文献类型：期刊文献

英文题名：Highly Stable Mixed Halide Perovskite Nanocrystals for High Performance Pure-Red Light-Emitting Diodes

作者：Ye, Siyuan[1];Lin, Fei[1];Peng, Linwei[1];Li, Jiaxin[1];Ruan, Qiaohui[1];Lin, Zhuohan[1];Xu, Wang[1];Li, Yan[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Peoples R China

年份：2025

卷号：13

期号：5

外文期刊名：ADVANCED OPTICAL MATERIALS

收录：;EI(收录号：20244517328333);WOS:【SCI-EXPANDED(收录号:WOS:001354280500001)】；

基金：This research was sponsored by Natural Science Foundation of Shanghai (grant no 23ZR1415900) and the Fundamental Research Funds for the Central Universities (no 222201717003). The authors thank Research Center of Analysis and Test of East China University of Science and Technology for the help on the characterization.

语种：英文

外文关键词：heterogeneous synthesis; light-emitting diodes; nanocrystals; perovskite; phase separation

摘要：Pure-red CsPbBrxI3-x nanocrystals (NCs) light-emitting diodes (PeLEDs) are promising candidates for high-performance display due to their high brightness, excellent color purity and readily tunable band gap. However, achieving highly stable pure-red PeLEDs is still challenging due to phase segregation in the mixed halide CsPbBrxI3-x NCs. Herein, pure-red mixed halide CsPbBrxI3-x NCs with a relatively small size are synthesized using phosphate acid as a ligand, effectively avoiding spontaneous phase separation. The strong interaction between phosphate ligands and Pb2+ facilitates the slow formation of CsPbBrxI3-x NCs, resulting in relatively small NC sizes. In addition, a dense phosphate passivation layer forms around the surface of NCs, which imparts excellent stability to the NCs against light, moisture and heat treatment. Utilizing the highly stable CsPbBrxI3-x NCs as an emission layer, pure-red PeLEDs emitting at 633 nm, with an external quantum efficiency (EQE) of 10.0%, a brightness of 8231 cd m-2 and a half-life of 393 min, are fabricated. Notably, the PeLEDs show excellent stability, with negligible changes in the emission spectra under an elevated bias voltage of 14 V. This work provides a new avenue for enhancing the performance of pure red PeLEDs through strongly coordinated phosphate ligand passivation.