Hafnium pyrophosphate phosphors and methods of preparation

Details Hafnium pyrophosphate phosphors and methods of preparation Hafnium pyrophosphate phosphors and methods of preparation

1975-01-13

1977-03-29

Vertiz, Oscar R.

Compositions

Inorganic luminescent compositions

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

423305, C09K 1108, C01B 2526

Patent

active

040148130

ABSTRACT:
Self-activated ultraviolet-emitting hafnium pyrophosphate phosphors. Up to about 20 mole percent of the hafnium may be substituted with one or more of zirconium, germanium and silicon. The phosphors, which may be excited by ultraviolet radiation, x-rays and electron beams, may be used as energy converters in photodevices. The phosphors may be prepared by heating a mixture of a hafnium compound, a phosphate (no added activator ions) and optionally compounds of one or more of zirconium, germanium and silicon, which are present in proportions up to about 25 mole percent of the hafnium present, at about 1000.degree. to 1300.degree. C in air.

REFERENCES:
patent: 3351436 (1967-11-01), Sarver
patent: 3642651 (1972-02-01), Marboe et al.
patent: 3814967 (1974-06-01), Takata et al.
Chemical Abstract, 3150a, (1954).

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