WO2021186970A1 - 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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- WO2021186970A1 WO2021186970A1 PCT/JP2021/005179 JP2021005179W WO2021186970A1 WO 2021186970 A1 WO2021186970 A1 WO 2021186970A1 JP 2021005179 W JP2021005179 W JP 2021005179W WO 2021186970 A1 WO2021186970 A1 WO 2021186970A1
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- C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
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- C01B21/0602—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with two or more other elements chosen from metals, silicon or boron
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- C01B21/0632—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with gallium, indium or thallium
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- C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
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- C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7774—Aluminates
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- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
- G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
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- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
- H10H20/822—Materials of the light-emitting regions
- H10H20/824—Materials of the light-emitting regions comprising only Group III-V materials, e.g. GaP
- H10H20/825—Materials of the light-emitting regions comprising only Group III-V materials, e.g. GaP containing nitrogen, e.g. GaN
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- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/851—Wavelength conversion means
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- H—ELECTRICITY
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- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
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- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/851—Wavelength conversion means
- H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
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- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/851—Wavelength conversion means
- H10H20/8514—Wavelength conversion means characterised by their 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 glass, which is a base material (claim 1 of Patent Document 1). According to the same document, the shape of the wavelength conversion member is not limited, and a plate-shaped phosphor plate is also described (paragraph 0054).
- the present inventor has found that by including a relatively transparent spinel in the inorganic base material, excessive scattering of light in the phosphor plate is suppressed, so that the emission intensity in the phosphor plate can be improved. ..
- the present inventor has found that when a phosphor having a Si element is used as the inorganic phosphor, the emission intensity may decrease in the phosphor plate containing spinel. Further diligent research based on these findings revealed that in the X-ray diffraction pattern of the phosphor plate, the ratio of the intensity of a specific peak attributed to spinel to the total intensity of peaks existing within a predetermined 2 ⁇ range was found.
- a phosphor plate comprising a base material and a plate-like complex containing the phosphor contained in the base material.
- the base material contains spinel
- the phosphor contains a phosphor having a Si element and contains.
- the peak intensity corresponding to the spinel whose diffraction angle 2 ⁇ is in the range of 36.0 ° or more and 37.4 ° or less is set to 1.
- a phosphor plate in which the total intensity of peaks having a diffraction angle 2 ⁇ in the range of 32.5 ° or more and 34.5 ° or less satisfies 0.5 or less.
- Group III nitride semiconductor light emitting device and The above-mentioned 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 emission intensity 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, and (b) is a cross-sectional view schematically showing the structure of a wire bonding type light emitting element. It is the schematic of the apparatus for measuring the luminous efficiency of a phosphor plate.
- 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 includes a plate-like composite (plate-like member) containing a base material containing spinel and a phosphor having a Si element present in the base material.
- a phosphor plate containing an ⁇ -type sialon phosphor as a phosphor having a Si element can function as a wavelength converter that converts irradiated blue light into orange light and emits light.
- the phosphor plate is rotated when the peak intensity corresponding to the spinel whose diffraction angle 2 ⁇ is in the range of 36.0 ° or more and 37.4 ° or less is 1.
- the total intensity of the peaks whose angle 2 ⁇ is in the range of 32.5 ° or more and 34.5 ° or less is configured to satisfy 0.5 or less.
- the diffraction pattern of the phosphor plate is measured using an X-ray diffractometer based on the following measurement conditions.
- the phosphor plate to be measured may have a thickness of about 0.18 to 0.22 mm.
- the intensity (I ⁇ ) of the peak attributed to the spinel whose diffraction angle 2 ⁇ is in the range of 36.0 ° or more and 37.4 ° or less is within a predetermined range of 2 ⁇ .
- the optical characteristics of the phosphor plate can be stably evaluated by using the total intensity of the peaks whose diffraction angle 2 ⁇ is in the range of 32.5 ° or more and 34.5 ° or less as I ⁇ 1. It was issued. Furthermore, it was found that the emission intensity of the phosphor plate is improved by setting the upper limit of the index I ⁇ 1 / I ⁇ found in this way to a specific value or less.
