| Alq3 有机发光二极管中的正负磁电导转变 |
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| 引用本文： | 张勇,张巧明,刘亚莉,熊祖洪. Alq3 有机发光二极管中的正负磁电导转变[J]. 科学通报, 2011, 56(18): 1425-1430. DOI: 10.1360/972011-72 |
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| 作者姓名： | 张勇 张巧明 刘亚莉 熊祖洪 |
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| 作者单位： | 发光与实时分析教育部重点实验室西南大学物理科学与技术学院; |
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| 基金项目： | 教育部留学回国人员科研启动基金(教外司留[2010]1174号); 重庆市自然科学基金(CSTC2010BB9123); 中央高校基本科研业务费专项资金(XDJK2009C085); 西南大学博士基金(SWUB2008016)资助项目 |
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| 摘 要： | 制备了基于Alq3 的有机发光二极管, 器件结构为ITO/CuPc/NPB/Alq3/LiF/Al, 并在不同温度下测量了器件在恒压偏置下传导电流的磁电导效应. 当Alq3 发光层的厚度为15 nm 时, 在器件的传导电流从双极电流过渡到单极电流的过程中, 器件的磁电导发生了明显的正负转变; 而当Alq3 发光层的厚度为65 nm 时, 在传导电流从双极电流到单极电流的过渡过程中, 器件的磁电导呈现随电流减小先上升后下降的变化趋势, 但磁电导的值在任何测量条件下始终为正, 并未出现正负转变的现象. 双极电流的磁电导效应可用电子-空穴对模型和激子-电荷反应模型来进行解释, 而单极电流的磁电导效应虽然可归因于器件中的极化子-双极化子转变, 但仍需要进一步的研究.
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| 关 键 词： | 有机发光二极管 磁电导转变 单极电流 双极化子 |
| 收稿时间： | 2011-01-27 |
Positive-negative inversion of magnetoconduce in Alq_3-based organic light-emitting diode |
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| ZHANG Yong,ZHANG QiaoMing,LIU YaLi , XIONG ZuHong MOE Key Laboratory on Luminescence , Real-Time Analysis,School of Physical Science , Technology,Southwest University,Chongqing ,China. Positive-negative inversion of magnetoconduce in Alq_3-based organic light-emitting diode[J]. Chinese Science Bulletin, 2011, 56(18): 1425-1430. DOI: 10.1360/972011-72 |
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| Authors: | ZHANG Yong ZHANG QiaoMing LIU YaLi & XIONG ZuHong MOE Key Laboratory on Luminescence Real-Time Analysis School of Physical Science Technology Southwest University Chongqing China |
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| Affiliation: | ZHANG Yong,ZHANG QiaoMing,LIU YaLi & XIONG ZuHong MOE Key Laboratory on Luminescence and Real-Time Analysis,School of Physical Science and Technology,Southwest University,Chongqing 400715,China |
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| Abstract: | Organic light-emitting diodes (OLEDs) based on Alq3 have been fabricated. The structure of devices is ITO/CuPc/NPB/Alq3/LiF/Al. The magnetoconductance (MC) effect on the current was measured with constant voltage bias. When the thickness of Alq3 layer is 15 nm, an apparent positive-negative inversion of MC occurred during the current transition from bipolar to unipolar. When the thickness of Alq3 layer was 65 nm, the MC values increased firstly and then fell with the decreasing current during the current tr... |
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| Keywords: | organic light-emitting diode inversion of magnetoconductance unipolar current bipolaron |
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