文章标题/Title：
影响因子/Impact Factor：9.0
文章链接/Link：https://onlinelibrary.wiley.com/doi/10.1002/adom.202303237
摘要/Abstract：Perovskite light-emitting diodes (PeLEDs) based on quasi-2D perovskites have attracted great attention in the past few years. Although significant achievements are made in device performance, fabrication of high-efficiency PeLEDs with pure-red (620–635 nm) light emission remains a significant challenge, which inhibits their practical application for full-color displays. Herein, a series of efficient red PeLEDs at 625 nm are realized by employing volatile alkylammonium chlorides (propylammonium chloride) passivators. The interaction of PbI2 with propylamine (PA)…H+Cl− in the precursor solution effectively passivates the defects, leading to reduced non-radiative recombination and enhanced device performance. By optimizing the amount of PACl, an external quantum efficiency (EQE) of 16.1% and a maximum brightness of 1701 cd m−2 are achieved, among the best-performing quasi-2D I-based PeLEDs with emissions ranging from 620 to 635 nm. This work provides a new route to improve the stability and efficiency of pure-red PeLEDs.
