WO2013024684A1 - Dispositif luminescent, feuille fluorescente ainsi que procédé de fabrication de celle-ci, et système de rétroéclairage - Google Patents

Dispositif luminescent, feuille fluorescente ainsi que procédé de fabrication de celle-ci, et système de rétroéclairage Download PDF

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Publication number
WO2013024684A1
WO2013024684A1 PCT/JP2012/069161 JP2012069161W WO2013024684A1 WO 2013024684 A1 WO2013024684 A1 WO 2013024684A1 JP 2012069161 W JP2012069161 W JP 2012069161W WO 2013024684 A1 WO2013024684 A1 WO 2013024684A1
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Prior art keywords
phosphor
light
phosphor sheet
layer
emitting device
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PCT/JP2012/069161
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English (en)
Japanese (ja)
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一規 安念
真 和泉
貴三子 三枝
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シャープ株式会社
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • 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
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • 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
    • 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
    • H01L33/58—Optical field-shaping elements
    • H01L33/60—Reflective elements

Definitions

  • the present invention relates to a light-emitting device used for illumination and a display, and in particular, includes a light source and a phosphor sheet containing a phosphor excited by a part of light output from the light source, and the light from the light source and fluorescence
  • the present invention relates to a light emitting device that emits light from a body.
  • the present invention also relates to a phosphor sheet used in the light emitting device, a backlight system using the light emitting device, and a method for manufacturing the phosphor sheet.
  • LEDs light emitting devices using light emitting diodes
  • LEDs have excellent characteristics such as low power consumption, long product life, and small influence on the environment.
  • the light emitting part of the LED backlight or the LED bulb emits a combination of light obtained by wavelength-converting part of the LED light and light not wavelength-converted by the LED phosphor.
  • Various light different from light can be emitted.
  • Such a light-emitting device is highly expected as a light-emitting device that replaces the conventional lighting and backlights of displays, and various developments have been made.
  • a first method is to cover the blue LED chip by mixing the phosphor with a resin material
  • a second method is a light emitting surface of the blue LED chip.
  • various methods such as a method of directly applying the phosphor and a third method such as a method of placing a phosphor-containing sheet on a blue chip.
  • the most commonly used method is the first method.
  • heat due to the light emission of the blue LED directly affects the phosphor, so that depending on the type of the phosphor, the heat may cause deterioration.
  • the nanocrystalline phosphor has high emission intensity and excellent color rendering and color reproducibility, but has a low heat-resistant temperature and is easily affected by heat.
  • the surface where the phosphor is in contact with the outside is easily affected by oxygen and moisture, causing deterioration of the phosphor.
  • the resin may be deteriorated or discolored.
  • a phosphor sheet in which a phosphor or a resin containing the phosphor is sandwiched between the glass and organic glass, which is the third method, has attracted attention.
  • the phosphor sheet is easy to handle and is not easily affected by oxygen or moisture, and can be provided separately from the light emitting element, so that it is not directly affected by heat.
  • FIG. 13 is a schematic view of a light emitting device disclosed in Japanese Patent Laid-Open No. 2005-244075 (Patent Document 1).
  • the light emitting device 100 disclosed in the patent document includes a light emitting element 101 that emits primary light, and a silicone that includes a phosphor that absorbs part of the primary light and emits secondary light having a wavelength equal to or greater than the wavelength of the primary light.
  • a phosphor sheet 102 made of resin, and the phosphor sheet 102 includes two kinds of phosphors 103 and 104 having different excitation wavelength ranges.
  • FIG. 14 is a schematic diagram of a light emitting device disclosed in Japanese Patent Application Laid-Open No. 2007-317787 (Patent Document 2).
  • the light-emitting device 200 disclosed in the patent document is formed of a material in which a phosphor 204 is sandwiched between light-transmitting plates 203 and sealed with a sealant 205 on the upper surface of a substrate 202 on which a light-emitting element 201 is placed.
  • the phosphor sheet 208 is mounted via the reflection frame 206.
  • the present invention has been made in view of the above problems, and its purpose is a light-emitting device using a phosphor sheet, which reduces the loss of the amount of light emitted from the phosphor, ideal color rendering,
  • the object is to provide a light emitting device having excellent color reproducibility, a phosphor sheet used in the light emitting device, a backlight system, and a method for producing the phosphor sheet.
  • the present invention is a light emitting device including a light emitting element that emits primary light and a phosphor sheet that absorbs a part of the primary light and emits secondary light, the phosphor sheets facing each other. A light incident surface and a light emission surface, and a light reflective side surface for reflecting light from the inside of the phosphor sheet.
