Single-component, UV-emitting phosphor
US7238302B2 · kind B2 · utility
2Cited by
2References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2004 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Sep 8, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7777
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention is a single-component, UV-emitting phosphor having a composition represented by the general formula (Y1−x−y−zLaxGdyCeZ)PO4 where x has a value in a range from 0.001 to 0.98, y has a value in a range from 0 and 0.1, z has a value in a range from 0.01 and 0.2, and x+y+z<1. The phosphor when stimulated by 254 nm radiation emits in both the UVA and UVB regions. The relative balance of the UVA and UVB emissions may be varied by adjusting the relative amounts of Y and La. Brightness can be increased by adding Gd to the composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.