WO2011105157A1 - 発光装置 - Google Patents
発光装置 Download PDFInfo
- Publication number
- WO2011105157A1 WO2011105157A1 PCT/JP2011/051600 JP2011051600W WO2011105157A1 WO 2011105157 A1 WO2011105157 A1 WO 2011105157A1 JP 2011051600 W JP2011051600 W JP 2011051600W WO 2011105157 A1 WO2011105157 A1 WO 2011105157A1
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- WIPO (PCT)
- Prior art keywords
- phosphor
- light
- emitting device
- orange
- semiconductor light
- Prior art date
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—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
-
- 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
-
- 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
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/77347—Silicon Nitrides or Silicon Oxynitrides
-
- 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
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/77348—Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides
-
- 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
-
- 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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- 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 devices such as light emitting diodes (LEDs) have the advantage of being small in size, consuming little power and being able to stably emit light with high brightness.
- the movement to replace lighting fixtures using light emitting devices composed of LEDs that emit light is progressing.
- LED that emits white light for example, there is a combination of a blue LED and a YAG-based phosphor represented by a composition formula of (Y, Gd) 3 (Al, Ga) 5 O 12 .
- white light is realized by mixing the blue light of the LED and the yellow light emitted from the YAG phosphor of the phosphor.
- the red component is insufficient due to the light emission characteristics of the YAG phosphor, and it is unsuitable for emitting warm white light that is close to the color of a light bulb required for home lighting fixtures.
- a light emitting device that can emit a warm red white color by further combining a nitride red phosphor in addition to a blue LED and a YAG phosphor (for example, , See Patent Document 1).
- a special color rendering index (R9) that exhibits a high color rendering index (Ra), particularly a red color appearance, at a color temperature in a bulb color region of 3,250 K or less. ) Becomes a light emitting device that emits white light having an excellent value.
- the red phosphor absorbs the fluorescence emitted from the YAG phosphor, the influence of mutual absorption between the phosphors is large, and the light emission efficiency of the light emitting device is significantly reduced.
- a configuration that suppresses mutual absorption between phosphors, including a yellow or red phosphor whose intensity at a wavelength of 520 nm of the excitation spectrum is 60% or less of the intensity at the peak wavelength of the excitation spectrum is exemplified (for example, Patent Document 2).
- the present invention has been made in view of the above problems, and an object of the present invention is to realize a light emitting device that exhibits high color rendering and emits white light in a light bulb color region with high efficiency.
- a light-emitting device is configured using a phosphor and a semiconductor light-emitting element
- a phosphor having a wider half-value width of an emission spectrum in order to improve color rendering.
- the present inventor has a half of the green phosphor contrary to such common technical knowledge. It has been found that by reducing the value width, it is possible to realize a light emitting device that exhibits high color rendering and emits white light in a light bulb color region with high efficiency.
- the present invention is contrary to conventional technical common sense, and thus could not be easily accomplished even by those skilled in the art.
- the green phosphor exemplified in Patent Document 2 has an emission spectrum half-width of about 65 nm to 120 nm, and the yellow to red phosphor has an emission spectrum half-width of 4 nm to 120 nm. Comparing the half width of the spectrum with the half width of the emission spectrum of the yellow or red phosphor, the half width of the emission spectrum tends to be equal to that of the green phosphor (paragraph [0028] in Patent Document 2, [0030] to [0028]).
- a semiconductor light emitting device is a semiconductor light emitting device that emits white light in a light bulb color region, and which absorbs the blue light.
- the orange phosphor has a peak wavelength of an emission spectrum of 590 nm or more and 630 nm or less, and a half of the peak.
- the value width is 130 nm or more
- the half-value width of the emission spectrum of the orange phosphor is wider than the half-value width of the emission spectrum of the green phosphor
- the peak wavelength of the absorption rate of the orange phosphor is 420 nm or more
- the orange phosphor The absorption rate of the orange phosphor at the peak wavelength of absorption is ABS (MAX)
- the absorption rate of the orange phosphor at the wavelength of 530 nm is ABS (530).
- ABS (530) / ABS to (MAX) ⁇ 0.60 It is characterized by satisfying.
- the orange phosphor has a peak wavelength of an emission spectrum of 590 nm or more and 630 nm or less, a half width of the peak is 130 nm or more, and an emission spectrum of the orange phosphor.
- the half width of the orange phosphor is wider than the half width of the emission spectrum of the green phosphor, the orange phosphor has a peak absorption wavelength of 420 nm or more, and the orange phosphor has a peak absorption wavelength of the orange phosphor.
- ABS (MAX) absorption rate
- ABS (530) absorption rate of the orange phosphor at a wavelength of 530 nm
- ABS (530) absorption rate of the orange phosphor at a wavelength of 530 nm
- FIG. 1 It is sectional drawing which shows schematic structure of the semiconductor device which concerns on this Embodiment. It is a graph which shows the chromaticity point area
- 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.
- 6 is a graph showing an absorption spectrum of the phosphor powder obtained in Production Example 1-2.
- 6 is a graph showing the XRD measurement result of the phosphor powder obtained in Production Example 2-1.
- 6 is a graph showing an emission spectrum of the phosphor powder obtained in Production Example 2-1. It is a graph which shows the XRD measurement result of the fluorescent substance powder obtained in manufacture example 2-2.
- 6 is a graph showing an emission spectrum of the phosphor powder obtained in Production Example 2-2.
- 6 is a graph showing an emission spectrum of the phosphor powder obtained in Production Example 2-3.
- 6 is a graph showing an emission spectrum of the phosphor powder obtained in Production Example 2-4.
