In situ growth strategy to construct perovskite quantum dot@covalent organic framework composites with enhanced water stability. (11th June 2023)

• Record Type: Journal Article
• Authors: Zhang, Hongyan; He, Xiaoxiong; Wang, Hao; Chen, Liangjun; Xu, Gaopeng; Zhang, Nan; Qu, Kang; He, Qingquan; Peng, Yongwu; Pan, Jun
• Is Part Of: Nanotechnology. Volume 34:Number 24(2023)
• Publication Date: 2023-06-11
• Subjects: in situ growth -- perovskite quantum dots -- covalent organic framework -- composite -- stability; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/acc1ec
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Metal halide perovskite quantum dots (QDs) have excellent optoelectronic properties; however, their poor stability under water or thermal conditions remains an obstacle to commercialization. Here, we used a carboxyl functional group (−COOH) to enhance the ability of a covalent organic framework (COF) to adsorb lead ions and grow CH3 NH3 PbBr3 (MAPbBr3 ) QDs in situ into a mesoporous carboxyl-functionalized COF to construct MAPbBr3 QDs@COF core–shell-like composites to improve the stability of perovskites. Owing to the protection of the COF, the as-prepared composites exhibited enhanced water stability, and the characteristic fluorescence was maintained for more than 15 d. These MAPbBr3 QDs@COF composites can be used to fabricate white light-emitting diodes with a color comparable to natural white emission. This work demonstrates the importance of functional groups for the in situ growth of perovskite QDs, and coating with a porous structure is an effective way to improve the stability of metal halide perovskites.