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AssigneesStanley Electric Co., Ltd., Denki Kagaku Kogyo Kabushiki Kaisha
InventorsYasuyuki Miyake, Shuichi Taya, Akifumi Ochiai, Hideyuki Emoto, Masahiro Ibukiyama
Estimating the term…
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. 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.
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:
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:
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).
Dependencies are inferred from the claim text.