Electric lamp and discharge devices – Discharge devices having an electrode of particular material
Patent
1998-05-06
2000-11-07
Patel, Ashok
Electric lamp and discharge devices
Discharge devices having an electrode of particular material
313336, 313351, 313309, H01J 130
Patent
active
061441457
ABSTRACT:
A high performance novel electron emitter material for use in field emission devices is disclosed. The high performance electron emitter material of the invention may comprise a high Cr and SiO mixture. This material may be formed into high aspect ratio, low work function tips which maintain their shape, thus minimizing flash over risks and electron scattering problems, while at the same time permitting a high level of fabrication process flexibility, and minimizing film stresses. One or more impurities which are conductive oxides or will form conductive oxides may be added to the Cr--SiO composition so that a net low work function emitter may be maintained under oxidation. A class of semi-conductive and conductive metal oxides comprises another embodiment of the invention. These materials include oxides of Cr, Mo, Ni, Fe, and Sc, which have current emitting properties desirable for applications where improved electron emission infirmity is desired among emitters within a pixel. Emission from these more resistive emitter tip materials may be optionally enhanced with the addition of low work function impurities such as alkali metals enabling more stable devices while still permitting low turn-on voltages. Methods of making the emitter are also disclosed.
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Jones Gary W.
Zimmerman Steven M.
eMagin Corporation
Patel Ashok
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