Abstract
Blinking dynamics of single CdSe/ZnS quantum dots are analyzed by change point analysis, which gives access to intermediate photoluminescence (PL) intensities observed during PL intermittency. The on-times show systematic deviations from a (truncated) power law. This deviation is manifested in variations of the PL intensity distribution and is related with well defined PL intensity jumps. Varying the matrix from polystyrene (PS) to polyvinyl alcohol (PVA) changes the on-time blinking dynamics and reveals coupling of the QDs either to OH-groups of the SiOx interface or to OH-groups of PVA. Analysis of dwell times in respective intensity correlated traps reveals that OH-related traps are strongly stabilized with much longer dwell times as compared to otherwise broadly distributed trap states.
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