Screen Printing of Carbon Nanotubes for Field Emission Displays
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SCREEN PRINTING OF CARBON NANOTUBES FOR FIELD EMISSION DISPLAYS Mann Yi, Hyuck Jung, Woo-Suk Seo*, Jong-Won Park*, Hyun-Tae Chun*, Nam-Je Koh*, Soo-Deok Han*, and Dong-Gu Lee School of Advanced Materials & Systems Engineering, Kumoh National Institute of Technology, 188 Shinpyung-Dong, Gumi-City 730-701, Gyeongbuk, Korea. * Device Research Lab., LG.PHILIPS Displays, 184 Gongdan 1-Dong, Gumi-City 730-030, Gyeongbuk, Korea. ABSTRACT Carbon nanotubes (CNTs) have been significantly used for the field emitters for display applications. It is necessary to investigate the process variables affecting the screen printing of carbon nanotubes for the fabrication of good-quality field emitter devices with uniformity. Screen printing techniques have some advantages such as the short processing time and lower processing cost. The carbon nanotube pastes for screen printing are normally composed of organic binders, carbon nanotubes, and some additive materials. In this study, the carbon nanotube emitters for field emission displays were fabricated with different processing variables such as paste viscosity, paste composition, screen mesh, etc. The CNT pastes were printed on Cr-coated/Ag-printed soda-lime glass substrates. As a result, the processing variables were optimized for the good screen printing. From the I-V characteristics, the turn-on field of singlewalled nanotubes was lower than that of multi-walled nanotubes. The decrease in the mesh number of screen masks resulted in decreasing the turn-on field and increasing the electron emission current due to the higher density and vertical alignment of printed-CNTs. INTRODUCTION CNTs have a lot of advantages for electron emitters for the field emission display applications because they are chemically stable, inert, and rather insensitive to ion bombardment with large field-enhancement-factor due to their nano-sized diameter of carbon tubes [1-4]. In these days, a lot of efforts have been tried to fabricate field emission displays using carbon nanotubes as electron emitters [5-8]. There are two major processes in fabricating display devices using CNTs. One is the screen printing of CNT powders on glass substrates [5, 6, 9] and the other is the growing CNTs directly on substrates by thermal/plasma-enhanced CVD [7, 8]. The latter has some disadvantages such as high temperature process and expensive thin-film process. However, the former screen printing process has more competitiveness than thin film process because of its fast, easy, cost-effective, and large-area fabrication technique. It is well known that the screen printing technique has been already applied to the fabrication of the large-sized plasma display panels (PDP) [10]. Recently, some display industries have announced their prototypes, developing many types of CNT field emission displays by screen printing technique [5, 6]. In this study, some experiments were carried out to optimize a screen printing technique for field emission displays and to investigate processing variables affecting the printing such as th
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