- 4 is a graph showing an emission spectrum of the phosphor powder obtained in Comparative Production Example 1.
- 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.
- 10 is a graph showing an emission spectrum of the light emitting device manufactured in Example 5.
- 10 is a graph showing an emission spectrum of the light emitting device manufactured in Example 6.
- 10 is a graph showing an emission spectrum of the light emitting device manufactured in Example 7.
- 10 is a graph showing an emission spectrum of the light emitting device manufactured in Example 8.
- 10 is a graph showing an emission spectrum of the light emitting device manufactured in Example 9.
- 10 is a graph showing an emission spectrum of the light emitting device manufactured in Example 10.
- 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. It is a graph which shows the Li density
- FIG. 1 is a cross-sectional view showing a schematic configuration of a semiconductor device according to the present embodiment.
- a semiconductor light emitting device 1 is a semiconductor light emitting device 1 that emits white light in a light bulb color region, and a semiconductor light emitting element 2 that emits blue light, and an orange that absorbs the blue light and emits orange light.
- a phosphor 13 and a green phosphor 14 that absorbs the blue light and emits green light are provided.
- the orange phosphor 13 has a peak wavelength of an emission spectrum of 590 nm or more and 630 nm or less, and a half width of the peak is 130 nm or more.
- the orange phosphor 13 has a peak absorption wavelength of 420 nm or more, and the orange phosphor has an absorption rate of ABS (MAX) at a wavelength of 530 nm.
- ABS (530) the absorption rate of the phosphor is ABS (530)
- ABS (MAX) ⁇ 0.60 Meet.
- Patent Document 2 a phosphor that emits light at a longer wave than the green phosphor in the combination of a blue LED, a green phosphor, and a yellow or red phosphor, as in the present invention (in Patent Document 2, yellow to red fluorescence).
- Patent Document 2 yellow to red fluorescence.
- the following two points are significantly different from the configuration according to the present invention. .
- Patent Document 2 defines an excitation (absorption) rate at a wavelength of 520 nm with respect to the maximum value of the excitation (absorption) spectrum
- the configuration according to the present invention defines an excitation (absorption) rate at a wavelength of 530 nm. ing.
- the excitation (absorption) peak exists at 350 nm as in Example 3 of Patent Document 2, and the excitation (absorption) efficiency is gentle up to the green wavelength region.
- a configuration using a decreasing phosphor is also included. In such a configuration, even if the excitation (absorption) intensity of the wavelength in the green light region is low relative to the excitation (absorption) intensity of the wavelength at the excitation peak, the excitation (absorption) of the wavelength in the blue light region that is the actual excitation light is low. ) Since the intensity and the excitation (absorption) intensity of the wavelength in the green light region are close to each other, if the excitation light is absorbed with high efficiency, the absorption of the green light also increases as a result.
- the orange phosphor according to the present invention has a peak wavelength range of excitation (absorption) spectrum of 420 nm or more, the above-described problems cannot occur.
- the half-value width of the emission spectrum of the orange phosphor is defined as 130 nm or more, and the half-value width of the emission spectrum of the green phosphor is the emission of the orange phosphor. Since it is defined to be narrower than the half-value width of the spectrum, the green light absorption of the orange phosphor is further suppressed from the configuration of Patent Document 2. For this reason, even if the excitation (absorption) spectrum of the orange phosphor shifts to a longer wavelength side than Patent Document 2, green absorption is sufficiently suppressed. As a result, a light emitting device that exhibits high color rendering properties and emits white light in the light bulb color region with high efficiency can be realized.
- the “blue light” means light having an emission spectrum peak at a wavelength of 420 to 480 nm
- the “green light” has an emission spectrum peak at a wavelength of 500 to 550 nm.
- the term “orange light” means light having an emission spectrum peak at a wavelength of 570 to 630 nm.
- the “green phosphor” is a substance that emits the green light when excited by the blue light, and the “orange phosphor” means a substance that emits the orange light.
- the semiconductor light emitting element 2 is placed on a printed wiring board 3 as a base, and the resin frame 4 placed on the printed wiring board 3 is placed inside the resin frame 4.
- the semiconductor light emitting element 2 is sealed by being filled with a mold resin 5 made of a translucent resin in which the orange phosphor 13 and the green phosphor 14 are dispersed.
- 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 device 1 according to the present embodiment is not limited to the structure shown in FIG. 1, and a conventionally known general semiconductor light emitting device structure can be adopted.
- the semiconductor light emitting device 1 according to the present embodiment is a semiconductor light emitting device that emits white light in a light bulb color region
- the peak wavelength of light emitted by the semiconductor light emitting device 1 according to the present embodiment is around 600 nm.
- a wavelength in the vicinity of 630 to 640 nm is important.
- the emission intensity at the peak wavelength is PI (MAX)
- the emission intensity at a wavelength 40 nm longer than the peak wavelength is PI (40)
- White light in the light bulb color region means that the color temperature (TCP) of the emitted light is in the range of 2600K to 3250K, and the chromaticity point of the emitted light is specified in JIS Z9112 shown in FIG. Is within the specified range.
- 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 (A conventionally known element that emits blue light, such as an electroluminescence element, can be used.
- 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 420 to 480 nm from the viewpoint of light emission efficiency. Further, from the viewpoint of increasing the excitation efficiency of the phosphor and further raising the Ra and R9 values, it is more preferably in the range of 440 to 470 nm, and particularly high color rendering performance is in the range of 455 nm or more.
- the orange phosphor 13 has an emission spectrum peak wavelength of 590 nm or more and 630 nm or less, a half width of the peak of 130 nm or more, and absorption of the orange phosphor on the longer wavelength side than 420 nm.
