Yellow-emitting halophosphate phosphor of improved brightness an

Details Yellow-emitting halophosphate phosphor of improved brightness an Yellow-emitting halophosphate phosphor of improved brightness an

1982-10-21

1984-05-01

Cooper, Jack

Compositions

Inorganic luminescent compositions

Zinc or cadmium containing

2523014H, 2523014P, C09K 11435

Patent

active

044460490

ABSTRACT:
Phosphors and a method for producing yellow-emitting tin-manganese coactivated calcium fluorophosphate phosphors having improved brightness comprises the steps of blending a powder mixture including the phosphates, carbonates, fluorides and oxides of calcium, tin, and manganese together with an ammonium salt, and firing the mixture at a temperature of between about 1100.degree. C. and about 1300.degree. C. for a period sufficient to produce a luminescent composition. The presence of an ammonium compound in the initial powder blend promotes the proper atmosphere during the firing step to insure the incorporation of proper levels of tin and manganese ions in the final phosphor.

REFERENCES:
patent: 2476654 (1949-07-01), Froelich
patent: 2579900 (1951-12-01), Butler
patent: 2619471 (1952-11-01), Butler
patent: 2664401 (1953-12-01), McKeag et al.
patent: 2965786 (1960-12-01), Aia et al.
patent: 3198742 (1965-08-01), Ropp

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