Sintered at different sintering temperatures, Eu 2+ doped BaAl 2 Si 2 O 8 phosphors were synthesised through one-step calcination process of precursors prepared by chemical coprecipitation method. Thermal gravity-differential thermal analysis was used to investigate the initial temperature of phase transition and the optimal sintering temperature of the sample synthesis. The X-ray diffraction patterns confirmed that the sample calcined at 1200°C possessed a single hexagonal phase of BaAl 2 Si 2 O 8. Although a little BaAl 2 Si 2 O 8 phase had been produced, BaAl 2 O 4 phase was dominant in the sample calcined at 1000°C. The morphology of the sample observed by scanning electron microscope showed smooth surfaces and nearly spherical shapes at higher sintering temperature. The emission spectrum of the sample calcined at 1000°C was separated into three Gaussians with the maximum at about 455, 501 and 540 nm, due to the 4f 7 →4f 6 5d transitions of Eu 2+ ions occupying the Ba site of BaAl 2 Si 2 O 8 and the Ba(1) and Ba(2) site of BaAl 2 O 4 , respectively. With the increase of sintering temperature, BaAl 2 Si 2 O 8 :Eu 2+ phosphor exhibited a blue broad emission band peaking at 455 nm with full width at half maximum about 90 nm under near-ultraviolet excitation at ∼400 nm, and its emission intensity increased considerably due to the improved crystalline and homogeneous distribution of Eu 2+ ions.