Crystal growth and scintillation properties of multi-component oxide single crystals: Ce:GGAG and Ce:La-GPS

Yoshikawa, Akira; Kamada, Kei; Kurosawa, Shunsuke; Shoji, Yasuhiro; Yokota, Yuui; Chani, Valery; Nikl, M.

doi:10.1016/j.jlumin.2015.04.001

Cited by 39 publications

(23 citation statements)

References 32 publications

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“…Although the characteristic CL intensity of LuGAGG:Ce,Mg slightly increases with the increase of Mg concentration up to tens of ppm, unfortunately a further increase of Mg co-doping above 280 ppm quenches the characteristic Ce 3+ emission (Schauer et al, 2017). Such an effect has also been already noticed both in GAGG:Ce,Mg (Yoshikawa et al, 2016) and LuAG:Ce,Mg single crystals and also in ceramics (Liu et al, 2016…”

Section: Electron-photon Conversionmentioning

confidence: 80%

Prospective scintillation electron detectors for S(T)EM based on garnet film scintillators

Schauer

Lalinský

Kučera

2018

Microscopy Res & Technique

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The performance of a scintillation electron detector for a scanning electron microscope and/or a scanning transmission electron microscope (S(T)EM) based on new epitaxial garnet film scintillators was explored. The LuGAGG:Ce and LuGAGG:Ce,Mg film scintillators with chemical formula (Ce0.01Lu0.27Gd0.74)3–wMgw(Ga2.48Al2.46)O12 were prepared and their cathodoluminescence (CL) and optical properties were studied and compared with the properties of current standard bulk single crystal YAG:Ce and YAP:Ce scintillators. More specifically, CL decay characteristics, CL emission spectra, CL intensities, optical absorption coefficients, and the refractive indices of the mentioned scintillators were measured. Furthermore, electron interaction volumes with absorbed energy distributions, photomultiplier (PMT) photocathode matchings, modulation transfer functions (MTF), and the photon transport efficiencies of scintillation detectors with the mentioned scintillators were calculated. A CL decay time for the LuGAGG:Ce,Mg film scintillator as low as 28 ns with an afterglow of only 0.02% at 1 μs after the e‐beam excitation was observed. As determined from calculated MTFs, the scintillation detectors with the new film scintillators lose contrast transfer ability above 0.6 lp/pixel, while the currently commonly used YAG:Ce single crystal scintillators already do so above 0.1 lp/pixel. It was also calculated that the new studied film scintillators have an 8% higher photon transfer efficiency, even for a simple disk shape compared with the standard bulk single crystal YAG:Ce scintillator. The studied LuGAGG:Ce,Mg epitaxial garnet film scintillators were evaluated as prospective fast scintillators for electron detectors, not only in S(T)EM but also in other e‐beam devices.

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Section: Electron-photon Conversionmentioning

confidence: 80%

Prospective scintillation electron detectors for S(T)EM based on garnet film scintillators

Schauer

Lalinský

Kučera

2018

Microscopy Res & Technique

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“…The scintillation decay was also measured under the excitation by nanosecond‐pulsed SXR photons from the infrared laser‐produced plasma in a gaseous argon target . The incoherent SXR photon burst had an FWHM of 4.7 ns and photon energy was within 350–450 eV, for which the attenuation length was of a few hundreds of nanometers.…”

Section: Methodsmentioning

confidence: 99%

“…Most recent members of the garnet scintillators family are (Lu,Y,Gd) 3 (Ga,Al) 5 O 12 :Ce multicomponent garnets . Negative influence of electron traps is diminished in them by adopting the so‐called “band‐gap engineering strategy,” which allows the downward shift of conduction band bottom and Ce 3+ 5d 1 excited state by optimizing the matrix composition.…”

Section: Introductionmentioning

confidence: 99%

Garnet Scintillators of Superior Timing Characteristics: Material, Engineering by Liquid Phase Epitaxy

Průša

Kučera

Babin

et al. 2017

Advanced Optical Materials

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Using liquid phase epitaxy, the Mg co-doped multicomponent garnet film scintillators of composition (Ce 0.01 Lu 0.27 Gd 0.74 ) 3-x Mg x (Ga 2.48 Al 2.46 )O 12 , x = 0-0.002 (0-700 at. ppm) are prepared. Following luminescence and scintillation characteristics and their dependence on Mg concentration are studied: photoluminescence emission and excitation spectra, radioluminescence spectra, photoluminescence and scintillation decay curves, light yield, energy resolution, and afterglow. At lower Mg concentration, the timing characteristics are slightly improved, while light yield and energy resolution are not negatively influenced. At higher Mg concentration, scintillation decay is significantly accelerated, although light yield is somewhat reduced. Afterglow values become extraordinarily low for a garnet scintillator, at least two times better than the best values published so far, which paves the way for their application in fast frame imaging applications. A mechanism of the improvement is shortly discussed.

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“…Many studies aimed at the optimization of yttrium aluminum garnet YAG: Ce have resulted in an optimized garnet by the substitution of Gd for Y and by alloying of Al with Ga [55]- [57]. The presence of gallium oxide complicates somewhat the growth process as low level of oxygen must be used to prevent its decomposition.…”

Section: A Single Crystalsmentioning

confidence: 99%

“…Bridgman technique that uses a graphite crucible in an evacuated dry chamber [55], [65], which allows production at high yield [see Fig. 5(c)].…”

Section: (B)] • a New Growth Technique Similar To A Seeded Verticalmentioning

confidence: 99%

Needs, Trends, and Advances in Inorganic Scintillators

Dujardin

Auffray

Bourret-Courchesne

et al. 2018

IEEE Trans. Nucl. Sci.

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381

240

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This paper presents new developments in inorganic scintillators widely used for radiation detection. It addresses major emerging research topics outlining current needs for applications and material sciences issues with the overall aim to provide an up-to-date picture of the field. While the traditional forms of scintillators have been crystals and ceramics, new research on films, nanoparticles, and microstructured materials is discussed as these material forms can bring new functionality and therefore find applications in radiation detection. The last part of the contribution reports on the very recent evolutions of the most advanced theories, methods, and analyses to describe the scintillation mechanisms.

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Crystal growth and scintillation properties of multi-component oxide single crystals: Ce:GGAG and Ce:La-GPS

Cited by 39 publications

References 32 publications

Prospective scintillation electron detectors for S(T)EM based on garnet film scintillators

Prospective scintillation electron detectors for S(T)EM based on garnet film scintillators

Garnet Scintillators of Superior Timing Characteristics: Material, Engineering by Liquid Phase Epitaxy

Needs, Trends, and Advances in Inorganic Scintillators

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