| 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 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: n 0< x ≦1, 0.93< a 2<1.3, 4.0< b 2<5.8n n 0.6< c 2<1, 6< d 2<11). |