Toward eco-friendly and stable halide perovskite-inspired materials for light-emitting devices applications by dimension classification: Recent advances and opportunities

Abstract

Research on lead-halide perovskites for photovoltaic and optoelectronic applications represents a rapidly developing field of optoelectronics on account of their remarkable optoelectronic properties, including large absorption coefficient, low-temperature solution processability, tunable bandgap, high-carrier mobility, and so on. Unfortunately, the toxicity of metal Pb and intrinsic instability of lead-halide perovskites are still big obstacles for their practical applications and future commercial development. Therefore, various lead-free eco-friendly perovskites and their derivatives have been alternatively explored to overcome the above hurdles. In this review, the preparation methods, structures, optical characteristics, and stability of lead-free metal halide perovskites are summarized according to different dimensions at molecular level. Furthermore, we emphatically introduce the optoelectronic properties of low-dimensional lead-free halides with broadband emission originated from the self-trapped excitons. Then, we give a brief description of preliminary exploration results and significant achievements of optically excited white light-emitting devices (WLEDs) and electrically excited multi-color LEDs. Finally, this review was finished with a critical perspective into the potential challenging issues of this rapidly evolving fields. (Figure presented.).