Luminescent properties dependence of water-soluble CdTe quantum dots on stabilizing agents and reaction time

The influence of stabilizing agents and reaction time on the luminescent properties of water-soluble CdTe quantum dots (QDs) was discussed. The thioglycolic acid (TGA)-CdTe ODs were characterized by TEM, XRD and FTIR. It is found that larger-size QDs can be synthesized more easily when L -cysteine (...

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Published inJournal of Central South University of Technology. Science & technology of mining and metallurgy Vol. 17; no. 6; pp. 1148 - 1154
Main Authors Li, Zheng, Wang, Yong-xian, Zhang, Guo-xin, Han, Yan-jiang
Format Journal Article
LanguageEnglish
Published Heidelberg Central South University 01.12.2010
Subjects
Engineering
Metallic Materials
luminescent property
reaction time
CdTe quantum dots
stabilizing agent
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ISSN1005-9784
1993-0666
DOI10.1007/s11771-010-0611-4

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Summary:The influence of stabilizing agents and reaction time on the luminescent properties of water-soluble CdTe quantum dots (QDs) was discussed. The thioglycolic acid (TGA)-CdTe ODs were characterized by TEM, XRD and FTIR. It is found that larger-size QDs can be synthesized more easily when L -cysteine (Cys) or golutathione (GSH) is chosen as stabilizing agent and TGA is proper to prepare highly luminescent QDs because of the effect between Cd 2+ and sulfhydryl group. Furthermore, the absorption wavelength, full width at half maximum (FWHM), stokes shift, photoluminescence (PL) quantum yield and PL stability of TGA-CdTe are strongly dependent on reaction time, in which the absorption wavelength changes against reaction time with an exponential function. The TGA-CdTe QDs prepared at 2 h possess more excellent luminescent properties.
ISSN:1005-9784
1993-0666
DOI:10.1007/s11771-010-0611-4