Process for producing Ce-Mn coactivated fluoroapatite phosphors as the yellow emitting component for high efficacy lamp blends
US4647399A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1986 |
| Grant date | Mar 3, 1987 |
| Priority date | — |
| Expiry date | Apr 30, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7725
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Yellow emitting fluorescent lamp phosphor compositions comprise cerium and manganese activated alkali-earth fluoroapatite compositions containing sodium having the approximate formula EQU (Ca.sub.1-s Sr.sub.s).sub.t Ce.sub.v Na.sub.w Mn.sub.x (PO.sub.4).sub.y F.sub.z wherein PA1 s is from 0 to 1 PA1 t is from about 3.43 to about 4.01 PA1 v is about 0.3 PA1 w is about 0.3 PA1 x is from about 0.3 to about 0.4 PA1 y is about 3.00 PA1 z is from about 1.0 to about 4.0. 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.