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J. Korean Ceram. Soc. > Volume 43(3); 2006 > Article
Journal of the Korean Ceramic Society 2006;43(3): 177.
doi: https://doi.org/10.4191/kcers.2006.43.3.177
희토류 첨가 광소재의 나노구조 : Dy 첨가 Ge-As-S 유리의 X-선 흡수 스펙트럼 분석
최용규, 송재혁1, 신용범2, Vladimir A. Chernov3, 허종1
한국항공대학교 항공재료공학과
1포항공과대학교 정보신소재연구소 및 신소재공학과
2한국생명공학연구원 바이오나노연구센터
Nanostructure of Optical Materials Doped with Rare-Earths: X-Ray Absorption Spectroscopy of Dy-Doped Ge-As-S Glass
Yong-Gyu Choi, Jay-Hyok Song1, Yong-Beom Shin2, Vladimir A. Chernov3, Jong Heo1
Department of Materials Science and Engineering, Hankuk Aviation University
1Center for Information Materials and Department of Materials Science and Engineering, Pohang University of Science and Technology
2Bio-Nanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology
3Siberian Synchrotron Radiation Center, Budker Institute of Nuclear Physics
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.
Key words: Nanostructure, Dysprosium, Sulfide glasses, Ge-As-S glasses, EXAFS, XANES
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