Red emitting phosphor with slow exponential decay
US4307321A · kind A · utility
4Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1980 |
| Grant date | Dec 22, 1981 |
| Priority date | — |
| Expiry date | Mar 31, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7724
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A luminescent phosphor composition having enhanced luminescent decay lifetime consists essentially of a non-stoichiometric cerium and manganese coactivated alkaline earth orthophosphate represented by the formula EQU Sr.sub.(3-v-w-x-y-z) .quadrature..sub.v Mg.sub.w CA.sub.x (PO.sub.4).sub.2 :Ce.sub.y Mn.sub.z where PA0 0.001.ltoreq.v.ltoreq.0.05 PA0 0.180.ltoreq.w.ltoreq.0.35 PA0 0.ltoreq.x.ltoreq.0.08 PA0 0.015.ltoreq.y.ltoreq.0.05 PA0 0.01.ltoreq.z.ltoreq.0.10. An improved fluorescent lamp employing the disclosed phosphor is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.