Abstract
The nature of intrinsic emission and the mechanisms of creation of electron-hole trapping centers in Na2SO4 in a wide temperature range of 15–300 K under irradiation with photons in the energy range of 4÷12.5 eV have been investigated by the methods of vacuum-ultraviolet and thermoactivation spectroscopy. Crystals of Na2SO4 were grown from a saturated aqueous solution by the method of slow evaporation. The results of XRD showed the crystalline structure of the prepared material. It is shown that intrinsic emission appears during the recombination of electrons from the s state of the conduction band with nonequivalently spaced holes SO4−. Electronic transitions from the orbital of the valence band to the conduction band have been identified. For the first time, the band gap was experimentally estimated within 4.9–5.1 eV, and the energy of intracenter electronic transitions at the created electron-hole trapping centers was also estimated.
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