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Optical Trapping of Nanoparticles
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Tunable Defect Engineering in NaYF4 Nanoparticles:Tailoring Trap States for Enhanced NIR-II Bioimaging
Hanlin Wei1, Quan Shen2, Wei Zhou3
1State Key Laboratory for Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
Nano Letters
|October 25, 2025
Summary
Researchers developed cost-effective, high-performance NIR-II luminescent materials using metal ion doping in NaYF4 nanocrystals. This defect engineering strategy boosts near-infrared-II emission for enhanced bioimaging applications.
Area of Science:
- Materials Science
- Nanotechnology
- Biomedical Imaging
Background:
- Second near-infrared window (NIR-II) imaging offers deep tissue penetration and high resolution.
- Current NIR-II materials suffer from high costs, poor photostability, and low emission intensity.
Purpose of the Study:
- To develop cost-effective, high-quantum-yield NIR-II luminescent materials.
- To enhance NaYF4 nanocrystals for improved NIR-II emission via defect engineering.
Main Methods:
- Metal ion doping of NaYF4 nanocrystals.
- Characterization of NIR-II emission under 808/980 nm laser excitation.
- Density functional theory (DFT) calculations to understand defect states and emission pathways.
Main Results:
- Metal-ion-doped NaYF4 exhibited three NIR-II emission peaks at 1057, 1333, and 1523 nm.
- DFT revealed defect states facilitating trap-mediated NIR-II emission.
- Demonstrated superior performance in NIR-II bioimaging.
Conclusions:
- Defect engineering with inexpensive metal ion doping is a viable strategy for cost-effective NIR-II materials.
- The developed nanomaterials show promise for advanced NIR-II bioimaging.
- This approach provides a new pathway for high-performance luminescent materials.
