Optical and scintillation properties of Ce 3+ -doped YGd 2 Al 5−x Ga x O 12 ( x =2,3,4) single crystal scintillators

Chewpraditkul, Warut; Brůža, Petr; Pánek, Dalibor; Pattanaboonmee, Nakarin; Wantong, Kriangkrai; Chewpraditkul, Weerapong; Babin, V.; Bartosiewicz, Karol; Kamada, Kei; Yoshikawa, Akira; Nikl, M.

doi:10.1016/j.jlumin.2015.09.001

Cited by 33 publications

(13 citation statements)

References 38 publications

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“…Although the Mg 2+ co‐doping of the LuGAGG:Ce multicomponent garnets does not favorably affect the electron–photon conversion efficiency presented in Figure , the important fact is that the considerable CL temperature quenching of the studied LuGAGG:Ce,Mg film scintillator begins at approximately the temperature of 300 K, that is, above room temperature as previously published (Schauer et al, ). Similar results were also reported by photoluminescence studies of other multicomponent garnets (Chewpraditkul et al, , ). The LuGAGG:Ce,Mg film scintillators may be useful even in an environment with a considerably higher temperature, because they show at least 50% of the low temperature intensity up to the temperature of 400 K.…”

Section: Resultssupporting

confidence: 90%

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: Resultssupporting

confidence: 90%

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

Schauer

Lalinský

Kučera

2018

Microscopy Res & Technique

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“…Figure 7(a) shows that two excitation bands were observed. One is in the range of 390-550 nm and the other is in the range of 320-380 nm, which can be ascribed to the transitions from the ground 4f level to the 5d 1 and 5d 2 of Ce 3+ ions, respectively [42,43]. The excitation band at 320-380 nm is shifted to longer wavelength as Ga content increases, while excitation band at 390-550 nm is shifted to shorter wavelength.…”

Section: Resultsmentioning

confidence: 91%

“…It indicates that crystal field around Ce 3+ ions becomes more symmetric, which is consistent with the results www.springer.com/journal/40145 reported in Refs. [42,43]. As Al ions were completely replaced by Ga ions, no PLE or PL spectrum were observed, which can be attributed to that the 5d energy levels of Ce 3+ ions move into the conduction band and thus results in the luminous quenching.…”

Section: Resultsmentioning

confidence: 99%

YAGG:Ce transparent ceramics with high luminous efficiency for solid-state lighting application

et al. 2019

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A series of Y 2.985 Al 5-x Ga x O 12 :0.015Ce (YAGG:Ce, x = 0, 1, 2, 3, 4, 5) transparent ceramics were prepared via a solid-state reaction method. Two-step sintering technique was proved to be an effective approach to prepare functional ceramics with high Ga concentration, and Y 3 Ga 5 O 12 (YGG) transparent ceramic was successfully prepared for the first time. According to the variation of Al/Ga ratio, regulation of band structure and luminescence properties of YAGG:Ce transparent ceramics were effectively investigated. When Ga substitutes Al sites, the tetrahedral site is more favorable compared to the octahedral site for Ga to occupy according to the first-principle calculation. A continuous blue shift of the emission from 565 to 515 nm was achieved as Ga was gradually introduced into Y 3 Al 5 O 12 :Ce matrix. High quality green light was obtained by coupling the YAGG:Ce ceramics with commercial blue InGaN chips. Transparent luminescence ceramics accomplished in this work can be quite prospective for high power LED application.

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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. In the detection part a quartz collection lens, Thorlabs FB550–40 (550 nm/40 nm FWHM) dielectric bandpass filter, and a Hamamatsu R7056 fast PMT operated in the direct current mode were used to detect scintillation light.…”

Section: Methodsmentioning

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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Optical and scintillation properties of Ce 3+ -doped YGd 2 Al 5−x Ga x O 12 ( x =2,3,4) single crystal scintillators

Cited by 33 publications

References 38 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

YAGG:Ce transparent ceramics with high luminous efficiency for solid-state lighting application

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

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