Patent ID: 8188495

Claim:
A light emitting device comprising a sapphire substrate having a C-plane upper surface and a gallium nitride-based compound semiconductor layer formed on the upper surface of the substrate, wherein a planar projection shape of said light-emitting device is a rectangular shape with rectangular long and short sides each having a different length, said light emitting device having a side end surface at each of the rectangular long sides and a side end surface at each of the rectangular short sides, a side end surface at a rectangular long side of the gallium nitride-based compound semiconductor layer corresponds to a plane direction of A-plane in a gallium nitride single crystal lattice, and the side end surface of the rectangular long side of the gallium nitride-based compound semiconductor layer corresponding to a plane direction of A-plane is inclined with respect to a principal surface of the substrate such that a cross sectional area of the gallium nitride-based compound semiconductor layer parallel to the principle substrate surface becomes smaller towards the principle substrate surface, and wherein an angle θ between the inclined side surface of the gallium nitride-based compound semiconductor layer and a principle surface of the substrate is less than 90° .