Abstract
A novel difluoroboron fluorophore with an electron donor-acceptor conjugated structure was synthesized with 26.5% fluorescence quantum yield, 18 035 GM two-photon absorbing cross-section, and undetectable two-photon fluorescence, resulting in 25% 1O2 quantum yield. The unique optical behavior of CNFBBN enabled one-photon fluorescence imaging and two-photon phototherapy against HeLa cancer cells, irradiated at separate wavelengths.
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