Compositions – Inorganic luminescent compositions – Zinc or cadmium containing
Patent
1989-01-27
1990-05-15
Cooper, Jack
Compositions
Inorganic luminescent compositions
Zinc or cadmium containing
C09K 1156
Patent
active
049255932
ABSTRACT:
A cadmium-free cathodoluminescent phosphor composition consists essentially of zinc sulfide activated with from about 0.019% by weight to about 0.024% by weight of copper and from about 0.01% by weight of about 0.02% by weight of aluminum wherein the emission of the phosphor upon stimulation by cathode rays has CIE values of x of from 0.287 to 0.291 and y from 0.616 to 0.620. The process involves solid state heating of the various raw materials wherein a first relatively pure zinc sulfide and a second zinc sulfide containing chloride ions are mixed with the appropriate levels of and alkali metal chloride and sources of copper and aluminum activators and then heated in a nitrogen-carbon disulfide atmosphere for about 3 hours at 1775.degree. C. to about 1825.degree. C.
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Borchardt Richard R.
Gingerich Richard G. W.
Miller Michael J.
Castle Donald R.
Cooper Jack
GTE Products Corporation
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