Light harvesting is a natural phenomenon that scientists try to mimic in artificial systems. Having this in mind, interests have been focused on using new smart-materials for photonics. Herein, we report on the photobehaviour of Zr-NDC MOF and its composite material, Coumarin153@Zr-NDC embedded within a polymeric membrane of poly[bisphenol A carbonate-co-4,4’-(3,3,5-trimethylcyclohexylidene)diphenol carbonate] (PC). For the mixed matrix membrane (MMM) containing Zr-NDC/PC, we observed interparticles excimer-like formation, taking place in times shorter than 15 ps and giving birth to a red-shifted broad emission band. The interparticle interactions are supported by the SEM images, as they reflect the contact between the MOF crystals. The C153@Zr-NDC/PC material presents an energy transfer (ET) process from the excited MOF to trapped C153 molecules in 820 ps, with a 35-nm red-shifted emission band relating to C153 in PC. The fluorescence quantum yield, results of this ET from the MOF, is enough high (25%) to explore the possibility to use this new composite material in a LED device. To elucidate the observed photobehavior, we compared with those of C153/PC and (2,6-NDC + C153)/PC films. These results shed light on the spectroscopic and dynamical properties of this new composite materials formed by a highly fluorescent molecule, and easy-synthesized MOF and polymeric matrixes, opening the way for more research based on these mixed inorganic and organic compounds for possible applications in luminescence sensing and emitting devices fields.
Efficient Light Harvesting within C153@Zr-Based MOF Embedded in a Polymeric Film: Spectral and Dynamical Characterization
M. Gutiérrez, M. López-González, F. Sánchez and A. Douhal.
Physical Chemistry Chemical Physics 2017, 19(27), 17544-17552