期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 26, 页码 7883-7887出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201802865
关键词
metal-organic frameworks; photoluminescence; uranium; X-ray scintillation
资金
- Science Challenge Project [TZ2016004]
- National Natural Science Foundation of China [21790370, 21790374, 21761132019]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Young Thousand Talented Program in China
- Center for Actinide Science and Technology (CAST), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0016568]
The combination of high atomic number and high oxidation state in U-VI 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 U-VI 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.
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