Dual control: Hybrid silica–nanocrystal–organic dye superstructures comprising fluorescein isothiocyanate (FITC)-doped silica cores, embedded CdTe quantum dots, and an outer silica shell display well-resolved dual fluorescence emission. Multicolor encoding fluorescent probes are generated by modulating the fluorescence intensity ratio of the dual emission by a simple post-encoding strategy (see picture).
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