Application of Highly Ordered Carbon Nanotubes Templates to Field-Emission Organic Light Emitting Diodes
نویسندگان
چکیده
An anodic aluminum oxide (AAO) template was formed by a two-step anodization process. Carbon nanotubes (CNTs) were successfully synthesized along with AAO pores and the diameters of CNTs equaled those of AAO pores. The lengths of CNTs during a chemical vapor deposition synthesized process on the AAO template were effectively controlled. These AAO-CNTs exhibit excellent field emission with a low turn-on field (0.7 V/μm) and a low threshold field (1.4 V/μm). The field enhancement factor, calculated from the non-saturated region of the Fowler-Nordheim (F-N) plot, is about 8237. A novel field-emission organic light emitting diode (FEOLED) combining AAO-CNTs cathodes as electron source with organic electroluminescent (EL) light emitting layers coated on indium tin oxide (ITO) is produced. The uniform and dense luminescence image is obtained in the FEOLEDs. Organic EL light emitting materials have lower working voltage than inorganic phosphor-coated fluorescent screens.
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