Synthesis, characterization and electroluminescence properties of iridium complexes based on pyridazine and phthalazine derivatives with C^NN structure

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• 作者：Yuan Fang ; Yanhu Li ; Shuanjin Wang ; Yuezhong Meng ; Junbiao Peng ; Biao Wang
• 关键词：Organic light-emitting diodes ; Iridium complex ; Phosphorescence ; Pyridazine derivative ; Phthalazine derivative
• 刊名：Synthetic Metals
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：160
• 期：21-22
• 页码：2231-2238
• 全文大小：565 K

文摘

We reported the synthesis and characterization of three novel tris-cyclometalated iridium(III) complexes with pyridazine and phthalazine derivatives as ligands bearing C^NN structure, namely, Ir(PYA)₃, Ir(PHB)₃, and Ir(PHC)₃. Reactions of the ligands with IrCl₃·3H₂O directly afforded tris-cyclometalated iridium(III) complexes in 31–39 % yields. X-ray analysis revealed that the complexes exhibited the facial configuration, and the Ir–C bond lengths of the complexes are 2.009(3), 2.013(3), 2.019(3) Å for Ir(PYA)₃, and 1.993(4), 2.002(4), 2.004(4) Å for Ir(PHB)₃, respectively. The iridium complexes-based OLEDs fabricated by spin-coating technique exhibited promising performance. At 4 wt % doping level and a practical luminance of 100 cd m⁻², the external quantum efficiencies of the devices using Ir(PYA)₃, Ir(PHB)₃ and Ir(PHC)₃ as dopants reached 9.0, 6.9 and 9.3 % photons/electron, respectively.