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Behavior of Microstrain in Nd3+-Sensitized Near-Infrared Upconverting Core-Shell Nanocrystals for Defect-Induced
Panchanan Pandey1, Shilpa Tripathi2,3, Manvendra Narayan Singh4
1Department of Chemistry, National Institute of Technology, Rourkela 769008, India.
Nano Letters
|May 3, 2024
Summary
Defects in core-shell nanocrystals optimize upconversion luminescence (UCL). Introducing lithium ions maximized UCL by inducing specific microstrain and atomic disorders in the nanocrystal structure.
Area of Science:
- Materials Science
- Nanotechnology
- Luminescence
Background:
- Upconversion luminescence (UCL) is crucial for various applications.
- Optimizing UCL in core-shell (CS) nanocrystals (NCs) requires understanding lattice dynamics.
- Neodymium (Nd3+)-sensitized CS NCs are promising for near-infrared UCL.
Purpose of the Study:
- To optimize the UCL output of Nd3+-sensitized CS NCs.
- To investigate the role of microstrain and lattice defects on UCL.
- To establish a correlation between structural properties and UCL intensity.
Main Methods:
- High-energy synchrotron X-ray diffraction for microstrain analysis.
- Integral breadth calculation and pair distribution function analysis.
- Systematic incorporation of lithium ions (Li+) to introduce lattice defects.
Main Results:
- Core NCs exhibited compressive microstrain, transitioning to tensile microstrain in the shell.
- A negative lattice mismatch explained the microstrain reversal.
- UCL intensity peaked at specific Li+ concentrations, correlating with extreme microstrain and disorder.
Conclusions:
- Lattice defects, specifically Li+ incorporation, can significantly enhance UCL.
- Microstrain and atomic-level disorders are key factors in tuning UCL output.
- The findings provide a pathway for designing efficient upconverting nanomaterials.
