Photoluminescence Properties of Mn Doped CsPbCl3 Perovskite Quantum Dots

被引：0
|
作者：
Chen X.-H. [1 ]
Ji S.-H. [2 ]
Yuan X. [2 ]
Zhao J.-L. [2 ]
机构：
[1] School of Science, Northeast University, Shenyang
[2] Key Laboratory of Functional Materials Physics and Chemistry of The Ministry of Education, Jilin Normal University, Siping
来源：
Chen, Xiao-Hui (hxc_006@163.com) | 2018年 / Editorial Office of Chinese Optics卷 / 39期
基金：
中国国家自然科学基金;
关键词：
Doped quantum dots; Perovskite; Photoluminescence; Quantum yield;
D O I：
10.3788/fgxb20183905.0609
中图分类号：
学科分类号：
摘要：
Photoluminescence(PL) properties of Mn doped CsPbCl3 (Mn:CsPbCl3) perovskite quantum dots(QDs) with various Mn/Pb molar ratios were studied. Two emission bands peaked at around 400 nm and 600 nm, respectively, were observed in Mn:CsPbCl3 QDs at room temperature. The PL intensity of Mn ion emission in the Mn:CsPbCl3 QDs was significantly enhanced with respect to the band edge exciton emission as Mn/Pb molar ratio increased from 0.5:1 to 5:1. Both the exciton absorption and emission bands in the doped QDs shifted to the blue, which was consistent with the reduction of the QD size. The red shift of Mn2+ emission band with increasing the molar ratio was considered to result from the formation of Mn2+-Mn2+ pairs in the doped QDs due to high concentration Mn doping. Further, the PL quantum efficiency of Mn:CsPbCl3 QDs as a function of Mn/Pb molar ratio was studied in detail. It is found that the PL quantum yield of Mn2+ gradually increases with the increasing of Mn/Pb molar ratio. The maximum PL quantum yield reaches 62% as Mn/Pb molar ratio is 2:1. The PL quantum yield drops continually with the increasing of Mn/Pb molar ratio to 5:1. The reduction of PL quantum yield at high concentration Mn doping is related to Mn doping concentration-induced PL quenching due to the formation of Mn2+-Mn2+ pairs. The temperature-dependence of PL spectra in Mn:CsPbCl3 QDs demonstrates that Mn2+ emission band shifts to the blue and the emission width is broadened, while PL intensity increases, which is in contrast to Ⅱ-Ⅵ semiconductor QDs. © 2018, Science Press. All right reserved.
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页码：609 / 614
页数：5
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