Synthesis and properties of a new red luminescence europium complex containing a 2-(benzimidazol-2-yl)-8-octyloxyquinoline as the second ligand

Abstract

A new Eu(III) complex, Eu(III)(DBM)(3) BIOQ, has been synthesized with dibenzoylmethane (DBM) as the first ligand and 2-(benzimidazol-2-yl)-8-octyloxyquinoline (BIOQ) as the second ligand. The stability of the complex was analysed by DSC-TG. The results show that the Eu(III) complex has a relatively high thermal stability with a melting point of 235 °C and a decomposition temperature (onset) of 252 °C. The fluorescence properties of the compound were also investigated. The fluorescence results reveal that the as-prepared complex shows the characteristic maximum emission spectra of Eu(III) at 611 nm (λ(ex) = 350 nm). In addition, the photoluminescence spectrum of the complex in the solid state exhibits a single and symmetrical emission band at 611 nm, with a full width at half-maximum of 4.7 nm, showing high colour purity. This finding indicates the possibility for the development of brighter red luminescent materials.