Patent ID: 8659039
Filing Date: 2014-02-25
Classification: H01L

Abstract:
1. A semiconductor light emitting diode, comprising: a substrate having a ridge-shaped surface comprising a plurality of ridges, each ridge extending in an in-plane direction and consisting of a top facet and two facets inclined to the top facet, the two inclining facets being joined respectively to opposite edges of the top facet; a first conductivity-type barrier layer stacked on the ridges of the substrate; an active layer stacked on the first conductive-type barrier layer and serving as a light emitting layer; and a second conductivity-type barrier layer stacked on the active layer and defining an outermost surface of the semiconductor light emitting diode which contacts atmospheric air and serves as a light-extraction surface; wherein the active layer and first and second conductivity-type barrier layers are grown epitaxially from the ridges of the substrate and each have upper surfaces that are ridge-shaped, each ridge of each of the upper surfaces comprising a top facet and two facets inclined to the top facet, the two inclining facets being joined respectively to opposite edges of the top facet; wherein the top facet of the light extraction surface has a width (W) of 2λ (λ: light emission wavelength) or less; and wherein the active layer is positioned such that a center (C) of each top facet of the active layer defines a point on the inclined facet of the light-extraction surface that has a shortest distance to the center (C), the point being a location where light emitted from the center (C) of the top facet of the active layer suffers total internal reflection, and a distance (L) between the point and an edge of the top facet of the light extraction surface is λ or less.