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Electronic and Optical Properties of Conjugated Polymers$
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William Barford

Print publication date: 2013

Print ISBN-13: 9780199677467

Published to Oxford Scholarship Online: May 2013

DOI: 10.1093/acprof:oso/9780199677467.001.0001

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Excitons in conjugated polymers

Excitons in conjugated polymers

Chapter:
(p.78) 6 Excitons in conjugated polymers
Source:
Electronic and Optical Properties of Conjugated Polymers
Author(s):

William Barford

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199677467.003.0006

Excitons are the primary photo-excited states in conjugated polymers. This chapter develops effective-particle models of excitons in the weak and strong-coupling limits. Excitons are classified as being Mott-Wannier in the weak-coupling limit. This class includes Frenkel, charge-transfer, and Wannier excitons. An exciton wavefunction mapping is introduced that transforms configuration interaction amplitudes into real-space wavefunctions. Excitons are classified as being Mott-Hubbard in the strong-coupling limit. Finally, numerical calculations of the intermediate coupling regime are described.

Keywords:   excitons, Mott-Wannier, Mott-Hubbard, Frenkel excitons, charge-transfer excitons, Wannier excitons, effective-particle models, exciton wavefunctions, configuration interaction

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