Blue-emitting phosphor for use in fluorescent lamps and fluorescent lamp employing the same
US5350971A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 11, 1993 |
| Grant date | Sep 27, 1994 |
| Priority date | — |
| Expiry date | Jun 11, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/60
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A blue-emitting phosphor of europium-activated barium magnesium aluminate is used in a high color rendering three-band type fluorescent lamp, in which the particle size distribution is uniform to obtain excellent phosphor layer. A fluorescent lamp employing the blue-emitting phosphor mixed with red and green-emitting phosphors has a uniform emission luminance distribution and increased luminous flux intensity. The employed blue phosphor is expressed: EQU Ba.sub.a Mg.sub.b Al.sub.c La.sub.x O.sub.a+b+3(c+x)/2 :Eu.sub.d where 0.1.ltoreq.a.ltoreq.2.4, 0.1.ltoreq.b.ltoreq.5, 8.ltoreq.c.ltoreq.64, 0.001.ltoreq.x.ltoreq.0.2, and 0.1.ltoreq.d.ltoreq.4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.