WO2021176912A1 - 蛍光体プレート、及び発光装置 - Google Patents
蛍光体プレート、及び発光装置 Download PDFInfo
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- WO2021176912A1 WO2021176912A1 PCT/JP2021/003451 JP2021003451W WO2021176912A1 WO 2021176912 A1 WO2021176912 A1 WO 2021176912A1 JP 2021003451 W JP2021003451 W JP 2021003451W WO 2021176912 A1 WO2021176912 A1 WO 2021176912A1
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- phosphor plate
- phosphor
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Images
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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
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
- C09K11/7792—Aluminates
-
- 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
-
- 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
- C09K11/0883—Arsenides; Nitrides; Phosphides
-
- 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
- C09K11/64—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing aluminium
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/505—Wavelength conversion elements characterised by the shape, e.g. plate or foil
Definitions
- the present invention relates to a phosphor plate and a light emitting device.
- Patent Document 1 describes a wavelength conversion member in which an inorganic phosphor is dispersed in a glass matrix (Claim 1 of Patent Document 1). According to the same document, it is described that the shape of the wavelength conversion member is not limited and may be plate-shaped (paragraph 0054).
- the present inventor has found that when an ⁇ -type phosphor is used as the inorganic phosphor, the internal quantum efficiency and the external quantum efficiency may decrease in the phosphor plate.
- the optical characteristics of the phosphor plate can be stably evaluated by using T1 / R1 having a wavelength of 455 nm, which is the excitation light, as an index, and the lower limit of the index T1 / R1 can be set. It has been found that the external quantum efficiency of the phosphor plate is improved by setting the value to a predetermined value or more, and the present invention has been completed.
- a phosphor plate comprising a plate-like composite containing an inorganic base material which is a sintered product of two or more kinds of metal oxides containing SiO 2 and a phosphor contained in the inorganic base material.
- the fluorophore contains an ⁇ -type sialone fluorophore.
- Group III nitride semiconductor light emitting device and The phosphor plate provided on one surface of the group III nitride semiconductor light emitting device and A light emitting device is provided.
- a phosphor plate having excellent external quantum efficiency and a light emitting device using the same are provided.
- FIG. 1 It is a schematic diagram which shows an example of the structure of the phosphor plate of this embodiment.
- (A) is a cross-sectional view schematically showing the structure of a flip-chip type light emitting device
- (b) is a cross-sectional view schematically showing the structure of a wire bonding type light emitting element.
- the phosphor plate of this embodiment will be outlined.
- the outline of the phosphor plate of this embodiment will be described.
- the phosphor plate of the present embodiment has a plate shape containing an inorganic base material which is a sintered product of two or more kinds of metal oxides containing SiO 2 and an ⁇ -type sialon phosphor contained in the inorganic base material. It is composed of a plate-shaped member having a composite.
- the phosphor plate can function as a wavelength converter that converts the irradiated blue light into orange light and emits light.
- the phosphor plate has T1 and R1 of 1.5 ⁇ 10 ⁇ , where T1 is the intensity of transmitted light having a wavelength of 455 nm and R1 is the intensity of reflected light having a wavelength of 455 nm, which is measured using a quantum efficiency measuring device. It is configured to satisfy 2 ⁇ T1 / R1 ⁇ 5.0 ⁇ 10-2.
- the optical characteristics of the phosphor plate can be stably evaluated by using T1 / R1 having a wavelength of 455 nm, which is the excitation light, as an index, and the lower limit of the index T1 / R1 is set to the above upper limit value. It was found that the external quantum efficiency of the phosphor plate can be improved by the above.
- T1 represents transmitted light having a wavelength of 455 nm (blue light)
- R1 represents a reflectance having a wavelength of 455 nm (blue light).
- This blue light having a wavelength of 455 nm becomes excitation light for causing the phosphor plate to emit light. Therefore, the absorption of a large amount of excitation light having a wavelength of 455 nm by the phosphor plate contributes to the improvement of optical characteristics.
- T1 is a very small value of about 1/100 as compared with R1, and T1 ⁇ R1.
- T1 / R1 when T1 / R1 becomes large, it means that R1 becomes small, that is, the excitation light having a wavelength of 455 nm is absorbed by the phosphor plate. Therefore, it is considered that the external quantum efficiency is increased by setting the lower limit of the index T1 / R1 to be equal to or higher than the above lower limit value.
- the intensity of transmitted light having a wavelength of 455 nm is T1
- the intensity of reflected light having a wavelength of 455 nm is R1
- the intensity of transmitted light having a wavelength of 600 nm is T2
- the intensity of transmitted light having a wavelength of 600 nm is measured using a quantum efficiency measuring device.
- Let the intensity of the reflected light be R2.
- the phosphor plate to be measured may have a thickness of about 0.17 mm to 0.22 mm.
- the incident angle of the excitation light having a wavelength of 455 nm or 600 nm may be 90 degrees, and the reflection angle / transmission angle may be 45 degrees.
- the lower limit of T1 / R1 is 1.5 ⁇ 10 -2 or more, preferably 1.6 ⁇ 10 -2 or more, and more preferably 1.7 ⁇ 10 -2 or more. Thereby, the external quantum efficiency and the internal quantum efficiency can be improved.
- the upper limit of T1 / R1 may be, for example, 5.0 ⁇ 10 -2 or less, preferably 4.0 ⁇ 10 -2 or less, and more preferably 3.5 ⁇ 10 -2 or less.
- the phosphor plate may be configured such that T1 and T2 satisfy 8.0 ⁇ 10 -2 ⁇ T1 / T2 ⁇ 2.5 ⁇ 10 -1.
