Recent Advances in All‐Inorganic Zero‐Dimensional Metal Halides

Abstract All‐inorganic zero‐dimensional (0D) metal halides are composed of isolated metal halide polyhedrons bridged by monovalent alkali metal ions. The unique structure gives rise to molecule‐like electronic configuration and consequently highly attractive optical properties. In comparison with their three‐dimensional (3D) counterparts, the 0D metal halides exhibit characteristic features such as broadband emission and long‐term stability. In addition, 0D metal halides can be constructed from a diverse range of metal ions and permit high‐level impurity doping, thereby offering great structural designability and spectral tunability. This Review surveys recent advances in 0D metal halides, including crystal preparation, luminescence modulation, and emerging applications.