| 基于Cs2CO3/Al结构的蓝光OLED器件 |
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| 引用本文： | 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): 200-203 |
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| 作者姓名： | 张静 张方辉 张宵 |
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| 作者单位： | 陕西科技大学电气与信息工程学院,西安,710021 |
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| 基金项目： | 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) |
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| 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。
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| 关 键 词： | 有机电致发光器件 碳酸铯 电子注入层 |
| 收稿时间： | 2012-09-14 |
Blue Organic Light-emitting Diode with the Structure of Cs2CO3/Al |
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| ZHANG Jing,ZHANG Fanghui and ZHANG Xiao. Blue Organic Light-emitting Diode with the Structure of Cs2CO3/Al[J]. Semiconductor Optoelectronics, 2013, 34(2): 200-203 |
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| Authors: | ZHANG Jing ZHANG Fanghui ZHANG Xiao |
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| Affiliation: | (School of Electric and Information Engineering,Shannxi University of Science and Technology,Xi’an 710021,CHN) |
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| Abstract: | It is investigated the effects of using cesium carbonate (Cs2CO3/Al) 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 theCs2CO3 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. |
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| Keywords: | organic light emitting diodes cesium carbonate electron injection |
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