White light emitting device and vehicle lamp using the same
US8299487B2 · kind B2 · utility
2Cited by
0References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2009 |
| Grant date | Oct 30, 2012 |
| Priority date | — |
| Expiry date | Nov 26, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.