Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Publication date: 16th December 2024
In recent decades, lead halide perovskites nanocrystals (PNCs), prized for their solution processability, strong light-matter interaction, tunable and high radioluminescence within visible range, are emerging high-atomic number scintillating materials for next generation scintillator/photodetectors for ionizing radiation detection. Innovative strategies for embedding PNCs in impermeable host matrices have been developed [1], These approaches preserve the luminescence properties of the NCs in harsh environments and also prevent Pb dispersion, thus enabling their safe use in biological applications. On the one hand, study reveals the crucial parameters in the design of scintillation detector on isolated NC level [2]. On the other hand, the fundamental question about the scintillation mechanism at nanoscale and the role of particle interaction in high-loading NC solids still remain unclear.
Here we present our work on critical examinations over different embedding strategies of PNCs within mesoporous sillica particles. By dispersing PNC encapsulated mesoporous sillica in non-scintillating solvents, the resulting system offers the possibility to locally enhance PNC concentration, where the electron shower released by one particle may act as a secondary excitation source of other NCs, giving rise to cascading scintillation phenomena.while maintaing a low overall average lead content. Our findings provide a pathway for optimizing PNC-based scintillation systems and offer new insights into exploiting collective behaviors in nanoscale materials. This work contributes to a deeper understanding of state-of-the-art nanocomposite-based nanoscintillators, advancing their potential for scalable and high-performance radiation detection technologies.
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