Patent ID: 9303206
Filing Date: 2016-04-05
CPC Classification: C09K,H01L,H05B

Claim Text:
1. A phosphor which emits light having a peak wavelength between a green wavelength band and a yellow wavelength band and has a triclinic system crystal structure of which the chemical formula is MSi 2 N 2 O 2 M=Ca x Sr y Eu z (x+y+z=1), wherein, when three sides of a unit crystal lattice of the crystal structure are a, b and c and corner angles are α, β and γ, the crystal structure has relationships of a≠b≠c and α≠β≠γ, and wherein, in a, b and c, any one of them is more than twice as much as one of the other two, and the values of the other two are so similar that they do not exceed the double of each, wherein, when molar ratios of Ca, Sr and Eu are x, y and z respectively, x+y+z=1, and wherein when the x, y and z are represented by a triangular projection, the x, y and z are distributed on the lines and at the inside of an area formed by connecting five points of (0.45, 0.55, 0), (0.75, 0.25, 0), (0.75, 0, 0.25), (0.5, 0, 0.5), (0.45, 0.05, 0.5) by a solid line on a triangular diagram.