Luminescent lead-activated alkaline earth metal rare earth metal

Details Luminescent lead-activated alkaline earth metal rare earth metal Luminescent lead-activated alkaline earth metal rare earth metal

1979-04-18

1980-11-11

Cooper, Jack

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

2523014R, C09K 1146

Patent

active

042335388

ABSTRACT:
Luminescent lead-activated alkaline earth metal rare earth metal borates having compositions defined by the formula Me.sub.1-p Pb.sub.p La.sub.1-x-y Y.sub.x Gd.sub.y BO.sub.4, where Me represents strontium and/or calcium, where 0.005 .ltoreq.p.ltoreq.0.30 and 0.ltoreq.x.ltoreq.0.1, and where O.ltoreq.y.ltoreq.0.5 when at least 75 mole% of Me is Ca and O.ltoreq.y.ltoreq.0.1 when less than 75 mole% of Me is Ca. The borate may be used in the luminescent screen of low-pressure mercury vapor discharge lamps.

REFERENCES:
patent: 2270124 (1942-01-01), Huniger et al.
patent: 2920046 (1960-01-01), Ranby
patent: 3423325 (1969-01-01), Wanmaker et al.

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