- the lower limit of T1 / T2 is 8.0 ⁇ 10 -2 or more, preferably 9.0 ⁇ 10 -2 or more, and more preferably 1.0 ⁇ 10 -1 or more. Thereby, the external quantum efficiency and the internal quantum efficiency can be improved.
- the upper limit of T1 / T2 may be, for example, 2.5 ⁇ 10 -1 or less, preferably 2.3 ⁇ 10 -1 or less, and more preferably 2.0 ⁇ 10 -1 or less.
- the phosphor plate may be configured to satisfy 8.5 ⁇ 10 -1 ⁇ T2 / R2 ⁇ 9.5 ⁇ 10 -1.
- the lower limit of T2 / R2 is 8.5 ⁇ 10 -1 or more, preferably 8.8 ⁇ 10 -1 or more, and more preferably 9.0 ⁇ 10 -1 or more. Thereby, the external quantum efficiency and the internal quantum efficiency can be improved.
- the upper limit of T2 / R2 may be, for example, 9.5 ⁇ 10 -1 or less, preferably 9.4 ⁇ 10 -1 or less, and more preferably 9.3 ⁇ 10 -1 or less.
- the phosphor plate may be configured to satisfy 5.0 ⁇ R1 / R2 ⁇ 6.5.
- the lower limit of R1 / R2 is 5.0 or more, preferably 5.1 or more, and more preferably 5.2 or more. Thereby, the external quantum efficiency and the internal quantum efficiency can be improved.
- the upper limit of R1 / R2 may be, for example, 6.5 or less, preferably 6.4 or less, and more preferably 6.3.
- appropriately performing annealing treatment and acid treatment in the manufacturing process of ⁇ -type sialon phosphor can set T1 / R1, T1 / T2, T2 / R2, and R1 / R2 in a desired numerical range. It can be mentioned as an element to make it.
- the peak wavelength of the wavelength conversion light emitted from the phosphor plate is preferably 585 nm or more and 605 nm or less. Further, according to this, by combining a phosphor plate with a light emitting element that emits blue light, it is possible to obtain a light emitting device that emits orange light having high brightness.
- the ⁇ -type sialone phosphor and the inorganic base material are mixed.
- the composite may have a structure in which an ⁇ -type sialon phosphor is dispersed in a glass matrix (sintered product of SiO 2 ) constituting an inorganic base material.
- the ⁇ -type sialon phosphor may be uniformly dispersed in the inorganic base material (sintered metal oxide) in the form of particles.
- the ⁇ -type sialone phosphor of the present embodiment contains an ⁇ -type sialon phosphor containing an Eu element represented by the following general formula (1).
- General formula (1) (M) m (1-x) / p (Eu) mx / 2 (Si) 12- (m + n) (Al) m + n (O) n (N) 16-n ...
- M represents one or more elements selected from the group consisting of Li, Mg, Ca, Y and lanthanide elements (excluding La and Ce), and p is the valence of the M element, 0. ⁇ X ⁇ 0.5, 1.5 ⁇ m ⁇ 4.0, 0 ⁇ n ⁇ 2.0. n may be, for example, 2.0 or less, 1.0 or less, or 0.8 or less.
- the solid solution composition of ⁇ -type sialon is such that m Si—N bonds of ⁇ -type silicon nitride unit crystals (Si 12 N 16 ) are converted into Al—N bonds and n Si—N bonds are converted into Al—O bonds.
- m / p cations M, Eu
- M, Eu m / p cations
- ⁇ -type sialone is stabilized in a wide composition range, and by substituting a part of it with Eu, it is excited by light in a wide wavelength range from ultraviolet to blue, and from yellow. A phosphor exhibiting orange visible light is obtained.
- the solid solution composition cannot be strictly defined by composition analysis or the like.
- the crystal phase of alpha-SiAlON, alpha-sialon single-phase is preferred, beta-sialon as other crystal phases, aluminum nitride or its polytypoid may include Ca 2 Si 5 N 8, CaAlSiN 3 and the like.
- a method for producing an ⁇ -type sialon phosphor there is a method in which a mixed powder composed of a compound of silicon nitride, aluminum nitride and an invading solid solution element is heated and reacted in a high temperature nitrogen atmosphere. In the heating step, some of the constituents form a liquid phase, and the substance moves to this liquid phase to form an ⁇ -type sialon solid solution.
- a plurality of equiaxed primary particles are sintered to form massive secondary particles.
- the primary particles in the present embodiment refer to the smallest particles having the same crystal orientation in the particles and capable of existing independently.
- the lower limit of the average particle size of the ⁇ -type sialon phosphor is preferably 5 ⁇ m or more, and more preferably 10 ⁇ m or more.
- the upper limit of the average particle size of the ⁇ -type sialon phosphor is preferably 30 ⁇ m or less, more preferably 20 ⁇ m or less.
- the average particle size of the ⁇ -type sialone phosphor is the dimension of the secondary particles.
- the average particle size of the ⁇ -type Sialon phosphor is the passage from the small particle size side in the volume-based particle size distribution obtained by measuring with a particle size distribution measuring device (Microtrac MT3000II manufactured by Microtrack Bell Co., Ltd.). Minute integration (integrated passing fraction) 50% particle size D50.
- the lower limit of the content of the ⁇ -type sialon phosphor is, for example, 5 Vol% or more, preferably 10 Vol% or more, and more preferably 15 Vol% or more in terms of volume with respect to the entire complex. Thereby, the emission intensity in the thin-layer phosphor plate can be increased. In addition, the light conversion efficiency of the phosphor plate can be improved.
- the upper limit of the content of the ⁇ -type sialon phosphor is, for example, 50 Vol% or less, preferably 45 Vol% or less, and more preferably 40 Vol% or less in terms of volume with respect to the entire complex. It is possible to suppress a decrease in thermal conductivity of the phosphor plate.
