Competition between Intraligand Triplet Excited State and LMCT on the Thermal Quenching in β-Diketonate Complexes of Europium(III)

Abstract

Luminescence lifetime measurements of Eu(fod) 3 solutions in carbon tetrachloride, benzene, and acetonitrile were performed at temperatures between 5 and 75 °C. Ligand to metal charge transfer involving Eu(II) formation upon 300 nm steady state irradiations of Eu(fod) 3 solutions, besides the dependence of the difference in energy of the emitting 5 D 0 and the upper level support, photoinduced electron transfer as the main deactivation mechanism in the thermal quenching of the Eu(III) chelate.