Protection film for improved phosphor maintenance and increased time-integrated light output
US4607191A · kind A · utility
13Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1984 |
| Grant date | Aug 19, 1986 |
| Priority date | — |
| Expiry date | Nov 13, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/48
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a fluorescent lamp having a phosphor coating, a maintenance improving and light output increasing film comprising yttrium oxide and at least one U.V. absorber is applied over the phosphor. The U.V. absorber is effective in the absorption of a greater amount of 185 nm radiation than 254 nm radiation from the plasma discharge. The film is most beneficial when applied over alkaline earth halophosphate phosphors at a film thickness of from about 50 angstroms to about 500 angstroms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.