Abstract
Natural polymers have been increasingly explored for a wide range of applications as smart materials due to their unique properties, abundance, and sustainability attributes. In the present work, novel luminescent composite films based on sodium alginate (SA) and different amounts of the compounds sodium tetra(2-thenoyltrifluoroacetonate)europate (III) (Na[Eu(tta)4]) (5, 10 and 20% wt.) and 1-butyl-3-methylimidazolium tetra(2-thenoyltrifluoroacetonate)europate (III) [Bmim][Eu(tta)4] (20% wt.) have been processed in a facile way by solvent casting. The films exhibit intense red/orange emission when irradiated with ultraviolet (UV) light at 388 nm. The addition of the luminescent compounds led to the loss of SA porosity and to the increase of its surface roughness. In addition, doping led to an increase in the thermal stability of SA, a decrease in its Young Modulus, and an increase in its electrical conductivity. The high technological potential of these eco-friendly composites for anti-counterfeiting applications has been proved. Moreover, the developed materials lend themselves as electroluminescent soft actuators.
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