- the maximum peak in which the diffraction angle 2 ⁇ is in the range of 36.0 ° or more and 37.4 ° or less is defined as a peak derived from spinel.
- the peak having a diffraction angle 2 ⁇ within the range of 32.5 ° or more and 34.5 ° or less preferably includes a peak attributed to ⁇ -type sialon, and other peaks attributed to ⁇ -type sialon. May be included.
- the range where the diffraction angle 2 ⁇ is 32.5 ° or more and 34.5 ° or less when the peak intensity attributed to the spinel in the range where the diffraction angle 2 ⁇ is 36.0 ° or more and 37.4 ° or less is 1.
- the upper limit of the total intensity I ⁇ 1 of the peaks within is 0.5 or less, preferably 0.3 or less. Thereby, the emission intensity in the phosphor plate can be improved.
- the lower limit of the total intensity I ⁇ 1 is not particularly limited, but when the phosphor having a Si element contains an ⁇ -type sialon phosphor, for example, it is 0.005 or more, preferably 0.01 or more. Thereby, the emission intensity of the phosphor plate can be improved.
- the range where the diffraction angle 2 ⁇ is 60.2 ° or more and 62.0 ° or less when the peak intensity attributed to the spinel in the range where the diffraction angle 2 ⁇ is 36.0 ° or more and 37.4 ° or less is 1.
- the upper limit of the total intensity I ⁇ 2 of the peaks inside may be, for example, 0.2 or less, or 0.1 or less. Thereby, the emission intensity in the phosphor plate can be improved.
- the lower limit of the total intensity I ⁇ 2 is, for example, 0.005 or more, preferably 0.01 or more, and more preferably 0.02 or more. Thereby, the emission intensity in the phosphor plate can be improved.
- the range where the diffraction angle 2 ⁇ is 29.0 ° or more and 31.0 ° or less when the peak intensity attributed to the spinel in the range where the diffraction angle 2 ⁇ is 36.0 ° or more and 37.4 ° or less is 1.
- the lower limit of the total intensity I ⁇ 3 of the peaks inside is, for example, 0.01 or more, preferably 0.03 or more, and more preferably 0.05 or more. Thereby, the emission intensity in the phosphor plate can be improved.
- the upper limit of the total intensity I ⁇ 3 is not particularly limited, but may be, for example, 0.5 or less, or 0.3 or less. As a result, the manufacturing stability of the phosphor plate can be improved.
- the total intensities I ⁇ 1 and I ⁇ 2 are described above.
- I ⁇ 3 can be controlled.
- appropriately adjusting the Mg / Al ratio in the spinel raw material powder can be mentioned as an element for setting the total strengths I ⁇ 1 , I ⁇ 2 , and I ⁇ 3 in a desired numerical range.
- the peak wavelength of the wavelength conversion light emitted from the phosphor plate is preferably 570 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 complex constituting the phosphor plate, the fluorescent substance and the inorganic base material containing spinel are mixed.
- the complex may have a structure in which a phosphor is dispersed in a sintered compound of a compound constituting an inorganic base material. This phosphor may be uniformly dispersed in an inorganic base material containing spinel in a particle state.
- the base material may be the main component in the complex.
- the content of the base material may be, for example, 50 Vol% or more in terms of volume with respect to the complex.
- the base material is composed of an inorganic base material containing spinel.
- This spinel is represented by the general formula M 2x Al 4-4x O 6-4x (where M is at least one of Mg, Mn, and Zn, and 0.2 ⁇ x ⁇ 0.6). May include.
- the sintered body containing spinel represented by the above general formula is relatively transparent. Therefore, excessive scattering of light in the phosphor plate is suppressed. From the viewpoint of transparency, M in the above general formula is preferably Mg.
- the phosphor of the present embodiment includes a phosphor having a Si element.
- a phosphor having a Si element a known one can be used, but for example, an ⁇ -type sialone phosphor may be used. These may be used alone or in combination of two or more.
