放射发光
纳米晶
闪烁体
动力学
材料科学
闪烁
光电子学
纳米技术
光学
物理
探测器
量子力学
作者
Qinxia Wu,Xinqi Xu,Xiaokun Li,Hao Jiang,Xian Qin,Zhongzhu Hong,Xiaofeng Chen,Zhijian Yang,Xiangyu Ou,Linghai Xie,Yu He,Sanyang Han,Qiushui Chen,Huanghao Yang
标识
DOI:10.1002/anie.202404177
摘要
Long‐lasting radioluminescence scintillators have recently attracted substantial attention from both research and industrial communities, primarily due to their distinctive capabilities of converting and storing X‐ray energy. However, determination of energy‐conversion kinetics in these nanocrystals remaines unexplored. Here we investigate energy funneling kinetics in NaLuF4:Mn2+/Gd3+ nanocrystal sublattices via Gd3+‐driven microenvironment engineering and Mn2+‐mediated radioluminescence profiling. Our photophysical studies reveal effective control of energy‐funneling kinetics and demonstrate the tunability of electron trap depth ranging from 0.66 to 0.96 eV, with the corresponding trap density varying between 2.38 × 105 and 1.34 × 107 cm‐3. This enables controlled release of captured electrons over durations spanning from seconds to 30 days. Furthermore, it allows tailorable radioluminescence emission within the range of 520‐580 nm and fine‐tuning of thermally‐stimulated temperature between 313‐403 K. We further utilize these scintillators to fabricate high‐density, large‐area scintillation screens that exhibit a 6‐fold improvement in X‐ray sensitivity, 22 lp/mm high‐resolution X‐ray imaging, and a 30‐day‐long optical memory. This enables high‐contrast imaging of injured mice through fast thermally‐stimulated radioluminescence readout. These findings offer new insights into the correlation of radioluminescence dynamics with energy funneling kinetics, thereby contributing to the advancement of high‐energy nanophotonic applications.
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