| 高效率的有机电致发光器件 |
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| 引用本文： | 赵伟明,李述汤,张步新,朱文清,蒋雪茵,张志林,许少鸿.高效率的有机电致发光器件[J].发光学报,2000,21(1):81-83. |
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| 作者姓名： | 赵伟明 李述汤 张步新 朱文清 蒋雪茵 张志林 许少鸿 |
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| 作者单位： | 1. 上海大学,材料科学与工程学院,上海,201800
2. 香港城市大学,物理及材料科学系 |
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| 基金项目： | 国家自然科学基金!重大项目 ( 5 9790 0 5 0 )，上海市教委 ( 99A2 9)资助项目 |
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| 摘 要： | 有机电致发光器件 (OL EDs)的发光机理包括电子和空穴从电极的注入、激子的形成及复合发光 ,其中 ,空穴和电子的注入平衡是非常重要的。为了平衡载流子的注入以得到高效率和稳定性好的器件 ,人们不仅使用了电子注入更为有效的 L i F/ Al1] 和 Cs F/ Al2 ] 等复合电极 ,同时也使用了空穴缓冲层 ,如 S.A.Van Slyke等 3]在ITO和 NPB之间使用 Cu Pc,使得器件的稳定性得到了明显的提高 ;A.Gyoutoku等4 ] 用碳膜使器件的半寿命超过 3 5 0 0小时 ;最近 ,Y.Kurosaka等 5]和 Z.B.Deng6 ]分别在 ITO和空穴传输层之间插入一薄层 Al…
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| 关 键 词： | 缓冲层 有机薄膜 发光二极管 电致发光器件 |
| 文章编号： | 1000-7032(2000)01-0081-03 |
| 修稿时间： | 1999-08-03 |
High Efficiency Organic Thin Film Electroluminescent Devices |
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| ZHAO Wei-ming,Lee Shu-tang,ZHANG Bu-xin,ZHU Wen-qing,JIANG Xue-yin,ZHANG Zhi-lin,XU Shao-hong.High Efficiency Organic Thin Film Electroluminescent Devices[J].Chinese Journal of Luminescence,2000,21(1):81-83. |
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| Authors: | ZHAO Wei-ming Lee Shu-tang ZHANG Bu-xin ZHU Wen-qing JIANG Xue-yin ZHANG Zhi-lin XU Shao-hong |
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| Affiliation: | ZHAO Wei ming 1,Lee Shu tang 2,ZHANG Bu xin 1,ZHU Wen qing 1,JIANG Xue yin 1,ZHANG Zhi lin 1,XU Shao hong 1 |
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| Abstract: | The operating mechanisms of the OLEDs involve injection of electrons and holes from the electrodes, and electron hole recombination which emits the light. To balance the numbers of electrons and holes injected from electrode and obtain high emission efficiency, several hole injecting buffer layers such as CuPc, Carbon, Al 2O 3 and SiO 2 have been used to improve the efficiency and lifetime of the OLEDs. In this study, highly efficienct and bright organic electroluminescent devices were developed using lithium fluoride (LiF) film as hole and electron injecting layers. Typical OLEDs have the structure of ITO glass/LiF/NPB(70nm)/Alq(70nm)/LiF(0.5nm)/Al(200nm). The device with a 2.0nm LiF hole injecting layer showed the luminance of 1210cd/m 2 at 20mA/cm 2 which corresponds to an efficiency of 6.0cd/A. In contrast, the device without LiF hole injecting layer exhibited 617cd/m 2 at the same current density which showed an efficiency of 3.2cd/A. These results suggest that the LiF hole injecting layer with a proper thickness can enhance the efficiency of the OLEDs due to blocking the injection of holes. |
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| Keywords: | buffer layer organic thin film electroluminescent devices |
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