- the maximum value of the rate is ABS (MAX)
- the absorption rate of the orange phosphor at a wavelength of 530 nm is ABS (530)
- the following relationship is given: ABS (530) / ABS (MAX) ⁇ 0.60 Meet.
- the peak wavelength of the emission spectrum and the half-value width of the peak are within the above ranges, semiconductor light emission having higher color rendering properties when light bulb color light is composed of a mixed color of the semiconductor light emitting element 2 and the green phosphor 14.
- the device can be realized. Further, when the absorption rate of the orange phosphor 13 satisfies the above condition, the orange phosphor 13 can sufficiently suppress the absorption of green light, and a light emitting device with higher luminous efficiency can be realized.
- the upper limit of the half width in the emission spectrum of the orange phosphor 13 is not particularly limited, but is preferably 160 nm or less, and more preferably 150 nm or less.
- the orange phosphor 13 preferably has an excitation peak at 440 nm to 470 nm in its excitation spectrum.
- the excitation spectrum of the orange phosphor 13 satisfies the above requirements, a light emitting device with higher luminous efficiency can be realized.
- the orange phosphor 13 is not particularly limited as long as it is an orange phosphor exhibiting an emission spectrum with the above peak wavelength and half width, but is preferably a Ce activated phosphor activated by Ce. This is because Ce has a large spin-orbit splitting at the ground level, so that the Ce-activated phosphor exhibits a wide emission spectrum.
- Ce-activated phosphor a Ce-activated nitride phosphor or a Ce-activated oxynitride phosphor can be suitably used.
- Nitride-based phosphors and oxynitride-based phosphors for example, have a stronger matrix covalent bond than oxide-based phosphors and sulfide-based phosphors.
- the emission intensity is unlikely to decrease.
- the orange phosphor 13 is represented by the following general formula (1) among the Ce activated nitride phosphor or Ce activated oxynitride phosphor.
- (1-a-b) (Ln ′ p M (II) ′ (1-p) M (III) ′ M (IV) ′ N 3 ) ⁇ a (M (IV) ′ (3n + 2) / 4 N n O) ⁇ b (A ⁇ M (IV) ′ 2 N 3 )
- Ln ′ is at least one metal element selected from the group consisting of lanthanoids, Mn and Ti
- M (II) ′ is one or more elements selected from the group consisting of divalent metal elements other than the Ln ′ element
- M (III) ′ is one or more elements selected from the group consisting of trivalent metal elements
- M (IV) ′ is one or more elements selected from the group consisting of tetravalent metal elements
- A is one or more monovalent metal elements selected from the group consisting
- the compound having the composition represented by the formula (1) can be obtained, for example, by mixing nitrides or oxides of each constituent metal element at a ratio that achieves a desired composition ratio and firing.
- CaAlSiN 3 activated by Ce that emits orange light can be exemplified, and it can be produced according to the description of Japanese Patent No. 3837588.
- the CaAlSiN 3 phase described in Japanese Patent No. 3837588 is used as a base material of a phosphor, a site where the metal element coordinated with Ce is Si and a site where Al is mixed are randomly mixed. Compared with phosphors activated on other base materials, a broader emission spectrum is exhibited.
- p is 0 ⁇ p ⁇ 0.2, more preferably 0.005 ⁇ p ⁇ 0.1, and a is 0 ⁇ a ⁇ 0.45.
- 0 ⁇ a ⁇ 0.3 is preferable, 0.002 ⁇ a ⁇ 0.3 is more preferable, and 0.15 ⁇ a ⁇ 0.3 is still more preferable.
- y is 0 ⁇ y ⁇ 0.2, preferably 0.003 ⁇ y ⁇ 0.2, x is 0 ⁇ x ⁇ 1.0, It is preferable that 0.02 ⁇ x ⁇ 0.4, and more preferably 0.03 ⁇ x ⁇ 0.35.
- oxygen and Li are contained in the base crystal of the Ce-activated phosphor.
- the host crystal may contain only one of oxygen and Li, or both, and more preferably both.
- the Ce-activated phosphor is cCaAlSiN 3.
- (1-c) LiSi 2 N 3 (4) (Where 0.2 ⁇ c ⁇ 0.8) Is a solid solution crystal in which Ce and oxygen are in solid solution, the peak wavelength of the emission spectrum is longer, the half width is wider, the absorption of green light emission is suppressed, and the orange light emission Is particularly preferable when a light-emitting device that shows white in the light bulb color region is combined with a green phosphor.
- the Ce-activated phosphor into a solid solution crystal in which Ce and oxygen are dissolved in the crystal having the above composition, for example, it is necessary to include at least one oxide of a constituent metal element in the raw material powder such as CeO 2 There is.
- the Li concentration in the solid solution crystal in which Ce and oxygen are in solid solution is preferably 4% by weight or less from the viewpoint of luminous efficiency.
- the semiconductor light emitting element when used for a lighting fixture or the like, it is necessary to pass a larger current than when it is used for an indicator or the like, and the ambient temperature of the semiconductor light emitting element reaches 100 ° C. to 150 ° C.
- the YAG: Ce phosphor exemplified in Japanese Patent Application Laid-Open No. 2003-321675 has a light emission intensity that is 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. End up.
- 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 is maintained even in a high temperature environment of ambient temperature of 100 ° C. to 150 ° C.
- the phosphor included in the semiconductor light emitting device according to the present embodiment also preferably has a light emission characteristic in a high temperature environment equivalent to the phosphor exemplified in the non-patent document. From such a viewpoint, Ce and oxygen
- the Ce concentration in the solid solution crystal in which is dissolved is preferably more than 0 wt% and not more than 6 wt%.
