闪烁体
荧光
蒽
闪烁
荧光粉
激子
材料科学
量子产额
光子
光电子学
分子
X射线
电子
光学
光化学
物理
化学
探测器
核物理学
量子力学
作者
Wenbo Ma,Yirong Su,Qisheng Zhang,Chao Deng,Luca Pasquali,Wenjuan Zhu,Yue Tian,Peng Ran,Chen Zeng,Gaoyuan Yang,Guijie Liang,Tianyu Li,Haiming Zhu,Peng Huang,Haizheng Zhong,Kangwei Wang,Shaoqian Peng,Jianlong Xia,Huafeng Liu,Xu Liu,Yang Michael Yang
出处
期刊:Nature Materials
[Springer Nature]
日期:2021-11-11
卷期号:21 (2): 210-216
被引量:152
标识
DOI:10.1038/s41563-021-01132-x
摘要
X-ray detection, which plays an important role in medical and industrial fields, usually relies on inorganic scintillators to convert X-rays to visible photons; although several high-quantum-yield fluorescent molecules have been tested as scintillators, they are generally less efficient. High-energy radiation can ionize molecules and create secondary electrons and ions. As a result, a high fraction of triplet states is generated, which act as scintillation loss channels. Here we found that X-ray-induced triplet excitons can be exploited for emission through very rapid, thermally activated up-conversion. We report scintillators based on three thermally activated delayed fluorescence molecules with different emission bands, which showed significantly higher efficiency than conventional anthracene-based scintillators. X-ray imaging with 16.6 line pairs mm−1 resolution was also demonstrated. These results highlight the importance of efficient and prompt harvesting of triplet excitons for efficient X-ray scintillation and radiation detection.
科研通智能强力驱动
Strongly Powered by AbleSci AI