Investigation on two triphenylene based electron transport materials

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2019,（6）
• 页码范围: 775-783
• 页数: 9页
• 语种: 英文

摘要

Promoting electron mobility is the key to designing high performance electron transport materials (ETMs).Formation of intermolecular interaction can be helpful to enhance their electron mobilities as a result of more ordered molecular stacking.Here,to reveal the inherent influence of intermolecular π-π stacking on the electron mobilities,we designed two ETMs,namely,2,4-diphenyl-6-[3-(2-triphenylenyl)phenyl]-1,3,5-triazine (TPTRZ) and 2,4-diphenyl-6-[4'-(2-triphenylenyl)[1,1'-biphenyl]-3-yl]-1,3,5-triazine (TPPTRZ).Thermal,photophysical and electrochemical measurement results indicate they are good ETM candidates.Additionally,TPTRZ and TPPTRZ exhibit high electron mobilities of 3.60× 10-5 and 3.58× 10-5 cm2 V-1 s-1,respectively,at an electric field of 7× 105 V cm-1.By taking X-ray single crystal structure,theoretical calculation and time of flight (TOF) results into consideration,it is revealed that strong intermolecular π-π stacking induced by planar triphenylene and triphenyltriazine units renders TPTRZ and TPPTRZ small energetic and positional disorder parameters,and results in their high electron mobilities thereby.By further enhancing intermolecular π-π stacking,ETMs with even higher electron mobilities can thus be anticipated.