- the Li concentration in the solid solution crystal in which Ce and oxygen are dissolved is preferably 1.5% by weight or more from the viewpoint of widening the half width of the emission spectrum.
- the wider the half-value width of the emission spectrum of the orange phosphor 13 the higher the color rendering property and the higher the light emission efficiency.
- the particle size of the orange phosphor 13 is preferably 1 ⁇ m to 50 ⁇ m, and more preferably 5 ⁇ m to 20 ⁇ m.
- the shape of the particles is preferably single particles rather than aggregates, and specifically, the specific surface area is 1 g / m 2 or less, more preferably 0.4 g / m 2 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.
- a semiconductor light emitting device combining the Ce-activated CaAlSiN 3 phosphor and the green phosphor is also disclosed in Japanese Patent Application Laid-Open No. 2008-530334, and FIG. 2 of the same publication discloses a Ce-activated CaAlSiN 3 phosphor. Excitation spectra are illustrated. However, the configuration according to the present invention is different from the invention described in Japanese Patent Application Laid-Open No. 2008-530334.
- the Ce-activated CaAlSiN 3 phosphor disclosed in Japanese Patent Application Laid-Open No. 2008-530334 is compared with the Ce-activated CaAlSiN 3 phosphor exemplified in the present specification in the green light region of the orange phosphor.
- the excitation efficiency in the light source is high (that is, ABS (530) / ABS (MAX) ⁇ 0.60 is not satisfied), and thus when the light emitting device is constructed, the mutual absorption of the phosphors becomes large, and the light emitting device emits light. Reduces efficiency significantly.
- the configuration according to the present invention includes an orange phosphor having optimum light emission characteristics and absorption characteristics when a blue LED, a green phosphor, and an orange phosphor are combined.
- LiSi 2 N 3 (where 0.2 ⁇ c ⁇ 0.8) is used as a specific Ce-activated CaAlSiN 3 phosphor for realizing optimum light emission characteristics and absorption characteristics. It has been found that a solid solution crystal in which Ce and oxygen are in solid solution is suitable for the crystal having the composition of Therefore, it is possible to realize a light emitting device that exhibits high color rendering properties and emits white light in a light bulb color region with high efficiency.
- the green phosphor 14 has a half-value width of the emission spectrum narrower than that of the orange phosphor 13, and the half-value width of the emission spectrum is more preferably 70 nm or less, and more preferably 55 nm or less. . Further, 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 Japanese Patent Application Laid-Open No. 2008-138156 and the Eu-activated ⁇ sialon fluorescent material disclosed in Japanese Patent Application Laid-Open No. 2005-255895 are excellent.
- the body is preferably used.
- the Eu-activated ⁇ sialon phosphor is particularly excellent in stability and temperature characteristics, and has a particularly narrow emission spectrum and a particularly excellent emission characteristic.
- Eu-activated ⁇ sialon phosphor specifically, Si 6-z ′ Al z ′ O z ′ N 8-z ′ (However, 0 ⁇ z ′ ⁇ 4.2)
- a phosphor having the following composition is preferable, and a more preferable range of z ′ is 0 ⁇ z ′ ⁇ 0.5.
- the Eu-activated ⁇ sialon preferably has an oxygen concentration in the range of 0.1 to 0.6% by weight, more preferably an Al concentration of 0.13 to 0.8% by weight. If the Eu-activated ⁇ sialon phosphor is within these ranges, the half-value 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 which 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 diameter 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 single particles rather than aggregates, and specifically, the specific surface area is 1 g / m 2 or less, more preferably 0.4 g / m 2 or less. preferable.
- techniques such as mechanical pulverization, grain boundary phase removal by acid treatment, and annealing treatment can be used as appropriate.
- the green phosphor 14 used in the present embodiment is an Eu-activated oxynitride phosphor and the orange phosphor 13 is a Ce-activated nitride phosphor or a Ce-activated oxynitride phosphor, Since both of these two types of phosphors are nitride-based, the temperature dependency, specific gravity, particle size, etc. of the two types of phosphors are close to each other.
- the semiconductor light emitting device as described above when the semiconductor light emitting device as described above is formed, the light emitting device can be manufactured with a high yield and is not easily influenced by the surrounding environment.
- the nitride-based phosphor since 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. It is.
- the dispersion method is not particularly limited, and a conventionally known method can be employed.
- the mixing ratio of the orange phosphor 13 and the green phosphor 14 to be dispersed is not particularly limited, and can be appropriately determined so as to emit white light in a light bulb color region.
- the weight ratio of the translucent resin to the orange phosphor 13 and the green phosphor 14 (the weight of the translucent resin / (orange phosphor 13 + green phosphor 14)) can be in the range of 2 to 20.
- the weight ratio of the green phosphor 14 to the orange phosphor 13 (the weight ratio of the green phosphor 14 / the orange phosphor 13) can be in the range of 0.05 to 1.
- the printed wiring board 3 the adhesive 10, the metal wire 12, etc. other than the semiconductor light emitting element 2, the orange phosphor 13, the green phosphor 14 and the mold resin 5.
- a configuration similar to that of the prior art for example, Japanese Patent Application Laid-Open No. 2003-321675, Japanese Patent Application Laid-Open No. 2006-8721, etc.
