Energy Band Structure and Optical Properties of LiNaSO4 Crystals

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu3+ and Tb3+ Ion Doping

“…Further, it was noticed that the VB top coincides with Fermi level ( E F ) in these kinds of materials and terming them as direct band material. [ 44 ]…”

“…Further, these anionic compounds give rise to tetrahedral and octahedral cavities, and thereby accommodating Li + and H + ions, respectively. [18] Also as per the bandgap calculations carried out on these alkali sulfates, the energy levels at the valence band (VB) top are expressed by a low dispersion typical for kind of crystals, [44] hence projecting us that the chemical bond between the groups of atoms forming them is comparatively very feeble. Maximum dispersion energy-momentum plot was seen for the low levels of the conduction band (CB) in regions of the Brillouin zone.…”

“…Further, it was noticed that the VB top coincides with Fermi level (E F ) in these kinds of materials and terming them as direct band material. [44] For these kinds of crystals, it has been noticed that the upper valence bands are completely made up of р-electrons (means 2p orbital) of oxygen from SO 2− 4 anionic complexes (the valence bands are dominated by the O 2p states). In addition, within range deeply located VB levels, a significant contribution is done by oxygen s-states, sulfur p-states, and as well as by the oxygen p-states.…”

“…However, at energies (Е) greater than 6 eV, sulfur, and oxygen p-states significantly start to show appearances. [44] Figure 10 shows the room temperature excitation and PL spectra of Eu 3+ doped LSMH. Looking at the excitation spectra, we can find two broad CTB's at 238 and 393 nm.…”

Барические Изменения Параметров Оптической Индикатрисы Кристаллов Литий Натрий Сульфата

“…Ранее исследовались спектральные зависимости показателей преломления n i (λ) [20]. Установлено, что дисперсия n i (λ) нормальная (dn i /dλ < 0), а соотношения n x = n y = n z и n z > n x ,y справедливы для всей исследуемой области спектра, что подтверждает тот факт, что ЛНС является оптически одноосным и положительным [8].…”