Hafnium pyrophosphate phosphors and methods of preparation

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

C - Chemistry, Metallurgy

09

K

31/203

C09K 11/08 (2006.01) C01B 25/42 (2006.01) C09K 11/70 (2006.01)

Patent

CA 1055246

HAFNIUM PYROPHOSPHATE PHOSPHORS AND METHODS OF PREPARATION ABSTRACT OF THE DISCLOSURE 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 he 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° to 1300°C in air.

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