Electron emission properties of carbon nanotube field emitter arrays (CNT F
EAs) having carbon nanotube emitters on the top of Si emitters were investi
gated under the ultrahigh-vacuum (UHV) condition. The emission pattern from
the CNT FEAs was confirmed on a phosphor screen. The emission current foll
owed the Fowler-Nordheim relationship under the high emission current condi
tion. With the emission current of 0.5 mA, the fluctuation of the emission
current was 3% or lower at the background pressure of similar to 10(-7) Pa.