前記光散乱剤は前記樹脂に対して2.5質量%以上10質量%以下の範囲内で含まれることを特徴とする波長変換部材。 - 請求項1ないし4のいずれかに記載された波長変換部材が成形体で形成されてなることを特徴とする成形体。
- 収納空間が設けられた容器と、
前記収納空間内に配置された請求項1ないし4のいずれかに記載された波長変換部材、あるいは請求項5に記載の成形体と、を有して構成されることを特徴とする波長変換装置。 - 請求項1ないし4のいずれかに記載された波長変換部材がシート状に形成されてなることを特徴とするシート部材。
- 請求項1ないし3のいずれかに記載された波長変換部材と、発光素子と、を有し、前記波長変換部材は、前記発光素子の発光側を覆う樹脂層を構成し、前記第1の層が、前記発光素子に近い側の第2の樹脂層を構成し、前記第2の層が、前記発光素子から遠い側の第2の樹脂層を構成することを特徴とする発光装置。
- 前記発光素子は、収納部内に配置され、前記樹脂層は、前記収納部内に充填されていることを特徴とする請求項8記載の発光装置。
- 請求項1ないし4のいずれかに記載された波長変換部材、又は、請求項5に記載された成形体、又は、請求項6に記載の波長変換装置、又は、請求項7に記載のシート部材、又は、請求項8及び請求項9のいずれかに記載の発光装置と、導光板とを有して構成されることを特徴とする導光装置。
- 請求項8及び請求項9のいずれかに記載の複数の発光装置が、導光板を構成する一面に対向して配置されることを特徴とする導光装置。
- 表示部と、前記表示部の裏面側に配置された、請求項1ないし4のいずれかに記載された波長変換部材、又は、請求項5に記載された成形体、又は、請求項6に記載の波長変換装置、又は、請求項7に記載のシート部材、又は、請求項8及び請求項9のいずれかに記載の発光装置と、を有することを特徴とする表示装置。
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US20190383467A1 (en) | 2019-12-19 |
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JP2020043353A (ja) | 2020-03-19 |
US10101008B2 (en) | 2018-10-16 |
TWI699910B (zh) | 2020-07-21 |
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