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Luminescence of Ag2S/SiO2 Colloidal Quantum Dots Decorated with Small Au Nanoparticles

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Abstract

A tenfold increase in the quantum yield of defect luminescence in the region of 750 nm with a simultaneous increase in its decay time from 4 to 200 ns, due to decoration of surface of quantum dots (QDs) Ag2S/SiO2 (5.0 ± 1.5 nm) with Au nanoparticles (NPs) (2.0 ± 0.5 nm). Based on analysis of the luminescence kinetics at temperatures of 77 and 300 K, it was concluded that such a nonspecific manifestation of the plasmon–exciton interaction is caused by the influence of polarization effects from Au NPs on the properties of shallow traps involved in the formation of the defect luminescence kinetics of Ag2S/SiO2 QDs.

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ACKNOWLEDGMENTS

The results of transmission electron microscopy on the Libra 120 microscope were obtained on the equipment of the Center for Collective Use of the Voronezhsky State University.

Funding

The work was supported by the Russian Science Foundation, grant No. 19-12-00266.

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Authors and Affiliations

  1. FSFEI HE Voronezh State University, 394893, Voronezh, Russia

    I. G. Grevtseva, O. V. Ovchinnikov, M. S. Smirnov, T. S. Kondratenko, A. S. Perepelitsa & A. M. H. Hussein

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  1. I. G. Grevtseva
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  2. O. V. Ovchinnikov
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  3. M. S. Smirnov
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  4. T. S. Kondratenko
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  5. A. S. Perepelitsa
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Correspondence to I. G. Grevtseva.

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Translated by N. Petrov

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Grevtseva, I.G., Ovchinnikov, O.V., Smirnov, M.S. et al. Luminescence of Ag2S/SiO2 Colloidal Quantum Dots Decorated with Small Au Nanoparticles. Opt. Spectrosc. 130, 567–572 (2022). https://doi.org/10.1134/S0030400X22120025

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