Light-emitting device, vehicular lighting fixture comprising the device, and head lamp
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F21V-007/00
H01J-001/62
출원번호
US-0682076
(2008-10-15)
등록번호
US-8274208
(2012-09-25)
우선권정보
JP-2007-269970 (2007-10-17)
국제출원번호
PCT/JP2008/068667
(2008-10-15)
§371/§102 date
20100408
(20100408)
국제공개번호
WO2009/051137
(2009-04-23)
발명자
/ 주소
Miyake, Yasuyuki
Taya, Shuichi
Ochiai, Akifumi
Emoto, Hideyuki
Ibukiyama, Masahiro
출원인 / 주소
Stanley Electric Co., Ltd.
대리인 / 주소
Stein McEwen, LLP
인용정보
피인용 횟수 :
3인용 특허 :
0
초록▼
A light-emitting device comprising a light source which emits excitation light and a fluorescent substance which absorbs the excitation light to emit light in combination, wherein a fluorescent substance comprising an α type SiAlON represented by the general formula: (Caα,Euβ)(Si,Al)12(O,N)16 (1.5α+
A light-emitting device comprising a light source which emits excitation light and a fluorescent substance which absorbs the excitation light to emit light in combination, wherein a fluorescent substance comprising an α type SiAlON represented by the general formula: (Caα,Euβ)(Si,Al)12(O,N)16 (1.5α+β2.2, 0β0.2, O/N≦0.04) as a main component and having a specific surface area of 0.1 to 0.35 m2/g is used as the fluorescent substance. This light-emitting device shows little color change due to temperature change and efficiently emits light, even when it is used in a high temperature environment, and it is especially suitable for lighting apparatuses for vehicles such as headlamps.
대표청구항▼
1. A light-emitting device comprising a light source which emits excitation light and a fluorescent substance which absorbs the excitation light to emit light in combination, wherein a fluorescent substance comprising an α type SiAlON represented by the general formula: (Caα,Euβ)(Si,Al)12(O,N)16 (1.
1. A light-emitting device comprising a light source which emits excitation light and a fluorescent substance which absorbs the excitation light to emit light in combination, wherein a fluorescent substance comprising an α type SiAlON represented by the general formula: (Caα,Euβ)(Si,Al)12(O,N)16 (1.5<α+β<2.2, 0<β<0.2, O/N≦0.04) as a main component is used as the fluorescent substance. 2. The light-emitting device according to claim 1, wherein chromaticity of light emitted by the light-emitting device is in the range defined as x≧0.545, y≧0.39, and y≦x−0.12 in terms of the chromaticity coordinates (CIE 1931). 3. The light-emitting device according to claim 1, wherein the excitation light emitted by the light source has an emission peak wavelength of 420 to 480 nm. 4. The light-emitting device according to claim 1, wherein area of a region of 500 nm or shorter in an emission spectrum of the light-emitting device consists of 5% or less of the total area of the emission spectrum. 5. The light-emitting device according to claim 1, wherein the main peak in the emission spectrum of the light-emitting device has a full width at half maximum of 100 nm or smaller. 6. A lighting apparatus for vehicles, which uses the light-emitting device according to claim 1. 7. A headlamp comprising the lighting apparatus according to claim 6. 8. Alighting apparatus for vehicles comprising a light-emitting element, a reflector for receiving and reflecting light from the light-emitting element, and a lens for irradiating the light reflected by the reflector to the outside, wherein the light-emitting device according to claim 1 is used as the light-emitting element. 9. The lighting apparatus for vehicles according to claim 8, wherein area of a region of 500 nm or shorter in an emission spectrum measured without using a color filter consists of 5% or less of the total area of the emission spectrum. 10. The lighting apparatus for vehicles according to claim 8, wherein the main light-emitting direction of the light-emitting element is substantially perpendicular to the main light-emitting direction of the lighting apparatus. 11. A light-emitting device comprising a light source which emits excitation light and a fluorescent substance which absorbs the excitation light to emit light in combination, wherein a fluorescent substance comprising an α type SiAlON represented by the general formula: (Caα,Euβ)(Si,Al)12(O,N)16 (1.5<α+β<2.2, 0<β<0.2, O/N≦0.04) as a main component and having a specific surface area of 0.1 to 0.35 m2/g is used as the fluorescent substance. 12. The light-emitting device according to claim 11, wherein chromaticity of light emitted by the light-emitting device is in the range defined as x≧0.545, y≧0.39, and y≦x−0.12 in terms of the chromaticity coordinates (CIE 1931). 13. The light-emitting device according to claim 11, wherein the excitation light emitted by the light source has an emission peak wavelength of 420 to 480 nm. 14. The light-emitting device according to claim 11, wherein area of a region of 500 nm or shorter in an emission spectrum of the light-emitting device consists of 5% or less of the total area of the emission spectrum. 15. The light-emitting device according to claim 11, wherein the main peak in the emission spectrum of the light-emitting device has a full width at half maximum of 100 nm or smaller. 16. A lighting apparatus for vehicles, which uses the light-emitting device according to claim 11. 17. A lighting apparatus for vehicles comprising a light-emitting element, a reflector for receiving and reflecting light from the light-emitting element, and a lens for irradiating the light reflected by the reflector to the outside, wherein the light-emitting device according to claim 11 is used as the light-emitting element. 18. A light-emitting device comprising a light source which emits excitation light and a fluorescent substance which absorbs the excitation light to emit light in combination, wherein at an environmental temperature in the range of −20° C. to 85° C., change of the total luminous flux is ±30% or smaller, and chromaticity of the emitted light is in the range defined as x≧0.545, y≧0.39, and y≦x−0.12 in terms of the chromaticity coordinates (CIE 1931). 19. The light-emitting device according to claim 18, wherein at an environmental temperature in the range of −20° C. to 85° C., chromaticity change amount satisfies Δx≦0.03 and Δy≦0.03 in terms of change of the chromaticity coordinates (CIE 1931). 20. A lighting apparatus for vehicles, which uses the light-emitting device according to claim 18. 21. A lighting apparatus for vehicles comprising a light-emitting element, a reflector for receiving and reflecting light from the light-emitting element, and a lens for irradiating the light reflected by the reflector to the outside, wherein the light-emitting device according to claim 18 is used as the light-emitting element.
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