  • the phosphor sheet includes a light reflecting film provided on a side surface.
  • the light reflectivity is imparted by the light reflecting film.
  • the side surface of the phosphor sheet has a tapered shape that expands from the light incident surface toward the light emitting surface.
  • the light reflectivity is imparted by the tapered side surface.
  • the phosphor sheet preferably includes a phosphor layer containing a phosphor and two transparent layers provided so as to sandwich the phosphor layer.
  • the phosphor sheet includes a first phosphor layer including a first phosphor and a second phosphor that emits secondary light having a shorter wavelength than the first phosphor.
  • a second phosphor layer, and in the phosphor sheet, a first phosphor layer and a second phosphor layer are laminated in this order from the light incident surface to the light emitting surface.
  • At least one of the first phosphor and the second phosphor is preferably a phosphor made of nanocrystals.
  • the present invention is a phosphor sheet that is used in a light-emitting device including a light-emitting element that emits primary light, and absorbs a part of the primary light to emit secondary light.
  • a light-emitting element that emits primary light, and absorbs a part of the primary light to emit secondary light.
  • a light-emitting surface, and a light-reflecting side surface that reflects light from the inside of the phosphor sheet.
  • the phosphor sheet according to an embodiment of the present invention includes a light reflecting film provided on the side surface.
  • the light reflectivity is imparted by the light reflecting film.
  • the side surface has a tapered shape that expands from the light incident surface toward the light emission surface.
  • the light reflectivity is imparted by the tapered side surface.
  • the phosphor sheet of the present invention preferably includes a phosphor layer containing a phosphor and two transparent layers provided so as to sandwich the phosphor layer.
  • a first phosphor layer including a first phosphor and a second phosphor layer including a second phosphor that emits secondary light having a shorter wavelength than the first phosphor is laminated in this order from the light incident surface to the light emitting surface. At least one of the first phosphor and the second phosphor is preferably a phosphor made of nanocrystals.
  • the present invention is also a backlight system for video equipment including the above-described light emitting device.
  • the manufacturing method of the fluorescent substance sheet of this invention is a method of manufacturing the above-mentioned fluorescent substance sheet in which the 1st transparent layer, the fluorescent substance layer containing fluorescent substance, and the 2nd transparent layer were laminated
  • a step of pouring or applying the first transparent layer material into a die having a tapered shape whose side surfaces expand upward, and forming a first transparent layer; and a phosphor on the first transparent layer A step of casting or applying a phosphor layer material to form a phosphor layer, and a step of pouring or applying a second transparent layer material onto the phosphor layer to form a second transparent layer.
  • a light emitting device using a phosphor sheet it is possible to obtain a light emitting device excellent in ideal color rendering and color reproducibility by reducing the loss of the amount of light emitted from the phosphor.
  • FIG. 1 is a cross-sectional view of a light emitting device according to Embodiment 1.
  • FIG. It is the perspective view and sectional drawing of a fluorescent substance sheet. It is sectional drawing which shows the manufacturing method of a fluorescent substance sheet. It is sectional drawing which shows the example of installation of a fluorescent substance sheet. It is a figure explaining the motion of the light of a fluorescent substance sheet.
  • 6 is a cross-sectional view of a light emitting device according to Embodiment 2.
  • FIG. It is a figure which shows the manufacturing method of a fluorescent substance sheet. It is sectional drawing which shows the example of installation of a fluorescent substance sheet. It is sectional drawing of the light-emitting device which concerns on Embodiment 3.
  • FIG. 6 is a cross-sectional view of a light emitting device according to Embodiment 5.
  • FIG. It is sectional drawing of the backlight system which concerns on Embodiment 6.
  • FIG. It is the schematic of the light-emitting device of a prior art example. It is the schematic of the light-emitting device of a prior art example.
  • FIG. 1 is a cross-sectional view of a light emitting device 10 according to the present embodiment.
  • the light emitting device 10 faces the substrate 2 on which the electrode 1 is formed, the package 3 and the light emitting element 4 provided on the electrode 1, the wire 5 that connects the light emitting element 4 and the electrode 1, and the light emitting element 4.
  • the phosphor sheet 6 is arranged.
  • the phosphor sheet 6 according to the present embodiment has a configuration in which the first transparent layer 61, the phosphor layer 62, and the second transparent layer 63 are sequentially laminated, and the light reflecting film 64 is formed on the side surface 6c. ing.
