Ce-doped Y 2 SiO 5 phosphor particles with spherical morphology, small size, high crystallinity, and good photoluminescence (PL) intensity were prepared by spray pyrolysis. The characteristics of prepared particles were compared with those of commercial ones. The particles annealed above 10003C had a clear crystallinity of Y 2 SiO 5 , and the crystal structure changed from X 1 to X 2 type after annealing above 12003C. The mean size of the particles increased from 0.5 to 1.4 m when the overall solution concentrations were varied from 0.045 to 0.9 mol/liter. The photoluminescence intensity and crystallinity of particles increased as the particle size and preparation temperature were increased. The annealed particles larger than 0.8 m maintained a spherical morphology. Emission of blue light was observed after annealing above 10003C on excitation with an UV light. The PL spectra particles annealed below 11003C had maximum values at 450 nm, and shifted to the smaller wavelengths after annealing above 12003C. The brightness of particles increased with increasing annealing temperatures due to favorable crystallization and had a maximum at 14003C. The particles annealed above 14003C exhibited intensities higher than those of particles produced commercially.