Formation of extremely high current density LaB6 field emission arrays via e-beam deposition

Qi, K. C.; Lin, Z. L.; Chen, W. B.; Cao, G. C.; Cheng, J. B.; Sun, X. W.
September 2008
Applied Physics Letters;9/1/2008, Vol. 93 Issue 9, p093503
Academic Journal
In this paper, we report a Spindt-type field emission array (FEA) with LaB6 as the emitting material. The LaB6 emitters were deposited by e-beam evaporation with low oxide content. As LaB6 in its vapor form is active and absorbs large quantity of residual gases, which oxidizes the LaB6 films, a special e-beam configuration was designed to ensure high evaporation rate which is essential for depositing pure phase LaB6. FEAs with LaB6 emitter tips exhibited an average emission current as high as about 0.23 μA/tip suggesting that LaB6 emitters are promising candidates for high current density vacuum electronic devices.


Related Articles

  • Carbon velvet field-emission cathode. Shiffler, D.; Ruebush, M.; Haworth, M.; Umstattd, R.; LaCour, M.; Golby, K.; Zagar, D.; Knowles, T. // Review of Scientific Instruments;Dec2002, Vol. 73 Issue 12, p4358 

    Explosive field emission cathodes comprise an important class of cathodes for high power microwave tubes, having the advantages of light weight as well as requiring no heater for electron emission. Generally, however, this class of cathodes suffers from large amounts of outgassing, nonuniform...

  • Influence of vacuum on nano-diamond cathode field emission characteristics. Yanning Yang; Zhiyong Zhang; Weixia Li; Chunxue Zhai; Qiaoping Liu; Fuchun Zhang // Applied Mechanics & Materials;2014, Issue 633-634, p21 

    The test of nano-diamond cathode field emission characteristics was conducted by changing the vacuum, the influence of vacuum change on nano-diamond field emission characteristics was also explored. It was found that under the condition of low vacuum, nano-diamond field emission turn-on field is...

  • Hybrid thermal-field emission of ZnO nanowires. Ulisse, Giacomo; Brunetti, Francesca; Vomiero, Alberto; Natile, Marta M.; Sberveglieri, Giorgio; Di Carlo, Aldo // Applied Physics Letters;12/12/2011, Vol. 99 Issue 24, p243108 

    The electron emission properties of an array of ZnO nanowires were studied in the temperature range of 300-473 K. An almost doubling of the current density at 473 K under an electric field of 8 V/μm (j(T=473 K) = 190 μA/cm2, j(T=300 K) = 114 μA/cm2) was observed together with a...

  • Cold-cathode vacuum tube. Scrupski, Steve // Electronic Design;03/08/99, Vol. 47 Issue 5, p62 

    Comments on the applications of cold-cathode vacuum tube. Includes flat-screen television tubes, satellite vehicles, radios, electron guns, kinescopes; Flow of the electron emission in a magnesium oxide (MgO) layer; Influence of high electric field on electrons from the MgO layer; Function of...

  • Influence ofsp 3 fraction on the field emission properties of tetrahedral amorphous carbon films formed by magnetic filtered plasma stream. Chen, D.H.; Li, Z.Y.; Wei, A.X. // Applied Physics A: Materials Science & Processing;Apr2005, Vol. 80 Issue 7, p1573 

    Electron field emission properties of tetrahedral amorphous carbon films (ta-C) with various sp3 fractions, [sp3]/([sp2]+[sp3]), prepared by magnetic filtered plasma deposition system, were investigated. The ta-C films were deposited on (100) n-Si wafer with a resistivity of 0.01-0.02 O?cm in a...

  • The effect of plasma density and emitter geometry on space charge limits for field emitter array electron charge emission into a space plasma. Morris, Dave; Gilchrist, Brian; Gallimore, Alec // AIP Conference Proceedings;2001, Vol. 552 Issue 1, p467 

    Field Emitter Array Cathodes (FEACs) are a new technology being developed for several potential spacecraft electron emission and charge control applications. Instead of a single hot (i.e. high powered) emitter, or a gas dependant plasma contactor, FEAC systems consist of many (hundreds or...

  • The 'nanotriode:' A nanoscale field-emission tube. Driskill-Smith, A.A.G.; Hasko, D.G.; Ahmed, H. // Applied Physics Letters;11/1/1999, Vol. 75 Issue 18, p2845 

    Characterizes a nanoscale electron tube with a field-emission cathode and a control gate. Emission of electrons from metal nanopillars; Radii of electrons; Vertical and horizontal dimensions of the nanochamber; Level of the turn-on voltage; Transconductance yield; Emission stability at room...

  • Triple-biprism electron interferometry. Harada, Ken; Matsuda, Tsuyoshi; Tonomura, Akira; Akashi, Tetsuya; Togawa, Yoshihiko // Journal of Applied Physics;6/1/2006, Vol. 99 Issue 11, p113502 

    Triple-biprism electron interferometry has been developed to flexibly control all interference parameters, i.e., interference region (size and shape), fringe spacing, and fringe angle. Each filament electrode of the upper and middle electron biprisms is installed in the individual image planes...

  • Comparison of CsBr and KBr covered Cu photocathodes: Effects of laser irradiation and work function changes. He, Weidong; Vilayurganapathy, Subramanian; Joly, Alan G.; Droubay, Tim C.; Chambers, Scott A.; Maldonado, Juan R.; Hess, Wayne P. // Applied Physics Letters;2/18/2013, Vol. 102 Issue 7, p071604 

    Thin films of CsBr and KBr were deposited on Cu(100) to investigate photoemission properties of these potential photocathode materials. After prolonged laser ultraviolet irradiation photoemission, quantum efficiency increases by factors of 26 and 77 for KBr/Cu(100) and CsBr/Cu(100)...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics