Abstract
Nonradiative resonance energy transfer in hydrophilic hybrid associates of thionine molecules (TH+) with colloidal Ag2S quantum dots (QDs) with average diameter of 3.5 nm was studied. Photoluminescence spectra and its decay shown that for these systems the supplemental photosensitization of recombination luminescence of Ag2S QDs (1200 nm) from the region of TH+ fluorescence (618 nm) is possible. It was found that the average lifetime of TH+ molecules luminescence is shortened during their association with Ag2S QDs. Approximation of luminescence decay by stretched exponent with value of parameter β = 0.5 indicates on the inductive-resonance dipole-dipole (Förster) mechanism of nonradiative energy transfer (FRET). The efficiency of FRET was 0.29–0.41.
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Acknowledgements
FRET regularity were investigated within the framework of RFBR (project 15-02-04280-a).
The development of method of the formation and spectral interpretation the formation of associates of quantum dots with dye molecules were realized with partial support of the Presidential Grant -1161.2015.4.
The development of a technique of the picosecond luminescence kinetics for studied systems was realized within the framework of RFBR (project 16-02-00594 A).
Results of structural investigations (TEM, XRD) were obtained on the equipment of the Center of collective usage of scientific equipment of Voronezh State University.
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Ovchinnikov, O.V., Smirnov, M.S., Kondratenko, T.S. et al. Förster resonance energy transfer in hybrid associates of colloidal Ag2S quantum dots with thionine molecules. J Nanopart Res 19, 403 (2017). https://doi.org/10.1007/s11051-017-4093-2
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DOI: https://doi.org/10.1007/s11051-017-4093-2