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In this letter, a yellow oxynitride phosphor-SiAlON with compositions of Ca0. 625EuxSi0. 75− 3xAl1. 25+ 3xOxN16− x (Ca--SiAlON: Eu, x= 0–25) was prepared by gas pressure sintering. The diffuse reflection spectrum, photoluminescence spectrum, and chromaticity of the powder phosphors were presented. It absorbs light efficiently in the UV–visible spectral region, and shows a single intense broadband emission at 583–603 nm. This phosphor may become a good candidate for creating white light, typically warm white light, when coupled to a blue light-emitting diode (em= 450 nm).© 2004 American Institute of Physics.[DOI: 10.1063/1.1767596]

Compared to conventional incandescent and fluorescent lamps, the light-emitting diodes (LEDs)-based white light sources are superior in lifetime, efficiency, and reliability, which promise significant reductions in power consumption and in pollution from fossil fuel power …