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The fluorescence spectra of europium ( Ⅲ) complex in Langmuir-Blodgett film were obtained when the sample was irradiated by 355 nm UV light corresponding to a ligand π→π* transition at room temperature. A 115 cm -1 splitting of the 5D1 energy level of europium (Ⅲ) ion was observed. A datailed discussion of intramolecular energy transfer of europium ( Ⅲ ) complex in Langmuir-Blodgett film was given. On the basis of simulating the lifetime of 5D0 state of europium (Ⅲ ) ions, it was found that the population of 5D0 state comes from two pathways: one is directly from the ligand triplet state (T1), and the other is from 5D1 state which is also populated from the ligand triplet state (T1). The branching ratio for these two pathways is 0.18. The kinetics parameters of intramolecular energy transfer of europium (Ⅲ) complex in LB film were also derived.
The fluorescence spectra of europium (Ⅲ) complex in Langmuir-Blodgett film were obtained when the sample was irradiated by 355 nm UV light corresponding to a ligand π → π * transition at room temperature. A 115 cm -1 splitting of the 5D1 energy level A datailed discussion of intramolecular energy transfer of europium (Ⅲ) complex in Langmuir-Blodgett film was given. On the basis of simulating the lifetime of 5D0 state of europium (Ⅲ) ions, it was found that the population of 5D0 state comes from two pathways: one is directly from the ligand triplet state (T1), and the other is from 5D1 state which is populated from the ligand triplet state (T1). The branching ratio for these two pathways is 0.18. The kinetics parameters of intramolecular energy transfer of europium (III) complex in LB film were also derived.