Luminescence and vacuum ultraviolet excitation spectroscopy of cerium doped Gd3Ga3Al2O12 single crystalline scintillators under synchrotron radiation excitations

Козлова, А. П.; Kasimova, V. M.; Бузанов, О. А.; Chernenko, Kirill; Klementiev, Konstantin; Pankratov, V.

doi:10.1016/j.rinp.2020.103002

Cited by 23 publications

(10 citation statements)

References 40 publications

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“…However, some part of Ce 3+ ions were transformed to the Ce 4+ ions in order to compensate the lack of the positive charge due to Mg 2+ codopant ions. The existence of the Ce 4+ ions in the Mg 2+ co-doped crystals was confirmed by our recent XANES experiments 44 . These results also demonstrated that all other crystals, including the Ca 2+ co-doped one, do not reveal the existence of Ce 4+ ions.…”

Section: Resultssupporting

confidence: 64%

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Time-resolved luminescence and excitation spectroscopy of co-doped Gd3Ga3Al2O12 scintillating crystals

Pankratova

Козлова

Бузанов

et al. 2020

Sci Rep

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Cerium doped Gd3Ga3Al2O12 (GGAG) single crystals as well as GGAG:Ce single crystals co-doped by divalent (Mg2+, Ca2+) and tetravalent (Zr4+, Ti4+) ions have been studied by means of time-resolved luminescence as well as the excitation luminescence spectroscopy in vacuum ultraviolet (VUV) and soft X-ray (XUV) spectral range. Tunable laser excitation was applied for time-resolved experiments in order to obtain luminescence decay curves under excitations in Ce3+, Gd3+ and excitonic absorption bands. The influence of the co-dopant ions on the Ce3+ luminescence decay kinetics is elucidated. The fastest luminescence decay was observed for the Mg2+ co-doped crystals under any excitation below bandgap energy indicating the perturbation of the 5d states of Ce3+ by Mg2+ ions. Synchrotron radiation was utilized for the luminescence excitation in the energy range from 4.5 to 800 eV. Special attention was paid to the analysis of Ce3+ excitation spectra in VUV and XUV spectral range where multiplication of electronic excitation (MEE) processes occur. Our results demonstrated that GGAG:Ce single crystals co-doped by Mg2+ ions as well as the GGAG:Ce crystal annealed in vacuum reveal the most efficient excitation of Ce3+ emission in VUV-XUV excitation range. The role of intrinsic defects in MEE processes in the co-doped as well as in the annealed GGAG:Ce single crystals is discussed.

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Section: Resultssupporting

confidence: 64%

“…2. Another possible explanation is the perturbation of some Ce 3+ states by co-dopant ions as it was recently suggested 44 . It is assumed that the strongest perturbation is induced by ions with biggest ionic radii among co-dopants, i.e.…”

Section: Resultsmentioning

confidence: 88%

Time-resolved luminescence and excitation spectroscopy of co-doped Gd3Ga3Al2O12 scintillating crystals

Pankratova

Козлова

Бузанов

et al. 2020

Sci Rep

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“…Co‐doping with divalent impurities to favor Ce 4+ states was then successfully applied to several garnets [lutetium‐aluminum (LuAG):Ce,Mg, [ 10 ] YAG:Ce,Mg, [ 11 ] gadolinium‐gallium‐aluminum (GAGG):Ce,Mg(Ca), [ 12–14 ] LuAG:Ce,Ca [ 15 ] ]. The presence of stable Ce 4+ centers was confirmed by direct X‐ray spectroscopy methods [X‐ray absorption near edge structure (XANES) or X‐ray absorption spectroscopy (XAS)] in LYSO:Ce,Ca(Mg), [ 9 ] GAGG:Ce,Mg, [ 14,16 ] LuAG:Ce,Mg, [ 14 ] and YAG:Ce,Ca. [ 17 ] In XANES spectra of GGAG:Ce,Ca, [ 16 ] only some traces of the band corresponding to Ce 4+ could be tentatively resolved and explained as possibly due to a low concentration of Ca 2+ .…”

Section: Introductionmentioning

confidence: 99%

“…The presence of stable Ce 4+ centers was confirmed by direct X‐ray spectroscopy methods [X‐ray absorption near edge structure (XANES) or X‐ray absorption spectroscopy (XAS)] in LYSO:Ce,Ca(Mg), [ 9 ] GAGG:Ce,Mg, [ 14,16 ] LuAG:Ce,Mg, [ 14 ] and YAG:Ce,Ca. [ 17 ] In XANES spectra of GGAG:Ce,Ca, [ 16 ] only some traces of the band corresponding to Ce 4+ could be tentatively resolved and explained as possibly due to a low concentration of Ca 2+ . For applicative purposes, the overlap between the charge transfer (CT) absorption of Ce 4+ with onset below 350 nm and the emission of Ce 3+ has to be minimal, which is the case for most garnets.…”

Section: Introductionmentioning

confidence: 99%

Synergetic Li–Ca Co‐Doping for Ce Valence Conversion in Yttrium Aluminum Garnet

Hovhannesyan

Derdzyan

Novikov

et al. 2020

Physica Status Solidi (b)

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Herein, optical‐quality single crystals of yttrium aluminum garnet (YAG):Ce,Ca,Li are grown by the vertical Bridgman method. Substitution and charge compensation mechanisms of Li+ are considered based on optical absorption in as‐grown and γ‐ray‐irradiated single crystals and their luminescence decay and rise time under X‐ray excitation. The measurements are conducted on single crystals with impurity concentrations varying over a wide range. A suitable combination of Ca and Li concentration is able to control the cerium valence, which plays a major role in the time response under ionizing radiation.

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“…Since the excitons in wide-bandgap materials are in the deep ultraviolet and vacuum ultraviolet (VUV) spectral ranges, synchrotron radiation has proved especially useful in excitation spectroscopy [19][20][21][22][23][24][25][26][27][28]. For instance, it was shown [29] that in alkali halides the excitation spectra in VUV range exhibit general correlation between peaks in fundamental optical absorption and dips in luminescence yield, attributable in part to reflection of the excitation light, genuine state-selectivity controlling subsequent STE relaxation path, and competing channels for electron-hole pair decay.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature luminescence of ScF3 single crystals under excitation by VUV synchrotron radiation

Pankratova

Purans

Pankratov

2020

Low Temperature Physics

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Photoluminescence and excitation spectra of ScF 3 single crystals have been measured under vacuum ultraviolet excitations utilizing undulator synchrotron radiation from 1.5 GeV storage ring of MAX IV synchrotron. The emission peak at 280 nm is explained as emission band of self-trapped excitons in ScF 3 . This emission is quenched at 50 K and activation energy of thermal quenching was obtained. The excitation spectrum in vacuum ultraviolet spectral range exhibits that the luminescence of self-trapped excitons effectively occurs under direct excitation in the excitonic absorption band, whereas under higher energies this excitation is strongly suppressed, however multiplication of electronic excitation processes have been successfully identified.

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Luminescence and vacuum ultraviolet excitation spectroscopy of cerium doped Gd3Ga3Al2O12 single crystalline scintillators under synchrotron radiation excitations

Cited by 23 publications

References 40 publications

Time-resolved luminescence and excitation spectroscopy of co-doped Gd3Ga3Al2O12 scintillating crystals

Time-resolved luminescence and excitation spectroscopy of co-doped Gd3Ga3Al2O12 scintillating crystals

Synergetic Li–Ca Co‐Doping for Ce Valence Conversion in Yttrium Aluminum Garnet

Low-temperature luminescence of ScF3 single crystals under excitation by VUV synchrotron radiation

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