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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Formamidinium Lead Halide Perovskite Nanocomposite Scintillators.

Isabel H B Braddock1, Maya Al Sid Cheikh2, Joydip Ghosh1

  • 1Department of Physics, University of Surrey, Guildford GU2 7XH, UK.

Nanomaterials (Basel, Switzerland)
|July 9, 2022
PubMed
Summary

Researchers developed novel perovskite nanocrystal scintillators for radiation detection. These room-temperature synthesized materials offer tunable emission and improved X-ray stopping power for advanced imaging applications.

Keywords:
X-ray imagingformamidinium lead halide (FAPbX3)nanocomposite scintillatorperovskite nanocrystalplastic scintillator

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Radiation Detection

Background:

  • Conventional scintillators face limitations like fixed emission wavelengths, high costs, and poor X-ray stopping power.
  • Plastic scintillators are fast and affordable but possess low atomic numbers, hindering their X-ray attenuation.
  • Formamidinium lead halide perovskite nanocrystals offer high X-ray attenuation and bright luminescence, presenting a promising alternative.

Purpose of the Study:

  • To synthesize tunable, room-temperature processed mixed-halide perovskite nanocrystals for scintillator applications.
  • To fabricate and characterize perovskite-based nanocomposite scintillators for improved performance.
  • To evaluate the potential of these nanocomposites for low-cost X-ray imaging.

Main Methods:

  • Solution-growth method at room temperature to produce mixed-halide FAPbX3 (X = Cl, Br) perovskite nanocrystals.
  • Tuning emission wavelengths (403-531 nm) by adjusting the halide ratio (Cl/Br).
  • Incorporation of FAPbBr3 nanocrystals into PVT-based plastic scintillator matrices and PMMA for nanocomposite fabrication, including surface modification.

Main Results:

  • Achieved tunable violet to green emission with varying halide ratios and observed faster lifetimes with increased chlorine content.
  • Demonstrated brighter luminescence in perovskite/PVT nanocomposites compared to PVT alone.
  • Developed surface-modified composites with improved optical transmission and PMMA-encapsulated composites showing 3.8x higher luminescence intensity but slower decay times.

Conclusions:

  • Mixed-halide formamidinium lead halide perovskite nanocrystals can be synthesized at room temperature with tunable optical properties.
  • Perovskite/plastic nanocomposite scintillators exhibit enhanced luminescence and potential for X-ray imaging.
  • Surface modification and encapsulation strategies can further optimize nanocomposite performance for specific applications.