- a semiconductor light emitting device that emits blue light, a green phosphor that absorbs the blue light and emits green light, and an orange phosphor that absorbs the blue light and emits orange light, the orange phosphor
- the peak wavelength of the emission spectrum is not less than 590 nm and not more than 630 nm, the full width at half maximum of the peak is not less than 130 nm, and the maximum value of the absorbance of the orange phosphor on the longer wavelength side than 420 nm is ABS (MAX), wavelength
- the semiconductor light-emitting device characterized by satisfy
- the Ce activated nitride phosphor or the Ce activated oxynitride phosphor is represented by the following general formula (1): (1-a-b) (Ln ′ p M (II) ′ (1-p) M (III) ′ M (IV) ′ N 3 ) ⁇ a (M (IV) ′ (3n + 2) / 4 N n O ) ⁇ B (A ⁇ M (IV) ′ 2 N 3 ) (1)
- Ln ′ is at least one metal element selected from the group consisting of lanthanoids, Mn and Ti
- M (II) ′ is one or more elements selected from the group consisting of divalent metal elements other than the Ln ′ element
- M (III) ′ is one or more elements selected from the group consisting of trivalent metal elements
- M (IV) ′ is one or more elements selected from the group consisting of tetravalent metal elements
- A is one or more monovalent metal elements selected from the group consisting of Li, Na, and K
- a, b and n are numbers satisfying 0 ⁇ a, 0 ⁇ b, 0 ⁇ a + b ⁇ 1, 0 ⁇ n, and 0.002 ⁇ (3n + 2) a / 4 ⁇ 0.9)
- the semiconductor light-emitting device according to (3) which is a solid solution crystal in which Ce and oxygen are dissolved in a crystal having the following composition.
- the green phosphor preferably has a half width of the emission spectrum of 70 nm or less.
- the orange phosphor is preferably a Ce-activated nitride-based or oxynitride-based phosphor.
- the orange phosphor is a Ce activated CaAlSiN 3 phosphor, cCaAlSiN 3 ⁇ (1-c) LiSi 2 N 3 (However, 0.2 ⁇ c ⁇ 0.8) A solid solution crystal in which Ce and oxygen are dissolved in a crystal having the composition
- the luminous efficiency of the orange light emitter is particularly high, a light emitting device with higher luminous efficiency can be realized.
- the solid solution crystal preferably contains Ce in a range of 6% by weight or less.
- 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 ⁇ sialon phosphor.
- the Eu-activated ⁇ sialon phosphor is efficiently excited by blue light and emits light that satisfies the requirements of the present invention when excited by blue light.
- the Eu activated ⁇ sialon preferably has an oxygen concentration in the range of 0.1 wt% to 0.6 wt%.
- the Eu-activated ⁇ sialon phosphor has an absorptance of 10% or less at 600 nm.
- Excitation spectrum and emission spectrum 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 absorption spectrum of the phosphor powder was measured using a measurement system that combined 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 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 had a Li concentration of 3.23% by weight and a Ce concentration of 2.40% by weight.
- 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 composition of the phosphor obtained in this production example which was obtained from the above Li concentration obtained by ICP measurement, was 0.45CaAlSiN 3 .0.55LiSi 2 N 3 .
- 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.
- the XRD chart shown in FIG. 3 was obtained, and the phosphor powder had 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. 4 is a graph showing the 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. 5 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).
- FIG. 6 is an absorption spectrum of the phosphor powder obtained in this production example.
- the absorption rate at the peak wavelength of the phosphor of this production example is ABS (MAX), and the absorption rate at a wavelength of 530 nm is ABS (MAX).
- ABS (MAX) 0.52.
- 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 obtained fired product was washed with water to remove excess Li 3 N, and then coarsely pulverized and then manually pulverized using an alumina mortar to obtain a phosphor powder.
- the phosphor powder had a Li concentration of 3.19% by weight and a Ce concentration of 4.66% by weight.
- 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 composition of the phosphor obtained in this production example obtained from the above Li concentration obtained by ICP measurement was 0.46CaAlSiN 3 .0.54LiSi 2 N 3 .
- 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.
- the XRD chart shown in FIG. 7 was obtained, and the phosphor powder had a crystal structure having a CaAlSiN 3 phase as a main phase. It could be 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 emitted orange light.
- FIG. 8 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. 9 is a graph showing an excitation spectrum of the obtained phosphor powder, where the vertical axis represents excitation intensity (arbitrary unit) and the horizontal axis represents wavelength (nm).
- FIG. 10 is an absorption spectrum of the phosphor powder obtained in this production example.
- the absorption rate at the peak wavelength of the phosphor of this production example is ABS (MAX), and the absorption rate at a wavelength of 530 nm is ABS (MAX).
- ABS (MAX) 0.57.
- 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.
- FIG. 30 shows a graph showing the Li concentration dependence of the luminescence intensity of the obtained various solid solution crystals.
- 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. 31 and FIG. 32 graphs showing the ambient temperature dependence of the emission intensity when excited with light having a wavelength of 450 nm for the various solid solution crystals obtained are shown in FIGS. From FIG. 31 and FIG. 32, it is understood that even if the Li concentration in the solid solution crystal increases, the emission intensity in the high temperature environment does not decrease, but when the Ce concentration increases, the emission intensity in the high temperature environment tends to decrease. It can be seen that the Ce concentration in 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. 33 shows the Li concentration dependence of the half-value width of the emission spectrum when the various solid solution crystals are excited with light having a wavelength of 450 nm. From FIG. 33, 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 phosphor sample.
- the obtained phosphor sample was pulverized in an agate mortar 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. 12 was obtained.
- the vertical axis represents emission intensity (arbitrary unit), and the horizontal axis represents wavelength (nm).
- the crucible is set in a graphite resistance heating type pressure electric furnace, and the firing atmosphere is evacuated by a diffusion pump, and is heated from room temperature to 800 ° C. at a rate of 500 ° C. per hour.
