Scintillation characteristics and temperature quenching of radio- and photoluminescence of Mg.sup.2+./sup.-codoped (Lu,Gd).sub.3./sub.Al.sub.2.4./sub.Ga.sub.2.6./sub.O.sub.12./sub.:Ce garnet crystals

0546080 - FZÚ 2022 RIV NL eng J - Journal Article
Chewpraditkul, Wa. - Pattanaboonmee, N. - Sakthong, O. - Chewpraditkul, W. - Yamaji, A. - Kurosawa, S. - Kamada, K. - Yoshikawa, A. - Makowski, M. - Witkowski, M.E. - Drozdowski, W. - Beitlerová, Alena - Kučerková, Romana - Babin, Vladimir - Nikl, Martin
Scintillation characteristics and temperature quenching of radio- and photoluminescence of Mg²⁺-codoped (Lu,Gd)₃Al_2.4Ga_2.6O₁₂:Ce garnet crystals.
Optical Materials. Roč. 121, Nov. (2021), č. článku 111595. 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: 3.754, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.optmat.2021.111595

Luminescence and scintillation characteristics of Mg2+-codoped (LuxGd3-x)Al2.4Ga2.6O12:Ce (x =0.2–0.8) garnet crystals grown by the micro-pulling down method are investigated. The Ce3+ 5d1 → 4f luminescence is blue-shifted with increasing Lu content due to the decrease in crystal field splitting of the 5d levels. With increasing Lu content, the shortening of scintillation decay time accompanied with a decrease of LY value as measured at room temperature can be explained by thermal ionization of the Ce3+ 5d1 excited state. Co-doping with Mg2+ results in the shortening of scintillation decay time, the reduction of LY value and afterglow intensity. At low temperature the radioluminescence quenching is observed in correlation with large thermoluminescence peaks, which can be attributed to the localization of electrons at intrinsic shallow traps.
Permanent Link: http://hdl.handle.net/11104/0322678