Mechanisms for the creation of intrinsic electron-hole trapping centers in a CaSO4 crystall


Number 3_Vol.5

AUTHORS: T.N. Nurakhmetov, K.B. Zhangylyssov, A.M. Zhunusbekov, D.H. Daurenbekov, T.T. Alibay, B.M. Sadykova, B.N. Yussupbekova, D.A. Tolekov

DOI: 10.32523/ejpfm.2021050308

PAGES: 235 - 241

DATE: 2021-09-22


ABSTRACT

The mechanism of creation of electron-hole trapping centers in CaSO4 at 15-300 K was investigated by the methods of vacuum-ultraviolet and thermoactivation spectroscopy. It is shown that electron-hole trapping centers are formed upon trap of electrons in the anionic complexes SO4 and localization of holes in the form of SO4 radical. Based on the measurement of the spectrum of excitation of long-wavelength recombination emission at 3.0-3.1 eV and 2.7 eV, the energy distance of the formed electron-hole trapping centers was estimated (4.43 eV and 3.87 eV).


KEYWORDS

electron, hole, trap centers, sulfates, crystals, luminescence


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