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Updated: Mar 26, 2026

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Microstructural and optical properties of CdSe/CdS/ZnS core-shell-shell quantum dots.

Dea Uk Lee, Dae Hun Kim, Dong Hyuk Choi

    Optics Express
    |February 3, 2016
    PubMed
    Summary

    Synthesized cadmium selenide/cadmium sulfide/zinc sulfide (CdSe/CdS/ZnS) core-shell-shell quantum dots exhibit efficient photoluminescence. These quantum dots demonstrate a 57% quantum efficiency at 300 K, indicating their potential for optoelectronic applications.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Quantum Dot Research

    Background:

    • Quantum dots (QDs) are semiconductor nanocrystals with size-dependent optical and electronic properties.
    • Core-shell-shell QD structures enhance stability and photoluminescence quantum yield.
    • CdSe/CdS/ZnS represents a promising material system for advanced optoelectronic devices.

    Purpose of the Study:

    • To synthesize and characterize CdSe/CdS/ZnS core-shell-shell quantum dots using a solution process.
    • To investigate the optical properties, including absorption and photoluminescence (PL) spectra.
    • To determine the carrier activation energy and quantum efficiency of the synthesized QDs.

    Main Methods:

    • Solution-phase synthesis of CdSe/CdS/ZnS core-shell-shell quantum dots.

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  • High-resolution transmission electron microscopy (HRTEM) for structural confirmation.
  • Energy dispersive spectroscopy (EDS) for elemental composition analysis.
  • UV-visible absorption and photoluminescence (PL) spectroscopy for optical characterization.
  • Temperature-dependent PL spectroscopy to determine activation energy.

    • Main Results:

    • Successful synthesis of stoichiometric CdSe/CdS/ZnS core-shell-shell quantum dots confirmed by HRTEM and EDS.
    • Dominant excitonic transitions (1S(e)-1S(3/2)(h)) observed in absorption and PL spectra.
    • Photoluminescence mechanism involving carrier relaxation from shell to core states proposed.
    • Carrier activation energy determined to be 200 meV from temperature-dependent PL.
    • An estimated quantum efficiency of approximately 57% at 300 K was achieved.

    Conclusions:

    • CdSe/CdS/ZnS core-shell-shell quantum dots can be effectively synthesized via solution processing.
    • The synthesized QDs exhibit favorable optical properties, including efficient photoluminescence.
    • The observed quantum efficiency suggests potential for applications in lighting, displays, and solar cells.