- the lower limit of the content of the ⁇ -type sialon phosphor and the inorganic base material is, for example, 95 Vol% or more, preferably 98 Vol% or more, more preferably 99 Vol% or more in terms of volume with respect to the entire composite. That is, it means that the composite constituting the phosphor plate contains the ⁇ -type sialon phosphor and the inorganic base material as main components. As a result, durability can be improved and stable luminous efficiency can be realized.
- the upper limit of the contents of the ⁇ -type sialon phosphor and the inorganic base material is not particularly limited, but may be, for example, 100 Vol% or less in terms of volume with respect to the entire composite.
- the surface of at least the main surface or both the main surface and the back surface of the phosphor plate may be surface-treated.
- Examples of the surface treatment include grinding using a diamond grindstone and polishing, lapping, polishing and the like.
- the surface roughness Ra on the main surface of the phosphor plate is, for example, 0.1 ⁇ m or more and 2.0 ⁇ m or less, preferably 0.3 ⁇ m or more and 1.5 ⁇ m or less.
- the surface roughness Ra on the back surface of the phosphor plate is, for example, 0.1 ⁇ m or more and 2.0 ⁇ m or less, preferably 0.3 ⁇ m or more and 1.5 ⁇ m or less.
- the surface roughness By setting the surface roughness to the above upper limit value or less, it is possible to suppress variations in light extraction efficiency and light intensity in the in-plane direction. By setting the surface roughness to the above lower limit value or more, it is expected that the adhesion to the adherend can be improved.
- the upper limit of the light transmittance in blue light of 450 nm is, for example, 10% or less, preferably 5% or less, and more preferably 1% or less. As a result, it is possible to prevent blue light from passing through the phosphor plate, so that orange with high brightness can be emitted.
- the light transmittance in blue light of 450 nm can be reduced.
- the lower limit of the light transmittance in blue light of 450 nm is not particularly limited, but may be, for example, 0.01% or more.
- the method for producing a phosphor plate of the present embodiment includes a step (1) of obtaining a mixture containing two or more kinds of metal oxides containing SiO 2 and an ⁇ -type sialon phosphor, and a step of calcining the obtained mixture (1). 2) and may have.
- the ⁇ -type sialon phosphor or metal oxide powder used as a raw material in the step (1) is preferably as high in purity as possible, and the impurities of elements other than the constituent elements are preferably 0.1% or less.
- ⁇ -type sialon phosphor particles used as the raw material are not pulverized as much as possible and impurities from the apparatus are not mixed as much as possible during mixing is preferable.
- the raw material metal oxide glass powder ( powder containing SiO 2 ) may be used.
- SiO 2 powder (silica powder) or a general glass raw material can be used. These may be used alone or in combination of two or more.
- SiO 2 powder except the components other than SiO 2 contained in the unavoidable, is intended to include only SiO 2.
- the softening point of the glass (silica glass) obtained by firing the SiO 2 powder is, for example, about 1600 to 1700 ° C.
- the content of SiO 2 in the silica glass may be, for example, 98% by mass or more or 99% by mass or more in terms of mass.
- the general glass raw material may contain other components in addition to SiO 2.
- Other components include, for example, Al 2 O 3 , BaO, Sb 2 O 3 , SrO, Na 2 O, Na 2 O 3 , CaO, MgO, K 2 O, La 2 O 3 , CeO 2 , Y 2 O 3 , ZrO 2 , ZnO 2 , As 2 O 3 , TiO 2 , B 2 O 3 , Cr 2 O 3 , PbO, V 2 O 5 , SnO 2, and the like.
- carbonates, hydroxides and oxalates which become these metal oxides by thermal decomposition may be blended as raw materials. By including other components, the softening point of the glass can be adjusted to be low.
- the step (2) SiO 2 is sintered to form a glass matrix, and a phosphor plate in which ⁇ -type sialon phosphor particles are dispersed is formed in the glass matrix.
- the phosphor plate is formed by melting SiO 2 , dispersing the phosphor in the molten glass, forming the lath into a plate shape, and cooling the lath.
- the ⁇ -type sialone phosphor can exist in a particle state without melting in the glass.
- the firing temperature may be within ⁇ 400 ° C., which is the softening point of the glass, and preferably within ⁇ 300 ° C., which is the softening point of the glass.
- the firing method may be normal pressure sintering or pressure sintering, but in order to suppress deterioration of the characteristics of the ⁇ -type sialon phosphor and obtain a dense composite, it is easier to make it denser than normal pressure sintering. Pressure sintering is preferred.
- the pressure sintering method examples include hot press sintering, discharge plasma sintering (SPS), and hot isotropic pressure sintering (HIP).
- the pressure is preferably 10 MPa or more, preferably 30 MPa or more, and preferably 100 MPa or less.
- the firing atmosphere is preferably a non-oxidizing inert gas such as nitrogen or argon, or a vacuum atmosphere for the purpose of preventing the oxidation of ⁇ -type sialon. From the above, the phosphor plate of the present embodiment is obtained.
- the surface of the plate-shaped composite in the obtained phosphor plate may be subjected to known surface treatments such as polishing treatment, plasma treatment and surface coating treatment as long as the effects of the present invention are not impaired.
- the light emitting device of this embodiment will be described.
- the light emitting device of the present embodiment includes a group III nitride semiconductor light emitting device (light emitting element 20) and the above-mentioned phosphor plate 10 provided on one surface of the group III nitride semiconductor light emitting device.
- the group III nitride semiconductor light emitting device includes, for example, an n layer, a light emitting layer, and a p layer composed of a group III nitride semiconductor such as an AlGaN, GaN, or InAlGaN-based material.
