Rare-earth-activated phosphors
US6783855B1 · kind B1 · utility
15Cited by
9References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2001 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Sep 14, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2991
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for preparing phosphor particles of a host oxide doped with a rare earth or manganese which comprises:preparing an aqueous solution of salts of the host ion and of the dopant ion and a water soluble compound which decomposes under the reaction conditions to convert said salts into hydroxycarbonate,heating the solution so as to cause said compound to decompose,recovering the resulting precipitate andcalcining it at a temperature of at least 500° C.Substantially monocrystalline particles can be obtained by this process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.