20.500.12556/DiRROS-29343
Scandium and aluminum substitution and energy transfer processes in the undoped and Ce-doped ▫$Y_{3}Sc_{?}Al_{5−?}O_{12}$▫ scintillation crystals
The structural and scintillation properties of pure and Ce-doped Y3Sc�Al5−�O12 (�=0, 0.05, 1.16, and 2) crystals were systematically investigated. High-resolution 45 Sc and 27 Al magic angle spinning nuclear magnetic resonance spectroscopy revealed that Sc3+ ions predominantly occupy octahedral sites, effectively replacing Al3+ ions, while antisite Sc at Y dodecahedral positions remains below 0.2 at.%. Sc incorporation into Y3Al5O12 induces strong exciton emission at 320–324 nm, nearly 10 times higher than that of reference Bi4Ge3O12 (BGO) crystal, even at low Sc concentrations (5 at.%). Ce3+ doping introduces characteristic 5�1→4� emission at 518 nm, accelerates scintillation decay, and in combination with Mg2+ codoping, promotes the formation of Ce4+ ions that enable a fast radiative de-excitation pathway. Y3Sc2Al3O12: Ce exhibits a maximum scintillation light yield of 80–84% relative to BGO with a mean decay time of 85–110 ns. Thermostimulated liminescence and electron paramagnetic resonance studies indicate that holes are mainly trapped at oxygen ions near Sc ions (O− centers), while electrons are primarily localized at Sc antisite ions near oxygen vacancies (Sc2+–VO centers), affecting scintillation kinetics. Density functional theory calculations confirm that Sc3+ at the dodecahedral site forms a deep electron trap. These results highlight the key role of Sc and Ce in tuning emission, decay dynamics, and defect-mediated processes in Sc-admixed multicomponent garnet scintillators.
garnet scintillators
rare-earth doping
defect physics and charge trapping
scintilatorski garneti
redkozemeljsko dopiranje
defektna fizika in pasti nabojev
true
false
true
American Physical Society
ZDA
Angleški jezik
Slovenski jezik
Neznano
2026-05-08 15:25:59
2026-05-08 15:26:00
2026-05-09 03:44:22
0000-00-00 00:00:00
2026
0
0
Nasl. z nasl. zaslona;
Soavtor iz Slovenije: Andraž Rešetič;
Opis vira z dne 23. 4. 2026;
str. 045201-1-045201-13
[article no.] 045201
Vol. 10
Apr. 2026
0000-00-00
Zaloznikova
Objavljeno
NiDoloceno
2025-12-18
2026-03-24
2026-04-17
538.9
2475-9953
10.1103/png3-xnt7
276255747
https://journals.aps.org/prmaterials/abstract/10.1103/png3-xnt7
1
74d2f3e6-4ae1-11f1-8a5a-001a4af901a5
https://dirros.openscience.si/Dokument.php?lang=slv&id=43946
RAZ_Laguta_Valentin_V._2026.pdf
RAZ_Laguta_Valentin_V._2026.pdf
1
E60C3DFAB01239E895C7BF01254BAC0B
dc95904cb7c8c0edae25a9c159e2fecba82cffc06b346a22db73f60ca68d1b28
c682d9ee-4ae1-11f1-8a5a-001a4af901a5
https://dirros.openscience.si/Dokument.php?lang=slv&id=43947
Institut Jožef Stefan
0
0
0