Method for preparing sulfide phosphors

Details Method for preparing sulfide phosphors Method for preparing sulfide phosphors

1990-03-21

1992-04-07

Straub, Gary P.

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

423444, 4235661, 2523016S, C01B 1700, C09K 1100

Patent

active

051025795

ABSTRACT:
A method for preparing a sulfide phosphor where a raw material mixture for a sulfide phosphor is placed in an almost closed first heat-resistant container and fired therein, the method being characterized in that an auxiliary material composed of carbon and/or a carbon-forming compound capable of being pyrolyzed at a temperature not higher than the firing temperature to form carbon, and a metal sulfide capable of recting with the carbon and/or said carbon-forming compound at a temperature not lower than 600.degree. C. but not higher than the firing temperature to form a carbon sulfide is placed in the portion as physically separated from the raw material mixture for the sulfide phosphor in the said first heat-resistant container and the firing is conducted under such condition so that said first heat-resistant container may have a carbon sulfide atmosphere by the thermal reaction of the thus fired auxiliary materials.

REFERENCES:
patent: 2573817 (1949-04-01), Thomsen
patent: 3957678 (1976-05-01), Dikhoff et al.

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