Color tunable and white light emitting lanthanide metal-organic framework materials

Abstract

Abstract In our previous work, a family of isostructural lanthanide metal-organic frameworks, [Ln3(L)3(H2O)2]·(H3O)3·(H2O)4·(DMF)3 (abbreviated as Ln3(L)3(H2O)2, Ln = Eu, Tb, Sm, Dy and Gd) were synthesized under solvothermal conditions based on a semi-rigid tetravalent carboxylic tetracarboxylic acid (3,3′,5,5′-biphenyltetracarboxylic acid, H4L). Due to the good sensitization of the H4L ligand, Ln3(L)3(H2O)2 all show the intense characteristic emission bands of the corresponding lanthanide ions. The optical properties of Ln3(L)3(H2O)2 can be easily tuned by doping different lanthanide ions into the same host frameworks. Moreover, white-light emission can be successfully realized for four kinds of codoped compounds Tb0.005Eu0.005Gd0.990L, Dy0.006Eu0.006Gd0.988L, Dy0.0002Sm0.001Gd0.9988L and Tb0.002Sm0.006Gd0.992L (the value refer to the starting molar ratios of Ln3+ ions).