Patent ID: 9281456
Filing Date: 2016-03-08
CPC Classification: C09K,H01J,H01L

Claim Text:
1. A light-emitting device, comprising: a light-emitting element for emitting primary light; and a wavelength conversion unit for absorbing part of the primary light and emitting secondary light having a wavelength longer than that of the primary light, wherein said wavelength conversion unit includes plural kinds of phosphors different in light absorption characteristic from each other, at least one kind of phosphor among said plural kinds of phosphors has an absorption characteristic that can absorb the secondary light emitted by at least another kind of phosphor among said plural kinds of phosphors, and said plural kinds of phosphors have median sizes different from each other, by mixing wavelength components of the primary light emitted from said light-emitting element and wavelength components of the secondary light emitted from said plural kinds of phosphors, the light-emitting device emits light at a chromaticity regarded as blackbody radiation at a prescribed color temperature, said light-emitting element is formed of a gallium nitride-based semiconductor, and said primary light has a peak wavelength in the range from 380 nm to 500 nm, said wavelength conversion unit includes a combination of a phosphor for emitting blue light, a phosphor for emitting green light and a phosphor for emitting red light, and said phosphor for emitting blue light includes at least one kind selected from