Figure 5From: Improvement of photon extraction efficiency of GaN-based LED using micro and nano complex polymer structures The optical power of the electroluminescence emission of a light emitting diode that was grown on the patterned sapphire substrate with or without micro- and nanoscale complex structures: (a) with respect to wavelength at 20 mA, (b) with respect to current, and (c) with a 60° tilt.Back to article page