High Tg triphenylamine-based starburst hole-transporting material for organic light-emitting devices
High Tg triphenylamine-based starburst hole-transporting material for organic light-emitting devices
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DOI:
10.1021/cm0712624
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发表时间:
2007-11-27
影响因子:
8.6
通讯作者:
Lee, Shuit-Tong
中科院分区:
文献类型:
--
作者:
Tong, Qing-Xiao;Lai, Shiu-Lun;Lee, Shuit-Tong
This paper reports the synthesis of a new starburst molecule, 4,4',4"-tris[(2,3,4,5-tetraphenyl)phenyl]phenylamine (TTPPPA) and its application as a hole-transporting material in organic light-emitting devices (OLEDs). although TTPPPA has almost the same ionization potential as 1,4-bis(l-naphthylphenylamino)biphenyl (NPB), the TTPPPA-based device of ITO/TTPPPA/Alq(3)/LiF/Al yields much better efficiency of 5.3 cd/A and 4.3 lm/W than the standard ITO/NPB/Alq(3)/LiF/Al device (3.0 cd/A and 2.9 lm/W). The remarkable performance enhancement is attributed to a better balance of hole and electron injection in the TTPPPA-based device. Further, TTPPPA has a much higher glass-transition temperature (T-g, 202 degrees C) than NPB (T-g, 98 degrees C), suggesting that TTPPPA can be an alternative material to NPB especially for high-temperature applications of OLEDs and other organic electronic devices.