Influence of ionic liquid anion nature on the properties of Eu-containing luminescent materials

The 1-methyl-3-tetradecyl imidazolium ionic liquid (IL) with N(CN)2−, CF3SO3− and N(CF3SO2)2− anions doped with 1 mol% of [EuCl2Phen2(H2O)2]Cl·H2O complex were prepared and investigated. It was found that relatively large IL anion molecular volume promotes the formation of micro particles of europium complex. The influence of the IL anion nature on the optical properties of europium complex was studied by the analysis of the luminescence spectra and lifetime of europium excited states. The high coordinating ability of IL anions towards europium ion along with high temperature of obtaining of Eu-containing ILs produce the improvement of its luminance.