Stuttgart 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MO: Fachverband Molekülphysik

MO 21: Poster 3: Cluster, Collisions, Energy Transfer, Photochemistry, Spectroscopy in He-Droplets

MO 21.21: Poster

Donnerstag, 15. März 2012, 16:30–19:00, Poster.IV

Multimode exciton-vibrational spectra of Perylene Bisimide (PBI) molecular aggregates — Sergey Polyutov and •Oliver Kühn — Institut für Physik, Universität Rostock, D-18051 Rostock, Germany

Despite an enormous amount of experimental and theoretical papers focussing on the photophysical properties of molecular aggregates (MA) [1] there are still open questions related to the behavior under varying temperature [2]. In this contribution we investigate the influence of aggregate size, excitonic interactions and exciton-vibrational coupling [3] on absorption and emission spectra of PBI aggregates.

We have studied the multimode electron-vibrational absorption and emission spectra of a PBI monomer and dimer in the region of 600nm. The spectrum was calculated using an exact multimode approach based on explicit treatment of dominating vibrational modes with the largest Huangh-Rhys factors [4]. The calculated energy positions and relative intensities of vibrational peaks well reproduce the experimental spectra [2]. It is shown that changing of temperature of MA may results in a change of aggregate type.

[1] O. Kühn, S. Lochbrunner, Semicond. Semimetals 85, 47 (2012)

[2] S. Wolter, Diploma thesis, Universtät Rostock (2011)

[3] S. Polyutov, O. Kühn, T. Pullerits, Chem. Phys. (2012)

[4] S. Polyutov, I. Minkov, F. Gel'mukhanov, H. Ågren, J. Phys. Chem. A 109, 9507 (2005).