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KMID : 1059519990430060636
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Journal of the Korean Chemical Society
1999 Volume.43 No. 6 p.636 ~ p.643
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Mn K-Edge XAS Analyese of Zn(2-X)MnX SiO4 Phosphors
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Choi Yong-Gyu
Lim Dong-Sung
Kim Kyong-Hon
Sohn Kee-Sun
Park Hee-Dong
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Abstract
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Green-emission intensity of a Zn2-xMnxSi04 phosphor, which is a potential candidate as a green component in PDP device, significantly increases provided that the compound is additionally heat treated at 900℃ after solid state reaction at 1300℃, In order to verify origin of such an intensity enhancement after the additional heat treatment in association with the electronic and local structural change at around Mn ions, the Mn K-edge X-ray absorption spectra were recorded. From the analyses of the preedge peak corresponding to 1s →3d bound state transition and XANES spectrum, it is known that most Mn ions are in +2 oxidation state and substitute Zn ion site regardless of the thermal treatment, In addition, EXAFS analyses revealed that Mn ions formed Mn04 tetrahedral with the Mn-O bond length shortened by 0.01Å and with reduced Debye-Wailer factor in the thermally treated sample.
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KEYWORD
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