Patent ID: 8866186

Claim:
A Group III nitride semiconductor light-emitting device comprising: a substrate; and a Group III nitride semiconductor layer including a light-emitting layer, stacked on the substrate, wherein the side face of the Group III nitride semiconductor layer is tilted with respect to the normal line of the major surface of the substrate, wherein a cross-section of the Group III nitride semiconductor layer is tilted so as to be narrower toward the substrate, and a dislocation density in the Group III nitride semiconductor layer decreases from the substrate toward a growing direction of the semiconductor layer in the direction vertical to the substrate and the decreased amount is in a range of 10 cm −2 to 10000 cm −2 per thickness of 1.0 μm in the direction vertical to the substrate, a groove is formed on the Group III nitride semiconductor layer at the region of the surface of the light-emitting device where an electrode is not formed, electrodes having the same polarity are formed on both sides of the groove, and another electrode having a polarity opposite to the polarity of the electrodes on both sides of the groove is formed at an outside of the electrodes on both sides of the groove.