Incorporation of metal-ligand (M-L) coordination functionality into polymeric backbones has proved to be of significance in the area of self-healing materials.[1-4] These materials can reversibly switch their properties as a result of the reversible association-dissociation in dynamic M-L bonds. Notably, the unique photoluminescence of lanthanide (Ln) is anticipated to offer numerous new opportunities for applications in chemical sensing, biomedicine, tissue engineering, solid state lighting and optical amplifiers. We have investigated and will present a versatile route to luminescent fluids and metallogels. In this presentation, we mainly focus on the strategic preparation of light-emitting lanthanide complexes, luminescence tuning and their stimuli-induced optical responses as potential smart materials.  M. Burnworth, L. M. Tang, J. R. Kumpfer, A. J. Duncan, F. L. Beyer, G. L. Fiore, S. J. Rowan, C. Weder, Nature 2011, 472, 334.  N. Holten-Andersen, M. J. Harrington, H. Birkedal, B. P. Lee, P. B. Messersmith, K. Y. C. Lee, J. Herbert Waite, PNAS 2011, 108, 2651.  D. W. R. Balkenende, S. Coulibaly, S. Balog, Y. C. Simon, G. L. Fiore, C. Weder, J. Am. Chem. Soc. 2014, 136, 10493.  D. Mozhdehi, S. Ayala, O. R. Cromwell, Z. Guan, J. Am. Chem. Soc. 2014, 136, 16128.