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http://dx.doi.org/10.4191/KCERS.2006.43.3.177

Nanostructure of Optical Materials Doped with Rare-Earths: X-Ray Absorption Spectroscopy of Dy-Doped Ge-As-S Glass  

Choi, Yong-Gyu (Department of Materials Science and Engineering, Hankuk Aviation University)
Song, Jay-Hyok (Center for Information Materials and Department of Materials Science and Engineering, Pohang University of Science and Technology)
Shin, Yong-Beom (Bio-Nanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology)
Chernov, Vladimir A. (Siberian Synchrotron Radiation Center, Budker Institute of Nuclear Physics)
Heo, Jong (Center for Information Materials and Department of Materials Science and Engineering, Pohang University of Science and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.43, no.3, 2006 , pp. 177-184 More about this Journal
Abstract
Dy $L_3$-edge XANES and EXAFS spectra of chalcogenide Ge-As-S glass doped with ca. 0.2 wt% dysprosium have been investigated along with some reference Dy-containing crystals. Amplitude of the white-line peak in XANES spectrum of the glass sample turns out to be stronger than that of other reference crystals, i.e., $DY_2S_3,\;Dy_2O_3\;and\;DyBr_3$. It has been verified from the Dy $L_3$-edge EXAFS spectra that a central Dy atom is surrounded by $6.7{\pm}0.5$ sulfur atoms in its first coordination shell in the Ge-As-S glass, which is relatively smaller than 7.5 of the $Dy_2S_3$ crystal. Averaged Dy-S inter-atomic-distance of the glass ($2.78{\pm}0.01{\AA}$) also turns out to be somewhat shorter than that of the $Dy_2S_3$ crystal ($2.82{\pm}0.01{\AA}$). Such nanostructural changes occurring at Dy atoms imply there being stronger covalency of Dy-S chemical bonds in the Ge-As-S glass than in the crystal counterpart. The enhanced covalency in the nanostructural environment of $Dy^{3+}$ ions inside the glass would then be responsible for optical characteristics of the $4f{\leftrightarrow}4f$ transitions of the dopants, i.e., increase of oscillator strengths and spontaneous radiative transition probabilities.
Keywords
Nanostructure; Dysprosium; Sulfide glasses; Ge-As-S glasses; EXAFS; XANES;
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