Fabrication and characterization of pixelated Gd2O2S:Tb scintillator screens for digital X-ray imaging applications

Kim, Jong-Yul; Kyoung, Bo; Bae, Jinho; Lee, Chaehun; Kim, Hyung-Taek; Chang, Sung-Ho; Cho, Gyuseong; Sim, Cheul Muu; Kim, Taejoo

doi:10.1016/j.nima.2010.06.196

Cited by 15 publications

(9 citation statements)

References 4 publications

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“…17 On the other hand, Gd 2 O 2 S:Tb phosphor is widely used for display purposes in TV screens, CRT tubes, 18 and X-ray intensifying screens 19 due to its highly bright and efficient green emission under UV, cathode ray, and X-ray excitations. 20 Gd 2 O 2 S:Tb scintillator is useful in X-ray imaging and neutron radiography, 21,22 since it exhibits substantially better light output than the classic ZnS(Ag)/LiF material [21][22][23] by its much higher neutron capture cross-section and intrinsic conversion efficiency (~20%).…”

mentioning

confidence: 99%

Photo/cathodoluminescence and stability of Gd₂O₂S:Tb,Pr green phosphor hexagons calcined from layered hydroxide sulfate

Wang

et al. 2018

J Am Ceram Soc

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Hydrothermal reaction at 150°C and pH = 10 for 24 hours crystallized (Gd,RE)2(OH)4SO4 layered hydroxide sulfate (monoclinic structure; RE = Pr, Tb), from which Gd2O2S:RE (hexagonal structure) green phosphor hexagons were derived via facile dehydration in flowing H2 at 1200°C. Rietveld refinement of the XRD patterns yielded cell dimensions that confirmed the direct crystallization of solid solution. Photoluminescence (PL) study at room temperature found absolute quantum yields of ~25.1% and 28.4%, CIE chromaticity coordinates of (0.145, 0.679) and (0.326, 0.566), and fluorescence lifetimes of ~2.36 μs and 1.21 ms for Pr3+ and Tb3+ under 300 and 275 nm UV excitations, respectively. Temperature‐dependent PL analysis (25‐200°C) indicated that both the Pr3+‐ and Tb3+‐doped phosphors have favorably good thermal stability and retained ~65% and 80% at 100°C and ~41% and 47% at 200°C of their initial emission intensities, respectively. The activation energy for the thermal quenching of PL was determined to be ~0.221 (Pr3+) and 0.314 eV (Tb3+). Cathodoluminescence (CL) found that both the phosphors exhibit increasingly higher emission intensity/brightness at a higher acceleration voltage (up to 7 kV) or beam current (up to 50 μA) and are stable under electron bombardment in the studied range. Raising beam current was suggested to be more effective to enhance CL.

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confidence: 99%

Photo/cathodoluminescence and stability of Gd₂O₂S:Tb,Pr green phosphor hexagons calcined from layered hydroxide sulfate

Wang

et al. 2018

J Am Ceram Soc

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“…Terbium‐doped GOS (GOS:Tb) is a green phosphor widely used in TV screens, CRT tubes, and X‐ray intensifying screens, due to its efficient and bright luminescence under ultraviolet (UV), cathode ray, and X‐ray excitation . As a scintillator, GOS:Tb is advantageous over the classic ZnS(Ag)/LiF material for X‐ray imaging and neutron radiography, owing to its larger neutron capture cross section and higher intrinsic conversion efficiency (~20%).…”

Section: Introductionmentioning

confidence: 99%

A low temperature approach for photo/cathodoluminescent Gd₂O₂S:Tb (GOS:Tb) nanophosphors

Wang

Meng

et al. 2018

J Am Ceram Soc

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Titrating the aqueous solution of equimolar RE(NO3)3 and (NH4)2SO4 with NH4OH to pH~9 at ~4°C produced an amorphous precursor that yielded phase‐pure and well‐dispersed RE2O2S nanopowder (RE = Gd0.99Tb0.01; GOS:Tb) via a RE2O2SO4 intermediate upon annealing in H2. The powders calcined at the typical temperatures of 700/1200°C exhibited unimodal size distributions and have the average crystallize sizes of ~17/55 nm, average particle sizes of ~284/420 nm, and specific surface areas of ~14.62/4.53 m2/g (equivalent particle sizes: ~56/180 nm). The 1200°C product exhibited sharp green luminescence at ~544 nm (FWHM = 2.3 nm; λex = 275 nm), with an absolute quantum yield of ~24.8% and a fluorescence lifetime of ~1.34 ms at room temperature. It was also shown that the powder possesses favorable thermal stability (the activation energy for thermal quenching of luminescence ~0.305 eV) and is stable under electron beam irradiation up to 7 kV and 50 μA. The synthetic technique has the advantages of scalability and favorable dispersion and high chemical/phase purity for GOS powder, which may allow the sintering of scintillation ceramics at lower temperatures.

