Energy efficiency is both, a primary pillar to sustainability of resources and a technological driving force for better, healthier, and more productive lighting for the human environment. Moreover, Photosynthesis and photochemistry are only at the beginning to realize the benefits of low cost, energy efficient generation of light of a particular spectrum. So far the benefits of a wide bandgap pn-junction in GaN has primarily been implemented in 450 – 470 nm blue LEDs. The wavelength range accessible for GaInN/GaN heterostructures in combination with a GaN pn-junction, however, reaches far beyond the blue, namely into the green, yellow, orange, and the red spectral regions. It is due to the relatively higher efficiency of the blue spectral LEDs that current white LED lamps utilize them in combination with various phosphors to supplement other long wavelength portions of the visible spectrum.

© 2012 Optical Society of America

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