- 999 vol% nitrogen was introduced to adjust the pressure to 0.5 MPa, the temperature was raised to 1300 ° C. at 500 ° C. per hour, then raised to 1600 ° C. at 1 ° C. per minute, and held at that temperature for 8 hours.
- the synthesized sample was pulverized into powder with an agate mortar to obtain a powder sample.
- the powder fired at 1600 ° C. was pulverized using a silicon nitride mortar and pestle and then naturally dropped into a boron nitride crucible having a diameter of 20 mm and a height of 20 mm.
- the crucible is set in a graphite resistance heating type pressure electric furnace, and 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 99.999% by volume at 800 ° C. Then, the pressure was adjusted to 1 MPa, and then the temperature was increased to 1900 ° C. at 500 ° C. per hour, and the temperature was further maintained 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. 14 was obtained.
- the vertical axis represents emission intensity (arbitrary unit), and the horizontal axis represents wavelength (nm).
- oxygen content contained in these synthetic powders was measured using the oxygen-nitrogen analyzer by a combustion method (TC436 type
- oxygen content was 0.4 weight%.
- the absorptance of light having a wavelength of 600 nm was measured using MCPD-7000 (manufactured by Otsuka Electronics Co., Ltd.) and found to be 12.5%.
- the obtained slurry was oven-dried at 100 ° C., and the obtained powder aggregate was pulverized by a dry rolling ball mill using an agate ball and a nylon pot to obtain fine particles having a particle size of about 10 ⁇ m. After filling the obtained fine particles into an alumina crucible and applying compression molding with light weighting, it is fired in air at 1100 ° C. for 3 hours, and the resulting fired body is pulverized with an agate mortar to produce a precursor sample Got.
- 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. After introducing 999 vol% nitrogen to a pressure of 1 MPa, the temperature was raised to 1300 ° C. at 500 ° C. per hour and further maintained at that temperature for 2 hours to obtain a phosphor sample.
- the fired product obtained is pulverized with an agate mortar, filled again into an alumina crucible, lightly applied and compression molded, then fired in a nitrogen atmosphere at 1300 ° C. for 48 hours, and then pulverized with an agate mortar.
- a phosphor powder was obtained.
- the emission spectrum shown in FIG. 15 was obtained.
- the vertical axis represents emission intensity (arbitrary unit), and the horizontal axis represents wavelength (nm).
- the vertical axis represents emission intensity (arbitrary unit), and the horizontal axis represents wavelength (nm).
- the obtained pre-fired powder was fired in a reducing atmosphere of N 2 (95%) + H 2 (5%) at 1550 ° C. for 3 hours, and the obtained fired body was pulverized with an agate mortar to obtain a phosphor. A powder was obtained.
- the vertical axis represents emission intensity (arbitrary unit), and the horizontal axis represents wavelength (nm).
- ABS (530) / ABS (MAX) when the absorption rate at the peak wavelength of the phosphor obtained in this production example is ABS (MAX) and the absorption rate at the wavelength of 530 nm is ABS (530) 0.82.
- Examples 1 to 10 The phosphor shown in Table 4 is mixed with a silicone resin (trade name: KER2500, manufactured by Shin-Etsu Silicone Co., Ltd.) at a weight ratio shown in Table 4 and dispersed in the silicone resin, as shown in FIG. Each semiconductor light emitting device of Examples 1 to 10 having the above structure was manufactured.
- a silicone resin trade name: KER2500, manufactured by Shin-Etsu Silicone Co., Ltd.
- LED (trade name: EZR, manufactured by Cree) having an emission peak wavelength shown in Table 4 was used as the semiconductor light emitting element.
- the mixing ratio with the mold resin and the peak wavelength of the LED were adjusted so that the color temperature of each light-emitting device was a light bulb color.
- 18 to 27 show emission spectra of the semiconductor light emitting device exemplified in this example, and Table 5 shows various characteristics of each semiconductor light emitting device.
- LED (trade name: EZR, manufactured by Cree) having an emission peak wavelength shown in Table 4 was used as the semiconductor light emitting element.
- the mixing ratio with the mold resin and the peak wavelength of the LED were adjusted so that the color temperature of each light-emitting device was a light bulb color.
- the emission spectra of the semiconductor light emitting devices illustrated in FIGS. 18 to 29 were measured with a spectrophotometer (product name: MCPD-7000, manufactured by Otsuka Electronics), and the indices shown in Tables 5 and 6 were measured. Calculation was based on the emission spectrum.
- 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 emission characteristics of each light emitting device will be compared with Tables 5 and 6.
- the light emitting devices of Examples 1 to 10 show higher values for both Ra and R9 than the light emitting devices of Comparative Examples 1 and 2, and are suitable for general lighting such as home lighting. I understand that. This is because in the light-emitting devices manufactured in Examples 1 to 10, the fluorescent spectrum of the phosphor satisfies the requirements of the present invention. In particular, since the light emitting devices of Examples 1 to 10 have a wide half-value width of the orange phosphor, the index of the red component is improved.
- the examples 4 and 5 the examples 6 and 7, and the examples 8 and 9
- the LED peak wavelength is compared. It can be seen that the color rendering property is higher at 460 nm than at 450 nm. From this, it was confirmed in the present invention that the color rendering properties are better when the peak wavelength of the LED is 455 nm or more.
- the semiconductor light emitting devices of the example and the comparative example are compared.
- the orange phosphor does not satisfy the requirements of the present invention, the half-value width of the emission spectrum of the green phosphor is wider than that of the orange phosphor, and the absorption of green light by the orange phosphor is particularly large. Then the light intensity is particularly low.
