Growth and emission properties of Sc, Pr, and Ce co-doped Lu3Al5O12 epitaxial layers for scintillators

Kučera, Miroslav; Nikl, M.; Průša, P.; Mareš, J.; Nitsch, K.; Hanuš, Martin; Onderišinová, Zuzana; Kučerková, Romana

doi:10.1016/j.jcrysgro.2010.11.140

Cited by 15 publications

(3 citation statements)

References 20 publications

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“…In any case, the minimum thickness is about 5 um. To lower manufacturing costs of screens and increase their dimensions, one can produce thin single crystalline films by the liquid phase epitaxy (LPE) method. − Moreover, LPE screens can be prepared even thinner compared to mechanically polished ones, which may further improve the 2D resolution in the images.…”

Section: Introductionmentioning

confidence: 99%

Composition Tailoring in Ce-Doped Multicomponent Garnet Epitaxial Film Scintillators

Průša

Kučera

Mareš

et al. 2015

Crystal Growth & Design

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Bulk single crystals of multicomponent garnet scintillators Lu3–x Gd x Ga y Al5–y O12:Ce exhibit much improved scintillation properties in optimized composition islands (x = 2–3, y = 2–3) compared to the simple Lu3Al5O12:Ce one. Namely, a much higher light yield, less intense slow component in the scintillation response, and better energy resolution have been achieved. This work shows that comparable enhancement of the scintillation performance can be reached also in the case of epitaxial garnet films of similar composition though the nature of trapping states acting in the transfer stage of the scintillation mechanism may be different. This is the first time that excellent scintillation properties were reproduced in epitaxial films. Lu3–x Gd x Ga y Al5–y O12:Ce samples were grown by liquid phase epitaxy from BaO-B2O3–BaF2 flux and quantitatively compared with top performance bulk crystals as concerns light yield, energy resolution, scintillation decay, and afterglow characteristics. Reported characteristics point to the potential of such thin film scintillators in high resolution two-dimensional imaging and particle beam diagnostics.

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Section: Introductionmentioning

confidence: 99%

Composition Tailoring in Ce-Doped Multicomponent Garnet Epitaxial Film Scintillators

Průša

Kučera

Mareš

et al. 2015

Crystal Growth & Design

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“…Let us consider the origin of the STE. In the literature, , the STE emission at ∼4.59 eV (270 nm) in Lu 3 Al 5 O 12 :Sc is ascribed to the excitons localized around the Sc site. Zorenko proposed that the TE in YAlO 3 :Sc emitting at about 290 nm is formed from the 2p-type hole localized at the singly charged O – ions and electron localized at the mixed 3p-states of Al 3+ and 3d-states of Sc 3+ .…”

Section: Resultsmentioning

confidence: 92%

Study on the Luminescence and Energy Level of Lanthanide Ions in Lu_0.8Sc_0.2BO₃ Host

Ren

Nikl

et al. 2011

J. Phys. Chem. A

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Emission and excitation spectra of undoped and Ln(3+) (Ln = Ce, Pr, Nd, Yb)-doped Lu(0.8)Sc(0.2)BO(3) were studied by vacuum ultraviolet spectroscopy, and the X-ray excited luminescence spectra were measured as well at room temperature. The undoped specimen presented two different emissions upon excitation at energies in the vicinity of the band gap or with X-ray. The emission at the highest energy side, located at 4.77 eV, was ascribed to self-trapped exciton, which is anchored by electron capture around the Sc site. We also observed three broad emission bands at 4.43, 3.02, and 2.10 eV, which might be attributed to the trapped exciton, defect -related emissions, or both. Energy transfer processes to the doped lanthanide ions in Lu(0.8)Sc(0.2)BO(3) via exciton state or sequential electron-hole capture are discussed. Finally, the energy level diagram for divalent and trivalent lanthanides in Lu(0.8)Sc(0.2)BO(3) was constructed using the obtained spectroscopic parameters and the three parameters method (Dorenbos, P. J. Phys.: Condens. Matter 2003, 15, 8417).

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“…An additional emission band peaking at 5.6 eV appears in Al 2 O 3 doped with Sc, whereas it is attributed to electron recombination with holes localized at oxygen ions near Sc 3+ centers [ 47 ]. The spectra of Sc-doped LuAG demonstrate an emission band peaking in the region 265–290 nm, which originates from radiative recombination of an exciton situated near Sc 3+ [ 48 ]. The decay characteristics of Sc emission in LuAG as well as in some other garnets have been studied in [ 49 ].…”

Section: Resultsmentioning

confidence: 99%

Bright UV-C Phosphors with Excellent Thermal Stability—Y1−xScxPO4 Solid Solutions

et al. 2022

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The structural and luminescence properties of undoped Y1−xScxPO4 solid solutions have been studied. An intense thermally stable emission with fast decay (τ1/e ~ 10−7 s) and a band position varying from 5.21 to 5.94 eV depending on the Sc/Y ratio is detected and ascribed to the 2p O-3d Sc self-trapped excitons. The quantum yield of the UV-C emission, also depending on the Sc/Y ratio, reaches 34% for the solid solution with x = 0.5 at 300 K. It is shown by a combined analysis of theoretical and experimental data that the formation of Sc clusters occurs in the solid solutions studied. The clusters facilitate the creation of energy wells at the conduction band bottom, which enables deep localization of electronic excitations and the creation of luminescence centers characterized by high quantum yield and thermal stability of the UV-C emission.

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Growth and emission properties of Sc, Pr, and Ce co-doped Lu3Al5O12 epitaxial layers for scintillators

Cited by 15 publications

References 20 publications

Composition Tailoring in Ce-Doped Multicomponent Garnet Epitaxial Film Scintillators

Composition Tailoring in Ce-Doped Multicomponent Garnet Epitaxial Film Scintillators

Study on the Luminescence and Energy Level of Lanthanide Ions in Lu_0.8Sc_0.2BO₃ Host

Bright UV-C Phosphors with Excellent Thermal Stability—Y1−xScxPO4 Solid Solutions

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Growth and emission properties of Sc, Pr, and Ce co-doped Lu3Al5O12 epitaxial layers for scintillators

Cited by 15 publications

References 20 publications

Composition Tailoring in Ce-Doped Multicomponent Garnet Epitaxial Film Scintillators

Composition Tailoring in Ce-Doped Multicomponent Garnet Epitaxial Film Scintillators

Study on the Luminescence and Energy Level of Lanthanide Ions in Lu0.8Sc0.2BO3 Host

Bright UV-C Phosphors with Excellent Thermal Stability—Y1−xScxPO4 Solid Solutions

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Product

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About

Study on the Luminescence and Energy Level of Lanthanide Ions in Lu_0.8Sc_0.2BO₃ Host