Hostname: page-component-5db6c4db9b-5lzww Total loading time: 0 Render date: 2023-03-25T05:53:03.012Z Has data issue: true Feature Flags: { "useRatesEcommerce": false } hasContentIssue true

The Ultrafast Dynamics of Electronic Excitations in Pentacene Thin Films

Published online by Cambridge University Press:  01 February 2011

Henning Marciniak
Affiliation:, Universität Rostock, Institut für Physik, Rostock, Germany
Bert Nickel
Affiliation:, CeNS, Munich, Germany
Stefan Lochbrunner
Affiliation:, Universität Rostock, Institut für Physik, Rostock, Germany
Get access


Pentacene films which are model systems for organic electronics exhibit contrary to the pentacene monomer extremely little photoluminescence. This points to an ultrafast relaxation mechanism. We apply pump-probe absorption spectroscopy with a time resolution of 30 fs to microcrystalline pentacene films. It is found that the primarily excited Frenkel excitons decay within 70 fs to a non fluorescing singlet species. Contrary to expectations fission into triplets is only a minor channel. We propose that the ultrafast relaxation of the photoexcited excitons leads to a species very similar to excimers. The radiative transition of the excimer to the ground state is electric dipole forbidden due to symmetry reasons. The excimer formation provides therefore an efficient mechanism to turn off the emission.

Research Article
Copyright © Materials Research Society 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)



1 Dimitrakopoulos, C. D., Purushothaman, S., Kymissis, J., Callegari, A., and Shaw, J. M., Science 283, 822 (1999).CrossRefGoogle Scholar
2 Nickel, B., Fiebig, M., Schiefer, S., Gllner, M., Huth, M., Erlen, C., and Lugli, P., Phys. Status Solidi A 205, 526 (2008).CrossRefGoogle Scholar
3 Jundt, C., Klein, G., Sipp, B., Moigne, J. Le, Joucla, M., and Villaeys, A. A., Chem. Phys. Lett. 241, 84 (1995).CrossRefGoogle Scholar
4 Lee, K. O. and Gan, T. T., Chem. Phys. Lett. 51, 120 (1977).CrossRefGoogle Scholar
5 Marciniak, H., Pugliesi, I., Nickel, B., and Lochbrunner, S., Phys. Rev. B, 79, 235318 (2009).CrossRefGoogle Scholar
6 Marciniak, H., Fiebig, M., Huth, M., Schiefer, S., Nickel, B., Selmaier, F., and Lochbrunner, S., Phys. Rev. Lett. 99, 176402 (2007).CrossRefGoogle Scholar
7 Pope, M., Geacintov, N. E., and Vogel, F., Mol. Cryst. Liq. Cryst. 6, 83 (1969).Google Scholar
8 Hellner, C., Lindqvist, L., and Rodberge, P. C., J. Chem. Soc., Faraday Trans. 1 68, 1928 (1972).CrossRefGoogle Scholar
9 Schiefer, S., Huth, M., Dobrinevski, A., and Nickel, B., J. Am. Chem. Soc. 129, 10316 (2007).CrossRefGoogle Scholar