Patent ID: 6042747
Filing Date: 2000-03-28
Classification: C09K,H01J

Abstract:
A method of forming a europium activated yttrium, gadolinium borate phosphor having the empirical formula:(Y.sub.1-x-y-z Eu.sub.x Gd.sub.y M.sub.z) BO.sub.3wherein: 0.01.ltoreq.x.ltoreq.0.1, 0.ltoreq.y.ltoreq.0.5; M=Mg, Ca, Sr or Ba; and z.ltoreq.0.1; said method comprising the steps of:reacting a dilute solution comprising a source of yttrium, a source of gadolinium, a source of europium, a source of an alkaline earth metal and an organic precursor providing a source of boron in an acid medium, to form a gel; andthermally decomposing said gel at a temperature below a solid state reaction temperature to obtain said phosphor.