Silver nanoparticles dispersed on the surface of an inverted GaN LED were found to plasmonically enhance the nearbandedge
emission. The resonant surface plasmon coupling led to a significant enhancement in the exciton decay rate
and the ensemble of nanoparticles provided a mechanism to scatter the coupled energy as free space radiation. The
inverted LED structure employed a tunnel junction to avoid the standard thick p+ GaN current spreading contact layer.
In contrast to a standard design, the top contact was a thin n++ AlGaN layer, which brought the quantum well into the
fringing field of the silver nanoparticles. This proximity allowed the excitons induced within the quantum well to couple
to the surface plasmons, which in turn led to the enhanced band edge emission from the LED.
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