Luminescent alkaline earth metal orthosilicate, luminescent scre

Details Luminescent alkaline earth metal orthosilicate, luminescent scre Luminescent alkaline earth metal orthosilicate, luminescent scre

1990-01-24

1990-10-16

Cooper, Jack

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

2523014F, 428690, C09K 1159

Patent

active

049637878

ABSTRACT:
Luminescent alkaline earth metal orthosilicate activated by praseodymium, defined by the formula M.sub.2-3/2x-1/2y Pr.sub.x M'.sub.y SiO.sub.4 in which M is at least one of the elements Ca and Sr of which up to 50 mol % may be replaced by Ba and/or of which up to 20 mol % may be replaced by Mg, in which M' is at least one of the elements Li, Na and K and in which 0.004.ltoreq.x.ltoreq.0.10 and 0.ltoreq.y.ltoreq.0.10.

REFERENCES:
patent: 3373302 (1968-03-01), Barber
patent: 3557014 (1971-01-01), Beals et al.
patent: 4215289 (1980-07-01), De Hair et al.
patent: 4495085 (1985-01-01), Hashimoto et al.
patent: 4539138 (1985-09-01), Miyahara et al.
Bondar et al., "Izvestia Akademia Nauk SSSR", vol. 33, No. 6, pp. 1057-1061, 1969.

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