Photoinduced electron transfer and hole migration along copolymer of vinylbenzenepyrrolidinofullerene[60] and N-vinylcarbazole

Takuro Midorikawa, Yasuyuki Araki, Mamoru Fujitsuka, Osamu Ito

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Photoinduced electron-transfer and hole-migration processes for newly prepared copolymers of C 60 and /V-vinylcarbazole (VCz) with the several compositions have been investigated using time-resolved fluorescence and absorption methods. Shortening of fluorescence lifetime of the C 60 moiety in PVCz-C 60 was observed, suggesting that the charge-separation takes place via the excited singlet state of C 60; the rate constants of the charge-separation were evaluated to be larger than 10 9 s -1 in polar solvents. In the nanosecond transient absorption spectra in the visible and near-IR regions obtained by excitation of the C 60 moiety, the generation of PVCz •+-C •- 60 was confirmed. The time profiles of these radical ions showed slow decay continuing more than 800 μs in polar solvents. From the simulations of the decay curves on the basis of the proposed kinetic model, in which the charge-recombination takes place competitively with hole-migration, the rate parameters have been evaluated; i.e., the rate constant of hole migration was evaluated to be 5 × 10 7 s -1, which was 50 times faster than that of the charge-recombination (ca. 10 6 s -1) in polar solvent. The charge-recombination takes place after hole migration among 200-300 Cz units along the PVCz chain in PVCz-C 60

Original languageEnglish
Pages (from-to)1419-1426
Number of pages8
JournalJournal of Nanoscience and Nanotechnology
Volume7
Issue number4-5
DOIs
Publication statusPublished - 2007 Apr 1

Keywords

  • Electron transfer
  • Fullerene[60]
  • Hole migration
  • Laser photolysis
  • Polyvinylcarbazole

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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