Yellow green barium lanthanum silicate oxyapatite phosphor, a fl

Details Yellow green barium lanthanum silicate oxyapatite phosphor, a fl Yellow green barium lanthanum silicate oxyapatite phosphor, a fl

1986-12-18

1988-05-31

Cooper, Jack

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

2523014F, C09K 11477

Patent

active

047483911

ABSTRACT:
A method for preparing a barium lanthanum silicate oxyapatite europium activated phosphor and a barium lanthanum silicate oxyapatite manganese 2+ and europium 2+ or europium 2+ activated phosphor having a yellow green emission when activated by 254 nm excitation comprises the steps of forming a water slurry of the raw materials followed by calcining at approximately 1050.degree. C. to form a powder. The powder is then heated to approximately 1500.degree. C. in a reducing atmosphere to form the phosphor having a yellow green emission activated by a 254 nm excitation. Fluorescent lamps containing the yellow green emitting phosphors are described.

REFERENCES:
patent: 2297108 (1942-09-01), McKeag et al.
patent: 3505240 (1970-04-01), Barry
patent: 3650974 (1972-03-01), Ward
patent: 3676361 (1972-07-01), Datta
patent: 3790490 (1974-02-01), Datta et al.
Wanmaker et al., "J. of Solid State Chem.", 3, pp. 452-457, (1971).
Isaacs, "J. of Electrochem Soc.", vol. 120, No. 5, pp. 654-656, (1973).

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