Abstract
Carbon nanotube (CNT) emitters on buckypaper were activated by laser treatment andtheir field emission properties were investigated. The pristine buckypapers and CNTemitters’ height, diameter, and spacing were characterized through optical analysis. Theemitter spacing directly impacted the emission results when the laser power and treatmenttimes were fixed. The increasing emitter density increased the enhanced fieldemission current and luminance. However, a continuous and excessive increase ofemitter density with spacing reduction generated the screening effect. As a result,the extended screening effect from the smaller spacing eventually crippled thefield emission effectiveness. Luminance intensity and uniformity of field emissionsuggest that the highly effective buckypaper will have a density of 2500 emissionspots cm − 2, which presents an effective field enhancement factor of 3721 and a moderated screeningeffect of 0.005. Proper laser treatment is an effective post-treatment process for optimizingfield emission, luminance, and durability performance for buckypaper cold cathodes.
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