| Title |
Luminescence and electron–hole-trapping centers in α-Ca2P2O7−Mn / |
| Authors |
Nurakhmetov, Turlybek ; Alibay, Temirulan ; Zhangylyssov, Keleshek ; Nurpeissov, Aibek ; Pazylbek, Sapargali ; Griesiūtė, Diana ; Žarkov, Aleksej ; Kareiva, Aivaras |
| DOI |
10.3390/cryst14050406 |
| Full Text |
|
| Is Part of |
Crystals.. Basel : MDPI. 2024, vol. 14, iss. 5, art. no. 406, p. [1-15].. eISSN 2073-4352 |
| Keywords [eng] |
electrons and holes ; trapping center ; luminescence ; XRD ; SEM ; emission spectra ; excitation spectra |
| Abstract [eng] |
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 (𝑃2𝑂7)4− ions results. |
| Published |
Basel : MDPI |
| Type |
Journal article |
| Language |
English |
| Publication date |
2024 |
| CC license |
|
