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Keywords:

  • Ionic liquids;
  • Tridentate li­gands;
  • Luminescence;
  • Europium;
  • Lanthanides;
  • Energy transfer

Abstract

A new poly(ionic liquid) (Terpy-PIL) carrying a terpyridine group in each repeating unit of the polymer architecture was readily prepared by polymerization of the monomer (Terpy-IL), which was initiated by azobis(isobutyronitrile) (AIBN). The obtained poly(ionic liquid) can coordinate and sensitize europium(III) ions through numerous chelating terpyridine moieties, which are linked to the polymer chains. A red-emitting luminescent material was obtained by the complexation of europium(III) salts with Terpy-PIL, and the luminescence is due to an energy transfer from the terpyridine moieties to Eu3+ ions. The luminescence performance of the luminescent material based on Terpy-PIL, for example the 5D0 quantum efficiency and the decay time, is much higher than that of the luminescent material prepared from the monomer Terpy-IL, which can be ascribed to the confinement of the europium(III)–terpyridine complexes to the polymer architecture.