Manganese‐Doping‐Induced Quantum Confinement within Host Perovskite Nanocrystals through Ruddlesden–Popper Defects |
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Authors: | Sharmistha Paul Eva Bladt Alexander F Richter Markus Dblinger Yu Tong He Huang Amrita Dey Sara Bals Tushar Debnath Lakshminarayana Polavarapu Jochen Feldmann |
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Institution: | Sharmistha Paul,Eva Bladt,Alexander F. Richter,Markus Döblinger,Yu Tong,He Huang,Amrita Dey,Sara Bals,Tushar Debnath,Lakshminarayana Polavarapu,Jochen Feldmann |
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Abstract: | The concept of doping Mn2+ ions into II–VI semiconductor nanocrystals (NCs) was recently extended to perovskite NCs. To date, most studies on Mn2+ doped NCs focus on enhancing the emission related to the Mn2+ dopant via an energy transfer mechanism. Herein, we found that the doping of Mn2+ ions into CsPbCl3 NCs not only results in a Mn2+‐related orange emission, but also strongly influences the excitonic properties of the host NCs. We observe for the first time that Mn2+ doping leads to the formation of Ruddlesden–Popper (R.P.) defects and thus induces quantum confinement within the host NCs. We find that a slight doping with Mn2+ ions improves the size distribution of the NCs, which results in a prominent excitonic peak. However, with increasing the Mn2+ concentration, the number of R.P. planes increases leading to smaller single‐crystal domains. The thus enhanced confinement and crystal inhomogeneity cause a gradual blue shift and broadening of the excitonic transition, respectively. |
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Keywords: | CsPbX3 nanocrystals exciton properties manganese-doped perovskite nanocrystals quantum confinement Ruddlesden– Popper defects |
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