Ligand induced anomalous emission shift of size-controlled CsPbBr3 nanocrystals

被引:19
作者
Kong, Xiaobo [1 ]
Xu, Fan [1 ]
Wang, Wenzhi [2 ]
Juan, Fangying [1 ]
Wu, Yangqing [1 ]
Li, Xiaoman [1 ]
Li, Jinkai [2 ]
Chen, Xin [1 ]
Cao, Bingqiang [1 ,2 ]
机构
[1] Qufu Normal Univ, Shandong Prov Key Lab Laser Polarizat & Informat, Sch Phys & Phys Engn, Qufu 273165, Shandong, Peoples R China
[2] Univ Jinan, Sch Mat Sci & Engn, Mat Res Ctr Energy & Photoelectrochem Convers, Jinan 250022, Shandong, Peoples R China
基金
中国国家自然科学基金;
关键词
HALIDE PEROVSKITE NANOCRYSTALS; LIGHT-EMITTING-DIODES; QUANTUM DOTS; MEDIATED SYNTHESIS; CSPBX3; BR; CL;
D O I
10.1063/1.5116258
中图分类号
O59 [应用物理学];
学科分类号
摘要
CsPbX3 perovskite nanocrystals (NCs) have attracted much attention from researchers because of their excellent photoelectric properties like high quantum yield, large absorption cross section, and simple preparation process. The addition of ligands in the synthesis process has a significant effect on the microstructure and photophysical properties of solution-processed NCs, which needs further extensive studies. In this Letter, the effects of ligand electronegativity on the size and photoluminescence (PL) properties of CsPbBr3 NCs were reported. One is typical oleic acid with weak electronegativity, and another is 2-acrylamide-2-methylpropionic sulfonic acid with strong electronegativity. The third is their typical mixture with a molar ratio of 1:1. With the increase in ligand electronegativity, the size of CsPbBr3 NCs increases significantly. However, in contrast to the traditional quantum size confinement effect, the PL peak exhibits an abnormal blue shift gradually and the ligand passivation effect on NC surface defects also becomes more significant. The physical mechanism of this anomalous PL shift phenomena of CsPbBr3 NCs was investigated using the time-resolved PL spectrum and transient absorption spectrum.
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页数:5
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