Articles
  • Thermal and optical properties of Yb-doped Lu2O3 single crystal grown by the micro-pulling-down method 
  • J. H. Muna,*, A. Jouinib, A. Yoshikawac, J. H. Kima, T. Fukudac and J. S. Leed
  • a Gyeongbuk Hybrid Technology Institute, 36 Goeyeon-Dong, Yeongcheon, Gyeongbuk 770-170, Korea b Physical Chemistry of Luminescent Materials, UMR 5620 CNRS, Claude Bernard /Lyon1 University, Villeurbanne 69622, France c Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan d Department of Advanced Materials Engineering, Kyungsung University, Busan 608-736, Korea
Abstract
Undoped and (0, 0.5, 5 mol%) Lu2O3 single crystals were grown by the micro-pulling-down method. Crystals were transparent with yellowish color with 4.2 mm in diameter and 6-9 mm in length. Yb-doped Lu2O3 single crystals have a good compositional homogeneity along the growth axis. Both, thermal diffusivity and heat capacity decrease when the Yb concentration increase. As a result, the calculated thermal conductivity for 5 mol% Yb3+-doped Lu2O3 decreases from 14.32 to 12.42 Wm(-1)K(-1). We have also investigated the absorption, fluorescence spectra and measured fluorescence lifetimes as a function of the Yb content.

Keywords: Yb3+ activator; Thermal conductivity; Micro-pulling-down method; Crystal growth from the melt; Rere-earth sesquioxides

This Article

  • 2013; 14(5): 636-640

    Published on Oct 31, 2013