GAGG:Ce composite scintillator for X-ray imaging

Gerasymov, Iaroslav; Nepokupnaya, T.; Boyarintsev, A.; Sidletskiy, O.; Kurtsev, D.; Voloshyna, O.; Trubaieva, O. G.; Boyarintseva, Y.; Sibilieva, T.; Shaposhnyk, Anna; Opolonin, Oleksandr D.; Tretyak, S.

doi:10.1016/j.optmat.2020.110305

Cited by 25 publications

(22 citation statements)

References 25 publications

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“…In a previous study on 0.02−0.9 at. % Ce/GGAG composite phosphors, 8 the maximum XEL intensity is found to be observed at around 0.12 at.% Ce/GGAG. Considering the segregation coefficient [K(Ce 3+ ) = 0.36] in GGAG crystals, 1,20 we calculated the segregation coefficient of our crystals according to…”

Section: ■ Results and Discussionmentioning

confidence: 89%

Fast (Ce,Gd)₃Ga₂Al₃O₁₂ Scintillators Grown by the Optical Floating Zone Method

Wang

Shi

et al. 2021

Crystal Growth & Design

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A series of (Ce x Gd 1−x ) 3 Ga 2 Al 3 O 12 (x = 0−0.8%) (Ce/GGAG) crystals were grown by the optical floating zone (OFZ) method. Ce/GGAG single crystals with good crystallinity were successfully obtained by introducing oxygen atmosphere (100%) and auxiliary pressure (0.3 MPa) to suppress Ga 2 O 3 volatilization in a container-free environment. The photoluminescence (PL) and scintillation properties of those Ce/GGAG crystals with different Ce 3+ doping concentrations were investigated. In the 0.2−0.8 at. % Ce concentration range, the integral PL intensities were found to vary according to the approximate Gaussian distribution with Ce concentration, and the 0.6 at. % Ce/GGAG crystal has the highest integral PL intensity. Gd 3+ emission was observed under X-ray excitation, which was rarely reported before. The maximum light yield reaches to 38,848 pho/ MeV in the 0.6 at. % Ce/GGAG crystal. More importantly, fast decay and high ratio of the fast component (71 ns 66%) were successfully obtained in Ce/GGAG crystals with a Ga/Al = 2/3 ratio, which might be attributed to the suppression of composition deviation by introducing O 2 (100%) atmosphere during crystal growth. It indicates that the optical floating zone method is effective in the composition engineering study of Ce/GGAG crystals to optimize the scintillation performance.

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Section: ■ Results and Discussionmentioning

confidence: 89%

Fast (Ce,Gd)₃Ga₂Al₃O₁₂ Scintillators Grown by the Optical Floating Zone Method

Wang

Shi

et al. 2021

Crystal Growth & Design

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“…Meanwhile, new prospects in engineering of the garnet composite scintillators have been opened with the development of the bulk crystals of mixed (Lu,Gd,Tb) 3 (Al,Ga) 5 O 12 garnets possessing much higher light output even over 50,000 photon/MeV [ 43 , 44 , 45 ]. Nowadays, Ce-doped mixed garnets are among the most extensively developed garnet scintillators [ 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ]. The focus of the recent studies was concentrated on mixed systems with the first (Lu,Gd,Tb) and second (Al,Ga) cation substitutions ( Figure 2 a).…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the substitution of Lu 3+ cations by the large R = Gd 3+ or Tb 3+ ions in the (Lu x R 1−x ) 3 Al 5−y Ga y O 12 :Ce lattice results in a red emission shift and in increased splitting of the lowest doublet 5d state of Ce 3+ with respect to conduction band bottom ( Figure 2 b), as well as in changing the rates of intra-center and extra-center energy relaxation to Ce 3+ -emitting ions [ 48 , 50 ]. Finally, such double cation substitutions lead to strong increasing LY mixed garnet scintillators with respect to “simple” LuAG:Ce and YAG:Ce garnets [ 43 , 50 , 55 ].…”