- the ⁇ -type sialone phosphor may include 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 is orange. A phosphor exhibiting visible light is obtained.
- ⁇ -type sialone has a second crystal phase different from that of ⁇ -type sialon or an amorphous phase that is inevitably present, the solid solution composition cannot be strictly defined by composition analysis or the like.
- the ⁇ -type sialone may contain ⁇ -type sialone, aluminum nitride or its polytypoid, Ca 2 Si 5 N 8 , CaAlSi N 3, and the like as other crystal phases.
- a method for producing an ⁇ -type sialon phosphor there is a method in which a mixed powder containing a compound of silicon nitride, aluminum nitride and an infiltrated solid solution element is heated and reacted in a high temperature nitrogen atmosphere.
- a mixed powder containing a compound of silicon nitride, aluminum nitride and an infiltrated solid solution element is heated and reacted in a high temperature nitrogen atmosphere.
- 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 phosphor is, for example, preferably 1 ⁇ m or more, and more preferably 2 ⁇ m or more. Thereby, the light emission intensity can be increased.
- the upper limit of the average particle size of the phosphor is preferably 30 ⁇ m or less, more preferably 20 ⁇ m or less.
- the average particle size is the dimension of the phosphor in the secondary particles. By setting the average particle size of the phosphor to 5 ⁇ m or more, the transparency of the complex can be further enhanced. On the other hand, by setting the average particle size of the phosphor to 30 ⁇ m or less, it is possible to suppress the occurrence of chipping when the phosphor plate is cut with a dicer or the like.
- the average particle size is the cumulative amount of passage from the small particle size side in the volume-based particle size distribution obtained by measuring by the laser diffraction-scattering particle size distribution measurement method (LS13-320, manufactured by Beckman Coulter). Cumulative passage rate) 50% particle size D50.
- the particle size of the phosphor in the phosphor plate may be considered to be substantially the same as the particle size of the phosphor used as the raw material. This is because the particle size of the raw material phosphor hardly fluctuates due to heating or the like in the plate manufacturing process.
- the lower limit of the content of the 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 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 surface of at least the main surface or both the main surface and the back surface of the phosphor plate may be surface-treated.
- the main surface of the phosphor plate is a surface facing the light emitting surface of the light emitting element. 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 1.5% 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 may include a step (1) of obtaining a mixture containing a metal oxide and a phosphor, and a step (2) of calcining the obtained mixture.
- the metal oxide may be melted and the fluorescent substance particles may be mixed in the obtained melt.
- the powder of the phosphor or metal oxide used as a raw material is preferably as high in purity as possible, and the impurities of elements other than the constituent elements are preferably 0.1% or less.
- a powdered ⁇ -type sialon phosphor is used.
- the metal oxide of the raw material spinel raw material powder is used.
- the metal oxide may be a fine powder, and its average particle size may be, for example, 1 ⁇ m or less.
- Spinel raw material powder may be used as the raw material metal oxide.
- the "spinel raw material powder” is, for example, (i) a powder containing spinel represented by the above-mentioned general formula M 2x Al 4-4x O 6-4x , and / or (ii) general formula MO (M). Is a mixture of a metal oxide powder represented by (at least one of Mg, Mn, and Zn) and a powder of Al 2 O 3.
- the spinel raw material powder may be calcined at, for example, 1300 ° C. or higher and 1650 ° C. or lower.
- the heating temperature in the sintering step is more preferably 1500 ° C. or higher.
- the firing temperature is high, but if the firing temperature is too high, the fluorescence intensity of the phosphor plate decreases, so the above range is preferable.
- the holding time for maintaining this temperature is, for example, 20 minutes or less, preferably 15 minutes or less, and may be 0 minutes. As a result, the emission intensity of the phosphor plate can be increased.
- the firing method may be normal pressure sintering or pressure sintering, but it is more compact than normal pressure sintering in order to suppress deterioration of the characteristics of the phosphor and to obtain a dense composite.
- Pressure sintering that is easy to make is preferable.