- the peak wavelengths of the orange phosphor and the green phosphor are the same, and only the half width of the green phosphor is different.
- the half width of the green phosphor is wide, the color rendering property tends to decrease with the light intensity. That is, in the present invention, it is understood that the narrow half-value width of the green phosphor is advantageous not only in terms of luminous intensity but also in terms of color rendering properties.
- the orange phosphor is ABS (530) / ABS. It can be seen that the luminous efficiency is increased by satisfying the requirement of (MAX) ⁇ 0.6.
- LED (trade name: EZR, manufactured by Cree) having an emission peak wavelength of 460 nm was used as the semiconductor light emitting element.
- FIG. 34 is a graph showing the relationship between the luminous efficiency and the orange phosphor ABS (530) / ABS (MAX) ABS (530) for each of the obtained semiconductor devices and the semiconductor devices of Examples 1 and 3. .
- the semiconductor light emitting device of the present invention emits light bulb color light having high luminous efficiency and 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.
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Abstract
Description
ABS(530)/ABS(MAX)<0.60
を満たすことを特徴としている。
ABS(530)/ABS(MAX)<0.60
を満たすことを特徴としている。
ABS(530)/ABS(MAX)<0.60
を満たす。
(1)特許文献2の構成では、橙色蛍光体の励起(吸収)スペクトルのピーク波長の範囲を規定していない。
(2)特許文献2では励起(吸収)スペクトルの最大値に対して波長520nmの励起(吸収)率を規定しているが、本発明に係る構成では波長530nmの励起(吸収)率を規定している。
PI(40)/PI(MAX)>0.70
を満たすことがより好ましい。
本実施の形態では、上記半導体発光素子2は発光ダイオード(LED)であるが、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、発光スペクトルのピーク波長が590nm以上630nm以下であり、当該ピークの半値幅が130nm以上であり、420nmより長波長側における、上記橙色蛍光体の吸収率の最大値をABS(MAX)、波長530nmにおける、上記橙色蛍光体の吸収率をABS(530)としたときに以下の関係
ABS(530)/ABS(MAX)<0.60
を満たす。
(1-a-b)(Ln’pM(II)’(1-p)M(III)’M(IV)’N3)・a(M(IV)’(3n+2)/4NnO)・b(A・M(IV)’2N3) …(1)
(式中、Ln’は、ランタノイド、Mn及びTiからなる群から選ばれる少なくとも1種の金属元素であり、
M(II)’はLn’元素以外の2価の金属元素からなる群から選ばれる1種又は2種以上の元素であり、
M(III)’は3価の金属元素からなる群から選ばれる1種又は2種以上の元素であり、
M(IV)’は4価の金属元素からなる群から選ばれる1種又は2種以上の元素であり、
Aは、Li、Na、及びKからなる群から選ばれる1種類以上の1価の金属元素であり、pは0≦p≦0.2を満足する数であり、
a、b及びnは、0≦a、0≦b、a+b>0、0≦n、及び0.002≦(3n+2)a/4≦0.9を満足する数である)
で表される化学組成を有する、Ceを含有した結晶相を含有する蛍光体であることが好ましい。
(1-a)(CepCa1-pAlSiN3)・aSi2N2O …(2)
(1-x)(Cey(Ca、Sr)1-yAlSiN3)・xLiSi2N3 …(3)
で示される組成が例示でき、特開2007-231245号の記載に準じて製造することができる。
cCaAlSiN3・(1-c)LiSi2N3 …(4)
(式中、0.2≦c≦0.8である)
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る場合は、より発光スペクトルのピーク波長が長波長でありかつ半値幅が広く、緑色発光の吸収が抑制され、かつ橙色発光の発光効率が特に高いため、緑色蛍光体と組み合わせて電球色領域の白色を示す発光装置を構成する際はより好ましい。
上記緑色蛍光体14は、発光スペクトルの半値幅が上記橙色蛍光体13より狭く、発光スペクトルの半値幅が70nm以下であることがより好ましく、55nm以下であるものが更に好ましい。また、上記緑色蛍光体14の発光スペクトルの半値幅の下限は、特には限定されないが、15nm以上が好ましく、40nm以上がより好ましい。
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。
上記半導体発光装置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半導体発光装置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)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緑色光を発する緑色蛍光体と、当該青色光を吸収して橙光を発する橙色蛍光体とを備え、上記橙色蛍光体は、発光スペクトルのピーク波長が590nm以上630nm以下であり、当該ピークの半値幅が130nm以上であり、420nmより長波長側における、上記橙色蛍光体の吸収率の最大値をABS(MAX)、波長530nmにおける、上記橙色蛍光体の吸収率をABS(530)としたときに以下の関係
ABS(530)/ABS(MAX)<0.60
を満たすことを特徴とする半導体発光装置。
(1-a-b)(Ln’pM(II)’(1-p)M(III)’M(IV)’N3)・a(M(IV)’(3n+2)/4NnO)・b(A・M(IV)’2N3) …(1)
(式中、Ln’は、ランタノイド、Mn及びTiからなる群から選ばれる少なくとも1種の金属元素であり、
M(II)’はLn’元素以外の2価の金属元素からなる群から選ばれる1種又は2種以上の元素であり、
