Paul Sharmistha, Bladt Eva, Richter Alexander F, Döblinger Markus, Tong Yu, Huang He, Dey Amrita, Bals Sara, Debnath Tushar, Polavarapu Lakshminarayana, Feldmann Jochen
Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstrasse 10, 80539, Munich, Germany.
EMAT, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.
Angew Chem Int Ed Engl. 2020 Apr 20;59(17):6794-6799. doi: 10.1002/anie.201914473. Epub 2020 Mar 5.
The concept of doping Mn ions into II-VI semiconductor nanocrystals (NCs) was recently extended to perovskite NCs. To date, most studies on Mn doped NCs focus on enhancing the emission related to the Mn dopant via an energy transfer mechanism. Herein, we found that the doping of Mn ions into CsPbCl NCs not only results in a Mn -related orange emission, but also strongly influences the excitonic properties of the host NCs. We observe for the first time that Mn 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 Mn ions improves the size distribution of the NCs, which results in a prominent excitonic peak. However, with increasing the Mn 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.
将锰离子掺杂到II - VI族半导体纳米晶体（NCs）中的概念最近被扩展到钙钛矿NCs。迄今为止，大多数关于锰掺杂NCs的研究都集中在通过能量转移机制增强与锰掺杂剂相关的发射。在此，我们发现将锰离子掺杂到CsPbCl NCs中不仅会导致与锰相关的橙色发射，还会强烈影响主体NCs的激子性质。我们首次观察到锰掺杂会导致Ruddlesden - Popper（R.P.）缺陷的形成，从而在主体NCs内诱导量子限制。我们发现，少量锰离子掺杂改善了NCs的尺寸分布，这导致了一个突出的激子峰。然而，随着锰浓度的增加，R.P.平面的数量增加，导致单晶域变小。由此增强的限制和晶体不均匀性分别导致激子跃迁逐渐蓝移和展宽。
