“…The emission spectrum of Tb–DMBDC displays four characteristic emission peaks at 494, 547, 585, and 618 nm, which can be assigned to the characteristic transitions 5 D 4 → 7 F 6 , 7 F 5 , 7 F 4 , and 7 F 3 of Tb 3+ , respectively . Similarly, Eu–DMBDC exhibits emissions peaks at 590, 613, and 691 nm, which arise from the 5 D 0 → 7 F J ( J = 1, 2, 4) transitions of Eu 3+ ions . As expected, the mixed-node Ln-MOFs (Eu X Tb 1– X –DMBDC) simultaneously show the characteristic emissions of the Tb 3+ and Eu 3+ ions (Figure d), which further supports the successful incorporation of both ions in the mixed-node Ln-MOFs.…”