Patent ID: 8373184
Filing Date: 2013-02-12
Classification: H01L

Abstract:
1. A vertical nitride semiconductor light emitting device comprising: a conductive substrate having first and second opposing sides; a first conductivity-type nitride semiconductor layer; an active layer disposed on the first conductivity-type nitride semiconductor layer; a second conductivity-type nitride semiconductor layer disposed on the active layer; a light scattering layer disposed on the first side of the conductive substrate, the light scattering layer being made of a different material from that of the conductive substrate, the material having a light transmissibility of 70% or more and having a rough pattern disposed on an outer surface to scatter light, wherein the light scattering layer has a refractivity of 1.5 to 2.4, and a critical angle of 36.8 to 73.7; a first electrode disposed on the light scattering layer having a rough pattern, wherein the light scattering layer and the first electrode are disposed on the same side of the conductive substrate; and a second electrode disposed on the second conductivity-type nitride layer, wherein the second electrode is disposed on the second side of the conductive substrate and the second electrode includes a reflective metal layer, wherein the light scattering layer extends from the conductive substrate to at least partially cover sides of the nitride light emitting device.