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International Journal of Photoenergy
Volume 2006 (2006), Article ID 84950, 7 pages

Low temperature exciton-exciton annihilation in amphi-PIPE J-aggregates

1Department of Physics, University of Potsdam, am Neuen Palais 10, Potsdam 14469, Germany
2BAM, Department of Analytical Chemistry, Berlin 12489, Germany

Received 2 May 2006; Revised 23 August 2006; Accepted 28 August 2006

Copyright © 2006 C. Spitz and S. Daehne. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The mobility of optically excited excitons on J-aggregates can be demonstrated by the phenomena of exciton-exciton annihilation. In this intensity-dependent process the collision of two excitons results in their annihilation and hence in a shortening of the mean excitation lifetime. By measuring the intensity-dependent fluorescent lifetime in contrast to the predicted immobilization of the excitons at low temperature we could prove the excellent mobility of the excitons at a temperature (4K), which is far below their expected freezing point.