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The emission spectra (λexc = 355 nm) of complexes. cycTb-phEu a, cycEu-phTb b, and cycTb-phen c at 10 K in the solid state. The Tb3+ transitions are marked in red, and those of Eu3+ are marked in blue. Refer to Tables S1 and S2. The relative intensities are not to scale for a–c