Evaluation of Gd2O2S:Pr granular phosphor properties for X-ray mammography imaging

Stoppa, David; Michail, C.; Seferis, I.; Valais, I.; Fountos, G.; Liaparinos, P.; Kandarakis, I.; Kalyvas, N.

doi:10.1016/j.jlumin.2015.01.044

Cited by 24 publications

(30 citation statements)

References 14 publications

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“…Due to these remarkable features, this Gd 2 O 2 S:Eu 3+ nanophosphor is promising for various applications such as ceramic scintillation for devices and displays, multimodal imaging agents, mammography, X‐ray computed tomography for positrons, digital dental radiography, and light converters under radiographic imaging conditions . Hence, various approaches have been extensively investigated, especially to enhance the emission intensity and for better quantum efficiency including size, surface, and morphological control during preparation methods for desired device applications …”

Section: Introductionmentioning

confidence: 99%

Physical and optical studies of Gd₂O₂S:Eu³⁺ nanophosphors by microwave irradiation and γ‐irradiation methods

et al. 2019

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Gd 2 O 2 S:Eu 3+ nanophosphors have been successfully synthesized using microwave irradiation and γ-irradiation methods with polyvinyl pyrrolidone as a stabilizer. The physical and luminescence spectra were compared. The morphologies of both Gd 2 O 2 S:Eu 3+ nanophosphors were in the hexagonal phase and mainly consisted of spherical nanostructures with diameters of~90 nm and~50 nm for both microwave irradiation and γ-irradiation methods. Upon 325 nm of ultraviolet (UV) light excitation, strong red emissions (626 nm) were observed for both methods; these emissions corresponded to the 5 D 0 → 7 F 2 transition of Eu 3+ ions. However, Gd 2 O 2 S:Eu 3+ nanophosphors following microwave treatment showed better luminescence intensity than Gd 2 O 2 S:Eu 3+ nanophosphors treated with γ-irradiation. This difference was attributed to the crystallinity phase and surface quenching effects of Gd 2 O 2 S: Eu 3+ nanophosphors. The reaction mechanisms of Gd 2 O 2 S:Eu 3+ nanophosphors in both methods are discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Physical and optical studies of Gd₂O₂S:Eu³⁺ nanophosphors by microwave irradiation and γ‐irradiation methods

et al. 2019

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“…Praseodymium dopant can be considered as a suitable luminescent activator, because of its fast (a few tens of ns) 5d -4f transition leading to an emission band in the UV spectral region [12,13]. The properties of Pr 3+ ions incorporated in various crystalline matrices have been extensively investigated.…”

Section: Introductionmentioning

confidence: 99%

Optical properties and radiation hardness of Pr-doped sol-gel silica: Influence of fiber drawing process

Cova

Fasoli

Moretti

et al. 2017

Journal of Luminescence

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Optical properties and radiation hardness of Pr-doped sol-gel silica: Influence of fiber drawing process (2017) J. Lumin, vol. 192, p. 661-667 doi: 10.1016Lumin, vol. 192, p. 661-667 doi: 10. /j.jlumin.2017 Publisher's version of the article can be found at the following site: http://www.sciencedirect.com/science/article/pii/S0022231317307949 A complete and detailed characterization of the optical, scintillation and radiation hardness properties of Pr-doped silica is carried out employing different experimental techniques including steady-state and time-resolved photo-luminescence, radio-and thermo-luminescence, scintillation and optical absorption.Optical absorption measurements, performed after X-ray irradiation sequences up to 1 kGy, evidence the formation of radiation-induced absorption bands related to point defects acting as color centers. Spontaneous partial recovery of the radiation-induced defects at room temperature, as well as after thermal treatments, is also disclosed.Particular attention is paid to the comparison between bulk silica, both before and after a melting process, and fibers. The results reveal the presence of a lower concentration of optically active defects in melted glass. Such comparison highlights a role of the fiber drawing in modifying the glass defectiveness, consisting in the occurrence of a structural reorganization of the amorphous network during the process.

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“…The most traditionally used commercial scintillating materials are thallium doped cesium iodide (CsI:Tl), due to its good spatial resolution properties arising from columnar structure and terbium-doped gadolinium oxysulphide (Gd 2 O 2 S:Tb) due to its high X-ray absorption and light conversion efficiency [1][2][3][4]. Furthermore many scintillators have been investigated for X-ray imaging applications, such as Gd 2 O 2 S:Eu, Gd 2 O 2 S:Pr,Ce,F, Lu 2 O 3 :Eu, Gd 2 O 2 S:Pr employed in granular phosphors screens, and LuPO 4 :Eu semitransparent thin films [5][6][7][8][9]. Apart from the intrinsic properties of the scintillating materials, the structural properties such as grain size and shape seem to influence image quality in order of light diffusion [10].…”

Section: Introductionmentioning

confidence: 99%

X-ray imaging resolution of phosphor screens prepared with different grains size and shape of granular Lu₂O₃:Eu

Seferis

Michail

Zeler

et al. 2017

J. Phys.: Conf. Ser.

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Evaluation of Gd2O2S:Pr granular phosphor properties for X-ray mammography imaging

Cited by 24 publications

References 14 publications

Physical and optical studies of Gd₂O₂S:Eu³⁺ nanophosphors by microwave irradiation and γ‐irradiation methods

Physical and optical studies of Gd₂O₂S:Eu³⁺ nanophosphors by microwave irradiation and γ‐irradiation methods

Optical properties and radiation hardness of Pr-doped sol-gel silica: Influence of fiber drawing process

X-ray imaging resolution of phosphor screens prepared with different grains size and shape of granular Lu₂O₃:Eu

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Evaluation of Gd2O2S:Pr granular phosphor properties for X-ray mammography imaging

Cited by 24 publications

References 14 publications

Physical and optical studies of Gd2O2S:Eu3+ nanophosphors by microwave irradiation and γ‐irradiation methods

Physical and optical studies of Gd2O2S:Eu3+ nanophosphors by microwave irradiation and γ‐irradiation methods

Optical properties and radiation hardness of Pr-doped sol-gel silica: Influence of fiber drawing process

X-ray imaging resolution of phosphor screens prepared with different grains size and shape of granular Lu2O3:Eu

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Physical and optical studies of Gd₂O₂S:Eu³⁺ nanophosphors by microwave irradiation and γ‐irradiation methods

Physical and optical studies of Gd₂O₂S:Eu³⁺ nanophosphors by microwave irradiation and γ‐irradiation methods

X-ray imaging resolution of phosphor screens prepared with different grains size and shape of granular Lu₂O₃:Eu