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Carbon-containing cathodes for enhanced electron emission

United States Patent

July 18, 2000
View the Complete Patent at the US Patent & Trademark Office
SLAC National Accelerator Laboratory - Visit the Technology Transfer Website
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.
Cao; Renyu (Cupertino, CA), Pan; Lawrence (Pleasanton, CA), Vergara; German (Madrid, ES), Fox; Ciaran (Los Altos, CA)
The Board of Trustees of the Leland Stanford Junior University (Palo Alto, CA), Sandia National Laboratories (Livermore, CA)
08/ 748,690
November 13, 1996
This invention was made with government support under Contract Nos. DE-AC03-76SF00515 and DE-AC04-94AL85000, awarded by the Department of Energy. The U.S. government has certain rights in this invention.