One- and two-photon fluorescence anisotropy of selected fluorene derivatives

K. D. Belfield, M. V. Bondar, J. M. Hales, A. R. Morales, O. V. Przhonska, K. J. Schafer

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24 Scopus citations


The steady-state excitation anisotropy spectra of fluorene derivatives were measured in viscous solvents, under the one- and two-photon excitation, over a broad spectral range (UV-Visible). The orientation of their absorption transition moments for the first, S 0→S 1, and second, S 0→S 2, excited states were determined. It was shown experimentally that a decrease in the angle between S 0→S 1and S 0→S 2 transitions corresponded to an increased value of two-photon absorption (2PA) cross section for these molecules. Two-photon excitation anisotropy was nearly constant over the spectral region investigated (in contrast to one-photon excitation anisotropy spectra) and can be roughly explained by a simple model of 2PA based on the single intermediate state approximation. For comparison, the same trend in two-photon excitation anisotropy was observed for Rhodamine B inglycerol.

Original languageEnglish (US)
Pages (from-to)3-11
Number of pages9
JournalJournal of Fluorescence
Issue number1
StatePublished - Jan 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Spectroscopy
  • Clinical Biochemistry


  • Fluorene derivatives
  • Steady-state fluorescence
  • Transition dipole moments
  • Two-photon excitation anisotropy


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