Luminescence and scintillation characteristics of (GdxY3-x)Al2Ga3O12:Ce (x = 1,2,3) single crystals

Chewpraditkul, Warut; Pattanaboonmee, Nakarin; Sakthong, Ongsa; Chewpraditkul, Weerapong; Szczesniak, T.; Moszyński, M.; Kamada, Kei; Yoshikawa, Akira; Nikl, M.

doi:10.1016/j.optmat.2017.12.025

Cited by 21 publications

(6 citation statements)

References 45 publications

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“…The absorbance spectra of the Ce/GGAG crystals with and without the post-air annealing process are presented in Figure . The sharp absorbance peaks at around 270 and 320 nm could be attributed to 8 S 7/2 – 6 I x and 8 S 7/2 – 6 p x transitions of Gd 3+ ions, , respectively. Characteristic absorptions originating from the 4f–5d 1 (450 nm) and 4f–5d 2 (345 nm) transitions of Ce 3+ basically deepened with the increase of Ce concentrations, especially for crystals with the post-air annealing process.…”

Section: Resultsmentioning

confidence: 96%

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: Resultsmentioning

confidence: 96%

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

Wang

Shi

et al. 2021

Crystal Growth & Design

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“…Such complex compositions are usually called 'high-entropy' or 'multicomponent' (Djenadic et al, 2017;Pianassola, Loveday, McMurray et al, 2020;Karati et al, 2021;Sun et al, 2020). Admixing two or three elements in garnet crystals has been shown to improve scintillation properties (Kamada et al, 2011(Kamada et al, , 2014Prusa et al, 2013;Chewpraditkul et al, 2018). Therefore, multicomponent crystals could lead to further improvement in performance for radiation detection in medical imaging and homeland security applications.…”

Section: Introductionmentioning

confidence: 99%

Effects of composition and growth parameters on phase formation in multicomponent aluminum garnet crystals

Pianassola¹,

Alexander²,

Chakoumakos³

et al. 2022

Acta Crystallogr Sect B

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The effects of composition on the phase formation of multicomponent garnet crystals grown via directional solidification by the micro-pulling-down method are studied. A relatively wide range of rare-earth (RE) average ionic radii (AIR) is explored by formulating ten compositions from the system (Lu,Y,Ho,Dy,Tb,Gd)3Al5O12. Crystals were grown at either 0.05 or 0.20 mm min−1. The hypothesis is that multicomponent compounds with large AIR will form secondary phases as the single-RE aluminum garnets formed by larger Tb3+ or Gd3+; this will result in crystals of poor optical quality. Crystals with large AIR have a central opaque region in optical microscopy images, which is responsible for their reduced transparency compared to crystals with small AIR. Slow pulling rates suppress the formation of the opaque region in crystals with intermediate AIR. Powder and single-crystal X-ray diffraction and electron probe microanalysis results indicate that the opaque region is a perovskite phase. Scanning electron microscopy and energy dispersive spectroscopy measurements reveal eutectic inclusions at the outer surface of the crystals. The concentration of the eutectic inclusions increases with increasing AIR.

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“…[1][2][3] Compared with YAG (4.56 g cm −3 ) and LuAG (6.7 g cm −3 ), GdAG (5.97 g cm −3 ) is also heavy enough to stop the emitted high energy rays or particles efficiently. In addition, the lower electronegativity of Gd 3+ (χ = 1.20) is more conducive to the formation of covalent GdAG lattices than that of YAG, which may produce new emission properties [4][5][6] or sensitize Eu 3+ , 7,8 Ce 3+ , 6,9 Tb 3+ (ref. 10 and 11) ions to enhance the luminescence intensity.…”

Section: Introductionmentioning

confidence: 99%

Stable growth of (Ce,Gd)₃Ga₂Al₃O₁₂ crystal scintillators by the traveling solvent floating zone method

Wang

Shi

et al. 2022

CrystEngComm

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Luminescence and scintillation characteristics of (GdxY3-x)Al2Ga3O12:Ce (x = 1,2,3) single crystals

Cited by 21 publications

References 45 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

Effects of composition and growth parameters on phase formation in multicomponent aluminum garnet crystals

Stable growth of (Ce,Gd)₃Ga₂Al₃O₁₂ crystal scintillators by the traveling solvent floating zone method

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Luminescence and scintillation characteristics of (GdxY3-x)Al2Ga3O12:Ce (x = 1,2,3) single crystals

Cited by 21 publications

References 45 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

Effects of composition and growth parameters on phase formation in multicomponent aluminum garnet crystals

Stable growth of (Ce,Gd)3Ga2Al3O12 crystal scintillators by the traveling solvent floating zone method

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

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

Stable growth of (Ce,Gd)₃Ga₂Al₃O₁₂ crystal scintillators by the traveling solvent floating zone method