The creation spectra of intrinsic emission of a [formula omitted] crystal irradiated by ultraviolet photons

Abstract

The spectra of creation and excitation of the main emission bands of 3.7–3.8 eV and 3.0–3.1 eV at 15 K and 300 K were measured by vacuum-ultraviolet spectroscopy. The minimum creation energy of the primary luminescence 3.7–3.8 eV, is about 5 eV. Based on the measurement of the excitation spectrum of the emission band 3.7–3.8 eV, three sub-bands inside the valence band were detected. Emission of 3.7–3.8 eV is created by recombination of electrons in the conduction band with localized holes relaxed from three sub-bands above top of the valence band.