摘要
The effect of a benzimidazole derivative(TPBI)electron injection layer(EIL)on the performance of Alga based organic light-emitting devices(OLEDs)with a Cs_(2)C0_(3)/Al cathode is investigated.An increasing current density from 71.9mA/cm2 to 188.3mA/cm^(2),and an enhanced electroluminescence(EL)efficiency from 3.2cd/A to 3.64 cd/A at 9 V are found when a thin TPBI layer(5 nm)is inserted at the Alq_(3)/Cs_(2)C0_(3)interface.After further increasing the TPBI thickness to 10 run,OLEDs display a further increase in EL efficiency to 4.53cd/A.Our experiment suggests that the TPBI thin layer at the Alq_(3)/Cs_(2)C0_(3)interface facilitates the electron injection and is also involved with hole-blocking and exciton confinement.
作者
连加荣
牛芳芳
刘亚伟
曾鹏举
LIAN Jia-Bong;NIU Fang-Fang;LIU Ya-Wei;ZENG Peng-Ju(Key Laboratory of Optoelectronic Devices and Systems,Ministry of Education and Guangdong Province,Shenzhen University,Shenzhen 518060)
基金
Supported by the National Natural Science Foundation of China under Grant No 20972097
Guangdong-Provincial Natural Science Foundation(No 031805)
the Major Program in Key Field of Guangdong Province Government(No 2003-03)
Science and Technology Program of Shenzhen(No 2006-2007)
the Project 000011 Supported by SZU R/D Fund,Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province.