  • the light reflecting film 64 is provided on the side surface 6c, the light traveling from the inner side of the phosphor sheet 6 toward the side surface 6c is reflected at a high reflectance on the side surface 6c or in the vicinity of the side surface 6c.
  • the surface of the first transparent layer 61 opposite to the phosphor layer 62 is the light incident surface 6a
  • the surface of the second transparent layer 63 opposite to the phosphor layer 62 is the light emitting surface 6b.
  • the surface 6a and the light emitting surface 6b face each other.
  • the light emission surface 6 b of the phosphor sheet 6 is also the light emission surface of the light emitting device 10.
  • the conductor forming the electrode 1 has a function as a conductive path for electrically connecting the light emitting element 4, and is electrically connected to the light emitting element 4 by the wire 5.
  • a metallized layer containing metal powder such as W, Mo, Cu, or Ag can be used.
  • the substrate 2 is required to have high thermal conductivity and a high total reflectance, for example, a polymer resin in which metal oxide fine particles are dispersed in addition to a ceramic material such as alumina or aluminum nitride is suitable. Used.
  • the light-emitting element 4 is used as a light source and preferably has a peak wavelength in the range of 360 nm to 470 nm.
  • a GaN-based light-emitting diode, ZnO-based light-emitting diode, or organic EL having a peak wavelength at 450 nm can be used.
  • FIG. 2A is a perspective view of the phosphor sheet 6, and FIG. 2B is a cross-sectional view of the phosphor sheet 6.
  • the phosphor sheet 6 includes a first transparent layer 61, a phosphor layer 62, a second transparent layer 63, and a light reflecting film 64.
  • the first transparent layer 61 and the second transparent layer 63 are preferably transparent in the visible range and high in strength.
  • organic glass such as glass mainly composed of silicate and polycarbonate can be used. Since glass containing silicic acid as a main component has a high barrier property against gas moisture, it is possible to suppress deterioration of the phosphor and resin due to oxygen and moisture adhering to the phosphor layer 62. Moreover, organic glass has a softness
  • the 1st transparent layer 61 and the 2nd transparent layer 63 may be formed with the same raw material, and may be formed with a different raw material.
  • quartz glass has a transmittance of about 95% in a wavelength region of 250 nm or more, and thus easily transmits LED light and fluorescence.
  • PMMA polymethyl methacrylate
  • PMMA has high weather resistance among organic glasses, so that deterioration such as coloring hardly occurs and it can be used for a long time.
  • the thickness of the first transparent layer 61 and the second transparent layer 63 can be appropriately determined according to the material and the like.
  • the phosphor layer 62 is composed of a resin layer containing a phosphor. Any phosphor may be used as long as it is a general phosphor. For example, a phosphor made of nanocrystals, a rare earth activated phosphor or a transition metal element activated phosphor can be used. In the present specification, “nanocrystal” refers to a crystal having a crystal diameter less than the exciton Bohr radius and in which exciton confinement or band gap increase due to the quantum size effect is observed.
  • a phosphor made of nanocrystals it is particularly preferable to use a phosphor made of nanocrystals.
  • the diameter of the nanocrystal is smaller than the wavelength of visible light, and the primary light emitted from the light emitting element is not scattered (Mie scattering), so the directivity of the primary light is not lowered.
  • the phosphor made of nanocrystals for example, InP-based nanocrystals can be used.
  • the particle size of InP is reduced (nanocrystallization)
  • the band gap can be controlled in the range from blue to red by the quantum effect.
  • a phosphor layer is formed by mixing and curing InP-based nanocrystals having a particle size that emits green light and a particle size that emits red light in a silicone resin or an acrylic resin.
  • a phosphor that is a nanocrystal made of a III-V compound semiconductor or II-VI compound semiconductor other than InP may be used as the phosphor material.
  • a nanocrystalline compound semiconductor composed of a II-VI group compound semiconductor or a III-V group compound semiconductor in a binary system, as a II-VI group compound semiconductor, CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, PbSe, PbS etc. are mentioned.
  • the III-V group compound semiconductor include GaN, GaP, GaAs, AlN, AlP, AlAs, InN, InP, InAs, and the like.
  • the nanocrystal containing In and P or the nanocrystal containing Cd and Se it is preferable to use the nanocrystal containing In and P or the nanocrystal containing Cd and Se.
  • a nanocrystal containing In and P or a nanocrystal containing Cd and Se can easily produce a nanocrystal having a particle size that emits light in the visible light region (380 nm to 780 nm).
  • InP and CdSe are easy to manufacture because of the small amount of constituent materials, and also show high quantum yield, and show high luminous efficiency when irradiated with LED light.
