Coupled Halide-Deficient and Halide-Rich Reaction System for Doping in Perovskite Armed Nanostructures
Sumit Kumar Dutta a, Narayan Pradhan a
a School of Materials Sciences, Indian Association for the Cultivation of Science, IN, Kolkata-700032, Calcuta, India
Poster, Sumit Kumar Dutta, 016
Publication date: 6th May 2020

Physical insights of Mn(II) doping in CsPbCl3-armed hexapod nanostructures is presented. These complex structures were typically formed in halide concentration tuned modulated reactions. Cores were first formed under halide deficient condition and with\enriching halides; these were transformed to armed structures. Doping of Mn(II) was observed facilitated during the arm growth in the second stage of the reaction. These observations were supported with decoupled reactions with minimized and maximized halide concentrations carried out in separate reactions. In the decoupled process, while the halide-rich system led to exclusive platelets and showed the brightest emission in dopant ions, the halide-deficient reaction gave nanocubes with poor dopant concentration and less intense emission. However, these newly designed hexapods where halide concentration was in situ tuned in a single reaction remained at the intermediate. Moreover, less interference for the exciton to dopant energy transfer was noticed for the defect states created in halide deficient medium, and the intensity of the dopant emission remained proportional to the amount of dopant inserted in the nanocrystals. These finding not only supported the facts that free halides promote Mn(II) incorporation but also provided strong evidence for the same in a single reaction, which led to the formation of a new type of doped nanostructures.

TRC at IACS and internal faculty grants are acknowledged for funding. Sumit Kumar Dutta acknowledges CSIR for SPM fellowship. IACS capital grant is acknowledged for obtaining the TEM used for imaging. Prof. Narayan Pradhan is acknowledged for his constant support and supervision through out the project. All lab mates are also acknowledged for their constant support.

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