Study of charge carrier trapping by EPR and TSL methods in Zn.sub.x./sub.Mg.sub.1-x./sub.WO.sub.4./sub. single crystals

0517932 - FZÚ 2020 RIV NL eng J - Journal Article
Krutyak, N. - Spassky, D.A. - Nagirnyi, V. - Buryi, Maksym - Tupitsyna, I. - Dubovik, A.
Study of charge carrier trapping by EPR and TSL methods in Zn_xMg_1-xWO₄ single crystals.
Optical Materials. Roč. 96, Oct (2019), s. 1-8, č. článku 109362. ISSN 0925-3467. E-ISSN 1873-1252
R&D Projects: GA MŠMT EF16_013/0001406; GA MŠMT(CZ) LO1409
Grant - others:OP VVV - SAFMAT(XE) CZ.02.1.01/0.0/0.0/16_013/0001406
Institutional support: RVO:68378271
Keywords : zinc tungstate * magnesium tungstate * mixed crystals * charge carrier trapping * EPR * TSL
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 2.779, year: 2019
Method of publishing: Limited access
https://doi.org/10.1016/j.optmat.2019.109362

Charge carrier trapping was studied using EPR and TSL methods in ZnWO4, MgWO4 and mixed ZnxMg1-xWO4 crystals. An electron trapped at a perturbed W site was detected in MgWO4. It was also shown that holes are trapped at oxygen ions thus forming O− centers. Two different O- centers, one perturbed by a cation vacancy, another by Al impurity, were found in MgWO4, while a single hole center perturbed by Cd impurity and hydroxyl group nearby was detected in ZnWO4. The number of non-equivalent hole centers increases up to five for the mixed crystals due to the perturbations induced by statistically distributed substitutional cations. It is shown that the thermal release of holes is accompanied by thermostimulated luminescence (TSL). The broadening of the TSL peaks typically observed in mixed crystals is connected with the increase of the number of non-equivalent trapping centers of the same type.

Permanent Link: http://hdl.handle.net/11104/0303174