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Photoluminescence quenching of CdTe/CdS core-shell quantum dots in aqueous solution by ZnO nanocrystals |
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| Authors: | Aimin Shi Jianhui Sun Qinghui Zeng Zaicheng Sun Xianggui Kong |
| Affiliation: | a School of Science, Dalian Jiaotong University, Dalian 116028, China b Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Eastern South Lake Road, Changchun 130033, China c Graduate School of Chinese Academy of Sciences, Beijing 100039, China d Institute of Condensed Matter Physics and Materials Science, Jilin Normal University, Siping 136000, China |
| Abstract: | 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. |
| Keywords: | CdTe/CdS core-shell quantum dots ZnO nanocrystals Quantum confinement effect Electron transfer Photoluminescence quenching |
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