CdSe/ZnS Colloidal Quantum Dots with Alloyed Core/Shell Interfaces: A Photoluminescence Dynamics Study

被引：4
|
作者：
Dziatkowski, K. [1 ,2 ]
Ratchford, D. [1 ]
Hartsfield, T. [1 ]
Li, X. [1 ]
Gao, Y. [3 ]
Tang, Z. [3 ]
机构：
[1] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA
[2] Univ Warsaw, Fac Phys, PL-00681 Warsaw, Poland
[3] Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China
来源：
ACTA PHYSICA POLONICA A | 2011年 / 120卷 / 05期
关键词：
INTENSITY;
D O I：
10.12693/APhysPolA.120.870
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Time-resolved photon counting technique was employed to study dynamics of photoluminescence from the ensemble and single CdSe/ZnS quantum dots with the alloyed core/shell interfaces. The ensemble data revealed enhanced effect of disorder-induced trap states for increasing emission energy, as implied from the changes in the distribution of total decay rates. The emission trajectories collected for single quantum dots showed familiar, two-state blinking pattern. It suggests that in a large-band-offset CdSe/ZnS system, the introduced alloying of the core-to-shell region cannot smooth enough the confinement potential in order to suppress nonradiative Auger recombination and blinking.
引用
收藏
页码：870 / 873
页数：4
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