The Stable Center: A New Tool to Optimize Ce-Doped Oxide Scintillators

Nikl, M.; Babin, V.; Pejchal, Jan; Laguta, V. V.; Buryi, M.; Mareš, J.; Kamada, Kei; Kurosawa, Shunsuke; Yoshikawa, Akira; Pánek, Dalibor; Parkman, Tomáš; Brůža, Petr; Mann, Klaus; Müller, Matthias

doi:10.1109/tns.2015.2495119

Cited by 38 publications

(32 citation statements)

References 25 publications

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“…This band, related to the charge transfer (CT) transition from the valence band to a defect stabilized by Mg 2+ (e.g. Ce 4+ ions) [10], is more pronounced in the LuAG:Ce crystals having the lowest concentration of Ce 3+ ions. The absorption spectrum of the GAGG:Ce sample also shows a set of narrow absorption bands in the UV range corresponding to the transitions from 8 S ground state to the numerous components of P, I, and D terms split by spinorbit interaction.…”

Section: Resultsmentioning

confidence: 99%

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Measurement of non-equilibrium carriers dynamics in Ce-doped YAG, LuAG and GAGG crystals with and without Mg-codoping

Lucchini

Буганов

Auffray

et al. 2018

Journal of Luminescence

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Non-linear absorption spectroscopy in pump and probe configuration has been used to test the population of nonequilibrium carriers in Ce-doped Y 3 Al 5 O 12 (YAG), Lu 3 Al 5 O 12 (LuAG), and Gd 3 Al x Ga (5−x) O 12 (GAGG) crystals with and without codoping by Mg 2+ ions. A faster rise time of the induced optical density has been observed in all crystals codoped with Mg with respect to that in Mg-free samples. A significant difference in the time evolution of the differential optical density in GAGG with respect to YAG and LuAG crystals has also been measured. In both GAGG:Ce and GAGG:Ce,Mg an absorption band with maximum in the blue-green range and a decay time of 1.4 ps is present. This band is due to the absorption by free electrons before they are trapped or recaptured by Ce 3+ ions. A broad absorption band in the yellow-red region with very short rise time and a decay time longer than 150 ps has been observed in all the Ce-doped garnets under study and can be attributed to the absorption from the Ce 3+ excited states.

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Section: Resultsmentioning

confidence: 99%

“…Mg 2+ and O − in close proximity of the divalent cation is also favored [10,11]. Moreover, the codoping of Ceactivated crystals by divalent ions (even at the level of a few hundreds ppm) causes the oxidation of a fraction of the Ce 3+ ions into Ce 4+ .…”

mentioning

confidence: 99%

Measurement of non-equilibrium carriers dynamics in Ce-doped YAG, LuAG and GAGG crystals with and without Mg-codoping

Lucchini

Буганов

Auffray

et al. 2018

Journal of Luminescence

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“…This aliovalent doping, in which a trivalent ion is substituted by a divalent second group cation in the host matrix, results in the formation of anionic vacancies that compensate for the resulting charge. The formation of a hole‐type defect including Mg 2+ and O − in close proximity is also quite probable . Moreover, the codoping of Ce‐activated crystals by divalent ions (even at the level of less than 1 at.%) causes oxidation of part of the Ce 3+ ions to Ce 4+ .…”

Section: Introductionmentioning

confidence: 99%

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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“…Among the hypotheses is the formation of O – ‐like centers (a migrating hole trapped by the oxygen sublattice). These centers were proven by the electron paramagnetic resonance in LuAG:Ce,Mg single‐crystals and ceramics, and they can act as nonradiative centers causing a light loss . Furthermore, at higher Mg concentrations, oxygen vacancies, constituting deep electron traps, can also be formed.…”

Section: Resultsmentioning

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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The Stable Center: A New Tool to Optimize Ce-Doped Oxide Scintillators

Cited by 38 publications

References 25 publications

Measurement of non-equilibrium carriers dynamics in Ce-doped YAG, LuAG and GAGG crystals with and without Mg-codoping

Measurement of non-equilibrium carriers dynamics in Ce-doped YAG, LuAG and GAGG crystals with and without Mg-codoping

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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