Synthesis and Characterization Red Emitting Iridium (III) Complex with 2-(4-cynophenyl)-4 Phenyl quinoline for PhOLEDs

Abstract

A new red light emitting highly efficient Ir(III) complex Ir(CN-DPQ)2(acac), was synthesized for phosphorescent organic light-emitting diodes (PhOLEDs), and their photo physical, structural properties were investigated. The Ir(III) complex, including acetyl acetone (acac) as ancillary ligand, are comprised with 2-(4-cynophenyl)-4 Phenyl quinoline (CN-DPQ),main ligands. The synthesized iridium metal complex, Ir(CN-DPQ)2(acac), and ligand (CN-DPQ) were characterized by different techniques, e.g., Fourier transform infra-red spectroscopy (FTIR), the thermo gravimetric analysis (TGA) and the differential thermal analysis (DTA), UV-visible absorption and photoluminescence spectra. FTIR spectra confirms the presence of chemical groups such as C=O, NH, or OH in the synthesized complex and ligand and TGA/DTA curve revels that the synthesized complex is thermally stable up to 350 0 C .The synthesized 2-(4-cynophenyl)-4 Phenyl quinoline (CN-DPQ) phosphor when excited at 388 nm, demonstrate emission in blue region at 442 nm in formic acid with CIE co-ordinate X=0.1592 & Y=0.0786. A red emitting PL peaks at 626 nm in powder, 628 nm inTHF,631 nm in DCM and 638 nm in acetic acid solution was observed. It is proposed that the synthesized complex Ir(CN-DPQ)2(acac) may be efficiently used as the red emitter materials and CN-DPQ organic phosphor may be efficiently used as the blue emitter materials in Organic Light-Emitting Diodes (OLEDs). It is promising candidates for potential applications in organic light-emitting diodes (OLEDs), light-emitting electrochemical cells and solid-state organic lighting applications. The synthesized quinoline-based iridium complex are promising candidates for efficient red emitters in PhOLEDs