| 聚合物发光二极管中的负电容效应 |
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| 引用本文： | 黄文波,曾文进,王藜,彭俊彪.聚合物发光二极管中的负电容效应[J].物理学报,2008,57(9):5983-5988. |
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| 作者姓名： | 黄文波 曾文进 王藜 彭俊彪 |
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| 作者单位： | (1)华南理工大学聚合物光电材料及器件研究所，广州 510640; (2)华南理工大学聚合物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： | 采用交流阻抗谱技术，研究了以共轭聚合物(poly［2-methoxy,5-(2′-ethylhexoxy)-1,4-phenylenevinylene］)(MEH-PPV)为发光层，以带有胺基的聚芴共聚物poly［(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)］ (PF-NR2)为电子传输层的发光二极管的交流响应特性. 对于结构为ITO/P
关键词：
2')" href="#">PF-NR2
聚合物发光二极管
交流阻抗谱
负电容效应
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| 关 键 词： | PF-NR2 聚合物发光二极管 交流阻抗谱 负电容效应 |
| 收稿时间： | 2007-10-24 |
| 修稿时间： | 3/3/2008 12:00:00 AM |
Negative capacitance in polymer light-emitting diodes |
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| Huang Wen-Bo,Zeng Wen-Jin,Wang Li,Peng Jun-Biao.Negative capacitance in polymer light-emitting diodes[J].Acta Physica Sinica,2008,57(9):5983-5988. |
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| Authors: | Huang Wen-Bo Zeng Wen-Jin Wang Li Peng Jun-Biao |
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| Abstract: | A.c. electrical properties of the heterostructured polymer light-emitting diode consisting of poly［2-methoxy-5-(2′-ethyl-hexyloxy)- 1, 4-phenylenevinylene］(MEH-PPV) as the light-emitting layer, and poly［(9,9 - bis(3′-(N,N-dimethylamino) propyl)-2,7- fluorene)-alt-2,7-(9,9-dioctylfluorene)］ (PF-NR2) as the electron-injecting layer, are studied by using impedance spectroscopy. Negative capacitance in impedance spectroscopic data has been observed. According to the Cole-Cole plot of the device ITO/PEDOT/MEH-PPV/PF-NR2/Al, the a.c. response of MEH-PPV/PF-NR2 interface can be explained in terms of the equivalent circuit model of a parallel combination of an inductance L and a resistance RL. The experiments showed that PF-NR2 could act as an electron injecting and hole blocking layer. We propose an energy band structure schematic diagram to explain the enhancement of the EL efficiency in the ITO/PEDOT/MEH-PPV/PF-NR2/Al structure. |
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| Keywords: | PF-NR2 |
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