WO2012014701A1 - 発光装置 - Google Patents
発光装置 Download PDFInfo
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- WO2012014701A1 WO2012014701A1 PCT/JP2011/066226 JP2011066226W WO2012014701A1 WO 2012014701 A1 WO2012014701 A1 WO 2012014701A1 JP 2011066226 W JP2011066226 W JP 2011066226W WO 2012014701 A1 WO2012014701 A1 WO 2012014701A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
- H01L33/504—Elements with two or more wavelength conversion materials
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- 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
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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
- C09K11/7715—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing cerium
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- 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
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- 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
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73251—Location after the connecting process on different surfaces
- H01L2224/73265—Layer and wire connectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- the present invention relates to a light emitting device having a phosphor.
- LEDs light-emitting diodes
- Semiconductor light-emitting elements such as light-emitting diodes (LEDs) have the advantage of being small in size, low power consumption, and capable of stably emitting high-intensity light.
- the movement which replaces with the lighting fixture using the light-emitting device which consists of LED which emits is progressing.
- Examples of the LED that emits white light include a combination of a blue LED and a Ce-activated YAG phosphor represented by a composition formula of (Y, Gd) 3 (Al, Ga) 5 O 12 : Ce.
- white light is realized by mixing the blue light of the LED and the yellow light emitted from the Ce-activated YAG phosphor of the phosphor.
- the Ce-activated YAG phosphor is excited with high efficiency in the wavelength region of 440 nm to 470 nm where the luminous efficiency of the blue LED is high, the luminous efficiency of the light emitting device is high.
- the Ce-activated YAG phosphor has a narrow emission spectrum half-value width, the red component of the light-emitting device is insufficient, and for example, when used in a home lighting device, the color of human skin looks unnatural. Such inconveniences occur.
- the average color rendering index (Ra) is about 70 in the color temperature range defined by the daylight white color or light bulb color used in the lighting fixture, and in particular, a special color that shows how red appears.
- the color rendering index (R9) is about ⁇ 40, and when used as a lighting fixture, the appearance of red is extremely deteriorated.
- Ra is an index indicating how faithfully the test light reproduces the test color when the color viewed with the reference light is 100.
- R9 is a red special color rendering index.
- a nitride-based red phosphor is further combined so that the emission spectrum of the Ce-activated YAG phosphor can be increased by adding red light.
- a configuration that compensates for the narrow half-value width, improves the uniformity of the emission spectrum of the phosphor, and improves Ra and R9 of white light emitted from the semiconductor light emitting device has been proposed (see, for example, Patent Document 1).
- JP 2003-321675 A (published on November 14, 2003)”
- WO2010 / 110457A1 (published on September 30, 2010)
- Patent Document 1 causes a problem that the light emission efficiency of the light emitting device is extremely low. Specifically, in the configuration described in Patent Document 1, since the red phosphor absorbs yellow light emitted from the yellow phosphor, the light emission efficiency of the light emitting device is significantly reduced.
- the present invention has been made in view of the above-described problems, and an object thereof is to realize a light emitting device that emits white light having excellent color rendering properties with high efficiency.
- the present inventors have realized a phosphor and a light-emitting device using the phosphor and a semiconductor light-emitting element in order to provide a light-emitting device that achieves high color rendering properties and emits light efficiently.
- the prototype was repeated.
- the inventors have found that a light-emitting device that can solve the above-described problems can be provided by the combinations shown below, and have completed the present invention. The detailed contents of the present invention will be described below.
- a light-emitting device is a light-emitting device that emits white light, and a light-emitting element that emits blue light, and an orange phosphor that absorbs the blue light and emits orange light.
- a green phosphor that absorbs the blue light and emits green light, and the orange phosphor has the following formula cCaAlSiN 3.
- a Ce-activated CaAlSiN 3 phosphor made of a solid solution crystal in which Ce and oxygen are dissolved in a crystal having the following composition, wherein the orange phosphor contains 2% by weight or more of Ce.
- the orange phosphor is excited with high efficiency in a wavelength region of 440 nm to 470 nm, which has a wide emission spectrum half width and emits blue light, and generally has high emission efficiency in light emitting elements such as LEDs.
- a light emitting device that emits white light with high Ra and R9 with high luminous efficiency can be realized. Therefore, there is an effect that it is possible to provide a light emitting device that emits white light with excellent color rendering properties with high efficiency.
- the light emitting device is a light emitting device that emits white light, a light emitting element that emits blue light, an orange phosphor that absorbs the blue light and emits orange light, and the blue light.
- At least a green phosphor that emits green light, and the orange phosphor has the following formula cCaAlSiN 3.
- FIG. 6 is a graph showing the XRD measurement results of the phosphor powder obtained in Production Example 1-1.
- 6 is a graph showing an emission spectrum of the phosphor powder obtained in Production Example 1-1.
- 6 is a graph showing an excitation spectrum of the phosphor powder obtained in Production Example 1-1.
- 6 is a graph showing the XRD measurement result of the phosphor powder obtained in Production Example 1-2.
- 6 is a graph showing an emission spectrum of the phosphor powder obtained in Production Example 1-2.
- 6 is a graph showing an excitation spectrum of the phosphor powder obtained in Production Example 1-2.
- 4 is a graph showing an emission spectrum of the phosphor powder obtained in Comparative Production Example 1.
- 6 is a graph showing XRD measurement results of the phosphor powder obtained in Production Example 2.
