Pre-water-based suspension phosphor treatment process

Details Pre-water-based suspension phosphor treatment process Pre-water-based suspension phosphor treatment process

1987-02-02

1989-02-07

Moore, David K.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

427 67, 427215, 313485, H01J 6304

Patent

active

048034002

ABSTRACT:
A method for eliminating carbonaceous contaminants and preventing the hydration/solubilization of the oxide coating of a phosphor is described. The method involves the annealing of the oxide coated phosphor at a temperature and for a period sufficient to preclude adversely affecting the protective oxide coating on the phosphor during subsequent water-based suspension processing without detrimentally altering the phosphor. After annealing the phosphor is cooled and then added to a water-based suspension. The optimum conditions for annealing a manganese activated zinc silicate phosphor or a calcium halophosphate phosphor having a protective aluminum oxide coating are the combination of a temperature between about 700.degree. C. and about 850.degree. C. and for a period of time from about 15 minutes to about 20 hours.

REFERENCES:
patent: 3249788 (1966-05-01), Wainio et al.
patent: 3310418 (1967-03-01), Friedman et al.
patent: 3833398 (1974-09-01), Schreurs
patent: 4396863 (1983-08-01), Ranby et al.
patent: 4585673 (1986-04-01), Sigai

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