Lead halide perovskite nanocrystals (LHP-NCs) embedded in a plastic matrix are highly promising for a variety of photonic technologies and are quickly gaining attention as ultrafast, radiation-resistant nanoscintillators for radiation detection. However, advancements in LHP-NC-based photonics are hindered by their well-known thermal instability, which makes them unsuitable for industrial thermally activated mass polymerization processes, crucial for creating polystyrene-based scintillating nanocomposites. In this study, we address this challenge by presenting the first thermal nanocomposite scintillators made from CsPbBr₃ NCs passivated with fluorinated ligands that remain attached to the particles surfaces even at high temperatures, enabling their integration into mass-cured polyvinyl toluene without compromising optical properties. Consequently, these nanocomposites demonstrate scintillation light yields reaching 10 400 photons/MeV, subnanosecond scintillation kinetics, and remarkable radiation resilience, able to withstand γ radiation doses of up to 1 MGy. This performance not only meets but also exceeds the scintillation of plastic scintillators despite the radiation-induced damage to the host matrix.

中文翻译：

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表面改性 CsPbBr3 纳米晶体实现高效超快聚搅拌纳米复合材料闪烁体的自由基热聚合


嵌入塑料基体中的卤化铅钙钛矿纳米晶体 （LHP-NCs） 在各种光子技术中极具前景，并作为用于辐射探测的超快、抗辐射纳米闪烁体迅速受到关注。然而，基于 LHP-NC 的光子学的进步受到其众所周知的热不稳定性的阻碍，这使得它们不适合工业热活化质量聚合工艺，而这对于制造基于聚苯乙烯的闪烁纳米复合材料至关重要。在这项研究中，我们通过提出第一个由 CsPbBr₃ NC 制成的热纳米复合材料闪烁体来应对这一挑战，这些闪烁体用氟化配体钝化，即使在高温下也能保持附着在颗粒表面，使其能够集成到质量固化的聚乙烯醇甲苯中，而不会影响光学性能。因此，这些纳米复合材料表现出高达 10 400 个光子/MeV 的闪烁光产额、亚纳秒闪烁动力学和卓越的辐射弹性，能够承受高达 1 MGy 的γ辐射剂量。这种性能不仅满足而且超过了塑料闪烁体的闪烁，尽管辐射会对宿主基体造成损害。