  • the quantum yield is the ratio of the number of photons emitted as fluorescence to the number of absorbed photons.
  • InP which does not contain Cd which shows strong toxicity as the phosphor.
  • the resin used for the phosphor layer 62 is preferably a resin in which the phosphor is uniformly dispersed, is transparent, and is resistant to heat and light.
  • the resin used in the phosphor layer 62 and the first transparent layer 61 and the second transparent layer 61 are used. It is preferable that there is no difference in the refractive index of the resin used in the transparent layer 63 or it is as small as possible.
  • the phosphor layer 62 can also be made of a difference in refractive index by using an acrylic resin.
  • acrylic resin polylauryl methacrylate (PLMA), PMMA or the like can be used.
  • the proportion of the phosphor contained in the phosphor layer 62 is not particularly limited, but can be, for example, 0.72% to 36% (weight%).
  • the thickness of the phosphor layer 62 is not particularly limited, but can be, for example, 10 ⁇ m to 500 ⁇ m.
  • the light reflecting film 64 is preferably made of a material having a high reflectivity, and for example, silver or aluminum can be used. Silver has a light reflectance of about 98% in the wavelength region of 450 nm to 700 nm, and aluminum has a light reflectance of about 90% in the wavelength region of 280 nm to 1000 nm. Light and secondary light can be reflected without waste.
  • the thickness of the light reflection film 64 is not particularly limited, it is preferable that the light reflection film 64 has a sufficient thickness so that light from the inside of the phosphor sheet 6 is reflected with high reflectance in the side surface 6c or in the vicinity of the side surface 6c.
  • the light reflecting film 64 is preferably configured to cover the entire side surface 6c. However, the portion of the side surface 6c where light from the phosphor 65 is likely to enter, for example, the phosphor layer 62 and the second transparent layer. The structure provided only in the part corresponding to the layer 63 may be sufficient.
  • FIG. 3 is a cross-sectional view illustrating a manufacturing process of the phosphor sheet 6 used in the light emitting device 10.
  • a silicone resin containing a predetermined amount of a nanocrystalline phosphor emitting red light and a nanocrystalline phosphor emitting green light is applied to the first transparent layer 61 to a thickness of 300 ⁇ m.
  • the body layer 62 is formed.
  • quartz glass having a thickness of 1 mm is used for the first transparent layer 61.
  • a silicone resin (trade name: SCR1011) manufactured by Shin-Etsu Chemical Co., Ltd. was used as the silicone resin forming the phosphor layer 62.
  • the second transparent layer 63 is placed on the phosphor layer 62 and cured at room temperature.
  • quartz glass having the same thickness as the first transparent layer 61 is used for the second transparent layer 63. In this way, the phosphor sheet 6 is formed.
  • a light reflection film 64 is formed on the side surface of the phosphor sheet 6 by forming a silver film using a resistance heating vacuum deposition apparatus.
  • the thickness of the light reflecting film 64 is 200 nm.
  • an LED package including an electrode 1, a substrate 2, a package 3, a light emitting element 4, and a wire 5 is prepared, and the phosphor sheet prepared by the above method on the LED package. 6 is installed.
  • FIG. 4 shows a state in which the phosphor sheet 6 is installed in the package 3.
  • FIG. 4A shows an example in which an adhesive 31 is applied to the upper surface of the package 3 and the phosphor sheet 6 is placed thereon.
  • the adhesive 31 may be any adhesive as long as the phosphor sheet 6 and the package 3 are securely fixed, but a silicone adhesive is preferable.
  • a method may be used in which a base 32 on which the phosphor sheet 6 is placed is placed on the upper surface of the package 3 and the phosphor sheet 6 is fitted into the base 32.
  • the surface in contact with the side surface of the phosphor sheet 6 in the base 32 may have a shape that covers all the side surfaces of the phosphor sheet 6, and this surface may be covered with a light reflecting film 64 such as silver.
  • the side surface of the phosphor sheet 6 has a characteristic of reflecting light from the inside of the phosphor sheet 6 in a state where the phosphor sheet 6 is installed in the package 3.
  • the process of forming the light reflection film 64 can be omitted in the manufacturing process of the phosphor sheet 6.
  • the upper surface of the package 3 may be processed in advance so that the phosphor sheet 6 can be accommodated, and the phosphor sheet 6 may be fitted into that portion.
  • the light emitting device is manufactured by the above procedure.
  • FIG. 5 schematically shows the movement of the secondary light when the phosphor 65 that has absorbed the primary light emitted from the light emitting element 4 emits the secondary light.
