“…The plausible reason behind this behavior may be two‐fold: (i) differences in the coordination environment around the Dy III ion in complexes 1 and 2 , and (ii) attachment of a more chromophoric ligand to Dy III in complex 1 , which can facilitate a more efficient antenna effect in 1 . In complex 3 , three characteristic bands at 468, 518, and 556 nm are observed that correspond to 5 F 3 →( 5 I 8 , 5 F 4 ), 5 S 2 → 5 I 8 , and 5 F 5 → 5 I 8 transitions, respectively (Figure b) . For complex 4 , the emission spectrum exhibits characteristic strong emission bands of Tb III at 494, 545, 581, and 623 nm (Figure c) .…”