摘要
4,7-Bisphenyl-1,10-phenanthroline(BPhen)is a promising electron transport material(ETM)and has been widely used in organic light-emitting diodes(OLEDs)because of the large electron mobility and easy fabrication process.However,its low glass transition temperature would lead to poor device stability.In the past decades,various attempts have been carried out to improve its thermal stability though always be accomplished by the reduced electron mobility.Here,we present a molecular engineering to modulate the properties of BPhen,and through which,a versatile BPhen derivative(4,7-bis(naphthaleneb-yl)-1,10-phenanthroline,b-BNPhen)with high thermal stability(glass transition temperature=111.9℃),large electron mobility(7.8×10-4 cm2/(V s)under an electrical field of 4.5×105 V/cm)and excellent n-doping ability with an air-stable metal of Ag is developed and used as multifunctional layers to improve the efficiency and enhance the stability of OLEDs.This work elucidates the great importance of our molecular engineering methodology and device structure optimization strategy,unlocking the potential of 1,10-phenanthroline derivatives towards practical applications.
4,7-二苯基-1,10-菲咯啉(BPhen)是一种常用的电子传输材料,凭借其电子迁移率高、制备工艺简单等优点,在有机电致发光二极管(OLED)中得到广泛的应用.然而,其较低的玻璃化转变温度(Tg)导致器件稳定性差,严重制约其进一步发展和应用.本文通过分子间氢键作用的调控,在菲咯啉衍生物中同时实现了高的热稳定性(Tg=111.9℃)和大的电子迁移率(7.8×10-4 cm2/(Vs)),并且可以活化惰性金属实现非常优异的n型掺杂性能,显著降低OLED器件驱动电压,提高OLED器件效率和改善OLED器件稳定性.
作者
Zhengyang Bin
Diyuan Shi
Rongchuan Su
Weiguo Han
Dongdong Zhang
Lian Duan
宾正杨;史棣元;苏蓉川;憨卫国;张东东;段炼(Key Laboratory of Organic Optoelectronics and Department of Chemistry,Tsinghua University,Beijing 100084,China;College of Chemistry,Sichuan University,Chengdu 610064,China;Center for Flexible Electronics Technology,Tsinghua University,Beijing 100084,China)
基金
supported by the National Key Basic Research and Development Program of China(2017YFA0204501,2016YFB0400702 and 2016YFB0401003)
the National Natural Science Foundation of China(51525304 and 61890942)
the Fundamental Research Funds for the Central Universities.
