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The embodiment provides a red light-emitting fluorescent substance represented by the following formula (1) : €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ (M 1-x EC x ) a M 1 b AlO c N d €ƒ€ƒ€ƒ€ƒ€ƒ(1) In the formula (1), 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, TI, 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

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