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To construct efficient emitters suitable for non-doped devices and deeply understand the relationship between structures and performances, we designed and synthesized two heteroleptic iridium(III) complexes based on 1,2-diphenyl-1H-benzoimidazole (PBI) ligands whose substituents are varied simply from methyl (complex 2) to tert-butyl groups (complex 3). The parent complex 1 with non-substituent on...
Four novel iridium(III) complexes containing 1,2-diphenyl-1H-benzoimidazole as cyclometalated ligands were successfully synthesized and characterized. The complexes displayed strong emissions around 492 nm with high photoluminescence quantum yields of 70–92% in dichloromethane solution at 298 K. Doped OLEDs based on the complexes were prepared, which showed a peak current efficiency of 34.5 cd A ...
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