交流电压下聚合物绝缘材料电致发光特性  

Electroluminescence Characteristics From Polymeric Insulating Materials Under AC Voltage

作　　者：杨凯[1] 董明[1] 张冠军[1] 严璋[1] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《电工技术学报》2009年第3期31-35,共5页Transactions of China Electrotechnical Society

基　　金：教育部新世纪优秀人才支持计划(NCET-04-0943);优秀青年教师资助计划项目

摘　　要：设计了绝缘材料电致发光现象研究所用的实验装置,以低密度聚乙烯(LDPE)、聚丙烯(PP)和聚四氟乙烯(PTFE)三种聚合物绝缘材料为样品,研究了交流电压下聚合物材料表面电致发光的时域和相域特性,同时探讨了不同电极材料(铜、铝)以及在材料表面溅射金膜电极对聚合物表面电致发光现象的影响。实验结果显示,不同聚合物材料的电致发光起始电压和发光强度各不相同,但有相似的时域和相域特性曲线,阶升/降电压下的发光曲线均表现出类似于磁滞回线的现象;同时发现不同电极材料下以及溅射金膜电极后的材料的电致发光也表现出不同的发光起始电压和强度。认为电极与材料的接触势垒和材料内部空间电荷影响着材料的电致发光特性。Electroluminescence （EL） measurement setup was designed to study the EL from surface of different polymeric insulation materials under ac voltage. The LDPE, PP and PTFE are employed to investigate their surface EL time-phase-domain characteristics. The effects of different electrode materials （Cu and Al） and sputtered gold film electrode on EL are explored. Experimental results reveal that different materials show different initial onset EL voltage and EL intensity, but they have the similar time-/phase-domain behaviors. All the light curves reveal the characteristic similar to the hysteresis of ferromagnetic material under stepped ac voltages. Moreover, it is found that the EL corresponding to different electrode materials and contact with sputtered gold film also displays the different critical voltage and light intensity. It is primarily considered that, the contact barrier between electrode and material and the space charges inside polymers greatly affect their EL characteristics.

关 键 词：电致发光 溅射电极 聚合物 复合 接触势垒 

分 类 号：TM85[电气工程—高电压与绝缘技术]