Core-shell structured SiO₂@Lu(OH)₃ particles have been successfully fabricated via a urea-assisted homogeneous precipitation method using Stöber method derived silica as templates. LSO:Ce^3＋ phosphors were obtained by a subsequent calcination procedure. It was found that the calcinations temperature had a great influence on the phase and morphology of the final phosphors. A single-phase LSO:Ce^3＋ was prepared at 1200 ℃ for 2 h. The sample treated at 900 ℃ shows spherical morphology with the particle size of about 400～500 nm, while the sample calcined at higher temperature displays irregular shape with some aggregation. The photoluminescence (PL) spectra of the sample treated at 1200 ℃ were investigated. The excitation spectrum is dominated by a broad band centered at 360 nm. Monitored with 360 nm UV emission, the emission spectrum consists of a broad band ranging from 384 nm to 440 nm with a maximum peak at 420 nm, which can be attributed to the 5d→4f transition of Ce^3＋.

Key words: Lu₂SiO₅, coprecipitation template method, luminescent property, preparation