Energy transfer and fluorescence depolarization in organic dendrimers and branched molecules

Oleg P. Varnavski; Jacek Ostrowski; Guillermo C. Bazan; Theodore G. Goodson III

doi:10.1117/12.457467

27 February 2002 Energy transfer and fluorescence depolarization in organic dendrimers and branched molecules

Oleg P. Varnavski, Jacek Ostrowski, Guillermo C. Bazan, Theodore G. Goodson III

Proceedings Volume 4464, Organic Light-Emitting Materials and Devices V; (2002) https://doi.org/10.1117/12.457467
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

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.

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Oleg P. Varnavski, Jacek Ostrowski, Guillermo C. Bazan, and Theodore G. Goodson III "Energy transfer and fluorescence depolarization in organic dendrimers and branched molecules", Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); https://doi.org/10.1117/12.457467

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