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