Effect of Mg 2+ ions co-doping on timing performance and radiation tolerance of Cerium doped Gd 3 Al 2 Ga 3 O 12 crystals

Lucchini, M. T.; Babin, V.; Boháček, P.; Gundacker, S.; Kamada, Kei; Nikl, M.; Պետրոսյան, Ա. Գ.; Yoshikawa, Akira; Auffray, E.

doi:10.1016/j.nima.2016.02.004

Cited by 96 publications

(97 citation statements)

References 30 publications

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“…However, as recently demonstrated in [20] and references therein, the rise time of GAGG:Ce might be substantially decreased by co-doping by magnesium. .…”

Section: Discussionmentioning

confidence: 75%

Luminescence rise time in self-activated PbWO4 and Ce-doped Gd3Al2Ga3O12 scintillation crystals

Auffray

Augulis

Borisevich³

et al. 2016

Journal of Luminescence

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Highlights: Photoluminescence rise time is studied in two scintillators: PWO and GAGG:Ce This study is encouraged by the necessity to find novel detection methods enabling a sub-10-ps time resolution in scintillation detectors and is focused on the exploitation of fast luminescence rise front. Time-resolved photoluminescence (PL) spectroscopy and thermally stimulated luminescence techniques have been used to study two promising scintillators: self-activated lead tungstate (PWO, PbWO4) and Ce-doped gadolinium aluminum gallium garnet (GAGG, Gd3Al2Ga3O12). A sub-picosecond PL rise time is observed in PWO, while longer processes in the PL response in GAGG:Ce are detected and studied. The mechanisms responsible for the PL rise time in selfactivated and doped scintillators are under discussion.

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“…However, as recently demonstrated in [20] and references therein, the rise time of GAGG:Ce might be substantially decreased by co-doping by magnesium. .…”

Section: Discussionmentioning

confidence: 75%

Luminescence rise time in self-activated PbWO4 and Ce-doped Gd3Al2Ga3O12 scintillation crystals

Auffray

Augulis

Borisevich³

et al. 2016

Journal of Luminescence

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“…Recently, we demonstrated that the luminescence build up after short‐pulse excitation becomes significantly faster, when GAGG:Ce crystal is codoped by Mg . This observation of the shortening of the luminescence rise time is in line with the previous results on the coincidence time resolution, where substantial improvement of the response time in Mg‐codoped GAGG:Ce crystals is observed at certain decrease of the light yield . At a small energy release, using 511 keV gamma‐rays from 22 Na source, the Coincidence Resolving Time (CTR) with full width at half maximum (FWHM) of 540 and 233 ps was measured in GAGG:Ce without and with Mg codoping, respectively.…”

Section: Introductionmentioning

confidence: 97%

Excitation Transfer Engineering in Ce‐Doped Oxide Crystalline Scintillators by Codoping with Alkali‐Earth Ions

Auffray

Augulis

Fedorov

et al. 2018

Physica Status Solidi (a)

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Time‐resolved spectroscopic study of the photoluminescence response to femtosecond pulse excitation and free carrier absorption at different wavelengths, thermally stimulated luminescence measurements and investigation of differential absorption are applied to amend the available data on excitation transfer in GAGG:Ce scintillators, and an electronic energy‐level diagram in this single crystal is suggested to explain the influence of codoping with divalent Mg on luminescence kinetics and light yield. The conclusions are generalized by comparison of the influence of aliovalent doping in garnets (GAGG:Ce) and oxyorthosilicates (LSO:Ce and YSO:Ce). In both cases, the codoping facilitates the energy transfer to radiative Ce3+ centers, while the light yield is increased in the LYSO:Ce system but reduced in GAGG:Ce.

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“…In previous articles, a reduction in the rise time to tens of picoseconds with the increasing Mg content was demonstrated . However, this could not be observed using our setup because the minimum width of the excitation e‐beam pulse was 50 ns.…”

Section: Resultsmentioning

confidence: 58%

“…This problem can be solved by co‐doping the garnet with Mg 2+ . This leads to additional afterglow reduction in LuGAGG:Ce, and especially in Lu 3 Al 5 O 12 :Ce (LuAG:Ce) systems, to both rise and decay time reduction, but also, unluckily, to LY reduction at higher Mg co‐doping. The afterglow suppression was explained by the Ce 4+ center stabilization, competing better with electronic traps for charge capture, which resulted in practical inactivation of shallow traps.…”

Section: Introductionmentioning

confidence: 99%

Influence of Mg‐to‐Ce Concentration Ratio on Cathodoluminescence in LuAG and LuGAGG Single‐Crystalline Films

Lalinský

Schauer

Kučera

2019

Physica Status Solidi (a)

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The cathodoluminescence (CL) characterizations of Lu3Al5O12:Ce,Mg (LuAG:Ce,Mg) and of multicomponent (Lu0.25Gd0.74)3(Ga2.48Al2.52)O12:Ce,Mg (LuGAGG:Ce,Mg) single‐crystalline garnet films are supported by the optical absorption spectroscopy. Using this approach, the influence of the Mg‐to‐Ce concentration ratio on the CL spectra and the CL decay is analyzed. The crucial role of stable Ce4+ centers in CL is shown in Mg‐rich film studies. Although the CL intensity is somewhat reduced, drastic improvements in timing performance are demonstrated, including the CL decay time as low as 4.2 ns and the afterglow as low as 0.015% at 500 ns after the e‐beam excitation cutoff. These results predetermine the utilization of the LuAG:Ce,Mg and LuGAGG:Ce,Mg single‐crystalline films in e‐beam detection systems, where especially fast scintillator response is crucial.

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Effect of Mg 2+ ions co-doping on timing performance and radiation tolerance of Cerium doped Gd 3 Al 2 Ga 3 O 12 crystals

Cited by 96 publications

References 30 publications

Luminescence rise time in self-activated PbWO4 and Ce-doped Gd3Al2Ga3O12 scintillation crystals

Luminescence rise time in self-activated PbWO4 and Ce-doped Gd3Al2Ga3O12 scintillation crystals

Excitation Transfer Engineering in Ce‐Doped Oxide Crystalline Scintillators by Codoping with Alkali‐Earth Ions

Influence of Mg‐to‐Ce Concentration Ratio on Cathodoluminescence in LuAG and LuGAGG Single‐Crystalline Films

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