20 September 2011 Plasmonically enhanced emission from an inverted GaN light emitting diode
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Abstract
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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Michael A. Mastro, Byung-jae Kim, J. A. Freitas, Joshua D. Caldwell, Ron Rendell, Jennifer Hite, Charles R. Eddy, Jihyun Kim, "Plasmonically enhanced emission from an inverted GaN light emitting diode", Proc. SPIE 8096, Plasmonics: Metallic Nanostructures and Their Optical Properties IX, 809615 (20 September 2011); doi: 10.1117/12.894010; https://doi.org/10.1117/12.894010
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