Fluids, Plasmas and Electric Discharges

Acta Physica Hungarica

, 54:139

First online:

Investigation of anti-Stokes fluorescence in mixed rhodamine 6G—Malachite green systems

  • A. BujkoAffiliated withInstitute of Physics, Technical University
  • , C. BojarskiAffiliated withInstitute of Physics, Technical University
  • , R. BujkoAffiliated withInstitute of Physics, Technical University

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Concentrational changes of the fluorescence quantum yield and emission anisotropy were measured for rhodamine 6G (donor) in the presence of malachite green (acceptor) in glycerin—alcohol solutions, excited in the anti-Stokes and Stokes regions. Reduction of the nonradiative energy transfer efficiency in the case of anti-Stokes excitation was observed. The results of measurements proved to be in good agreement with the theory [10] which allows for a multistep mechanism from donor to acceptor energy transfer for Stokes as well as anti-Stokes excitation. However, in the latter case this agreement could have been obtained for a clearly lower value of the absolute donor fluorescence yield.