High-Power-Efficiency Blue Electrophosphorescence Enabled by the Synergistic Combination of Phosphine-Oxide-Based Host and Electron-Transporting Materials
作者:Shaolong Gong、Yi-Lu Chang、Kailong Wu、Robin White、Zheng-Hong Lu、Datong Song、Chuluo Yang
DOI:10.1021/cm4037555
日期:2014.2.11
cd m–2, respectively, and the highest power efficiency (up to 45.3 lm W–1) to date for iridium(III) bis(4′,6′-difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate (FIr6)-based blue PhOLEDs, which is significantly higher than those of the FIr6-based PhOLEDs with n-doped electron-transporting layer or p-i-n structure. These results suggest that the high-power-efficiency blue PhOLEDs can be achieved by
通过整合供电子的4,4'-二甲基二苯胺单元和电子接受的二苯基氧化膦基团成环己烷骨架。该设计策略使主体材料具有2.93 eV的高三重态能量,−5.24 eV的浅HOMO能级和双极电荷传输功能。另外,一种新的电子传输(ET)材料1,3,5-三[3-(二苯基磷酰基)苯基]苯(TP3PO),具有2.78 eV的高三重态,-6.40 eV的深HOMO能级通过三个二苯基膦氧化物基团和三苯基苯骨架的适当组合,可以构建具有良好的ET能力的化合物。这些功能使这些基于氧化膦的功能材料非常适合蓝色磷光有机发光二极管(PhOLED)。通过使用这些功能材料,蓝色设备在1,cd和1000 cd m的亮度下表现出2.6、3.6和5.4 V的低驱动电压基于铱(III)双(4',6'-二氟苯基吡啶并氨基)四(1-吡唑基)硼酸酯(FIr6)的蓝色PhOLED分别具有–2和迄今为止最高的功率效率(高达45.3 lm W –1)