- 6 is a graph showing an emission spectrum of the phosphor powder obtained in Production Example 2.
- 4 is a graph showing an emission spectrum of the light emitting device manufactured in Example 1.
- 6 is a graph showing an emission spectrum of the light emitting device manufactured in Example 2.
- 6 is a graph showing an emission spectrum of the light emitting device manufactured in Example 3.
- 10 is a graph showing an emission spectrum of the light emitting device manufactured in Example 4.
- 6 is a graph showing an emission spectrum of the light emitting device manufactured in Comparative Example 1.
- 6 is a graph showing an emission spectrum of a light emitting device manufactured in Comparative Example 2.
- FIG. 1 is a cross-sectional view showing a schematic configuration of the light emitting device according to the present embodiment.
- the light emitting device 1 is a light emitting device 1 that emits white light, a semiconductor light emitting element 2 that emits blue light, an orange phosphor 13 that absorbs the blue light and emits orange light, And a green phosphor 14 that absorbs blue light and emits green light.
- the orange phosphor 13 is a Ce activated CaAlSiN 3 phosphor, cCaAlSiN 3.
- blue light means light having an emission spectrum peak at a wavelength of 420 to 480 nm
- green light means light having an emission spectrum peak at a wavelength of 500 to 550 nm
- range light means light having an emission spectrum peak at a wavelength of 570 to 630 nm
- white light means “daylight color”, “daylight white” whose chromaticity point is defined in JIS Z9112. ”,“ White ”,“ warm white ”, and“ bulb color ”.
- the “green phosphor” is a substance that emits the green light when excited by the blue light
- the “orange phosphor” means a substance that emits the orange light
- a semiconductor light emitting element 2 is placed on a printed wiring board 3 as a base, and an orange fluorescent light is placed inside a resin frame 4 that is also placed on the printed wiring board 3.
- the semiconductor light emitting element 2 is sealed by being filled with a mold resin 5 made of a translucent resin in which at least the body 13 and the green phosphor 14 are dispersed.
- the dispersion state of the orange phosphor 13 and the green phosphor 14 is not particularly limited, but the orange phosphor 13 is more dispersed in the vicinity of the semiconductor light emitting element 2 than the green phosphor 14. From the viewpoint of suppressing mutual absorption of the body.
- the semiconductor light emitting device 2 has an InGaN layer 6 as an active layer, and has a p-side electrode 7 and an n-side electrode 8 sandwiching the InGaN layer 6, and the n-side electrode 8 is connected to the printed wiring board 3.
- a p-side electrode 7 and an n-side electrode 8 sandwiching the InGaN layer 6, and the n-side electrode 8 is connected to the printed wiring board 3.
- the p-side electrode 7 of the semiconductor light emitting element 2 is electrically connected to a p-electrode portion 11 provided from the top surface to the back surface of the printed wiring board 3 separately from the n-electrode portion 9 described above via a metal wire 12. ing.
- the semiconductor light emitting element 2 is used as a light emitting element, and the semiconductor light emitting element 2 is a light emitting diode (LED).
- the semiconductor light emitting element 2 is not limited to a light emitting diode (LED), but a semiconductor laser, an inorganic EL (electroluminescence).
- a conventionally known element that emits blue light, such as an element, can be used.
- the LED for example, a commercially available product such as manufactured by Cree can be used.
- the emission peak wavelength of the semiconductor light emitting device 2 is not particularly limited, but is preferably in the range of 440 to 470 nm from the viewpoint of light emission efficiency. Moreover, it is more preferable that it is 455 nm or more and 470 nm or less from a viewpoint of making excitation efficiency of fluorescent substance higher, and also Ra and R9 value of the light which a light-emitting device light-emits higher.
- orange phosphor 13 is a Ce-activated CaAlSiN 3 phosphor, cCaAlSiN 3.
- Ce is contained in a range of 2% by weight or more.
- an oxide of a constituent metal element such as CeO 2 is used as at least one kind of raw material powder. Must be included.
- the orange phosphor 13 is excited with high efficiency in the wavelength region of 440 nm to 470 nm where the half width of the emission spectrum of the orange phosphor 13 is wide and the emission efficiency of the blue LED is high. For this reason, the light-emitting device which emits white light with high Ra and R9 with high luminous efficiency can be realized.
- the orange phosphor 13 has an excitation wavelength exhibiting the maximum value of internal quantum efficiency within a range of 440 nm to 470 nm. According to the above configuration, it is possible to realize a light emitting device that emits white light with higher color rendering properties with higher luminous efficiency.
- the light-emitting device 1 according to the present embodiment when used for a lighting fixture or the like, it is necessary to flow a large current compared to the case where the light-emitting device 1 is used for an indicator or the like. Also reach.
- the YAG: Ce phosphor exemplified in Japanese Patent Application Laid-Open No. 2003-321675 has a light emission intensity reduced to 50% of room temperature in a high temperature environment at an ambient temperature of 150 ° C. as disclosed in Japanese Patent Application Laid-Open No. 2008-127529. Resulting in.
- the oxynitride phosphors exemplified in the present specification have excellent light emission characteristics particularly in a high temperature environment.
- non-patent literature Science and Technology of Advanced Materials 8). (2007) 588-600
- the light emission intensity of about 85% to 90% of room temperature can be maintained even in a high temperature environment of ambient temperature of 100 ° C. to 150 ° C.
