| 高分子发光二极管载流子注入过程研究 |
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| 引用本文： | 黄文波,彭俊彪.高分子发光二极管载流子注入过程研究[J].物理学报,2007,56(5):2974-2978. |
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| 作者姓名： | 黄文波 彭俊彪 |
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| 作者单位： | (1)华南理工大学高分子光电材料及器件研究所，广州 510640; (2)华南理工大学高分子光电材料及器件研究所，广州 510640；华南理工大学特种功能材料及其制备新技术教育部重点实验室，广州 510640 |
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| 基金项目： | 国家自然科学基金;教育部科学技术研究重点项目;国家重点基础研究发展计划(973计划) |
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| 摘 要： | 采用交流阻抗谱，电容-电压，电容-频率等实验方法，研究了共轭高分子MEH-PPV(poly［2-methoxy，5-(2-ethylhexoxy)-1，4-phenylene vinylene］)发光二极管的载流子注入过程.对于结构为ITO/PEDOT/MEH-PPV/Ba/Al的发光器件，实验结果表明，电极界面是欧姆接触的，载流子的注入是非平衡的，器件薄膜中存在陷阱容易俘获注入电荷，形成空间电荷区，陷阱密度约为3.75×1016cm-3.
关键词：
高分子发光二极管
交流阻抗谱
cole-cole图
载流子注入
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| 关 键 词： | 高分子发光二极管 交流阻抗谱 cole-cole图 载流子注入 |
| 文章编号： | 1000-3290/2007/56(05)/2974-05 |
| 收稿时间： | 2006-10-09 |
| 修稿时间： | 10 9 2006 12:00AM |
Carrier injection process of polymer light-emitting diodes |
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| Huang Wen-Bo,Peng Jun-Biao.Carrier injection process of polymer light-emitting diodes[J].Acta Physica Sinica,2007,56(5):2974-2978. |
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| Authors: | Huang Wen-Bo Peng Jun-Biao |
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| Affiliation: | 1.Institute of Polymer Optoelectronic Material and Devices, South China University of Technology, Guangzhou 510640, China; 2. Key laboratory of Specially Functional Materials and Advanced Manufacturing Technology, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | The carrier injection process of polymer light-emitting diodes (PLEDs) with MEH-PPV(poly［2-methoxy，5-(2-ethylhexoxy)-1，4-phenylene vinylene］) as the light-emitting layer, was investigated using impedance spectroscopy, capacitance-voltage (C-V) and capacitance-frequency (C-F) techniques. The diodes have the configuration of ITO/PEDOT/MEH-PPV/Ba/Al. The experiments showed that there is an ohmic contact between electrodes and MEH-PPV, and holes and electrons injected from the cathodes are unbalanced. Charged traps in the MEH-PPV result in space-charge under positive bias, and the trap concentration was estimated at about 3.75×1016cm-3. |
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| Keywords: | polymer light-emitting diodes (PLEDs) impedance spectroscopy cole-cole figure carrier injection |
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