Effect of Mercaptocarboxylic Acids on Luminescent Properties of CdTe Quantum Dots |
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Authors: | Zhimin Yuan Aiyu Zhang Yongqiang Cao Jie Yang Yuanna Zhu Ping Yang |
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Institution: | (1) School of Material Science and Engineering, University of Jinan, 250022 Jinan, People’s Republic of China; |
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Abstract: | CdTe quantum dots (QDs) were prepared in an aqueous solution using various mercaptocarboxylic acids, such as 3-mercaptopropionic
acid (MPA) and thioglycolic acid (TGA), as stabilizing agents. The experimental result indicated that these stabilizing agents
played an important role for the properties of the QDs. Although both TGA and MPA-capped CdTe QDs exhibited the tunable photoluminescence
(PL) from green to red color, the TGA-capped QDs revealed a higher PL quantum yield (QY) up to 60% than that of MPA-capped
QDs (up to 50%) by using the optimum preparation conditions, such as a pH value of ~11.2 and a TGA/Cd molar ratio of 1.5.
PL lifetime measurements indicate that the TGA-capped QDs exhibited a short average lifetime while the MPA-capped QDs revealed
a long one. Furthermore, the average lifetime of the TGA-capped QDs increased with the increase of the QDs size, while a decreased
lifetime for the MPA-capped QDs was obtained. This means that the PL lifetime depended strongly on the surface state of the
CdTe QDs. These results should be utilized for the preparation and applications of QDs. |
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