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

Junsheng Chen, Karel Žï¿½dek, Mohamed Abdellah, Jaber Al Marri, Kaibo Zheng, T�nu Pullerits

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6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number254001
JournalJournal of Physics Condensed Matter
Volume28
Issue number25
DOIs
Publication statusPublished - 11 May 2016
Externally publishedYes

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Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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