孙洪涛教授在 ACS Appl. Mater. Interfaces 上发表研究论文

Cs4PbBr6/CsPbBr3Perovskite Composites with Near-Unity Luminescence Quantum Yield: Large-Scale Synthesis, Luminescence and Formation Mechanism, and White Light-Emitting Diode Application

Ya-Meng Chen,Yang Zhou,Qing Zhao,Jun-Ying Zhang§,Ju-Ping Ma,Tong-Tong Xuan,Shao-Qiang Guo§,Zi-Jun Yong,Jing Wang,Yoshihiro Kuroiwa,Chikako Moriyoshi, and Hong-Tao Sun*(孙洪涛)

  

College of Chemistry, Chemical Engineering and Materials Science,Soochow University,Suzhou215123,P. R. China

Department of Physical Science,Hiroshima University, Higashihiroshima,Hiroshima739-8526,Japan

§Department of Physics,Beihang University,Beijing100191,P. R. China

State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry,Sun Yat-sen University,Guangzhou510275,P. R. China

Ya-Meng Chen,Yang Zhou,Qing Zhao andJun-Ying Zhangcontributed equally to this work

  

ACS Appl. Mater. Interfaces,2018,10(18), 15905--15912

  

All-inorganic perovskites have emerged as a new class of phosphor materials owing to their outstanding optical properties. Zero-dimensional inorganic perovskites, in particular the Cs4PbBr6-related systems, are inspiring intensive research owing to the high photoluminescence quantum yield (PLQY) and good stability. However, synthesizing such perovskites with high PLQYs through an environment-friendly, cost-effective, scalable, and high-yield approach remains challenging, and their luminescence mechanisms has been elusive. Here, we report a simple, scalable, room-temperature self-assembly strategy for the synthesis of Cs4PbBr6/CsPbBr3perovskite composites with near-unity PLQY (95%), high product yield (71%), and good stability using low-cost, low-toxicity chemicals as precursors. A broad range of experimental and theoretical characterizations suggest that the high-efficiency PL originates from CsPbBr3nanocrystals well passivated by the zero-dimensional Cs4PbBr6matrix that forms based on a dissolution–crystallization process. These findings underscore the importance in accurately identifying the phase purity of zero-dimensional perovskites by synchrotron X-ray technique to gain deep insights into the structure–property relationship. Additionally, we demonstrate that green-emitting Cs4PbBr6/CsPbBr3, combined with red-emitting K2SiF6:Mn4+, can be used for the construction of WLEDs. Our work may pave the way for the use of such composite perovskites as highly luminescent emitters in various applications such as lighting, displays, and other optoelectronic and photonic devices.

  

  

链接:https://pubs.acs.org/doi/10.1021/acsami.8b04556