  • light is refracted at the boundary between the phosphor layer 62 and the first transparent layer 61 or the second transparent layer 62, between the phosphor sheet and the outside air. The refraction of the light of the part is omitted.
  • FIG. 5A shows a phosphor sheet 6 used in the light emitting device 10 according to this embodiment
  • FIG. 5B shows a phosphor sheet 7 of a comparative example.
  • the phosphor sheet 7 is different from the phosphor sheet 6 only in that it does not have the light reflection layer 64, and the other configuration is the same.
  • the first transparent layer 61 and the second transparent layer 63 of the phosphor sheets 6 and 7 are made of quartz
  • the resin of the phosphor layer 62 is a silicone resin (trade name: SCR1011 manufactured by Shin-Etsu Chemical Co., Ltd.). is there.
  • the refractive index of quartz is about 1.54, and the refractive index of SRC1011 is about 1.53.
  • the primary light L8 emitted from the light emitting element enters the phosphor sheet 6 from the light incident surface 6a, is absorbed by the phosphor 65, and the phosphor 65 emits secondary lights L1 to L5. .
  • the secondary lights L2 to L4 are emitted from the light exit surface 6b as they are.
  • the secondary light L1 travels while reflecting the inside of the phosphor layer 62, is reflected by the light reflecting film 64, and is emitted from the light emitting surface 6b.
  • the secondary light L ⁇ b> 5 travels while reflecting inside the phosphor layer 62 sandwiched between the first transparent layer 61 and the second transparent layer 63, and the light reflecting film 64. And is emitted from the light exit surface 6b.
  • a phosphor sheet 7 shown in FIG. 5B will be described as a comparative example.
  • the primary light L8 emitted from the light emitting element enters the phosphor sheet 7 from the light incident surface 7a, is absorbed by the phosphor 65, and the phosphor 65 emits secondary lights L1 to L5. .
  • the secondary lights L2 to L4 are emitted from the light exit surface 7b as they are.
  • the secondary light L ⁇ b> 1 travels while reflecting the inside of the phosphor layer 62 and is emitted from the side surface 7 c of the phosphor sheet 7.
  • FIG. 5B the primary light L8 emitted from the light emitting element enters the phosphor sheet 7 from the light incident surface 7a, is absorbed by the phosphor 65, and the phosphor 65 emits secondary lights L1 to L5. .
  • the secondary lights L2 to L4 are emitted from the light exit surface 7b as they are.
  • the secondary light L ⁇ b> 1 travels while reflecting
  • the secondary light L ⁇ b> 5 travels while reflecting the inside of the phosphor layer 62 sandwiched between the first transparent layer 61 and the second transparent layer 63, and the phosphor sheet 7. The light is emitted from the side surface 7c.
  • the secondary light L1 and L5 are not irradiated to the irradiated object provided facing the light emitting device, and the irradiated object is not irradiated. Irradiation light quantity will decrease. According to the phosphor sheet 6 having the light reflecting film 64 on the side surface, it is possible to prevent a decrease in the amount of light applied to the irradiated object.
  • the phosphor sheet 8 is used.
  • the phosphor sheet 8 has a tapered shape in which the side surface 8c of the phosphor sheet 8 expands upward, and the side surface is perpendicular to the light incident surface and the light emitting surface, as shown in FIG. This is different from the phosphor sheet 6 used in the light emitting device.
  • the side surface 8c is tapered so that the light exit surface 8b is larger than the light incident surface 8a.
  • the phosphor sheet 8 has a configuration in which a first transparent layer 81, a phosphor layer 82, and a second transparent layer 83 are sequentially laminated, and a light reflection film 84 is provided along the tapered side surface 8c. . Details of each component are the same as those in the first embodiment, and thus description thereof is omitted.
  • the light reflecting film 84 is provided on the side surface 8c of the phosphor sheet 8, the light traveling from the inner side of the phosphor sheet 8 toward the side surface 8c is reflected with a high reflectance near the side surface c or the side surface 6c. Furthermore, since the side surface c has a tapered shape that expands upward, the incident angle of light incident on the side surface 8 c from the inside of the phosphor sheet 8 is increased, and a large amount of light is emitted without depending on the light reflecting film 84. Reflected by the side surface 8c.
  • FIG. 7 is a diagram illustrating a manufacturing process of the phosphor sheet 8 used in the light emitting device 20.
  • a metal mold 800 is prepared.
  • the cross section of the mold 800 has a trapezoidal shape with a wide upper portion and a narrow lower portion. That is, the side surface of the mold has a tapered shape that expands upward. The angle of the tapered side surface is determined by the required shape of the light emitting sheet 8.
