Coating processes – Particles – flakes – or granules coated or encapsulated – Inorganic base
Patent
1988-12-22
1990-01-09
Cooper, Jack
Coating processes
Particles, flakes, or granules coated or encapsulated
Inorganic base
2523015, 2523016F, 4273722, C09K 1159
Patent
active
048927570
ABSTRACT:
A method is disclosed for reproducibly producing manganese activated zinc silicate phosphor particles, which comprises dry blending a mixture of components consisting essentially of zinc oxide, silicic acid, a source of manganese, ammonium chloride, ammonium fluoride, tungstic oxide, and silica, wherein the Zu+Mn/Si mole ratio is from about 1.95 to about 2.02, wherein the silica is colloidal and has a surface area of from about 50 to about 410 m.sup.2 per gram, and wherein the colloidal silica makes up from about 0.01% to about 1.0% by weight of the mixture, and firing the resulting dry blend of components in a nitrogen atmosphere at a temperature of from about 1200.degree. C. to about 1300.degree. C. for a sufficient time to produce the phosphor wherein the phosphor exhibits reproducible brightness.
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Gray Leslie F.
Henson Thomas L.
Kasenga Anthony F.
MacInnis Martin B.
Castle Donald R.
Cooper Jack
GTE Products Corporation
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