Rational Design, Synthesis, and Characterization of Deep Blue Phosphorescent Ir(III) Complexes Containing (4鈥?Substituted-2鈥?pyridyl)-1,2,4-triazole Ancillary Ligands

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• 作者：Hea Jung Park ; Ji Na Kim ; Hyun-Ji Yoo ; Kyung-Ryang Wee ; Sang Ook Kang ; Dae Won Cho ; Ung Chan Yoon
• 刊名：The Journal of Organic Chemistry
• 出版年：2013
• 出版时间：August 16, 2013
• 年：2013
• 卷：78
• 期：16
• 页码：8054-8064
• 全文大小：645K
• 年卷期：v.78,no.16(August 16, 2013)
• ISSN：1520-6904

文摘

On the basis of the results of frontier orbital considerations, 4-substituted-2鈥?pyridyltriazoles were designed to serve as ancillary ligands in 2-phenylpyridine main ligand containing heteroleptic iridium(III) complexes that display deep blue phosphorescence emission. The iridium(III) complexes, Ir1鈥?b>Ir7, prepared using the new ancillary ligands, were found to display structured, highly quantum efficient (桅_p = 0.20鈥?.42) phosphorescence with emission maxima in the blue to deep blue 448鈥?56 nm at room temperature. In accord with predictions based on frontier orbital considerations, the complexes were observed to have emission properties that are dependent on the electronic nature of substituents at the C-4 position of the pyridine moiety of the ancillary ligand. Importantly, placement of an electron-donating methyl group at C-4鈥?of the pyridine ring of the 5-(pyridine-2鈥?yl)-3-trifluoromethyl-1,2,4-triazole ancillary ligand leads to an iridium(III) complex that displays a deep blue phosphorescence emission maximum at 448 nm in both the liquid and film states at room temperature. Finally, an OLED device, constructed using an Ir-complex containing the optimized ancillary ligand as the dopant, was found to emit deep blue color with a CIE of 0.15, 0.18, which is close to the perfect goal of 0.15, 0.15.