材料科学
兴奋剂
钙钛矿(结构)
激子
卤化物
钝化
纳米晶
离子
无机化学
带隙
纳米技术
结晶学
光电子学
化学
凝聚态物理
有机化学
物理
图层(电子)
作者
Rui Zhang,Yaoxin Yuan,Jianfeng Zhang,Haiyun Liu,Gang Chen,Kun Li,Mengqing Hong,Wenbin Zuo,Chunlan Wang,Wen Yang,Zhen Qin
标识
DOI:10.1007/s10853-021-05779-4
摘要
Mn-doped perovskite CsPb(Cl/Br)3 nanocrystals (NCs) have been widely explored due to their unique dual-color emission characteristics, which could reduce the usage of toxic Pb and introduce the exciton emission in blue region and the stable Mn2+ emission peak in orange-red region via energy transfer from exciton to Mn2+ emission. Although doping high concentration Mn2+ could increase the Mn2+ emission, excess Mn2+ ions would be expelled from the host perovskite lattice. Doping secondary metal Ni into the NCs as an efficient method is always used to improve the Mn2+ emission. We adopted a one-pot halogen injection into Cs-precursor under ambient environment method to prepare (Mn, Ni): CsPbCl3 and (Mn, Ni): CsPb(Cl/Br)3 NCs, which introduces NiCl2 in the Mn: CsPb(Cl/Br)3 NCs to supply enough halide ions and to passivate defect states or traps in the perovskite NCs so as to enhance Mn2+ emission. Density Functional Theory (DFT) calculations were also conducted to explain our experimental results, which revealed that Ni2+ doping could eliminate the in-gap deep defects of the CsPb(Cl/Br)3 nanocrystals. In addition, the passivated lattice defects help to improve the stability of the perovskite NCs, preventing from electron beam irradiation.
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