Hole capture in PbWO.sub.4./sub.:Mo,La(Y) scintillator crystals

0364030 - FZÚ 2012 RIV US eng J - Journal Article
Laguta, Valentyn - Buryi, Maksym - Nikl, Martin - Rosa, Jan - Zazubovich, S.
Hole capture in PbWO₄:Mo,La(Y) scintillator crystals.
Physical Review. B. Roč. 83, č. 9 (2011), "094123-1"-"094123-5". ISSN 1098-0121
R&D Projects: GA AV ČR IAA100100810
Institutional research plan: CEZ:AV0Z10100521
Keywords : scintillator * electron spin resonance * thermally stimulated luminescence * uv irradiation * hole localization
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.691, year: 2011

The processes of localization in PbWO4:Mo,La(Y) single crystals were investigated by electron spin resonance. It was found that the holes created by uv irradiation are trapped at the regular oxygen ions in the vicinity of perturbing defects such as lead vacancies, impurity ions (La, Y), and other lattice imperfections. This leads to a variety of O- centers which differ in both the thermal stability (from about 160 K up to 240 K) and spectroscopic parameters. The thermal release of such trapped holes and their subsequent recombination with electrons stored at different traps, including (MoO4)3- complexes, are accompanied by the appearance of the thermally stimulated luminescence peaks located at around 190 K and in the 225-250 K range.
Permanent Link: http://hdl.handle.net/11104/0199617