Gd2O2S:Tb scintillation ceramics fabricated from high sinterability nanopowders via hydrogen reduction

Liu, Qiang; Pan, Hongming; Chen, Xiaopu; Li, Xiaoying; Liu, Xin; Li, Wei; Hu, Zhijuan; Zhang, Xing; Wu, Lexiang; Li, Jiang

doi:10.1016/j.optmat.2019.05.022

Cited by 21 publications

(14 citation statements)

References 26 publications

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“…Scintillators have broad applications in space exploration, security inspection, and medical radiography. − Most applied X-ray detectors to date are based on an indirect scintillating process. , Exemplary scintillators include thallium-doped cesium iodide (CsI:Tl) − and cerium-doped lutetium yttrium orthosilicate (Lu 1.8 Y 0.2 SiO 5 -Ce, LYSO). − Besides the toxicity of Tl and the high cost of Lu, the preparation of CsI:Tl films requires a time-consuming vacuum process, and LYSO crystals require high-temperature processing (>1000 °C), causing a manufacturing inconvenience and cost. − Therefore, there is an endeavor for the development of new materials prepared at relatively low temperatures.…”

mentioning

confidence: 99%

All-Inorganic Copper Halide as a Stable and Self-Absorption-Free X-ray Scintillator

Zhao

Niu

Zhu

et al. 2020

J. Phys. Chem. Lett.

161

159

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Lead halide perovskites have recently shown great potential as X-ray scintillators; however, the toxicity of the lead element seriously restricts their applications. Herein we report a new lead-free and self-absorption-free scintillator based on Rb 2 CuCl 3 metal halide. The Rb 2 CuCl 3 exhibits a near-unity photoluminescence quantum yield (99.4%) as well as a long photoluminescence lifetime (11.3 μs). Furthermore, Rb 2 CuCl 3 demonstrates an appreciable light yield of 16 600 photons per megaelectronvolt and a large scintillation response with a linear range from 48.6 nGy air s −1 to 15.7 μGy air s −1 . Notably, the detection limit is as low as 88.5 nGy air s −1 , enabling a reduced radiation dose to the human body when a medical and security check is conducted. In addition, Rb 2 CuCl 3 exhibits good stability against the atmosphere, continuous ultraviolet light, as well as X-ray irradiation. The combination of the decent scintillation performance, low toxicity and good stability suggests the Rb 2 CuCl 3 could be a possible promising X-ray scintillator.

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mentioning

confidence: 99%

All-Inorganic Copper Halide as a Stable and Self-Absorption-Free X-ray Scintillator

Zhao

Niu

Zhu

et al. 2020

J. Phys. Chem. Lett.

161

159

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“…6 Structure diagrams of precursor La2 (OH) 4SO4• nH2O and calcined products in different atmospheres [63] 近年来，辽宁石油化工大学连景宝团队 [67][68][69] [72] Fig. 8 Total transmittance curves of GOS ceramics (thickness 1.6 mm) prepared by hot pressing [72] 1-GOS:F ceramics; [58] Fig. 9 FESEM images of the fracture surfaces and EDS analysis [58] (a [78] Fig.…”

Section: Molecular Formula Gd2o2smentioning

confidence: 99%

“…8 Total transmittance curves of GOS ceramics (thickness 1.6 mm) prepared by hot pressing [72] 1-GOS:F ceramics; [58] Fig. 9 FESEM images of the fracture surfaces and EDS analysis [58] (a [78] Fig. 10 Microstructures of GOS ceramics prepared by pressureless sintering under different conditions [78] (a) 1380 ℃×6 h, 1.0 K/min; (b) 1300 ℃×3 h, 2.8 K/min 中国科学院上海硅酸研究所潘裕柏团队 [79] 将商 [79] Fig.…”

