Excited states of poly(3-octylthiophene) studied by picosecond time-resolved absorption spectroscopy using a streak camera

Takuo Kodaira, Akira Watanabe, Osamu Ito, Motoyuki Watanabe, Haruhisa Saito, Musubu Koishi

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    14 Citations (Scopus)

    Abstract

    The excited states of π-conjugated poly(3-octylthiophene) were studied by laser flash photolysis technique. The nanosecond time-resolved absorption spectra for poly(3-octylthiophene) showed the triplet-triplet (T-T) absorption band (λmax 800 nm) in the near-IR region. The intersystem crossing process was investigated by picosecond time-resolved absorption spectroscopy. The absorption-time profile obtained by picosecond laser flash photolysis of poly(3-octylthiophene) using a streak camera showed an initial rising component just after the photolysis and a slow growing component within a few nanoseconds. They were assigned to excited singlet and triplet states, respectively. The absorption-time profiles were analyzed by curve-fitting considering the decay of the excited singlet state and the growth of the excited triplet state. The intersystem crossing rate constant from the excited singlet state to the excited triplet state was determined to be 1.54 × 109 s-1 by the curve-fitting. The S1-Sn and T-T absorption bands were depicted separately using the fitting parameters.

    Original languageEnglish
    Pages (from-to)15309-15313
    Number of pages5
    JournalJournal of physical chemistry
    Volume100
    Issue number38
    DOIs
    Publication statusPublished - 1996 Sep 19

    ASJC Scopus subject areas

    • Engineering(all)
    • Physical and Theoretical Chemistry

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