Method of preparing halophosphate phosphor of controlled particl

Details Method of preparing halophosphate phosphor of controlled particl Method of preparing halophosphate phosphor of controlled particl

1973-03-27

1976-02-24

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

423308, C09K 1142

Patent

active

039403432

ABSTRACT:
A method of preparing a halophosphate phosphor of controlled particle size with includes the step of compacting the calcium hydrogen orthophosphate di-hydrate crystals. The steps in the method include precipitating the calcium hydrogen orthophosphate di-hydrate crystals from a fluid formed by mixing a calcium chloride solution or a calcium nitrate solution and a diammonium phosphate solution, separating the precipitated di-hydrate crystals from the remainder of the fluid, compacting the di-hydrate crystals, converting the di-hydrate into de-hydrate crystals, preparing a raw mix containing the de-hydrate crystals, and firing the raw mix to form the halophosphate phosphor. The di-hydrate crystals may be separated from the remainder of the fluid by filtering, in which case, the compacting is preferably achieved by pressing the crystals against the filter. The di-hydrate crystals may also be separated from the remainder of the fluid by centrifuging, in which case, the compacting is provided by the centripetal-centrifugal forces present during centrifuging. After centrifuging, the crystals must be deagglomerated.

REFERENCES:
patent: 3099627 (1963-07-01), Mooney et al.
patent: 3242369 (1966-03-01), King et al.
patent: 3395979 (1968-08-01), Schafer
patent: 3635660 (1972-01-01), Bruce et al.

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