Ce,Pr-coactivated yttrium phosphate phosphor and lamp containing same
US7497974B2 · kind B2 · utility
4Cited by
9References
6Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 1, 2006 |
| Grant date | Mar 3, 2009 |
| Priority date | — |
| Expiry date | May 11, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The sensitivity of YPO4:Ce phosphors to 185 nm radiation may be increased by incorporating a praseodymium coactivator. The use of Ce and Pr as co-activators in a YPO4 phosphor improves the sensitivity of the phosphor to excitation by both 185 nm and 254 nm radiation and should increase total UVA and UVB output in fluorescent lamps. The co-activated phosphor has emission peaks at about 355 nm and about 335 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.