- the pressure sintering method examples include hot press sintering, discharge plasma sintering (SPS), and hot isotropic pressure sintering (HIP).
- SPS discharge plasma sintering
- HIP hot isotropic pressure sintering
- 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 ⁇ -sialon.
- the phosphor plate of the present embodiment is obtained.
- the surface of the plate-shaped complex 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.
- 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.
- ⁇ Creation of phosphor plate> (Comparative Example 1) A phosphor plate was manufactured by the following procedure. (1) ⁇ -type sialon phosphor (Aron Bright YL-600B, manufactured by Denka Co., Ltd., median diameter 15 ⁇ m) and spinel raw material powder (MgO: magnesium oxide manufactured by Fujifilm Wako Pure Chemical Industries, Inc., average particle size 0.2 ⁇ m, Purity 99.9% and Al 2 O 3 : AA-03 (manufactured by Sumitomo Chemical Co., Ltd.)) were wet-mixed in an ethanol solvent for 30 minutes using a polyethylene pot and an alumina ball to obtain the obtained product.
- the obtained slurry was suction-filtered to remove the solvent, and then dried. Then, the mixed raw material was disaggregated through a nylon mesh sieve having an opening of 75 ⁇ m to obtain a raw material mixed powder.
- the amount of ⁇ -sialon phosphor was adjusted to be 30% by volume in the phosphor plate (the balance is MgO and Al 2 O 3 ).
- the raw material mixed powder was filled in the hot press jig. Specifically, about 10 g of the raw material mixed powder was filled in a carbon die having an inner diameter of 30 mm in which a carbon lower punch was set. After that, a carbon upper punch was set and the raw material powder was sandwiched. A carbon sheet (GRAFOIL manufactured by GraTech) having a thickness of 0.127 mm was set between the raw material mixed powder and the carbon jig to prevent sticking.
- a hot press jig filled with the raw material mixed powder was set in a multipurpose high-temperature furnace (manufactured by Fuji Dempa Kogyo Co., Ltd., High Multi 5000) equipped 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 1600 ° C. at a rate of 5 ° C. per minute. After reaching 1600 ° C., heating was stopped, the mixture was slowly cooled to room temperature, and the pressure was depressurized.
- the fired product having an outer diameter of 30 mm was collected, and the main surface, the back surface, and the side surface were ground using a surface grinding machine and a cylindrical grinding machine. As a result, a disk-shaped phosphor plate having a diameter of 25 mm was obtained (thickness is shown in the table).
- the obtained phosphor plate was evaluated for the following evaluation items.
- FIG. 3 is a schematic view of an apparatus (LED package 130) for measuring the emission spectrum of the phosphor plate 100.
- an aluminum substrate (substrate 30) on which the recess 70 was formed was prepared.
- the diameter ⁇ of the bottom surface of the recess 70 was 13.5 mm, and the diameter ⁇ of the opening of the recess 70 was 16 mm.
- a blue LED (light emitting element 20) was mounted as a blue light emitting light source inside the recess 70 of the substrate 30.
- a circular phosphor plate 100 is installed above the blue LED so as to close the opening of the recess 70 of the substrate 30, and the device shown in FIG. 3 (chip-on-board type (COB type) LED package 130).
- COB type chip-on-board type
- the emission spectrum on the surface of the phosphor plate 100 when the blue LED of the produced LED package 130 was turned on was measured.
- the maximum value (W / nm) of the emission intensity (fluorescence intensity) of orange light (Orange) having a wavelength of 585 nm or more and 605 nm was determined.
- Table 1 shows the relative values (%) of the other Examples and Comparative Examples when the maximum value of the fluorescence intensity was standardized with Example 1 as 100%. Further, the light transmittance (%) of blue light at a wavelength of 450 nm was determined from the obtained emission spectrum. The results are shown in Table 1.
