Förster resonance energy transfer in mixed-size CdTe quantum dots with optimized donor-acceptor concentration ratio

Y. C. Lin, Wu-Ching Chou, A. S. Susha, A. L. Rogach

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

The dynamics of Förster resonance energy transfer (FRET) in mixed-size water-soluble CdTe quantum dots (QDs) are studied by using photoluminescence (PL) and time-resolved PL spectroscopy. When donor concentration is increased, an enhancement of both the FRET and quantum efficiency in the mixed-size CdTe QDs films can be observed. Increasing donor concentration significantly quenches the emission intensity and lifetime in donor QDs and enhances that in acceptor QDs. However, as D/A ratios exceed 6, the emission intensity and the lifetime of acceptor QDs start to decline, reflecting a decreasing in both quantum and FRET efficiency due to a markedly declining availability of acceptor QDs.

Original languageEnglish
Title of host publicationUltrafast Phenomena in Semiconductors and Nanostructure Materials XV
DOIs
StatePublished - 2 May 2011
EventUltrafast Phenomena in Semiconductors and Nanostructure Materials XV - San Francisco, CA, United States
Duration: 23 Jan 201126 Jan 2011

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7937
ISSN (Print)0277-786X

Conference

ConferenceUltrafast Phenomena in Semiconductors and Nanostructure Materials XV
CountryUnited States
CitySan Francisco, CA
Period23/01/1126/01/11

Keywords

  • cadmium compounds
  • energy transfer
  • II-VI semiconductors
  • nanocrystals
  • nonradiative transitions
  • photoluminescence
  • radiative lifetimes
  • semiconductor quantum dots
  • tellurides
  • time-resolved spectra

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