Patent ID: 8992797
Filing Date: 2015-03-31
Classification: C09K,H01L,H05B

Abstract:
1. A phosphor comprising a crystal phase represented by formula [I], wherein, R represents at least one kind of a rare-earth element selected from the group consisting of La, Gd, Lu, Y and Sc, M represents at least one kind of a metal element selected from the group consisting of Ce, Eu, Mn, Yb, Pr and Tb, A represents at least one kind of a bivalent metal element selected from the group consisting of Ba, Sr, Ca, Mg and Zn, and x, y, z, w1 and w2 are the numeric values wherein: the wavelength of emission peak of the emission spectrum when excited with light of 460-nm wavelength is 510 nm or longer and 580 nm or shorter, and in the powder X-ray diffraction pattern measured with CuKα line (1.54184 Å), a peak exists at 2θ from 17° to 20°, and a peak intensity ratio I, related to a peak present at 2θ from 21° to 24°, is 0.05 or smaller, where the peak intensity ratio I is defined by, in the powder X-ray diffraction pattern at 2θ ranging from 10° to 60°, the ratio of height I the values of the peak intensities are used after background correction.