  • FIG. 7A a metal mold 800 is prepared.
  • the cross section of the mold 800 has a trapezoidal shape with a wide upper portion and a narrow lower portion. That is, the side surface of the mold has a tapered shape that expands upward. The angle of the tapered side surface is determined by the required shape of the light emitting sheet 8.
  • FIG. 7A a metal mold 800 is prepared.
  • the cross section of the mold 800 has a trapezoidal shape with a wide upper portion and a narrow lower portion. That is, the side surface of the mold has a tapered shape that expands
  • a silicone resin as a first transparent layer material is poured or applied to a mold 87 and cured to form a first transparent layer 81.
  • the degree of curing may not be completely cured as long as it is cured to the extent that it does not mix with the layer to be formed next.
  • a resin containing a nanocrystalline phosphor as a phosphor layer material is poured or applied onto the first transparent layer 81 and cured to form a phosphor layer 82.
  • a silicone resin is poured or applied as a second transparent layer material on the phosphor layer 82 and cured to form the second transparent layer 83.
  • the mold 87 is removed as shown in FIG. 7E, and silver is deposited as a light reflecting film 84 on the side surface 8c as shown in FIG. 7F.
  • the silver deposition method is the same as that of the first embodiment.
  • the materials used for the first resin layer 81, the phosphor layer 82, and the second resin layer 83 may be the same material, or may be different from each other or partially.
  • Organic glass may be used as the first transparent layer material and the second transparent resin material.
  • Organic glass, like resin, can be poured into a mold and cured.
  • the process of vapor-depositing silver shown in FIG.8 (f) is not performed, but in the state which arrange
  • the light reflecting film 84 is preferably formed so as to cover the entire side surface of the phosphor sheet 8, and may be formed larger than the side surface of the phosphor sheet 8. By forming in this way, it is possible to irradiate the secondary light in the target direction without waste.
  • FIG. 8 shows a state in which the phosphor sheet 8 is installed in the package 3.
  • FIG. 8A shows the case where the adhesive 31 is applied to the upper surface of the package 3 and the phosphor sheet 8 is placed thereon.
  • the adhesive 31 may be any material as long as the phosphor sheet 8 and the package are securely fixed, but a silicone-based adhesive is preferable.
  • a method may be used in which a stand 33 on which the phosphor sheet 8 is accommodated is installed on the upper surface of the package 3 and the phosphor sheet 8 is fitted into the stand 33.
  • the surface in contact with the side surface of the phosphor sheet 8 is configured to cover the entire side surface of the phosphor sheet 8.
  • the secondary light can be irradiated in the target direction more efficiently.
  • the surface of the table 33 that contacts the side surface of the phosphor sheet 8 may be covered with a light reflecting layer 84 such as silver.
  • the side surface of the phosphor sheet 8 has a characteristic of reflecting light from the inside of the phosphor sheet 8 in a state where the phosphor sheet 8 is installed in the package 3. Moreover, according to this structure, the process of forming the light reflection film 84 can be omitted in the manufacturing process of the phosphor sheet 8.
  • the upper surface of the package 3 may be processed in advance into a shape that can accommodate the phosphor sheet 6, and the phosphor sheet 6 may be fitted into that portion.
  • the light emitting device 20 is manufactured by the above procedure.
  • the component irradiated in the unnecessary direction of the secondary light of the phosphor is reflected by the side surface or the light reflection film 84, and the light of the secondary light is irradiated in the direction of the target without waste.
  • the area of the light emitting surface 8b in the second transparent layer 83 is larger than the area of the light incident surface 8a of the primary light in the first transparent layer 81, the light out of the wavelength converted by the phosphor Since part of the light traveling downward can also be reflected upward, a brighter light emitting device can be obtained as compared with the first embodiment.
  • a phosphor sheet 80 is used in the light emitting device 30 of Embodiment 3.
  • the phosphor sheet 80 is different from the phosphor sheet 8 used in the light emitting device of Embodiment 2 shown in FIG. 6 only in that the light reflecting film 84 is not provided. Details of each component are the same as those in the first and second embodiments, and thus the description thereof is omitted.
  • FIG. 9 shows the light emitting device 30 in the present embodiment.
  • the phosphor sheet 80 used in the light emitting device 30 is manufactured by the manufacturing method shown in FIG. 7 of the second embodiment, and before forming the light reflecting film 84 shown in FIG. Is in state.
  • the manufacturing method will not be limited if the side surface of the fluorescent substance sheet 80 is formed in the taper shape which expands upwards, and it is comprised so that a light-projection surface may become larger than a light-incidence surface.
