Synthesis and Electroluminescent Characteristics of Red Phosphorescent Iridium(III) Complexes for Highly Efficient Organic Light-Emitting Diodes

초록

The new red phosphorescent iridium(III) complexes, (DMP-MDCPQ)(2)Ir(tmd), (MTP-MQ) 2Ir(tmd) were synthesized for highly efficient red organic light-emitting diodes (OLEDs). The main ligands consisted of electron-donor (3,5-dimethylphenyl), (5-methylthiophene) and electron-acceptor (4-methyl-7,8-dihydro-6H-cyclopenta[g]quinoline), 4-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 ligands were synthesized by Nonoyama reaction and measured by nuclear magnetic resonance (NMR). Also, their luminescence property was investigated by UV-visible spectroscopy and photoluminescence spectroscopy in dichloromethane (DCM) solvent. The manufactured OLEDs devices were characterized by investigation of current density-voltage-luminance, power efficiency, external quantum efficiency, EL spectrum. The iridium(III) complexes will be used as highly efficient dopants for the red OLEDs.

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