Syntheses, structures, tunable emission and white light emitting Eu3+ and Tb3+ doped lanthanide metal–organic framework materials

Abstract

A series of novel lanthanide metal–organic frameworks, namely, {[Ln₂(L)₂]·(H₂O)₃·(Me₂NH₂)₂}_n (Ln = La (1), Ce (2), Pr (3), Nd (4), Sm (5), Eu (6), Gd (7), Tb (8), Ho (9), Er (10)), have been synthesized with hydro(solvo)thermal conditions based on a flexible multicarboxylic acid (H₄L = 5-(3,5-dicarboxybenzyloxy)isophthalic acid). Single crystal X-ray diffraction reveals that all of them are isomorphous and possess a (6,6) topological net with a Schläfli symbol of {4⁸·6⁷}. Considering the blue-emission of compound 1 and the intense emission of the Eu and Tb compounds, we successfully construct isostructural Eu³⁺ doped Tb compounds whose color can be tuned easily by adjusting the different concentration of the doped ions, and we also obtained white light emitting materials through the doping of Eu and Tb ions in the La compounds.