Articles
  • Concentration Quenching of Tb3+ Luminescence in TbxYb3-XAl5O12 Single Crystals 
  • M. Nikl*, N. Solovieva, M. Dusek, A. Yoshikawaa, Yuji Kagamitanib and T. Fukudaa,b
  • Institute of Physics AS CR, Prague, Czech Republic a Institute of Multidisciplinary Research for Advanced Materials,Tohoku University, Sendai 980-8577, Japan b Fukuda X'tal Laboratory, 6-6-3 Minamiyoshinari, Aoba-ku, Sendai 989-3204, Japan
Abstract
Tb-doped Yb3Al5O12 and Y3Al5O12 single crystals were grown by the micropulling-down method in the form of rods of 2 mm diameter and a few cm in length. Emission spectra and decay times of Tb3+ luminescent centers were measured for Tb concentrations in a Y(Yb) sublattice of (1-70) %. A noticeable decrease of the emission intensity and decay time was obtained for Tb concentrations above 15% and 30% for Y3Al5O12 and Yb3Al5O12 hosts, respectively. Both effects are ascribed to the concentration quenching of Tb3+ luminescence due to energy migration over the Tb3+ subsystem and subsequent energy transfer to unspecified nonradiative traps. Energy migration process and structural aspects are discussed.

Keywords: micropulling-down crystal growth, luminescence, rare earth ions, concentration quenching

This Article

  • 2003; 4(3): 112-114

    Published on Sep 30, 2003