The Low-Lying Excited States of Luminescent Conjugated Polymers: Theoretical Insight into the Nature of the Photogenerated Species and Intersystem Crossing Processes

J. Cornil*, D. Beljonne, Alan J. Heeger, Jean-Luc Bredas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In this contribution, we first discuss the nature of the primary photoexcited species in the lowest excited state of luminescent conjugated polymers (for instance, polyparaphenylene vinylene, PPV) on the basis of quantum-chemistry calculations including both electron-phonon coupling and electron-electron interactions. We conclude that electronic excitations in long PPV chains lead to the formation of weakly bound polaron-excitons, in agreement with a large number of recent experimental measurements. We then describe singlet and triplet excited states in oligothiophenes and point to the importance of intersystem crossing as an efficient nonradiative decay process of the singlet excitations.

Original languageEnglish (US)
Pages (from-to)308-321
Number of pages14
JournalACS Symposium Series
Volume672
StatePublished - Dec 1 1997

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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