Photo-stimulated luminescence in SrAl2O4 : Eu2+,Dy3+ single crystal fibers

In order to understand the phosphorescence dynamics, a photo-pulse stimulat ion technique was used to release the stored photo-energy from trapped Eu2 ions in SrAl2O4:Eu,Dy single crystal fibers at 80 K. It was found that the lifetime of the photo-stimulated luminescence from trapped Eu2+ ions is 10 8 ns, 3 times faster than that of the normal luminescence. The fast decay c an be caused by retrapping or lattice relaxation. Thermoluminescence result s indicate that the retrapping process is negligible. Lattice relaxation mi ght be the physical reason to accelerate the decay process through multiple phonon processes. (C) 1999 Published by Elsevier Science B.V. All rights r eserved.