Fluorescent lamp with a low reflectivity protective film of alum

Details Fluorescent lamp with a low reflectivity protective film of alum Fluorescent lamp with a low reflectivity protective film of alum

1977-09-06

1981-09-15

Demeo, Palmer C.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313493, 313221, 313492, H01J 6135, H01J 6142

Patent

active

042899915

ABSTRACT:
The light output and lumen maintenance of fluorescent lamps with or without a conductive film, are improved by coating the glass envelope or the conductive glass envelope with a thin transparent film of Al.sub.2 O.sub.3.
The alumina film is obtained from a coating of a binderless suspension of submicron size Al.sub.2 O.sub.3 particles in lightly acidified water and has a thickness of 20 to 80 nanometers.

REFERENCES:
patent: 3624444 (1971-11-01), Berthold et al.
patent: 3717781 (1973-02-01), Sadoski et al.
patent: 3967153 (1976-06-01), Milke et al.

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