Role of energy transfer and charge trapping on the luminescence properties of europium complexes/luminescent polymers composites

The luminescence properties of composites made of two conjugated luminescent polymers and two europium complexes are presented. We show that the electroluminescence spectra of these composites depend both on the energy transfer involving the host polymer and the ligands of the europium complexes and on the charge localisation effects which can be rationalised in terms of the energetic position of the frontier levels of the polymer and of the Eu-complex.