- a group III nitride semiconductor light emitting device a blue LED that emits blue light can be used.
- the phosphor plate 10 may be arranged directly on one surface of the light emitting element 20, but may be arranged via a light transmitting member or a spacer.
- the disk-shaped phosphor plate 100 (fluorescent wafer) shown in FIG. 1 may be used, but a single piece of the phosphor plate 100 is used. Can be used.
- FIG. 1 is a schematic view showing an example of the configuration of the phosphor plate.
- the lower limit of the thickness of the phosphor plate 100 shown in FIG. 1 is, for example, 50 ⁇ m or more, preferably 80 ⁇ m or more, and more preferably 100 ⁇ m or more.
- the upper limit of the thickness of the phosphor plate 100 is, for example, 1 mm or less, preferably 500 ⁇ m or less, and more preferably 300 ⁇ m or less.
- the thickness of the phosphor plate 100 can be appropriately adjusted by grinding or the like after being obtained in the above manufacturing process.
- the disk-shaped phosphor plate 100 is superior in durability and transportability because the occurrence of chipping and cracking at the corners is suppressed as compared with the case of the square shape.
- FIGS. 2 (a) and 2 (b) An example of the above semiconductor device is shown in FIGS. 2 (a) and 2 (b).
- FIG. 2A is a cross-sectional view schematically showing the configuration of the flip-chip type light emitting device 110
- FIG. 2B is a cross-sectional view schematically showing the configuration of the wire bonding type light emitting device 120.
- the light emitting device 110 of FIG. 2A has a substrate 30, a light emitting element 20 electrically connected to the substrate 30 via a solder 40 (die bond material), and fluorescence provided on the light emitting surface of the light emitting element 20.
- a body plate 10 is provided.
- the flip-chip type light emitting device 110 may have either a face-up type or a face-down type structure.
- the light emitting device 120 of FIG. 2B is provided on the light emitting surface of the substrate 30, the light emitting element 20 electrically connected to the substrate 30 via the bonding wire 60 and the electrode 50, and the light emitting element 20.
- the phosphor plate 10 is provided. In FIG.
- the light emitting element 20 and the phosphor plate 10 are attached by a known method, and may be attached by, for example, a silicone-based adhesive or a heat fusion method. Further, the light emitting device 110 and the light emitting device 120 may be entirely sealed with a transparent sealing material.
- the individualized phosphor plate 10 may be attached to the light emitting element 20 mounted on the substrate 30.
- a plurality of light emitting elements 20 may be attached to the large-area phosphor plate 100, and then the light emitting elements 20 with the phosphor plate 10 may be individually separated by dicing.
- the large-area phosphor plate 100 may be attached to the semiconductor wafer on which the plurality of light emitting elements 20 are formed on the surface, and then the semiconductor wafer and the phosphor plate 100 may be individually separated.
- Example 1 ⁇ -type sialone phosphor A
- Example 2 ⁇ -type sialone phosphor A
- 62.4 parts by mass of silicon nitride powder (manufactured by Ube Kosan Co., Ltd., E grade) and 22.5 parts by mass of aluminum nitride powder (manufactured by Tokuyama Co., Ltd., E grade) are used as the composition of the raw material powder.
- Europium oxide powder (RU grade manufactured by Shinetsu Chemical Industry Co., Ltd.) is 2.2 parts by mass
- calcium nitride powder manufactured by High Purity Chemical Research Institute) is 12.9 parts by mass
- the opening is 250 ⁇ m.
- Raw material mixed powder was obtained through a nylon sieve. 120 g of the raw material mixed powder was filled in a cylindrical boron nitride container (manufactured by Denka Co., Ltd., N-1 grade) with a lid having an internal volume of 0.4 liter.
- This raw material mixed powder was heat-treated at 1800 ° C. for 16 hours in an atmospheric pressure nitrogen atmosphere in an electric furnace of a carbon heater together with the container. Since calcium nitride contained in the raw material mixed powder is easily hydrolyzed in the air, the boron nitride container filled with the raw material mixed powder is immediately set in the electric furnace after being taken out from the glove box and immediately vacuum exhausted. However, the reaction of calcium nitride was prevented.
- the synthetic product was lightly crushed in a mortar and passed through a sieve having a mesh size of 150 ⁇ m to obtain a fluorescent powder.
- the obtained fluorescent powder was filled in a cylindrical boron nitride container with a lid having an internal volume of 0.4 liter, and annealed in an electric furnace at 1450 ° C. for 8 hours in a hydrogen atmosphere.
- ⁇ Acid treatment> 50 ml of 50% hydrofluoric acid and 50 ml of 70% nitric acid were mixed to prepare a mixed stock solution.
- 300 ml of distilled water was added to the mixed stock solution to dilute the concentration of the mixed stock solution to 25% to prepare 400 ml of a mixed acid aqueous solution.
- 30 g of the powder composed of the above-mentioned ⁇ -type sialon phosphor particles is added, the temperature of the mixed acid aqueous solution is maintained at 80 ° C., and the acid is immersed for 60 minutes while stirring at a rotation speed of 500 rpm using a magnetic stirrer. Processing was carried out.
- the acid-treated powder was thoroughly washed with distilled water, filtered, dried, and then passed through a sieve having a mesh size of 45 ⁇ m to prepare a powder composed of ⁇ -type sialon phosphor particles of Example 1.
- Example 2 ⁇ -type sialone phosphor B Except that the mixed acid aqueous solution used in Example 1 was used, the temperature of the mixed acid aqueous solution was maintained at 80 ° C., and the acid treatment was carried out by immersing for 60 minutes while stirring at a rotation speed of 300 rpm using a magnetic stirrer. A powder composed of ⁇ -type sialon phosphor particles of Example 2 was prepared by the same procedure as in Example 1.
