Proceedings of Online Meetup: Shape-Controlled Nanocrystals: Synthesis, Characterization Methods and Applications (ShapeNC)
Publication date: 6th May 2020
In the past decade, colloidal lead halide perovskite nanocrystals have emerged as highly promising semiconductor nanomaterials for future optoelectronics. Among nanocrystals of various shapes, two-dimensional colloidal perovskite nanoplatelets are viewed as one of the leading candidates because of the strong quantum- and dielectric-confinement and bright emission with high color purity. Here we demonstrate that ligand-assisted reprecipitation technique, which is a widely used room-temperature synthetic protocol for the synthesis of colloidal perovskites, can be extended to the facile synthesis of colloidal manganese-doped organic-inorganic hybrid perovskite nanoplatelets without the need of any post-treatment. Then it is shown that the incorporation of manganese as a dopant in those perovskite nanoplatelets induce significant enhancement of overall photoluminescence quantum yield, as well as excitation intensity-dependent dual color emission. Lastly, we propose a kinetic model that captures the essential dual color emission dynamics. We believe that those manganese-doped perovskite nanoplateletes are highly-confined tunable intrinsic dual emitters that can effectively expand perovskite nanocrystal functionality.
This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences (BES) under award number DE-SC0019345. This work also made use of the MRSEC Shared Experimental Facilities at MIT, supported by the National Science Foundation under award number DMR-08-19762.
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