- the phosphor included in the light emitting device 1 according to the present embodiment also has light emission characteristics in a high temperature environment equivalent to the phosphor exemplified in the non-patent document.
- Ce and oxygen The concentration of Ce in the orange phosphor 13 in which is dissolved is preferably 6% by weight or less.
- the Li concentration in the orange phosphor 13 is preferably 4% by weight or less from the viewpoint of luminous efficiency.
- the Li concentration in the orange phosphor 13 is preferably 1.5% by weight or more from the viewpoint of widening the half-value width of the emission spectrum.
- the half width of the emission spectrum of the orange phosphor 13 is preferably 120 nm or more.
- the said half value width is 150 nm or less.
- the particle size of the orange phosphor 13 is preferably 1 ⁇ m to 50 ⁇ m, and more preferably 5 ⁇ m to 20 ⁇ m. Further, the shape of the particles is preferably single particles rather than aggregates, and specifically, the specific surface area is 1 m 2 / g or less, more preferably 0.4 m 2 / g or less. preferable. For such particle size adjustment and particle shape adjustment, techniques such as mechanical pulverization, grain boundary phase removal by acid treatment, annealing treatment, and the like can be used as appropriate.
- Patent Document 2 Japanese Patent Laid-Open No. 2008-530334
- FIG. 2 of Patent Document 2 shows Ce activated CaAlSiN.
- the excitation spectrum of three phosphors is illustrated.
- the configuration according to the present invention is different from the invention described in Patent Document 2.
- Ce-activated CaAlSiN 3 phosphor disclosed in Patent Document 2 as compared with Ce-activated CaAlSiN 3 phosphor according to the present embodiment, the long wavelength side and the peak wavelength 615nm in the spectrum of the light emitting It is in. For this reason, in the case where the light-emitting device is configured using the Ce-activated CaAlSiN 3 phosphor described in Patent Document 2, a part of the emitted light deviates from human visibility, and the light-emitting efficiency of the light-emitting device is significantly reduced. .
- the orange fluorescent substance 13 which has a suitable light emission characteristic and absorption characteristic at the time of combining with blue LED is provided.
- the light emitting device 1 includes a green phosphor 14 in addition to the orange phosphor 13 as a phosphor.
- the half-width of the emission spectrum of the green phosphor 14 is preferably narrower than the half-width of the emission spectrum of the orange phosphor 13.
- the green phosphor 14 preferably has a half-value width of an emission spectrum of 70 nm or less, and more preferably 55 nm or less.
- the lower limit of the half-value width of the emission spectrum of the green phosphor 14 is not particularly limited, but is preferably 15 nm or more, and more preferably 40 nm or more.
- the green phosphor 14 When the half width of the emission spectrum of the green phosphor 14 is within the above range, the green phosphor is suppressed from being absorbed by the orange phosphor 13, and a light emitting device with higher luminous efficiency can be realized.
- the green phosphor 14 is not particularly limited as long as the above requirements are satisfied.
- an Eu-activated oxynitride phosphor is preferably used because it has high stability and excellent temperature characteristics.
- the Eu-activated BSON phosphor disclosed in JP-A-2008-138156 and the Eu-activated ⁇ sialon disclosed in JP-A-2005-255895 are excellent in luminous efficiency.
- a phosphor is preferably used.
- the Eu-activated ⁇ sialon phosphor is particularly excellent in stability and temperature characteristics, and has a particularly narrow emission spectrum with a particularly narrow half-value width.
- Ba y 'Eu x' Si u 'O v' N w ' (However, 0 ⁇ y ′ ⁇ 3, 1.6 ⁇ y ′ + x ′ ⁇ 3, 5 ⁇ u ′ ⁇ 7, 9 ⁇ v ′ ⁇ 15, 0 ⁇ w ′ ⁇ 4)
- a phosphor having the following composition is preferable, and more preferable ranges of y ′, x ′, u ′, v ′, and w ′ are 1.5 ⁇ y ′ ⁇ 3, 2 ⁇ y ′ + x ′ ⁇ 3, and 5. 5 ⁇ u ′ ⁇ 7, 10 ⁇ v ′ ⁇ 13, 1.5 ⁇ w ′ ⁇ 4.
- Eu-activated ⁇ sialon phosphor specifically, Si 6-z ' Al z' O z ' N 8-z' (However, 0 ⁇ z ′ ⁇ 4.2)
- a phosphor in which Eu is activated is preferable, and a more preferable range of z ′ is 0 ⁇ z ′ ⁇ 0.5.
- the Eu-activated ⁇ sialon phosphor preferably has an oxygen concentration in the range of 0.1 to 0.6% by weight, and more preferably has an Al concentration of 0.13 to 0.8% by weight. If the oxygen concentration and Al concentration of the Eu-activated ⁇ sialon phosphor are within these ranges, the half width of the emission spectrum tends to be narrower.
- the Eu-activated ⁇ sialon phosphor disclosed in International Publication No. WO2008 / 062781 has high emission efficiency due to less unnecessary absorption because the damaged phase of the phosphor is removed by post-treatment such as acid treatment after firing. . Furthermore, the Eu-activated ⁇ sialon phosphor exemplified in Japanese Patent Application Laid-Open No. 2008-303331 is preferable because the oxygen concentration is 0.1 to 0.6% by weight, and the half-value width of the emission spectrum becomes narrower.
