Exploring stimuli‐responsive luminescence in metal halide perovskites for emerging applications

Abstract Metal halide perovskites are recognized for their solution processability and high luminescent efficiency. Their broad optoelectronic applications are however challenged by their high sensitivity to the environment, a consequence of their ionic nature and low formation energy. Nevertheless, this sensitivity allows for a range of luminescent responses to different stimuli, positioning them as a novel class of responsive materials. This review aims to elucidate the flexible and diverse luminescence responses in metal halide perovskites while highlighting their significance for future information‐related applications. It begins by introducing the working principles of responsive luminescent metal halide perovskites, followed by discussions on their changes in luminescence color, intensity, and lifetime in response to various stimuli, along with further elaboration on their emerging applications in sensing, anti‐counterfeiting, and information encryption. It concludes by summarizing the challenges and providing perspectives on the future development of this exciting field.