Tin-Halide Perovskites for Near-Infrared Light-Emitting Diodes

Light-emitting diodes (LEDs) with different emission spectra are widely used in daily life for a variety of applications. However, due to fundamental restrictions of light-emitting materials, the development of near-infrared LEDs (NIR-LEDs) is still modest. Recently, solution-processed tin-halide perovskites (THPs) have emerged as one of the most promising light-emitting materials for NIR-LED applications. In this Perspective, we start with discussing the peculiarities of THP semiconductors and how their electronic properties affect the light emission efficiency. We then summarize the current efforts in material engineering to design and master the electronic properties of THP films. Finally we give an outlook on the future challenges and technical roadmap for tin-based perovskite LEDs.