Pre-water-based suspension phosphor treatment process

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

H - Electricity

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H01J 63/04 (2006.01) C09K 11/02 (2006.01) C09K 11/08 (2006.01) C09K 11/59 (2006.01) C09K 11/76 (2006.01) H01J 61/44 (2006.01) H01J 61/46 (2006.01)

Patent

CA 1337674

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 tempera- ture 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 tempera- ture between about 700°C and about 850°C and for a period of time from about 15 minutes to about 20 hours.

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