Sensitive and Fast X‐Ray Scintillation with Perovskite‐Inspired Cerium Halide Nanocrystals
Huifang Yang, Chaohui Zhao, Yanze Wang, Xinqi Xu, Gaoyu Chen, Denglin Zhao, Zengguang Zhang, Min Rao, Juntao Lu, Yatao Zou, Zhongbin Wu, Wenbo Hu, Ziwei Li, Meng Su, Qiushui Chen, Xiaowang Liu, Nicolas H. Voelcker, Bo Peng, Weidong Xu
Abstract
Abstract Real‐time, high‐precision X‐ray imaging is of critical importance in a wide range of applications, from medical diagnostics to security screening. While lanthanide luminescent materials are among the most commonly used scintillators, achieving a combination of large‐area scalability, rapid response, and optimal performance remains challenging. Herein, a perovskite‐inspired cerium halide nanocrystal scintillator is presented with a remarkable photoluminescence quantum yield approaching unity and a fast radiative recombination rate of ≈29 ns. By leveraging these promising characteristics, large‐area X‐ray imaging is demonstrated with a spatial resolution of 12.21 lp mm −1 and an ultra‐low detection limit of 11.2 nGy s −1 , alongside applications in dynamic imaging. Based on these paternal nanocrystals, the versatile spectral tunability through halide alloying and cation doping is further explored, offering a promising platform for future chemical and structural design toward advanced scintillations and other down‐conversion applications.