Abstract
The authors investigated the field-electron emission characteristics of a planar field-emission (FE) electron source with a planar conductive layer as a gate electrode embedded under a cathode composed of highly crystalline single-walled carbon nanotubes (hc-SWCNTs) as an emitter. They designed a flat-panel electron emission device that could control electron emission switching arbitrarily, and the device stably emitted electrons on the flat panel. After they assembled the FE electronic device using a wet chemical process, they attained low power consumption and high luminance efficiency. These results show that the application of hc-SWCNTs effectively conserves energy in FE electron sources. The fabrication of FE electron sources and other devices with ultralow power consumption, along with applications that utilize such devices, is expected in the future.
Highlights
Carbon nanotubes (CNTs) have one-dimensional shapes and have attracted considerable attention
These results show that the application of hc-Single-walled CNTs (SWCNTs) effectively conserves energy in FE electron sources
We believe that our findings provide useful guidelines for the effective use of hc-Single-walled CNTs (SWCNTs) in electronic devices and that our design will promote the practical implementation of the planar FE electron source
Summary
Carbon nanotubes (CNTs) have one-dimensional shapes and have attracted considerable attention. The cathode we developed emitted many FE electrons (FE current) in lowvoltage applications because of the high crystallinity of the SWCNTs that were used as the FE electron source with a gate electrode over the cathode in the triode structure.. We have been comparing the effectiveness of two triode structures with a gate electrode layer over or under the emission layer for controlling the current density under a planar electron source containing hc-SWCNTs as field emitters with low power consumption. In the study reported here, we developed an optimized design for an electrode structure that requires a low driving voltage and electron emission on-and-off controls for a cathode to measure the emission current density from the electron emission source by using a cathodoluminescence structure
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