Carbon-containing cathodes for enhanced electron emission

Details Carbon-containing cathodes for enhanced electron emission Carbon-containing cathodes for enhanced electron emission

1996-11-13

2000-07-18

Patel, Nimeshkumar D.

Electric lamp and discharge devices

Discharge devices having a thermionic or emissive cathode

313346R, 257 77, 257 11, 445 50, 445 51, H01J 130, H01J 1924

Patent

active

060911867

ABSTRACT:
A cathode has electropositive atoms directly bonded to a carbon-containing substrate. Preferably, the substrate comprises diamond or diamond-like (sp.sup.3) carbon, and the electropositive atoms are Cs. The cathode displays superior efficiency and durability. In one embodiment, the cathode has a negative electron affinity (NEA). The cathode can be used for field emission, thermionic emission, or photoemission. Upon exposure to air or oxygen, the cathode performance can be restored by annealing or other methods. Applications include detectors, electron multipliers, sensors, imaging systems, and displays, particularly flat panel displays.

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Fox, C. et al, Photoelectron emission from the cesiated diamond (110) surface, Mat. Res. Soc. Symp. Proc., vol. 416, pp. 449-545, 1996.
Mori, Y et al, Properties of metal/diamond interfaces and effects of oxygen adsorbed onto diamond surface, Appl. Phys. Lett., 58 (9), pp. 940-941, 1991.

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