0636120 - FZÚ 2026 RIV GB eng J - Článek v odborném periodiku
Nikl, Martin - Pejchal, Jan - Ježek, J. - Sedmidubský, D. - Laguta, Valentyn - Babin, Vladimir - Beitlerová, Alena - Kučerková, Romana
GSAG:Ce scintillator: material optimization and intrinsic bottlenecks.
Materials Advances. Roč. 6, č. 11 (2025), s. 3596-3604. E-ISSN 2633-5409
Grant CEP: GA MŠMT(CZ) EH23_020/0008525; GA ČR(CZ) GA21-17731S
Výzkumná infrastruktura: e-INFRA CZ II - 90254
Institucionální podpora: RVO:68378271
Klíčová slova: GSAG:Ce * scintillator * micropulling down * scintillation
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 5.2, rok: 2023
Způsob publikování: Open access
DOI: https://doi.org/10.1039/d5ma00095e

Several Sc-admixed garnet single crystals of the general composition (Gd,Sc)3(Sc,Al)5O12:Ce and the well-established Gd3Ga2.7Al2.3O12:Ce (GGAG:Ce) one were grown using the micropulling down method. Their optical, luminescence and scintillation characteristics were measured and mutually compared to further optimize the former compositions and reveal the reason for their lower scintillation performance with respect to GGAG:Ce. Correlated experiments of time-resolved luminescence and scintillation spectroscopies further completed by thermoluminescence glow curve measurement and electron paramagnetic resonance (performed on Gd-free Sc-admixed garnets) indicate that Sc3+ is situated at the dodecahedral site of the garnet lattice as a dominant electron trap, creating a bottleneck in the scintillation mechanism of Sc-admixed garnets. This is mainly responsible for the degradation of scintillation efficiency in comparison with GGAG:Ce despite nearly the same effects of Sc and Ga in lowering the conduction band edge in these multicomponent garnets. Calculations of the electronic band structure confirm that the 3d energy levels of Sc3+ at the dodecahedral site are situated in the forbidden gap in Sc-admixed garnets.
Trvalý link: https://hdl.handle.net/11104/0367123
 
Vědecká data v ASEP:
GSAG:Ce scintillator: Material optimization and intrinsic bottlenecks: the Data for Figures