Barium fluorochloride x-ray phosphors and method of preparing sa

Details Barium fluorochloride x-ray phosphors and method of preparing sa Barium fluorochloride x-ray phosphors and method of preparing sa

1975-04-28

1976-04-20

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

C09K 1146

Patent

active

039518485

ABSTRACT:
An x-ray luminescent phosphor composition consists essentially of a europium activated barium fluorochloride and an effective amount of brightness enhancement additive selected from lead, thallium and aluminum ions. The compositions are prepared by a solid state process in which a barium chloride and barium fluoride and a europium source are heated together in a non-oxidizing atmosphere with a source of lead or thallium or aluminum hydroxide. The temperatures utilized are from about 750.degree. to 925.degree.C for from about 1 to about 24 hours.

REFERENCES:
patent: 2303963 (1942-12-01), Uhle
patent: 3163610 (1964-12-01), Yocum
patent: 3448056 (1969-06-01), Chenot
patent: 3630945 (1971-12-01), Hoffman
patent: 3702828 (1972-11-01), Hoffman
Sommerdijk et al. "Journal of Luminescence," 1974, 8(6) pp. 502-506.

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