The Laser Induced Fluorescence Spectra of Eu(m) and Tb(m) Complexes with Mixed β-diketone and Organic Ligands

The emission spectra and their lifetime of the complexes of Eu(III) and Tb(III) with mixed beta-diketone and organic ligands were studied by laser induced fluorescence technique. The energy levels of the centered metal ions were less affected by different ligands (less than 100cm(-1)), but the lifetimes and the emission intensities of the ions depends on the efficiency of the energy transfer between the ligand anid the ions. The energy levels split in strong ligand fields. The emission spectra of Eu(III) complexes gave a set of energy constants of the F-7 and D-5 states of Eu(III) as following: for F-7 A=305cm(-1), B-0=3660cm(-1); for D-5: A=1744cm(-1), B=27699cm(-1).