Efficiency of a blue organic light-emitting diode enhanced by inserting charge control layers into the emission region  

作　　者：白娟娟 吴晓明 华玉林 穆雪 毕文涛 苏跃举 焦志强 申利莹 印寿根 郑加金 

机构地区：[1]Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, Tianjin Key Laboratory of Photoelectric Materials and Devices, School of Materials Science and Engineering, Tianjin University of Technology [2]College of Optoelectronics Engineering, Nanjing University of Posts and Telecommunications

出　　处：《Chinese Physics B》2013年第4期504-507,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 60906022 and 60676051);the Natural Science Foundation of Tianjin,China (Grant No. 10JCYBJC01100);the Scientific Developing Foundation of Tianjin Education Commission, China (Grant No. 2011ZD02);the Jiangsu Provincial Natural Science Development Foundation for University, China (Grant No. 09KJB140006);the Tianjin Natural Science Council (Grant No. 10SYSYJC28100)

摘　　要：We demonstrate high current efficiency of a blue fluorescent organic light-emitting diode （OLED） by using the charge control layers （CCLs） based on Alq3 . The CCLs that are inserted into the emitting layers （EMLs） could impede the hole injection and facilitate the electron transport, which can improve the carrier balance and further expand the exciton generation region. The maximal current efficiency of the optimal device is 5.89 cd/A at 1.81 mA/cm2 , which is about 2.19 times higher than that of the control device （CD） without the CCL, and the maximal luminance is 19.660 cd/m2 at 12V. The device shows a good color stability though the green light emitting material Alq3 is introduced as the CCL in the EML, but it has a poor lifetime due to the formation of cationic Alq3 species.We demonstrate high current efficiency of a blue fluorescent organic light-emitting diode （OLED） by using the charge control layers （CCLs） based on Alq3 . The CCLs that are inserted into the emitting layers （EMLs） could impede the hole injection and facilitate the electron transport, which can improve the carrier balance and further expand the exciton generation region. The maximal current efficiency of the optimal device is 5.89 cd/A at 1.81 mA/cm2 , which is about 2.19 times higher than that of the control device （CD） without the CCL, and the maximal luminance is 19.660 cd/m2 at 12V. The device shows a good color stability though the green light emitting material Alq3 is introduced as the CCL in the EML, but it has a poor lifetime due to the formation of cationic Alq3 species.

关 键 词：organic light-emitting devices charge control layer current efficiency 

分 类 号：TN312.8[电子电信—物理电子学] TN873.3