- 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
本発明者はさらに検討したところ、上記無機蛍光体としてSi元素を有する蛍光体を使用したとき、スピネルを含む蛍光体プレートにおいて発光強度が低下する恐れがあることを見出した。
このような知見に基づきさらに鋭意研究したところ、蛍光体プレートのX線回折パターンにおいて、スピネルに帰属される特定のピークの強度と所定の2θの範囲内に存在するピークの合計強度との比を指標とすることで光学特性を安定的に評価できること、そして、このようなピーク強度比の上限を所定値以下とすることにより、蛍光体プレートの発光強度が改善されることを見出し、本発明を完成するに至った。
母材と、前記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、
前記母材が、スピネルを含み、
前記蛍光体が、Si元素を有する蛍光体を含み、
Cu-Kα線を用いて測定した前記蛍光体プレートのX線回折パターンにおいて、回折角2θが36.0°以上37.4°以下の範囲内にある前記スピネルに対応するピーク強度を1としたとき、
回折角2θが32.5°以上34.5°以下の範囲内にあるピークの合計強度が、0.5以下を満たす、蛍光体プレートが提供される。
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、スピネルを含む母材と、母材中に存在するSi元素を有する蛍光体と、を含む板状の複合体(板状部材)を備える。
蛍光体プレートについて、下記の測定条件に基づいてX線回折装置を用いて回折パターンを測定する。
測定対象の蛍光体プレートは、厚みが約0.18~0.22mmのものを使用してもよい。
(測定条件)
X線源:Cu-Kα線(λ=1.54184Å)、
出力設定:40kV・40mA
測定時光学条件:発散スリット=2/3°
散乱スリット=8mm
受光スリット=開放
回折ピークの位置=2θ(回折角)
測定範囲:2θ=20°~70°
スキャン速度:2度(2θ)/sec,連続スキャン
走査軸:2θ/θ
試料調製:板状の蛍光体プレートをサンプルホルダーに載せる。
ピーク強度はバックグラウンド補正を行って得た値とする。
さらに、そのようにして見出された指標Iβ1/Iαの上限を特定の値以下とすることにより、蛍光体プレートの発光強度が向上することが判明した。
回折角2θが32.5°以上34.5°以下の範囲内に含まれるピークは、α型サイアロンに帰属されるピークが含まれていることが好ましく、その他、β型サイアロンに帰属されるピークが含まれていてもよい。
一方、上記合計強度Iβ1の下限は、とくに限定されないが、Si元素を有する蛍光体がα型サイアロン蛍光体を含む場合、例えば、0.005以上、好ましくは0.01以上である。これにより、蛍光体プレートの発光強度を向上できる。
一方、合計強度Iβ2の下限は、例えば、0.005以上、好ましくは0.01以上、より好ましくは0.02以上である。これにより、蛍光体プレートにおける発光強度を向上できる。
一方、上記合計強度Iβ3の上限は、とくに限定されないが、例えば、0.5以下でもよく、0.3以下でもよい。これにより、蛍光体プレートの製造安定性を高められる。
上記蛍光体プレートを構成する複合体中は、蛍光体とスピネルを含む無機母材とが混在した状態となる。具体的には、複合体は、無機母材を構成する化合物の焼結物中に蛍光体が分散された構造を有してもよい。この蛍光体は、粒子状態で、スピネルを含む無機母材中に均一に分散されていてもよい。
化学量論的には、スピネルはx=0.5(すなわち、一般式MAl2O4)で表される組成である。ただし、原料のMOの量とAl2O3の量の比によっては、スピネルは、MOまたはAl2O3が過剰に固溶した非化学量論組成の化合物となる。
上記一般式で表されるスピネルを含む焼結体は比較的透明である。よって、蛍光体プレート内での光の過剰散乱が抑制される。透明性の観点で、上記一般式におけるMは、Mgであることが好ましい。
本実施形態の蛍光体は、Si元素を有する蛍光体を含む。
Si元素を有する蛍光体としては、公知のものを使用できるが、例えば、α型サイアロン蛍光体を用いてもよい。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。
(M)m(1-x)/p(Eu)mx/2(Si)12-(m+n)(Al)m+n(O)n(N)16-n ・・一般式(1)
蛍光体の平均粒子径を5μm以上とすることにより、複合体の透明性をより高めることができる。一方、蛍光体の平均粒子径を30μm以下とすることにより、ダイサー等で蛍光体プレートを切断加工する際に、チッピングが生じることを抑制することができる。
蛍光体プレート中の蛍光体の粒子径は、原料に使用した蛍光体の粒子径と略同一と考えてよい。プレート製造工程において、加熱などによっては、原料蛍光体の粒子径が変動することは殆どないためである。
表面処理としては、例えば、ダイアモンド砥石等を用いた研削、ラッピング、ポリッシング等の研磨などが挙げられる。
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。
