Abstract
We studied dynamic interactions between CdSe/ZnS quantum dots (QDs) and cyclic solvents probed by femtosecond four-wave mixing. We found that the dynamic interactions of QDs strongly depend on the existence of π-bonds in solvent molecules.
Highlights
Colloidal semiconductor quantum dots (QDs) have attracted enormous interest in the past two decade, since they show excellent photoluminescence (PL) properties such as narrow PL linewidth and high quantum efficiency
We studied dynamic interactions between CdSe/ZnS quantum dots (QDs) and cyclic solvents probed by femtosecond four-wave mixing
We studied the dynamic interactions of QDs with cyclic solvents by femtosecond four-wave mixing (FWM) signals, and found that QDs in cyclic solvents show particular dephasing behaviour depending on the existence of -bonds in solvent molecules
Summary
Colloidal semiconductor quantum dots (QDs) have attracted enormous interest in the past two decade, since they show excellent photoluminescence (PL) properties such as narrow PL linewidth and high quantum efficiency. Many researches focus on further improving PL properties by the suppression of blinking phenomena in QDs [2]. Another property, optical coherence of exciton in QDs, has been of great interest from the viewpoint of fundamental physics and applications. We studied the dynamic interactions of QDs with cyclic solvents by femtosecond four-wave mixing (FWM) signals, and found that QDs in cyclic solvents show particular dephasing behaviour depending on the existence of -bonds in solvent molecules. In contrast to previous works on the optical coherence in QDs [3,4], we could observe unexpectedly long dephasing times in solvents with no -bonds, meaning much smaller dynamic interactions of QDs with those solvent molecules. The measured dynamic interactions were compared with the static interaction of QDs such as the peak shifts of PL and absorption bands
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