White light emitting device and vehicle lamp using the same
AssigneeKoito Manufacturing Co., Ltd.
InventorsHisayoshi Daicho, Masanobu Mizuno, Hajime Yamamoto, Yoshinobu Miyamoto, Bonggoo Yun
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Abstract
A white light emitting device includes a semiconductor light emitting element that has a peak of an emission spectrum in a range of 370 nm to 480 nm, and at least one kind of phosphor that is excited by light emitted from the semiconductor light emitting element to emit visible light. The phosphor is represented by the formula: Sr1-x-yBaxSi2O2N2:Eu2+y, wherein x is in the range of 0.3<x<1.0, y is in the range of 0.03<y<0.3, and x+y is in the range of x+y<1.0, and a vehicle lamp using the while light emitting device.
Claims18
A white light emitting device for a vehicle lamp, the white light emitting device comprising:
- a semiconductor light emitting element that has a peak of an emission spectrum in a range of 370 nm to 480 nm;
- and
- at least one kind of phosphor that is excited by light emitted from the semiconductor light emitting element to emit visible light, wherein the phosphor is represented by the formula:
- Sr1-x-yBaxSi2O2N2:Eu2+y
- wherein x is in the range of 0.3<x<1.0, y is in the range of 0.03<y<0.3, and x+y is in the range of x+y<1.0.
Dependencies are inferred from the claim text.