| 基于不同辅助配体的氟代二苯基苯并咪唑铱配合物的合成及溶液加工型电致发光器件 | |
| Synthesis of Fluorinated Diphenylbenzimidazole Iridium Complexes Based on Different Auxiliary Ligands and Solution-Processed Electroluminescent Devices | |
| 摘要: 以氟代二苯基苯并咪唑为主配体，结合不同的辅助配体乙酰丙酮(对应配合物 Ir-1a~Ir-3a)、2-吡啶甲酸(对应配合物Ir-1b~Ir-3b)和2-(5-三氟甲基-2H-[1，2，4]三唑-3-基)-吡啶(tftp，对应配合物Ir-1c~Ir-3c)，设计并合成了9个新颖的苯并咪唑铱(Ⅲ)配合物Ir-1a~Ir-3c。考察了氟化度、不同辅助配体对相应铱配合物的光物理性能的影响规律。9个配合物的最大发射波长位于487~502 nm范围内，呈现出绿光到蓝绿光的磷光发射。其中基于tftp辅助配体的配合物蓝移的幅度最大，特别是Ir-1c相比于Ir-1a蓝移了17 nm。选取其中4个铱配合物Ir-1c、Ir-2c、Ir-3c和Ir-2b，以9%的掺杂浓度制备了旋涂发光器件，结果表明铱配合物主配体和辅助配体的改变对器件的发光颜色和发光效率产生了较大的影响。基于Ir-3c掺杂的旋涂器件具有最高的器件效率，外量子效率为10.2%，电流效率可达30.3 cd·A-1，最大功率效率为14.7 lm·W-1。 | |
| 关键词: 苯并咪唑 铱配合物 氟化学 辅助配体 溶液旋涂 | |
| 基金项目: 辽宁省自然科学基金(No.2020-MS-282)资助 | |
| Abstract: Nine benzimidazole-iridium(Ⅲ) complexes Ir-1a-Ir-3c were designed and synthesized by using fluorinated diphenylbenzimidazole derivatives as the main ligands and acetylacetone (corresponding complexes: Ir-1a-Ir-3a), 2-pyridine carboxylic acid (corresponding complexes: Ir-1b-Ir-3b), and 2-(5-trifluoromethyl-2H-[1,2,4]triazol-3-yl)-pyridine (tftp, corresponding complexes: Ir-1c-Ir-3c) as the auxiliary ligands, respectively. The effects of the degree of fluorination and different auxiliary ligands on the photophysical properties of the corresponding iridium complexes were investigated. The maximum emission wavelengths of the nine complexes were located in a range of 487-502 nm, showing green to blue-green phosphorescent emission. The largest blue shift was observed for the complexes based on tftp as an auxiliary ligand, especially for Ir-1c compared to Ir-1a with a blue shift of 17 nm. The nine complexes showed excellent photoluminescence efficiencies of 52%-87%. Furthermore, all iridium(Ⅲ) complexes exhibited good thermal stability, and the thermal decomposition temperatures were 313-390 ℃ (5% weight loss). Four iridium complexes of Ir-1c, Ir-2c, Ir-3c, and Ir-2b were selected for spin-coated electroluminescent devices with a doping concentration of 9%. The results show that the change of the primary and secondary ligands has a large effect on the luminescent color and luminescent efficiency of the light-emitting diodes. The Ir-3c-doped spin-coated devices had the highest device efficiency with an external quantum efficiency of 10.2%, a current efficiency of up to 30.3 cd·A-1, and a maximum power efficiency of 14.7 lm·W-1. | |
| Keywords: benzimidazole iridium complexes fluorine chemistry auxiliary ligands solution spin-coating | |
| 投稿时间：2021-09-13 修订日期：2021-11-30 | |
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| 廖浩森,甘君仪,夏昕,胡永旭,谢冬冬,张东煜,李晓.基于不同辅助配体的氟代二苯基苯并咪唑铱配合物的合成及溶液加工型电致发光器件[J].无机化学学报,2022,38(3):399-406. | |
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