Spin-orbit coupling and intersystem crossing in conjugated polymers: A configuration interaction description

D. Beljonne*, Z. Shuai, G. Pourtois, J. L. Bredas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

248 Scopus citations

Abstract

Configuration-interaction calculations are performed to describe the singlet and triplet excited states of oligothiophene and oligo(phenylene ethynylene) conjugated chains. Intersystem crossing from the singlet to the triplet manifold is made possible by spin-orbit coupling, which leads to a mixing of the singlet (Sn) and triplet (Tn) wave functions. The electronic spin-orbit S1-Ti- matrix elements, obtained from first-order perturbation theory, are used to compute the rates of intersystem crossing from the lowest singlet excited state, S1, into low-lying triplet states, Ti-. On the basis of these results, a general mechanism is proposed to describe the intersystem crossing process in conjugated oligomers and polymers. The roles of chain length, heavy-atom derivatization, and ring twists are evaluated.

Original languageEnglish (US)
Pages (from-to)3899-3907
Number of pages9
JournalJournal of Physical Chemistry A
Volume105
Issue number15
StatePublished - Apr 19 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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