A new blue-emitting phosphor, SrLaGa3S6O:Ce3+, was prepared by a two-step high temperature solid-state reaction. X-ray powder diffraction analysis confirmed the formation of SrLaGa3S6O:Ce3+. The photoluminescence spectra showed that this phosphor can be excited efficiently by UV-visible light from 250 to 420 nm and emitted intensely blue light with two emission bands peaking at about 430 and 467 nm. The blue light-emitting LED with the CIE chromaticity coordinates of (0.152, 0.059) was successfully fabricated by precoating SrLaGa3S6O:Ce3+ phosphor onto a 398 nm-emitting InGaN chip. Its CIE chromaticity coordinates were almost the same as the NTSC standard values for blue. SrLaGa3S6O:Ce3+ could be a promising blue phosphor candidate for white LEDs. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3601850] All rights reserved.