Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524


J. Korean Phy. Soc. 2008; 53(1): 106-109

Published online July 15, 2008

Copyright © The Korean Physical Society.

Influence of Resonant Excitation and Carrier Lifetime on the Optical Properties of Coupled CdSe Quantum Dots

Eunsoon Oh, Dong Gi Choi, Jung Hyun Park, Tae Kyu Lee, Sanghoon Lee and J. K. Furdyna


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