Brightly fluorescent conjugated polymer nanoparticles (CPNs) become virtually non-fluorescent when doped with reverse photochromic dyes that are effective fluorescent quenchers. CPN fluorescence is activated with visible light, which induces photochromic conversion of the dye to a non-quenching form. Both reversible and irreversible fluorescence activation can be achieved by altering irradiation conditions and CPN design. The magnitude of fluorescence activation is controlled by the position of the equilibrium between the two photochromic forms of the dye. Although the quenching form of the dye can be excited directly or indirectly via the CPN, only indirect excitation is effective for fluorescence activation. The photophysical features of this system that enable efficient fluorescence activation via excitation of the CPN are explored.

Fluorescence activation by visible light in conjugated polymer nanoparticles

255th National Meeting (2018)

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