The photoluminescence (PL) of doped ions is depended strongly on the position of the ion in the substrate. Ion doping endows semiconductor nanocrystals with novel properties. In this paper, Mn:CsPb(Cl/Br)3 nanocrystals (NCs) with different halogen ratios were obtained by one-pot hot injection synthesis and halogen ion exchange. The emission of Mn2+ from 4T1g-6A1g d-d transition was observed in the case of changing the molar ratio of Cl/Br for Mn:CsPb(Cl/Br)3 NCs. In the case of a Cl/Br ratio of 4/1, the PL peak of perovskite became weak and Mn2+ emission was enhanced. After I− ion exchange, the emission of Mn2+ was observed in Mn:CsPb(Cl/Br)3 with Cl/Br ratio of 1/4, in which the PL efficiency of the nanocrystals reached 55.74%. Thus, Cl− ions increase the band gap and effectively promote the emission of Mn2+. At the same time, the morphology of the samples after ion exchange always remains cube. The lifetimes of the nanocrystals were short aged with increasing Cl− ions and prolonged with increasing I− ions. Because these Mn:CsPbX3 (x = Cl, Br, I) NCs with different halogen ratios revealed highly stabile blue to red emission, the nanocrystals would be utilizable for further applications.
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This work was supported in part by the projects from the National Natural Science Foundation of China (no. 51772130, 51972145, and 51572109).
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Zhao, Y., Xie, C., Song, Y. et al. Emission of Mn2+ ions in Mn:CsPbX3 (x = Cl, Br, I) nanocrystals adjusted with halogen ion ratios. J Nanopart Res 22, 147 (2020). https://doi.org/10.1007/s11051-020-04884-w
- Mn:CsPbX3 quantum dots
- Double emission
- Ion exchange
- Mn ions