Intrinsic emissions and formation of electron-hole trapping centres in excited Li2SO4

Turlybek N. Nurakhmetov, Temirulan T. Alibay, D.A. Tolekov, Raushan K. Shamiyeva, Sapargali Pazylbek, Dovydas Karoblis, Rimantas Raudonis, Aleksej Žarkov, Jonas Kiuberis, Aivaras Kareiva

2023

Full text Open access: Gold Metadata (CSL-JSON)

DOI 10.6001/chemija.2023.34.3.2

Data confidence 70 medium

How this score is calculated

It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.

Abstract

Vacuum ultraviolet and thermal activation spectroscopies were used to study the nature of intrinsic emission and the mechanisms of the formation of electron and hole trapping centres in irradiated Li2SO4 powders and crystals. The obtained results along with excitation spectra showed that recombination emission at 3.8–4.2 eV and 4.5–5.5 eV occurs when an electron passes from the second and third sub-bands of the valence band formed from the 2p state of oxygen to the conduction band. It has been determined that Li2SO4 electron and hole trapping centres are created when electrons are trapped in the SO42– anionic sites. The holes are localised in the form of SO4 – radicals. The spectral position and intensity of individual emission bands are dependent on the crystallographic arrangement of localised holes.