Patent ID: 8344402
Filing Date: 2013-01-01
Classification: H01L,Y10T

Abstract:
1. A semiconductor light emitting device comprising: a C plane (0001) sapphire substrate comprising a plurality of protrusions that are disposed on a primary surface of the sapphire substrate in a two-dimensionally repeated pattern; a plurality of GaN-based semiconductor layers epitaxially grown on the sapphire substrate; and an ohmic electrode formed on the GaN-based semiconductor layers, wherein the semiconductor light emitting device is configured so that light generated in the GaN-based semiconductor layers is emitted from the ohmic electrode or the sapphire substrate, the protrusions are configured to scatter or diffract light generated in the semiconductor layers and have a shape of a triangle having sides that are not parallel to A-axis of the GaN-based semiconductor layers in plan view of the sapphire substrate, and in a sectional view of the sapphire substrate side surfaces of the protrusions incline, and an inclination angle of the side surfaces from the primary surface of the sapphire substrate is more than 105 degrees and not more than 150 degrees.