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磁场对有机电致发光的影响
引用本文:王振,何正红,谭兴文,陶敏龙,李国庆,熊祖洪.磁场对有机电致发光的影响[J].物理学报,2007,56(5):2979-2985.
作者姓名:王振  何正红  谭兴文  陶敏龙  李国庆  熊祖洪
作者单位:西南大学物理科学与技术学院,重庆 400715
基金项目:国家自然科学基金;教育部跨世纪优秀人才培养计划;霍英东教育基金;人事部留学回国人员科技活动择优基金;重庆市自然科学基金
摘    要:制备了常规有机发光二极管ITO/NPD/Alq3/LiF/Al,测量了该器件发光的磁场效应.发现尽管在1T范围内的磁场对发光层Alq3的光致发光没有影响,但磁场作用下器件的电致发光(MEL)却呈现出明显的磁效应,且MEL与器件的偏压有很强的依赖关系:在小偏压时,随着磁场的增加MEL是单调递增,且在大小约为40kA/m的磁场下达到饱和,之后即使磁场增大到约1T 的情况下也没有变化;但当偏压变大时,MEL则呈现先增加,在40kA/m处达到峰值后却又减弱,而且偏压越大该MEL的减弱则越明显.对所观察到的实验结果进行了定形解释,即三线态激子相互淬灭产生单线态激子和三线态激子与器件中的非平衡载流子相互作用是此效应的物理机理. 关键词: 有机发光 磁场效应 激子淬灭

关 键 词:有机发光  磁场效应  激子淬灭
文章编号:1000-3290/2007/56(05)/2979-07
收稿时间:2006-09-27
修稿时间:09 27 2006 12:00AM

Magnetic field effects on organic electroluminescence
Wang Zhen,He Zheng-Hong,Tan Xing-Wen,Tao Min-Long,Li Guo-Qing,Xiong Zu-Hong.Magnetic field effects on organic electroluminescence[J].Acta Physica Sinica,2007,56(5):2979-2985.
Authors:Wang Zhen  He Zheng-Hong  Tan Xing-Wen  Tao Min-Long  Li Guo-Qing  Xiong Zu-Hong
Institution:School of Physical Science and Technology, Southwest University, Chongqing 400715, China
Abstract:A conventional organic light emitting diode, which has a structure of ITO/NPD/Alq_3/LiF/Al, was fabricated and the magnetic field effects(MFEs) on its electroluminescence(EL) were measured. We found that the MFEs of the organic EL is strongly dependent on the applied bias on the device while the photoluminescence from the Alq_3 film within the device is independent of the magnetic field. At low bias, the MFEs first rapidly increase with the magnetic field and then saturate at about 40kA/m, however at high bias the MFEs will decrease after this saturation, and the larger the bias, the stronger the decrease. The mutual annihilation of triplet-triplet pairs producing excited singlet excitons and the interaction between triplet excitons and excess carriers of Alq_3 anion or cation are the physical mechanisms of the phenomena observed in this study.
Keywords:organic electroluminescence  magnetic field effects  exciton annihilation
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