Plasmon-enhanced nonradiative energy transfer is demonstrated in two inorganic semiconductor systems. The first is
comprised of colloidal nanocrystal CdTe donor and acceptor quantum dots, while the second is a hybrid InGaN quantum
well-CdSe/ZnS quantum dot donor-acceptor system. Both structures are in a planar geometry. In the first case a
monolayer of Au nanospheres is sandwiched between donor and acceptor quantum dot monolayers. The largest energy
transfer efficiency is seen when the donor is ~3 nm from the Au nanopshere. A plasmon-enhanced energy transfer
efficiency of ~ 40% has been achieved for a separation of 3 nm between the Au nanopshere monolayer and the acceptor
monolayer. Despite the increased energy transfer efficiency these conditions result in strong quenching of the acceptor
QD emission. By tuning the Au nanosphere concentration and Au nanosphere-acceptor QD separation the acceptor QD
emission can be increased by a factor of ~2.8. The plasmon-enhanced nonradiative energy transfer is observed to extend
over larger distances than conventional Forster resonance energy transfer. Under the experimental conditions reported
herein, it can be described by the same d-4 dependence but with a larger characteristic distance. Using a Ag nanobox
array plasmonic component plasmon-enhanced nonradiative energy transfer has also demonstrated from an InGaN
quantum well to a ~80 nm thick layer of CdSe/ZnS colloidal quantum dots. An efficiency of ~27% is achieved, with an
overall increase in the QD emission by ~70%.
L. J. Higgins, X. Zhang, C. A. Marocico, G. P. Murphy, V. K. Karanikolas, Y. K. Gun'ko, V. Lesnyak, N. Gaponik, A. S. Susha, A. L. Rogach, P. J. Parbrook, and A. L. Bradley, "Enhancing Förster nonradiative energy transfer via plasmon interaction," Proc. SPIE 9884, Nanophotonics VI, 98840P (Presented at SPIE Photonics Europe: April 05, 2016; Published: 18 April 2016); https://doi.org/10.1117/12.2229032.
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