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Vibronic Structure of PTCDA Stacks: Monomer-Dimer Equilibrium

Published online by Cambridge University Press:  21 March 2011

Zoltán G. Soos,
Margaret H. Hennessy and
Vladimir Bulovic
Zoltán G. Soos
Affiliation:
Department of Chemistry, Princeton University, Princeton NJ 08544
Margaret H. Hennessy
Affiliation:
Department of Chemistry, Princeton University, Princeton NJ 08544
Vladimir Bulovic
Affiliation:
Department of Electrical Engineering, Princeton University, Prin ceton NJ 08544
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Abstract

Solution spectra of perylenetetracarboxylic dianhydride (PTCDA) show an equilibrium between monomers and dimers, with fluorescence exclusively from monomers and absorption from both. The dimer absorption follows closely the spectrum of PTCDA stacks in crystalline films, which indicate strong coupling to a molecular vibration and mixing of Frenkel and charge-transfer excitons. The same model accounts for solution spectra.

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