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Aggregate Formation in Pyridine-Based Polymers

Published online by Cambridge University Press:  10 February 2011

J. W. Blatchford,
S. W. Jessen,
L. B. Lin,
T. L. Gustafson,
A. J. Epsteint,
D. K Fu,
H. L. Wang,
T. M. Swager and
A. G. Macdiarmid
J. W. Blatchford
Affiliation:
Department of Physics, The Ohio State University, Columbus, OH 43210
S. W. Jessen
Affiliation:
Department of Physics, The Ohio State University, Columbus, OH 43210
L. B. Lin
Affiliation:
Department of Chemistry, The Ohio State University, Columbus, OH 43210
T. L. Gustafson
Affiliation:
Department of Chemistry, The Ohio State University, Columbus, OH 43210
A. J. Epsteint
Affiliation:
Department of Physics, The Ohio State University, Columbus, OH 43210Department of Chemistry, The Ohio State University, Columbus, OH 43210
D. K Fu
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104
H. L. Wang
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104
T. M. Swager
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104
A. G. Macdiarmid
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104
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Abstract

The spectroscopic properties of the pyridine-based polymer poly(p-pyridyl vinylene p-phenylene vinylene) (PPyVPV) are examined. The emission of PPyVPV in solution has small intrinsic Stokes shift with some vibronic structure. In contrast, emission from thick film samples is featureless, with a strong redshift of ˜0.5 eV versus solution. We attribute these observations to the formation of aggregate states in film samples. Time-resolved photoluminescence measurements are in accord with the diffusion of excitons to the aggregate sites. Photoinduced absorption also originates from excitons in aggregate states.

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References

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