Hybrid Heterocycle-Containing Electron-Transport Materials Synthesized by Regioselective Suzuki Cross-Coupling Reactions for Highly Efficient Phosphorescent OLEDs with Unprecedented Low Operating Voltage
作者:Ming Liu、Shi-Jian Su、Min-Cherl Jung、Yabing Qi、Wei-Ming Zhao、Junji Kido
DOI:10.1021/cm303075m
日期:2012.10.23
A series of hybrid heterocyle-containing electron-transport materials (ETMs) with different pyridine substitution positions in a single molecule were successfully synthesized by regioselective sequential palladium-catalyzed Suzuki cross-coupling reactions. B3LYP calculations show that the experimental regioselectivity is consistent with the trends in calculated bond dissociation energies of the carbon–halogen
通过区域选择性顺序钯催化的Suzuki交叉偶联反应成功合成了一系列在单个分子中具有不同吡啶取代位置的杂化含杂环电子传输材料(ETM)。B3LYP计算表明,实验区域选择性与反应物和中间体的碳-卤素(C-X)键的计算键解离能的趋势一致。可以通过X射线光电子能谱检测与C–N和C–C相关的两种碳。电致发光的2.1 V的极低开启电压(V on),比发射的光子能量(hv)/ e的最小值低0.2-0.3 V通过使用开发的ETM作为经典的基于fac -tris(2-苯基吡啶)铱(Ir(PPy)3)的绿色磷光有机发光器件的电子传输和空穴/激子阻挡层来实现实验OLED)。此外,迄今为止,获得了100、1000和10000 cd m –2的最低工作电压2.39、2.72和3.88 V ,同时改善了外部量子效率(ηext),从而提供了高功率效率,并且工作100 cd m –2的电压已经对应于hv / e的值。原子