Long persistence red phosphors

Details Long persistence red phosphors Long persistence red phosphors

1998-06-16

2000-06-06

Koslow, C. Melissa

Compositions

Inorganic luminescent compositions

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

2523014R, C09K 1155, C09K 1156

Patent

active

060714328

ABSTRACT:
Red and orange-red emitting long persistence phosphors based on strontium sulfide and activated with a divalent rare earth such as europium, can be made by heating in the presence of an ammonium halide, or a trivalent rare earth. Using ammonium halide as the flux, the red-emitting phosphor can be molded into a desired shape. Using ammonium halide and powdered alumina, the red-emitting phosphor can be made into a powder directly. Heating a rare earth activated (Eu) strontium sulfide in the presence of a trivalent rare earth salt in the presence of sulfur and a source of carbon, fine particle size red-emitting phosphor particles can be made.

REFERENCES:
patent: 2979467 (1961-04-01), Keller
patent: 4725344 (1988-02-01), Yocom et al.
patent: 4755324 (1988-07-01), Lindmayer
patent: 4818434 (1989-04-01), Lindmayer
patent: 4857228 (1989-08-01), Kabay et al.
patent: 5043096 (1991-08-01), Lindmayer
patent: 5650094 (1997-07-01), Royce et al.
Chemical Abstract citation 118:48398, Huettl et al, "Luminescence Decay and Efficiency of the Europium (2+) Emission in Strontium Sulfide", Electroluminescence, Proc. Int. Workshop, 6th, pp 123-7, 1992 no month.
Urbach et al "On Infra-Red Sensitive Phosphors", Jour. Optical Soc. America, vol. 36, No. 7, pp. 372-381, Jul. 1946.

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