Light emitting diodes include a substrate having first and second opposing faces and that is transparent to optical radiation in a predetermined wavelength range and that is patterned to define, in cross-section, a plurality of pedestals that extend into the substrate from the first face towards the...http://www.google.de/patents/US7420222?utm_source=gb-gplus-sharePatent US7420222 - Light emitting diodes including transparent oxide layers
