Abstract:
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 O2− − (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
