| abstract |
The phosphor material of the white LED which uses a blue LED or an ultraviolet LED as a light source is provided.n n n General formula: (M1) X (M2) Y (Si) 12- (m + n) (Al) m + n (O) n (N) 16-n (wherein M1 is Li, Mg, Ca, Y and One or more elements selected from the group consisting of lanthanide metals (except La and Ce), M2 is one or more elements selected from Ce, Pr, Eu, Tb, Yb and Er, and 0.3 ≦ X + Y It is a phosphor which consists of alpha type sialon represented by ≤1.5, 0 <Y≤0.7, 0.6≤m≤3.0, 0≤n≤1.5, and X + Y = m / 2), and the amount of oxygen contained in the α-sialon powder The phosphor, characterized in that more than 0.4% by mass or less than the value calculated based on the general formula.n n n n Phosphor |