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Ga

Yuemei Li1, Rui Wang1, Wei Zheng1

  • 1School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin , Heilongjiang 150001 , China.

Inorganic Chemistry
|September 11, 2018
PubMed
Summary
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Gallium-doped zinc oxide nanoparticles enhance red light emission and allow for controlled size and shape. These upconversion nanoparticles (UCNPs) show promise for bioimaging applications.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Upconversion nanoparticles (UCNPs) are crucial for bioimaging due to their ability to convert near-infrared light into visible light.
  • Controlling the size, shape, and luminescence properties of UCNPs is essential for optimizing their performance.
  • Transition metal doping offers a pathway to tune UCNP characteristics.

Purpose of the Study:

  • To investigate the effect of Gallium (Ga3+) doping on the properties of ZnO-based upconversion nanoparticles (UCNPs).
  • To enhance red upconversion luminescence (UCL) and control nanoparticle size and shape.
  • To evaluate the potential of Ga3+-doped UCNPs for X-ray imaging in biological applications.

Main Methods:

  • Synthesis of Ga3+-doped ZnO:Yb/Tm (7/0.5 mol %) upconversion nanoparticles.

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  • Utilizing the Stöber method for silica coating of UCNPs (ZnO:Ga/Yb/Tm@SiO2).
  • Characterization of nanoparticle properties including size, shape, and luminescence decay time.

    • Main Results:

    • Ga3+ doping effectively controlled the size and shape of ZnO UCNPs.
    • Red upconversion luminescence (UCL) intensity was significantly enhanced with increasing Ga3+ concentration.
    • Dynamic decay time measurements confirmed the improved luminescence efficiency.
    • Silica-coated nanoparticles (UCNPs@SiO2) enabled visualization of mouse lungs via X-ray imaging.

    Conclusions:

    • Ga3+ doping is a viable strategy for enhancing red UCL and controlling morphology in ZnO UCNPs.
    • The developed ZnO:Ga/Yb/Tm@SiO2 nanoparticles demonstrate potential as effective contrast agents for X-ray bioimaging.
    • This work opens new avenues for UCNP-based biological probes and diagnostic tools.