原料の金属酸化物の一例として、スピネル原料粉末を使用する。
金属酸化物は、微粉末であればよく、その平均粒子径は、例えば1μm以下としてもよい。
ここで、「スピネル原料粉末」は、例えば、(i)前述の一般式M2xAl4-4xO6-4xで表されるスピネルを含む粉末、および/または、(ii)一般式MO(MはMg、Mn、Znの少なくともいずれか)で表される金属酸化物の粉末とAl2O3の粉末との混合物である。
また、焼成温度が約1600℃~1650℃の高温領域の場合、この温度を保持する保持時間は、例えば、20分以下、好ましくは15分以下であり、0分としてもよい。これにより、蛍光体プレートの発光強度を高められる。
焼成雰囲気はα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。
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。
III族窒化物半導体発光素子は、例えば、AlGaN、GaN、InAlGaN系材料などのIII族窒化物半導体で構成される、n層、発光層、およびp層を備えるものである。III族窒化物半導体発光素子として、青色光を発光する青色LEDを用いることができる。
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。
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。
(比較例1)
以下手順により蛍光体プレートを製造した。
(1)α型サイアロン蛍光体(アロンブライトYL-600B、デンカ株式会社製、メジアン径15μm)と、スピネル原料粉(MgO:富士フイルム和光純薬社製の酸化マグネシウム、平均粒径0.2μm、純度99.9%、およびAl2O3:AA-03(住友化学社製)、)とを、ポリエチレン製のポットとアルミナ製のボールを用いて、エタノール溶媒中において30分間湿式混合し、得られたスラリーを吸引濾過して溶媒を除去した後、乾燥した。そして、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。
スピネル原料粉がすべて反応してスピネルとなったときに、αサイアロン蛍光体の量が、蛍光体プレート中30体積%となるように調整した(残部は、MgOおよびAl2O3である)。
スピネル原料粉中のMgOとAl2O3の比率は、質量比で、MgO:Al2O3=37:63(モル量において、Mg:Al=3:4)となるようにした。
原料混合粉末とカーボン治具の間には、固着防止のために、厚み0.127mmのカーボンシート(GraTech社製、GRAFOIL)をセットした。
上記(1)中におけるスピネル原料粉末中のMgOとAl2O3の比率を、実施例1が、質量比で、MgO:Al2O3=28:72(モル量において、Mg:Al=1:2)、実施例2が、質量比で、MgO:Al2O3=24:76(モル量において、Mg:Al=9:22)、実施例3が、質量比で、MgO:Al2O3=21:79(モル量において、Mg:Al=1:3)、実施例4が、質量比で、MgO:Al2O3=14:86(モル量において、Mg:Al=3:14)、となるようにした以外、実施例1と同様にして、蛍光体プレートを得た。
各実施例・各比較例の蛍光体プレートについて、X線回折装置(製品名:UltimaIV、リガク社製)を用いて、下記の測定条件で回折パターンを測定した。
(測定条件)
X線源:Cu-Kα線(λ=1.54184Å)、
出力設定:40kV・40mA
測定時光学条件:発散スリット=2/3°
散乱スリット=8mm
受光スリット=開放
回折ピークの位置=2θ(回折角)
測定範囲:2θ=20°~70°
スキャン速度:2度(2θ)/sec,連続スキャン
走査軸:2θ/θ
試料調製:板状の蛍光体プレートをサンプルホルダーに載せた。
ピーク強度はバックグラウンド補正を行って得た値とした。
2θが36.0~37.4°の範囲にある最大ピークが、スピネルに対応することが確認された。
表1には、この最大ピークに対応するピーク強度を1としたときの、各範囲に含まれるピークの合計強度(相対強度)、各範囲に含まれるピークのピーク位置(°)を示す。
蛍光体プレートの発光効率を、チップオンボード型(COB型)のLEDパッケージ130を用いて評価した。図3は、蛍光体プレート100の発光スペクトルを測定するための装置(LEDパッケージ130)の概略図である。
まず、凹部70が形成されたアルミ基板(基板30)を用意した。凹部70の底面の径φは13.5mm、凹部70の開口部の径φは16mmであった。この基板30の凹部70の内部に、青色発光光源として青色LED(発光素子20)を実装した。
その後、基板30の凹部70の開口部を塞ぐように、青色LEDの上部に円形状の蛍光体プレート100を設置し、図3に示す装置(チップオンボード型(COB型)のLEDパッケージ130)を作製した。
得られた発光スペクトルにおいて、波長が585nm以上605nmである橙色光(Orange)の発光強度(蛍光強度)の最大値(W/nm)を求めた。表1には、蛍光強度の最大値について、実施例1を100%として規格化したときの、他の実施例・比較例の相対値(%)を示す。
