PREPARATION AND LUMINESCENCE INVESTIGATION OF MIXED COMPLEXES OF SALICYLAT AND O-PHENANTROLINE WITH SOME HEAVY RARE-EARTH ELEMENTS

Abstract

    Some mixed complexes of heavy rare-earth ions with salicylic acid and o-phenantroline with the general formula Ln(HSal)3.Phen (Ln: Tb, Er, Yb; Hsal-: Salicylate; Phen: o-phenantroline) have been prepared. The luminescence properties of mixed complexes in solid state were investigated by measuring the excitation and emission spectra, the intramolecular ligand-to-rare earth energy transfer mechanisms were discussed. The strong luminescence emitting peaks at 405 nm for Er(III), at 307 nm and 342 nm for Yb(III), from 407 nm to 583 nm with four emission bands for Tb (III) can be observed, which could be attributed to the ligand has an enhanced effect to the luminescence intensity of the Tb (III), Er (III) and Yb (III)..