Photoluminescence quenching of CdTe/CdS core-shell quantum dots in aqueous solution by ZnO nanocrystals

被引：23
|
作者：
Shi, Aimin [1 ]
Sun, Jianhui [2 ,3 ]
Zeng, Qinghui [2 ]
Shao, Cong [2 ,3 ]
Sun, Zaicheng [2 ]
Li, Haibo [4 ]
Kong, Xianggui [2 ]
Zhao, Jialong [2 ]
机构：
[1] Dalian Jiaotong Univ, Sch Sci, Dalian 116028, Peoples R China
[2] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Key Lab Excited State Proc, Changchun 130033, Peoples R China
[3] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
[4] Jilin Normal Univ, Inst Condensed Matter Phys & Mat Sci, Siping 136000, Peoples R China
来源：
JOURNAL OF LUMINESCENCE | 2011年 / 131卷 / 07期
基金：
中国国家自然科学基金;
关键词：
CdTe/CdS core-shell quantum dots; ZnO nanocrystals; Quantum confinement effect; Electron transfer; Photoluminescence quenching; CDSE NANOCRYSTALS; ENERGY-TRANSFER; SOLAR-CELLS; HOLE TRANSPORT; SEMICONDUCTORS; DYNAMICS; COLLOIDS; CLUSTERS; EXCITON; SOLIDS;
D O I：
10.1016/j.jlumin.2011.02.008
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Photoluminescence (PL) properties of 3-mercaptopropionic acid (MPA) coated CdTe/CdS core-shell quantum dots (QDs) in aqueous solution in the presence of ZnO colloidal nanocrystals were studied by steady-state and time-resolved PL spectroscopy. The PL quenching of CdTe/CdS core-shell QDs with addition of purified ZnO nanocrystals resulted in a decrease in PL lifetime and a small red shift of the PL band. It was found that CdTe(1.5 nm)/CdS type II core-shell QDs exhibited higher efficiency of PL quenching than the CdTe(3.0 nm)/CdS type I core-shell QDs, indicating an electron transfer process from CdTe/CdS core-shell QDs to ZnO nanocrystals. The experimental results indicated that the efficient electron transfer process from CdTe/CdS core-shell QDs to ZnO nanocrystals could be controlled by changing the CdTe core size on the basis of the quantum confinement effect. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：1536 / 1540
页数：5
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