We report a molecular engineering study on optical, structural and electrical properties of seven silole derivates aimed at enhancing the charge carrier balance in single-layer devices. By functionalizing two hole-transporting groups, dipyridylamine and anthracene, on the silole ring, we have investigated the influence of both substituents on the hole current. We have concluded that in contrast to dipyridylamine groups, anthracene groups decrease the charge carrier balance since the latter groups not only increase the hole current but also electron contribution. Mixing these hole-transporting groups and doubling their number lead to a novel silole becoming a very efficient emissive layer exhibiting threshold voltage below 3 V and luminous efficiency Le = 0.8 cd A−1 at 7 V.
我们报告了对七种
硅烯衍
生物的光学、结构和电学特性进行的分子工程研究,旨在提高单层器件中的电荷载流子平衡。通过在
硅ole 环上官能化两个空穴传输基团--二
吡啶基胺和
蒽,我们研究了这两个取代基对空穴电流的影响。我们得出的结论是,与二
吡啶基胺基团相反,
蒽基团会降低电荷载流子平衡,因为后者不仅会增加空穴电流,还会增加电子贡献。混合这些空穴传输基团并将其数量增加一倍,可使新型
硅烯成为一种非常高效的发光层,其阈值电压低于 3 V,在 7 V 时发光效率 Le = 0.8 cd A-1。