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“…One of the most interesting RE 2 O 2 S is the terbium‐doped gadolinium oxysulfide NPs—Gd 2 O 2 S:Tb 3+ (GOSNPs), which is a photoluminescent phosphor used as an optical device in solid‐state lasers, screens for X‐ray detection, optical amplifiers, and color displays …”

Section: Introductionmentioning

confidence: 99%

“…12,13 One of the most interesting RE 2 O 2 S is the terbium-doped gadolinium oxysulfide NPs-Gd 2 O 2 S:Tb 31 (GOSNPs), which is a photoluminescent phosphor used as an optical device in solid-state lasers, screens for X-ray detection, optical amplifiers, and color displays. [14][15][16] . GOSNPs are characterized by their high density (7.44 g/cm 23 ), which improves UV-photon absorption.…”

Section: Introductionmentioning

confidence: 99%

Toxicity evaluation of high-fluorescent rare-earth metal nanoparticles for bioimaging applications

Hernández‐Adame

Cortez-Espinosa

Portales-Pérez

et al. 2015

J. Biomed. Mater. Res.

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Research on nanometer-sized luminescent semiconductors and their biological applications in detectors and contrasting agents is an emergent field in nanotechnology. When new nanosize technologies are developed for human health applications, their interaction with biological systems should be studied in depth. Rare-earth elements are used in medical and industrial applications, but their toxic effects are not known. In this work, the biological interaction between terbium-doped gadolinium oxysulfide nanoparticles (GOSNPs) with human peripheral blood mononuclear cells (PBMC), human-derived macrophages (THP-1), and human cervical carcinoma cell (HeLa) were evaluated. The GOSNPs were synthetized using a hydrothermal method to obtain monodisperse nanoparticles with an average size of 91 ± 9 nm. Characterization techniques showed the hexagonal phase of the Gd O S:Tb free of impurities, and a strong green emission at λ = 544 nm produced by Tb was observed. Toxic effects of GOSNPs were evaluated using cell viability, apoptosis, cell-cycle progression, and immunological response techniques. In addition, an Artemia model was used to assess the toxicity in vivo. Results indicated cell apoptosis in both types of cells with less sensitivity for PBMC cells compared to HeLa cells. In addition, no toxic effects were observed in the in vivo model of Artemia. Moreover, GOSNPs significantly reduced the activation and cell-cycle progression of PBMC and HeLa cells, respectively. Interestingly, an increase in proinflammatory cytokines was not observed. Our data suggest that fluorescence applications of GOSNPs for biolabeling are not toxic in primary immune cells and they may have an immunomodulatory effect. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 605-615, 2017.

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Fabrication and characterization of pixelated Gd2O2S:Tb scintillator screens for digital X-ray imaging applications

Cited by 15 publications

References 4 publications

Photo/cathodoluminescence and stability of Gd₂O₂S:Tb,Pr green phosphor hexagons calcined from layered hydroxide sulfate

Photo/cathodoluminescence and stability of Gd₂O₂S:Tb,Pr green phosphor hexagons calcined from layered hydroxide sulfate

A low temperature approach for photo/cathodoluminescent Gd₂O₂S:Tb (GOS:Tb) nanophosphors

Toxicity evaluation of high-fluorescent rare-earth metal nanoparticles for bioimaging applications

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Fabrication and characterization of pixelated Gd2O2S:Tb scintillator screens for digital X-ray imaging applications

Cited by 15 publications

References 4 publications

Photo/cathodoluminescence and stability of Gd2O2S:Tb,Pr green phosphor hexagons calcined from layered hydroxide sulfate

Photo/cathodoluminescence and stability of Gd2O2S:Tb,Pr green phosphor hexagons calcined from layered hydroxide sulfate

A low temperature approach for photo/cathodoluminescent Gd2O2S:Tb (GOS:Tb) nanophosphors

Toxicity evaluation of high-fluorescent rare-earth metal nanoparticles for bioimaging applications

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Photo/cathodoluminescence and stability of Gd₂O₂S:Tb,Pr green phosphor hexagons calcined from layered hydroxide sulfate

Photo/cathodoluminescence and stability of Gd₂O₂S:Tb,Pr green phosphor hexagons calcined from layered hydroxide sulfate

A low temperature approach for photo/cathodoluminescent Gd₂O₂S:Tb (GOS:Tb) nanophosphors