Hydrothermal synthesis, crystal structures and photoluminescence properties of mixed europium-yttrium organic frameworks

Three mixed europium-yttrium organic frameworks: Eu2-xYx(Mel)(H2O)(6) (Mel=mellitic acid or benzene-1,2,3,4,5,6-hexacarboxylic acid, x=0.38 1, 0.74 2, and 0.86 3) have been synthesized and characterized. All the compounds contain a 3-D net with (4, 8)-flu topology. The study indicates that the photoluminescence properties are effectively affected by the different ratios of europium and yttrium ions, the quantum efficiency is increased and the Eu3+ lifetime becomes longer in these MOFs than those of the Eu analog. (C) 2011 Elsevier Inc. All rights reserved.