A new blue-emitting chalcogenide phosphor, Ce 3+ -activated CaLaGa 3 S 6 O, with a high purity crystalline was synthesized by a two-step solid-state reaction. Photoluminescence properties of CaLaGa 3 S 6 O:Ce 3+ were investigated comparatively with the commercial blue-emitting phosphor BaMgAl 10 O 17 :Eu 2+ . It shows a more perfect and efficient broad absorption band around the 398nm emission of the commercial near ultraviolet light-emitting diodes (LEDs), and presents a comparable blue-emitting performance. The blue light-emitting LED with the CIE chromaticity coordinates of (0.147, 0.089) was successfully fabricated by precoating CaLaGa 3 S 6 O:Ce 3+ phosphor onto a 398nm-emitting InGaN chip. All these results indicate that CaLaGa 3 S 6 O:Ce 3+ is a promising blue phosphor candidate for white LEDs.
