Abstract
Light-driven control of the fluorescence from Mn-doped ZnSe quantum dots is described by S. Hell and co-workers in their Communication on page 2685 ff. Blue light is used to excite the quantum nanocrystals, while a second longer wavelength modulated beam (red) can be used to selectively gate the fluorescence from the quantum dots. The lower right inset illustrates the energy levels involved in the light-controlled fluorescence from Mn-doped quantum dots.
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