期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 4, 期 23, 页码 5241-5247出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc01383j
关键词
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资金
- National Natural Science Foundation of China [51273053]
- National Basic Research Program of China (973 Program) [2015CB655004, 2013CB834702]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2014A030306035]
- Guangdong Innovative Research Team Programof China [201101C0105067115]
- Science and Technology Project of Guangdong Province [2016B090907001]
- Fundamental Research Funds for the Central Universities [2015PT020, 2015ZY013]
- [ITC-CNERC14S01]
Organic electroluminescent materials that can simultaneously serve as light-emitting and electron-transporting layers in one organic light-emitting diode (OLED) are very useful for simplifying device configuration, but there are not many. In this work, three tailored luminescent materials (TPE-DB, TPE-BPDB and TPE-TPDB) adopting tetraphenylethene (TPE) and dimesitylboryl groups as the p-conjugated backbone and the electron-deficient functional group, respectively, are synthesized and fully characterized. Their thermal, photophysical, electronic, electrochemical, and electroluminescent properties are investigated systematically. The results reveal that these new dimesitylboryl-functionalized TPE derivatives feature aggregation-induced emission (AIE) characteristics with high fluorescence quantum yields of 81-86% in solid films. They possess high glass-transition temperatures of 134-168 degrees C and very low LUMO energy levels down to -2.9 eV. The OLED device [ITO/HATCN (20 nm)/NPB (40 nm)/TPE-DB (60 nm)/LiF (1 nm)/Al (100 nm)] that is fabricated by adopting TPE-DB as both the light emitter and electron transporter exhibits excellent electroluminescent performance, with high efficiencies of up to 13.5 cd A(-1) and 4.6%, which are advanced noticeably relative to those attained from the device with an additional electron-transporting layer (TPBi). The results demonstrate that these new TPE derivatives are promising n-type solid-state luminescent materials with practical utility in nondoped OLEDs.
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