Improved Hole-Blocking and Electron Injection Using a TPBI Interlayer at the Cathode Interface of OLEDs  

作　　者：LIAN Jia-Bong NIU Fang-Fang LIU Ya-Wei ZENG Peng-Ju 连加荣;牛芳芳;刘亚伟;曾鹏举(Key Laboratory of Optoelectronic Devices and Systems,Ministry of Education and Guangdong Province,Shenzhen University,Shenzhen 518060)

机构地区：[1]Key Laboratory of Optoelectronic Devices and Systems,Ministry of Education and Guangdong Province,Shenzhen University,Shenzhen 518060

出　　处：《Chinese Physics Letters》2011年第4期213-215,共3页中国物理快报（英文版）

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.

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.

关 键 词：OLEDS Electron INJECTION 

分 类 号：TN3[电子电信—物理电子学]