Although the low-threshold emission from polycrystalline diamond heavily doped with nitrogen has been proposed in our previous report, this is the first report on a practical diamond cold cathode, having pyramidal-shape array structure, promising for battery-driven flat panel displays. We have used urea [(NH3)2CO] as a dopant and grown diamond using hot filament chemical vapor deposition technique, and the mold-based technique is used in order to obtain the pyramidal-shape array structure. The obtained pyramids are identified as diamond from the results of Auger electron spectroscopy and Raman spectroscopy. The turn-on field as low as 0.2–0.3 V/μm and the remarkably high stability in the emission properties have been confirmed. In addition, the battery operation of the cathode has been demonstrated.
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Okano et al. (1997) studied this question.
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