| 摘要 |
A fluorophor comprising, as a main component, an alpha-type sialon crystal which contains at least an A element (wherein A represents one or more elements selected from among Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm and Yb), an M element (wherein M represents one or more elements selected from among Li, Na, Mg, Ca, Y, La, Gd and Lu), Si, Al, oxygen and nitrogen, and is represented by the general formulae: (Mx, Ay)(Si12-(m+n)Alm+n)(OnN16-n) (1) m=deltaMxx+deltaAxy (2) 0.2<=x<=2.4 (3) 0.001<=y<=0.4 (4) and 0.5xm<n<=4 (5). The fluorophor is reduced in the lowering of brightness, and is useful for a white color LED and the like.
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