Process for producing a yellow emitting phosphor
US4594178A · kind A · utility
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2Claims
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Assignee
Inventors
Key dates
| Filing date | Mar 18, 1985 |
| Grant date | Jun 10, 1986 |
| Priority date | — |
| Expiry date | Mar 18, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Yellow emitting fluorescent lamp phosphors comprise cerium and manganese activated calcium-strontium fluoroapatite compositions represented by the approximate formula EQU (Ca.sub.1-t Sr.sub.t).sub.v Ce.sub.w Mn.sub.x (PO.sub.4).sub.y F.sub.z wherein PA0 t is from 0 to 1 PA0 v is from about 4.12 to about 4.30 PA0 w is about 0.295 PA0 x is from about 0.147 to about 0.295 PA0 y is about 3.0 PA0 z is from about 1.72 to about 2.21. An improved two step firing process for producing the disclosed phosphors is described and an improved fluorescent lamp employing the disclosed phosphors is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.