Nano-Micro Letters

Ultra-stable CsPbBr3 Nanosheets for X-ray Imaging Screen

Liangling Wang1, 2, Kaifang Fu1, Ruijia Sun1, Huqiang Lian3, Xun Hu3, Yuhai Zhang1,*

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Nano-Micro Lett. (2019) 11: 52

First Online: 24 June 2019 (Article)


*Corresponding author. E-mail: ifc_zhangyh@ujn.edu.cn (Yuhai Zhang)





Wet-chemistry methods, including hot injection and precipitation methods, have emerged as major synthetic routes for high-quality perovskite nanocrystals in backlit display and scintillation applications. However, low chemical yield hinders their upscale production for practical use. Meanwhile, the labile nature of halide-based perovskite poses a major challenge for long-term storage of perovskite nanocrystals. Herein, we report a green synthesis at room temperature for gram-scale production of CsPbBr3 nanosheets with minimum use of solvent, saving over 95% of the solvent for the unity-mass nanocrystal production. The perovskite colloid exhibits record stability upon long-term storage for up to 8 months, preserving a photoluminescence quantum yield (PL QY) of 63% in solid state. Importantly, the colloidal nanosheets show self-assembly behavior upon slow solidification, generating a crack-free thin film in a large area. The uniform film was then demonstrated as an efficient scintillation screen for X-ray imaging. Our findings bring a scalable tool for synthesis of high-quality perovskite nanocrystals, which may inspire the industrial optoelectronic application of large-area perovskite film.



CsPbBr3; Nanosheets; Ultra-stable; Gram-scale; X-ray imaging

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