Cool white lamp using a two-component phosphor

Details Cool white lamp using a two-component phosphor Cool white lamp using a two-component phosphor

1979-06-22

1981-05-05

Demeo, Palmer C.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

2523014P, C09K 1112, C09K 1124, C09K 1142, H01J 6144

Patent

active

042661617

ABSTRACT:
A fluorescent lamps having chromaticity coordinates similar to cool white can be prepared using two component compositions. A blue emitting strontium-barium chlorapatite activated with europium and a yellow emitting calcium-strontium fluorapatite applied as a blend or as two distinct layers yields a lamp equivalent in chromaticity to a standard cool white lamp with a higher lumer per watt than the standard cool white lamp.

REFERENCES:
patent: 2488733 (1949-11-01), McKeag et al.
patent: 2965786 (1960-12-01), Aia et al.
patent: 3513103 (1970-05-01), Shaffer
patent: 3549552 (1970-12-01), Van Broekhoven
patent: 3670194 (1972-06-01), Thornton, Jr. et al.
patent: 4038204 (1977-07-01), Wachtel
patent: 4075532 (1978-02-01), Piper et al.
"Optimum Phosphor Blends for Fluorescent Lamps", by W. Walter, Applied Optics, vol. 10, No. 5, May 1971, pp. 1108-1113.

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