Ultrafast and Radiation-Hard Lead Halide Perovskite Nanocomposite Scintillators

Area of Science:

• Materials Science
• Nanotechnology
• Radiation Detection

Background:

• Lead halide perovskite nanocrystals (LHP-NCs) show promise as scintillators for ionizing radiation detection.
• Current limitations include challenges in scalable synthesis and composite integration, hindering widespread application.
• Understanding scintillation mechanisms is crucial for optimizing LHP-NC performance.

Purpose of the Study:

• To develop large-scale, high-performance nanocomposite scintillators using CsPbBr₃ nanocrystals (NCs).
• To address limitations in synthesis scalability and material integration for LHP-NC scintillators.
• To elucidate the fundamental scintillation mechanisms in these novel materials.

Main Methods:

• A novel, low-waste, room-temperature turbo-emulsification method for synthesizing CsPbBr₃ NCs.
• In situ transformation of NCs during mass polymerization to create polyacrylate nanocomposites.
• Ultrafast radioluminescence and optical spectroscopy using pulsed synchrotron light.

Main Results:

• Achieved nanocomposite scintillators with >90% luminescence efficiency and exceptional radiation hardness.
• Demonstrated a scintillation yield of 4800 ph/MeV at low NC loading.
• Observed ultrafast response times with >30% scintillation in the first 80 ps.
• Identified charged-exciton and multiexciton recombination as key scintillation mechanisms.

Conclusions:

• The developed method enables scalable, high-performance LHP-NC scintillators with enhanced structural integrity and optical properties.
• The study provides fundamental insights into scintillation kinetics, highlighting the role of nonradiative Auger decay.
• These findings pave the way for advanced applications in precision medicine and high-energy physics.