Method for producing cadmium free green emitting cathodoluminesc

Details Method for producing cadmium free green emitting cathodoluminesc Method for producing cadmium free green emitting cathodoluminesc

1976-07-06

1977-07-26

Cooper, Jack

Compositions

Inorganic luminescent compositions

Zinc or cadmium containing

313467, C09K 1130

Patent

active

040382052

ABSTRACT:
A green emitting ZnS : Cu, Al cathodoluminescent phosphor having x and y coordinate values of from 0.250 to 0.280 and 0.560 to 0.615 respectively, is produced by a critical firing schedule exemplified by slow heating to about 1000.degree. C, soaking at this temperature for about 1 hour, followed by slow cooling at about 3.degree. C per minute to 700.degree. C, followed by air quenching. The phosphor is useful for example, in tri-color television color television cathode ray tube.

REFERENCES:
patent: 2623858 (1952-12-01), Kroger
patent: 2743240 (1956-04-01), Froelich
patent: 3595804 (1971-07-01), Martin

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