- the composition of the raw material powder is 62.4 parts by mass of silicon nitride powder (manufactured by Ube Kosan Co., Ltd., E10 grade) and 22.5 parts by mass of aluminum nitride powder (manufactured by Tokuyama Co., Ltd., E grade).
- Europium oxide powder (RU grade manufactured by Shinetsu Chemical Industry Co., Ltd.) is 2.2 parts by mass
- calcium nitride powder manufactured by High Purity Chemical Research Institute
- the opening is 250 ⁇ m.
- Raw material mixed powder was obtained through a nylon sieve. 120 g of the raw material mixed powder was filled in a cylindrical boron nitride container (manufactured by Denka Co., Ltd., N-1 grade) with a lid having an internal volume of 0.4 liter.
- This raw material mixed powder was heat-treated at 1800 ° C. for 16 hours in an atmospheric pressure nitrogen atmosphere in an electric furnace of a carbon heater together with the container. Since calcium nitride contained in the raw material mixed powder is easily hydrolyzed in the air, the boron nitride container filled with the raw material mixed powder is immediately set in the electric furnace after being taken out from the glove box and immediately vacuum exhausted. However, the reaction of calcium nitride was prevented.
- the synthetic product was lightly crushed in a mortar and passed through a sieve having a mesh size of 150 ⁇ m to obtain a phosphor powder composed of ⁇ -type sialon phosphor C.
- Example 1 As a raw material for the phosphor plate of Example 1, glass powder and a Ca- ⁇ type sialone phosphor (obtained ⁇ type sialon phosphor A, average particle size D50: 15 ⁇ m) were used. Glass powder and Ca- ⁇ type sialon phosphor powder were dry-mixed in agate mortar at a predetermined ratio. The mixed raw material was disaggregated through a nylon mesh sieve having an opening of 75 ⁇ m to obtain a raw material mixed powder.
- a hot press jig filled with this raw material mixed powder was set in a multipurpose high temperature furnace (manufactured by Fuji Dempa Kogyo Co., Ltd., High Multi 5000) with a carbon heater.
- the inside of the furnace was evacuated to 0.1 Pa or less, and the upper and lower punches were pressurized with a press pressure of 55 MPa while maintaining the reduced pressure state.
- the temperature was raised to 1450 ° C. at a rate of 5 ° C. per minute. After reaching 1450 ° C., heating was stopped, the mixture was slowly cooled to room temperature, and decompressed.
- the calcined product having an outer diameter of 30 mm was collected, and the outer peripheral portion was ground using a surface grinding machine and a cylindrical grinding machine to obtain a disk-shaped phosphor plate having a diameter of 25 mm and a thickness of 1.5 mm.
- a state in which Ca- ⁇ type sialon phosphor particles were dispersed between the glass matrix phases was observed.
- the surface roughness Ra of the main surface of the phosphor plate of Example 1 measured using a surface roughness measuring instrument (manufactured by Mitutoyo, SJ-400) in accordance with JIS B0601: 1994 is 1.0 ⁇ m.
- the surface roughness Ra of the back surface opposite to the main surface was 1.0 ⁇ m.
- Example 2 A disk-shaped phosphor plate was obtained in the same manner as in Example 1 except that the obtained ⁇ -type sialon phosphor B was used as the Ca- ⁇ -type sialon phosphor.
- Example 1 A disk-shaped phosphor plate was obtained in the same manner as in Example 1 except that the obtained ⁇ -type sialon phosphor C was used as the Ca- ⁇ -type sialon phosphor.
- T1 represents the intensity of transmitted light having a wavelength of 455 nm
- T2 represents the intensity of transmitted light having a wavelength of 600 nm
- R1 represents the intensity of reflected light having a wavelength of 455 nm
- R2 represents the intensity of reflected light having a wavelength of 600 nm.
- the obtained phosphor plate was evaluated for the following evaluation items.
- the obtained disk-shaped phosphor plate having a thickness of 1.5 mm was thinly processed to the thickness shown in Table 1 to prepare a test plate.
- Quantum efficiency measuring device QE-2100HMB, Otsuka having a system for independently evaluating reflected light (R1, R2) and transmitted light (T1, T2) at excitation light: 455 nm and 600 nm for the obtained test plate. Measured using (manufactured by Electronics Co., Ltd.). The results are shown in Table 1.
- Monochromatic light separated into a wavelength of 455 nm from a light emitting light source (Xe lamp) was introduced into the integrating sphere as excitation light of a phosphor using an optical fiber.
- the phosphor plate was irradiated with this monochromatic light, and the fluorescence spectrum of the phosphor plate was measured using a quantum efficiency measuring device. From the obtained spectral data, the number of excited reflected light photons (Qref) and the number of fluorescent photons (Qem) were calculated.
- the number of excited reflected light photons was calculated in the same wavelength range as the number of excited light photons, and the number of fluorescent photons was calculated in the range of 480 to 800 nm.
- a standard reflector (Spectralon (registered trademark) manufactured by Labsphere) having a reflectance of 99% was attached to the opening of the integrating sphere, and the spectrum of excitation light having a wavelength of 455 nm was measured. At that time, the number of excited photons (Qex) was calculated from the spectrum in the wavelength range of 435 to 470 nm. It was determined by the 455 nm light absorption rate, internal quantum efficiency, and the following calculation formula of each of the phosphors of Examples and Comparative Examples.
- the phosphor plates of Examples 1 and 2 showed excellent results in internal quantum efficiency and external quantum efficiency as compared with Comparative Example 1. Therefore, by using the phosphor plates of Examples 1 and 2, a light emitting device having excellent brightness can be realized.
