| abstract |
The present invention relates to "at least Li, A elements (but, A is one or two or more elements selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm, Yb), M An element (but M is one or two or more metal elements other than Li and A elements), Si, Al, oxygen, and nitrogen, and has an α-sialon crystal structure,n n n (Li x1 , A x2 , M x3 ) (Si 12- (m + n) Al m + n ) (O n N 16-n )n n n 1.2≤x1≤2.4 ‥‥‥‥‥‥‥? (1)n n n 0.001≤x2≤0.4 ‥‥‥‥‥‥? (2)n n n 0≤x3≤1.0 ‥‥‥‥‥‥‥‥‥ (3)n n n And a phosphor mainly composed of an α-sialon crystal having an emission peak at a wavelength in the range of 400 nm to 700 nm. This invention has little brightness fall and can be used suitably for a white LED etc. |