Estudo das propriedades óptico-eletrônicas de compósitos de PVK com composto de coordenação de lantânio (III)

Abstract

We conduct at this work, the study of the optical and electronic properties of the N,N'-bis (salicylidene), with their coordination compound of lanthanum (III) - La (III), in solution and in the solid state, to evaluate its potential in a possible application in organic semiconductor devices. The samples of salicylidene and their, coordination compound of La(III); were synthesized by the classical methodology. The salicylidenes are Schiff bases and can be used as active layer, dopants or ligands; when coordinated to transition metals because they generate coordination compounds fluorescent or phosphorescent, such as compound of La(III). In this work were synthesized: N, N'-bis (salicylidene) -3,4-diaminobenzophenone - sal-3.4-benzophen (KG-21), and its compound La (III); bis[N,N'-bis(salicylidene)-3,4- diaminobenzophenone] lantâniato(III) sodium, Na[La(sal-3,4-benzophen)2]; Na[La(KG-21)2]. The study of the properties was performed out through the structural and photophysic characterization the free ligand and their coordination compounds of La(III); in solutions, dimethylsulfoxide (DMSO), Chloroform (CHCl3) and also in solid state as thin films using the technique Casting and Spin-Coating. In the structural characterization was utilized the techniques FTIR vibrational spectroscopy and electronics spectroscopy (UV-vis), whereas in the photophysical characterization techniques were used fluorescence stationary and timeresolved. According to the literature other rare earth trivalent ions, Europium, Terbium and Thulium, it has been used as light emitting centers, in organic semiconductor devices, there are studies indicating their use as active layer electroluminescent. Thus the compound of La (III) has good optical properties for use in devices of type: Organic Light Emitting Diode (OLED), solar cell Organic Photovoltaic (OPV) and Biosensor.