Patent ID: 8398890

Claim:
A phosphor comprising a crystal phase represented by formula [I], R 3−x−y−z+w2 M z A 1.5x+y−w2 Si 6−w1−w2 Al W1+w2 O y+w1 N 11−y−w1 [I] wherein, R represents at least one kind of a rare-earth element selected from the group consisting of La, Gd, Lu, Y and Sc, wherein La is used in an amount of at least 70 mol percent relative to the total amount of R, M represents at least one kind of a metal element selected from the group consisting of Ce, Eu, Mn, Yb, Pr and Tb, A represents at least one kind of a bivalent metal element selected from the group consisting of Ba, Sr, Ca, Mg and Zn, and x, y, z, w1 and w2 are the numeric values wherein: ( 1/7)≦(3− x−y−z+w 2)/6<(½), 0<(1.5 x+y−w 2)/6<(9/2), 0<x<3, 0≦y<2, 0<z<1, 0<w1≦5, 0≦w2≦5, and 0≦ w 1+ w 2≦0.4, wherein color coordinates x and y, in CIE standard colorimetric system, of the luminescent color when excited with light having 460-nm wavelength are in the ranges of 0.420≦x≦0.600 and 0.400≦y≦0.570, respectively.