Add time:08/19/2019         Source:sciencedirect.com

Orange phosphorescent iridium(III) complexes, (DMBT)2Ir(acac) and (TBT)2Ir(acac), based on either 2-(3,4-dimethylphenyl)benzo[d]thiazole (DMBT) or 2-(4-(trimethylsilyl)phenyl)benzo[d]thiazole (TBT) as the cyclometalated main ligands and acetylacetone (acac) as an ancillary ligand, were synthesized for solution-processed organic light-emitting diodes (OLEDs). The Ir(III) complex, (BT)2Ir(acac), which consists of 2-phenylbenzo[d]thiazole (BT) as the main ligand and acac as the ancillary ligand, was also synthesized as a reference. The photophysical, electrochemical, and electroluminescent properties of these Ir(III) complexes were investigated. The OLED fabricated using (TBT)2Ir(acac) exhibited significantly improved luminance and external quantum efficiency (EQE) as self-quenching at high doping concentrations was successfully prevented by introducing bulky trimethylsilyl groups. The EL spectrum of (TBT)2Ir(acac) exhibited an emission maximum at 578 nm with a full-width-at-half-maximum of 74 nm and Commission Internationale de L'Eclairage coordinates of (0.55, 0.44) at 1000 cd/m2. The device with 7 wt% (TBT)2Ir(acac) dopant exhibited a maximum luminance of 6837 cd/m2, maximum luminous efficiency of 25.26 cd/A, power efficiency of 12.37 l m/W, and EQE of 9.94%.

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