Recent Advances on Cyan‐Emitting (480 ≤ λ ≤ 520 nm) Metal Halide Perovskite Materials

Over the past several years, perovskite‐based luminescent materials and devices have attracted considerable research interest and achieved superior performance, including red/near‐infrared, green, and blue regions. Despite the abundant research progress in the above‐mentioned luminous regions, studies on cyan‐emitting perovskites are still lacking. However, cyan‐emitting perovskite materials are of great importance and have many promising applications, especially for high‐quality lighting and light communication. Herein, the recent research progress on perovskite with cyan emission is summarized, including the preparation methods and improvement on device performance. The preparation strategies are categorized into compositional engineering, dimensional engineering, and size engineering. The corresponding device performance is displayed too. Furthermore, the strategies of performance enhancement and future perspectives are proposed in the end. There is hope that this minireview can trigger more attention to this particular emitting region. Cyan‐emitting perovskite materials show great potentials in various applications. Preparation approaches for stable cyan emission are summarized as compositional engineering, dimensional engineering, and size engineering. The corresponding light‐emitting diodes (LEDs) device performance and strategies for improvement are presented.