Phosphor purification process

Details Phosphor purification process Phosphor purification process

1979-05-04

1980-09-09

Therkorn, Ernest G.

Compositions

Inorganic luminescent compositions

Zinc or cadmium containing

C09K 1110

Patent

active

042216761

ABSTRACT:
A process for removing suspected heavy metal contaminants from a manganese-arsenic activated, zinc orthosilicate phosphor comprises contacting the phosphor, in an aqueous slurry, with an organic chelating agent such as an alkali metal salt of ethylenediamine tetraacetate and subsequently rinsing, filtering, drying and sieving the phosphor and baking the sieved phosphor.

REFERENCES:
patent: 2844540 (1958-07-01), Rulon
patent: 3047512 (1962-07-01), Martyny
patent: 3082344 (1963-03-01), Thornton
patent: 3273806 (1966-09-01), Aoki
patent: 3351194 (1967-11-01), Butler
patent: 3447682 (1969-06-01), Hedler
patent: 3538013 (1970-11-01), Graft
patent: 3586635 (1971-06-01), Vanilc
patent: 3757938 (1973-09-01), Wachtel
Bull, The Thermolumienscence Characteristics of Silicate Phosphors Activated by Manganese and Arsenic, Journal of the Electrochemical Society, Sep. 1951, pp. 371-375.

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