Power consumption
reduction and energy savings for field-emission (FE) electron sources
for the loading of high current output, long durability, and high
power are considerably challenging in the field of materials. Here
we show a new approach using a simple structure comprising highly
crystalline single-walled carbon nanotubes (SWCNTs) in the cathode
for meeting these goals of power consumption and energy efficiency.
Efficacy and applicability were successfully demonstrated by revealing
the ideal FE properties of SWCNTs via the control of their crystallinity.
The FE fluctuation and emission lifetime of highly crystalline SWCNTs
exhibited good stability for greater than 1300 h at 30 mA/cm2 and durability with an FE high current density of 10 A/cm2 via the application of a direct current constant voltage in the
cathodic planar field emitter. Moreover, field emitters using highly
crystalline SWCNTs permitted the use of new vacuum power switches
for the loading power operation of greater than 27 kW, with a high
loading current without energy loss and a cooling system. Highly crystalline
SWCNTs as a flat plane-emission device can serve as a technological
breakthrough for realizing energy savings and a low-carbon society
in daily life.
We developed and successfully fabricated a plannar light source device using a phosphor screen with single-walled carbon nanotubes (SWCNTs) as field emitters in a simple diode structure composed of the cathode containing the highly purified and crystalline SWCNTs dispersed into an organic In2O3-SnO2 precursor solution and a non-ionic surfactant. The cathode was activated by scratching process with sandpaper to obtain a large field emission current with low power consumption. The nicks by scratching were treated with Fourier analysis to determine the periodicity of the surface morphology and designed with controlling the count number of sandpapers. The anode, on the other hand, was made with phosphor deliberately optimized by coverage of ITO nanoparticles and assembled together with the cathode by the new stable assembling process resulting to stand-alone flat plane-emission panel. The device in a diode structure has a low driving voltage and good brightness homogeneity in that plane. Furthermore, field emission current fluctuation, which is an important factor in comparing luminance devices too, has a good stability in a simple diode panel. The flat plane-emission device employing the highly purified and crystalline SWCNTs has the potential to provide a new approach to lighting in our life style.
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