Due to the pronounced emission of many BODIPY derivatives, the direct incorporation of such chromophores within porous frameworks is an intriguing approach toward novel optoelectronic materials. Searching for sensing applications, we evaluated the fluorescence properties of BDP-TFP-COF but did not observe any emission for either BDP(NH2)2 solutions or bulk COF samples. Apparently, the aromatic amine moieties in BDP(NH2)2 and the possibility for weak B-N interactions between NH2 and BF2 groups quench the fluorescence of the unreacted monomer. Furthermore, the H-type aggregation provoked by the face-to-face π-π stacking of adjacent BODIPY moieties in bulk BDP-TFP-COF causes an aggregation-caused quenching (ACQ) of the emission. After sonication of the pristine COF powder in H2O or THF however, a weak red emission emerged (Figures and).