Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Luminescence and Electron-hole Trapping Centers in Mn-doped α-Ca2P2O7

Turlybek Nurakhmetov
,
Temirulan Alibay
ORCID logo ,
Keleshek Zhangylyssov
ORCID logo ,
Aibek Nurpeissov
* ORCID logo ,
Sapargali Pazylbek
,
Diana Griesiute
,
Aleksej Zarkov
ORCID logo ,
Aivaras Kareiva
ORCID logo
Version 1 : Received: 4 March 2024 / Approved: 5 March 2024 / Online: 5 March 2024 (15:10:54 CET)

A peer-reviewed article of this Preprint also exists.

Nurakhmetov, T.N.; Alibay, T.T.; Zhangylyssov, K.B.; Nurpeissov, A.S.; Pazylbek, S.; Griesiute, D.; Zarkov, A.; Kareiva, A. Luminescence and Electron–Hole-Trapping Centers in α-Ca2P2O7-Mn. Crystals 2024, 14, 406. Nurakhmetov, T.N.; Alibay, T.T.; Zhangylyssov, K.B.; Nurpeissov, A.S.; Pazylbek, S.; Griesiute, D.; Zarkov, A.; Kareiva, A. Luminescence and Electron–Hole-Trapping Centers in α-Ca2P2O7-Mn. Crystals 2024, 14, 406.

Abstract

The mechanisms of formation of induced intrinsic and impurity radiative states, which consist of intrinsic and impurity electron-hole trapping centers in irradiated Ca2P2O7-Mn and Ca2P2O7 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 Mn^2+ O^2- Mn^2+ and the neighboring ion O^2- (P2O7)^4-. 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 Mn^2+ and (P2O7)^4- ions results.

Keywords

electrons and holes; trapping center; luminescence; XRD; SEM; Emission spectra; Excitation spectra

Subject

Physical Sciences, Condensed Matter Physics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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