Cathode ray tube containing silicon sensitized rare earth oxysul

Details Cathode ray tube containing silicon sensitized rare earth oxysul Cathode ray tube containing silicon sensitized rare earth oxysul

1975-04-11

1976-04-13

Cooper, Jack

Electric lamp and discharge devices

Cathode ray tube

Screen

H01J 2920

Patent

active

039506681

ABSTRACT:
Rare earth oxysulfide phosphors with excellent optical properties and optimum particle size control for use as cathodo-luminescent phosphors in cathode ray tubes are prepared by treating a solution of at least one salt of a rare earth metal and a salt of a rare earth activator to form solid salts and thereafter heating the oxidic compound with a sulfidizing agent and a silicon sensitizer, preferably in the presence of a fluoride. The rare earth oxysulfide phosphors thus obtained contain from 10 to 1,000 p.p.m. silicon sensitizer and, if used, 20 to 500 p.p.m. fluoride, incorporated in the crystal lattice structure.

REFERENCES:
patent: 2522074 (1950-09-01), Urbach
patent: 2567769 (1951-09-01), Head
patent: 3418246 (1968-12-01), Royce
patent: 3458451 (1969-07-01), Kobayashi et al.
patent: 3791844 (1974-02-01), Tecotzky et al.
patent: 3878119 (1975-04-01), Nath

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