A stable 3D Tb -based metal-organic framework [Tb(BPDC) ]⋅(CH ) NH (DUT-101) was synthesized, and it is the first efficient dual-channel luminescence sensor for aqueous UO ions. DUT-101 contains an anionic three-dimensional framework and protonated dimethylamine molecules embedded within the channels. The intense green emission of DUT-101 could be highly selectively and sensitively quenched by UO ions even in the presence of other competing metal ions. A possible sensing mechanism was proposed based on both suppression of luminescence resonance energy transfer and enhancement of intermolecular electron transfer. Furthermore, visual green fluorescent test papers based on DUT-101 were fabricated and could be used to discriminate UO ions among various metal ions.
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