PREPARARION AND LUMINESCENCE INVESTIGATION OF PICOLINATE COMPLEXES OF SOME RARE EARTH ELEMENTS

Abstract

    Some complexes salicylates of  rare earth ions with the general formula Na[Ln(Pic)4 (Ln3+: Nd3+, Sm3+, Eu3+, Gd3+; Pic-: picolinate) have been prepared. The luminescence properties of these 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 emission spectra of the Nd(III), Gd(III) complexes displayed only narrow bands arising from  443/29/2FIand 687/27/2PS transition, respectively. On the other hand, the emission spectrum  of the Sm (III)  complex displayed  four bands  arising from 465/25/2GH, 465/27/2GH, 465/29/2GH,465/211/2GH transitions. The emission spectrum  of the Eu (III)  complex displayed  five bands  arising from 5700DF, 5701DF, 5702DF,5703DF, 5704DF transitions.