Multifunctional luminescence properties of co-doped lanthanide metal organic frameworks

Two novel lanthanide metal organic frameworks [Eu4(bpt)4(DMF)2(H2O)6]·(DMF)5·(H2O)4 () and [Tb4(bpt)4(DMF)2(H2O)8]·(DMF)5·(H2O)3 () were synthesized under hydrothermal conditions, forming a three-dimensional structure (H3bpt = biphenyl-3,4',5-tricarboxylate). Single crystal X-ray diffraction reveals that compounds and are heteromorphic and have different topologies due to the change of metal ions with different radii and coordination steric hindrance. The unique luminescence properties of Eu(3+) and Tb(3+) ions motivated us to dope different amounts of Tb(3+) into a single host to obtain light tunable materials. The tunable multicolor emissions, including red, red-orange, orange, yellow and green, can be readily achieved from the doped Ln-MOFs by increasing the concentration of Tb(3+). In addition, compounds and also exhibit different temperature-dependent luminescence behaviors when the concentration of Eu(3+) is low, generating new Ln-MOF thermometers.