Patent ID: 8823027
Filing Date: 2014-09-02
Classification: H01L

Abstract:
1. A light emitting device comprising: a substrate; and a hexagonal gallium nitride-based semiconductor layer epitaxially grown on the substrate and having a light emitting layer which contains indium, the substrate including a base and a gallium nitride layer which has a thickness less than a thickness of the base, the gallium nitride layer having a dislocation density of not more than 1×10 the hexagonal gallium nitride-based semiconductor layer being disposed on a principal surface of the gallium nitride layer, an angle between a c-axis of the gallium nitride layer and a normal line to the principal surface of the gallium nitride layer being in a range of not less than 50 degree and not more than 130 degree, wherein, based on the angle range, the light emitting layer emits light with an absolute value of the degree of polarization of not less than 0.2, the base containing a fluorescent material that emits a fluorescent light component which is induced by irradiation of a light component emitted from the light emitting layer, wherein the base comprises a phosphor layer containing the fluorescent material, a support layer being disposed on a principal surface of the phosphor layer, the gallium nitride layer being disposed on a principal surface of the support layer, and a reflective layer which is disposed on the back surface of the phosphor layer, the reflective layer reflecting light which is emitted from the phosphor layer.