  • the primary light L8 emitted from the light emitting element is absorbed by the phosphor 85, and the phosphor 85 emits secondary lights L1 to L7.
  • the secondary lights L3 to L5 are emitted as they are from the upper surface of the light emitting device 30 which is the light emitting surface 8b.
  • the secondary lights L1, L2, L6, and L7 travel through the phosphor layer 82, are reflected by the side surface 8c of the phosphor sheet 80, and are emitted from the upper surface of the light emitting device 30 that is the light emitting surface 8b.
  • the incident angle of the secondary light to the side surface becomes small. Therefore, like the secondary light L1 and the secondary light L5 shown in FIG. 5B, light is easily emitted from the side surface, and the amount of light emitted from the light emitting surface 8b is reduced.
  • the side surface of the phosphor sheet is formed in a tapered shape, and the area of the light emitting surface 8b of the phosphor sheet is larger than the area of the light incident surface 8a, thereby reducing the amount of irradiation light. It becomes possible to prevent.
  • the phosphor sheet 60 is used.
  • the phosphor sheet 60 is different from the phosphor sheet 6 used in the light emitting device of Embodiment 1 shown in FIG. 1 in that two phosphor layers are laminated.
  • a first transparent layer 61, a first phosphor layer 621, a second phosphor layer 622, and a second transparent layer 63 are laminated in order from the light incident surface 6a side.
  • the first phosphor layer 621 and the second phosphor layer 622 include different nanocrystalline phosphors.
  • the second phosphor included in the second phosphor layer 622 preferably emits secondary light having a shorter wavelength than the first phosphor included in the first phosphor layer 621.
  • the first phosphor is a nanocrystalline phosphor that emits red light
  • the second phosphor is a nanocrystalline phosphor that emits green light.
  • the reason why the second phosphor preferably emits secondary light having a shorter wavelength than the first phosphor is that the phosphor absorbs light having energy larger than the respective excitation energy, and the fluorescence As a secondary color.
  • secondary light emitted from a phosphor having a large excitation energy such as a blue phosphor is easily absorbed by a phosphor having a small excitation energy such as a red phosphor. Therefore, by laminating in order of phosphors with long peak wavelengths in the order of the optical path of the primary light, the secondary light emitted from each phosphor is hardly absorbed again by the phosphors emitting other colors, and the desired color Balance can be easily obtained. Details of each component are the same as those in the first embodiment, and thus description thereof is omitted.
  • Embodiment 5 will be described with reference to FIG.
  • a phosphor sheet 86 is used.
  • the phosphor sheet 86 is different from the phosphor sheet 8 used in the light emitting device of Embodiment 2 shown in FIG. 6 in that two phosphor layers are laminated.
  • a first transparent layer 81, a first phosphor layer 821, a second phosphor layer 822, and a second transparent layer 83 are laminated in order from the light incident surface 8a side.
  • the first phosphor layer 821 and the second phosphor layer 822 include different nanocrystalline phosphors.
  • the second phosphor included in the second phosphor layer 822 preferably emits secondary light having a shorter wavelength than the first phosphor included in the first phosphor layer 821.
  • the first phosphor is a nanocrystalline phosphor that emits red light
  • the second phosphor is a nanocrystalline phosphor that emits green light.
  • the reason why it is preferable that the second phosphor emits secondary light having a shorter wavelength than that of the first phosphor is as described in the fourth embodiment.
  • the side edge type backlight system according to Embodiment 6 includes the light emitting device 10 according to the first embodiment, the light guide plate 91, and the reflection plate 92.
  • the primary light and the secondary light emitted from the light emitting device 10 enter the light guide plate 91 and are reflected by the reflection plate 92, so that the primary light and the secondary light are transmitted from the surface facing the reflection plate 92. It has a structure to take out.
  • the backlight system of the present embodiment can be used for a backlight system of video equipment such as a television.
  • the backlight system of this embodiment the brightness of display can be improved in video equipment.
  • the example in which the light emitting device of the present invention is used in the side-edge type backlight system has been described.
  • the light emitting device 10 of the first embodiment is used, but the light emitting device of any of the above embodiments may be used.
  • a side surface having light reflectivity can be formed by using a light reflecting film on the phosphor sheet or forming a side surface in a tapered shape.
