红色至近红外发射的CdTe(x)Se(1−x)/CdZnS核壳量子点的合成与光致发光

Synthesis and Photoluminescence of Red to Near-Infrared-Emitting CdTe( x) Se(1−x) /CdZnS Core/Shell Quantum Dots.

作者信息

Ma Qian, Yang Fanghong, Zhu Yuanna, Wang Junpeng, Che Quande, Shi Ruixia, Yang Ping

出版信息

J Nanosci Nanotechnol. 2017 Jan;17(1):488-94. doi: 10.1166/jnn.2017.10501.

DOI:10.1166/jnn.2017.10501

Abstract

Red to near-infrared (NIR)-emitting ternary-alloyed CdTe (x) Se(1−x) (x = 0–0.3) quantum dots (QDs) with tetrapod and dot morphologies have been synthesized by a facile method using oleic acid (OA) as single capping agent. The controlled dot-shaped and tetrapod-shaped CdTe( x) Se(1−x) QDs can be successfully obtained by adjusting the content of Te element. It is clear that CdTe (x) Se(1−x) QDs display the tunable emission peaks from the visible light (613.4 nm) to the NIR range (791.6 nm). With an inorganic CdZnS shell coated on the surface of CdTe(0.1)Se(0.9) cores, the stability and PL efficiency of the resulting core/shell QDs can be improved dramatically, accompanied with the red-shift of emission peaks to longer wavelength (795.6 nm). Peculiarly, a large blue shift of emission spectrum of CdTe(0.3)Se(0.7)/CdZnS core/shell QDs is observed, which is mainly ascribed to the shrink of the size of QDs by the fracture of tetrapod arms.

摘要

采用油酸（OA）作为单一封端剂的简便方法，合成了具有四足和点状形态、发射红光至近红外（NIR）的三元合金CdTe(x)Se(1−x)（x = 0–0.3）量子点（QDs）。通过调节Te元素的含量，可以成功获得可控的点状和四足状CdTe(x)Se(1−x)量子点。显然，CdTe(x)Se(1−x)量子点显示出从可见光（613.4 nm）到近红外范围（791.6 nm）的可调发射峰。在CdTe(0.1)Se(0.9)核表面包覆无机CdZnS壳层后，所得核壳量子点的稳定性和PL效率可显著提高，同时发射峰红移至更长波长（795.6 nm）。特别地，观察到CdTe(0.3)Se(0.7)/CdZnS核壳量子点的发射光谱出现大的蓝移，这主要归因于四足臂断裂导致量子点尺寸缩小。