Stacking Faults Induced Luminescence In A Quasi One-Dimensional Material

The existence of Br22- pseudomolecules has been pointed out in the quasi one dimensional material CsCdBr3 and such centers have been observed for the first time at the ground state and at room temperature. The electronic and molecular orbitals involved in the optical transitions have been respectively identified by the Nishimura model and by two-photon excitation experiments. The origin of these centers has been related to stacking faults located at the interfaces of the cubic microdomains of CsMBr3 (M=Pb or Sn) by the studies of the doping effect by Pb2+ or Sn2+ and thermal treatments on the concentration of the centers Br22-.