INVESTIGATION OF THE CR3+ SITES IN SRLAGAO4 CRYSTAL

A single crystal of chromium doped SrLaGaO4 has been grown by the Czoc hralski method. The Cr3+ sites have been indentified on the basis of t ime-resolved luminescence spectra and luminescence decay curves record ed in the 5-300 K temperature region. One Cr3+ site in CrO6 octahedra distorted by random distribution of Sr2+ and La3+ ions over sites with C-4v symmetry is indicated by structural investigations. Instead, thr ee distinct sites of Cr3+ ions situated in the low, medium and high cr ystal field occur in the lattice of SrLaGaO4.