| abstract |
A luminescent material which is featured in that it exhibits an emission peak at a wavelength ranging from 490 to 580 nm as it is excited by light having a wavelength ranging from 250 to 500 nm and that it has a composition represented by the following general formula (2): n(M 1-x R x ) a2 AlSi b2 O c2 N d2 (2) n(In the general formula (2), M is at least one metallic element excluding Si and Al, R is a luminescence center element, and x, a2, b2, c2 and d2 satisfy the following relationships: 0 < x ¤ 1 , 0.93 < a ¢ 2 < 1.3 , 4.0 < b ¢ 2 < 5.8 0.6 < c ¢ 2 < 1 , 6 < d ¢ 2 < 11 ) . |