| abstract |
In order to provide the new fluorescent substance which a fluorescence emits a lot of red components, and a half value width is wide, the fluorescent substance contains the crystal phase shown by Formula [I].n n n R 3 -xy-z + w2 M z A 1.5 x + y- w2 Si 6 - w1 - w2 Al w1 + w2 O y + w1 N 11 -y- w1 [I]n n n (R is represented by La, Gd, Lu, Y and / or Sc, M is represented by Ce, Eu, Mn, Yb, Pr and / or Tb, and A is represented by Ba, Sr, Ca, Mg and / or Zn) , x, y, z, w1 and w2 each represent a numerical value in the following range.n n n (1/7) (3-xy-z + w2) / 6 <(1/2)n n n 0 <(1.5x + y-w2) / 6 <(9/2)n n n 0 <x <3n n n 0 y <2n n n 0 <z <1n n n 0 w1 5n n n 0 w2 5n n n 0 w1 + w2 5) |