  • the light-emitting device is suitable as a light-emitting device including a semiconductor light-emitting element that emits primary light and a phosphor sheet that includes a phosphor that absorbs the primary light and emits secondary light.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Led Device Packages (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention fournit un dispositif luminescent dans lequel les pertes de quantité de lumière générée par un corps fluorescent sont réduites. Plus précisément, l'invention concerne un dispositif luminescent équipé : d'un élément luminescent générant une lumière primaire; et d'une feuille fluorescente absorbant une partie de la lumière primaire pour générer une lumière secondaire. Cette feuille fluorescente est équipée : d'une face incidence de lumière ainsi que d'une face sortie de lumière se faisant mutuellement face; et d'une face latérale possédant des propriétés de réflexion de lumière afin de réfléchir la lumière provenant du côté interne de la feuille fluorescente.
PCT/JP2012/069161 2011-08-12 2012-07-27 Dispositif luminescent, feuille fluorescente ainsi que procédé de fabrication de celle-ci, et système de rétroéclairage WO2013024684A1 (fr)

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JP2011176615A JP2014199831A (ja) 2011-08-12 2011-08-12 発光装置、蛍光体シート、及びバックライトシステム、及び発光装置の製造方法

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WO2014203874A1 (fr) * 2013-06-18 2014-12-24 デクセリアルズ株式会社 Feuille électroluminescente
JP2016539501A (ja) * 2013-12-11 2016-12-15 深▲セン▼市華星光電技術有限公司 Ｌｅｄ実装部品及びその製造方法
JP2017049586A (ja) * 2015-09-03 2017-03-09 迎輝科技股▲分▼有限公司 光学フィルム及び該光学フィルムを備える発光装置
CN110246951A (zh) * 2018-03-09 2019-09-17 美蓓亚三美株式会社 荧光体片的制造方法
US10877346B2 (en) 2016-03-24 2020-12-29 Saturn Licensing Llc Light-emitting device, display apparatus, and illumination apparatus

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JP6562343B2 (ja) * 2015-03-13 2019-08-21 パナソニックＩｐマネジメント株式会社 波長制御フィルタ及びそれを用いた発光装置並びに照明装置
JP6509091B2 (ja) 2015-10-20 2019-05-08 富士フイルム株式会社 波長変換積層フィルム
JP6695067B2 (ja) * 2015-12-18 2020-05-20 パナソニックＩｐマネジメント株式会社 発光装置
JP2018166197A (ja) * 2017-03-28 2018-10-25 株式会社朝日ラバー Ｌｅｄ装置、ｌｅｄ発光色変換用蛍光体含有シート及びｌｅｄ装置の製造方法

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JP2006269717A (ja) * 2005-03-24 2006-10-05 Kyocera Corp 発光装置および照明装置
JP2009283441A (ja) * 2008-04-25 2009-12-03 Sony Corp 発光装置、表示装置および色変換シート
JP2010087324A (ja) * 2008-10-01 2010-04-15 Minebea Co Ltd 発光装置

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JP2006269717A (ja) * 2005-03-24 2006-10-05 Kyocera Corp 発光装置および照明装置
JP2009283441A (ja) * 2008-04-25 2009-12-03 Sony Corp 発光装置、表示装置および色変換シート
JP2010087324A (ja) * 2008-10-01 2010-04-15 Minebea Co Ltd 発光装置

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014203874A1 (fr) * 2013-06-18 2014-12-24 デクセリアルズ株式会社 Feuille électroluminescente
JP2015000967A (ja) * 2013-06-18 2015-01-05 デクセリアルズ株式会社 蛍光体シート
US9873832B2 (en) 2013-06-18 2018-01-23 Dexerials Corporation Phosphor sheet
JP2016539501A (ja) * 2013-12-11 2016-12-15 深▲セン▼市華星光電技術有限公司 Ｌｅｄ実装部品及びその製造方法
JP2017049586A (ja) * 2015-09-03 2017-03-09 迎輝科技股▲分▼有限公司 光学フィルム及び該光学フィルムを備える発光装置
US10877346B2 (en) 2016-03-24 2020-12-29 Saturn Licensing Llc Light-emitting device, display apparatus, and illumination apparatus
US11294228B2 (en) 2016-03-24 2022-04-05 Saturn Licensing Llc Light-emitting device, display apparatus, and illumination apparatus
US11630344B2 (en) 2016-03-24 2023-04-18 Saturn Licensing Llc Light-emitting device, display apparatus, and illumination apparatus
CN110246951A (zh) * 2018-03-09 2019-09-17 美蓓亚三美株式会社 荧光体片的制造方法
CN110246951B (zh) * 2018-03-09 2024-05-03 美蓓亚三美株式会社 荧光体片的制造方法

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