Articles written in Journal of Chemical Sciences

    • Temperature-dependent anomalous Mn2+ emission and excited state dynamics in Mn2+-doped MAPbCl3-xBrx nanocrystals


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      In hybrid perovskites, MAPbI3 and MAPbBr3 have been extensively studied for their optical andphotovoltaic properties, but MAPbCl3 is significantly less investigated for its optical and photovoltaicproperties due to its low photoluminescence quantum yield (PL QY) and a large band gap. However, the largeband gap makes it a suitable host for doping transition metal ions to explore new optical properties. Wesynthesized nanocrystals (NCs) of MAPbCl3 doped with Mn2+ by simple ligand assisted reprecipitationmethod. The reaction temperature and Pb to Mn feed ratio were optimized by preparing a series of Mn2+-doped MAPbCl3 NCs. The prepared NCs show bright Mn2+ emission with ~13% PL QY suggesting anefficient energy transfer from host NCs to Mn2+. Since the large bandgap of MAPbCl3 precludes thepossibility of investigating temperature-dependent PL and lifetime measurements to understand the excitedstate dynamics, we carried out these experiments on Mn2+ doped MAPbCl2.7Br0.3 with the Br concentrationadjusted to bring the bandgap of the alloyed system within the limits of the experimental technique. Ourstudies establish an anomalous behavior of Mn2+ PL emission in this host. These results reveal the origin of atemperature mediated energy transfer from exciton to Mn2+ and provide an understanding of the underlyingmechanisms of PL properties of this new class of NCs.

      SYNOPSIS: Nanocrystals (NCs) of MAPbCl3-xBrx doped with Mn2+ were prepared by simple ligand assisted reprecipitation method. Reaction temperature and Mn2+ concentrations were optimized to achieve maximum Mn2+ emission. The temperature-dependent photoluminescence results reveal the origin of temperature mediated energy transfer from exciton to Mn2+ in MAPbCl3-xBrx NCs.

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