Patent ID: 6960310

Claim:
A phosphor for vacuum ultraviolet ray-excited light-emitting elements which comprises a compound represented by the following formula (I)′: M 1 1−a−b−c−d M 2 a M 3 b M 4 1−e M 5 11−f M 6 c+d+e+f O 19−(b+c+f)/2 (I)′ wherein M 1 is at least one element selected from the group consisting of La, Y and Gd, M 2 is at least one element selected from the group consisting of Ce and Tb, M 3 is at least one element selected from the group consisting of Ca, Sr and Ba, M 4 consists of Mg and Zn, M 5 is at least one element selected from the group consisting of Al and Ga, and M 6 is at least one element selected from the group consisting of Mn and Eu, and a, b, c, d, e and f are numbers satisfying the conditions of 0≦a<1, 0≦b≦0.6, 0≦c≦0.5, 0≦d≦0.5, 0≦e<1, 0≦f<1, a+b+c+d<1, and 0<c+d+e+f, respectively.