Spectral and Dynamical Characterization of Multiexcitons in CdSe/CdS/CdZnS Colloidal Quantum Dots

Abstract

The time-resolved photoluminescence triggered by a ∼30 ps long exciting pulse centered at the time 154 ps was investigated. The use of long pulses allows one not only to trace the decay of multi-exciton complexes, but also to study the process of their formation and, thus, to give a more complete picture of the physical processes occurring in the system. In addition, we excite electron-hole pairs by a laser directly near the p-states. We obtained a series of transient photoluminescence spectra extracted at different delays relative to the center of the exciting laser pulse using a 50 ps integration window.