- the green phosphor 14 as described above has a light absorption rate of 10 at 600 nm, which is a wavelength region that does not contribute to the light emission of the ⁇ sialon phosphor at all and is near the peak wavelength of the orange phosphor. % Or less can be suitably used.
- the particle size of the green phosphor 14 is preferably 1 ⁇ m to 50 ⁇ m, and more preferably 5 ⁇ m to 20 ⁇ m.
- the shape of the particles is preferably a single particle rather than an aggregated state.
- the specific surface area is 1 m 2 / g or less, more preferably 0.4 m 2 / g or less. preferable.
- techniques such as mechanical pulverization, grain boundary phase removal by acid treatment, annealing treatment, and the like can be used as appropriate.
- both the orange phosphor 13 and the green phosphor 14 are nitride-based, so that two types of phosphors are used. Temperature dependence, specific gravity, particle size, etc. are close to each other. For this reason, when the light emitting device 1 as described above is formed, the light emitting device 1 can be manufactured with high yield and is not easily influenced by the surrounding environment, and thus a highly reliable light emitting device is obtained.
- the nitride-based phosphor has a strong covalent bond of the host crystal, it is particularly less temperature dependent and is resistant to chemical and physical damage.
- the mold resin 5 used for sealing the semiconductor light emitting element 2 is obtained by dispersing the orange phosphor 13 in a translucent resin such as silicone resin or epoxy resin. is there.
- the dispersion method is not particularly limited, and a conventionally known method can be employed.
- the mixing ratio of the phosphors to be dispersed is not particularly limited, and can be appropriately determined so as to emit white light in the daylight white region and the light bulb color region.
- the weight ratio of the translucent resin to the orange phosphor 13 (the weight of the translucent resin / the weight of the orange phosphor 13) can be in the range of 2 to 20.
- the weight ratio of the green phosphor 14 to the orange phosphor 13 (the weight of the green phosphor 14 / the weight of the orange phosphor 13) can be in the range of 0.01 to 2. That is, it can be in the range of 1 to 200 in terms of (weight of translucent resin / weight of green phosphor 14).
- Can adopt the same configuration as that of the prior art for example, Japanese Patent Laid-Open No. 2003-321675, Japanese Patent Laid-Open No. 2006-8721, etc.), and can be manufactured by the same method as the prior art.
- a semiconductor light-emitting device that emits white light comprising at least a semiconductor light-emitting element that emits blue light and an orange phosphor that absorbs the blue light and emits orange light, and the orange phosphor is Ce-activated.
- the present invention includes the following inventions.
- a light-emitting device is a light-emitting device that emits white light, and a light-emitting element that emits blue light, and an orange phosphor that absorbs the blue light and emits orange light.
- a green phosphor that absorbs the blue light and emits green light, and the orange phosphor has the following formula cCaAlSiN 3.
- a Ce-activated CaAlSiN 3 phosphor made of a solid solution crystal in which Ce and oxygen are dissolved in a crystal having the following composition, wherein the orange phosphor contains 2% by weight or more of Ce.
- the orange phosphor is excited with high efficiency in a wavelength region of 440 nm to 470 nm, which has a wide emission spectrum half width and emits blue light, and generally has high emission efficiency in light emitting elements such as LEDs.
- a light emitting device that emits white light with high Ra and R9 with high luminous efficiency can be realized. Therefore, there is an effect that it is possible to provide a light emitting device that emits white light with excellent color rendering properties with high efficiency.
- the orange phosphor has an excitation wavelength exhibiting the maximum value of the internal quantum efficiency within a range of 440 nm to 470 nm.
- the orange phosphor is excited with high efficiency in a wavelength region where light emission elements such as LEDs that emit blue light have high emission efficiency.
- a light emitting device that emits light can be realized.
- the orange phosphor preferably contains 4% by weight or less of Li.
- the orange phosphor preferably contains 6% by weight or less of Ce.
- the orange phosphor preferably has a half-value width of an emission spectrum of 120 nm or more and 150 nm or less.
- the half width of the orange phosphor is widened, it is possible to realize a light emitting device that emits light having high color rendering properties and has high luminous efficiency.
- the green phosphor preferably has a half-value width of an emission spectrum of 55 nm or less.
- the green phosphor is preferably an Eu-activated oxynitride phosphor.
- the Eu-activated oxynitride phosphor since the Eu-activated oxynitride phosphor has high stability and excellent temperature characteristics, a light emitting device having excellent temperature characteristics can be realized.
- the green phosphor is preferably an Eu activated ⁇ sialon phosphor.
- the Eu-activated ⁇ sialon phosphor is efficiently excited by blue light and emits light with a particularly narrow half-value width of the emission spectrum when excited by blue light.
- the light absorption rate at 600 nm of the Eu-activated ⁇ sialon phosphor is 10% or less.
- excitation spectrum and emission spectrum The excitation spectrum and emission spectrum of the phosphor were measured by F-4500 (product name, manufactured by Hitachi, Ltd.). The excitation spectrum was measured by scanning the intensity of the emission peak. Each emission spectrum was measured by excitation with light having a wavelength of 450 nm.
- the internal quantum efficiency of the phosphor powder was measured using a measurement system that combines a spectrophotometer (product name: MCPD-7000, manufactured by Otsuka Electronics Co., Ltd.) and an integrating sphere.
- Li concentration and Ce concentration of phosphor powder The Li concentration and Ce concentration of the phosphor powder were measured by ICP (product name: IRIS Advantage, manufactured by Nippon Jarrell-Ash).
