Vector polarisability of atomic hydrogen

Frantsuzov, Pavel A.; Khriplovich, I.B.; Жижимов, О Л

doi:10.1088/0022-3700/20/20/002

Cited by 4 publications

(1 citation statement)

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“…[34,45] Further deviations from power-law behaviorh ave been reported upon varying the local environment of the QD, such as changing the immobilization matrix and the proximity of the silanol groups,l eading to exponentialt erms in the distribution function of the on times. [46,47] Recently,amultiple recombination centers model has been proposed [48] to describe blinking, in which the on times can be fit to am ultiexponential decay functionr ather than a( truncated)p ower law. [35] These recent studies have broughti nto question whether the blinking dynamics are indeed power-law distributed, as was generally thought.…”

Section: Resultsmentioning

confidence: 99%

Influence of the Inner‐Shell Architecture on Quantum Yield and Blinking Dynamics in Core/Multishell Quantum Dots

et al. 2016

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Choosing the composition of the shell for QDs is not trivial, since both the band-edge energy offset and interfacial lattice mismatch play roles in influencing the final optical properties. One way to balance these competing effects is by forming multi-shells and/or gradient-alloyed shells. However, this introduces multiple interfaces and their relative effects on quantum yield and blinking are not yet fully understood. Here we undertake a systematic, comparative study of adding inner shells of single composition vs gradient-alloyed shells of cadmium/zinc chalogenides onto CdSe cores, and then capping with a thin ZnS outer shell to form various core/multi-shell configurations. We show that the inner shell architecture between the CdSe core and the outer ZnS shell plays a significant role in both quantum yield and blinking dynamics but that these effects are not correlated – a high ensemble quantum yield doesn’t necessarily equate to reduced blinking. Two mathematical models have been proposed to describe the blinking dynamics – the more common power-law model and a more recent multi-exponential model. By binning the same data with 1 ms and 20 ms resolution, we show that the on-times can be better described by the multi-exponential model while the off-times can be better described by the power-law model. We discuss physical mechanisms that might explain this behavior and how it can be affected by the inner shell architecture.

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