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

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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.