Synthesis and Electroluminescent Property of Phosphorescent Red Iridium complexes for red OLEDs and white oleds

Abstract

Mapo-gu, Seoul, Korea, shindm@hongik.ac.kr Novel red phosphorescent iridium(III) complexes, (TP-MQ)Ir(tmd), (MTP-MQ)2Ir(tmd) were synthesized for red emitter of the phosphorescent organic light-emitting diodes (phOLEDs). The ligands have sites of both the electron donor and acceptor in a molecule. The main ligands consisted of (thiophene, 5-methylthiophene) and electron-acceptor methylquinoline were synthesized by suzuki coupling reaction. The iridium(III) complexes based on main ligands and 2,2,6,6-tetramethyl-3,5-heptanedione(tmd) ancillary ligand were synthesized by Nonoyama reaction. Their luminescence property was investigated by UV-visible spectroscopy and photoluminescence (PL) spectroscopy. The manufactured phOLEDs and WOLEDs were characterized by investigation of current density-voltage-luminance, power efficiency, external quantum efficiency, life time, electroluminescence spectrum. These phosphorescent iridium complexes will be promising candidates for highly efficient OLEDs.