Two-Electron Transitions in the Luminescence of Excitons Bound to Neutral Donors in Gallium Phosphide

Abstract

We describe spectra in which excitons bound to neutral donors in gallium phosphide decay radiatively leaving the donor in an excited state. These two-electron transitions provide a convenient way of studying the donor energy levels and, together with the results of donor-acceptor pair spectra, have given many donor and acceptor binding energies in gallium phosphide.