- Fluorescent plate 20 Light emitting element 30 Substrate 40 Solder 50 Electrode 60 Bonding wire 70 Recess 100 Fluorescent plate 100 Light emitting device 120 Light emitting device 130 LED package
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Abstract
Description
SiO2を含む2種類以上の金属酸化物の焼結物である無機母材と、前記無機母材中に含まれる蛍光体と、を含む板状の複合体を備える蛍光体プレートであって、
前記蛍光体は、α型サイアロン蛍光体を含み、
下記の手順で測定される当該蛍光体プレートの、波長455nmの透過光の強度をT1、波長455nmの反射光の強度をR1としたとき、
T1、R1が、1.5×10-2≦T1/R1≦5.0×10-2を満たす、蛍光体プレートが提供される。
(手順)
当該蛍光体プレートにおいて、量子効率測定装置を用いて、波長455nmおよび波長600nmの各波長における、反射光および透過光の強度を測定する。
III族窒化物半導体発光素子と、
前記III族窒化物半導体発光素子の一面上に設けられた、上記の蛍光体プレートと、
を備える、発光装置が提供される。
本実施形態の蛍光体プレートは、SiO2を含む2種類以上の金属酸化物の焼結物である無機母材と、無機母材中に含まれるα型サイアロン蛍光体と、を含む板状の複合体を備える板状部材で構成される。
T1は波長455nm(青色光)の透過光、R1は波長455nm(青色光)の反射率を表す。この波長455nmの青色光は、蛍光体プレートを発光させる為の励起光となる。そのため、波長455nmの励起光が蛍光体プレートにより多く吸収されることは、光学特性の向上に寄与することになる。
今回、指標T1/R1が大きくなるほど、T1とR1の値の差が大きくなることを示す。ここで、T1は、R1と比較すると1/100程度と非常に小さい値、T1<<R1となる。このため、T1/R1が大きくなることは、R1が小さくなること、すなわち、波長455nmの励起光が蛍光体プレートにより吸収されていることを示す。したがって、指標T1/R1の下限を上記下限値以上とすることによって、外部量子効率が大きくなると考えられる。
測定対象の蛍光体プレートは、厚みが約0.17mm~0.22mmのものを使用してもよい。
波長455nmや波長600nmの励起光の入射角が90度、反射角・透過角が45度としてもよい。
T1/R1の上限は、例えば、5.0×10-2以下、好ましくは4.0×10-2以下、より好ましくは3.5×10-2以下でもよい。
T1/T2の下限は、8.0×10-2以上、好ましくは9.0×10-2以上、より好ましくは1.0×10-1以上である。これにより、外部量子効率および内部量子効率を向上できる。
T1/T2の上限は、例えば、2.5×10-1以下、好ましくは2.3×10-1以下、より好ましくは2.0×10-1以下でもよい。
T2/R2の下限は、8.5×10-1以上、好ましくは8.8×10-1以上、より好ましくは9.0×10-1以上である。これにより、外部量子効率および内部量子効率を向上できる。
T2/R2の上限は、例えば、9.5×10-1以下、好ましくは9.4×10-1以下、より好ましくは9.3×10-1以下でもよい。
R1/R2の下限は、5.0以上、好ましくは5.1以上、より好ましくは5.2以上である。これにより、外部量子効率および内部量子効率を向上できる。
R1/R2の上限は、例えば、6.5以下、好ましくは6.4以下、より好ましくは6.3でもよい。
本実施形態のα型サイアロン蛍光体は、下記一般式(1)で表されるEu元素を含有するα型サイアロン蛍光体を含むものである。
(M)m(1-x)/p(Eu)mx/2(Si)12-(m+n)(Al)m+n(O)n(N)16-n ・・一般式(1)
上記蛍光体プレートの主面における表面粗さRaは、例えば、0.1μm以上2.0μm以下、好ましくは0.3μm以上1.5μm以下である。
一方、上記蛍光体プレートの裏面における表面粗さRaは、例えば、0.1μm以上2.0μm以下、好ましくは0.3μm以上1.5μm以下である。
上記表面粗さを上記上限値以下とすることで、光の取り出し効率や、面内方向における光強度のバラツキを抑制できる。上記表面粗さを上記下限値以上とすることで、被着体との密着性を高められることが期待される。
なお、450nmの青色光における光線透過率の下限値は、特に限定されないが、例えば、0.01%以上としてもよい。
原料の金属酸化物として、ガラス粉末(SiO2を含む粉末)を使用してもよい。
ガラス粉末としては、SiO2粉末(シリカ粉末)や、一般的なガラス原料を使用できる。これらを単独で用いても2種以上を組み合わせて用いてもよい。
SiO2粉末を焼成して得られたガラス(シリカガラス)の軟化点は、例えば、約1600~1700℃になる。シリカガラス中のSiO2の含有量は、例えば、質量換算で98質量%以上、99質量%以上でもよい。
α型サイアロン蛍光体は、ガラス中に溶融せずに粒子状態で存在できる。
焼成雰囲気はα型サイアロンの酸化を防ぐ目的のため、窒素やアルゴンなどの非酸化性の不活性ガス、もしくは真空雰囲気下が好ましい。
以上により、本実施形態の蛍光体プレートが得られる。
得られた蛍光体プレート中の板状の複合体の表面は、本発明の効果を損なわない範囲において研磨処理、プラズマ処理や表面コート処理等の公知の表面処理などが施されてもよい。
