Two Green-Phosphorescent Iridium Complexes with 2-Phenylpyrimidine Derivatives and Tetraphenylimidodiphosphinate for Efficient Organic Light-Emitting Diodes

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• 作者：Song Zhang ; Jing-Cheng Xia ; Zheng-Guang Wu ; Guang-Zhao Lu ; Yue Zhao and You-Xuan Zheng
• 刊名：European Journal of Inorganic Chemistry
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：2016
• 期：15-16
• 页码：2556-2561
• 全文大小：1353K
• ISSN：1099-0682c

文摘

Two phosphorescent Ir^III complexes Ir1 and Ir2 containing 5-fluoro-2-[4-(trifluoromethyl)phenyl]pyrimidine and 2-(3,4-difluorophenyl)-5-fluoropyrimidine as cyclometalated main ligand and tetraphenylimidodiphosphinate as ancillary ligand were synthesized. Ir1 was characterized by single-crystal X-ray crystallography. Ir1 and Ir2 show green emissions peaking at 527 and 513 nm, respectively. By using the two complexes as emitters, organic light-emitting diodes (OLEDs) with the structure of TAPC (1,1-bis[4-(di-p-tolylamino)phenyl]cyclohexane, 40 nm)/Ir1 or Ir2 (10 wt.-%):mCP (1,3-bis(9H-carbazol-9-yl)benzene, 20 nm)/TmPyPB (1,3,5-tris(m-pyrid-3-ylphenyl)benzene, 30 nm)/LiF (1 nm)/Al (100 nm) showed high performance with maximum current efficiencies as high as 81.91 or 71.17 cd A^–1 and maximum external quantum efficiencies of 20.8 or 21.3 %, respectively. The low-efficiency roll-off ratios of the two devices suggest that the two complexes have potential applications in OLEDs.