A method of coating a layer of an yttrium vanadate phosphor contained in a fluorescent lamp with Y.sub.2 O.sub.3 or Al.sub.2 O.sub.3 and lamps made therefrom
US4952422A · kind A · utility
16Cited by
11References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1988 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Feb 29, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7794
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A fluorescent lamp containing a Y.sub.2 O.sub.3 or Al.sub.2 O.sub.3 coating on a layer of yttrium vanadate phosphor and a method of coating the layer of the yttrium vanadate phosphor with a continuous protective coating of Y.sub.2 O.sub.3 or Al.sub.2 O.sub.3 is described. The method comprises applying a coating of a metal, such as yttrium or aluminum, on the yttrium vanadate phosphor then lehring the metallic coating at about 500.degree. C. to about 625.degree. C. to form a continuous protective coating of Y.sub.2 O.sub.3 or Al.sub.2 O.sub.3 overlaying the layer of phosphor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.