Resolving the radical cation formation from the lowest-excited singlet (S-1) state of terthiophene in a TiO2-SiO2 hybrid polymer matrix

M Helbig, A Ruseckas, MML Grage, E Birckner, S Rentsch, Sundstrom

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10 Citations (Scopus)

Abstract

Photoexcitation dynamics of terthiophene (3T) molecules incorporated in an organic-inorganic matrix containing titanium in the network are investigated by polarized transient absorption with femtosecond time resolution. We observed the decay of excited-state absorption of neutral 3T and simultaneous rise of 3T(-)(+.) radical cation absorption. The observed kinetics of electron transfer are independent of excess vibrational energy in the S-1 state, and can be described by a biexponential function with time constants of similar to 1 ps (for similar to 62% of the excited 3T molecules) and similar to 8 ps (for similar to 33%). The angle between the S-1

Original languageEnglish
Pages (from-to)587-594
Number of pages8
JournalChemical Physics Letters
Volume302
Issue number5-6
Publication statusPublished - 26 Mar 1999

Keywords

  • LIGHT-EMITTING-DIODES
  • THIOPHENE OLIGOMERS
  • PHOTOCHEMICAL GENERATION
  • CONJUGATED POLYMERS
  • CHARGE SEPARATION
  • ELECTRON-TRANSFER
  • OLIGOTHIOPHENES
  • SPECTROSCOPY
  • ABSORPTION
  • ULTRAFAST

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