また、得られた発光スペクトルから、波長450nmにおける青色光の光線透過率(%)を求めた。この結果を表1に示す。
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 (11)
- 母材と、前記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、
前記母材が、スピネルを含み、
前記蛍光体が、Si元素を有する蛍光体を含み、
Cu-Kα線を用いて測定した前記蛍光体プレートのX線回折パターンにおいて、回折角2θが36.0°以上37.4°以下の範囲内にある前記スピネルに対応するピーク強度を1としたとき、
回折角2θが32.5°以上34.5°以下の範囲内にあるピークの合計強度が、0.5以下を満たす、蛍光体プレート。 - 請求項1に記載の蛍光体プレートであって、
前記Si元素を有する蛍光体が、α型サイアロン蛍光体を含む、蛍光体プレート。 - 請求項2に記載の蛍光体プレートであって、
前記Cu-Kα線を用いて測定した前記蛍光体プレートのX線回折パターンにおいて、回折角2θが36.0°以上37.4°以下の範囲内にある前記スピネルに帰属されるピーク強度を1としたとき、
回折角2θが60.2°以上62.0°以下の範囲内にあるピークの合計強度が、0.005以上0.2以下を満たす、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、
前記Cu-Kα線を用いて測定した前記蛍光体プレートのX線回折パターンにおいて、回折角2θが36.0°以上37.4°以下の範囲内にある前記スピネルに帰属されるピーク強度を1としたとき、
回折角2θが29.0°以上31.0°以下の範囲内にあるピークの合計強度が、0.01以上を満たす、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、
前記スピネルが、一般式M2xAl4-4xO6-4x(MはMg、Mn、Znの少なくともいずれかであり、0.2<x<0.6である)で表されるスピネルを含む、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、
前記蛍光体の含有量が、前記複合体中、体積換算で、5Vol%以上50Vol%以下である、蛍光体プレート。 - 請求項1~6のいずれか一項に記載の蛍光体プレートであって、
前記蛍光体の平均粒子径D50が、1μm以上30μm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、
当該蛍光体プレートの厚みが、50μm以上1mm以下である、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、
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1~9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1~10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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| DE112021000924T5 (de) * | 2020-02-07 | 2022-11-17 | Denka Company Limited | Leuchtstoffplatte und lichtemittierende Vorrichtung |
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| JP2015199640A (ja) * | 2014-04-01 | 2015-11-12 | 日本電気硝子株式会社 | 波長変換部材及びそれを用いてなる発光デバイス |
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| US7445730B2 (en) | 2005-03-31 | 2008-11-04 | Dowa Electronics Materials Co., Ltd. | Phosphor and manufacturing method of the same, and light emitting device using the phosphor |
| EP1878778A4 (en) | 2005-03-31 | 2012-04-04 | Mitsubishi Chem Corp | FLUORESCENT, FLUORESCENT FIBER, AND METHOD FOR THE PRODUCTION THEREOF, AND FLUORESCENT RESIN-BASED LUMINESCENCE DEVICE |
| US7443094B2 (en) | 2005-03-31 | 2008-10-28 | Dowa Electronics Materials Co., Ltd. | Phosphor and manufacturing method of the same, and light emitting device using the phosphor |
