Light-emitting diodes (LEDs) based on metal halide perovskite nanocrystals (MHP NCs) have been rapidly developed to reach external quantum efficiencies of up to 22% with their defect-tolerant nature and extremely high color purity (full width half maxima <25 nm) that are superior to traditional inorganic colloidal quantum dots. However, highly dynamic binding of ligands impedes further increase in efficiency and induces intrinsic instability. In this review, we discuss the light emission in MHP NCs, surface chemistry regarding the surface termination of MHP crystal, and the binding of ligands to crystals. We also discuss strategies to overcome the instability of ligands to improve efficiency and stability of MHP NCs and finally achieve high efficiency of their LED devices.

基于金属卤化物钙钛矿纳米晶体（MHP NCs）的发光二极管（LED）已被迅速开发，由于其具有耐缺陷性和极高的色纯度（全宽半最大值<25 nm），外部量子效率高达22％。 ）优于传统的无机胶体量子点。但是，配体的高动态结合阻碍了效率的进一步提高并引起内在的不稳定性。在这篇综述中，我们讨论了MHP NCs中的发光，有关MHP晶体表面终止的表面化学以及配体与晶体的结合。我们还讨论了克服配体不稳定性的策略，以提高MHP NC的效率和稳定性，并最终实现其LED器件的高效率。