Patent ID: 8858835

Claim:
A light emitting device comprising: a fluorescent substance (R) represented by the following formula (1): (M 1-x EC x ) a M 1 b AlO c N d (1), wherein M is an element selected from the group consisting of IA group elements, IIA group elements, IIIA group elements, IIIB group elements, rare earth elements and IVA group elements; EC is an element selected from the group consisting of Eu, Ce, Mn, Tb, Yb, Dy, Sm, Tm, Pr, Nd, Pm, Ho, Er, Cr, Sn, Cu, Zn, As, Ag, Cd, Sb, Au, Hg, Tl, Pb, Bi and Fe; M 1 is different from M and is selected from the group consisting of tetravalent elements; and x, a, b, c and d are numbers satisfying the conditions of 0<x<0.2, 0.55<a<0.80, 2.10<b<3.90, 0<c≦0.25 and 4<d<5, respectively; and the fluorescent substance (R) emits luminescence having a peak in the wavelength range of 620 to 670 nm under excitation by light in the wavelength range of 250 to 500 nm, and a light-emitting element to excite said fluorescent substance, wherein said light-emitting element is a light-emitting element giving off light in the wavelength range of 250 to 500 nm, and another fluorescent substance (Y) is further incorporated that emits luminescence having a peak in the wavelength range of 540 to 580 nm under excitation by light of said light-emitting element (S 1 ).