Luminescence and Electron–Hole-Trapping Centers in α-Ca2P2O7−Mn

• Published in: Crystals (Basel) Vol. 14; no. 5; p. 406
• Main Authors: Nurakhmetov, Turlybek N., Alibay, Temirulan T., Zhangylyssov, Keleshek B., Nurpeissov, Aibek S., Pazylbek, Sapargali, Griesiute, Diana, Zarkov, Aleksej, Kareiva, Aivaras
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-05-2024
• Subjects: Anions; Atoms & subatomic particles; Charge transfer; Cooling; electrons and holes; emission spectra; Energy gap; Energy industry; Excitation; Impurities; luminescence; Manganese ions; Optical properties; Optics; Phosphates; Photons; Radiation; Scanning electron microscopy; SEM; Trapping; trapping center; XRD; Belarus; Japan
• ISSN: 2073-4352; 2073-4352
• DOI: 10.3390/cryst14050406

The mechanisms of formation of induced intrinsic and impurity radiative states, which consist of intrinsic and impurity electron–hole-trapping center states 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 Mn2+(O2−−Mn2+) 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 Mn2+ and (P2O7)4− ions results.