中国物理B ›› 2007, Vol. 16 ›› Issue (3): 730-734.doi: 10.1088/1009-1963/16/3/028

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

张波1, 唐先忠1, 聂海2   

  1. (1)School of Microelectronics and Solid-State Electronics, University of Electronics Science and Technology of China, Chengdu 610054, China; (2)School of Microelectronics and Solid-State Electronics, University of Electronics Science and Technology of China, Chengdu 610054, China;Chengdu University of Information Technology, Chengdu 610225, China
  • 收稿日期:2005-10-10 修回日期:2006-06-27 出版日期:2007-03-20 发布日期:2007-03-20
  • 基金资助:
    Project supported by the Key Project of Science and Technology of Sichuan Province, China(03GG009－002).

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

Nie Hai(聂海)a)b), Zhang Bo(张波)a), and Tang Xian-Zhong(唐先忠)a)   

  1. a School of Microelectronics and Solid-State Electronics, University of Electronics Science and Technology of China, Chengdu 610054, China; b Chengdu University of Information Technology, Chengdu 610225, China
  • Received:2005-10-10 Revised:2006-06-27 Online:2007-03-20 Published:2007-03-20
  • Supported by:
    Project supported by the Key Project of Science and Technology of Sichuan Province, China(03GG009－002).

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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 electron transport layer are doped simultaneously with different 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.

关键词: heterojunction, doping, organic electroluminescence, stability

Abstract: 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 electron transport layer are doped simultaneously with different 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?rster energy transfer.

Key words: heterojunction, doping, organic electroluminescence, stability

中图分类号:  (Light-emitting devices)

  • 85.60.Jb
61.72.up (Other materials) 78.60.Fi (Electroluminescence) 85.60.Bt (Optoelectronic device characterization, design, and modeling)