| abstract |
The present invention provides a general formula: (Ml) x (M2) Y (Si, Al) 12 (O, N) 16 (wherein M1 represents Li, Mg, Ca, Y and lanthanide metals (La and Ce) At least one element selected from the group consisting of Ce, Pr, Eu, Tb, Yb, Er, and 0.3 <X + Y <1.5, 0 < Y type | mold sialon represented by Y <0.7) containing 0.003 weight%-1 weight% of fluorine as an impurity. By setting the average of the primary particle diameters of the α-sialon of the present invention to 1 to 10 µm, the α-sialon phosphor can be obtained stably and in large quantities with good reproducibility. In particular, when 0.003% by weight to 0.02% by weight of fluorine as an impurity is contained, excellent luminescence properties are exhibited as a white phosphor.n n n n Sialon, phosphor, fluorine, LED, diode |