Cerium/lanthanum/terbium mixed phosphates
US5340556A · kind A · utility
24Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1992 |
| Grant date | Aug 23, 1994 |
| Priority date | — |
| Expiry date | Feb 4, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7777
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Novel cerium/lanthanum/terbium (LaCeTb) mixed phosphates, especially useful in luminescence for the production of green phosphors, have the formula (I): EQU La.sub.x Ce.sub.y Tb.sub.1-x-y PO.sub.4 in which x ranges from 0.4 to 0.6 and x+y is greater than 0.8, display a lightness (L*) of greater than 98% after calcination at a temperature above 700.degree. C. in air, and the cerium (IV) and/or terbium (IV) contents of which are very low, even after calcination in air at a temperature above 500.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.