Influence of Resonant Excitation and Carrier Lifetime on the Optical Properties of Coupled CdSe Quantum Dots
J. Korean Phy. Soc. 2008; 53: 106~109
Published online July 15, 2008 © 2008 The Korean Physical Society.

Abstract
We studied the time-integrated and time-resolved photoluminescence (PL) from coupled quantum dot (QD) systems (CdSe/CdZnMnSe and CdSe/CdMnSe), which exhibited an antiferromagnetic interaction between the QDs in adjacent layers. We observed a peculiar PL peak shift with an excitation wavelength close to the bandgap of the CdSe QDs, which was attributed to a resonant excitation condition. We found that the PL lifetimes of these structures were significantly influenced by non-radiative recombination processes and that the temperature dependence of the PL intensity was strongly correlated with the PL lifetime.
Keywords: Carrier lifetime, Optical properties, CdSe quantum dot, Resonance


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