Oleic Acid‐Assisted Nucleation Growth of Highly Luminescent CsCu 2 I 3 Single Crystals and Their Films for Flexible and Dynamic High‐Resolution X‐Ray Imaging

作者：Tao Chen, Xin Li, Lin Feng, Haodi Wu, Dedan Mu, Ziwei Sun, Chen Chen, Ruliang Liu, Jie Yang, Rongfei Wang, Zhenhuan Zhao, Bin Meng, Xiaoming Wen, Jiming Bao, Jiang Tang, Xuhui Xu, Chong Wang · 发表于：Advanced Optical Materials · 年份：2023 · DOI：10.1002/adom.202301072 · 被引用次数：13 · 研究领域：Perovskite Materials and Applications、Ga2O3 and related materials、Electronic and Structural Properties of Oxides

Abstract Metal‐halide perovskites have emerged as one of the most promising contenders for the next‐generation X‐ray scintillators on account of their large absorption coefficients, high light yields, and low‐cost fabrication. However, the existing X‐ray scintillators are plagued either by poor stability or high toxicity. Here, highly stable and flexible CsCu 2 I 3 @polymethyl methacrylate (PMMA) composite films are fabricated simply by a facile one‐step drop‐coating technique. Benefiting from the reasonable light yields (24 100 photons MeV −1 ), short photoluminescence decay time (207 ns), and flat surface, a low detection limit of 39 nGy air s −1 and a record‐high resolution of up to 25 lp mm −1 are demonstrated in these CsCu 2 I 3 @PMMA composite films. The X‐ray imaging tests show that the CsCu 2 I 3 @PMMA composite films display excellent properties in the dynamic and irregular objects imaging. In addition, the CsCu 2 I 3 @PMMA composite films exhibit a desirable endurance to the high‐energy X‐ray's irradiation and the water erosion (photoluminescence quantum yield remains up of 90% of its initial value even after submersion in water for 300 h). This work provides a potential to develop eco‐friendly and highly stable halide perovskite materials for high‐resolution X‐ray imaging.