- Powder X-ray diffraction measurement was measured using Cu K ⁇ rays.
- powder weighing and mixing steps were all performed in a glove box capable of maintaining a nitrogen atmosphere having a moisture content of 1 ppm or less and an oxygen content of 1 ppm or less.
- the boron nitride crucible containing the mixed powder was set in a graphite resistance heating type electric furnace.
- the firing atmosphere is evacuated with a diffusion pump, and the temperature is raised from room temperature to 800 ° C. at a rate of 1200 ° C. per hour.
- nitrogen having a purity of 99.999% by volume is introduced to increase the pressure.
- the temperature was set to 0.92 MPa, and the temperature was raised to 600 ° C. per hour up to a firing temperature of 1800 ° C., and kept at the firing temperature of 1800 ° C. for 2 hours.
- the phosphor powder is a solid solution crystal in which Ce and oxygen are in solid solution because the raw material powder contains an oxide raw material.
- Table 2 shows the Ce concentration and Li concentration of the phosphor powder obtained by ICP, and the composition of each phosphor determined from the Li concentration.
- the Li concentration by ICP measurement is a value lower than 4.09% by weight of the theoretical composition, and this is considered to be the effect of volatilization of Li during firing and washing with water after firing.
- the phosphor powder When the obtained phosphor powder was subjected to powder X-ray diffraction measurement (XRD), the XRD chart shown in FIG. 2 was obtained, and the phosphor powder may have a crystal structure having a CaAlSiN 3 phase as a main phase. confirmed. Moreover, as a result of irradiating the phosphor powder with a lamp that emits light having a wavelength of 365 nm, it was confirmed that the phosphor powder emits orange light.
- FIG. 3 is a graph showing an emission spectrum of the obtained phosphor powder, where the vertical axis represents the emission intensity (arbitrary unit) and the horizontal axis represents the wavelength (nm).
- FIG. 4 is a graph showing the excitation spectrum of the obtained phosphor powder, where the vertical axis represents excitation intensity (arbitrary unit) and the horizontal axis represents wavelength (nm).
- Table 3 shows the chromaticity coordinates, peak wavelength and half-value width of the emission spectrum shown in FIG. 3, and the excitation wavelength (maximum value of the internal quantum efficiency) indicating the maximum value of the internal quantum efficiency in the phosphor powder.
- the charged weight ratio of Ce is 4.6% by weight
- the phosphor powder is a solid solution crystal in which Ce and oxygen are in solid solution because the raw material powder contains an oxide raw material.
- Table 2 shows the Ce concentration and Li concentration of the phosphor powder obtained by ICP, and the composition of each phosphor determined from the Li concentration.
- Li concentration by ICP measurement is a value lower than 4.06% by weight of the theoretical composition, this is considered to be an effect of volatilization of Li during firing and washing with water after firing.
- the phosphor powder When the obtained phosphor powder was subjected to powder X-ray diffraction measurement (XRD), the XRD chart shown in FIG. 5 was obtained, and the phosphor powder may have a crystal structure having a CaAlSiN 3 phase as a main phase. confirmed. Moreover, as a result of irradiating the phosphor powder with a lamp that emits light having a wavelength of 365 nm, it was confirmed that the phosphor powder emits orange light.
- XRD chart shown in FIG. 5 was obtained, and the phosphor powder may have a crystal structure having a CaAlSiN 3 phase as a main phase. confirmed. Moreover, as a result of irradiating the phosphor powder with a lamp that emits light having a wavelength of 365 nm, it was confirmed that the phosphor powder emits orange light.
- FIG. 6 shows a graph showing the emission spectrum of the obtained phosphor powder.
- the vertical axis in the graph is the emission intensity (arbitrary unit), and the horizontal axis is the wavelength (nm).
- Table 3 shows the chromaticity coordinates, peak wavelength, and half-value width of the emission spectrum shown in FIG. 6, and the excitation wavelength (maximum value of internal quantum efficiency) indicating the maximum value of internal quantum efficiency in the phosphor powder.
- FIG. 1 a graph showing the excitation spectrum of the obtained phosphor powder is shown in FIG.
- the vertical axis represents excitation intensity (arbitrary unit), and the horizontal axis represents wavelength (nm).
- Table 2 shows the Ce concentration and Li concentration of the phosphor powder obtained by ICP, and the composition of each phosphor determined from the Li concentration.
- the Li concentration by ICP measurement is a value lower than 4.17% by weight of the theoretical composition, but this is considered to be an effect of volatilization of Li during firing and washing with water after firing.
- the obtained phosphor powder was subjected to powder X-ray diffraction measurement (XRD), it was confirmed that the phosphor powder had a crystal structure having a CaAlSiN 3 phase as a main phase. Moreover, as a result of irradiating the phosphor powder with a lamp that emits light having a wavelength of 365 nm, it was confirmed that the phosphor powder emits orange light.
- XRD powder X-ray diffraction measurement
- FIG. 8 shows a graph showing the emission spectrum of the obtained phosphor powder.
- the vertical axis in the graph is the emission intensity (arbitrary unit), and the horizontal axis is the wavelength (nm).
- Table 3 shows the chromaticity coordinates, peak wavelength, and half-value width of the emission spectrum shown in FIG. 8, and the excitation wavelength (maximum value of internal quantum efficiency) indicating the maximum value of internal quantum efficiency in the phosphor powder.
