Speaker
Description
The emission centers in YAG crystals grown in various conditions
S. Vasyukov 1, O. Sidletskiy 1, P. Arhipov 1, S. Tkachenko 1, A. Vedda 2, N. Shiran 1, V. Nesterkina 1
1 Institute for scintillation Materials NAS of Ukraine, 60 Nauka avenue, 61001 Kharkov, Ukraine
2 Department of Materials Science, University of Milano-Bicocca, Via Cozzi 53, 20125 Milan, Italy
The energy relaxation in the final stages of the scintillation process depends on the number of radiative and non-radiative relaxation centers, as also their properties. In many ways, the purity and quality of the crystals is crucial for minimizing energy losses at this stage. In the case of non-activated and doped YAG crystals, growing conditions and post-processing of the material are also important.
The work is aimed to research of YAG single crystals’ luminescence at different excitations in the wide temperature range (from 77 to 520 K) and various conditions.
The optical properties of YAG crystals grown according to the "classical scheme" - using Iridium crucibles and crystals obtained by the "modified scheme" - as crucibles used Molybdenum or Tungsten will be compared and discussed. It is shown that special treatment and other conditions allows to reach high quality of YAG crystals.
