Semiconductor light emitting devices, such as light emitting diodes, include a substrate, an epitaxial region on the substrate that includes a light emitting region such as a light emitting diode region, and a multilayer conductive stack including a reflector layer, on the epitaxial region. A barrier...http://www.google.se/patents/US7611915?utm_source=gb-gplus-sharePatent US7611915 - Methods of manufacturing light emitting diodes including barrier layers/sublayers
