| Alq3有机发光二极管中的激子湮灭过程及其磁场效应 |
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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激子湮灭过程及其磁场效应[J].中国科学:物理学 力学 天文学,2011(9):1089-1095. |
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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,重庆400715 |
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| 基金项目： | 教育部留学回国人员科研启动基金（编号：[2010]1174）; 重庆市自然科学基金（编号：CSTC2010BB9123 CSTC2010BA6002）; 国家自然科学基金（批准号：10974157）; 中央高校基本科研业务费专项资金（编号：XDJK2009C085）资助项目 |
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| 摘 要： | 在基于Alq3的有机发光二极管中,器件的电致发光包括瞬时荧光与延迟荧光两部分.二者都可以受外加磁场影响,但对磁场的依赖关系不同.由此推导出了在不同磁场强度时瞬时光强度与延迟光强度和总发光强度之间的经验公式.基于对延迟光强度磁场效应的合理估计,分别计算了器件在不同温度、不同电流下的瞬时光与延迟光强度,以及二者随外加磁场的变化.利用Merrifield关于激子湮灭的唯象理论,深入分析了在完全有序和完全无序两种体系中的三重态激子湮灭过程及其磁场效应.
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| 关 键 词： | 有机发光二极管 激子湮灭 延迟荧光 磁场效应 |
Exciton annihilation and its magnetic-field effect in Alq3-based organic light-emitting diode |
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| ZHANG Yong,ZHANG QiaoMing,LIU YaLi,XIONG ZuHong.Exciton annihilation and its magnetic-field effect in Alq3-based organic light-emitting diode[J].Scientia Sinica Pysica,Mechanica & Astronomica,2011(9):1089-1095. |
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| Authors: | ZHANG Yong ZHANG QiaoMing LIU YaLi XIONG ZuHong |
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| Institution: | 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: | In Alq3-based organic light-emitting diodes,the electroluminescence（EL） of device is composed of the prompt fluorescence（PF） and delayed fluorescence（DF）.Both of them can be modulated by an applied magnetic field,but their dependences on the magnetic field are different.Thereafter the formulas between the intensities of PF,DF,and the total EL at different B field are deduced.Basing on a suitable estimation for the magnetic-field effect（MFE） on DF,the intensities of PF and DF,as well as the MFE of DF,are calculated at different temperatures and currents.Employing the Merrifield＇s phenomenological scheme,the T-exciton annihilation and its MFE in fully ordered and fully random systems are thoroughly analyzed. |
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| Keywords: | organic light-emitting diode exciton annihilation delayed fluorescence magnetic-field effect |
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