Preparation and Characterization of High Quality CdSe Quantum Dots in Aqueous Solution

doi:10.7503/cjcu20120751

Abstract

Abstract:

Using sodium selenite as selenium source and mercaptosuccinic acid(MSA) as stabilizer, high quality CdSe quantum dots(QDs) were conveniently prepared in aqueous solution. The influence of experimental conditions, including refluxing time, cadmium to selenium molar ratio and cadmium to MSA molar ratio, on the luminescent properties of the obtained CdSe QDs were systematically investigated. The obtained QDs were characterized by UV-Vis absorption spectrometry, photoluminescence(PL) spectrometry, X-ray powder diffraction(XRD) and transmission electron microscopy(TEM). The results show that the proposed method lead to the formation of cubic CdSe QDs with narrow fluorescence full width at half maximum(35 nm), high photoluminescence quantum yield(up to 21%), and a broad emission spectra tunable from 518 to 562 nm.

Key words: Semicondutor nanocrystal, Optical property, CdSe quantum dots

CLC Number:

O611.4

TrendMD:

WANG Yi-Lin, YANG Kun, PAN Hua-Qiao, LIU Sheng-Yan, XU Xian-Mei, ZHOU Li-Ya. Preparation and Characterization of High Quality CdSe Quantum Dots in Aqueous Solution[J]. Chem. J. Chinese Universities, 2012, 33(12): 2604.

References

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