Luminescence of polymer electrolytes containing europium (III)

The excitation and emission spectra of polymeric matrices—poly(ethylene oxide), PEO, and poly(propylene oxide), PPO—containing different concentrations of EuBr₃ were recorded and most of the observed transitions identified. The Stark components of the ⁷F₀₋₄, ⁵D₀ levels and the corresponding barycenters were calculated based on the emission lines assignment to the ⁵D_0,1 → ⁷F₀₋₄ transitions. The spectra were discussed in terms of a C_2v local Eu³⁺ coordination. The relative intensity of the ⁵D₀ → ⁷F₂ hypersensitive transition was related to the electrolyte morphological changes due to increasing europium concentration.