Fluorescence dynamics of charge-transfer-complex films of poly(N-vinylcarbazole) and 1,2,4,5-tetracyanobenzene and molecular aspects of the disordered structure

Akira Itaya*, Akira Egawa, Yuuichi Umehara, Hisashi Sakai, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Charge-transfer (CT) fluorescence of poly(N-vinylcarbazole) (PVCz) films doped with 1,2,4,5-tetracyanobenzene was investigated in comparison with exciplex (and/or exterplex) fluorescence of PVCz films doped with 1,4-dicyanobenzene by using the nanosecond time-correlated single-photon-counting method. For excitation of PVCz absorption band and CT absorption band, the fluorescence peak in the time-resolved spectra shifted continuously to short wavelength with time. The direction of the shift was opposite to that of the exterplex fluorescence. The dependence of the steady-state CT fluorescence intensity on concentration of the acceptor was also different from the exciplex system. These different behaviours of fluorescence dynamics between the CT and the exciplex systems were discussed from the viewpoint of the overlap of CT and exterplex fluorescence for the CT system and of a morphological change of PVCz films caused by formation of ground-state CT complexes.

Original languageEnglish
Pages (from-to)3149-3155
Number of pages7
JournalPolymer
Volume35
Issue number15
DOIs
StatePublished - 1 Jan 1994

Keywords

  • charge-transfer complex
  • fluorescence dynamics
  • poly(N-vinylcarbazole)

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