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.
Received: 10 October 2005
Revised: 27 June 2006
Accepted manuscript online:
(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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