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Chinese Physics, 2007, Vol. 16(3): 730-734    DOI: 10.1088/1009-1963/16/3/028
CLASSICAL AREAS OF PHENOMENOLOGY Prev   Next  

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)
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
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.
Keywords:  heterojunction      doping      organic electroluminescence      stability  
Received:  10 October 2005      Revised:  27 June 2006      Accepted manuscript online: 
PACS:  85.60.Jb (Light-emitting devices)  
  61.72.up (Other materials)  
  78.60.Fi (Electroluminescence)  
  85.60.Bt (Optoelectronic device characterization, design, and modeling)  
Fund: Project supported by the Key Project of Science and Technology of Sichuan Province, China(03GG009-002).

Cite this article: 

Nie Hai(聂海), Zhang Bo(张波), and Tang Xian-Zhong(唐先忠) Significant improvement of OLED efficiency and stability by doping both HTL and ETL with different dopant in heterojunction of polymer/small-molecules 2007 Chinese Physics 16 730

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