| abstract |
A phosphor capable of providing a white LED having excellent luminous efficiency using a blue LED or an ultraviolet LED as a light source, the phosphor having the general formula: (M1) X (M2) Y (Si, Al) 12 (O, N) 16 ( Provided that M1 is at least one element selected from the group consisting of Li, Mg, Ca, Y and lanthanide elements (except La and Ce), and M2 is a group consisting of Ce, Pr, Eu, Tb, Yb and Er It is an at least 1 element selected from (alpha), It consists of a powder whose alpha surface area is 0.2-0.5 m < 2> / g as a main component as (alpha) sialon represented by 0.3 <= X + Y <= 1.5 and 0 <Y <0.7). |