Fast Room-Temperature Cation Exchange Synthesis of Mn-Doped CsPbCl3 Nanocrystals Driven by Dynamic Halogen Exchange

• Published in: ACS applied materials & interfaces 2018-11, Vol.10 (46), p.39872-39878
• Main Authors: Chen, Daqin, Zhou, Su, Fang, Gaoliang, Chen, Xiao, Zhong, Jiasong
• Format: Article
• Language: English
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.8b13316

Currently, it is of great challenge to achieve cation exchange in CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) on account of rigid Pb2+ octahedral coordination protected by six halogen anions (PbX6 4–). Herein, we demonstrate that dynamic halogen exchange can effectively open up PbX6 4– octahedrons and enable fast Mn-to-Pb cation exchange at room temperature in a few seconds. Importantly, Cl concentration rather than Mn one is demonstrated to be a dominant factor for cation exchange, where different Mn2+/Cl– salts can be adopted as Mn/Cl sources and Cl-to-Cl or Cl-to-Br anion exchange is the necessary prerequisite. Such a facile synthesizing method can lead to the feasibility of tuning emissive colors for the Mn-doped CsPb­(Cl/Br)3 NCs by controlling both cation and anion exchanges and open a new way to replace Pb2+ in CsPbX3 NCs by other nontoxic metal elements.