Alkali metal alkaline earth metal sulfate phosphor activated wit

Details Alkali metal alkaline earth metal sulfate phosphor activated wit Alkali metal alkaline earth metal sulfate phosphor activated wit

1975-04-07

1977-02-08

Cooper, Jack

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

2523014S, 220 21R, C09K 1146, H01J 6144

Patent

active

040073947

ABSTRACT:
Mixed rare earth alkali and alkaline earth sulfates activated with cerium and terbium are used as a phosphor coating system for fluorescent lamps. The phosphor efficiently emits light in the green region and the emission spectrum of the phosphor demonstrates a prominent peak in the 520-560 nm region with minor inflections at other visible wavelengths.

REFERENCES:
patent: 3650976 (1972-03-01), Luckey
patent: 3764554 (1973-10-01), Schuil
patent: 3778615 (1973-12-01), Luckey
Blasse et al "J. Solid State Chem." 11, pp. 148-149, 1974.
Dixon et al "J. of Luminescence", 8, pp. 383-390, 1974.

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