| abstract |
This embodiment provides a red light emitting fluorescent substance represented by the following formula (1): (M 1 - x EC x ) a M 1 b AlO c N d (1) In the formula, M is an element selected from group IA element, group IIA element, group IIIA element, group IIIB element, rare earth element and group IVA element; EC is Eu, Ce, Mn, Tb, Yb, Dy, Sm, Tm, Pr, Nd, Pm, Ho, Er, Cr, Sn, Cu, Zn, As, Ag, Cd, Sb, Au, Hg, Tl, An element selected from Pb, Bi and Fe; M 1 is different from M and is selected from the group consisting of tetravalent elements; x, a, b, c and d are numbers satisfying 0 <x <0.2, 0.55 <a <0.80, 2.10 <b <3.90, 0 <c≤0.25 and 4 <d <5, respectively. This material emits light with a peak in the wavelength range of 620-670 nm when excited with light of 250-500 nm. |