Fluorescent discharge lamp having luminescent material of a spec

Details Fluorescent discharge lamp having luminescent material of a spec Fluorescent discharge lamp having luminescent material of a spec

1978-02-28

1979-08-28

Demeo, Palmer C.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

H01J 6144

Patent

active

041662342

ABSTRACT:
A low-pressure mercury vapor discharge lamp provided with a luminescent Eu-activated rare earth oxide, a luminescent aluminate with hexagonal crystal structure activated by Ce or by Ce and Tb, or a luminescent aluminate with hexagonal crystal structure activated by Eu or by Eu and Mn. Not more than 5% by weight of the luminescent material has a grain size smaller than 1 .mu.m and the maximum of the grain size distribution curve is located in the range from 2 to 8 .mu.m.

REFERENCES:
patent: 2103032 (1937-12-01), Fritze et al.
patent: 2962616 (1960-11-01), Homer et al.
patent: 3023340 (1962-02-01), Repsher
patent: 3255373 (1966-06-01), Broekhoven et al.
patent: 3833827 (1974-09-01), Shaffer
patent: 3875453 (1975-04-01), Thornton, Jr.
patent: 3937998 (1976-02-01), Verstegen et al.
patent: 3992645 (1976-11-01), Kaduk
"Fluorescent Lamps and Lighting," by W. Elenbaas, 1962, Section 2.4 Preparation of Phosphors, pp. 23, 24, 25.

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