Granular rare earth phosphates having characteristic morphology

Details Granular rare earth phosphates having characteristic morphology Granular rare earth phosphates having characteristic morphology

1993-07-29

1995-11-28

Bell, Mark L.

Compositions

Inorganic luminescent compositions

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

423263, C09K 1183, C01B 2537, C01B 2545

Patent

active

054705037

ABSTRACT:
Monodisperse particulates of a rare earth phosphate having the formula LnPO.sub.4 in which Ln is at least one rare earth, the average particle size of which ranging from 1 to 20 microns and preferably from 2 to 6 microns, and having a dispersion index of less than 0.5, preferably less than 0.4, are well suited as luminophors or precursors thereof, and are prepared via precipitation with phosphate ions at a substantially constant pH below 2, from rare earth salt solutions.

REFERENCES:
patent: 3507804 (1970-04-01), Ropp
patent: 4423349 (1983-12-01), Nakajma et al.
patent: 5091110 (1992-02-01), Fan et al.
Ropp I. "J. Electrochem Soc.", vol. 115, No. 5, 1968, no month pp. 531-535.

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