Silicon sensitized rare earth oxysulfide phosphors

Details Silicon sensitized rare earth oxysulfide phosphors Silicon sensitized rare earth oxysulfide phosphors

1975-04-11

1976-09-14

Borchelt, Archie R.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

2523014S, G01T 100

Patent

active

039808874

ABSTRACT:
Rare earth oxysulfide phosphors with excellent optical properties and optimum particle size control for use as photoluminescent, cathodoluminescent and X-ray luminescent phosphors 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: 3738856 (1973-06-01), Masi
patent: 3829700 (1974-08-01), Buchanan et al.
patent: 3872309 (1975-03-01), DeBelder et al.

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