Abstract
We have reported the whisker-type cold emitter manufactured by an electrically conductive ZnO:Al whiskers with an extremely sharp tip and an a-CNx:H films as a field emitting material with a low work function. In this study, MgO polycrystalline film was investigated as a field emitting tip material. MgO has a comparatively large secondary electron emission and anti-sputtering characteristic. The field emission of 1.8 mA was obtained at the following conditions: a threshold voltage of 390 V and an applied voltage of 1.8 kV.