- FIG. 1 a graph showing the excitation spectrum of the obtained phosphor powder is shown in FIG.
- the vertical axis represents excitation intensity (arbitrary unit), and the horizontal axis represents wavelength (nm).
- FIG. 10 is a graph showing the excitation wavelength dependence of the internal quantum efficiency in each phosphor powder produced in Production Examples 1-1 and 1-2 and Comparative Production Example 1.
- the phosphor powders shown in Production Examples 1-1 and 1-2 have a particularly high internal quantum efficiency in the wavelength region of 440 nm to 470 nm where the luminous efficiency of the blue LED is high. It turns out that it is suitable as a fluorescent substance for excitation. This is because the phosphor powder shown in the production example is a Ce activated CaAlSiN 3 phosphor, cCaAlSiN 3.
- Each phosphor powder is an orange phosphor composed of a solid solution crystal in which Ce and oxygen are in solid solution because the raw material powder contains an oxide raw material.
- FIG. 11 shows a graph showing the Li concentration dependency of the emission intensity for the various orange phosphors obtained.
- the Li concentration in the orange phosphor is 4% by weight or less, the emission intensity tends to increase.
- the Ce concentration and the Li concentration in the solid solution crystal are out of the above ranges, the decrease in the emission intensity is considered to be due to the fact that the concentration of the element contributing to the emission is too low or the generation of a heterogeneous phase. It is done.
- FIGS. 12 and 13 graphs showing the ambient temperature dependence of the emission intensity when excited with light having a wavelength of 450 nm for the various orange phosphors obtained are shown in FIGS.
- the light emission intensity in the high temperature environment does not decrease even when the Li concentration in the orange phosphor increases, but the light emission intensity in the high temperature environment tends to decrease as the Ce concentration increases.
- the Ce concentration in the orange phosphor is preferably 6% by weight or less.
- the Li concentration is not particularly limited from the viewpoint of light emission intensity in a high temperature environment.
- FIG. 14 shows the Li concentration dependence of the half-value width of the emission spectrum when the various orange phosphors are excited with light having a wavelength of 450 nm. As shown in FIG. 14, it can be seen that when the Li concentration is 1.5% by weight or more, the full width at half maximum of the emission spectrum tends to increase.
- the emission intensity described in this production example was measured using an apparatus combining MCPD-7000 (manufactured by Otsuka Electronics) and an integrating sphere.
- the crucible is set in a graphite resistance heating type pressure electric furnace, the firing atmosphere is evacuated by a diffusion pump, heated from room temperature to 800 ° C. at a rate of 500 ° C. per hour, and the purity is 99.800 at 800 ° C.
- the temperature was raised to 1900 ° C. at 500 ° C. per hour and further maintained at that temperature for 8 hours to obtain a calcined powder sample.
- the obtained calcined powder sample was pulverized in an agate mortar, again dropped naturally into a boron nitride crucible, and the crucible was treated in an atmospheric pressure argon atmosphere at 1450 ° C. for 8 hours to obtain a phosphor sample.
- the obtained phosphor sample was pulverized with an agate mortar and further treated in a 1: 1 mixed acid of 50% hydrofluoric acid and 70% nitric acid to obtain a phosphor powder.
- the emission spectrum shown in FIG. 16 was obtained.
- the vertical axis represents emission intensity (arbitrary unit), and the horizontal axis represents wavelength (nm).
- Examples 1 to 4 The orange phosphor and the green phosphor shown in Table 4 are mixed with silicone resin (trade name: KER2500, manufactured by Shin-Etsu Silicone Co., Ltd.) at the weight ratio shown in Table 5, respectively, to disperse the orange phosphor and the green phosphor, respectively.
- silicone resin trade name: KER2500, manufactured by Shin-Etsu Silicone Co., Ltd.
- Each mold resin was prepared.
- each of the semiconductors of Examples 1 to 4 having the structure shown in FIG. 1 is filled in the resin frame in the order of the mold resin in which the orange phosphor is dispersed and the mold resin in which the green phosphor is dispersed.
- a light emitting device was manufactured.
- LED (trade name: EZR, manufactured by Cree) having an emission peak wavelength shown in Table 4 was used as the semiconductor light emitting element.
- 17 to 20 show emission spectra of the semiconductor light emitting devices manufactured in Examples 1 to 4, and Table 6 shows various characteristics of each semiconductor light emitting device. 17 to 20, the vertical axis represents emission intensity (arbitrary unit), and the horizontal axis represents wavelength (nm).
- TCP represents correlated color temperature (unit: K)
- Duv represents deviation
- u ′ and v ′ represent chromaticity coordinates.
- the light emitting device emits white light when blue light is irradiated from a light emitting element that emits blue light to an orange phosphor and a green phosphor.
- a light emitting element that emits blue light to an orange phosphor and a green phosphor.
- blue light having an emission spectrum peak at the wavelength shown in Table 4
- white light having the emission spectrum shown in FIGS. 17 to 20, respectively. Issued.
- LED (trade name: EZR, manufactured by Cree) having an emission peak wavelength shown in Table 4 was used as the semiconductor light emitting element.
- 21 and 22 show emission spectra of the semiconductor light emitting devices manufactured in Comparative Examples 1 and 2, and Table 6 shows various characteristics of each semiconductor light emitting device. 21 and 22, the vertical axis represents the emission intensity (arbitrary unit), and the horizontal axis represents the wavelength (nm).
