Synthesis of Sm~(3+) and Dy~(3+) doped LaBWO_6 for evaluation as potential materials in luminescent display applications

摘要

A series of Sm~(3+) and Dy~(3+) doped LaBWO_6 phosphors were synthesized by high temperature solid state reaction. Recorded XRD patterns proved that the titled compound in a single phase has been obtained. Sm~(3+) and Dy~(3+) doped LaBWO_6 could emit orange and white light, respectively. The optimal doping concentration of Sm~(3+) or Dy~(3+) was experimentally ascertained to be 6 mol%. The critical distance of energy transfer for Sm~(3+) or Dy~(3+) doped sample is 1.540 nm. In addition, there is no cross energy transfer between the Sm~(3+) and Dy~(3+) ions in the co-doped samples. The results indicated that the electric dipole-dipole interaction is predominant energy transfer mechanism for concentration quenching of Sm~(3+) or Dy~(3+) doped LaBWO_6 phosphor. The charge transfer band was observed in the excitation spectra of Sm~(3+) or Dy~(3+) doped LaBWO_6 phosphors. Present investigation indicated that Sm~(3+) and Dy~(3+) doped LaBWO_6 can be applied in solid state lighting and LaBWO_6 is a promising host for display applications.