Fluorescent lamp and method for the manufacture thereof

Details Fluorescent lamp and method for the manufacture thereof Fluorescent lamp and method for the manufacture thereof

1974-10-23

1976-06-15

Mack, John H.

Compositions

Inorganic luminescent compositions with organic...

427 67, 427157, C09K 1108

Patent

active

039636399

ABSTRACT:
A fluorescent lamp having a phosphor coating on the inside surface of the tubular glass envelope, the phosphor coating comprising finely divided phosphor particles coated with a glassy phosphate material. The lamp is prepared by providing an aqueous slurry of the phosphor particles in a solution containing a material yielding a phosphate glass upon firing, coating the interior envelope walls with the aqueous suspension, and firing the phosphor coating at a temperature which promotes the formation of the phosphate glass coating about the particulate phosphor material. A suitable phosphate glass-yielding material is ammonium dihydrogen phosphate, and phosphor coatings produced therewith have been found to have improved adherence to the envelope walls.

REFERENCES:
patent: 3055767 (1962-09-01), Quirk
patent: 3310418 (1967-03-01), Friedman et al.
patent: 3424605 (1969-01-01), Beaumont et al.
patent: 3551180 (1970-12-01), Margolis

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