Monodisperse and brightly luminescent CsPbBr3/Cs4PbBr6 perovskite composite nanocrystals. Issue 21 (22nd May 2018)

• Record Type: Journal Article
• Authors: Xuan, Tongtong; Lou, Sunqi; Huang, Junjian; Cao, Luyu; Yang, Xianfeng; Li, Huili; Wang, Jing
• Is Part Of: Nanoscale. Volume 10:Issue 21(2018)
• Page Start: 9840
• Page End: 9844
• Publication Date: 2018-05-22
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr01266k
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : We present a novel process of synthesizing nanoscale monodisperse CsPbBr3 /Cs4 PbBr6 composite NCs with bright emission in the solid state. Abstract : The microscale composite structure strategy of embedding CsPbBr3 nanocrystals (NCs) in the microscale Cs4 PbBr6 matrix (CPB113 /CPB416 ) has successfully demonstrated its ability to resolve the fluorescence quenching of perovskite NCs in the solid agglomeration state due to the loss of quantum confinement. Unfortunately, the controllable synthesis of monodisperse nanoscale composites with bright emission in the solid state remains a great challenge. Here, we present for the first time a novel supersaturated recrystallization process to controllably synthesize monodisperse CPB113 /CPB416 composite NCs with bright emission in the solid form, where CsPbBr3 NCs were uniformly embedded in the nano hexagonal Cs4 PbBr6 matrix. The existence of 2-methylimidazole (MeIm) not only can control the composition rate of CsPbBr3 to Cs4 PbBr6, the size and dispersity of CsPbBr3 in the composite NCs but can also help controllably obtain the monodisperse and hexagonal Cs4 PbBr6 matrix. The as-prepared composite structure can effectively prevent CsPbBr3 fluorescence quenching and make the composite NCs have a high photoluminescence quantum yield (PLQY) of 83%. In addition, we obtained tunable blue to red emitting composite NCs by varying the halide salts.