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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Surface plasmon inhibited photo-luminescence activation in CdSe/ZnS core-shell quantum dots

Author

  • Junsheng Chen
  • Karel Zidek
  • Mohamed Abdellah
  • Mohammed J. Al-Marri
  • Kaibo Zheng
  • Tõnu Pullerits

Summary, in English

In a composite film of Cdx Sey Zn1-x S1-y gradient core-shell quantum dots (QDs) and gold nanorods (NRs), the optical properties of the QDs are drastically affected by the plasmonic nanoparticles. We provide a careful study of the two-step formation of the film and its morphology. Subsequently we focus on QD luminescence photoactivation - a process induced by photochemical changes on the QD surface. We observe that even a sparse coverage of AuNRs can completely inhibit the photoactivation of the QDs' emission in the film. We demonstrate that the inhibition can be accounted for by a rapid energy transfer between QDs and AuNRs. Finally, we propose that the behavior of emission photoactivation can be used as a signature to distinguish between energy and electron transfer in the QD-based materials.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2016-05-11

Language

English

Publication/Series

Journal of Physics: Condensed Matter

Volume

28

Issue

25

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Nano Technology
  • Physical Chemistry
  • Condensed Matter Physics

Keywords

  • energy transfer
  • gold nanorods
  • photoactivation
  • quantum dots
  • surface plasmon

Status

Published

ISBN/ISSN/Other

  • ISSN: 0953-8984