Field emission studies on well adhered pulsed laser deposited LaB6 on W tip

Abstract

Lanthanum hexaboride films have been deposited on a tungsten tip by pulsed laser deposition technique. The field emission studies have been performed in the conventional field emission geometry. The Fowler-Nordheim plot obtained from the current-voltage characteristic is found to be linear in accordance with the quantum mechanical tunneling phenomenon. A current density of 1.2×104A∕cm2 is drawn from the deposited tip. The field enhancement factor is calculated to be 5537cm−1, indicating that the field emission is from nanoscale protrusions present on emitter surface. The emission current-time plots show the very good stability of the emitter.

Field emission studies of pulsed laser deposited films on W and Re

“…Craciun et al have reported the synthesis of crystalline LaB 6 thin films on silicon substrates by PLD technique [18]. Recently we have reported FE studies on LaB 6 films deposited by PLD on a tungsten tip exhibiting striking features [12]. Here we report the synthesis of nanocrystalline LaB 6 thin films on tungsten and rhenium pointed and flat substrates by PLD and their FE studies.…”

Electrochemically Exfoliated Black Phosphorus Nanosheets – Prospective Field Emitters

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] For a given material, the FE performance can be improved by increasing the aspect ratio (lateral dimension/thickness), making arrays of material, or decorating the nano/micro structures with material having a lower work function. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] The field enhancement factor (β) depends upon the geometry of the emitter and the spatial distribution of the emitting centers. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]…”

Fabrication and emission properties of LaB 6 field emission microtriodes

“…A single tip of LaB 6 field emission cathode has been fabricated and showed excellent performance in our previous paper [10]. Late et al also have reported that LaB 6 deposited on a tungsten tip showed high current density and emission stability [9]. Djubua et al have deposited LaB 6 material on silicon field emission arrays [11], but didn't investigate the emission characteristics in detail.…”

“…It has been widely used as thermionic emitters, offering high brightness and long life [6]- [8]. On the other hand, LaB 6 is also excellent material for use as field emission cathodes due to the lower work function and excellent mechanical stability against ion bombardment [9]. In theory, LaB 6 -FEA can offer high emission current density, high emission stability and long life for use as cold cathodes.…”