Measured Davydov splitting in oligothiophene crystals

Tavazzi, S., Campione, M., Laicini, M., Raimondo, L., Borghesi, A. and Spearman, P. (2006) Measured Davydov splitting in oligothiophene crystals. The Journal of Chemical Physics, 124(19), p. 194710. ISSN (print) 0021-9606

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The polarized absorption spectra of single crystals of oligothiophenes in a wide spectral range are reported. The experimental procedure is discussed, underlying several details which are relevant to obtain reliable spectra particularly for samples of increasing thickness. On the basis of these considerations, it has been possible to fully detect the transition to the upper Davydov exciton originating from the first molecular state. The position and shape of the main exciton peak in these materials are compared and discussed, taking into consideration the molecular arrangement and the longitudinal contribution which depends on the transition moment orientation. The Davydov splitting values as deduced from the experimental data at room temperature are also reported either for the first vibronic replica or for the electronic transition as a whole. The difference between the purely transverse and the measured Davydov splitting is discussed.

Item Type: Article
Uncontrolled Keywords: single-crystals, spontaneous emission, conjugated materials, thin-films, absorption, spectrum, model
Research Area: Chemistry
Faculty, School or Research Centre: Faculty of Science (until 2011)
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Depositing User: Katrina Clifford
Date Deposited: 24 Nov 2009 11:34
Last Modified: 31 Jan 2012 10:14

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