| 摘要 |
PROBLEM TO BE SOLVED: To provide a luminescent material which exhibits little decrease in emission intensity even at high temperatures.SOLUTION: The luminescent material exhibits a luminescence peak in a wavelength range from 490 nm to 580 nm when excited with light having an emission peak in a wavelength range from 250 nm to 500 nm. The diffraction peak intensity (I) of the largest peak generated at 2&thetas;=30.1°-31.1°is higher than the diffraction peak intensity (I) generated at 2&thetas;=25.0°-26.0° in X-ray diffraction with the Bragg-Brendano method using Cu-Kα line. The luminescent material has a composition represented by the general formula (1) defined by: (MEu)AlSiON, where M is Sr and some of Sr may be substituted with at least one selected from Ba, Ca, Mg and Na, where x, y, z, u and w satisfy 0<x≤1, -0.1≤y≤0.3, -3≤z≤-0.52, -1.5≤u≤-0.3, and -3<u-w≤1. |
