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Revisiting the optimized doping ratio in core/shell nanostructured upconversion particles.

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  • 1Department of Chemistry and The State Key Laboratory of Molecular Engineering of Polymers and Institute of Biomedicine Science and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200433, P. R. China. fyli@fudan.edu.cn fengweifd@fudan.edu.cn.

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Summary
This summary is machine-generated.

Researchers enhanced rare-earth doped upconversion nanoparticles (RE-UCNPs) by increasing Ytterbium (Yb3+) doping in the core. This 15-fold upconversion luminescence (UCL) boost enables naked-eye guidance for lymphatic vessel resection.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Luminescence

Background:

  • Rare-earth doped upconversion nanoparticles (RE-UCNPs) are crucial for applications requiring enhanced upconversion luminescence (UCL).
  • Core/shell structures improve UCL, but optimizing doping ratios offers further enhancement potential.

Purpose of the Study:

  • To develop a general strategy for significantly enhancing visible UCL in core/shell NaREF4 nanoparticles.
  • To investigate the impact of increasing Ytterbium (Yb3+) doping concentration in the core on UCL intensity.

Main Methods:

  • Synthesized core/shell α-NaYF4:Yb,Er@CaF2 nanoparticles with varying Yb3+ doping concentrations in the core.
  • Analyzed the relationship between Yb3+ doping ratio and UCL intensity.
  • Investigated energy transfer mechanisms, including Yb3+-Yb3+ energy migration, contributing to surface quenching.

Main Results:

  • Achieved a notable 15-fold enhancement in visible UCL by increasing Yb3+ concentration to 98 mol% in the core.
  • Demonstrated that Yb3+-Yb3+ energy migration to surface quenching sites limits optimal doping ratios.
  • Successfully utilized the highly enhanced UCL signal for naked-eye guided lymphatic vessel resection.

Conclusions:

  • Optimizing Yb3+ doping in the core of RE-UCNPs is a viable strategy for significant UCL enhancement.
  • Understanding and mitigating surface quenching through controlled doping is key to maximizing UCL.
  • The developed nanoparticles show promise for advanced biomedical imaging and surgical guidance.