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Issue 5, 2015
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Synthesis and enhanced fluorescence of Ag doped CdTe semiconductor quantum dots

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Abstract

Doping with intentional impurities is an intriguing way to tune the properties of semiconductor nanocrystals. However, the synthesis of some specific doped semiconductor nanocrystals remains a challenge and the doping mechanism in this strongly confined system is still not clearly understood. In this work, we report, for the first time, the synthesis of stable and water-soluble Ag-doped CdTe semiconductor quantum dots (SQDs) via a facile aqueous approach. Experimental characterization demonstrated the efficient doping of the Ag impurities into the CdTe SQDs with an appropriate reaction time. By doping 0.3% Ag impurities, the Stokes shift is decreased by 120 meV, the fluorescence intensity is enhanced more than 3 times, the radiative rate is enhanced 4.2 times, and the non-radiative rate is efficiently suppressed. These observations reveal that the fluorescence enhancement in Ag-doped CdTe SQDs is mainly attributed to the minimization of surface defects, filling of the trap states, and the enhancement of the radiative rate by the silver dopants. Our results suggest that the silver doping is an efficient method for tuning the optical properties of the CdTe SQDs.

Graphical abstract: Synthesis and enhanced fluorescence of Ag doped CdTe semiconductor quantum dots

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Publication details

The article was received on 30 Sep 2014, accepted on 11 Dec 2014 and first published on 12 Dec 2014


Article type: Paper
DOI: 10.1039/C4NR05731G
Nanoscale, 2015,7, 1970-1976

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    Synthesis and enhanced fluorescence of Ag doped CdTe semiconductor quantum dots

    S. Ding, S. Liang, F. Nan, X. Liu, J. Wang, L. Zhou, X. Yu, Z. Hao and Q. Wang, Nanoscale, 2015, 7, 1970
    DOI: 10.1039/C4NR05731G

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