Yang Ping, Cao Yongqiang, Li Xiaoyu, Zhang Ruili, Liu Ning, Zhang Yulan
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, Key Laboratory of Inorganic Functional Materials of Shandong Universities, School of Material Science and Engineering, University of Jinan, 250022, Jinan, People's Republic of China.
Luminescence. 2014 Aug;29(5):407-11. doi: 10.1002/bio.2560. Epub 2013 Aug 15.
Alloy CdTe(1-x)Se(x) quantum dots (QDs) have been fabricated by an organic route using Cd, Te and Se precursors in a mixture of trioctylamine and octadecylphosphonic acid at 280 °C. The variation of photoluminescence (PL) peak wavelength of the CdTe(1-x)Se(x) QDs compared with CdTe QDs confirmed the formation of an alloy structure. The Se component drastically affected the stability of CdTe(1-x)Se(x) QDs. A Cd0.5Zn0.5S shell coating on CdTe(1-x)Se(x) cores was carried out using oleic acid as a capping agent. CdTe(1-x)Se(x)/Cd0.5Zn0.5S core/shell QDs revealed dark red PL while a yellow PL peak was observed for the CdTe(1-x)Se(x) cores. The PL efficiency of the core/shell QDs was drastically increased (less than 1% for the cores and up to 65% for the core/shell QDs). The stability of QDs in various buffer solutions was investigated. Core/shell QDs can be used for biological applications because of their high stability, tunable PL and high PL efficiency.
采用有机路线，在280°C下，于三辛胺和十八烷基膦酸的混合物中，使用镉、碲和硒前驱体制备了合金CdTe(1-x)Se(x)量子点（QDs）。与CdTe量子点相比，CdTe(1-x)Se(x)量子点的光致发光（PL）峰值波长的变化证实了合金结构的形成。硒组分极大地影响了CdTe(1-x)Se(x)量子点的稳定性。以油酸为封端剂，在CdTe(1-x)Se(x)核上进行了Cd0.5Zn0.5S壳层包覆。CdTe(1-x)Se(x)/Cd0.5Zn0.5S核壳量子点呈现深红色光致发光，而CdTe(1-x)Se(x)核则观察到黄色光致发光峰。核壳量子点的光致发光效率大幅提高（核的光致发光效率小于1%，核壳量子点高达65%）。研究了量子点在各种缓冲溶液中的稳定性。核壳量子点因其高稳定性、可调谐光致发光和高光致发光效率而可用于生物应用。
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