增强碳纳米管场发射性能的沟槽形冷阴极制作(英文)

Fabrication of Groove Shape Cold Cathode for Enhancing Field Emission Properties of Carbon Nanotube

基于烧结工艺和丝网印刷技术,研发了一种新的沟槽形冷阴极.底部绝缘层由黑色绝缘浆料被烧结后制成,且在底部绝缘层中存在倾斜面.将银浆丝网印刷在条形电极上,依次经烘烤和烧结工艺后形成银电极.利用细砂纸,对银电极进行适当的抛光工艺,以便获得光滑的电极表面.由于特有的银电极形状,从而易于获得更大的场增强因子.将碳纳米管制备在银电极上,形成场发射极.致密的碳纳米管层完全覆盖银电极表面,特有的边缘场增强效应能够使得碳纳米管发射出更多的电子.顶部绝缘层则用于抑制碳纳米管的横向电子发射.结合沟槽形冷阴极,制作了三极结构的场致发射显示器,该显示器具有良好的场致发射特性及优良的发光图像均匀性.与普通冷阴极场致发射显示器相比,沟槽形冷阴极场致发射显示器能够将开启电场从1.86V/μm降低到1.78V/μm,将最大场致发射电流从1 537μA增加到2 863μA,且将最大发光图像亮度从1 386cd/m2提高到1 865cd/m2.该制作技术在场致发射显示器中具有较强的实际应用性.

Based on sintering process and screen printing technique,a novel groove shape cold cathode was developed.The black insulation slurry was sintered to fabricate the bottom insulation layer,in which a gradient surface existed.The silver slurry was screen-printed on the bar electrode. With the baking and sintering process in proper sequence,the silver electrode was formed.Using fine sandpaper,aproper polishing process for silver electrode was conducted,so a smooth electrode surface was obtained.Due to the special silver electrode shape,a larger field enhancement factor was achieved easily.Carbon nanotubes were prepared on the silver electrode to form the field emitters. The dense carbon nanotube layer would cover the silver electrode surface completely.Owing to the special edge field enhancing effect,lots of electrons would be emitted from the carbon nanotube.The top insulation layer was used to restrain the side electron emission of carbon nanotube.With the groove shape cold cathode,a triode field emission display was fabricated,which exhibited good field emission properties and better luminescence image uniformity.Comparing with the common cold cathode field emission display,the turn-on electric field could be reduced from 1.86 V/μm to1.78V/μm,the maximum field emission current had been increased from 1 537μA to 2 863μA,and the maximum luminescence image brightness would be enhanced from 1 386cd/m2 to 1 865cd/m2.The developed fabrication technology had a potential practical application in field emission display.