Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.669
Publication date: 16th December 2024
Chemically synthesised semiconductor nanocrystals are gaining momentum as ultrafast nanoscintillators for radiation detection. In particular, quantum-confined lead halide perovsite (LHP) nanocrystals in polymeric matrices combine the high density of Pb-based scintillators with high production scalability, extreme radiation hardness, and unique scintillation properties governed by a multiexciton generation and decay process. This results in competitive efficiencies with Pb-enriched commercial plastic scintillators, improved stability to radiation damage and ultrafast emission lifetimes, largely below 0.5 ns, which promise important advances in fast timing applications from medical tomography to high energy physics. In this talk, I will review the fundamental mechanisms of nanoscale scintillators, highlighting the impact of multi-exciton generation processes and showing how carrier dynamics optical experiments can effectively anticipate particle size effects on both scintillation timing and efficiency. The potential of single nanocrystals is further extended by demonstrating collective scintillation processes made possible by the unique electronic structure of LHP nanocrystals. In addition to isolated nanocrystals, innovative ways to improve performance in high-density plastic matrices and supermolecular nanocrystal architectures will be presented and discussed.
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