Method of making lanthanum cerium terbium gadolinium phosphate p

Details Method of making lanthanum cerium terbium gadolinium phosphate p Method of making lanthanum cerium terbium gadolinium phosphate p

1991-11-18

1992-10-13

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

C09K 1181

Patent

active

051548526

ABSTRACT:
A lanthanum cerium terbium gadolinium phosphate phosphor has the composition La.sub.1-x-y-z Ce.sub.x Tb.sub.y Gd.sub.z PO.sub.4, where x=0.2 to 0.45, y=0.127 to 0.137, and z=0.001 to 0.1. The phosphor has improved brightness and/or maintenance over a lanthanum cerium terbium phosphate phosphor without gadolinium. The phosphor can be prepared by reacting a lanthanum cerium terbium gadolinium oxide with boron phosphate in the presence of a flux forming compound containing lithium in an inert or reducing atmosphere.

REFERENCES:
patent: 4127415 (1978-11-01), Quackenbush et al.
patent: 4266137 (1981-05-01), Shaffer

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