蛍光体プレート10は、発光素子20の一面上に直接配置されてもよいが、光透過性部材またはスペーサーを介して配置され得る。
図1に示す蛍光体プレート100の厚みの下限は、例えば、50μm以上、好ましくは80μm以上、より好ましくは100μm以上である。蛍光体プレート100の厚みの上限は、例えば、1mm以下、好ましくは500μm以下、より好ましくは300μm以下である。
蛍光体プレート100の厚みは、上記の製造工程で得られた後、研削などにより、適当に調整され得る。
また、図2(b)の発光装置120は、基板30と、ボンディングワイヤ60および電極50を介して基板30と電気的に接続された発光素子20と、発光素子20の発光面上に設けられた蛍光体プレート10と、を備える。
図2中、発光素子20と蛍光体プレート10とは、公知の方法で貼り付けられており、例えば、シリコーン系接着剤や熱融着等の方法で貼り合わされてもよい。
また、発光装置110、発光装置120は、全体を透明封止材で封止されていてもよい。
以下の手順に基づいて、α型サイアロン蛍光体A~Cを作製した。
<混合>
グローブボックス内で、原料粉末の配合組成として、窒化ケイ素粉末(宇部興産株式会社製、E10グレード)を62.4質量部、窒化アルミニウム粉末(トクヤマ株式会社製、Eグレード)を22.5質量部、酸化ユーロピウム粉末(信越化学工業社製RUグレード)を2.2質量部、窒化カルシウム粉末(高純度化学研究所社製)を12.9質量部とし、原料粉末をドライブレンド後、目開き250μmのナイロン製篩を通して原料混合粉末を得た。その原料混合粉末120gを、内部の容積が0.4リットルの蓋付きの円筒型窒化ホウ素製容器(デンカ株式会社製、N-1グレード)に充填した。
この原料混合粉末を容器ごとカーボンヒーターの電気炉で大気圧窒素雰囲気中、1800℃で16時間の加熱処理を行った。原料混合粉末に含まれる窒化カルシウムは、空気中で容易に加水分解しやすいので、原料混合粉末を充填した窒化ホウ素製容器はグローブボックスから取り出した後、速やかに電気炉にセットし、直ちに真空排気し、窒化カルシウムの反応を防いだ。合成物は乳鉢で軽く解砕し、目開き150μmの篩を全通させ、蛍光体粉末を得た。
得られた蛍光体粉末を、内部の容積が0.4リットルの蓋付きの円筒型窒化ホウ素製容器に充填し、電気炉で、水素雰囲気中、1450℃で8時間のアニール処理を行った。
次に、50%フッ酸50mlと、70%硝酸50mlとを混合して混合原液とした。混合原液に蒸留水300mlを加え、混合原液の濃度を25%に希釈し、混酸水溶液400mlを調製した。この混酸水溶液に、上述のα型サイアロン蛍光体粒子からなる粉末30gを添加し、混酸水溶液の温度を80℃に保ち、マグネチックスターラを用いて回転速度500rpmで攪拌しながら、60分浸漬する酸処理を実施した。酸処理後の粉末は、蒸留水にて十分に酸を洗い流して濾過し、乾燥させた後、目開き45μmの篩を通して実施例1のα型サイアロン蛍光体粒子からなる粉末を作製した。
実施例1で用いた混酸水溶液を用いて、混酸水溶液の温度を80℃に保ち、マグネチックスターラを用いて回転速度300rpmで攪拌しながら、60分浸漬する酸処理を実施したことを除いて、実施例1と同様な手順で実施例2のα型サイアロン蛍光体粒子からなる粉末を作製した。
<混合>
グローブボックス内で、原料粉末の配合組成として、窒化ケイ素粉末(宇部興産株式会社製、E10グレード)を62.4質量部、窒化アルミニウム粉末(トクヤマ株式会社製、Eグレード)を22.5質量部、酸化ユーロピウム粉末(信越化学工業社製RUグレード)を2.2質量部、窒化カルシウム粉末(高純度化学研究所社製)を12.9質量部とし、原料粉末をドライブレンド後、目開き250μmのナイロン製篩を通して原料混合粉末を得た。その原料混合粉末120gを、内部の容積が0.4リットルの蓋付きの円筒型窒化ホウ素製容器(デンカ株式会社製、N-1グレード)に充填した。
この原料混合粉末を容器ごとカーボンヒーターの電気炉で大気圧窒素雰囲気中、1800℃で16時間の加熱処理を行った。原料混合粉末に含まれる窒化カルシウムは、空気中で容易に加水分解しやすいので、原料混合粉末を充填した窒化ホウ素製容器はグローブボックスから取り出した後、速やかに電気炉にセットし、直ちに真空排気し、窒化カルシウムの反応を防いだ。合成物は乳鉢で軽く解砕し、目開き150μmの篩を全通させ、α型サイアロン蛍光体Cからなる蛍光体粉末を得た。
実施例1の蛍光体プレートの原料として、ガラス粉末、Ca-α型サイアロン蛍光体(得られたα型サイアロン蛍光体A、平均粒径D50:15μm)を用いた。ガラス粉末と、Ca-α型サイアロン蛍光体粉末を所定量比で、メノウ乳鉢により乾式混合した。混合後の原料を目開き75μmのナイロン製メッシュ篩を通して凝集を解き、原料混合粉末を得た。尚、原料の真密度(ガラス粉末:3.70g/cm3、Ca-α型サイアロン蛍光体:3.34g/cm3)から算出した配合比は、ガラス粉末:Ca-α型サイアロン蛍光体=70:30体積%である。
実施例1の蛍光体プレートを研磨してSEM観察を実施した結果、ガラスマトリクス相の間にCa-α型サイアロン蛍光体粒子が分散した状態が観察された。
なお、JIS B0601:1994に準拠し、表面粗さ測定器(ミツトヨ製、SJ-400)を用いて測定した実施例1の蛍光体プレートの主面の表面粗さRaが1.0μmであり、主面とは反対側の裏面の表面粗さRaが1.0μmであった。
Ca-α型サイアロン蛍光体として、得られたα型サイアロン蛍光体Bを使用した以外は、実施例1と同様にして、円板状の蛍光体プレートを得た。
