标题： 从弱约束的CsPbBr3纳米晶体中产生的超快协同辐射闪烁 显示英文标题

标题： Ultrafast Superradiant Scintillation from Weakly Confined CsPbBr3 Nanocrystals

摘要： 效率和发射率是辐射探测中的两个传统上相互冲突的参数，同时最大化它们可以显著推动超快飞行时间（ToF）技术的发展。 在本研究中，我们证明通过利用弱受限钙钛矿纳米晶体固有的巨大振子强度（GOS），这一目标是可以实现的，这使得在温和低温条件下产生超辐射闪烁，与ToF技术无缝契合。 我们表明，由于GOS引起的辐射加速涵盖了来自电离相互作用的单激子和多激子动力学，且在80 K时非辐射损失和俄歇复合进一步被抑制。结果是超快闪烁，稀释纳米晶体溶液的寿命为420皮秒，光产率约为10'000光子/MeV，且没有非辐射损失。 对测试平台纳米复合闪烁体的温度依赖性光导实验最终表明，由于GOS导致的带边振子强度积累，光传输能力不受影响。 这些发现表明了一条有前途的路径，用于开发具有优化光输出和时间性能的超快纳米技术闪烁体。 显示英文摘要

摘要： Efficiency and emission rate are two traditionally conflicting parameters in radiation detection, and achieving their simultaneous maximization could significantly advance ultrafast time-of-flight (ToF) technologies. In this study, we demonstrate that this goal is attainable by harnessing the giant oscillator strength (GOS) inherent to weakly confined perovskite nanocrystals, which enables superradiant scintillation under mildly cryogenic conditions that align seamlessly with ToF technologies. We show that the radiative acceleration due to GOS encompasses both single and multiple exciton dynamics arising from ionizing interactions, further enhanced by suppressed non-radiative losses and Auger recombination at 80 K. The outcome is ultrafast scintillation with 420 ps lifetime and light yield of ~10'000 photons/MeV for diluted NC solutions, all without non-radiative losses. Temperature-dependent light-guiding experiments on test-bed nanocomposite scintillators finally indicate that the light-transport capability remains unaffected by the accumulation of band-edge oscillator strength due to GOS. These findings suggest a promising pathway toward developing ultrafast nanotech scintillators with optimized light output and timing performance.