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Optics and Spectroscopy, 2020, Volume 128, Issue 12, Pages 1926–1932
DOI: https://doi.org/10.21883/OS.2020.12.50331.206-20
(Mi os235)
 

This article is cited in 4 scientific papers (total in 4 papers)

Optics of low-dimensional structures, mesostructures, and metamaterials

Luminescence quantum yield and recombination constants in colloidal core/shell Ag$_{2}$S/ZnS and Ag$_{2}$S/SiO$_{2}$ quantum dots

O. V. Ovchinnikov, M. S. Smirnov, S. V. Aslanov

Voronezh State University
Full-text PDF (772 kB) Citations (4)
Abstract: The luminescence properties of colloidal Ag$_{2}$S quantum dots (QDs) with ZnS or SiO$_2$ shells coated with thioglycolic or 2-mercaptopropionic acids are comparatively analyzed. It is demonstrated that the quantum yield of the IR recombination luminescence of colloidal Ag$_2$S QDs increases by a factor of up to 35 as a result of formation of ZnS or SiO$_2$ shells with a simultaneous increase in the average luminescence lifetime. It is shown that the radiative and nonradiative recombination constants for core/shell Ag$_{2}$S/ZnS QDs coated with thioglycolic acid decrease, which is explained by localization of electrons in the shell and localization of holes in the core. In core/shell Ag$_{2}$S/SiO$_{2}$ QDs coated with 2-mercaptopropionic acid, the radiative recombination constant increases and the nonradiative recombination constant decreases. In this case, the increase in the radiative recombination constant is caused by localization of electrons and holes in the core. The decrease in the nonradiative recombination constant is explained by passivation of interface defects of QDs upon the shell formation.
Keywords: quantum dots, luminescence, recombination constants, core/shell.
Funding agency Grant number
Russian Science Foundation 19-12-00266
This work was supported by the Russian Science Foundation (project no. 19-12-00266).
Received: 27.07.2020
Revised: 27.07.2020
Accepted: 01.09.2020
English version:
Optics and Spectroscopy, 2020, Volume 128, Issue 12, Pages 2028–2035
DOI: https://doi.org/10.1134/S0030400X2012098X
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: O. V. Ovchinnikov, M. S. Smirnov, S. V. Aslanov, “Luminescence quantum yield and recombination constants in colloidal core/shell Ag$_{2}$S/ZnS and Ag$_{2}$S/SiO$_{2}$ quantum dots”, Optics and Spectroscopy, 128:12 (2020), 1926–1932; Optics and Spectroscopy, 128:12 (2020), 2028–2035
Citation in format AMSBIB
\Bibitem{OvcSmiAsl20}
\by O.~V.~Ovchinnikov, M.~S.~Smirnov, S.~V.~Aslanov
\paper Luminescence quantum yield and recombination constants in colloidal core/shell Ag$_{2}$S/ZnS and Ag$_{2}$S/SiO$_{2}$ quantum dots
\jour Optics and Spectroscopy
\yr 2020
\vol 128
\issue 12
\pages 1926--1932
\mathnet{http://mi.mathnet.ru/os235}
\crossref{https://doi.org/10.21883/OS.2020.12.50331.206-20}
\elib{https://elibrary.ru/item.asp?id=44866921}
\transl
\jour Optics and Spectroscopy
\yr 2020
\vol 128
\issue 12
\pages 2028--2035
\crossref{https://doi.org/10.1134/S0030400X2012098X}
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  • https://www.mathnet.ru/eng/os/v128/i12/p1926
  • This publication is cited in the following 4 articles:
    Citing articles in Google Scholar: Russian citations, English citations
    Related articles in Google Scholar: Russian articles, English articles
    Optics and Spectroscopy Optics and Spectroscopy
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