Luminescent materials
US4446048A · kind A · utility
4Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1981 |
| Grant date | May 1, 1984 |
| Priority date | — |
| Expiry date | Nov 23, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A phosphor for use in fluorescent lamps which comprises calcium sulphate and, optionally, up to 50% of strontium sulphate together with cerium (0.5-10%), manganese (up to 10%), an alkali metal (0.001 to 3%) and boron and/or aluminium (0.001 to 8%). The phosphor may be produced by blending and then firing the individual components. Tubes for use in the lamps may be electrostatically coated with the phosphor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.