Method of preparing rare earth pyrohafnate phosphors

Details Method of preparing rare earth pyrohafnate phosphors Method of preparing rare earth pyrohafnate phosphors

1975-05-19

1977-03-29

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

C09K 1146

Patent

active

040148122

ABSTRACT:
Phosphors having the general formula (A.sub.1.sub.-x RE.sub.x).sub.2 Hf.sub.2 O.sub.7 are disclosed wherein A is selected from the group consisting of yttrium, gadolium, lanthanum, scandium and lutetium; RE is selected from the group consisting of praseodymium, samarium, europium, terbium, dysprosium, holmium, erbium and thulium; and x is from about 0.001 to 0.10. The phosphors are prepared by dissolving an oxide of A and an oxide of RE in a mineral acid and dissolving HfOCl.sub.2 in water and combining the two solutions. A precipitating agent such as oxalic acid is added and the precipitate is washed, dried and fired to produce the phosphors.

REFERENCES:
patent: 2542336 (1951-02-01), Kroger et al.
patent: 2770749 (1956-11-01), Bril et al.
patent: 3322682 (1967-05-01), Thompson
McCauley et al., "Chem. Abstracts", vol. 78, 1973, 142047e.
Borchardt, "J. of Chem. Physics", vol. 42, No. 11, 1965, pp. 3743-3745.

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