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First Synthesis of Mn-Doped Cesium Lead Bromide Perovskite Magic Sized Clusters at Room Temperature
- Xu, Ke;
- Vickers, Evan T;
- Luo, Binbin;
- Allen, A’Lester C;
- Chen, Eefei;
- Roseman, Graham;
- Wang, Qihui;
- Kliger, David S;
- Millhauser, Glenn L;
- Yang, Wenjing;
- Li, Xueming;
- Zhang, Jin Zhong
Published Web Location
https://doi.org/10.1021/acs.jpclett.9b03700Abstract
Mn-doped CsPbBr3 perovskite magic sized clusters (PMSCs) are synthesized for the first time using benzoic acid and benzylamine as passivating ligands and MnCl2·4H2O and MnBr2 as the Mn2+ dopant sources at room temperature. The same approach is used to prepare Mn-doped CsPbBr3 perovskite quantum dots (PQDs). The concentration of MnX2 (X = Cl or Br) affects the excitonic absorption of the PMSCs and PQDs. A higher concentration of MnX2 favors PMSCs over PQDs as well as higher photoluminescence (PL) quantum yields (QYs) and PL stability. The large ratio between the characteristic Mn emission (∼590 nm) and the host band-edge emission shows efficient energy transfer from the host exciton to the Mn2+ dopant. PL excitation, electron paramagnetic resonance, and time-resolved PL results all support Mn2+ doping in CsPbBr3, which likely replaces Pb2+ ions. This study establishes a new method for synthesizing Mn-doped PMSCs with good PL stability, high PLQY and highly effective passivation.
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