Fluorescent lamp processing which improves performance of zinc silicate phosphor used therein
US4363998A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1981 |
| Grant date | Dec 14, 1982 |
| Priority date | — |
| Expiry date | May 19, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Fluorescent lamp incorporates tin oxide conductive coating on the envelope interior surface and the lamp also incorporates phosphor means comprising manganese-activated zinc silicate phosphor, which may be used as a blend constituent. The lamp is processed in such a manner as to improve the performance of the zinc silicate phosphor. In order to improve the adherence of the phosphor to the tin oxide conductive coating, the tin oxide is overcoated with a film of sub-micron-size aluminum oxide and, in accordance with the present processing, there is included with the aluminum oxide finely divided antimony oxide. The phosphor is then overcoated onto the mixed film of aluminum oxide and antimony oxide, and during the later lehring processing of the coated phosphor, the antimony oxide is volatilized to contact the zinc silicate phosphor to improve the performance thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.