Phosphors with improved lumen output and lamps made therefrom
US5113118A · kind A · utility
6Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1991 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Mar 11, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/48
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A phosphor having a continuous protective bi-layer coating of alumina surrounding silica surrounding the phosphor particles is disclosed. The method of making a bi-layer coating on phosphor particles is also disclosed. The first layer surrounding the phosphor is silica. The second layer surrounding the phosphor is alumina. The bi-layer phosphor is useful in fluorescent lamps providing improved maintenance and brightness. The bi-layer phosphor can also be used in high color rendition lamps employing blends of phosphors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.