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Citation: XU Jian-Hua, YANG Ya-Jie, JIANG Ya-Dong, YU Jun-Sheng. Synthesis of Ordered Conducting Polymer Ultrathin Film and Its Application as Hole Injection Layer for Organic Light-Emitting Diode[J]. Acta Physico-Chimica Sinica, ;2009, 25(01): 19-24. doi: 10.3866/PKU.WHXB20090104 shu

Synthesis of Ordered Conducting Polymer Ultrathin Film and Its Application as Hole Injection Layer for Organic Light-Emitting Diode

1.
State Key Laboratory of Electronic Thin Films & Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, P. R. China

Received Date: 3 September 2008
Available Online: 20 November 2008

A novel layer-ordered ultrathin film of poly(3,4-ethylene dioxythiophene)/arachidic acid (PEDOT:AA) was prepared by a modified Langmuir-Blodgett (LB) technique and an ordered conducting polymer embedded multilayer structure was constructed. The layer-ordered structure was deposited on an indium-tin oxide (ITO) surface as a hole injection layer for use as an organic light-emitting diode (OLED) and the luminance performance of the ITO/(PEDOT:PSS)/MEH-PPV(poly(2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylene-vinylene))/Al device was investigated. Compared with electrostatic self-assembly (ESA) and spin-coating the poly(3,4-ethylene dioxythiophene)/polystyrenesulfonate (PEDOT:PSS) film showed enhanced luminance efficiency. The higher luminance at an equivalent voltage and lower turn-on voltage was observed after the PEDOT:AA film was utilized as hole injection layer in OLED. The enhanced carrie injection efficiency was attributed to the od layer-ordered structure of PEDOT:AA film, which decreased the contact resistance between ITO and the emitting layer. Further investigation revealed that this layer-ordered conducting polymer film exhibited poor temperature stability because of weak hydrophilic and hydrophobic interactions between adjacent LB layers. These weak interactions result in the film structure changing from a layer-ordered structure into an unordered structure at higher temperatures.
- Conducting polymer; Langmuir-Blodgett film; OLED; Hole injection layer; Self-assembly film
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