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Energy transfer and fluorescence depolarization in organic dendrimers and branched molecules
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Paper Abstract

The measurements of the ultra-fast fluorescence anisotropy decay in conjugated dendrimers and in model branched dendritic molecules of different symmetry are reported. The excited state relaxation of carbon and adamantane-centered tetramers was investigated by polarized fluorescence upconversion spectroscopy. Fluorescence anisotropy was found to decay to the residual value in femtosecond time range. A comparison between the tetramer systems and a nitrogen cored distyrylbenzene dendrimer is provided. For the model system bis-MSB representing the linear building block of the investigated systems a fluorescence anisotropy decay time of 82 ps was obtained which agrees with rotational diffusion. Ultrafast anisotropy decay for these branched systems was explained in terms of interchromophore interactions. The results of these ultrafast anisotropy measurements are important to the understanding of the characteristics of excitations in organic dendrimers.

Paper Details

Date Published: 27 February 2002
PDF: 8 pages
Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); doi: 10.1117/12.457467
Show Author Affiliations
Oleg P. Varnavski, Wayne State Univ. (United States)
Jacek Ostrowski, Univ. of California/Santa Barbara (United States)
Guillermo C. Bazan, Univ. of California/Santa Barbara (United States)
Theodore G. Goodson III, Wayne State Univ. (United States)

Published in SPIE Proceedings Vol. 4464:
Organic Light-Emitting Materials and Devices V
Zakya H. Kafafi, Editor(s)

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