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[International Journal] Enhanced photoluminescence from zinc oxide by plasmonic resonance of reduced graphene oxide
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Kukjoo Kim , Seong Min Lee , Yun Seon Do , Sung Il Ahn , and Kyung Cheol Choi
Journal of Applied Physics, August , 2013
vol 114, no 7, pp 74903
We demonstrate 2.79- and 10.16-fold enhanced photoluminescence (PL) from band-edge and defect levels of zinc oxide (ZnO) using a plasmonic resonance of reduced graphene oxide (RGO) in the UV frequency range. RGO shows superior tunability on the light absorption of ZnO by the confined plasmonic resonance, which results in strong PL emission. We conclude that the absorption of ZnO in close proximity to the RGO layer can be enhanced. These arguments are strongly supported by different PL enhancements depending on the distance between RGO and ZnO layers, time-resolved PL, and numerical calculations.