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Green Synthesis of Halide Perovskite Nanocrystals (CsPbBr3 and CH3NH3PbBr3)

Fuqian Yang

Department of Chemical and Materials Engineering

University of Kentucky, USA

Perovskite nanocrystals are regarded as next-generation functional materials for optoelectronic applications. To date, most synthesis methods have involved the use of organic solvents, such as N, N-dimethylformamide and dimethyl sulfoxide, which poses a potential threat to the environment, health and security. In this talk, I report our recent work on the feasibility to produce microsized APbBr3 (A: Cs+ or CH3NH3+) crystals with deionized water as the precursor solvent via an environmental-friendly and cost-efficient approach and APbBr3 nanocrystals from the microsized APbBr3 crystals through a followed ultrasonication process. The blue-emitting CsPbBr3 nanocrystals exhibit a photoluminescence (PL) quantum yield of 80%, much larger than 61.4% of the CsPbBr3 nanocrystals made by an anti-solvent method; the green-emitting CsPbBr3 nanocrystals exhibit better stability than those made by the antisolvent method over 9 days. The CH3NH3PbBr3 nanocrystals derived from the CH3NH3PbBr3 powder exhibit a high photoluminescence quantum yield (PLQY) of 93.86%. Poly(methyl methacrylate) (PMMA)- CH3NH3PbBr3PbBr3 NC films made from the CH3NH3PbBr3PbBr3 PeNCs retain ~97% and ~91% of initial PL intensity after 720 h aging in ambient environment at 50 °C and 70 °C, respectively.


Dr. Fuqian Yang is a professor in the Department of Chemical and Materials Engineering at the University of Kentucky. Dr. Yang hasestablished a vigorous research program in the University of Kentucky in green synthesis of semiconductor nanocrystals, synthesis of ultrafine metallic materials, diffusion-induced stress, multiscale micromechanical testing and characterization, including nanoindentation, atomic force microscopy, microindentation, and dynamic mechanical behavior. He has proposed the concept of grain boundary fluid in analyzing the creep behavior of crystalline metals, developed the techniques of electrical impression test, electric indentation, and evaporation-induced surface structures on polymer films, and developed green routes for the synthesis of semiconductor nanocrystals. He has published more than 420 archival refereed journal papers. Dr. Yang is an associated editor for Journal of Manufacture Processes and a member of editorial board for Materials Science and Engineering A. He and Professor J.C.M. Li of the University of Rochester co-edited a book “Micro and Nano Mechanical Testing of Materials and Devices”, which was published by Springer in 2008.