Method for preparing small particle size fluoride up-converting phosphors
US5891361A · kind A · utility
13Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 2, 1997 |
| Grant date | Apr 6, 1999 |
| Priority date | — |
| Expiry date | May 2, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7772
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Spherical particles of fluoride up-converter phosphors having a particle size of 1 micron and less can be made from their corresponding precursor hydroxycarbonate particles by heating the hydroxycarbonate particles in an oxygen-containing atmosphere to convert the hydroxycarbonate to the corresponding oxide but without changing the size and shape of the particles, and then heating the phosphor oxide particles to their corresponding fluoride particles by heating in SF.sub.6, at a temperature that will crack the SF.sub.6 but will not change the size or shape of the phosphor particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.