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https://doi.org/10.1007/s12274-021-3808-y

X-Ray imager of 26-μm resolution achieved by perovskite assembly

Zhaofen Wang1,§, Ruijia Sun2,§, Nianqiao Liu3,§, Huailin Fan4, Xun Hu4, Depeng Shen2 (✉), Yuhai Zhang2 (✉), and Hong Liu1,2 (✉)

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1 State Key Laboratory of Crystal Material, Shandong University, Jinan 250100, China
2 Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong, Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan 250022, China
3 School of Physics and Technology, University of Jinan, Jinan 250022, China
4 School of Material Science and Engineering, University of Jinan, Jinan 250022, China
§ Zhaofen Wang, Ruijia Sun, and Nianqiao Liu contributed equally to this work.

Keywords: perovskite scintillator, high-resolution X-ray imaging, self-assembly, perovskite nanosheets, all-inorganic perovskite
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  • Abstract
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Spatial resolution is an important criterion to evaluate the performance of a scintillation screen for X-ray imaging. Perovskitebased X-ray screen, usually made of powders or polycrystalline films, suffers from low spatial resolution (~ 200 μm) due to the large thickness of scintillation layer despite of their compelling sensitivity to X-ray dose. In this work, a concentrated colloid of CsPbBr3 nanosheets was synthesized via a co-precipitation method at ambient condition. By drop casting, smooth scintillation screens of varied thickness were formed through self-assembly, which exhibited both high internal and external photoluminescence quantum yield (PL QY) (84.5% and 75.1%, respectively). The screen-based X-ray detector showed a high sensitivity down to 27 nGy/s, two orders of magnitude lower than the regular dose for medical diagnostics. Importantly, the screen of optimal thickness of 15 μm showcased an unprecedented spatial resolution (26 μm) when used for X-ray radiography, representing one order of magnitude improvement in perovskite community.
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X-Ray imager of 26-μm resolution achieved by perovskite assembly. Nano Res. https://doi.org/10.1007/s12274-021-3808-y

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