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Role of intermolecular coupling in the photophysics of disordered organic semiconductors: Aggregate emission in regioregular polythiophene
Clark, J Silva, C Friend, RH Spano, FC
Clark, J
Silva, C
Friend, RH
Spano, FC
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Journal Article
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2007-05-17
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10.1103/PhysRevLett.98.206406
Abstract
We address the role of excitonic coupling on the nature of photoexcitations in the conjugated polymer regioregular poly(3-hexylthiophene). By means of temperature-dependent absorption and photoluminescence spectroscopy, we show that optical emission is overwhelmingly dominated by weakly coupled H aggregates. The relative absorbance of the 0-0 and 0-1 vibronic peaks provides a powerfully simple means to extract the magnitude of the intermolecular coupling energy, of approximately 5 and 30 meV for films spun from isodurene and chloroform solutions, respectively. © 2007 The American Physical Society.
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Physical Review Letters
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