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

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Abstract

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 Cd2+ 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.

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Authors and Affiliations

  1. Radiopharmaceutical Centre, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China

    Zheng Li  (李峥), Yong-xian Wang  (汪勇先), Guo-xin Zhang  (张国欣) & Yan-jiang Han  (韩彦江)

  2. Chinese Academy of Sciences, Graduate University, Beijing, 100039, China

    Zheng Li  (李峥) & Yan-jiang Han  (韩彦江)

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  1. Zheng Li  (李峥)
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  2. Yong-xian Wang  (汪勇先)
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  3. Guo-xin Zhang  (张国欣)
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  4. Yan-jiang Han  (韩彦江)
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Correspondence to Yong-xian Wang  (汪勇先).

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Foundation item: Projects(10805069, 10405034) supported by the National Natural Science Foundation of China

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Li, Z., Wang, Yx., Zhang, Gx. et al. Luminescent properties dependence of water-soluble CdTe quantum dots on stabilizing agents and reaction time. J. Cent. South Univ. Technol. 17, 1148–1154 (2010). https://doi.org/10.1007/s11771-010-0611-4

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  • DOI: https://doi.org/10.1007/s11771-010-0611-4

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