Synthesis and device properties of azeticyclic phenylpyridine iridium complexes
By introducing phenylpyridine to modify 2-methylbenzofuran[2,3-b]pyridine-8-boronate(Ⅱ)and partially deuterizing the auxiliary ligand while fully deuterizing two methyl groups of 5-methyl-2-p-tolylpyridine main ligand,two iridium complexes,bis[5-methyl-2-(4-methylphenyl)pyridyl-N,C2]{2-[7-(6-phenylpyridin-2-yl)dibenzofuran-4-yl]-4-phenylpyridine}iridium(Ⅳ)and bis{5-(methyl-d3)-2-[4-(methyl-d3)phenyl]pyridyl-N,C2}[2-{7-[6-(methyl-d3)pyridin-2-yl]dibenzofuran-4-yl}-4-(phenyl-d5)pyriridine]iridium(Ⅳ-d20),were synthesized,with the structures characterized and confirmed by 1HNMR,HRMS,and elemental analyzer.The photophysical properties and energy level structure were then characterized by UV-Vis spectroscopy,fluorescence emission spectroscopy(PL)and cyclic voltammetry.Devices were constructed with iridium complexes Ⅳ and Ⅳ-d20 as guests,and their performance was evaluated.The results showed that iridium complexes Ⅳ and Ⅳ-d20 displayed photoluminescence spectral emission wavelengths of 546.9 and 548.0 nm,respectively,indicating potential yellow-green phosphorescent materials.Iridium complexes Ⅳ-d20 exhibited better device performance under electroluminescence.The device constructed with iridium complex Ⅳ-d20 showed an emission wavelength of 552 nm,color coordinate of(0.43,0.56),maximum current efficiency of 97.49 cd/A,and maximum external quantum efficiency of 26.83%.
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