Patent ID: 9028718
Filing Date: 2015-05-12
Classification: C09K,H01L,Y02B

Abstract:
1. A white light emitting device comprising: a light source configured to emit light; and at least one wavelength converting-material configured to absorb at least a part of the light emitted from the light source and configured to emit light having different wavelengths, wherein the white-light emitting device emits white light comprising the light emitted by the wavelength-converting material, a maximum intensity of an emission spectrum of the white light at a wavelength range of 500 nm to 650 nm is not higher than 150% of a minimum intensity in the wavelength range, and said wavelength converting-material comprises at least one green phosphor and comprises at least one red phosphor represented by formula (3): where M is one or more elements selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb; A represents one or two elements selected from the group consisting of divalent metallic elements other than the M; D represents one or more elements selected from the group consisting of quadrivalent metallic elements; E represents one or more elements selected from the group consisting of trivalent metallic elements; X represents one or more elements selected from the group consisting of 0, N, and F; and a, b, c, d, and e are numbers satisfying: 0.00001≦a≦0.1, a+b=1, 0.5≦c≦4, 0.5≦d≦8, 0.8×(⅔+ 4/3×c+d)≦e, and e≦1.2×(⅔+ 4/3×c+d).