Title

One- And Two-Photon Fluorescence Anisotropy Of Selected Fluorene Derivatives

Keywords

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

Abstract

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. © 2005 Springer Science + Business Media, Inc.

Publication Date

1-1-2005

Publication Title

Journal of Fluorescence

Volume

15

Issue

1

Number of Pages

3-11

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/s10895-005-0207-9

Socpus ID

17444385289 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/17444385289

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