Undoped and Eu, Na co-doped LiCaAlF.sub.6./sub. scintillation crystals: paramagnetic centers, charge trapping and energy transfer properties

0541716 - FZÚ 2022 RIV NL eng J - Článek v odborném periodiku
Buryi, Maksym - Babin, Vladimir - Laguta, Valentyn - Yokota, Y. - Sato, H. - Yoshikawa, A. - Pejchal, Jan - Nikl, Martin
Undoped and Eu, Na co-doped LiCaAlF₆ scintillation crystals: paramagnetic centers, charge trapping and energy transfer properties.
Journal of Alloys and Compounds. Roč. 858, Mar (2021), č. článku 158297. ISSN 0925-8388. E-ISSN 1873-4669
Grant CEP: GA ČR GA17-09933S; GA MŠMT(CZ) EF16_019/0000760
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: paramagnetic center * charge trapping * neutron scintillator * EPR * TSL
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 6.371, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.jallcom.2020.158297

Single crystals of LiCaAlF6, undoped, Eu-doped and Na co-doped, were studied by electron paramagnetic resonance, radioluminescence and thermally stimulated luminescence techniques applied in a correlated manner. The undoped samples exposed to X-ray irradiation featured two hole-like charge trapping centers which were attributed to the perturbed F2- pseudomolecular ion and O- (as a result of the contact with air).Annealing in air caused the appearance of another defect, a new electron-like center as well. It was found that the europium dominating charge state is 2 + in the LiCaAlF6:Eu,Na samples, however, some amount of the Eu3+ is also present. The amount of the latter is easily governed by the sodium admixture while the former is insensitive to the Na co-doping. The Eu and Na co-doping affected the defects distribution and incorporation in the LiCaAlF6 host.
Trvalý link: http://hdl.handle.net/11104/0319245