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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Janus-Type Dendritic Organoiridium(III) Complex Bearing Hole- and Electron-Transporting Moieties: Synthesis, Luminescence Properties, and OLED Applications
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Janus-Type Dendritic Organoiridium(III) Complex Bearing Hole- and Electron-Transporting Moieties: Synthesis, Luminescence Properties, and OLED Applications

机译：Janus型树枝状有机铱（III）复合轴承孔和电子输送部分：合成，发光性能和OLED应用

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摘要

A novel tris-cyclometalated iridium(III) complex bearing carbazole-based hole-transporting and triarylphosphine oxide-based electron-transporting dendrons was synthesized through a convergent synthetic route, and its facial and meridional isomers were isolated by conventional silica gel chromatography. The facial isomer exhibited sky-blue photoluminescence (PL) from the phosphorescent core even in the neat film state with a relatively high PL quantum yield (Phi(PL)) of 0.57 because the dendrons efficiently suppress aggregate formation between the cores. The meridional isomer was less emissive (Phi(PL); 0.029 in deaerated dichloromethane) but photoisomerized to the facial isomer by UV light irradiation (365 nm) in spite of large steric hindrance between the bulky dendrons. A non-doped organic light-emitting diode (OLED) employing the facial isomer exhibited sky-blue electroluminescence with a higher maximum external quantum efficiency (EQE(max)) of 1.6% than that of a comparable device employing a reference complex bearing only hole-transporting dendrons (EQE(max); 0.5%). As lipophilic and apolar text-butyl groups are placed on the molecular surface, the present dendritic complex is soluble in cyclohexane and insoluble in ethanol. Utilizing this characteristic solubility, non-doped multilayer OLEDs consisting of a stack of hole-transporting layer/emitting layer (the dendritic complex)/electron-transporting layer were fabricated by solution processing. One of the multilayer devices exhibited an improved EQE(max) of 5.2%.
机译：通过收敛合成途径合成了一种新型三环级铱（III）基于咔唑基的咔唑基空穴传输和三芳基磷酸氧化物的电子传输树枝状物，通过常规硅胶色谱法分离其面部和子化异构体。面部异构体即使在具有0.57的相对高的PLUNTUM产率（PHI（PL））的整齐膜状态下也表现出来自磷光芯的天蓝色光致发光（PL），因为树枝状有效地抑制了核心之间的聚集体形成。优异的异构体较少发射（PHI（PL）; 0.029在脱气的二氯甲烷中）通过UV光照射（365nm）光学化，尽管庞大的树枝间之间的大空间障碍。采用面部异构体的非掺杂有机发光二极管（OLED）表现出具有1.6％的最大外部量子效率（EQE（MAX））的天蓝色电致发光比采用参考复合物轴承的可比装置的最大外部量子效率（EQE（MAX））。 - 波动的树突（EQE（MAX）; 0.5％）。随着亲脂性和脱色的文丁基置于分子表面上，本发明的树突式复合物可溶于环己烷和不溶于乙醇。利用该特征溶解度，通过溶液加工制造由一堆空穴传输层/发光层（树突式复合物）/电子传输层组成的非掺杂多层OLED。其中一个多层器件显示出改善的EQE（MAX）为5.2％。

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