Four aza-9,9′-spirobifluorenes (aza-SBFs) with nitrogen atom at different positions of one fluorene moiety were synthesized to study the structure-properties relationships. α-Aza-SBF and β-aza-SBF possessed almost completely separated the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO), while 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 based on α-aza-SBF was 28.8 cd/A and 22.6 lm/W, while the SBF-based OLED was only 12.3 cd/A and 8.2 lm/W. The maximum external quantum efficiency of α-aza-SBF-based OLED was 15.4%, which was 2.5 times than that of the SBF-based one (6.6%) due to introduction of nitrogen improving electron transporting. Novel materials based on these components and their potential applications in organic electronics were expected due to their excellent bipolar features.

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15.4％，是基于SBF的OLED的最大外部量子效率（6.6％）的2.5倍，这是由于引入了氮改善了电子传输。由于其优异的双极特性，人们期望基于这些组件的新型材料及其在有机电子领域的潜在应用。