Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
1980-10-20
1983-07-12
Hoffman, James R.
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
427 67, H01J 6148, B05D 138, B05D 722
Patent
active
043933300
ABSTRACT:
For fluorescent lamps which use a double layer of phosphor with manganese-activated zinc silicate phosphor in the overlying layer, a small predetermined amount of finely-divided antimony oxide is added to the first phosphor layer coating paint which, after application, is lehred at a temperature which is sufficient to volatilize the organic binder but which is insufficient to volatilize more than a minor proportion of the antimony oxide. Thereafter, the second phosphor layer coating paint which includes the zinc silicate is applied over the first-applied layer and the applied second layer coating paint is then lehred at a temperature which is sufficient to volatilize an appreciable portion of the residual antimony oxide in the first-applied layer to cause the volatilized antimony oxide to contact the zinc silicate.
REFERENCES:
patent: 2607014 (1952-08-01), Roy et al.
patent: 3348961 (1967-10-01), Ropp et al.
patent: 4088923 (1978-05-01), Manders
patent: 4305019 (1981-12-01), Graff et al.
Skwirut Henry
Young Robert G.
Hoffman James R.
North American Philips Electric Corp.
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