- the emission spectra of the semiconductor light emitting devices shown in FIGS. 17 to 22 were measured with a spectrophotometer (product name: MCPD-7000, manufactured by Otsuka Electronics Co., Ltd.), and the indices shown in Table 6 are the measured emission spectra. Calculated based on.
- the luminous efficiency (luminous intensity) of the semiconductor light emitting device was measured using a measuring system that combined a spectrophotometer (product name: MCPD-7000, manufactured by Otsuka Electronics Co., Ltd.) and an integrating sphere.
- the light emitting device of Example 2 having an LED peak wavelength of 460 nm is light emitting of Example 1 having an LED peak wavelength of 450 nm. It can be seen that the color rendering property is higher than that of the apparatus. Since the orange phosphor used in this example has a maximum value of internal quantum efficiency in the range of 440 nm to 470 nm, it has an advantage from the viewpoint of achieving both high color rendering properties and luminous efficiency.
- the light emitting device of the present invention has high luminous efficiency and emits white light showing high Ra and R9. For this reason, it can be used suitably for various lighting fixtures such as household lighting, medical lighting, and vehicular lamps.
Abstract
Description
cCaAlSiN3・(1-c)LiSi2N3
(但し、0.2≦c≦0.8)
の組成を有する結晶に、Ceと酸素とが固溶した固溶体結晶からなるCe賦活CaAlSiN3蛍光体であり、上記橙色蛍光体は、Ceを2重量%以上含有していることを特徴とする。
cCaAlSiN3・(1-c)LiSi2N3
(但し、0.2≦c≦0.8)
の組成を有する結晶に、Ceと酸素とが固溶した固溶体結晶からなるCe賦活CaAlSiN3蛍光体であり、上記橙色蛍光体は、Ceを2重量%以上含有していることを特徴としている。
cCaAlSiN3・(1-c)LiSi2N3
(但し、0.2≦c≦0.8)
の組成を有する結晶に、Ceと酸素とが固溶した固溶体結晶であり、Ceを2重量%以上の範囲で含有している。
本実施の形態では、発光素子として半導体発光素子2を用いており、半導体発光素子2は発光ダイオード(LED)である。しかしながら、上記半導体発光素子2としては発光ダイオード(LED)に限定されず、半導体レーザ、無機EL(electroluminescence)
素子等の青色光を発する従来公知の素子を使用することができる。尚、LEDは、例えば、Cree社製等の市販品を用いることができる。
上記橙色蛍光体13は、Ce賦活CaAlSiN3蛍光体であり、
cCaAlSiN3・(1-c)LiSi2N3
(但し、0.2≦c≦0.8)
の組成を有する結晶に、Ceと酸素とが固溶した固溶体結晶であり、Ceを2重量%以上の範囲で含有している。
本実施の形態に係る発光装置1では、蛍光体として上記橙色蛍光体13に加えて、緑色蛍光体14を備えている。
Bay'Eux'Siu'Ov'Nw'
(但し、0≦y’≦3、1.6≦y’+x’≦3、5≦u’≦7、9<v’<15、0<w’≦4)
の組成を有する蛍光体が好ましく、上記y’、x’、u’、v’、w’の更に好ましい範囲は、1.5≦y’≦3、2≦y’+x’≦3、5.5≦u’≦7、10<v’<13、1.5<w’≦4である。
Si6-z'Alz'Oz'N8-z'
(但し、0<z’<4.2)
の組成を有するものに、Euが賦活された蛍光体が好ましく、上記z’の更に好ましい範囲は、0<z’<0.5である。
上記発光装置1において、半導体発光素子2の封止に用いるモールド樹脂5は、例えば、シリコーン樹脂、エポキシ樹脂等の透光性樹脂に上記橙色蛍光体13を分散させたものである。当該分散方法としては、特には限定されず、従来公知の方法を採用することができる。
本実施の形態に係る発光装置1において、半導体発光素子2、橙色蛍光体13、緑色蛍光体14及びモールド樹脂5以外の、プリント配線基板3や接着剤10、金属ワイヤ12等については、従来技術(例えば、特開2003-321675号公報、特開2006-8721号公報等)と同様の構成を採用することができ、従来技術と同様の方法により製造することができる。
(1)白色光を発する半導体発光装置であって、青色光を発する半導体発光素子と、当該青色光を吸収して橙色光を発する橙色蛍光体とを少なくとも備え、上記橙色蛍光体は、Ce賦活CaAlSiN3蛍光体であり、
