γ-aza-SBF and δ-aza-SBF showed overlapped HOMO and LUMO orbitals. The aza-SBFs showed excellent bipolar features and good thermal stabilities than those of SBFs. The maximum current efficiencies (CE) of α-, β-, γ-, and δ-aza-SBF-based OLEDs were 28.8, 24.9, 25.5, and 27.2 cd/A, respectively. Compared to the SBF, all of four aza-SBFs showed better devices performances. The CE and power efficiency (PE) of OLED
合成了四个在一个
芴部分的不同位置带有氮原子的aza-9,9'-spirbibifluorenes(aza-SBFs),以研究其结构性质之间的关系。α-Aza-SBF和β-aza-SBF几乎完全分开了最高占据分子轨道(HOMO)和最低未占据分子轨道(LUMO),而γ-aza-SBF和δ-aza-SBF显示出HOMO和LUMO重叠轨道。氮杂-SBF比SBF表现出优异的双极性特性和良好的热稳定性。α-,β-,γ-和δ-aza-SBF的最大电流效率(CE)的OLED分别为28.8、24.9、25.5和27.2 cd / A。与SBF相比,所有四个aza-SBF均显示出更好的器件性能。基于α-氮杂-SBF的OLED的CE和功率效率(PE)为28.8 cd / A和22.6 lm / W,而基于SBF的OLED仅为12.3 cd / A和8.2 lm / W。基于氮-氮杂-SBF的OLED的最大外部量子效率为15