Method of making europium activated yttrium oxide phosphor

Details Method of making europium activated yttrium oxide phosphor Method of making europium activated yttrium oxide phosphor

1989-10-10

1990-08-14

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

C09K 1178

Patent

active

049485270

ABSTRACT:
A europium activated yttrium oxide phosphor is prepared as follows. Europium oxide is dissolved in nitric acid. Ammonium hydroxide is added to precipitate europium hydroxide, which is then dissolved in citric acid monohydrate to form europium citrate solution. Yttrium oxide powder is added to the solution to form a slurry, which is then spray dried. The spray dried powder is fired at a high temperature to form the phosphor.

REFERENCES:
patent: 3870650 (1975-03-01), Ferri et al.
patent: 4191662 (1980-03-01), Mathers et al.

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