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磁场作用下的有机电致发光

汪津 华杰 丁桂英 常喜 张刚 姜文龙

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磁场作用下的有机电致发光

汪津, 华杰, 丁桂英, 常喜, 张刚, 姜文龙

Effects of magnetic field on organic electroluminescence

Wang Jin, Hua Jie, Ding Gui-Ying, Chang Xi, Zhang Gang, Jiang Wen-Long
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  • 分别制备了荧光器件ITO/NPB/Alq3/LiF/Al和磷光器件ITO/NPB /CBP: Ir(ppy)3/BCP/Alq3/LiF/Al, 测试了50 mT磁场作用下器件的I-V和L-V特性. 与零磁场相比荧光器件和磷光器件的效率分别增加了44%和7%. 从有机电致发光的机制出发对该现象进行了解释, 认为外加磁场可以使三重态激子发生塞曼分裂, 进而在荧光器件中引起了三重态激子T
    Electrofluorescent organic light-emitting device with the structure of ITO/NPB/Alq3/LiF/Al and electrophosphorescent device with the structure of ITO/NPB/CBP: Ir(ppy)3/BCP/Alq3/LiF/Al were fabricated. Their electroluminescence properties were measured under an external magnetic field of 50 mT. Compared to the case of without magnetic field, the electroluminescent(EL) efficiencies of the above-mentioned two kinds of devices increase 44% and 7%, respectively. Based on the luminescence mechanism of organic light-emitting diodes (OLEDs), the observed phenomena were explained. The origin of the improvement can be attributed to the Zeeman split of triplet state due to the external magnetic field influence, resulting in the conversion of triplets T+ into singlet S in the electrofluorescent device and an increase of the rate constants of triplet energy transfer from host to guest in electrophosphorescent device, respectively. At the same time, the reduced concentrations of triplet decreases the interaction of triplets with free carriers, resulting in an increase in the mobility of free carriers within the device and hence increasing the current.
    • 基金项目: 国家自然科学基金(批准号:10804036)、吉林省基础研究计划(批准号:20082112,20080528)和吉林省教育厅科研基金(批准号: [2008]155)资助的课题.
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  • 文章访问数:  1746
  • PDF下载量:  867
  • 被引次数: 0
出版历程
  • 收稿日期:  2009-04-26
  • 修回日期:  2009-06-08
  • 刊出日期:  2009-05-05

磁场作用下的有机电致发光

  • 1. 吉林师范大学信息技术学院, 四平 136000
    基金项目: 

    国家自然科学基金(批准号:10804036)、吉林省基础研究计划(批准号:20082112,20080528)和吉林省教育厅科研基金(批准号: [2008]155)资助的课题.

摘要: 分别制备了荧光器件ITO/NPB/Alq3/LiF/Al和磷光器件ITO/NPB /CBP: Ir(ppy)3/BCP/Alq3/LiF/Al, 测试了50 mT磁场作用下器件的I-V和L-V特性. 与零磁场相比荧光器件和磷光器件的效率分别增加了44%和7%. 从有机电致发光的机制出发对该现象进行了解释, 认为外加磁场可以使三重态激子发生塞曼分裂, 进而在荧光器件中引起了三重态激子T

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