Emergence of Uranium as a Distinct Metal Center for Building Intrinsic X-ray Scintillators
Emergence of Uranium as a Distinct Metal Center for Building Intrinsic X-ray Scintillators
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DOI：
10.1002/anie.201802865
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发表时间：
2018-06-25
影响因子：
16.6
通讯作者：
Wang, Shuao
中科院分区：
文献类型：
--
作者：
Wang, Yaxing;Yin, Xuemiao;Wang, Shuao
U-VI材料中高原子序数和高氧化态的组合产生高X射线衰减效率和源自配体到金属电荷转移的强烈绿色发光。这两个特点表明，U-VI材料可能作为上级X射线吸收剂，但这一假设仍然基本上未经检验。现在报道了在铀酰有机框架（SCU-9）中首次观察到肉眼可观察到的强烈X射线闪烁。结合在X射线激发过程中最小化铀的无机盐的非辐射弛豫的优点，SCU-9表现出非常有效的X射线到绿色光的发光转换。的发光强度与接收到的X-射线强度基本上呈线性相关，并与市售的CsI：Tl。与CsI：Tl相比，SCU-9具有改善的X射线衰减效率（E > 20 keV）以及增强的耐辐射性和降低的吸湿性。
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.