·研究论文· 以 3-乙酰基樟脑作为辅助配体的环金属铱配合物的合成及光电性能 研究 贾 娟 骆开均* 陈艳芳 赵白静 李茂伟 (四川师范大学化学与材料科学学院 成都 610068) 摘要 以立体位阻 3-乙酰基樟脑为辅助配体合成了系列新型的环金属铱配合物 3-乙酰基樟脑-2-(2,4-二氟)苯基吡啶环 金属铱配合物[(46dfppy) 2 Ir(acam)], 3-乙酰基樟脑-2-苯基吡啶环金属铱配合物[(ppy) 2 Ir(acam)], 3-乙酰基樟脑-2-苯并噻 吩吡啶环金属铱配合物[(btp) 2 Ir(acam)]. 将配合物的吸收光谱、光致发光光谱以及光致发光效率与辅助配体为乙酰丙酮 (acac)的对应配合物进行了比较, 发现在配合物中引入具有大空间位阻的 3-乙酰基樟脑使配合物的光致发光效率均有 所提高. 并将(ppy) 2 Ir(acam)用于有机电致发光器件, 电致发光光谱在 516 nm 处有一最大强度峰, 驱动电压为 12 V 时最 大亮度为 10930 cd/m 2 , 最大亮度效率达到 14.6 cd/A, 电压为 10.7 V 时最大功率为 4.23

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... W, 亮度为 698 cd/m 2 . Abstract A series of bis-cyclometalated iridium complexes, iridium(III) bis(2-(2,4-difluoro)phenylpyridine-N,C2') 3-acetyl camphor [(46dfppy) 2 Ir(acam)], iridium(III) bis(2-phenylpyridinato-N,C2') 3-acetyl camphor [(ppy) 2 Ir(acam)] and iridium(III) bis(2-(2'-benzothienyl) pyridinato-N,C3') 3-acetyl camphor [(btp) 2 Ir(acam)] were synthesized with sterically 3-acetyl camphor as ancillary ligand. The absorption spectrum, PL spectra and photoluminescence efficiency of complexes were compared with the corresponding complexes with acetylacetone (acac) as the ancillary ligand. It was found that all of their photoluminescence efficiency could be improved when sterically hindered 3-acetyl camphor was introduced. When [(ppy) 2 Ir(acam)] was used as light-emitting devices, the EL spectra has the largest peak intensity at 516 nm. The device has the greatest brightness of 10930 cd/m 2 and maximum brightness efficiency of 14.6 cd/A at 12 V. The highest power effciency and brightness are 4.23 lm/W and 698 cd/m 2 respectively at 10.7 V. Keywords bis-cyclometalated iridium complexes; 3-acetyl camphor; quantum efficiency 由于以 2-苯基吡啶等为主配体, 乙酰丙酮为辅助配 体的环金属铂、铱配合物电磷光材料能够同时利用单线 态和三线态激子, 理论上内量子效率可以达到 100%, 近年来一直受到广泛的重视. 一般认为, 在磷光材料构 造的有机发光器件中, 主体材料与客体分子的能量传递 是通过 Dexter 能量传递方式实现的. Dexter 能量传递属 于短程传递, 与客体分子在主体中的浓度有关, 所以需 要磷光分子在主体中有较高的浓度. 而在如此高的客体 No. 8 贾 娟等:以 3-乙酰基樟脑作为辅助配体的环金属铱配合物的合成及光电性能研究