Activation Process-Dependent Characteristics of Novel Thermionic Oxide Cathodes for CRT Application

HASHIM, A. A., BARRATT, D. S., HASSAN, A. K. and NABOK, A. V. (2006). Activation Process-Dependent Characteristics of Novel Thermionic Oxide Cathodes for CRT Application. Journal of display technology, 2 (1), 91-97.

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The emission and conductivity characteristics of oxide cathodes depend largely on the activation process. In this paper, the electrical properties of new type of oxide cathodes for cathode ray tube (CRT) application, supplied by LG Philips Displays, have been investigated in relation to different cathode activation regimes. The influence of the activation process over different durations has been investigated. A temperature of T = 1425 K was chosen to be higher than the optimum cathode activation temperature (T = 1200 K), and the other temperature of T = 1125 K was lower than that. The electron activation energy (E) was found to vary in the range from 0.58 to 2.28 eV for cathodes activated at the higher temperature regime, and from 1.08 to 1.9 eV for those activated at the lower temperature regime. Scanning electron microscopy (SEM) and electron diffraction X-ray (EDX) analyses show a structural phase transformation in the oxide material that was activated at 1125 K for a period of 1-12 hours. The SEM mapping shows a large contamination of Ba in the top layer of oxide material. The activator agents tungsten and aluminum are found to penetrate into the BaO\SrO layer in two different ways.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Electronic Materials and Sensors Research Group
Identification Number:
Page Range: 91-97
Depositing User: Ann Betterton
Date Deposited: 20 Apr 2010 10:58
Last Modified: 18 Mar 2021 09:45

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