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.
出处
《半导体光电》
CAS
CSCD
北大核心
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)
关键词
有机电致发光器件
碳酸铯
电子注入层
organic light emitting diodes
cesium carbonate
electron injection
