Influence of heavy magnesium codoping on emission decay in Ce-doped multicomponent garnet scintillators

Abstract

This study is aimed at the acceleration of luminescence decay in Ce-doped garnet-type scintillators by heavy aliovalent codoping. Time-resolved photoluminescence spectroscopy in a wide temperature range in LuGAGG:Ce epitaxial layers...

Micro-Inclusion Engineering via Sc Incompatibility for Luminescence and Photoconversion Control in Ce3+-Doped Tb3Al5−xScxO12 Garnet

“…The presented crystals were fabricated via a controlled shaping process, yielding consistent geometric form. The maintained cylindrical shape of all crystal rods confirms the congruent melting of the material in all examined samples [ 9 , 11 , 34 , 35 ]. The resulting transparency demonstrated a pronounced dependence on the Sc 3+ ion concentration.…”

“…The absorption characteristics of Ce 3+ ions are significantly influenced by the variation in Sc 3+ ion concentration. This influence can be attributed to the presence of a sub-eutectic microstructure, which notably perturbs the local environment surrounding the Ce 3+ ions [ 11 , 15 , 18 , 35 , 36 , 65 , 67 , 68 ]. This effect is particularly pronounced in the Ce 3+ -doped Tb 3 Al 5−x Sc x O 12 crystals where x = 0.5 and 2.0, where the absorption transition at 450 nm assigned to the interconfigurational 4f → 5d 1 transition of Ce 3+ ions exhibits significant broadening due to the presence of perturbed Ce 3+ sites [ 18 , 68 ].…”

“…Figure 12 presents a comparison of room-temperature radioluminescence spectra for Ce 3+ -doped Tb 3 Al 5−x Sc x O 12 crystals with varying Sc 3+ ion concentrations recorded at 300 K. Notably, the RL spectra lack luminescence in the UV spectral range typically associated with diverse antisite defects and perovskite-phase-related luminescence, commonly observed in systems containing perovskite phase inclusions [ 35 , 36 , 68 , 70 , 76 , 77 ]. This absence of both defect-induced emission and Ce 3+ luminescence within the perovskite phase inclusions can be ascribed to two primary factors: (1) the relatively high emission intensity of Ce 3 ⁺ ions in the garnet phase and (2) the highly efficient energy transfer between Tb 3+ and Ce 3+ ions.…”

“…Unlike conventional synthesis relying on thermodynamic equilibrium, this approach induces kinetic barriers that facilitate the co-precipitation of metastable phases, effectively circumventing the limitations of equilibrium phase diagrams. Notably, this method facilitates the manipulation of multi-phase microstructures through the control of atomic radii mismatch and nonstoichiometric degree within the predominant phases, thereby enabling avenues for the design and development of novel materials with functional properties [ 8 , 9 , 21 , 34 , 35 , 36 ].…”