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Electroluminescence of iridium(III) complexes containing F or CF3 substituents
Synthetic Metals ( IF 4.4 ) Pub Date : 2020-12-23 , DOI: 10.1016/j.synthmet.2020.116673
Sohrab Nasiri , Manojkumar Dhanthala Thiyagarajan , Umamahesh Balijapalli , Malek Mahmoudi , Dmytro Volyniuk , Jurate Simokaitiene , Madhvesh Pathak , Sathiyanarayanan Kulathu Iyer , Juozas Vidas Grazulevicius

Electron withdrawing groups F or CF3 were attached to 6-methyl-4-diphenylquinoline (medpq) ligand. The effect of this substitution on photophysical and electroluminescent properties of four phosphorescent iridium(III) complexes containing the two upgraded medpq ligands and 2-(2-pyridyl) benzimidazole or 2-(1H-tetrazol-5-yl) pyridine ligand was comparatively investigated. All complexes emitted strong phosphorescence with absolute quantum efficiency of deoxygenated toluene solutions higher than 50% and the lifetime of 1.068–1.88 microseconds observed for neat films at 77 K. The orange phosphorescence of CF3-substituted complexes was slight shifted to higher energy region in comparison to that of the corresponding F-containing complexes. The ionization potentials detected by photoelectron emission spectroscopy for solid-state samples of the complexes were practically the same (5.91–6.04 eV). Exploiting the same device structure, phosphorescent organic light-emitting diodes (PhOLEDs) containing a CF3-substituted complex exhibited maximum external quantum efficiency of 10.33% in contrast to 5.36% observed for PhOLEDs based on a F-containing complex.



中文翻译:

含F或CF 3取代基的铱(III)配合物的电致发光

吸电子基团F或CF 3连接至6-甲基-4-二苯基喹啉(medpq)配体。比较研究了这种取代对四种含两种升级的medpq配体和2-(2-吡啶基)苯并咪唑或2-(1H-四唑-5-基)吡啶配体的磷化铱(III)配合物的光物理和电致发光性能的影响。 。所有配合物均发出强烈的磷光,脱氧甲苯溶液的绝对量子效率高于50%,在77 K的纯净膜上观察到的寿命为1.068–1.88微秒。CF 3的橙色磷光与相应的含F配合物相比,被取代的配合物略微转移到较高的能量区域。通过光电子发射光谱法检测到的复合物固态样品的电离电势实际上是相同的(5.91-6.04 eV)。利用相同的器件结构,包含CF 3取代的配合物的磷光有机发光二极管(PhOLED)表现出的最大外部量子效率为10.33%,而基于含F的配合物的PhOLED观察到的为5.36%。

更新日期:2020-12-23
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