巯基羧酸对 CdTe 量子点发光性质的影响。
Effect of mercaptocarboxylic acids on luminescent properties of CdTe quantum dots.
机构信息
School of Material Science and Engineering, University of Jinan, 250022, Jinan, People's Republic of China.
出版信息
J Fluoresc. 2012 Jan;22(1):121-7. doi: 10.1007/s10895-011-0937-9. Epub 2011 Aug 18.
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.
CdTe 量子点 (QDs) 是在水溶液中使用各种巯基羧酸，如 3-巯基丙酸 (MPA) 和巯基乙酸 (TGA)，作为稳定剂制备的。实验结果表明，这些稳定剂对 QDs 的性质起着重要作用。虽然 TGA 和 MPA 封端的 CdTe QDs 都表现出从绿色到红色的可调谐光致发光 (PL)，但在最佳制备条件下，TGA 封端的 QDs 的 PL 量子产率 (QY) 高达 60%，而 MPA 封端的 QDs 的 QY 高达 50%（pH 值约为 11.2，TGA/Cd 摩尔比为 1.5）。PL 寿命测量表明，TGA 封端的 QDs 表现出短的平均寿命，而 MPA 封端的 QDs 则表现出长的平均寿命。此外，TGA 封端的 QDs 的平均寿命随着 QDs 尺寸的增加而增加，而 MPA 封端的 QDs 的寿命则降低。这意味着 PL 寿命强烈依赖于 CdTe QDs 的表面状态。这些结果应该用于 QDs 的制备和应用。
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