Chem. Sci., 2025, Accepted Manuscript DOI: 10.1039/D5SC04721H, Edge Article Mengzhu Wang, Xiaolong Li, Siwen Zou, Haixia Cui, Yongjing Deng, Jiangang Li, Yi Jiang, Longlu Wang, Shu-Juan Liu, Qiang Zhao, Yun Ma Developing efficient, narrow-band, and environmentally friendly emitters is crucial for advanced optoelectronics. Herein, we report a zero-dimensional (0D) organic-inorganic hybrid manganese(II) halide, (TPS)2MnBr4 (TPS = triphenylsulfonium), engineered via cation selection....