| abstract |
The present invention provides "at least Li and an A element (where A is one or more elements selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm, Yb). And M element (where M is one or more metal elements other than Li and A elements), Si, Al, oxygen and nitrogen, and has an α-sialon crystal structure. Then, the general formula (Li x1 , A x2 , M x3 )(Si 12-(m+n) Al m+n ) (O n N 16-n ) is used. 1.2 ≤ x1 ≤ 2.4 (1) 0.001 ≤ x2 ≤ 0.4 ・・・・・・・・(2) 0 ≤ x3 ≤ 1.0 (3) , Which is mainly composed of an α-sialon crystal having an emission peak in the wavelength range of 400 to 700 nm. INDUSTRIAL APPLICABILITY The present invention has little decrease in brightness and can be suitably used for white LEDs and the like. |