| 摘要 |
Provided are an alpha-SiAlON activated by Eu, which can realize a higher luminance in a light-emitting device such as a white LED, and also a light-emitting device. The alpha-SiAlON is represented by the general formula: (M)x(Eu)y(Si)12-(m+n)(Al)m+n(O)n(N)16-n (wherein M denotes one or more elements including at least Ca, selected from the group consisting of Li, Mg, Ca, Y and lanthanide elements (except for La and Ce)), and is constituted by an alpha-SiAlON having Eu in the form of a solid solution. The 50% mean area diameter of primary particles of the alpha-SiAlON is 5 mum or more, and the ratio of the 50% mean area diameter of primary particles to the 50% mean area diameter of secondary particles of the alpha-SiAlON is preferably 0.56 or more. A light-emitting device 10 includes a light-emitting light source 12 and a wavelength conversion member 15, wherein the wavelength conversion member 15 includes a alpha-SiAlON 18 for absorbing near-ultraviolet to blue light generated by the light-emitting light source 12 to generate yellow to orange light.
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