Development of novel red phosphorescent iridium complex with phenyl-isoquinoline ligand for organic electroluminescent device

Novel red phosphorescent compound (IR-PIQC-1), iridium complex with two phenyl-isoquinoline ligands and one 2-acetyl-1,3-cyclohexanedione ligand was designed and synthesized. The electroluminescent (EL) characteristics of IR-PIQC-1 in the EL device were evaluated. The thin layers of EL devices were fabricated by the vacuum deposition method, and the layer-structures of the devices were ITO/NPD/IR-PIQC-1 or IR-BTPAC (10%) in CBP/Balq/Alq/LiF/Al. Brightness of the IR-PIQC-1 device was 574cd/m2 at 11mA/cm2, and the external quantum efficiency was estimated as 5.28% at the same current density. The EL spectrum of the IR-PIQC-1 device was detected at about 620nm as the maximum peak with red phosphorescence.