Rare earth activated lanthanum and lutetium oxy-chalcogenide pho

Details Rare earth activated lanthanum and lutetium oxy-chalcogenide pho Rare earth activated lanthanum and lutetium oxy-chalcogenide pho

1977-04-04

1978-06-06

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

C09K 1146

Patent

active

RE0296627

ABSTRACT:
A family of cathodoluminescent phosphors which consist essentially of oxy-chalcogenides of lanthanum and/or lutetium containing, for each mol of phosphor, between 0.0002 and 0.2 mol of dysprosium, erbium, europium, holmium, neodymium, praseodymium, samarium, terbium, or thulium. Up to 15 mol percent of the lanthanum and lutetium may be replaced with yttrium or gadolinium. The phosphors may be prepared by reacting the constituent elements as compounds thereof at temperatures between 900 and 1300.degree. C. for 0.2 to 5.0 hours and then cooling the reaction product.

REFERENCES:
patent: 2462547 (1949-02-01), Pitha et al.
patent: 2979467 (1961-04-01), Keller
patent: 3250722 (1966-05-01), Borchardt

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