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Concentration quenching of fluorescence of colloid quantum dots of cadmium sulfide

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Abstract

The influence of the concentration of cadmium sulfide nanoparticles in a colloid aqueous solution on its optical properties has been investigated. The band gap of cadmium sulfide nanoparticles is calculated based on the optical absorption spectra of solutions with different concentrations. The band gap coincides for all the samples irrespective of their concentration and is equal to 2.63 eV. It is found that the intensity of fluorescence substantially depends on the solution concentration. The fluorescence intensity considerably decreases in a wavelength range from 665 to 720 nm as the concentration increases above 3.25 mM. This concentration is the threshold of the concentration quenching for CdS nanoparticles.

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Authors and Affiliations

  1. Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, ul. Pervomaiskaya 91, Yekaterinburg, 620990, Russia

    S. V. Rempel, A. A. Podkorytova & A. A. Rempel

  2. Ural Federal University named after the First President of Russia B. N. Yeltsin, ul. Mira 19, Yekaterinburg, 620002, Russia

    S. V. Rempel & A. A. Rempel

Authors
  1. S. V. Rempel
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  2. A. A. Podkorytova
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  3. A. A. Rempel
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Correspondence to S. V. Rempel.

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Original Russian Text © S.V. Rempel, A.A. Podkorytova, A.A. Rempel, 2014, published in Fizika Tverdogo Tela, 2014, Vol. 56, No. 3, pp. 549–552.

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Rempel, S.V., Podkorytova, A.A. & Rempel, A.A. Concentration quenching of fluorescence of colloid quantum dots of cadmium sulfide. Phys. Solid State 56, 568–571 (2014). https://doi.org/10.1134/S1063783414030251

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