YMO4:Eu,L phoshpor with improved lumen maintenance
US6402987B1 · kind B1 · utility
26Cited by
5References
41Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1999 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Dec 1, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7796
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A Y(P,V)O4:Eu3+ red emitting phosphor is doped with at least one of a trivalent rare earth ion excluding Eu and a divalent metal ion to improve the lumen maintenance of the phosphor. The preferred material is the Y(P,V)O4:Eu3+ phosphor doped with trivalent Tb3+ ions and divalent Mg2+ ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.