Patent ID: 6706210
Filing Date: 2004-03-16
Classification: C09K

Abstract:
A process for preparing phosphor particles of formula:ZzXxOy:RE where Z is a metal of valency b,X is a metal or metalloid, of valency a, such that 2y=b.z+a.x, and RE is a dopant ion of terbium, europium, cerium, thulium, samarium, holmium, erbium, dysprosium, praseodymium, manganese, chromium or titanium having a size not exceeding 1 micron which comprisespreparing an aqueous solution of salts of Z, X and RE and a water soluble compound which decomposes under the reaction conditions to convert said salts into hydroxycarbonate, heating the solution so to cause said compound to decompose, recovering the resulting precipitate and calcining it at a temperature of at least 500Â° C.