On the luminescence of the Sb3+ion in Cs2NaMBr6(M=Sc,Y,La)

The luminescence spectra and decay curves of Sb 3+ -doped Cs 2 NaMBr 6 (M=Sc,Y,La) are presented. In this lattice the Sb 3+ ion (5s 2 ) is octahedrally surrounded by six bromide ions. The emission consists of one band. The Stokes shift increases in going from Sc to La. This is connected to the larger space available for the Sb 3+ ion in the same sequence. The excitation spectra can be interpreted by assuming a dynamical Jahn-Teller effect to be operative in the excited state of the Sb 3+ ion. The results are compared with those for Sb 3+ in Cs 2 NaMCl 6 and for monovalent s 2 ions in alkali bromides.