The lighting performances and phosphor degradation in field emission lamps (FELs) with two different kinds of cathode materialsââ?¬â?\nmultiwalled carbon nanotubes (MWCNTs) and carbon nanocoils (CNCs)ââ?¬â?were compared. The MWCNTs and CNCs were\nselectively synthesized on 304 stainless steel wire substrates dip-coated with nanosized Pd catalysts by controlling the growth\ntemperature in thermal chemical vapor deposition, and the film uniformity can be optimized by adjusting the growth time. FELs\nwere successfully fabricated by assembling these cathode filaments with a glass bulb-type anode. The FEL with the CNC cathode\nshowed much higher lighting uniformity and light-spot density and a lower current at the same voltage than that with the MWCNT\ncathode filament, and its best luminous efficiency was as high as 75 lm/W at 8 kV. We also found that, for P22, the phosphor\ndegradation can be effectively suppressed by replacing MWCNTs with CNCs in the cathode, due to the much larger total bright\nspot area and hence much lower current density loading on the anode.
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