Perylene Bisimide-Based Donor–Acceptor Materials Incorporating Oligothiophenes: Synthesis, Characterization, Thin-Film Properties, and Nanomorphology
作者:Kazuhiro Nakabayashi、Yuhei Takeuchi、Hideharu Mori
DOI:10.1246/bcsj.20160178
日期:2016.9.15
We developed a series of perylene bisimide (PBI)-based small molecules with donor–acceptor (D–A) architecture (PBI1, PBI2, and PBI3). By tuning the D–A architecture, intramolecular charge transfer (ICT) could be controlled; as a result, optical band gaps and HOMO levels of PBI1–3 were widely tunable from 1.83 to 1.44 eV and from −5.85 to −5.55 eV, respectively. Furthermore, extremely wide light absorption over 900 nm was observed in the thermal annealed PBI1–3 blend film. The grazing incidence wide angle X-ray scattering (GIWAXS) analysis demonstrated that the as-spun PBI2 thin film had the highest ordered nanostructure among PBI1–3, in which diffraction corresponding to π–π stacking was clearly observed in isotropic orientations.
我们开发了一系列以苝二酰亚胺(PBI)为基础的小分子,具有供体-受体(D–A)结构(PBI1、PBI2和PBI3)。通过调节D–A结构,可以控制分子内电荷转移(ICT);结果,PBI1–3的光学带隙和HOMO能级分别在1.83到1.44 eV以及-5.85到-5.55 eV之间广泛可调。此外,在热退火的PBI1–3混合薄膜中观察到了超过900 nm的极宽光吸收。斜入射宽角X射线散射(GIWAXS)分析表明,作为旋涂薄膜的PBI2在PBI1–3中具有最高的有序纳米结构,明显观察到与π–π堆叠对应的衍射,并且其方向具有各向同性。