Luminescence and scintillation properties of fast Ce,Mg:Lu.sub.2./sub.YGa.sub.x./sub.Al.sub.5-x./sub.O.sub.12./sub. ceramic scintillators fabricated from co-precipitated powders

0585683 - FZÚ 2025 RIV NL eng J - Journal Article
Sreebunpeng, K. - Chewpraditkul, Wa. - Chewpraditkul, W. - Kučerková, Romana - Beitlerová, Alena - Nikl, Martin - Szczesniak, T. - Grodzicka-Kobylka, M. - Zhu, D. - Hu, Ch. - Li, J.
Luminescence and scintillation properties of fast Ce,Mg:Lu₂YGa_xAl_5-xO₁₂ ceramic scintillators fabricated from co-precipitated powders.
Optical Materials. Roč. 152, June (2024), č. článku 115418. ISSN 0925-3467. E-ISSN 1873-1252
R&D Projects: GA ČR(CZ) GA21-17731S
Institutional support: RVO:68378271
Keywords : Ce,Mg:Lu₂YGa_xAl_5-xO₁₂ ceramics * decay kinetics * luminescence * light yield * coincidence time resolution
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.9, year: 2022

Ce,Mg:Lu2YGaxAl5-xO12 (x = 1.5, 2, 2.5, 3) ceramic scintillators were fabricated by oxygen sintering combined with air annealing using nano-powders synthesized by the co- recipitation method. The Ce3+ 5d1 → 4f (2F5/2, 2F7/2) luminescence band was blue shifted with increasing Ga content due to the decrease in the crystal field splitting of the 5d levels. At room temperature (RT), the decrease of photoluminescence decay time and scintillation decay time was observed with increasing Ga content. At 662 keV γ-rays, the sample Ga2 exhibited high light yield (LY) of 28,700 photons/MeV, fast scintillation decay times of 17.7 ns (17 %) + 45.7 ns (83 %), and good time resolution of ~220 ps. At RT, the decrease of LY value for the samples Ga2.5 and Ga3 could be attributed to the larger thermal ionization of the excited Ce3+ centers.
Permanent Link: https://hdl.handle.net/11104/0353367