Intrinsic and impurity emission and formation mechanism of trapping centers in LiKSO4-Cu crystals

Abstract

Using the methods of vacuum ultraviolet spectroscopy and thermally stimulated luminescence, the nature of intrinsic and impurity luminescence and the formation of electron-hole trap centers are studied. LiKSO4-Cu crystal were excited by photons of 4–12 eV and X-rays in the temperature range 15–300 K. The energy transfer by intrinsic electronic excitations to impurity Cu+ luminescence centers was demonstrated. The nature of radiation-induced emissions was studied at the temperatures of 15–80 K. The band gap of the LiKSO4 crystal (about 5.64 eV) was estimated on the basis of the efficiency of energy transfer by electron-hole pairs to luminescent impurity centers.