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《Chinese Journal of Luminescence》 2005-01
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Field Emission Characteristics of Conducting Polyme

LAI Guo-hong, PENG Jun-biao, LI Zheng-lin, CHENG Lan, CAO Yong(Institute of Polymer Optoelectric Materials and Devices, South China University of Technology, Guangzhou 510640, China)  
The development of field emission display (FED) has been the subject of (increasing) scientific (interest) due to their extensive application in flat panel display and microelectronics area. The cathode(electron-emitter) material is one of the key factors for FED. So far, many kinds of emitters were discovered, such as metal emitters (Spindle-type field emitters), silicon emitters, diamond film emitters, diamond-like carbon (DLC) film (emitters) and carbon nanotube emitters. But it is intricate for most of the emitters in producing process and difficult to be fabricated in large area. However, some polymers, which are quite cheap, easy to synthesize, (soluble) in organic solvents to make high quality films in large area by using convenient methods, were created in making the emitters. Pure polymer emitters were demonstrated by Musa, and further work was done in our group. The great difference between our work and Musa's is that we used conducting polymers while Musa used insulated polymers. What is more, Musa's paper only gives the field emission I-V curve, the light emission (image) had not been showed. We believe that the conducting polymers have high conductivity, which is expected to bring about a low turn-on emission field, high emitting current density, and better picture quality. In our experiment, the conducting polymers, CSA-doped polyaniline (PANI-CSA), was made on a cleaned (1 cm×)(1 cm) ITO substrate by spin-coating method and then dried on a heater. A display prototype has been fabricated using ZnO∶Zn(phosphor)-coated ITO as an anode. The prototype of our FED device was placed into a vacuum chamber for field emission testing. The relationship between the emission current and the voltage fits the Fowler-Nordheim equation, and the enhancing factor β calculated based on our I-V data is 430. The (emission) current stability was tested for 50 min. No obvious decrease of the current was observed. By way of studying the surface appearance of conducting polymer after field emission, we analyze the emission mechanism and consider the sunken and protrude shapes produced from initial planar surface by applied high fields playing an important role in increasing the enhancing factor.
【Fund】: 国家自然科学基金(29974010);; 广州市科技局(2001 2 121 01)资助项目
【CateGory Index】: TN873.95
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