Manganese activated alkaline earth tungstate phosphors and metho

Details Manganese activated alkaline earth tungstate phosphors and metho Manganese activated alkaline earth tungstate phosphors and metho

1977-06-09

1978-04-04

Cooper, Jack

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

2523015, C09K 1138

Patent

active

040826872

ABSTRACT:
Luminescent materials, having the formula, M.sub.(3+x) WO.sub.(6+x) : yMn wherein M is an alkaline earth metal selected from the group consisting of calcium, barium and strontium, x has a value of from 0 to about 0.4 and y has a value of from 0.00005 to about 0.05, emit light at a wave length of from about 650 to about 750 nanometers when excited by long wave length ultraviolet light. The above phosphors are prepared by heating the desired decomposable alkaline earth metal salt, a manganese source and tungsten trioxide in air and under controlled temperature conditions.

REFERENCES:
patent: 2203682 (1940-06-01), Foulke
patent: 2258472 (1941-10-01), Ruttenauer
patent: 3005125 (1961-10-01), Evans et al.
patent: 3940347 (1976-02-01), Fara et al.

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