cCaAlSiN3・(1-c)LiSi2N3
(但し、0.2≦c≦0.8)
の組成を有する結晶に、Ceと酸素とが固溶した固溶体結晶であり、Ceを2重量%以上の範囲で含有していることを特徴とする半導体発光装置。
cCaAlSiN3・(1-c)LiSi2N3
(但し、0.2≦c≦0.8)
の組成を有する結晶に、Ceと酸素とが固溶した固溶体結晶からなるCe賦活CaAlSiN3蛍光体であり、上記橙色蛍光体は、Ceを2重量%以上含有していることを特徴とする。
蛍光体の励起スペクトル及び発光スペクトルは、F-4500(製品名、日立製作所製)によって測定した。励起スペクトルは、発光ピークの強度をスキャンして測定した。また、各発光スペクトルは、波長450nmの光で励起して測定した。
蛍光体粉末の内部量子効率は、分光光度計(製品名:MCPD-7000、大塚電子製)と積分球を組み合わせた測定系を用いて測定した。
蛍光体粉末のLi濃度及びCe濃度は、ICP(製品名:IRIS Advantage、日本ジャーレル・アッシュ社製)により測定した。
粉末X線回折測定(XRD)は、CuのKα線を用いて測定した。
(製造例1-1:橙色蛍光体の作製1)
0.3CaAlSiN3・0.7LiSi2N3組成の結晶を母体結晶として、これにCeを賦活した蛍光体を得ることを目的として合成を行った。
0.3CaAlSiN3・0.7LiSi2N3組成の結晶を母体結晶として、これにCeを賦活した蛍光体を得ることを目的として合成を行った。
0.3CaAlSiN3・0.7LiSi2N3組成の結晶を母体結晶として、これにCeを賦活した蛍光体を得ることを目的として合成を行った。
cCaAlSiN3・(1-c)LiSi2N3
(但し、0.2≦c≦0.8)
の組成を有する結晶に、Ceと酸素とが固溶した固溶体結晶であり、Ceを2重量%以上の範囲で含有していることに起因する。
Si3N4、AlN、Li3N、Ca3N2、CeO2の混合比率を表1に示す値に変更したこと以外は製造例1-1と同様の操作を行い、Ce濃度及びLi濃度を変化させた、Ceと酸素とが固溶した各種固溶体結晶を合成した。ICPによって得られたCe濃度及びLi濃度、並びに当該Li濃度から求めた各蛍光体の組成を表2に示す。
Si6-z'Alz'Oz'N8-z'で表される組成式において、z’=0.23のものにEuが0.09at.%賦活されたEu賦活βサイアロン蛍光体を得るべく、α型窒化ケイ素粉末95.82重量%、窒化アルミニウム粉末3.37重量%及び酸化ユーロピウム粉末0.81重量%の組成となるように秤量し、窒化ケイ素焼結体製の乳鉢と乳棒とを用い、10分以上混合し粉体凝集体を得た。この粉体凝集体を直径20mm、高さ20mmの大きさの窒化ホウ素製のるつぼに自然落下させて入れた。
<実施例1~4>
表4に示す橙色蛍光体及び緑色蛍光体を、表5に示す重量比率でそれぞれシリコーン樹脂(商品名:KER2500、信越シリコーン社製)と混合して、橙色蛍光体及び緑色蛍光体をそれぞれ分散させた各モールド樹脂を作製した。次に、橙色蛍光体が分散したモールド樹脂、緑色蛍光体が分散したモールド樹脂の順に樹脂枠内に各モールド樹脂を充填し、図1に示した構造を有する、実施例1~4の各半導体発光装置を作製した。
表4に示す橙色蛍光体及び緑色蛍光体を、表5に示す重量比率でそれぞれシリコーン樹脂(商品名:KER2500、信越シリコーン社製)と混合して、橙色蛍光体及び緑色蛍光体をそれぞれ分散させた各モールド樹脂を作製した。次に、橙色蛍光体が分散したモールド樹脂、緑色蛍光体が分散したモールド樹脂の順に樹脂枠内に各モールド樹脂を充填し、図1に示した構造を有する、比較例1、2の各半導体発光装置を作製した。
2 半導体発光素子(発光素子)
3 プリント配線基板
4 樹脂枠
5 モールド樹脂
6 InGaN層
7 p側電極
8 n側電極
9 n電極部
10 接着剤
11 p電極部
12 金属ワイヤ
13 橙色蛍光体
14 緑色蛍光体
Claims (9)
- 白色光を発する発光装置であって、青色光を発する発光素子と、当該青色光を吸収して橙色光を発する橙色蛍光体と、当該青色光を吸収して緑色光を発する緑色蛍光体とを少なくとも備え、
上記橙色蛍光体は、下記式
cCaAlSiN3・(1-c)LiSi2N3
(但し、0.2≦c≦0.8)
の組成を有する結晶に、Ceと酸素とが固溶した固溶体結晶からなるCe賦活CaAlSiN3蛍光体であり、
上記橙色蛍光体は、Ceを2重量%以上含有していることを特徴とする発光装置。 - 上記橙色蛍光体は、内部量子効率の最大値を示す励起波長が440nm~470nmの範囲内であることを特徴とする請求項1に記載の発光装置。
- 上記橙色蛍光体は、Liを4重量%以下含有することを特徴とする請求項1に記載の発光装置。
- 上記橙色蛍光体は、Ceを6重量%以下含有することを特徴とする請求項1に記載の発光装置。
- 上記橙色蛍光体は、発光スペクトルの半値幅が120nm以上150nm以下であることを特徴とする請求項1に記載の発光装置。
- 上記緑色蛍光体は、発光スペクトルの半値幅が55nm以下であることを特徴とする請求項1に記載の発光装置。
- 上記緑色蛍光体は、Eu賦活酸窒化物系蛍光体であることを特徴とする請求項1に記載の発光装置。
- 上記緑色蛍光体はEu賦活βサイアロン蛍光体であることを特徴とする請求項1に記載の発光装置。
- 上記Eu賦活βサイアロン蛍光体は、600nmにおける光の吸収率が10%以下であることを特徴とする請求項8に記載の発光装置。
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JPWO2012014701A1 (ja) | 2013-09-12 |
US20130277698A1 (en) | 2013-10-24 |
JP5783512B2 (ja) | 2015-09-24 |
US8901591B2 (en) | 2014-12-02 |
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