导电高分子场发射特性研究  

Field Emission Characteristics of Conducting Polyme

作　　者：赖国洪[1] 彭俊彪[1] 李政林[1] 程兰[1] 曹镛[1] 

机构地区：[1]华南理工大学高分子光电材料及器件研究所,广东广州510640

出　　处：《发光学报》2005年第1期105-108,i003-i004,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(29974010);广州市科技局(2001 2 121 01)资助项目

摘　　要：用掺杂樟脑磺酸的聚苯胺 (PANI CSA)形成的导电高分子制成的薄膜作为场致发射的阴极材料,用覆盖了荧光层 (ZnO∶Zn)的氧化铟锡 (ITO)做阳极,由所制成的显示器件得到比较稳定的场致电子发射,并具有较低的场发射阈值电压。通过研究导电高分子薄膜形貌,初步分析了场发射电流机制。认为导电高分子薄膜产生场发射的原因是薄膜在高电场作用下,首先在平整的高分子薄膜表面形成了尖锥和凹陷,提高了场强增强因子 (β)。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 emis

关 键 词：导电高分子 聚苯胺 薄膜 场发射 

分 类 号：TN873.95[电子电信—信息与通信工程]