Yb activated hafnium oxide phosphor and methods of making

Details Yb activated hafnium oxide phosphor and methods of making Yb activated hafnium oxide phosphor and methods of making

1975-05-05

1977-02-01

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

C09K 1146

Patent

active

040060977

ABSTRACT:
A phosphor composition having the general formula HfO.sub.2 :Yb with ytterbium being present in an amount of from 0.005 to 0.10 moles per mole of hafnium is disclosed. The phosphor can be prepared from the mixed oxides or from the oxalates, carbonates, or hydroxides by precipitating the latter from an aqueous solution. Firing takes place under a reducing atmosphere, preferably nitrogen, to reduce the ytterbium to the plus 2 ion. The phosphor is a bright green emitter under ultraviolet, x-radiation and cathode ray excitation.

REFERENCES:
patent: 3322682 (1967-05-01), Thompson
patent: 3338841 (1967-08-01), Brixner
patent: 3449259 (1969-06-01), Ropp
Iwase et al. "Chem. Abstracts" vol. 61, 1964, p. 6545e.
Calgerova et al. "Chem. Abstracts" vol. 79, 1973, p. 59486x.
Kroger "Some Aspects of the Luminescence of Solids", Elseveviar Pub. Co., 1948, p. 298.
Kroger et al. "Chem. Abstracts", 1954, p. 3150b.

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