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Concentration Quenching of Tb3+ Luminescence in TbxYb3-XAl5O12 Single Crystals
M.Nikl,N.Solovieva,A.Yoshikawa,YujiKagamitani,T.Fukuda 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.3
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.