题目：Efficient and Stable Blue Perovskite Light-Emitting Diodes Enabled by Effective Hydrolysis of Dichloride

作者：Xin Zhou¹, Zhenwei Ren^1*, Zhiyong Zheng¹, Chengzhao Luo¹, Hua Chen¹, Huanxi Peng¹, Bin Hu¹, Yu Chen^1,2*

单位：

¹School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China

²National University of Singapore Suzhou Research Institute, Dushu Lake Science and Education Innovation District, Suzhou 215123, P. R. China

摘要：Despite the substantial progress in sky-blue (480−495 nm) perovskite light-emitting diodes (PeLEDs), the pure-blue PeLEDs (<480 nm) merely show moderate performances. As a straightforward and effective facile way to obtain pure-blue emission, the bromide-chloride mixed perovskites have received considerable attention. However, the tricky issue of halide migration in the mixed halide perovskites makes a tough challenge to achieve efficient PeLEDs with stable electroluminescence (EL) spectra. Herein, the in situ treatment of Cl-rich benzene phosphorus oxydichloride (BPOD) is proposed to achieve high-quality pure-blue perovskites by simultaneously enlarging the perovskite bandgap, passivating the halide vacancy defects, and immobilizing the halide ions through the hydrolysis products of chloride ions and phenylphosphonic acid. As a result, highly-performed pure-blue PeLEDs with a maximum external quantum efficiency (EQE) of 9.3% at 477 nm, an impressive lifetime of 34.7 min at 104 cd m⁻², and very stable EL spectra are achieved, which are superior to the conventional mixed halide PeLEDs based on lead-chloride precursor, representing one of the best performances for mixed halide pure-blue PeLEDs. Therefore, this work contributes a feasible and effective method for efficient and stable pure-blue PeLEDs.

影响因子：18.5

分区情况：一区

链接:https://doi.org/10.1002/adfm.202412894