半导体光电, 2013, 34 (2): 200, 网络出版: 2013-05-24
基于Cs2CO3/Al结构的蓝光OLED器件
Blue Organic Light-emitting Diode with the Structure of Cs2CO3/Al
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。
Abstract
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/Al, BLEDs with the structure of Cs2CO3/Al owns higher electron injection. By systematically varying the Cs2CO3 thickness, a maximum current efficiency of 3.04cd/A was obtained at a lower current density of 13.2mA/cm2 for the device with 1.5nm Cs2CO3 layer as the electron-injection layer. The results show that the vacuum evaporation of Cs2CO3 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.
张静, 张方辉, 张宵. 基于Cs2CO3/Al结构的蓝光OLED器件[J]. 半导体光电, 2013, 34(2): 200. ZHANG Jing, ZHANG Fanghui, ZHANG Xiao. Blue Organic Light-emitting Diode with the Structure of Cs2CO3/Al[J]. Semiconductor Optoelectronics, 2013, 34(2): 200.
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