Synthesis of ultrasmall CsPbBr3 nanoclusters and their transformation to highly deep-blue-emitting nanoribbons at room temperature. Issue 44 (8th November 2017)

• Record Type: Journal Article
• Authors: Xu, Yibing; Zhang, Qiang; Lv, Longfei; Han, Wenqian; Wu, Guanhong; Yang, Dong; Dong, Angang
• Is Part Of: Nanoscale. Volume 9:Issue 44(2017)
• Page Start: 17248
• Page End: 17253
• Publication Date: 2017-11-08
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c7nr06959f
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Ultrasmall CsPbBr3 nanoclusters can be converted to highly deep-blue-emitting CsPbBr3 nanoribbons at room temperature. Abstract : Discretely sized semiconductor clusters have attracted considerable attention due to their intriguing optical properties and self-assembly behaviors. While lead halide perovskite nanostructures have been recently intensively explored, few studies have addressed perovskite clusters and their self-assembled superstructures. Here, we report the room-temperature synthesis of sub-2 nm CsPbBr3 clusters and present strong evidence that these ultrasmall perovskite species, obtained under a wide range of reaction conditions, possess a specific size, with optical properties and self-assembly characteristics resembling those of well-known II–VI semiconductor magic-sized clusters. Unlike conventional CsPbBr3 nanocrystals, the as-synthesized CsPbBr3 nanoclusters spontaneously self-assemble into a hexagonally packed columnar mesophase in solution, which can be further converted to single-crystalline CsPbBr3 quantum nanoribbons with bright deep-blue emission at room temperature. Such a conversion of CsPbBr3 nanoclusters to nanoribbons is found to be driven by a ligand-destabilization-induced crystallization and mesophase transition process. Our study will facilitate the investigation of perovskite nanoclusters and offer new possibilities in the low-temperature synthesis of anisotropic perovskite nanostructures.