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Measurements on biological samples are often hampered by auto-fluorescence from inherent compounds in tissue or cells, limiting the achievable contrast. Both the signal of interest and the auto-fluorescence are usually detected on the Stokes side of the excitation laser. In this communication, we present two new microscopy modalities, based on the emission of a red-emitting DNA-stabilized silver nanocluster (DNA-AgNC). Its bright fluorescence can be generated on the anti-Stokes side of the readout laser, allowing easy spectral separation of the signal of interest from the Stokes side auto-fluorescence.

Anti-Stokes fluorescence microscopy using direct and indirect dark state formation