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The rare earth p-diketone complexes have had a long and useful history.In the few past decades,europium complexes especially p-diketones have been intensively studied owing to their inherent sharp emission peaks and high quantum efficiency.Europiumβ-diketone complexes show distinguished and desirable photo-or electro-luminescence properties.Energym transfer processes and microenvironment effects were found to contribute to the improvement of the luminescence properties of the Eu-complexes.By comparing differentβ-diketone ligand complexes of europium with UV and fluorescence spectra.The maximum absorption of all the complexes occurred in the range of 300-500 nm,which varied greatly with the change of theβ-diketone ligands and thus may be attributed to theπ-π~※transitions of theβ-diketone ligands.This result indicates that the emission of the europium complexes is mainly sensitized by the absorption of theβ-diketone ligands in the UV region rather than directly by the Eu(Ⅲ)ion absorption.