| 摘要 |
An object of the present invention is to provide a yellow light-emitting fluorescent substance rich in red and green components and a light-emitting device and an illuminator favorable in color rendering properties prepared by using the fluorescent substance. The present invention relates to an oxynitride fluorescent substance comprising Lu, Al, O, N, Ce, and X and containing cerium in a great amount. It is a fluorescent substance, wherein: X is at least one element selected from the group consisting of Bi, Tb, Pr, Gd, Se, Sm, Th, Ir, Sb, and As; 0.007 mass % ‰¤ N ‰¤ 5.0 mass %; Ce, X, and Lu satisfy 0.015 ‰¤ (Ce+X)/Lu by molar ratio; Al, O, and N satisfy Al/(O+N) > 5/13 by molar ratio; and X>0. Another invention relates to a light-emitting device comprising the fluorescent substance and a light-emitting element. Yet another invention relates to an illuminator comprising the light-emitting device. |
