| abstract |
The present invention relates to at least "A element (wherein A is one or two or more elements selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm, Yb) and M element ( However, M contains one or two or more elements selected from Li, Na, Mg, Ca, Y, La, Gd, and Lu, Si, Al, oxygen, and nitrogen. It is related with the fluorescent substance whose main component is the alpha sialon crystal shown by 1) and (2). This invention has little brightness fall and is useful for a white LED etc.n n n (M x , A y ) (Si 12- (m + n) Al m + n ) (O n N 16-n ) (1)n n n m = δ M × x + δ A × y (2)n n n 0.2≤x≤2.4 (3)n n n 0.001≤y≤0.4 (4)n n n 0.5 × m <n≤4 (5) |