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

희토류 첨가 광소재의 나노구조 : Dy 첨가 Ge-As-S 유리의 X-선 흡수 스펙트럼 분석

  • 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)
  • 최용규 (한국항공대학교 항공재료공학과) ;
  • 송재혁 (포항공과대학교 정보신소재연구소 및 신소재공학과) ;
  • 신용범 (한국생명공학연구원 바이오나노연구센터) ;
  • ;
  • 허종 (포항공과대학교 정보신소재연구소 및 신소재공학과)
  • Published : 2006.03.01

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

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