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

• Authors: K. Dziatkowski , D. Ratchford , T. Hartsfield , X. Li , Y. Gao , Z. Tang
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

78.67.Hc; 78.47.jd; 78.55.Et

Discipline

• 78.47.jd: Time resolved luminescence
• 78.55.Et: II-VI semiconductors
• 78.67.Hc: Quantum dots

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2011
• Volume: 120
• Issue: 5
• Pages: 870-873

Dates

published

2011-11

Contributors

author

K. Dziatkowski

• Department of Physics, University of Texas at Austin, Austin TX 78712, USA
• Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

author

D. Ratchford

• Department of Physics, University of Texas at Austin, Austin TX 78712, USA

author

T. Hartsfield

• Department of Physics, University of Texas at Austin, Austin TX 78712, USA

author

X. Li

• Department of Physics, University of Texas at Austin, Austin TX 78712, USA

author

Y. Gao

• National Center for Nanoscience and Technology, 100190 Beijing, P.R. China

author

Z. Tang

• National Center for Nanoscience and Technology, 100190 Beijing, P.R. China

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Identifiers

DOI

10.12693/APhysPolA.120.870