Section: Introductionmentioning

confidence: 99%

Composite Detectors Based on Single-Crystalline Films and Single Crystals of Garnet Compounds

et al. 2022

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This manuscript summarizes recent results on the development of composite luminescent materials based on the single-crystalline films and single crystals of simple and mixed garnet compounds obtained by the liquid-phase epitaxy growth method. Such composite materials can be applied as scintillating and thermoluminescent (TL) detectors for radiation monitoring of mixed ionization fluxes, as well as scintillation screens in the microimaging techniques. The film and crystal parts of composite detectors were fabricated from efficient scintillation/TL materials based on Ce3+-, Pr3+-, and Sc3+-doped Lu3Al5O12 garnets, as well as Ce3+-doped Gd3−xAxAl5−yGayO12 mixed garnets, where A = Lu or Tb; x = 0–1; y = 2–3 with significantly different scintillation decay or positions of the main peaks in their TL glow curves. This work also summarizes the results of optical study of films, crystals, and epitaxial structures of these garnet compounds using absorption, cathodoluminescence, and photoluminescence. The scintillation and TL properties of the developed materials under α- and β-particles and γ-quanta excitations were studied as well. The most efficient variants of the composite scintillation and TL detectors for monitoring of composition of mixed beams of ionizing radiation were selected based on the results of this complex study.

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“…The scintillator crystals with garnet structure have been proved to possess good chemical stability, high lattice isomorphic capacity and effective conversion of high energy ionizing radiation to visible luminescence when doped with luminescent rare earth ions in the host [ 1 , 2 ]. Those various garnet structure compounds, when coupling with photodetectors, are widely used for applications in industry inspection, nuclear medicine, and high energy physics [ 3 , 4 ]. Ce 3+ doped Gd 3 (Ga, Al) 5 O 12 (GGAG) is considered a promising new generation of scintillators in view of its allowed electric dipole 5d–4f transition, high theoretical light yield (LY), i.e., 73,500 pho/MeV [ 5 ], high density (6.63 g/cm 3 ) and effective atomic number (Z eff = 54), as well as hard radiation hardness performance [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Wide Concentration Range of Tb3+ Doping Influence on Scintillation Properties of (Ce, Tb, Gd)3Ga2Al3O12 Crystals Grown by the Optical Floating Zone Method

Shi

Huang

et al. 2022

Materials

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To obtain a deeper understand of the energy transfer mechanism between Ce3+ and Tb3+ ions in the aluminum garnet hosts, (Ce, Tb, Gd)3Ga2Al3O12 (GGAG:Ce, Tb) single crystals grown by the optical floating zone (OFZ) method were investigated systematically in a wide range of Tb3+ doping concentration (1–66 at.%). Among those, crystal with 7 at.% Tb reached a single garnet phase while the crystals with other Tb3+ concentrations are mixed phases of garnet and perovskite. Obvious Ce and Ga loss can be observed by an energy dispersive X-ray spectroscope (EDS) technology. The absorption bands belonging to both Ce3+ and Tb3+ ions can be observed in all crystals. Photoluminescence (PL) spectra show the presence of an efficient energy transfer from the Tb3+ to Ce3+ and the gradually quenching effect with increasing of Tb3+ concentration. GGAG: 1% Ce3+, 7% Tb3+ crystal was found to possess the highest PL intensity under excitation of 450 nm. The maximum light yield (LY) reaches 18,941 pho/MeV. The improved luminescent and scintillation characteristics indicate that the cation engineering of Tb3+ can optimize the photoconversion performance of GGAG:Ce.

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GAGG:Ce composite scintillator for X-ray imaging

Cited by 25 publications

References 25 publications

Fast (Ce,Gd)₃Ga₂Al₃O₁₂ Scintillators Grown by the Optical Floating Zone Method

Fast (Ce,Gd)₃Ga₂Al₃O₁₂ Scintillators Grown by the Optical Floating Zone Method

Composite Detectors Based on Single-Crystalline Films and Single Crystals of Garnet Compounds

Wide Concentration Range of Tb3+ Doping Influence on Scintillation Properties of (Ce, Tb, Gd)3Ga2Al3O12 Crystals Grown by the Optical Floating Zone Method

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GAGG:Ce composite scintillator for X-ray imaging

Cited by 25 publications

References 25 publications

Fast (Ce,Gd)3Ga2Al3O12 Scintillators Grown by the Optical Floating Zone Method

Fast (Ce,Gd)3Ga2Al3O12 Scintillators Grown by the Optical Floating Zone Method

Composite Detectors Based on Single-Crystalline Films and Single Crystals of Garnet Compounds

Wide Concentration Range of Tb3+ Doping Influence on Scintillation Properties of (Ce, Tb, Gd)3Ga2Al3O12 Crystals Grown by the Optical Floating Zone Method

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Product

Resources

About

Fast (Ce,Gd)₃Ga₂Al₃O₁₂ Scintillators Grown by the Optical Floating Zone Method

Fast (Ce,Gd)₃Ga₂Al₃O₁₂ Scintillators Grown by the Optical Floating Zone Method