Luminescence tuning of MOFs via ligand to metal and metal to metal energy transfer by co-doping of 2∞[Gd2Cl6(bipy)3]·2bipy with europium and terbium

• DOI: 10.1039/c2jm15571k
• Publication Date: 2012-01-25T11:08:36Z
• Authors: P. R. Matthes; C. J. Höller; M. Mai; J. Heck; S. J. Sedlmaier; S. Schmiechen; C. Feldmann; W. Schnick; K. Müller-Buschbaum
• Keywords: Terbium; Europium; Bipyridine

The series of anhydrous lanthanide chlorides LnCl3, Ln = Pr–Tb, and 4,4′-bipyridine (bipy) constitute isotypic MOFs the formula 2∞[Ln2Cl6(bipy)3]·2bipy. europium terbium containing compounds both exhibit luminescence referring trivalent ions, giving a red for Eu3+ green Tb3+ triggered by an efficient antenna effect linkers. Mixing different lanthanides in one MOF structure was undertaken to investigate potential this system colour tuning luminescence. Based on gadolinium compound, co-doping with amounts proves successful yields solid solutions 2∞[Gd2−x−yEuxTbyCl6(bipy)3]·2bipy (1–8), 0 ≤ x, y 0.5. exhibits opportunity emission in-between red. Depending atomic ratio Gd:Eu:Tb, yellow region covered first time oxygen/carboxylate-free system. In addition ligand metal energy transfer (LMET) from lowest ligand-centered triplet state 4,4′-bipyridine, (MMET) between 4f-levels is as well vital colour. However, no involvement Gd3+ transfers observed rendering it suitable host lattice ion connectivity centre diluting other two rare earth ions state. materials retain their during activation microporosity.