基于Cs_2CO_3/Al结构的蓝光OLED器件  

Blue Organic Light-emitting Diode with the Structure of Cs_2CO_3/Al

作　　者：张静[1] 张方辉[1] 张宵[1] 

机构地区：[1]陕西科技大学电气与信息工程学院,西安710021

出　　处：《半导体光电》2013年第2期200-203,共4页Semiconductor Optoelectronics

基　　金：国家自然科学基金项目(61076066);陕西科技大学博士基金项目(BJ09-07);陕西科技大学自然科学基金项目(ZX09-31)

摘　　要：研究了碳酸铯(Cs2CO3)作为电子注入层对蓝光有机电致发光器件性能的影响。结果表明,与常用的LiF/Al结构相比,Cs2CO3/Al结构的电子注入能力更强。对Cs2CO3电子注入层的厚度进行了优化,表明Cs2CO3厚度为1.5nm时,器件的发光效率和功率效率有很大提高,在较低电流密度(13.2mA/cm2)下即达到其最大发光效率(3.04cd/A),分析得到真空蒸镀Cs2CO3能够有效提高电子注入的机理:低功函的金属Cs起到了克服肖特基势垒、增强电子注入的作用。It is investigated the effects of using cesium carbonate （Cs2CO3） as the organic electron-injection layer on the performance of blue organic light-emitting diodes （BLEDs）. It is proved that, compared with the structure of LiF/A1, BLEDs with the structure of Cs2COa/A1 owns higher electron injection. By systematically varying the Cs2CO3 thickness, a maximum current efficiency of 3.04 cd/A was obtained at a lower current density of 13. Z mA/cm2 for the device with 1. 5 nm Cs2CO3 layer as the electron-injection layer. The results show that the vacuum evaporation of Cs2 CO3 can efficiently improve the mechanism of electron injection ability, and the metal Cs with a low power function overcomes the Schottky barrier and enhances electronic injection.

关 键 词：有机电致发光器件 碳酸铯 电子注入层 

分 类 号：TN383.1[电子电信—物理电子学]