Spectroscopy and photophysics of self-organized zinc porphyrin nanolayers. 2. Transport properties of singlet excitation

H. Donker, A. van Hoek, W. Schaik, R.B.M. Koehorst, M.M. Yatskou, T.J. Schaafsma

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)

Abstract

Exciton diffusion has been studied in 5-25-nm-thick films of zinc tetra-(p-octylphenyl)-porphyrin (ZnTOPP) spin-coated onto quartz slides by intentional doping with quenchers using steady-state as well as time-resolved fluorescence spectroscopy. The fluorescence spectra of the films are very similar to those of solutions, indicating emission from localized exciton states. From the dependence of the fluorescence quenching on the quencher concentration and fluorescence lifetime measurements, the exciton diffusion can be concluded to be quasi-one-dimensional with an exciton diffusion length of 9 ± 3 nm and an intrastack energy-transfer rate constant of 1011-1012 s-1. From fluorescence anisotropy decay measurements, we conclude that neighboring stacks aggregate in a herringbone structure, forming ordered domains that are randomly oriented in the substrate plane. These measurements indicate an interstack energy-transfer rate constant of (7 ± 2) × 1010 s-1
Original languageEnglish
Pages (from-to)17038-17046
JournalThe Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical
Volume109
Issue number36
DOIs
Publication statusPublished - 2005

Keywords

  • monte-carlo simulation
  • energy-transfer
  • impurity scattering
  • molecular-crystals
  • exciton transport
  • films
  • fluorescence
  • systems
  • phthalocyanine
  • luminescence

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