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The effects of (Ba,Sr,Ca)CO3 or LaB6 addition on the x-ray photoelectron spectroscopy spectra and electrical properties of the MgO thin films in alternating current plasma display panels

Published online by Cambridge University Press:  31 January 2011

Sung Hwan Moon
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea; and Samsung SDI Corporate R&D Center, Gongse-dong, Kiheung-gu, Yongin-City, Gyenggi Province 446-577, Korea
Tae Wook Heo
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Sun Young Park
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Jae Hyuk Kim
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea; and Samsung SDI Corporate R&D Center, Gongse-dong, Kiheung-gu, Yongin-City, Gyenggi Province 446-577, Korea
Young Chul Choi
Affiliation:
Samsung SDI Corporate R&D Center, Gongse-dong, Kiheung-gu, Yongin-City, Gyenggi Province 446-577, Korea
Sung Il Ahn
Affiliation:
Department of Advanced Materials Engineering, Korea Polytechnic University, Shihung-si, Gyenggi Province 429-793, Korea
Joohwi Lee
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Hyeong Joon Kim*
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea; and Inter-University Semiconductor Research Center, Seoul National University, Seoul 151-744, Korea
*
a) Address all correspondence to this author. e-mail: hjkim@plaza.snu.ac.kr
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Abstract

MgO thin films are widely used in plasma display panels (PDPs) to protect the dielectric layer, which is composed of PbO2, B2O3, and SiO2 compound, against ion bombardment during discharge. To improve the electrical properties of the MgO thin films, (Ba,Sr,Ca)CO3 or LaB6, which has a lower work function than that of MgO, added to the MgO films. The effects of (Ba,Sr,Ca)CO3 or LaB6 addition on the electrical properties, microstructure, and electronic band structure were investigated. In the case where (Ba,Sr,Ca)CO3 was added, the firing voltage, which is the voltage when the panel is ignited the first time during increasing input voltage, was about 18.4 V lower than that of the conventional MgO films. In the case where LaB6 was added, the firing voltage was also reduced by about 24 V. The luminance and luminous efficiency were also increased. Of particular interest was the valence band spectra changed after adding (Ba,Sr,Ca)CO3 or LaB6. The valence band edge, which is the top of the valence band, was shifted to lower binding states and the width of the valence band was increased. Moreover, the band gap was slightly reduced. Considering the emission mechanism of MgO films in plasma display panels, these results mean that the secondary electrons can be ejected more easily and the ejected electrons have more energy. Therefore, the addition of (Ba,Sr,Ca)CO3 or LaB6 might improve the electrical properties.

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Copyright
Copyright © Materials Research Society 2007

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