Gte Sylvania Incorporated

H David Layman

Ramon L Yale

James E Mathers

Henry B Minnier

Henry B Minner

A green emitting ZnS: Cu, Al cathodoluminescent phosphor having x and y coordinate values of from 0.250 to 0.280 and 0.560 to 0.615 respectively, is produced by a critical firing schedule exemplified by slow heating to about 1000.degree. C, soaking at this temperature for about 1 hour, followed by slow cooling at about 3.degree. C per minute to 700.degree. C, followed by air quenching. The phosphor is useful for example, in tri-color television color television cathode ray tubes.

Zinc sulfide phosphor coactivated with copper and aluminum

A green emitting ZnS : Cu, Al cathodoluminescent phosphor having x and y coordinate values of from 0.250 to 0.280 and 0.560 to 0.615 respectively, is produced by a critical firing schedule exemplified by slow heating to about 1000.degree. C, soaking at this temperature for about 1 hour, followed by slow cooling at about 3.degree. C per minute to 700.degree. C, followed by air quenching. The phosphor is useful for example, in tri-color television color television cathode ray tube.

Method for producing cadmium free green emitting cathodoluminescent

A process suitable for reclaiming europium-activated yttrium oxysulfide contaminated with europium-activated yttrium oxide and other non-rare earth cathodoluminescent phosphors comprises forming a relatively uniform admixture of specific fluxing agents, the contaminated yttrium oxysulfide phosphor, a sufficient amount of reactive rare earth source selected from reactive yttrium and europium sources to achieve a predetermined yttrium to europium ratio in the admixture and an excess of the theoretical amount of sulfur required to convert the yttrium oxide and the yttrium source to yttrium oxysulfide, heating the admixture at a temperature of at least 850.degree.C in non-oxidizing atmosphere for a time sufficient to convert the yttrium oxide and the yttrium source to a europium-activated yttrium oxysulfide whereby the rare earth materials form a cathodoluminescent material and whereby the non-rare earth materials form water soluble reaction products, washing the resulting material with sufficient water to remove water soluble materials leaving a cathodoluminescent europium-activated yttrium oxysulfide phosphor.

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Ulster, PA, United States of America

H David Layman