Highly Phosphorescent Bis-Cyclometalated Iridium Complexes Containing Benzoimidazole-Based Ligands

✍ Scribed by Huang, Wei-Sheng; Lin, Jiann T.; Chien, Chin-Hsing; Tao, Yu-Tai; Sun, Shih-Sheng; Wen, Yuh-Sheng

• Book ID: 123611468
• Publisher: American Chemical Society
• Year: 2004
• Tongue: English
• Weight: 240 KB
• Volume: 16
• Category: Article
• ISSN: 0897-4756
• DOI: 10.1021/cm0498943

✦ Synopsis

New benzoimidazoles (bi) have been synthesized. These compounds readily undergo cyclometalation with iridium trichloride, and bis-cyclometalated iridium complexes, (bi) 2 Ir-(acac) (bi ) cyclometalated benzoimidazole; acac ) acetylacetonate), can be isolated. One of the complexes, (fbi) 2 Ir(acac) (fbi ) 2-(9,9-diethyl-9H-fluoren-2-yl-1H-benzoimidazole), was also characterized by single-crystal X-ray structural determination. Some of the complexes, (bi) 2 Ir(acac), are highly phosphorescent at ambient condition. Light-emitting devices using these complexes as dopants were fabricated, and the emission colors range from green to red. Some green-and yellow-emitting devices exhibit very high efficiencies.