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Annu Rev Phys Chem. 2006;57:217-43.

Excitons in conjugated oligomer aggregates, films, and crystals.

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  • 1Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, USA. spano@temple.edu

Abstract

Recent experimental and theoretical investigations of excitons in conjugated oligomer nanoaggregates, thin films, and crystals are reviewed. The review focuses on the technologically important unsubstituted oligo-phenylene vinylenes (OPVn) and oligo-thiophenes (OTn), which exhibit side-by-side herringbone crystal packing. Many of the salient photophysical properties displayed by OPVn and OTn solid phases, including the large Davydov splitting, the rich variety of peaks due to vibronic coupling in both absorption and emission, and the unusual behavior of the emission origin, are accounted for in a model including excitonic coupling between molecules, linear exciton-phonon coupling, and disorder.

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