alpha-SIALON, LIGHT-EMITTING DEVICE AND USE THEREOF
First Claim
1. An α
- -SiAlON 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)), wherein a 50% mean area diameter of primary particles of the α
-SiAlON is 5 μ
m or more.
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Accused Products
Abstract
Provided are an α-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 α-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 α-SiAlON having Eu in the form of a solid solution. The 50% mean area diameter of primary particles of the α-SiAlON is 5 μm 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 α-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 α-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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Citations
14 Claims
-
1. An α
- -SiAlON 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)), wherein a 50% mean area diameter of primary particles of the α
-SiAlON is 5 μ
m or more. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- -SiAlON represented by the general formula;
Specification