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- W2070290826 abstract "A series of samples of CdSe/ CdxZn1 − xS core/shell quantum dots have been synthesized in order to measure the influence of lattice-mismatch-induced strain on the photoluminescence (PL) and blinking behaviour. The PL spectra show a significant variation of the fluorescence wavelength even though the colloidal quantum dots (cQDs) are similar in size. The PL excitation spectra show a gradual splitting of the first exciton level as the proportion of Zn is increased in the shell and as the shell grows. On the other hand, blinking studies clearly demonstrate a significant dependence on the amount of Zn present in the shell. Distributions of on and off times go from the usual power-law distributions to power-law distributions with exponential cut-offs. These cut-offs become increasingly pronounced as the proportion of Zn increases. We interpret these results in the framework of diffusion-controlled electron transfer. Exciton relaxation lifetime measurements strongly suggest that lattice mismatch is responsible for a greater number of defects in core/shell cQDs. Therefore, strain and lattice mismatch are shown to be parameters of significant importance for the electronic structure of nanocrystals, influencing the photoluminescence, exciton relaxation lifetime and blinking behaviour." @default.
- W2070290826 created "2016-06-24" @default.
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- W2070290826 date "2010-03-08" @default.
- W2070290826 modified "2023-09-26" @default.
- W2070290826 title "Strain-induced effects in colloidal quantum dots: lifetime measurements and blinking statistics" @default.
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- W2070290826 doi "https://doi.org/10.1088/0957-4484/21/13/134024" @default.
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