| JP5154481B2 (ja) | 2009-03-10 | 2013-02-27 | 宇部マテリアルズ株式会社 | 青色発光蛍光体 |
| JP5676653B2 (ja) | 2011-01-18 | 2015-02-25 | シャープ株式会社 | 半導体発光装置 |
| KR101347594B1 (ko) | 2011-10-26 | 2014-01-10 | 선문대학교 산학협력단 | 인광체용 질화규소 세라믹스, 이를 이용한 인광체 및 그 제조방법 |
| US20130193837A1 (en) * | 2012-01-26 | 2013-08-01 | Sharp Kabushiki Kaisha | Phosphor plate, light emitting device and method for manufacturing phosphor plate |
| KR102201048B1 (ko) * | 2014-02-10 | 2021-01-12 | 엘지이노텍 주식회사 | 고 신뢰성 세라믹 형광체 플레이트용 유리 조성물 및 이를 이용한 세라믹 형광체 플레이트 |
| TWI585055B (zh) | 2016-03-29 | 2017-06-01 | 中國製釉股份有限公司 | 玻璃材料、螢光複合材料、與發光裝置 |
| JP6763422B2 (ja) | 2017-11-27 | 2020-09-30 | 日亜化学工業株式会社 | 波長変換部材の製造方法及び波長変換部材 |
| US11387390B2 (en) | 2017-11-27 | 2022-07-12 | Nichia Corporation | Method for producing wavelength converting member, and wavelength converting member |
| JP7268315B2 (ja) * | 2017-12-12 | 2023-05-08 | 日本電気硝子株式会社 | 波長変換部材及びその製造方法、並びに発光装置 |
| US20220350061A1 (en) * | 2019-06-28 | 2022-11-03 | Denka Company Limited | Phosphor plate and light emitting device using the same |
| DE112020005122T5 (de) | 2019-10-23 | 2022-07-21 | Denka Company Limited | Leuchtstoffplatte, lichtemittierende Vorrichtung und Verfahren zur Herstellung einer Leuchtstoffplatte |
| JP6882436B2 (ja) | 2019-12-09 | 2021-06-02 | 株式会社東芝 | ウェアラブル端末、システム及び表示方法 |
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- 2021-02-12 WO PCT/JP2021/005179 patent/WO2021186970A1/ja not_active Ceased
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| WO2013018494A1 (ja) * | 2011-07-29 | 2013-02-07 | シャープ株式会社 | 発光素子、発光装置および発光素子の製造方法 |
| JP2015199640A (ja) * | 2014-04-01 | 2015-11-12 | 日本電気硝子株式会社 | 波長変換部材及びそれを用いてなる発光デバイス |
| WO2019116916A1 (ja) * | 2017-12-12 | 2019-06-20 | 日本電気硝子株式会社 | 波長変換部材及びその製造方法、並びに発光装置 |
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| US12310155B2 (en) | 2025-05-20 |
| KR102826140B1 (ko) | 2025-06-27 |
| TW202142673A (zh) | 2021-11-16 |
| US20230107808A1 (en) | 2023-04-06 |
| CN115151845A (zh) | 2022-10-04 |
| JPWO2021186970A1 (ja) | 2021-09-23 |
| KR20220154673A (ko) | 2022-11-22 |
| JP7538853B2 (ja) | 2024-08-22 |
| DE112021000691T5 (de) | 2022-12-08 |
| CN115151845B (zh) | 2024-04-19 |
| TWI862790B (zh) | 2024-11-21 |
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