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Samokhvalov, P. S., Linkov, P. A., Zvaigzne, M. A., Kosmynceva, A. V., Petrova, I. O., Krivenkov, V. A., Sukhanova, A. V., & Nabiev, I. R. (2018). Optical Properties of Core-Multishell Quantum Dots. KnE Energy, 3(2), 449–455. https://doi.org/10.18502/ken.v3i2.1850

https://doi.org/10.18502/ken.v3i2.1850

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authors

  • P S Samokhvalov
    No author data available.
  • P A Linkov
    No author data available.
  • M A Zvaigzne
    No author data available.
  • A V Kosmynceva
    No author data available.
  • I O Petrova
    No author data available.
  • V A Krivenkov
    No author data available.
  • A V Sukhanova
    No author data available.
  • I R Nabiev
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Published Date

  • Apr 17, 2018

Optical Properties of Core-Multishell Quantum Dots

KnE Energy / The 2nd International Symposium "Physics, Engineering and Technologies for Biomedicine" / Pages 449–455

Abstract

During the past decade, colloidal semiconductor nanocrystals or quantum dots (QDs) have become not only a subject of interesting fundamental research, but also a product for real-life applications. Intense activities devoted to enhancement of QDs photoluminescence (PL) quantum yield (QY), starting from early attempts to deposit protective ZnS shells atop CdSe cores, have resulted in novel designs of core-shell QDs with 100% PL QY. In this work we present a detailed analysis of optical properties of core-“multishell” (MS) QDs, whose physical structure is specifically designed to attain maximum localization of excited charge carriers inside luminescent cores, and thereby to achieve 100% PL QY. We have produced samples of core-MS QDs having 3 to 7 shell monolayers, studied the evolution of optical transitions in such QDs during the process of shell deposition, and analyzed the effects of shell thickness on the optical properties of finally obtained QDs. Specifically, studies of PL lifetimes have revealed the possibility of alternative emission mechanism, based on delayed charge carrier transfer from excited outer CdS layer of the multishell into CdSe cores.


Keywords: quantum dots, core-shell, multishell, SILAR

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