Method of producing cerium-activated phosphor of improved charac

Details Method of producing cerium-activated phosphor of improved charac Method of producing cerium-activated phosphor of improved charac

1977-11-10

1979-02-27

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

C09K 1146

Patent

active

041418557

ABSTRACT:
A phosphor expressed fundamentally as YA10.sub.3 :Ce is produced through baking under a usual condition of a mixture of Y.sub.2 O.sub.3, Al.sub.2 O.sub.3, CeO.sub.2 and a controlled amount of barium compound exemplified by BaCO.sub.3, BaO, Ba(OH).sub.2 and BaF.sub.2. The presence of the barium compound in the mixture causes intensification of ultraviolet emission and/or suppression of the formation of blue-emitting Y.sub.3 Al.sub.5 O.sub.12 :Ce. The use of BaF.sub.2 as the barium compound or partial replacement of at least one of Y.sub.2 O.sub.3 and Al.sub.2 O.sub.3 respectively by YF.sub.3 and AlF.sub.3 is favorable to the intensification of the ultraviolet emission.

REFERENCES:
patent: 2590411 (1952-03-01), Isenberg
patent: 3657138 (1972-04-01), Royce

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