Section: Molecular Formula Gd2o2smentioning

confidence: 99%

Rare Earth Doped Gd₂O₂S Scintillation Ceramics

Li¹,

Ding²,

Huang³

2021

Journal of Inorganic Materials

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Rare earth ions doped Gd2O2S scintillators are the new type of oxysulfide scintillators, which have been developed since 1980s. The Gd2O2S matrix with high density and high thermal neutron absorption cross section has high X ray and thermal neutron stopping ability. The doping of different rare earth ions (Pr 3+ ,Tb 3+ , etc.) shows fast decay or high light yield, which plays a very important role in the application of scintillation. The composition control of oxysulfide is always the key problem to be solved in the synthesis process. However, the high melting point of Gd2O2S material and the serious volatilization of sulfur restrict the preparation of Gd2O2S single crystals, with high optical quality and excellent scintillation performance. Ceramic is the main application form of Gd2O2S scintillation material. The pure phase Gd2O2S phosphors with small particle size, narrow particle size distribution and low agglomeration is the key to sintering high quality scintillation ceramics. The Gd2O2S scintillation ceramics prepared by simply increasing the sintering temperature will produce a large number of sulfur vacancies and oxygen vacancies, which will reduce the scintillation properties of the materials. So the preparation of Gd2O2S scintillation ceramics usually need pressure assistance, which increases the production cost. In this paper, the scintillation mechanism and the research situation of scintillators are introduced firstly. Then, the fabrication process of Gd2O2S scintillation ceramics, the solution of defects removal, the research status and their applications in neutron imaging and medical X-CT fields are overviews. Finally, The whole paper is summarized and the development of Gd2O2S scintillation ceramics is also prospected.

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“…A ceramic scintillator is superior to a single crystal due to its low cost, short production cycle, large-size production, as well as high dopant concentration with a homogeneous mixture at the molecular level [ 6 , 7 , 8 , 9 ]. Solid-state Gd 2 O 2 S (GOS) has excellent chemical and physical characteristics, such as high melting point (2070 °C), high density (7.43 g/cm 3 ), high X-ray attenuation coefficient (~52 cm −1 at 70 keV), wide band gap (4.6–4.8 eV), favorable chemical durability, low phonon energy, low crystal symmetry, and low toxicity, which make it a promising host material for luminescence and scintillation applications [ 10 , 11 ]. GOS-based phosphors have attracted considerable attention for decades.…”

Section: Introductionmentioning

confidence: 99%

“…GOS belongs to the hexagonal crystal structure (space group:

ml ; lattice parameters: a = b = 0.3851 nm and c = 0.6664 nm) with trigonal symmetry [ 10 ]. Owing to its optically anisotropic structure, the sintered GOS ceramic is difficult to densify into a fully transparent body by sintering densification.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Green-Emitting Gd2O2S:Pr3+ Phosphor Nanoparticles and Fabrication of Translucent Gd2O2S:Pr3+ Scintillation Ceramics

2020

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A translucent Gd2O2S:Pr ceramic scintillator with an in-line transmittance of ~31% at 512 nm was successfully fabricated by argon-controlled sintering. The starting precipitation precursor was obtained by a chemical precipitation route at 80 °C using ammonia solution as the precipitate, followed by reduction at 1000 °C under flowing hydrogen to produce a sphere-like Gd2O2S:Pr powder with an average particle size of ~95 nm. The Gd2O2S:Pr phosphor particle exhibits the characteristic green emission from 3P0,1→3H4 transitions of Pr3+ at 512 nm upon UV excitation into a broad excitation band at 285–335 nm arising from 4f2→4f5d transition of Pr3+. Increasing Pr3+ concentrations induce two redshifts for the two band centers of 4f2→4f5d transition and lattice absorption on photoluminescence excitation spectra. The optimum concentration of Pr3+ is 0.5 at.%, and the luminescence quenching type is dominated by exchange interaction. The X-ray excited luminescence spectrum of the Gd2O2S:Pr ceramic is similar to the photoluminescence behavior of its particle. The phosphor powder and the ceramic scintillator have similar lifetimes of 2.93–2.99 μs, while the bulk material has rather higher external quantum efficiency (~37.8%) than the powder form (~27.2%).

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Gd2O2S:Tb scintillation ceramics fabricated from high sinterability nanopowders via hydrogen reduction

Cited by 21 publications

References 26 publications

All-Inorganic Copper Halide as a Stable and Self-Absorption-Free X-ray Scintillator

All-Inorganic Copper Halide as a Stable and Self-Absorption-Free X-ray Scintillator

Rare Earth Doped Gd₂O₂S Scintillation Ceramics

Synthesis of Green-Emitting Gd2O2S:Pr3+ Phosphor Nanoparticles and Fabrication of Translucent Gd2O2S:Pr3+ Scintillation Ceramics

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Gd2O2S:Tb scintillation ceramics fabricated from high sinterability nanopowders via hydrogen reduction

Cited by 21 publications

References 26 publications

All-Inorganic Copper Halide as a Stable and Self-Absorption-Free X-ray Scintillator

All-Inorganic Copper Halide as a Stable and Self-Absorption-Free X-ray Scintillator

Rare Earth Doped Gd2O2S Scintillation Ceramics

Synthesis of Green-Emitting Gd2O2S:Pr3+ Phosphor Nanoparticles and Fabrication of Translucent Gd2O2S:Pr3+ Scintillation Ceramics

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Rare Earth Doped Gd₂O₂S Scintillation Ceramics