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电子学报 ›› 2006, Vol. 34 ›› Issue (10): 1933-1936.

• 论文 • 上一篇    

注入和复合对单层有机发光器件电致发光效率的影响

李宏建1, 朱儒晖1, 黄伯云2, 易丹青2, 彭景翠3   

  1. 1. 中南大学物理科学与技术学院,湖南长沙 410083,;2. 中南大学材料科学与工程学院,湖南长沙 410083;3. 湖南大学应用物理系,湖南长沙 410082
  • 收稿日期:2004-07-10 修回日期:2005-03-20 出版日期:2006-10-25 发布日期:2006-10-25

The Influences of Injection and Recombination on the Electroluminescence Efficiency in Single-Layer Organic Light Emitting Devices

LI Hong-jian1, ZHU Ru-hui1, HUANG Bai-yun2, YI Dan-qing2, PENG Jing-cui3   

  1. 1. College of Physics Science and Technology,Central South University,Changsha,Hunan 410083,China;2. College of Materials Science and Engineering,Central South University,Changsha,Hunan 410083,China;3. Department of Applied Physics,Hunan University,Changsha,Hunan 410082,China
  • Received:2004-07-10 Revised:2005-03-20 Online:2006-10-25 Published:2006-10-25

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摘要： 考虑电荷的注入、无序系统中载流子的输运及极化子激子的解离和复合过程,建立了单层有机电致发光器件电致发光效率的理论模型.计算并讨论了离化距离对器件复合效率以及注入和复合对器件电致发光效率的影响.结果表明:(1) 通过降低金属/有机物界面势垒可以显著提高器件的EL效率;(2)当两电极均为欧姆接触或一个电极欧姆接触,一个电极是接触限制时,在低场下EL效率由注入决定,而高场下复合起主要作用;(3)当两电极均为接触限制时,EL效率主要由注入过程来决定.此模型可以较好地解释一些实验现象.

关键词: 有机电致发光器件, 电致发光效率, 注入效率, 复合效率

Abstract: An analytical model to calculate the electroluminescence (EL) profiles in single layer structure was presented,taking into account the charge injection process at each electrode,hopping transport in disordered system,disassociation and recombination of polaron-excitons.By simulation,the influence of disassociated distance on recombination efficiency and the influence of injection and recombination on EL efficiencies are thoroughly studied.When using both ohmic contacts or an ohmic contact and a contact limited contact,the EL efficiency is determined by injection at lower voltages and recombination at higher voltages.When using both contact limited contacts,the EL efficiency is determined by the injection process.By comparison of the theoretical results with the experimental data reported in the literature,we found this model can reasonably elucidates the influence of some factors on injection and recombination.

Key words: OLEDs, electroluminescent efficiency, injection efficiency, recombination efficiency

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