Red electroluminescence from a novel europium β-diketone complex with acylpyrazolone ligand

A novel poly-ligand europium β-diketone complex was prepared, which contains ligand of 1-phenyl-3-methyl-4(4-butylbenzoyl)-5-pyrazolone (HPMBBP). Its structure is Eu(TTA)2(PMBBP)Phen. We investigated its PL and EL properties. When it was used as emitting material, the new Eu-complex exhibited intense photoluminescence (PL) and electroluminescence (EL) at 613 nm in a fabricated three-layer electroluminescent device: ITO/TPD/Eu(TTA)2(PMBBP)Phen/Alq3/Mg:Ag. The maximum luminance of 16 cd/m2 from the device was obtained at 12.5 V.