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Updated: Aug 26, 2025

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Quantum Confined High-Entropy Lanthanide Oxysulfide Colloidal Nanocrystals.

Brendan Ward-O'Brien1, Paul D McNaughter2, Rongsheng Cai1

  • 1Department of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.

Nano Letters
|October 4, 2022
PubMed
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Researchers created novel quantum confined high-entropy nanoparticles using lanthanide oxysulfides. These nanoparticles exhibit unique optical properties due to their small size and uniform elemental distribution, indicating quantum confinement effects.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Physics

Background:

  • High-entropy (HE) materials offer unique properties due to their complex compositions.
  • Lanthanide oxysulfides (Ln2SO2) are explored as host materials for novel functionalities.
  • Quantum confinement effects in nanomaterials lead to altered optical and electronic properties.

Purpose of the Study:

  • To synthesize and characterize the first quantum confined high-entropy (HE) nanoparticles.
  • To investigate the influence of size and composition on the optical properties of HE lanthanide oxysulfides.
  • To confirm quantum confinement effects through spectroscopic and theoretical analysis.

Main Methods:

  • Simultaneous thermolysis of lanthanide dithiocarbamate precursors in solution.
Keywords:
high entropylanthanide oxysulfidesnanocrystalquantum dot

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  • Powder X-ray diffraction (PXRD) for phase analysis.
  • High-resolution scanning transmission electron microscopy (HR-STEM) with energy dispersive X-ray spectroscopy (EDS) for compositional mapping.
  • UV-Vis absorption and photoluminescence spectroscopy.
  • Theoretical calculations of bandgap energy and exciton Bohr radii.

    • Main Results:

    • Successfully synthesized uniform HE nanoparticles of Ln2SO2 (equimolar Pr, Nd, Gd, Dy, Er).
    • Confirmed uniform distribution of lanthanides within nanoparticles via EDS mapping.
    • Observed a significant blue shift in absorption (edge 330 nm, λmax 410 nm) and photoluminescence spectra compared to bulk material.
    • Spectroscopic data and theoretical analysis support quantum confinement effects due to size, strain, and surface effects.

    Conclusions:

    • Demonstrated the successful synthesis of quantum confined HE nanoparticles in the lanthanide oxysulfide system.
    • Established a correlation between nanoparticle size, composition, and altered optical properties.
    • Provided evidence for quantum confinement in these novel HE nanomaterials, opening avenues for advanced optical applications.