Field emission devices employing enhanced diamond field emitters

Details Field emission devices employing enhanced diamond field emitters Field emission devices employing enhanced diamond field emitters

1994-10-31

1997-06-10

Oberley, Alvin E.

Electric lamp and discharge devices

Discharge devices having a thermionic or emissive cathode

313309, 313311, H01J 130

Patent

active

056379501

ABSTRACT:
Applicants have discovered methods for making, treating and using diamonds which substantially enhance their capability for low voltage emission. Specifically, applicants have discovered that defect-rich diamonds--diamonds grown or treated to increase the concentration of defects--have enhanced properties of low voltage emission. Defect-rich diamonds are characterized in Raman spectroscopy by a diamond peak at 1332 cm.sup.-1 broadened by a full width at half maximum .DELTA.K in the range 5-15 cm.sup.-1 (and preferably 7-11 cm.sup.-1). Such defect-rich diamonds can emit electron current densities of 0.1 mA/mm.sup.2 or more at a low applied field of 25 V/.mu.m or less. Particularly advantageous structures use such diamonds in an array of islands or particles each less than 10 .mu.m in diameter at fields of 15 V/.mu.m or less.

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