Varnavski, O. and Samuel, I. D. W. and Palsson, L. O. and Beavington, R. and Burn, P. L. and Goodson, T. (2002) 'Investigations of excitation energy transfer and intramolecular interactions in a nitrogen corded distrylbenzene dendrimer system.', Journal of chemical physics., 116 (20). pp. 8893-8903.
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 Förster mechanism (hopping dynamics) while the interbranch interaction in A-DSB core was found to be very strong indicating the crossover to exciton dynamics.
|Keywords:||Resolved fluorescence anisotropy, Light-harvesting complex, Organic dendrimer, Polarized fluorescence, Dynamics, Macromolecules, Localization, Chromophore, Stilbene, Probe.|
|Full text:||PDF - Published Version (221Kb)|
|Publisher Web site:||http://dx.doi.org/10.1063/1.1471241|
|Publisher statement:||Copyright (2002) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. Varnavski, O. and Samuel, I. D. W. and Palsson, L. O. and Beavington, R. and Burn, P. L. and Goodson, T. (2002) 'Investigations of excitation energy transfer and intramolecular interactions in a nitrogen corded distrylbenzene dendrimer system.', Journal of chemical physics., 116 (20). pp. 8893-8903. and may be found at http://dx.doi.org/10.1063/1.1471241|
|Record Created:||13 Dec 2006|
|Last Modified:||26 Apr 2011 14:51|
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