Dependence of Microstructure and Luminescence on Shell Layers in Colloidal CdSe/CdS Core/Shell Nanocrystals

被引：37
|
作者：
Zhang, Jiaming [2 ,3 ]
Zhang, Xuke [2 ,3 ]
Zhang, J. Y. [1 ]
机构：
[1] Southeast Univ, Coll Elect Sci & Engn, Nanjing 210096, Peoples R China
[2] Henan Agr Univ, Coll Anim Husb & Vet, Zhengzhou 450002, Peoples R China
[3] Vet Med Engn & Technol Res Ctr Henan Prov, Luoyang 471000, Peoples R China
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 09期
关键词：
QUANTUM DOTS; LATTICE CONTRACTION; PHOTOLUMINESCENCE; DECAY; TIME;
D O I：
10.1021/jp9120194
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 US shell but was released when the shell became thicker. The CdSe lattice contraction, photoluminescence (PL) quantum yield, and PL average lifetime exhibit similar dependences oil the shell thickness. The PL lifetime undulation with temperature is indicative of the spatial distribution of trap states.
引用
收藏
页码：3904 / 3908
页数：5
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