Significant improvement of OLED efficiency and stability by doping both HTL and ETL with different dopant in heterojunction of polymer/small-molecules

• 来源期刊: 中国物理（英文版）
• 关键词: heterojunction doping organic electroluminescence stability
• 年，卷（期）: 2007,（3）
• 页码范围: 730-734
• 页数: 5页
• 语种: 英文

摘要

This paper reports that the polymer/organic heterojunction doped light-emitting diodes using a novel poly-TPD as hole transport material and doping both hole transport layer and emitter layer with the highly fluorescent rubrene and DCJTB has been Successfully fabricated.The basic structure of the heterostructure is PTPD/Alq3.when hole transport layer and electton transport layer are doped simultaneously with difierent dopant,the electroluminescence quantum efficiencies are about 3 times greater than that of the undoped device.Compared with undoped device and conventional TPD/Alq3 diode,the stability of the doping device is significantly improved.The process of emission for doped device may include carrier trapping as well as F(o) rster energy transfer.