Luminescence and Electron–Hole-Trapping Centers in α-Ca2P2O7−Mn
Nurakhmetov T.N. Alibay T.T. Zhangylyssov K.B. Nurpeissov A.S. Pazylbek S. Griesiute D. Zarkov A. Kareiva A.
May 2024Multidisciplinary Digital Publishing Institute (MDPI)
Crystals
2024#14Issue 5
The mechanisms of formation of induced intrinsic and impurity radiative states, which consist of intrinsic and impurity electron–hole-trapping center states in irradiated (Formula presented.) and (Formula presented.) phosphates, were investigated using thermoactivation and vacuum-ultraviolet spectroscopy methods. These centers are excited at photon energies of 4.0 eV and 4.5 eV, which are within the matrix’s transparency region. New radiative-induced states at 3.06 eV and 2.92 eV are demonstrated to be generated upon the excitation of anions by photons with energies of 5.0 and 5.64 eV. This process is due to charge transfer from the ion to the impurities, specifically (Formula presented.) and the neighboring ion (Formula presented.). Furthermore, upon the excitation of matrix anions with photon energies exceeding the band gap (8.0–8.25 eV), electron-trapping by impurities such as (Formula presented.) and (Formula presented.) ions results.
electrons and holes , emission spectra , excitation spectra , luminescence , SEM , trapping center , XRD
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L.N. Gumilyov Eurasian National University, st. Satpaev-2, Astana, Z01A3D7, Kazakhstan
Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, Vilnius, LT-03225, Lithuania
L.N. Gumilyov Eurasian National University
Institute of Chemistry
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