Ultrafast dynamics of förster resonance energy transfer and photo-induced charge transfer in cationic polyfluorene/dye-labeled DNA complex

Kwangseuk Kyhm, Inhong Kim, Mijeong Kang, Han Young Woo

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The ultrafast dynamics of Förster resonance energy transfer (FRET) and photo-induced charge transfer (PCT) has been investigated in an electrostatic complex of a fluorescein-labeled singlestranded DNA (as a FRET acceptor) and a cationic polyfluorene copolymer (as a FRET donor). The donor-acceptor intermolecular distance and total energy transfer efficiency are determined for a polymer/DNA complex with two different counter-ions and compared with those obtained using a theoretical model by considering the competition between FRET and PCT processes. The maximum total energy transfer efficiency (0.47) was estimated at the optimum donor-acceptor intermolecular distance of 39.6 Å.

Original languageEnglish
Pages (from-to)7733-7738
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Volume12
Issue number10
DOIs
Publication statusPublished - 2012 Oct

Keywords

  • Conjugated Polymers
  • Exciton
  • Förster Resonance Energy Transfer (FRET)
  • Optical In-Situ DNA Detection
  • Photo-Induced Charge Transfer
  • Time-Resolved Fluorescence

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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