Some observations on the photoluminescence of doped β-galliumsesquioxide

The luminescence of single crystalline and powder specimens of β-Ga2O3 has been studied in the temperature range 5–300°K. The investigations were carried out on nominally pure samples and samples doped with various cations. In addition to the intrinsic uv emission a blue and a green emission occurred. On the basis of luminescence and electronic conductivity data the blue emission is ascribed to the recombination of an electron in a V×o or Ga×i center and a hole trapped in a gallium ion vacancy. The data on the green luminescence do not permit any definitive conclusions to be drawn regarding the nature of this emission.