Fluorescence up-conversion study of excitation energy transport dynamics in oligothiophene - Fullerene linked dyads

Takumi Nakamura, Yasuyuki Araki, Osamu Ito, Kazuo Takimiya, Tetsuo Otsubo

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Photoinduced excitation energy transport dynamics in oligothiophene- fullerene linked dyads, nT-C60 (n = 4, 8, and 12), have been investigated by femtosecond fluorescence up-conversion. In 8T-C60 and 12T-C60, each time profile of the fluorescence due to the 1nT* moiety consists of two components. The sub-picosecond component and a few picosecond components were experimentally evaluated depending on the lengths of oligothiophenes (n =8 and 12) and on the analyzing wavelength of the fluorescence. However, the time trace of the fluorescence due to 14T*-C60 decayed with a single short component in ∼300 fs due to direct excited energy transfer (EET) from the 14T* moiety to the C60 moiety. On the basis of the kinetic models considering the short and long locally π-conjugative thiophene segments in 8T-C60 and 12T-C60, the rate parameters of the elemental processes were evaluated. Sub-picosecond time constants of nT-C60 were found to be EET from the thiophene segment vicinal to the C60 moiety and intrachain energy transfer. Slower picosecond dynamics mainly corresponds to EET from the thiophene segments apart from the C60 moiety.

Original languageEnglish
Pages (from-to)1125-1132
Number of pages8
JournalJournal of Physical Chemistry A
Volume112
Issue number6
DOIs
Publication statusPublished - 2008 Feb 14

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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