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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
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Heterogeneous Oxysulfide@Fluoride Core/Shell Nanocrystals for Upconversion-Based Nanothermometry.

Qilin Zou1,2, Cécile Marcelot2, Nicolas Ratel-Ramond2

  • 1Laboratoire des IMRCP, CNRS UMR 5623, Université de Toulouse - UPS, 118 route de Narbonne, 31062 Toulouse Cedex 09, France.

ACS Nano
|July 21, 2022
PubMed
Summary

We developed ultrasmall lanthanide-doped upconversion nanoparticles (UCNPs) with enhanced luminescence. The core/shell heterostructure significantly boosts upconversion luminescence (UCL) efficiency for potential applications.

Keywords:
Lanthanide-doped nanoparticlesheterostructurelattice strainquantum yieldtemperature sensingupconversion

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Area of Science:

  • Nanomaterials Science
  • Inorganic Chemistry
  • Photonics

Background:

  • Lanthanide-doped upconversion nanoparticles (UCNPs) are crucial for various applications, but ultrasmall UCNPs (<10 nm) exhibit weak luminescence.
  • Enhancing the upconversion luminescence (UCL) efficiency of ultrasmall UCNPs is critical for their practical implementation.

Purpose of the Study:

  • To develop ultrasmall lanthanide-doped oxysulfide@fluoride core/shell heterostructures with improved UCL efficiency.
  • To investigate the potential of these UCNPs for nanothermometry applications.

Main Methods:

  • Epitaxial heterogeneous growth of a β-NaYF4 shell onto ultrasmall Gd2O2S:Ln3+ cores.
  • Characterization of UCL intensity, luminescence decay time, and upconversion quantum yield (UCQY).
  • Estimation of thermal sensitivities for nanothermometry.

Main Results:

  • Gd2O2S@NaYF4 core/shell UCNPs demonstrated over 800-fold (Yb/Tm) and 5000-fold (Yb/Er) increases in UCL intensity compared to their respective cores.
  • UCQY values reached 0.76% (Yb/Tm) and 0.61% (Yb/Er).
  • Demonstrated potential for nanothermometry applications with estimated thermal sensitivities.

Conclusions:

  • The developed oxysulfide@fluoride core/shell heterostructure effectively enhances UCL in ultrasmall UCNPs.
  • These UCNPs show promise for advanced applications, including temperature sensing.