期刊
SCIENCE CHINA-CHEMISTRY
卷 62, 期 6, 页码 775-783出版社
SCIENCE PRESS
DOI: 10.1007/s11426-018-9434-6
关键词
organic light-emitting diode; electron transport material; electron mobility; pi-pi stacking; intermolecular interaction
资金
- National Key Research and Development Program of China [2017YFA0204501]
- National Natural Science Foundation of China [51525304, U1601651]
- National Basic Research Program of China [2015CB655002]
- Tsinghua University Initiative Scientific Research Program [20161080039, 20161080040]
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 - 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 3.60x10(-5) and 3.58x10(-5) cm(2) V-1 s(-1), respectively, at an electric field of 7x10(5) 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 - 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 - stacking, ETMs with even higher electron mobilities can thus be anticipated.
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