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Abstract

The fluorescence blinking characteristics of the single CdSe/ZnS core/shell quantum dots (QDs) absorbed on the cover glass surface, indium-tin oxide (ITO) nanoparticles, and polymethyl methacrylate (PMMA) film surface are measured by a laser scanning confocal fluorescence microscopy. It is found that all the distributions of bright state duration time of QDs on the three different interfaces can be described by a truncated power law P(t)∝ t-αexp(-t/μ). The statistical on-time durations of single QDs absorbed on the ITO nanoparticles is shorter than on the glass. In addition, the on-time duration with single QDs absorbed on the PMMA is longer than on the others. These differences can be attributed to the diverse interfacial electron transfers between QD and different materials.

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1.
Funds:Project supported by the State Key Development Program for Basic Research of China (Grant Nos. 2012CB921603, 2010CB923103), the National High Technology Research and Development Program of China (Grant No. 2011AA010801), the National Natural Science Foundation of China (Grant Nos. 11374196, 11174187, 10934004, 11204166), the International Science and Technology Cooperation Program of Ministry of Science and Technology, China (Grant No. 2001DFA12490), the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 61121064), the Cheung Kong Scholars and Innovative Research Team Program in University of Ministry of Education, China (Grant No. IRT13076), and the Specialized Research Foundation for the Doctoral Program of Institution of Higher Education of China (Grant No. 20121401120016).

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Vol. 63, Issue 16 - 2014-08-20

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