Dependence of the stability of organic light-emitting diodes on driving mode  

作　　者：ZHANG WenWen WU ZhaoXin ZHANG XinWen LIANG ShiXiong JIAO Bo HOU Xun 

机构地区：[1]State Key Laboratory of Transient Optics and Photonics,Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi’an 710119,China [2]Key Laboratory for Physical Electronics and Devices of the Ministry of Education,School of Electronic and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China [3]Key Laboratory of Photonics Technology for Information of Shaanxi Province,School of Electronic and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China

出　　处：《Chinese Science Bulletin》2011年第21期2210-2214,共5页

基　　金：supported by the National Natural Science Foundation of China (10904122)

摘　　要：We investigated the effects of pulsed current (PC) and direct current (DC) driving modes on the stability of organic light-emitting diodes with and without hole-injection layers (HILs).Two different HIL materials were used:copper phthalocyanine (CuPc) and 4,4',4″-tris(3-methylphenylphenylamino)triphenylamine (m-MDTATA).It was found that the half-lives of devices using PC driving modes were different from those of comparable devices using DC driving modes.For the devices without HILs,with CuPc HILs and with MTDATA HILs,the half-lives of the devices were changed by factors of 1.91,1.41 and 0.86,respectively,when operated in PC rather than DC driving modes.Our analysis of the electrical characteristics of the corresponding hole-only devices showed that the number of holes injected into devices was greatly reduced by inserting an m-MTDATA layer compared with other designs.The results indicate that different ratios of injected electrons and holes can be obtained in these devices.Moreover,these ratios play a dominant role in the dependence of the stability of the device on the driving mode.We investigated the effects of pulsed current (PC) and direct current (DC) driving modes on the stability of organic light-emitting diodes with and without hole-injection layers (HILs).Two different HIL materials were used:copper phthalocyanine (CuPc) and 4,4',4″-tris(3-methylphenylphenylamino)triphenylamine (m-MDTATA).It was found that the half-lives of devices using PC driving modes were different from those of comparable devices using DC driving modes.For the devices without HILs,with CuPc HILs and with MTDATA HILs,the half-lives of the devices were changed by factors of 1.91,1.41 and 0.86,respectively,when operated in PC rather than DC driving modes.Our analysis of the electrical characteristics of the corresponding hole-only devices showed that the number of holes injected into devices was greatly reduced by inserting an m-MTDATA layer compared with other designs.The results indicate that different ratios of injected electrons and holes can be obtained in these devices.Moreover,these ratios play a dominant role in the dependence of the stability of the device on the driving mode.

关 键 词：有机发光二极管 驾驶模式 稳定 ILS设备 驱动模式 脉冲电流 CUPC 电气特性 

分 类 号：TN312.8[电子电信—物理电子学] U469.11[机械工程—车辆工程]