Phosphor for cathode ray tube
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorHiroshi Okuda
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Abstract
A novel phosphor for a cathode ray tube comprising Y.sub.2 O.sub.2 S:Eu containing barium fluoride is disclosed which has a long afterglow, maintains high emission efficiency, and has high color purity.
Claims2
A phosphor for a cathode ray tube comprising Y.sub.2 O.sub.2 S:Eu and from about 0.1 to about 5.0 wt.% barium fluoride based on the weight of the Y.sub.2 O.sub.2 S:Eu, said phosphor being obtained by firing a mixture of a trivalent europium-activated yttrium sulfide and oxide phosphor of the formula Y.sub.2 O.sub.2 S:Eu and from about 0.1 to about 5.0% by weight barium fluoride based on the weight of said Y.sub.2 O.sub.2 S:Eu, said firing being conducted at a temperature of from about 1300.degree. C. to about 1400.degree. C. in a weakly reducing atmosphere, said atmosphere preventing the oxidation of said mixture.
Dependencies are inferred from the claim text.