Several new isostructural lanthanide metal-organic frameworks {[Ln3(L)4(OH)(H2O)2]·DMAC}n (Ln = Tb (1), Gd (2), Eu (3), Gd0.81Tb0.10Eu0.09 (4) and Gd0.75Tb0.18Eu0.07 (5)) were designed and prepared. Excitingly, samples 1, 3, 4 and 5 showed reversible Al(3+)-induced chromaticity switching as well as reversible Fe(3+)-induced emission switching.