Yellow green barium lanthanum silicate oxyapatite phosphor, a fluorescent lamp containing the same, and a method thereof
US4748391A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1986 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Dec 18, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/77922
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for preparing a barium lanthanum silicate oxyapatite europium activated phosphor and a barium lanthanum silicate oxyapatite manganese 2+ and europium 2+ or europium 2+ activated phosphor having a yellow green emission when activated by 254 nm excitation comprises the steps of forming a water slurry of the raw materials followed by calcining at approximately 1050.degree. C. to form a powder. The powder is then heated to approximately 1500.degree. C. in a reducing atmosphere to form the phosphor having a yellow green emission activated by a 254 nm excitation. Fluorescent lamps containing the yellow green emitting phosphors are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.