Patent ID: 8835967
Filing Date: 2014-09-16
Classification: H01L

Abstract:
1. A nitride-based semiconductor light-emitting device having a light extraction surface, comprising: a semiconductor multilayer structure including an active layer which is made of a nitride semiconductor, a principal surface of the nitride semiconductor being a semi-polar plane or a non-polar plane; an electrode which is configured to reflect at least part of light emitted from the active layer in a direction toward the light extraction surface; a birefringent substrate provided between the light extraction surface and the electrode, the birefringent substrate being configured to transmit light emitted from the active layer and light reflected by the electrode; and a recessed/elevated surface provided between the active layer and the electrode, wherein the following relationship holds true: where Δn is a birefringence of the substrate, d is a thickness of the substrate, λ is an emission wavelength, and a is a natural number, and an angle which is formed between a lateral surface of each of the recessed or elevated portions and a normal line of a principal surface of the active layer, θ1, is not less than 10° and not more than 58°.