Method for preparing small particle size fluoride up-converting

Details Method for preparing small particle size fluoride up-converting Method for preparing small particle size fluoride up-converting

1997-05-02

1999-04-06

Bonner, Melissa

Compositions

Inorganic luminescent compositions

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

423464, 423263, 423489, C09K 1185

Patent

active

058913610

ABSTRACT:
Spherical particles of fluoride up-converter phosphors having a particle size of 1 micron and less can be made from their corresponding precursor hydroxycarbonate particles by heating the hydroxycarbonate particles in an oxygen-containing atmosphere to convert the hydroxycarbonate to the corresponding oxide but without changing the size and shape of the particles, and then heating the phosphor oxide particles to their corresponding fluoride particles by heating in SF.sub.6, at a temperature that will crack the SF.sub.6 but will not change the size or shape of the phosphor particles.

REFERENCES:
patent: 3541018 (1970-11-01), Hewes et al.
patent: 3956147 (1976-05-01), Becker et al.
patent: 4021530 (1977-05-01), Layne et al.
patent: 5015452 (1991-05-01), Matijevic
patent: 5674698 (1997-10-01), Zarling et al.
Canadian Patent No. 936351, Issued Nov. 6, 1973.
International Publication Number WO 96/01297, Published 18 Jan. 1996.

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