物理化学学报 >> 2007, Vol. 23 >> Issue (04): 455-458.doi: 10.1016/S1872-1508(07)60029-1

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四(8-羟基喹啉)硼锂作为电子注入层的高效有机发光二极管

张锐; 李杨; 段炼; 张德强; 邱勇   

  1. 清华大学化学系, 有机光电子与分子工程教育部重点实验室, 北京 100084
  • 收稿日期:2007-01-10 修回日期:2007-02-05 发布日期:2007-04-05
  • 通讯作者: 张德强 E-mail:zhangdq@mail.tsinghua.edu.cn

Efficient Organic Light-emitting Diode Using Lithium Tetra-(8-hydroxy-quinolinato) Boron as the Electron Injection Layer

ZHANG Rui; LI Yang; DUAN Lian; ZHANG De-Qiang; QIU Yong   

  1. Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
  • Received:2007-01-10 Revised:2007-02-05 Published:2007-04-05
  • Contact: ZHANG De-Qiang E-mail:zhangdq@mail.tsinghua.edu.cn

摘要:

采用四(8-羟基喹啉)硼锂(LiBq4)代替LiF 作为电子注入材料, 以金属铝作为阴极, 制备了有机电致发光器件. 器件采用N,N'-(α-萘基)-N,N'-苯基联苯二胺(NPB)作为空穴传输层, 三(8-羟基喹啉)铝(Alq3)作为电子传输层和发光层. 采用LiBq4作为电子注入层, 实验结果表明, 器件的亮度、电流效率和起亮电压等性能均有改善, 超过了采用LiF作为电子注入层的器件.器件性能的提升可以用电子注入增强和电荷平衡来解释.

关键词: 四(8-羟基喹啉)硼锂, 电子注入, 有机发光二极管

Abstract:

High performance organic light-emitting diodes (OLEDs) with lithium tetra-(8-hydroxy-quinolinato) boron (LiBq4), instead of LiF, as the electron injection layer, and aluminum as the cathode were fabricated. In the fabrication of the devices, N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB) was used as the hole transport layer, and tri-(8-quinolinolato) aluminum (Alq3) as the emitting and electron transport layer. By using LiBq4 as the electron injection layer, the device's performance with regard to luminance, current efficiency, and turn-on voltage was superior to that of the device using LiF as the electron injection layer. The experimental results could be explained by the improved electron injection and charge balance.

Key words: Lithiumtetra-(8-hydroxy-quinolinato) boron, Electron injection, Organic light-emitting diodes

MSC2000: 

  • O644