Quantum dot blueing and blinking enables fluorescence nanoscopy
Authors: Hoyer P, Staudt T, Engelhardt J, Hell SW
CellNetworks People: Hell Stefan
Journal: Nano Lett. 2011 Jan 12;11(1):245-50. doi: 10.1021/nl103639f

We demonstrate superresolution fluorescence imaging of cells using bioconjugated CdSe/ZnS quantum dot markers. Fluorescence blueing of quantum dot cores facilitates separation of blinking markers residing closer than the diffraction barrier. The high number of successively emitted photons enables ground state depletion microscopy followed by individual marker return with a resolving power of the size of a single dot (∼12 nm). Nanoscale imaging is feasible with a simple webcam.