FLUORESCENT SUBSTANCE, PROCESS FOR PRODUCING THE SAME, AND LUMINESCENT DEVICE

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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 F-type Si3N4 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. © KIPO & WIPO 2008