Yuanyuan Zhao, Jiancheng Chen, Jiancheng Chen, Li Zhang, Jiabin Chen, Jiabin Chen, Qing Liao, Zhong‐Qiu Li, Mei‐Jin Lin, Jiannian Yao, Yu‐Wu Zhong
, enabling high-resolution imaging. In contrast, the 1D material consists of corner-sharing inorganic chains. It shows green emission from organic free excitons and poor scintillation performance. This study establishes that pyridinium cation engineering is a potent and promising strategy for the design and optimization of metal halide-based emitters and scintillators.