Iridium(III) complexes with cyclometalated styrylbenzoimidazole ligands: Synthesis,electrochemistry and as highly efficient emitters for organic light-emitting diodes |
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| Authors: | Guanghui Zhang Fang-Iy Wu Xiaoqing Jiang Peipei Sun Chien-Hong Cheng |
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| Affiliation: | 1. Jiangsu Key Laboratory of Biofunctional Materials, College of Chemistry and Environmental Science, Nanjing Normal University, 122, Ninghai Road, Nanjing 210097, PR China;2. Department of Chemistry, Tsing Hua University, Hsinchu 30013, Taiwan |
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| Abstract: | Two phosphorescent iridium complexes (psbi)2Ir(acac) and (ppbi)2Ir(acac) (psbi = 1-phenyl-2-styryl-1H-benzod]imidazole, ppbi = 1-phenyl-2-(1-phenylprop-1-en-2-yl)-1H-benzod]imidazole, acac = acetylacetonate) were synthesized, and their photophysical, electrochemical and electroluminescent properties were also studied. Organic light-emitting devices with these two complexes as dopant emitters having the structure ITO/NPB (10 nm)/TCTA (20 nm)/x%Ir:CBP (y nm)/BCP (10 nm)/LiF (1 nm)/Al (100 nm) were fabricated. The device based on (psbi)2Ir(acac) exhibited a maximum brightness of 56,162 cd m?2, while the device based on (ppbi)2Ir(acac) gave a maximum brightness of 31,232 cd m?2. At high brightness of 1000 cd m?2 and 10,000 cd m?2, high current efficiencies of 25.7 cd A?1 and 20.7 cd A?1 were achieved, respectively, for the (psbi)2Ir(acac)-based EL device. For the EL device based on (ppbi)2Ir(acac), current efficiencies of 20.1 cd A?1 at 1000 cd m?2 and 14.2 cd A?1 at 10,000 cd m?2 were observed. |
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