Effect of thermal annealing on scintillation properties of Ce:Gd2Y1Ga2.7Al2.3O12 under different atmosphere

Wang, Chao; Ding, Derui; Wu, Yuntao; Li, Huanying; Chen, Xiaofeng; Shi, Jian Lin; Wang, Qingqing; Ye, Le; Ren, Guohao

doi:10.1007/s00339-017-0997-z

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…Annealing in an oxidizing atmosphere, which can effectively reduce the concentration of oxygen vacancies and related electron traps, is an important process in the fabrication of both Ce:LuAG single crystals and ceramics. Indeed, the air annealed crystals and ceramics of different scintillators showed light yield increase and reduced contribution of slow components in the scintillation decay. Such improvements are crucial for the optimization of all inorganic oxide materials.…”

Section: Introductionmentioning

confidence: 99%

The influence of air annealing on the microstructure and scintillation properties of Ce,Mg:LuAG ceramics

Chen

Dai

et al. 2018

J Am Ceram Soc

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The microstructures and optical properties of Ce,Mg:Lu3Al5O12 scintillator ceramics are investigated with particular focus on the effect of postannealing in air from 1000 to 1450°C. The formation of Al2O3 clusters after annealing above 1300°C is evidenced by scanning electron microscopy. The presence of this secondary phase is tentatively explained by the occurrence of Ce and Mg evaporation, proved by inductive coupled plasma optical emission spectrometry measurements, followed by defect diffusion and clustering during high temperature annealing. Meanwhile, optical investigations including absorption, X‐ray induced luminescence, light yield, scintillation decay, and thermoluminescence prove the positive role of post‐annealing that leads to a brighter and faster scintillation emission. This behavior is associated to the removal of oxygen vacancies occurring during such treatments. In parallel, the partial conversion of Ce3+ ions into Ce4+ is also observed as a consequence of annealings and the role of Ce4+ ions in the scintillation process is discussed.

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Section: Introductionmentioning

confidence: 99%

The influence of air annealing on the microstructure and scintillation properties of Ce,Mg:LuAG ceramics

Chen

Dai

et al. 2018

J Am Ceram Soc

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“…For example, the emission of the aggregates was primarily observed at low temperatures, and a slight low-energy shift in most emission bands occurred with the increasing temperature [64]. In addition to alkali metal halides, the annealing process was also reported to improve the luminescent efficiency in other types of scintillators [65][66][67].…”

Section: Photoluminescence Of Nai Films On a Glass Substratementioning

confidence: 99%

Photoluminescence of Cesium-Doped Sodium Iodide Films Irradiated by UV LED

Wu,

Kuan,

et al. 2023

Nanomaterials

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Alkali metal halides have long been used as scintillators for applications as sensors and detectors. Usually, a small amount of impurities are added to these inorganic materials to improve their luminescence efficiencies. We investigate the structures and luminescent properties of un-doped sodium iodide (NaI) and cesium-doped NaI (NaI:Cs) films deposited by thermal vacuum evaporation. Instead of using the toxic element thallium (Tl), we introduced cesium dopant into NaI. This is the first study for the NaI:Cs film excited by UV LED’s ultraviolet C (273 nm, 4.54 eV). The luminescence spectra show two main peaks at 3.05 and 4.32/3.955 eV (for fused silica/B270 substrate), originating from the intrinsic defects and/or activator excited states and the intrinsic self-trapped excitons (STEs), respectively. In general, both Cs-doping and post-annealing processes enhance the luminescence performance of NaI films.

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“…Thermal annealing in an oxidizing atmosphere is an effective way to eliminate the oxygen vacancies and increase the number of the Ce 4+ fast luminescence centers, resulting in higher LY, faster scintillation decay, and lower afterglow level [105,260]. Thermal annealing is very commonly used in the ceramic preparation and is also applied to enhance the scintillation performance of the single crystals [261,262]. When combining the HIP post-treatment with annealing, the compressed pores produced in the HIP process may swell in the annealing, causing a decrease in the optical transmittance of the ceramics.…”

Section: Comparison Of Garnet Ceramics and Single Crystalsmentioning

confidence: 99%

Development and prospects of garnet ceramic scintillators: A review

et al. 2022

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Garnet ceramic scintillators are a class of inorganic scintillation materials with excellent overall performance. The flexibility of cation substitution in different lattice positions leads to tunable and versatile properties and a wide range of applications. This paper starts with an overview of the development history of the inorganic scintillation materials, followed by a description of major preparation methods and characterization of garnet scintillation ceramics. Great progress obtained in recent years consisting in applying the band-gap and defect engineering strategies to the garnet scintillation ceramics is reviewed. Finally, the respective problems in the preparation and performance of multicomponent garnet single crystals and ceramics and the effective solutions are discussed. The garnet scintillation ceramics with the highest application potential are summarized, and the future development directions are proposed.

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Effect of thermal annealing on scintillation properties of Ce:Gd2Y1Ga2.7Al2.3O12 under different atmosphere

Cited by 9 publications

References 34 publications

The influence of air annealing on the microstructure and scintillation properties of Ce,Mg:LuAG ceramics

The influence of air annealing on the microstructure and scintillation properties of Ce,Mg:LuAG ceramics

Photoluminescence of Cesium-Doped Sodium Iodide Films Irradiated by UV LED

Development and prospects of garnet ceramic scintillators: A review

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