Synthesis and characterization a novel europium(III)-β-diketonate complex with carbazole and triphenylamine moieties

A novel β-diketonate ligand with triphenylamine and carbazole moieties named: 1-(4-diphenylamino-phenyl)-3-(9-ethyl-9H-carbazol-3-yl)-propane-1,3-dione (HL), was synthesized by the Claisen condensation reaction and its corresponding europium complex Eu(L)3phen was prepared. The structures of the ligand and complex were characterized by IR spectra, 1H NMR, elemental analysis (EA), UV–Vis spectra and ESI-MS. The photoluminescence (PL) spectra shows that the ligand has an excellent antenna effect to sensitize the Eu3+ and the complex has good quantum efficiency which indicates that the complex is a good candidate as emitter in fabricating organic light-emitting diodes (OLEDs). Thermogravimetric (TG) analysis shows that the complex possesses high thermal stability and good film-forming ability to generate the OLEDs.