Patent ID: 8221713

Claim:
A method for making fluorescing mono-dispersed metal titanate, the method comprising the steps of: (a) mixing titanate ester, metal salt, and rare earth metal salt in a molar ratio of 1:1:x in a reaction medium comprised of ethanol and water to form a solution, wherein x is in the range from above 0 to 0.1; (b) heating the solution, under an alkaline condition to form a white sediment; (c) filtering out liquid part of the solution to obtain the white sediment, (d) washing the white sediment, and (e) drying the white sediment to obtain rare earth metal doped mono-dispersed metal titanate, wherein the rare earth metal in the rare earth metal salt comprises at least one material selected from the group consisting of europium, terbium, erbium, ytterbium and thulium, and the rare earth metal salt fluoresces the mono-dispersed metal titanate.