Airflow-Controlled Crystallization for a Multi-Inch 2D Halide Perovskite Single-Crystal Scintillator for Fast High-Resolution X-ray Imaging
Binxia Jia, Depeng Chu, Nan Li, Yunxia Zhang, Zhou Yang, Yingjie Hu, Zeqin Zhao, Jiangshan Feng, Xiaodong Ren, Hao Zhang, Guangtao Zhao, Huaming Sun, Ningyi Yuan, Jianning Ding, Yucheng Liu, Shengzhong Liu
Abstract
Theoretical analyses indicate that a two-dimensional (2D) layered metal halide perovskite, with its unique quantum-well structure and large exciton binding energy, should render both fast and strong fluorescence, making it ideal for fast X-ray imaging. Herein, an airflow-controlled solvent evaporation system is designed to grow an inch-sized 2D (PEA)2PbBr4 single crystal (SC) at low temperature (30 °C). Under X-rays, the (PEA)2PbBr4 SC exhibits a high light yield of 73226 photons/MeV and a fast response time of 14 ns, which is approximately 1.4 times higher and 75 times faster than those of the commercial CsI:Tl scintillator (54000 photons/MeV and 1049 ns), respectively. With such significant merits, an X-ray imager is assembled by integrating a (PEA)2PbBr4 SC with dimensions of 57 × 41 mm2 for X-ray imaging, and a high spatial resolution of 11.1 lp/mm is achieved, which demonstrates the application prospect of the large-size (PEA)2PbBr4 SC in high-speed nondestructive medical diagnosis.