Fluorescent lamp containing a green emitting rare earth silicate coactivated phosphor
US4208611A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1978 |
| Grant date | Jun 17, 1980 |
| Priority date | — |
| Expiry date | Apr 12, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/77742
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A rare earth silicate phosphor co-activated by cerium and terbium which is expressed by the general structural formula: EQU Ln.sub.2(1-x-y) O.sub.3.zSiO.sub.2 :Ce.sub.2x.Tb.sub.2y where: PA1 Ln is at least one rare earth element selected from the group consisting of yttrium, lanthanum, gadolinium and lutetium, PA1 x is 1.times.10.sup.-3 to 3.times.10.sup.-1 gram atom per gram atom of all the rare earth elements, PA1 y is 3.times.10.sup.-2 to 3.times.10.sup.-1 gram atom per gram atom of all the rare earth elements, PA1 z is 0.8 to 2.2 mol per mol of rare earth oxide, and the phosphor efficiently emits green rays when excited by ultraviolet rays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.