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Updated: Aug 23, 2025

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Graphene Quantum Dots Modified Upconversion Nanoparticles for Photodynamic Therapy.

Yuting Li1, Yufei Wang1, Hong Shang1

  • 1School of Science, China University of Geosciences (Beijing), Beijing 100083, China.

International Journal of Molecular Sciences
|October 27, 2022
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Summary

Researchers developed novel graphene quantum dot-modified upconversion nanoparticles (UCNPs@GQDs) for enhanced photodynamic therapy (PDT). These nanomaterials efficiently generate reactive oxygen species (ROS) under near-infrared light for improved cancer treatment.

Keywords:
graphene quantum dotsphotodynamic therapyphotosensitizerreactive oxygen speciesupconversion nanoparticles

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Photodynamic therapy (PDT) is a promising cancer treatment using reactive oxygen species (ROS) to eliminate malignant cells.
  • Current photosensitizers (PSs) often have limited ROS yield, hindering PDT's therapeutic efficacy and clinical translation.

Purpose of the Study:

  • To develop novel photosensitizers (PSs) for enhanced PDT by overcoming the limitations of existing agents.
  • To synthesize and characterize a new core-shell structured nanomaterial, UCNPs@GQDs, for efficient ROS generation.

Main Methods:

  • Synthesized core-shell structured UCNPs@GQDs by modifying graphene quantum dots (GQDs) onto rare-earth elements doped upconversion nanoparticles (UCNPs).
  • Evaluated the ROS generation efficiency of UCNPs@GQDs under near-infrared light excitation.
  • Assessed the biocompatibility and concentration-dependent PDT efficiency of the synthesized nanomaterials.

Main Results:

  • The UCNPs@GQDs exhibited efficient ROS production under near-infrared light, crucial for triggering the PDT process.
  • The novel UCNPs@GQDs demonstrated high biocompatibility.
  • A clear concentration-dependent relationship was observed for the PDT efficiency of UCNPs@GQDs.

Conclusions:

  • The developed UCNPs@GQDs represent a significant advancement in nanomaterial-based PDT.
  • This new class of photosensitizers shows potential for improved clinical translation in cancer therapy.
  • The study highlights the synergistic benefits of combining UCNPs and GQDs for effective ROS generation in PDT.