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Application of Fluorescence with Polarized Light to Evaluate the Orientation of Dyes Adsorbed in Layered Materials

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A new method of fluorescence polarization is applied to evaluate the angle of the preferential orientation of Rhodamine 6G (R6G) dye adsorbed in supported thin films of Laponite (Lap) clay. The method is based in the determination of the fluorescence dichroic ratio, obtained from the recorded fluorescence spectra with the detection polarizer horizontally and vertically oriented, as a function of the twisted angle of the film around its vertical axis, keeping the excitation polarizer in a fixed direction. The validity of the method is checked by comparing the experimental results obtained with both vertically and horizontally polarized excitations to that previously provided by absorption spectroscopy with linearly polarized light. A preferential orientation angle with respect to the normal to the clay layer of 62° is derived for R6G monomers adsorbed in Lap films.

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ACKNOWLEDGMENTS

This work is supported by the Spanish MEC Minister (research project: MAT2004-04643-C03-02). V. M. M thanks the MECyD Minister for a research grant.

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Authors and Affiliations

  1. Departamento Química Física, Universidad País Vasco EHU, Apartado 644, 48080, Bilbao, Spain

    Virginia Martínez, Sandra Salleres, Jorge Bañuelos & Fernando López Arbeloa

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  1. Virginia Martínez
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  2. Sandra Salleres
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  3. Jorge Bañuelos
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  4. Fernando López Arbeloa
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Correspondence to Fernando López Arbeloa.

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Martínez, V., Salleres, S., Bañuelos, J. et al. Application of Fluorescence with Polarized Light to Evaluate the Orientation of Dyes Adsorbed in Layered Materials. J Fluoresc 16, 233–240 (2006). https://doi.org/10.1007/s10895-005-0042-z

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  • DOI: https://doi.org/10.1007/s10895-005-0042-z

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