M(III)’は3価の金属元素からなる群から選ばれる1種又は2種以上の元素であり、
M(IV)’は4価の金属元素からなる群から選ばれる1種又は2種以上の元素であり、
Aは、Li、Na、及びKからなる群から選ばれる1種類以上の1価の金属元素であり、pは0<p≦0.2を満足する数であり、
a、b及びnは、0≦a、0≦b、0<a+b<1、0≦n、及び0.002≦(3n+2)a/4≦0.9を満足する数である)
で表される化学組成を有する結晶相を含有する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ることを特徴とする(3)に記載の半導体発光装置。
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であることが好ましい。
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。
蛍光体粉末の吸収スペクトルは、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合成した。
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合成した。
Si3N4、AlN、Li3N、Ca3N2、CeO2を表1に示す組成比率によって混合することにより、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濃度を表2に、ICP測定により得られたLi濃度から求めた各蛍光体の組成を表3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。
Si6-z’Alz’Oz’N8-z’で表される組成式において、z’=0.06のものにEuが0.10at.%賦活されたEu賦活βサイアロン蛍光体を得るべく、45μmの篩を通した金属Si粉末93.59重量%、窒化アルミニウム粉末5.02重量%及び酸化ユーロピウム粉末1.39重量%の組成となるように所定量秤量し、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。
β型窒化ケイ素粉末17.12重量%、酸化ケイ素粉末29.32重量%、炭酸バリウム粉末50.75重量%、及び酸化ユーロピウム粉末2.81重量%の組成となるようにメノウ製乳鉢と乳棒を用いて混合し、粉体混合物50gを得た。得られた粉体混合物を150ccのエタノール中でメノウ製ボールとナイロンポットとを用いた転動ボールミルにより混合し、スラリーを得た。
Lu2O3粉末63.7重量%、CeO2粉末6.1重量%、Al2O3粉末30.2重量%を所定の組成となるように空気中で秤量し、更に焼成助剤としてBaF2を所定量添加してメノウ製ボールとナイロンポットとを用いた転動ボールミルにより混合し、粉体混合物を得た。得られた混合物を石英ルツボに充填し、N2(95%)+H2(5%)の還元雰囲気で1400℃、5時間の条件で焼成し、得られた焼成体をメノウ製乳鉢により粉砕して蛍光体粉末を得た。
SrCO3粉末68.29重量%、BaCO3粉末18.48重量%、Eu2O3粉末1.98重量%、SiO2粉末11.25重量%を所定の組成となるように空気中で秤量し、メノウ製ボールとナイロンポットとを用いた転動ボールミルにより混合し、粉体混合物を得た。得られた混合物を石英ルツボに充填し、N2雰囲気下で1400℃、3時間の条件で予備焼成した後、得られた粉体焼結体をメノウ製乳鉢により粉砕して予備焼成粉を得た。得られた予備焼成粉を、N2(95%)+H2(5%)の還元雰囲気で1550℃、3時間の条件で焼成し、得られた焼成体をメノウ製乳鉢により粉砕して蛍光体粉末を得た。
<実施例1~10>
表4に示す蛍光体を、表4に示す重量比率でシリコーン樹脂(商品名:KER2500、信越シリコーン社製)と混合して当該シリコーン樹脂中に分散させたモールド樹脂を用いて、図1に示した構造を有する、実施例1~10の各半導体発光装置を作製した。
表4に示す蛍光体を、表4に示す重量比率でシリコーン樹脂(商品名:KER2500、信越シリコーン社製)と混合して当該シリコーン樹脂中に分散させたモールド樹脂を用いて、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。
表7に示す蛍光体を、表7に示す重量比率でシリコーン樹脂(商品名:KER2500、信越シリコーン社製)と混合して当該シリコーン樹脂中に分散させたモールド樹脂を用いて、図1に示した構造を有する各半導体発光装置を作製した。
2 発光素子
13 橙色蛍光体
14 緑色蛍光体
Claims (9)
- 電球色領域の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緑色光を発する緑色蛍光体と、
当該青色光を吸収して橙光を発する橙色蛍光体とを備え、
上記橙色蛍光体は、発光スペクトルのピーク波長が590nm以上630nm以下であり、当該ピークの半値幅が130nm以上であり、
橙色蛍光体の発光スペクトルの半値幅は、緑色蛍光体の発光スペクトルの半値幅より広く、
上記橙色蛍光体の吸収率のピーク波長が420nm以上であり、
上記橙色蛍光体の吸収率のピーク波長における、上記橙色蛍光体の吸収率をABS(MAX)、波長530nmにおける、上記橙色蛍光体の吸収率をABS(530)としたときに以下の関係
ABS(530)/ABS(MAX)<0.60
を満たすことを特徴とする半導体発光装置。 - 上記緑色蛍光体は、発光スペクトルの半値幅が70nm以下であることを特徴とする請求項1に記載の半導体発光装置。
- 上記橙色蛍光体は、Ce賦活窒化物系若しくは酸窒化物系蛍光体である請求項1に記載の半導体発光装置。
- 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ることを特徴とする請求項1に記載の半導体発光装置。 - 上記固溶体結晶は、Ceを6重量%以下の範囲で含有することを特徴とする請求項4に記載の半導体発光装置。
- 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2に記載の半導体発光装置。
- 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6に記載の半導体発光装置。
- 上記Eu賦活βサイアロンは、酸素濃度が0.1重量%~0.6重量%の範囲であることを特徴とする請求項7に記載の半導体発光装置。
- 上記Eu賦活βサイアロン蛍光体の600nmにおける吸収率が10%以下であることを特徴とする請求項8に記載の半導体発光装置。
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Also Published As
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EP2541630A1 (en) | 2013-01-02 |
JPWO2011105157A1 (ja) | 2013-06-20 |
JP5791034B2 (ja) | 2015-10-07 |
EP2541630A4 (en) | 2015-06-03 |
US8674392B2 (en) | 2014-03-18 |
US20120319155A1 (en) | 2012-12-20 |
EP2541630B1 (en) | 2017-05-31 |
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