Method of preparing stoichiometric zinc silicate phosphor with i

Details Method of preparing stoichiometric zinc silicate phosphor with i Method of preparing stoichiometric zinc silicate phosphor with i

1981-03-11

1983-06-28

Cooper, Jack

Compositions

Inorganic luminescent compositions

Zinc or cadmium containing

C09K 1144

Patent

active

043904491

ABSTRACT:
Manganese-arsenic coactivated zinc silicate phosphors comprising a host of substantially stoichiometric zinc silicate and characterized by enhanced brightness and persistence are prepared by a method which includes a two-step firing schedule. The initial pre-fired phosphor powder blend is formulated with an amount of silicic acid less than or equal to the amount stoichiometrically required for the formation of zinc silicate. Any excess zinc oxide remaining in the mixture following the first firing step is removed by addition of ammonium chloride and a second firing step. The resulting phosphors are substantially free of inert zinc oxide and silica which would otherwise contribute to diminished brightness and persistence.

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Von K.-Th. Wilke, "Zeitschrift fur Physikalische Chemie", vol. 224, pp. 51-56, (1963).
Froelich et al., "J. Phys. Chem.", 46, pp. 878-885, (1942).

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