Investigations of excitation energy transfer and intramolecular interactions in a nitrogen corded distrylbenzene dendrimer system

O Varnavski, Ifor David William Samuel, LO Palsson, R Beavington, PL Burn, T Goodson

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109 Citations (Scopus)

Abstract

The photophysics of an amino-styrylbenzene dendrimer (A-DSB) system is probed by time-resolved and steady state luminescence spectroscopy. For two different generations of this dendrimer, steady state absorption, emission, and photoluminescence excitation spectra are reported and show that the efficiency of energy transfer from the dendrons to the core is very close to 100%. Ultrafast time-resolved fluorescence measurements at a range of excitation and detection wavelengths suggest rapid (and hence efficient) energy transfer from the dendron to the core. Ultrafast fluorescence anisotropy decay for different dendrimer generations is described in order to probe the energy migration processes. A femtosecond time-scale fluorescence depolarization was observed with the zero and second generation dendrimers. Energy transfer process from the dendrons to the core can be described by a Forster mechanism (hopping dynamics) while the interbranch interaction in A-DSB core was found to be very strong indicating the crossover to exciton dynamics. (C) 2002 American Institute of Physics.

Original languageEnglish
Pages (from-to)8893
Number of pages11
JournalJournal of Chemical Physics
Volume116
Issue number20
DOIs
Publication statusPublished - 22 May 2002

Keywords

  • RESOLVED FLUORESCENCE ANISOTROPY
  • LIGHT-HARVESTING COMPLEX
  • ORGANIC DENDRIMER
  • POLARIZED FLUORESCENCE
  • DYNAMICS
  • MACROMOLECULES
  • LOCALIZATION
  • CHROMOPHORE
  • STILBENE
  • PROBE

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