生长温度对纳米氧化锌场发射性能的影响

采用锌粉和银粉为蒸发源,用热蒸发法不同温度下制备了四针状纳米氧化锌,并以单独的锌粉做对照。采用扫描电子显微镜(SEM)观察其形貌,X射线衍射(XRD)谱表征其晶体结构。采用丝网印刷方法将其制备为场致电子发射阴极,将阴极与印刷有荧光粉的阳极板组装成二极结构场致发射显示屏,并进行了场致电子发射特性对比实验。结果表明较高温度制备的氧化锌具有较好的场致发射性能;掺杂银粉的蒸发源制备的样品的发射性能明显优于没有掺杂银粉的样品。实验证明ZnO是一种优良的场致发射冷阴极材料,在真空电子方面具有广阔的应用前景。

Effects of Synthesizing Temperature on the Field Emission Properties of Nano- Zinc Oxide

The nano-zinc oxides (ZnO) synthesized by thermal evaporation of zinc powder with silver powder at different temperature and zinc powder only were compared. Scanning electron microscopy (SEM) was applied to study the morphologies and X-ray diffraction (XRD) was exerted to characterize the crystal structure. The field emission cathode was fabricated with a simple screen printing method. We packed the cathode panel and the anode panel printed with phosphor power as a field emission display with diode structure for the contrastive field emission experiment. The results show that the higher synthesizing temperature of the sample, the better field emission; the sample synthesized by the evaporation source including zinc powder and silver powder shows better field emission than that for the single source only including zinc powder. It's shown from the experimental results that nano-ZnO semiconductor material is a good candidate for a field emission cathode and has potential application in vacuum electronics.