Optical and scintillation characteristics of Lu.sub.2./sub.Y(Al.sub.5-x./sub.Ga.sub.x./sub.)O.sub.12./sub.:Ce,Mg multicomponent garnet crystals

0564930 - FZÚ 2023 RIV NL eng J - Journal Article
Chewpraditkul, Wa. - Pattanaboonmee, N. - Chewpraditkul, W. - Kamada, K. - Kim, K.J. - Yoshikawa, A. - Makowski, M. - Witkowski, M.E. - Drozdowski, W. - Beitlerová, Alena - Kučerková, Romana - Babin, Vladimir - Nikl, Martin
Optical and scintillation characteristics of Lu₂Y(Al_5-xGa_x)O₁₂:Ce,Mg multicomponent garnet crystals.
Optical Materials. Roč. 134, Dec. (2022), č. článku 113186. ISSN 0925-3467. E-ISSN 1873-1252
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA21-17731S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : Ce³⁺ * afterglow * light yield * luminescence * scintillation * thermoluminescence
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.9, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.optmat.2022.113186

Optical and scintillation characteristics of Mg2+-codoped Lu2Y(Al5-xGax)O12:Ce (x = 2, 3) multicomponent garnet crystals grown by the micro-pulling down method were investigated. At RT, the shortening of scintillation decay time and a decrease of light yield (LY) value measured for a higher Ga containing samples can be explained by thermal ionization of the Ce3+ 5d1 excited state. At 662 keV γ-rays, Lu2YAl3Ga2O12: Ce, 0.05%Mg exhibits high LY value of 29,000 ph/MeV along with scintillation decay times of 50 ns (86%) + 73 ns (14%). Co-doping with larger Mg2+ content leads to a decrease of LY value, scintillation decay time, and afterglow level. Radioluminescence quenching observed at low temperature region in correlation with large thermoluminescence peaks can be caused by trapping of electrons at intrinsic shallow traps.
Permanent Link: https://hdl.handle.net/11104/0336512