Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1974-12-23
1976-03-02
Cooper, Jack
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
423 21, C09K 1146
Patent
active
039417140
ABSTRACT:
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.
REFERENCES:
patent: 3348924 (1967-10-01), Levine et al.
patent: 3418246 (1968-12-01), Royce
patent: 3502590 (1970-03-01), Royce et al.
patent: 3763050 (1973-10-01), Dikhaff
patent: 3864273 (1975-02-01), Forbes et al.
Layman H. David
Mathers James E.
Yale Ramon L.
Castle Donald R.
Cooper Jack
Fox John C.
GTE Sylvania Incorporated
O'Malley Norman J.
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