Abstract
The study of the spatial photon migration as a function of the concentration brings into attention the problem of the energy transfer in quantum dot (QD) embedded systems. By measuring the photon propagation and its spatial dependence it is possible to understand the whole dynamics in a QD system, and also improve their concentration dependence to maximize energy propagation due to radiative and non-radiative processes. Core-shell quantum dots CdSe-ZnS in decane colloidal solutions were used to explore energy transfer phenomena. A confocal microscope was adapted to scan the spatial distribution of emitted luminescence from the samples. The energy migration provided by the luminescence spatial distribution was measured as photon propagation according to the diffusion theory. We observed that the photon migration length (PML) decreases by increasing the QD concentration. At high concentrations, this process is regarded as a signature of Förster resonance energy transfer (FRET) from the donor QDs to the acceptor QDs.
© 2013 Optical Society of America
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