| 초록 |
A new series of highly efficient phosphorescent Ir(III) complexes, which have potential applications to solution processable phosphorescent organic light-emitting diodes (PhOLEDs), were synthesized and their photophysical, electrochemical, and electroluminescent (EL) properties were investigated. The Ir(III) complexes, including (Et-CVz-Tz)2Ir(pic), (Et-CVz-Tz)2Ir(pic-N-O), (Et-CVz-Tz)2Ir(EO2-pic), and (Et-CVz-Tz)2Ir(EO2-pic-N-O), are comprised of a linked N-ethylcarbazole (Et-CVz) and thiazole (Tz) units as the main ligand (Et-CVz-Tz) and picolinic acid (pic) and picolinic acid N-oxide (pic-N-O) as ancillary ligands. In addition, some of the Ir(III) complexes contain an ethylene oxide solubilizing group attached to the ancillary ligands via tandem reaction. High performance, solution processable PhOLEDs, fabricated using the (Et-CVz-Tz)2Ir(EO2-pic), were observed to have a maximum external quantum efficiency of 6.08% and luminance efficiency of 10.98 cd/A. |
