Compositions – Inorganic luminescent compositions – Zinc or cadmium containing
Patent
1991-12-09
1992-09-29
Cooper, Jack
Compositions
Inorganic luminescent compositions
Zinc or cadmium containing
427 64, 427 67, 427213, 427215, 4273722, C09K 1159
Patent
active
051512157
ABSTRACT:
A method for eliminating carbonaceous contaminants and preventing the hydration/solubilization of the alumina protective coating of a phosphor is described. The method involves the heating a fluidized alumina coated phosphor in a fluidized bed at a temperature and for a period of time sufficient to preclude adversely affecting the protective oxide coating on the phosphor during subsequent water-based suspension processing without detrimentally altering the phosphor. After heating the fluidized phosphor is cooled and then added to a water-based suspension. The conditions for treating a manganese activated zinc silicate phosphor having a protective alumina coating are heating the fluidized phosphor at a temperature between about 700.degree. C. and about 850.degree. C. for a period of time from about 15 minutes to about 20 hours.
A fluorescent lamp containing the phosphor prepared by the above described method is also described.
REFERENCES:
patent: 4585673 (1986-04-01), Sigai
patent: 4710674 (1987-12-01), Sigai
patent: 4803400 (1989-02-01), Peters et al.
patent: 4806389 (1989-02-01), Peters et al.
Cooper Jack
Craig Frances P.
GTE Products Corporation
Ruoff Carl F.
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