Barium fluorochloride x-ray phosphors and method of preparing same
US3951848A · kind A · utility
8Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1975 |
| Grant date | Apr 20, 1976 |
| Priority date | — |
| Expiry date | Apr 28, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7733
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An x-ray luminescent phosphor composition consists essentially of a europium activated barium fluorochloride and an effective amount of brightness enhancement additive selected from lead, thallium and aluminum ions. The compositions are prepared by a solid state process in which a barium chloride and barium fluoride and a europium source are heated together in a non-oxidizing atmosphere with a source of lead or thallium or aluminum hydroxide. The temperatures utilized are from about 750.degree. to 925.degree.C for from about 1 to about 24 hours.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.