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Sky-blue-emitting cationic iridium complexes with oxadiazole/triazine-type counter-anions and their use for efficient solution-processed organic light-emitting diodes
Dyes and Pigments ( IF 4.5 ) Pub Date : 2020-05-29 , DOI: 10.1016/j.dyepig.2020.108586
Rubing Bai , Pei Wang , Xianwen Meng , Lei He

Counter-anion control has emerged as a facile approach to tune the properties of cationic iridium complexes for optoelectronic applications. Here we report sky-blue-emitting cationic iridium complexes with electron-deficient oxadiazole/triazine-type counter-anions and their use for highly efficient solution-processed organic light-emitting diodes (OLEDs). A sky-blue-emitting complex [Ir(meoppy)2(dmapzpy)]+ (meoppy is 4-methoxy-2-phenylpyridine and dmapzpy is 4-dimethylamino-2-(1H-pyrazol-1-yl)pyridine) has been developed as the phosphorescent cation. Hexafluorophosphate (PF6), 3,5-bis(5-(4-(tert-butyl)phenyl)-1,3,4-oxadiazol-2-yl)benzenesulfonate (OXD-7-SO3), 4-(4,6-diphenyl-1,3,5-triazin-2-yl)benzenesulfonate (TRZ-p-SO3) and 3-(4,6-diphenyl-1,3,5-triazin-2-yl)benzenesulfonate (TRZ-m-SO3) have been developed as the counter-anions in complexes R, 1, 2 and 3, respectively. In doped films, the complexes afford similar sky-blue emission peaked at around 472 nm with high phosphorescent efficiencies of around 0.80. Solution-processed, double-layer OLEDs using the complexes as dopants afford sky-blue electroluminescence peaked at around 476 nm. The devices using complexes 1–3 show largely enhanced performances compared to the device using the reference complex R, owing to the improved carrier-recombination balance imparted by the electron-trapping effects of the oxadiazole/triazine type counter-anions. The devices based on complexes 2 and 3 exhibit higher performances than that based on complex 1, because of the stronger electron-trapping effects of TRZ-p-SO3 and TRZ-m-SO3 compared to OXD-7-SO3. The double-layer device using complex 3 shows a peak current efficiency of 29.4 cd A−1 and an external quantum efficiency of 12.4%, which are the highest for blue OLEDs using cationic iridium complexes reported so far.



中文翻译:

带有天二唑/三嗪型抗衡阴离子的天蓝色发射阳离子铱络合物及其在高效溶液处理的有机发光二极管中的用途

抗衡阴离子控制已成为一种为光电应用调节阳离子铱配合物性能的简便方法。在这里,我们报告与电子不足的恶二唑/三嗪型抗衡阴离子一起发射出天蓝色的阳离子铱络合物,并将其用于高效溶液加工的有机发光二极管(OLED)。天蓝色发光络合物[Ir(meoppy)2(dmapzpy)] +(oppy是4-甲氧基-2-苯基吡啶,dmapzpy是4-二甲基氨基-2-(1 H-吡唑-1-基)吡啶)被开发为磷光阳离子。六氟磷酸盐(PF 6 - ),3,5-二(5-(4-(丁基)苯基)-1,3,4-恶二唑-2-基)苯(OXD-7-SO 3 -),4-(4,6-二苯基-1,3,5-三嗪-2-基)苯磺酸钠(TRZ-P-SO 3 - )和3-(4,6-二苯基-1,3,5-三嗪吡啶-2-基)苯磺酸盐(TRZ-M-SO 3 -)已分别开发为配合物R,1、2和3中的抗衡阴离子。在掺杂的薄膜中,复合物提供类似的天蓝色发射峰,其峰值约为472 nm,磷光效率约为0.80。使用络合物作为掺杂剂进行溶液处理的双层OLED,可提供在约476 nm处达到峰值的天蓝色电致发光。与使用参考配合物R的设备相比,使用配合物1-3的设备表现出大大增强的性能,这是由于恶​​二唑/三嗪型抗衡阴离子的电子俘获作用所赋予的改善的载流子重组平衡。因为TRZ-P-SO的强电子俘获效应根据基于复杂1络合物2和3显示出更高的性能比的装置中,3 - TRZ-M-SO和3-相比OXD-7-SO 3 -。使用配合物3的双层器件显示出29.4 cd A -1的峰值电流效率和12.4%的外部量子效率,这是迄今为止报道的使用阳离子铱配合物的蓝色OLED的最高值。

更新日期:2020-05-29
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