X-ray detection, which plays an important role in medical and industrial fields, usually relies on inorganic scintillators to con- vert 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.

Thermally activated delayed fluorescence (TADF) organic molecules for efficient X-ray scintillation and imaging / Ma, Wenbo; Su, Yirong; Zhang, Qisheng; Deng, Chao; Pasquali, Luca; Zhu, Wenjuan; Tian, Yue; Ran, Peng; Chen, Zeng; Yang, Gaoyuan; Liang, Guijie; Liu, Tianyu; Zhu, Haiming; Huang, Peng; Zhong, Haizheng; Wang, Kangwei; Peng, Shaoqian; Xia, Jianlong; Liu, Huafeng; Liu, Xu; Yang, Yang. - In: NATURE MATERIALS. - ISSN 1476-1122. - 21:(2022), pp. 210-216. [10.1038/s41563-021-01132-x]

Thermally activated delayed fluorescence (TADF) organic molecules for efficient X-ray scintillation and imaging

Pasquali, Luca;
2022

Abstract

X-ray detection, which plays an important role in medical and industrial fields, usually relies on inorganic scintillators to con- vert 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.
2022
11-nov-2021
21
210
216
Thermally activated delayed fluorescence (TADF) organic molecules for efficient X-ray scintillation and imaging / Ma, Wenbo; Su, Yirong; Zhang, Qisheng; Deng, Chao; Pasquali, Luca; Zhu, Wenjuan; Tian, Yue; Ran, Peng; Chen, Zeng; Yang, Gaoyuan; Liang, Guijie; Liu, Tianyu; Zhu, Haiming; Huang, Peng; Zhong, Haizheng; Wang, Kangwei; Peng, Shaoqian; Xia, Jianlong; Liu, Huafeng; Liu, Xu; Yang, Yang. - In: NATURE MATERIALS. - ISSN 1476-1122. - 21:(2022), pp. 210-216. [10.1038/s41563-021-01132-x]
Ma, Wenbo; Su, Yirong; Zhang, Qisheng; Deng, Chao; Pasquali, Luca; Zhu, Wenjuan; Tian, Yue; Ran, Peng; Chen, Zeng; Yang, Gaoyuan; Liang, Guijie; Liu, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1255683
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