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Published on: February 25, 2017
Optical dynamics of energy-transfer from a CdZnO quantum well to a proximal Ag nanostructure
1Department of Bioengineering, School of Engineering, University of Tokyo, Tokyo 113-8656, Japan. hiroaki@ee.t.u‑tokyo.c.jp
Abstract:
We studied photoluminescence (PL) and energy-transfer dynamics in a hybrid structure comprising a Cd(0.08)Zn(0.92)O quantum well (QW) and an Ag nanostructure. The observed PL quenching was dependent on the electronic states in the QW. Quenching occurred at low temperature where excited carriers recombined radiatively because of excitonic localization, which disappeared with increasing temperature due to delocalization of excitons. Furthermore, nanostructured Ag surfaces produced local surface plasmon (LSP) absorption that was resonant with the PL peak energy of the QW emission. These results indicate that the recombination energy of excitons transfers nonradiatively to induce LSP excitation, which was revealed using time-resolved PL measurements.

