Rare earth activated rare earth fluorogermanate

Details Rare earth activated rare earth fluorogermanate Rare earth activated rare earth fluorogermanate

1978-08-09

1979-07-24

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

2523014H, C09K 1146

Patent

active

041622324

ABSTRACT:
Rare earth activated rare earth fluorogermanates, represented by the formula: [R.sub.1.sbsb.x R.sub.2.sbsb.(1-x) ].sub.a F.sub.b GeO.sub.C wherein x is a value from about 0.9 to about 0.9998, a is a value of from about 2 to about 4, b is from about 0.85 to about 3.15, c is from about 4 to about 7.5 R.sub.1 is selected from the group of Y, Gd and La and R.sub.2 is selected from Eu, Gd, Tb and Pr and R.sub.1 and R.sub.2 are different, are excited by long or short wavelength ultraviolet light. A solid state process for using a blend of the metal oxides and a heat-decomposable fluorine compound is disclosed along with a preferred embodiment wherein the dual rare earth oxide is formed prior to forming the aforementioned blend of metal oxides.

REFERENCES:
patent: 2748303 (1956-05-01), Thorington
patent: 3650974 (1972-03-01), Ward
patent: 3715611 (1973-02-01), De Mesquita et al.
patent: 3758413 (1973-09-01), Peters
patent: 3923529 (1975-12-01), Araujo et al.
patent: 4052329 (1977-10-01), Fukada et al.

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