Dependence of Microstructure and Luminescence on Shell Layers in Colloidal CdSe/CdS Core/Shell Nanocrystals
Dependence of Microstructure and Luminescence on Shell Layers in Colloidal CdSe/CdS Core/Shell Nanocrystals
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DOI：
10.1021/jp9120194
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发表时间：
2010-02
影响因子：
3.7
通讯作者：
Jiaming Zhang;Xuke Zhang;J. Zhang
中科院分区：
文献类型：
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作者：
Jiaming Zhang;Xuke Zhang;J. Zhang
将CdS壳层包覆于胶体CdSe纳米晶（NC）表面，通过X射线衍射和拉曼光谱分析，发现随着CdS壳层的生长，CdSe核中的应力显著增加，但随着壳层厚度的增加，应力逐渐释放.的CdSe晶格收缩，光致发光（PL）的量子产率，和PL的平均寿命表现出类似的依赖于壳层厚度。PL寿命随温度的波动指示了陷阱态的空间分布。
Colloidal CdSe nanocrystals (NCs) were successively overcoated with CdS shells, and the X-ray diffraction and Raman measurements of the yielded CdSe/CdS core/shell NCs revealed that stress in the CdSe core was dramatically increased with the growth of the CdS shell but was released when the shell became thicker. The CdSe lattice contraction, photoluminescence (PL) quantum yield, and PL average lifetime exhibit similar dependences on the shell thickness. The PL lifetime undulation with temperature is indicative of the spatial distribution of trap states.