A comprehensive review for Blue Photoemission Perovskites: Controlling of Structure, Electronics, and Light Emitting Diodes

Abstract

In recent years, metal halide perovskites represent a flourishing scene of research, owing to the direct and tunable bandgaps, narrow bandwidth, and high carrier mobility, which are mainly driven by their potential application in optoelectronics field. The crystalline structure, electronic structures and luminescence properties of metal halide perovskites can be controlled by doping and ligand-modified, which would result in the enhancement of device performances. This review aims to provide an up-to-date survey of this fast-moving field and summarize the research and application for fabricating halide perovskite-based light-emitting diodes (PeLEDs). At present, the quantum efficiencies of PeLEDs are well over 20% for the red, green, and near-infrared bands and beyond. However, the optical properties of blue PeLEDs lag far behind their counterparts due to crystal structure. In this review, we first systematically explore the structure and unique physical properties of blue emissive perovskite materials and then further discuss the current core challenges in the field by reviewing the innovative strategies and research breakthroughs. Finally, we conclude that ligand passivation is a promising option for improving the device efficiency and stability and give a potential outlook in the field of blue emission PeLEDs.