Nanostructured scintillators, renowned for their exceptional miniaturization and portability, are typically designed with homogeneous dopant ion concentration profiles. While these profiles facilitate consistent optical properties, they may pose challenges in terms of compromising light emission intensity and overall scintillation efficiency. A pressing issue in the field of X‐ray flat‐panel minidetectors is the lack of specific and innovative strategies to significantly enhance radioluminescence capabilities, which has hindered further advancements. This research showcases an efficacious strategy for synthesizing ligand‐exchange‐passivated mixed‐halide double perovskite nanocrystals (NCs) tailored for their remarkable scintillation capabilities. The mixed‐halide composition is fine‐tuned via anion exchange between Bi3+ and Tb3+‐doped Cs2AgInCl6 NCs and potassium bromide (KBr). Additionally, the initial oleic acid ligands are substituted with 1‐dodecanethiol (1‐DT), effectively compensating for inherent halogen vacancies and mitigating halide ion migration. The underlying passivation mechanism is elucidated through a comprehensive approach that combined spectroscopic experiments and theoretical calculations. Consequently, the fabricated transparent scintillator films, incorporating synthesized mixed‐halide double perovskite NCs, exhibit a high light yield of ≈20 952 photons MeV−1, a sensitive detection limit of 207.5 nGyair s−1, exceptional spatial resolution of 8.1 lp mm−1, and unparalleled stability under prolonged X‐ray irradiation.

中文翻译：

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用于 X 射线成像的配体交换钝化混合卤化物双钙钛矿纳米晶中的缺陷


纳米结构闪烁体以其卓越的小型化和便携性而闻名，通常设计为具有均匀的掺杂离子浓度曲线。虽然这些轮廓有助于保持一致的光学特性，但它们可能会在影响光发射强度和整体闪烁效率方面带来挑战。X 射线平板微型探测器领域的一个紧迫问题是缺乏特异性和创新策略来显着增强放射发光能力，这阻碍了进一步的进步。这项研究展示了一种合成配体交换钝化混合卤化物双钙钛矿纳米晶体 （NC） 的有效策略，该纳米晶体因其卓越的闪烁能力而量身定制。混合卤化物组成通过 Bi3+ 和 Tb3+ 掺杂的 Cs2AgInCl6 NC 和溴化钾 （KBr） 之间的阴离子交换进行微调。此外，初始油酸配体被 1-十二硫醇 （1-DT） 取代，有效补偿固有的卤素空位并减轻卤化物离子迁移。通过结合光谱实验和理论计算的综合方法阐明了潜在的钝化机制。因此，结合合成的混合卤化物双钙钛矿 NC 制造的透明闪烁体薄膜表现出 ≈20 952 光子 MeV-1 的高光产率、207.5 nGyair s-1 的灵敏检测限、8.1 lp mm-1 的出色空间分辨率，以及在长时间 X 射线照射下无与伦比的稳定性。