Radiation detection is of utmost importance in fundamental scientific research, as well as medical diagnostics, homeland security, environmental monitoring and industrial control. Lead halide perovskites (LHPs) are attracting growing attention as high-atomic-number materials for next-generation scintillators and photoconductors for ionizing radiation detection. To unlock their full potential as reliable and cost-effective alternatives to conventional materials, it is necessary for LHPs to conjugate high scintillation yields with emission stability under high doses of ionizing radiation. To date, no definitive solution has been devised to optimize the scintillation efficiency and kinetics of LHPs and nothing is known of their radiation hardness for doses above a few kilograys, to the best of our knowledge. Here we demonstrate that CsPbBr₃ nanocrystals exhibit exceptional radiation hardness for γ-radiation doses as high as 1 MGy. Spectroscopic and radiometric experiments highlight that despite their defect tolerance, standard CsPbBr₃ nanocrystals suffer from electron trapping in dense surface defects that are eliminated by post-synthesis fluorination. This results in >500% enhancement in scintillation efficiency, which becomes comparable to commercial scintillators, and still retaining exceptional levels of radiation hardness. These results have important implications for the widespread use of LHPs in ultrastable and efficient radiation detectors.

辐射检测在基础科学研究以及医学诊断、国土安全、环境监测和工业控制中至关重要。作为用于电离辐射检测的下一代闪烁体和光电导体的高原子序数材料，卤化铅钙钛矿 (LHP) 正受到越来越多的关注。为了充分发挥其作为传统材料的可靠且具有成本效益的替代品的潜力，LHP 有必要将高闪烁产率与高剂量电离辐射下的发射稳定性结合起来。迄今为止，还没有设计出明确的解决方案来优化 LHP 的闪烁效率和动力学，并且据我们所知，对于高于几千戈瑞的剂量，它们的辐射硬度一无所知。在这里，我们证明了 CsPbBr₃纳米晶体在高达 1 MGy 的 γ 辐射剂量下表现出出色的辐射硬度。光谱和辐射实验强调，尽管标准 CsPbBr ₃纳米晶体具有缺陷耐受性，但在致密表面缺陷中存在电子俘获问题，这些缺陷可通过合成后氟化消除。这导致闪烁效率提高了 500% 以上，可与商用闪烁体相媲美，并且仍保持出色的辐射硬度水平。这些结果对于 LHP 在超稳定和高效辐射探测器中的广泛使用具有重要意义。