Aluminum oxide reflector layer for fluorescent lamps

Details Aluminum oxide reflector layer for fluorescent lamps Aluminum oxide reflector layer for fluorescent lamps

1986-11-12

1990-05-08

Weider, Kenneth

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313489, 313113, H01J 6135

Patent

active

049241419

ABSTRACT:
An improved fluorescent lamp is disclosed. The lamp of the present invention includes an envelope containing an ionizable medium including mercury and having electrodes located within the envelope; an aluminum oxide reflector layer on the inner surface of the envelope, and a phosphor layer disposed on the reflector layer. The aluminum oxide reflector layer comprises particles of high purity aluminum oxide having an average particle size greater than 0.5 micrometer and less than or equal to about 1 micrometer and having a surface area of about 4 to 6 meter.sup.2 /gram. The aluminum oxide reflector layer preferably includes at least 95 weight percent alpha-alumina. Preferred coating weights for the reflector layer are from about 8.8 to about 11.1 milligram/square centimeter.

REFERENCES:
patent: 3141990 (1964-07-01), Ray
patent: 3717781 (1973-02-01), Sadoski et al.
patent: 4012655 (1977-03-01), McVey et al.

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