Electronic band modification for faster and brighter Ce,Mg:Lu.sub.3-x./sub.Y.sub.x./sub.Al.sub.5./sub.O.sub.12./sub. ceramic scintillators

0517933 - FZÚ 2020 RIV NL eng J - Journal Article
Chen, X. - Hu, Z. - Feng, Y. - Liu, X. - Chen, H. - Shi, Y. - Kou, H. - Kučerková, Romana - Beitlerová, Alena - Mihóková, Eva - Nikl, Martin - Li, J.
Electronic band modification for faster and brighter Ce,Mg:Lu_3-xY_xAl₅O₁₂ ceramic scintillators.
Journal of Luminescence. Roč. 214, Oct (2019), s. 1-8, č. článku 116545. ISSN 0022-2313. E-ISSN 1872-7883
R&D Projects: GA MŠMT EF16_013/0001406; GA MŠMT(CZ) LO1409; GA ČR GA16-15569S
Grant - others:OP VVV - SAFMAT(XE) CZ.02.1.01/0.0/0.0/16_013/0001406
Institutional support: RVO:68378271
Keywords : Ce,Mg:LuYAG ceramics * Y admixture * scintillation yield * decay kinetics
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.280, year: 2019
Method of publishing: Limited access
https://doi.org/10.1016/j.jlumin.2019.116545

Ce,Mg:LuYAG transparent ceramics were successfully fabricated by the solid state reaction method. The results of x-ray diffraction, photoluminescence, light yield, scintillation decay and thermoluminescence are analyzed to provide better understanding of the influence of the Y3+ admixture in LuAG on the lattice structure, electronic band structure, energy-level structure of Ce3+ centers and scintillation properties. The lattice parameter of Ce,Mg:LuYAG ceramics shows a linear growth with the increasing Y content, which is in agreement with Vegard's law. Reducing the Lu-to-Y ratio in the LuYAG matrix, the Ce3+ 5d1 energy level shifts to a lower energy, the forbidden gap becomes narrower and the electron traps become shallower. Furthermore, the increase of light yield and accelerated slow scintillation component are found with increasing Y admixture. The light yield of Ce,Mg:Lu0.5Y2.5Al5O12 ceramics is achieved to 24,500 ph/MeV with 1 μs shaping time.

Permanent Link: http://hdl.handle.net/11104/0303179