Zhang Zhongyuan, Lu Hao, Zhang Xiong, Xu Xieming, Jiang Xiliang, Wang Shuaihua, Zheng Yi, Huang Xin, Chen Min, Wu Shaofan
College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350117, PR China.
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fuzhou 350002, China.
ACS Appl Mater Interfaces. 2025 Jun 25;17(25):36880-36890. doi: 10.1021/acsami.5c04653. Epub 2025 Jun 11.
Rare-earth fluorides have been shown to be promising scintillators for medical radiography applications. However, they are mostly explored in the alkali metal-based category, and it remains challenging to obtain alkaline-earth-based rare-earth fluoride (ALnF) nanocomposites with high scintillation performance. In this work, rod-shaped BaLuF (BLF) nanocrystals (NCs) are synthesized as a scintillation matrix by a facile liquid-liquid-solid hydrothermal method. Through a lanthanide-doped strategy, Tb-doped BLF NCs exhibit efficient green emission with excellent spectral matching of normal photoelectric conversion devices. The emission performance of Tb-based BLF is enhanced by the effective energy transfer process from Ce D and Tb D. Subsequently, the scintillation performance of prepared BLF:Ce,Tb NCs is assessed, with high X-ray sensitivity, a low detection limit (142.4 nGy s), and a larger relative light output (21 480 photons/MeV), which is 2.4 times higher than that of the commercial scintillator. Furthermore, large-area (25 cm × 25 cm) flexible composite films are further prepared with optimal BLF:Ce,Tb NCs, which show excellent X-ray imaging with a spatial resolution up to 24.6 line pairs mm. These findings demonstrate co-doped ALnF-based nanocomposite scintillators with potential applications in high-resolution industrial nondestructive inspection and biological imaging.
稀土氟化物已被证明是用于医学射线照相应用的有前景的闪烁体。然而，它们大多在碱金属基类别中进行探索，获得具有高闪烁性能的碱土基金属稀土氟化物（ALnF）纳米复合材料仍然具有挑战性。在这项工作中，通过简便的液 - 液 - 固水热法合成了棒状BaLuF（BLF）纳米晶体（NCs）作为闪烁基质。通过镧系元素掺杂策略，Tb掺杂的BLF NCs表现出高效的绿色发射，与普通光电转换器件具有出色的光谱匹配。基于Ce D和Tb D的有效能量转移过程增强了基于Tb的BLF的发射性能。随后，对制备的BLF:Ce,Tb NCs的闪烁性能进行了评估，其具有高X射线灵敏度、低检测限（142.4 nGy s）和较大的相对光输出（2
1480个光子/MeV），比商业闪烁体高2.4倍。此外，用最佳的BLF:Ce,Tb NCs进一步制备了大面积（25 cm×25 cm）柔性复合膜，其在空间分辨率高达24.6线对/mm时显示出优异的X射线成像。这些发现证明了共掺杂的基于ALnF的纳米复合闪烁体在高分辨率工业无损检测和生物成像中的潜在应用。
