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• W1994214229 abstract "Fluorescence imaging is a promising technique for the detection of individual cell migration. Its sensitivity is, however, limited by a high tissue autofluorescence and a poor visible light penetration depth. In order to solve this problem, the fluorescence signal peak wavelength should lie in an absorption and diffusion free region and should be distinguishable, either spectrally or temporally, from the autofluorescence background. We present, here, the synthesis and characterization of low toxicity Zn–Cu–In–Se/ZnS core/shell quantum dots. Their fluorescence emission wavelength peaks around 800 nm, where the absorption and scattering of tissues are minimal. They are coated with a new ligand, which yields small, stable, and bright individual probes in the live cell cytoplasm, even 48 h after the labeling. Furthermore, these near-infrared-emitting quantum dots have a long fluorescence lifetime component (around 150 ns) compared to autofluorescence (<5 ns ). Taking the advantage of this property and coupling these probes to a time-gated detection, we demonstrate efficiently the discrimination between the signal and short lifetime fluorescence such as the autofluorescence. This technique is supported by a method we developed, to massively stain cells that preserves the quantum dot stability and brightness for 48 h." @default.
• W1994214229 created "2016-06-24" @default.
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• W1994214229 date "2014-01-06" @default.
• W1994214229 modified "2023-10-14" @default.
• W1994214229 title "Time-gated cell imaging using long lifetime near-infrared-emitting quantum dots for autofluorescence rejection" @default.
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• W1994214229 doi "https://doi.org/10.1117/1.jbo.19.5.051208" @default.
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