Method of preparing manganese activated zinc orthosilicate phosp

Details Method of preparing manganese activated zinc orthosilicate phosp Method of preparing manganese activated zinc orthosilicate phosp

1994-09-14

1997-03-18

Bonner, Melissa

Compositions

Inorganic luminescent compositions

Zinc or cadmium containing

2523014F, C09K 1154

Patent

active

056119615

ABSTRACT:
A process for producing a manganese activated zinc orthosilicate phosphor. An aqueous dispersion is prepared including fumed silica having an ultrafine average particle size of less than 50 nm, a zinc precursor, and a manganese precursor. The molar ratio of zinc:silicon in the dispersion is approximately 1.3:1 to 2.0:1, and the molar ratio of manganese in the dispersion is sufficient to activate the phosphor. The precipitate from the dispersion is calcined in an inert atmosphere at a temperature and for a time sufficient to form a manganese activated zinc silicate phosphor having a broad band emission peaking in the green region of the visible spectrum when stimulated by external radiation at approximately 254 nm. The calcined phosphor may be milled to achieve an average particle size of less than 5 .mu.m, the milling step being performed without significant loss of plaque brightness. Also disclosed is a green emitting manganese activated zinc silicate phosphor having an average particle size of less than 5 .mu.m and excellent brightness.

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