Scintillators have played an indispensable role in public security and medical diagnosis fields due to their ability to convert X-ray photons into visible light. Metal–organic frameworks (MOFs) have the advantages of designable structures, easy preparation of flexible films and high stability, and hence show great potential in the field of scintillation. However, research on flexible X-ray imaging based on MOF scintillators has been rather limited. The exploration and development of MOF-based flexible scintillation screens would be very promising and exciting. Here, a novel terbium-based MOF (Tb-MOF-1) scintillator was synthesized and employed for X-ray detection and imaging. Benefiting from the sensitizing effect of the ligand, Tb-MOF-1 shows excellent photoluminescence and radioluminescence signals, and its scintillation sensitivity is much higher than that of the commercial scintillator Bi₄Ge₃O₁₂ (BGO). Tb-MOF-1 shows a low X-ray detection limit of 1.71 μGy s⁻¹, which is lower than the demand for medical diagnosis of 5.5 μGy s⁻¹. The scintillation mechanism of Tb-MOF-1 is substantiated using spectroscopy and theoretical calculations. Furthermore, the robust structure of Tb-MOF-1 brings its strong tolerance against water and X-ray dosages, which facilitates its long-term operation. A flexible scintillation screen (Tb-MOF-screen) derived from Tb-MOF-1 was fabricated, achieving a high spatial resolution of 7.7 lp mm⁻¹@MTF 0.2. Ultimately, flexible X-ray imaging tests were successfully carried out by tightly fitting the Tb-MOF-screen to different curvature radii wires, which firstly verifies the X-ray imaging potential of Ln-MOF-based scintillation screens for non-planar objects.

中文翻译：

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应用于柔性 X 射线成像的高灵敏度铽基金属有机框架闪烁体


闪烁体由于能够将 X 射线光子转换为可见光，在公共安全和医疗诊断领域发挥了不可或缺的作用。金属有机框架 （MOF） 具有结构可设计、易于制备柔性薄膜和高稳定性等优点，因此在闪烁领域显示出巨大的潜力。然而，基于 MOF 闪烁体的柔性 X 射线成像的研究相当有限。基于 MOF 的柔性闪烁屏的探索和开发将非常有前途和令人兴奋。在这里，合成了一种新型基于铽的 MOF （Tb-MOF-1） 闪烁体，并用于 X 射线探测和成像。得益于配体的敏化作用，Tb-MOF-1 表现出优异的光致发光和放射发光信号，其闪烁灵敏度远高于商业闪烁体 Bi₄Ge₃O₁₂ （BGO）。Tb-MOF-1 的 X 射线检测限较低，为 1.71 μGy ^s-1，低于医学诊断所需的 5.5 μGy ^s-1。Tb-MOF-1 的闪烁机制使用光谱学和理论计算得到证实。此外，Tb-MOF-1 的坚固结构使其对水和 X 射线剂量具有很强的耐受性，这有利于其长期运行。制备了源自 Tb-MOF-1 的柔性闪烁屏 （Tb-MOF-screen），实现了 7.7 lp ^mm-1@MTF 0.2 的高空间分辨率。 最终，通过将 Tb-MOF 屏幕紧密贴合到不同的曲率半径线上，成功地进行了柔性 X 射线成像测试，首次验证了基于 Ln-MOF 的闪烁屏幕对非平面物体的 X 射线成像潜力。