| 摘要 |
This invention provides a blue fluorescent substance, which has higher blue brightness and larger half-value width in a luminescence spectrum as compared with the conventional rare earth-activated sialon fluorescent substance and has better durability as compared with the conventional oxide fluorescent substance. The fluorescent substance comprises a metal element M, wherein M represents Ce, dissolved as a solid solution in a nitride or oxynitride crystal having a ß-type Si<SUB>3</SUB>N<SUB>4</SUB> crystal structure, an AlN crystal structure, or an AlN polytype structure, and emits fluorescence having a peak in a wavelength range of 450 nm to 500 nm upon exposure to light from an excitation source. |
