Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (9): 1789.

• Articles • Previous Articles     Next Articles

Structure Transition and Luminescence Properties of CdTe/CdS Quantum Dots

AN Li-Min1,2*, ZENG Qing-Hui3, ZHAO Jia-Long3, SONG Wei-Si1, SU Wen-Hui1*   

  1. 1. Center for the Condensed Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China;
    2. Physics Department of Science and Technology, Heilongjiang University, Harbin 150080, China;
    3. Key Laboratory of Excited State Processes, Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
  • Received:2008-12-08 Online:2009-09-10 Published:2009-09-10
  • Contact: SU Wen-Hui. E-mail: suwenhui@hit.edu.cn; AN Li-Min. E-mail: anlimin@hlju.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 10674034, 60478015, 60771051, 60601014, 20603035)、国家“八六三”计划(批准号: 2006AA03Z335)和黑龙江省教育厅项目(批准号: 11533047)资助.

Abstract:

Water-soluble CdTe/CdS core-shell quantum dots(QDs) with the different shell thickness capped with 3-mercaptopropionic acid were synthesized following the synthetic method of successive ion layer adsorption and reaction. UV-Vis absorption spectroscopy, photoluminescence(PL) spectroscopy, transmission electron microscopy(TEM) and time-resolved luminescence were employed to analyze optical characters of QDs. The CdTe/CdS QDs exhibited a significant red shift of emission peak, FWHM increasing and PL lifetime lengthening when the shell layer grew. The experiments revealed that the CdTe/CdS QDs evolve from type-Ⅰ to type-Ⅱ core-shell structure with the increase of the shell thickness. The lack of PL lifetime lengthening and quantum yield increasing was ascribed to the surface influence of the shell.

Key words: CdTe; CdTe/CdS; Quantum dot; Photoluminescence lifetime

TrendMD: