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Emergence of Uranium as a Distinct Metal Center for Building Intrinsic X‐ray Scintillators |
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| Authors: | Yaxing Wang Xuemiao Yin Wei Liu Jian Xie Prof Junfeng Chen Prof Mark A Silver Daopeng Sheng Lanhua Chen Prof Juan Diwu Prof Ning Liu Prof Zhifang Chai Prof Thomas E Albrecht‐Schmitt Prof Shuao Wang |
| Institution: | 1. State Key Laboratory of Radiation Medicine and Protection, School for Radiological and interdisciplinary Sciences (RAD-X), Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, China;2. Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, China;3. Key Laboratory of Transparent Opto-functional Inorganic Materials, Chinese Academy of Sciences, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China;4. Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, USA |
| Abstract: | The combination of high atomic number and high oxidation state in UVI materials gives rise to both high X‐ray attenuation efficiency and intense green luminescence originating from ligand‐to‐metal charge transfer. These two features suggest that UVI materials might act as superior X‐ray scintillators, but this postulate has remained substantially untested. Now the first observation of intense X‐ray scintillation in a uranyl–organic framework ( SCU‐9 ) that is observable by the naked eye is reported. Combining the advantage in minimizing the non‐radiative relaxation during the X‐ray excitation process over those of inorganic salts of uranium, SCU‐9 exhibits a very efficient X‐ray to green light luminescence conversion. The luminescence intensity shows an essentially linear correlation with the received X‐ray intensity, and is comparable with that of commercially available CsI:Tl. SCU‐9 possesses an improved X‐ray attenuation efficiency (E>20 keV) as well as enhanced radiation resistance and decreased hygroscopy compared to CsI:Tl. |
| Keywords: | metal– organic frameworks photoluminescence uranium X-ray scintillation |