Subpicosecond luminescence rise time in magnesium codoped GAGG:Ce scintillator

Тамулайтис, Г.; Vaitkevičius, A.; Наргелас, С.; Augulis, Ramu̅nas; Gulbinas, Vidmantas; Boháček, P.; Nikl, M.; Borisevich, A.; Fedorov, A.; Korjik, M.; Auffray, E.

doi:10.1016/j.nima.2017.07.015

Cited by 35 publications

(15 citation statements)

References 22 publications

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“…At 3.6 eV, corresponding to the resonant excitation to absorption band of Ce 3+ ions, the time constant of the slow rise component τ r = 2.5 ns is shorter but still considerably longer than the instrumental response function. As reported before, the slow rise component disappears in GAGG:Ce,Mg, and luminescence rise proceeds in subpicosecond time range.…”

Section: Resultsmentioning

confidence: 99%

“…As reported before, the rise edge in the DA response of GAGG:Ce consists of two components: the first one is faster than the excitation pulse rise time (in subpicosecond domain), and the second is slower, on the order of a few picoseconds. In this paper, we show that decreasing the probe photon energy down to ≈1 eV does not have a substantial influence on the DA rise edge.…”

Section: Resultsmentioning

confidence: 99%

“…Unfortunately, the codoping of GGAG:Ce by Mg results in a lower scintillation light yield (LY) at room temperature (RT), contrary to the codoping of LSO:Ce and LYSO:Ce by divalent Ca or Mg . 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 .…”

Section: Introductionmentioning

confidence: 95%

See 2 more Smart Citations

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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

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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“…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%

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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“…A positive role in the GGAG:Ce co‐doping with Mg 2+ to diminish the level of phosphorescence was demonstrated in . Such doping, in which a trivalent ion was substituted by a divalent alkali–earth cation in the host matrix, activated a mechanism of fast recombination of carriers captured by intrinsic defects, and accelerated the luminescence build up in the crystal . However, the co‐doping of Ce‐activated crystals by divalent ions (even at the level of less than 0.1 atomic %) oxidized the part of Ce 3+ ions into Ce 4+ .…”

Section: Consideration Of Defects In Mixed Crystal Structurementioning

confidence: 99%

Nanoengineered Gd₃Al₂Ga₃O₁₂ Scintillation Materials with Disordered Garnet Structure for Novel Detectors of Ionizing Radiation

Korzhik

Аленков

Бузанов

et al. 2019

Crystal Research and Technology

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The search for engineering approaches to improve the scintillation properties of Gd3Al2Ga3O12 crystals and enable their production technology is of current interest. This crystal, while doped with Ce, is considered a good multi‐purpose scintillation material for detecting gamma‐quanta and neutrons. It is observed that co‐doping with Mg affected intrinsic defects in the crystal structure that create shallow electronic traps. Other point structure defects, which are based on local variations of the crystal stoichiometry, are significantly diminished by use of a co‐precipitated raw material. Nano‐structuring of the raw material enables production of a homogeneous precursor mixture for growing a crystal with minimal evaporation of Ga from the melt. The demonstrated nano‐engineering approach increased the light yield from the crystal by approximately 20%, enabling its applications in well logging.

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Subpicosecond luminescence rise time in magnesium codoped GAGG:Ce scintillator

Cited by 35 publications

References 22 publications

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

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

Nanoengineered Gd₃Al₂Ga₃O₁₂ Scintillation Materials with Disordered Garnet Structure for Novel Detectors of Ionizing Radiation

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Subpicosecond luminescence rise time in magnesium codoped GAGG:Ce scintillator

Cited by 35 publications

References 22 publications

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

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

Nanoengineered Gd3Al2Ga3O12 Scintillation Materials with Disordered Garnet Structure for Novel Detectors of Ionizing Radiation

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Product

Resources

About

Nanoengineered Gd₃Al₂Ga₃O₁₂ Scintillation Materials with Disordered Garnet Structure for Novel Detectors of Ionizing Radiation