Ca-α型サイアロン蛍光体として、得られたα型サイアロン蛍光体Cを使用した以外は、実施例1と同様にして、円板状の蛍光体プレートを得た。
得られた厚さ1.5mmの円板状の蛍光体プレートの、表1に示す厚みまで薄く加工し、試験用プレートを作製した。
得られた試験用プレートを使用し、発光スペクトルを測定した。その結果、いずれの発光スペクトルにおいて、波長が595nm以上605nm、すなわち橙色光(Orange)の波長領域に、最大の発光強度を示した。
得られた試験用プレートについて、励起光:455nmおよび600nmにおける、反射光(R1、R2)や透過光(T1、T2)を、独立に評価するシステムを有する量子効率測定装置(QE-2100HMB、大塚電子株式会社製)を用いて測定した。結果を表1に示す。
また、得られた試験用プレートについて、[反射光、透過光の強度]と同様にして、量子効率測定装置(QE-2100HMB、大塚電子株式会社製)を用いて、455nmにおける、吸収率、反射率、透過率、外部量子効率、内部量子効率を測定した。結果を表1に示す。
即ち、測定する実施例、比較例の蛍光体プレートを、積分球の開口部に取り付けた。この積分球内に、発光光源(Xeランプ)から455nmの波長に分光した単色光を、光ファイバーを用いて蛍光体の励起光として導入した。この単色光を蛍光体プレートに照射し、蛍光体プレートの蛍光スペクトルを量子効率測定装置を用いて測定した。
得られたスペクトルデータから、励起反射光フォトン数(Qref)及び蛍光フォトン数(Qem)を算出した。励起反射光フォトン数は、励起光フォトン数と同じ波長範囲で、蛍光フォトン数は、480~800nmの範囲で算出した。
また同じ装置を用い、積分球の開口部に反射率が99%の標準反射板(Labsphere社製スペクトラロン(登録商標))を取り付けて、波長455nmの励起光のスペクトルを測定した。その際、435~470nmの波長範囲のスペクトルから励起光フォトン数(Qex)を算出した。
実施例、比較例の各蛍光体の455nm光吸収率、内部量子効率、次に示す計算式によって、求めた。
455nm光吸収率=((Qex-Qref)/Qex)×100
内部量子効率=(Qem/(Qex-Qref))×100
なお、外部量子効率は、以下に示す計算式により求められ、
外部量子効率=(Qem/Qex)×100
従って、上記式より外部量子効率は以下に示す関係となる。
外部量子効率=455nm光吸収率×内部量子効率
20 発光素子
30 基板
40 半田
50 電極
60 ボンディングワイヤ
70 凹部
100 蛍光体プレート
100 発光装置
120 発光装置
130 LEDパッケージ
Claims (10)
- SiO2を含む2種類以上の金属酸化物の焼結物である無機母材と、前記無機母材中に含まれる蛍光体と、を含む板状の複合体を備える蛍光体プレートであって、
前記蛍光体は、α型サイアロン蛍光体を含み、
下記の手順で測定される当該蛍光体プレートの、波長455nmの透過光の強度をT1、波長455nmの反射光の強度をR1としたとき、
T1、R1が、1.5×10-2≦T1/R1≦5.0×10-2を満たす、蛍光体プレート。
(手順)
当該蛍光体プレートにおいて、量子効率測定装置を用いて、波長455nmおよび波長600nmの各波長における、反射光および透過光の強度を測定する。 - 請求項1に記載の蛍光体プレートであって、
上記の手順で測定される当該蛍光体プレートの、波長455nmの透過光の強度をT1、波長600nmの透過光の強度をT2としたとき、
T1、T2が、8.0×10-2≦T1/T2≦2.5×10-1を満たす、蛍光体プレート。 - 請求項1又は2に記載の蛍光体プレートであって、
下記の手順で測定される当該蛍光体プレートの、波長600nmの透過光の強度をT2、波長600nmの反射光の強度をR2としたとき、
T2、R2が、8.5×10-1≦T2/R2≦9.5×10-1を満たす、蛍光体プレート。 - 請求項1~3のいずれか一項に記載の蛍光体プレートであって、
下記の手順で測定される当該蛍光体プレートの、波長455nmの反射光の強度をR1、波長600nmの反射光の強度をR2としたとき、
R1、R2が、5.0≦R1/R2≦6.5を満たす、蛍光体プレート。 - 請求項1~4のいずれか一項に記載の蛍光体プレートであって、
前記α型サイアロン蛍光体の含有量が、前記α型サイアロン蛍光体と前記SiO2を含む2種類以上の金属酸化物との合計体積100Vol%中、体積換算で、5Vol%以上50Vol%以下である、蛍光体プレート。 - 請求項1~5のいずれか一項に記載の蛍光体プレートであって、
前記α型サイアロン蛍光体の平均粒子径D50が、5μm以上30μm以下である、蛍光体プレート。 - 請求項1~6のいずれか一項に記載の蛍光体プレートであって、
当該蛍光体プレートの厚みが、50μm以上300μm以下である、蛍光体プレート。 - 請求項1~7のいずれか一項に記載の蛍光体プレートであって、
照射された青色光を橙色光に変換して発光する波長変換体として用いる、蛍光体プレート。 - 請求項1~8のいずれか一項に記載の蛍光体プレートであって、
455nmの青色光における光線透過率が10%以下である、蛍光体プレート。 - III族窒化物半導体発光素子と、
前記III族窒化物半導体発光素子の一面上に設けられた請求項1~9のいずれか一項に記載の蛍光体プレートと、
を備える、発光装置。
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