X-ray detectors based on scintillators are widely used in the fields of medical imaging, high-energy physics, geological exploration, and industrial detection. The development of scintillation materials with different characteristics has become the focus of considerable research interest. Herein, we report a facile hydrothermal synthesis of Gd- and Eu-codoped LiLuF₄ microcrystals (MCs), which exhibit strong luminescence of Eu³⁺ ion characteristic emission, characterized by distinct red fluorescence emission. The research shows that Gd³⁺ co-doping effectively improved the sensitivity and light yield of LiLuF₄:Eu MCs by regulating the proportion of co-doping ions. In addition, the detection limit is 140.72 nGy s⁻¹ for LiLuF₄:Eu,Gd MCs, approximately 39 times lower than the dose requirement of medical diagnosis. Based on LiLuF₄:Eu,Gd MCs with the superior scintillation properties, a MC-composited film with 250 μm thickness was prepared by a direct coating method. The uniform and high-loading scintillation film exhibits outstanding imaging performance with a high spatial resolution of 14.8 LP mm⁻¹, which confirms the application potential of X-ray imaging.

中文翻译：

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用于高分辨率 X 射线成像的共掺杂改性 LiLuF4:Eu 微晶闪烁体柔性薄膜

基于闪烁体的X射线探测器广泛应用于医学成像、高能物理、地质勘探、工业检测等领域。开发具有不同特性的闪烁材料已成为人们广泛研究兴趣的焦点。在此，我们报道了Gd和Eu共掺杂LiLuF ₄微晶（MC）的简便水热合成，该微晶表现出Eu ³⁺离子特征发射的强发光，其特征在于明显的红色荧光发射。研究表明，Gd ³⁺共掺杂通过调节共掺杂离子的比例，有效提高了LiLuF ₄ :Eu MCs的灵敏度和光产率。此外，LiLuF _{4 :Eu,Gd MCs的检测限为140.72 nGy s} ^-1，比医学诊断所需剂量低约39倍。基于具有优异闪烁性能的LiLuF ₄ :Eu,Gd MCs，采用直接涂覆法制备了厚度为250 μm的MC复合薄膜。均匀且高负载的闪烁膜表现出出色的成像性能，具有14.8 LP mm ^-1的高空间分辨率，证实了X射线成像的应用潜力。