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Author: search.filters.author.Kothan, S.Subject: search.filters.subject.Borophosphate glass

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    Novel Tb3+ doped borophosphate glass scintillator for X-ray imaging
    (2024-10-01)
    Khrongchaiyaphum, F.
    ;
    Wantana, N.
    ;
    Kaewnuam, E.
    ;
    Pakawanit, P.
    ;
    Phoovasawat, C.
    In this study, we introduce an efficient green-emitting material made from Tb<sup>3+</sup> doped borophosphate scintillating glass for X-ray imaging. An influence of Tb<inf>2</inf>O<inf>3</inf> concentration on the physical, optical, luminescent, and scintillation properties of glasses were investigated. The glass density and refractive index increase, while the molar volume and Tb<sup>3+</sup> inter-ionic distance decreases with Tb<inf>2</inf>O<inf>3</inf> addition. These glasses absorb the photons in range of UV, Vis, and NIR. The excitations by UV and X-ray on glasses causes the strong green emission centered around 545 nm by the <sup>5</sup>D<inf>4</inf> → <sup>7</sup>F<inf>5</inf> transition of Tb<sup>3+</sup>. The energy transfer from Gd<sup>3+</sup> to Tb<sup>3+</sup> was occurred in this emission. The glass doped with 4 mol% of Tb<inf>2</inf>O<inf>3</inf> demonstrates the highest emission intensity at 545 nm due to the concentration quenching. The decay time of glasses are in few milliseconds. The integral X-ray scintillation efficiency of 4 mol% doped glass is 52% compared to that of BGO crystal. Additionally, this glass was proceeded in the X-ray imaging and yielded the image with satisfied resolution, characteristics and MTF values, compared to that obtained from YAG:Ce crystal. The developed glass has a potential for X-ray imaging applications, especially in the medical imaging, flaw detection, and security inspection.
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    Eu3+ Doped Na2O-Gd2O3-BaO-B2O3-P2O5 glasses for x-ray scintillator application
    (2023-11-01)
    Khrongchaiyaphum, F.
    ;
    Wantana, N.
    ;
    Kansirin, S.
    ;
    Pakawanit, P.
    ;
    Vittayakorn, N.
    The Na<inf>2</inf>O-BaO-B<inf>2</inf>O<inf>3</inf>-P<inf>2</inf>O<inf>5</inf> doped with varying concentrations of Gd<inf>2</inf>O<inf>3</inf> and Na<inf>2</inf>O-Gd<inf>2</inf>O<inf>3</inf>-BaO-B<inf>2</inf>O<inf>3</inf>-P<inf>2</inf>O<inf>5</inf> glasses were doped with varying concentrations of Eu<inf>2</inf>O<inf>3</inf> (referred to as Eu:NGBaPB) and prepared using the melt-quenching technique. These glasses were analyzed comprehensively in the physical, optical, chemical groups and photo-/radio- luminescence properties. Furthermore, the X-ray imaging was operated to indicate the practical radiation detection of glass. The addition of Eu<inf>2</inf>O<inf>3</inf>, the density and refractive index of Eu:NGBaPB glasses increased, while the molar volume decreased. The glass exhibited photon absorption in the UV-NIR regions. Excitation from various sources such as X-ray, ultraviolet, and visible light resulted in a reddish-orange emission at approximately 613 nm, originating from the <sup>5</sup>D<inf>0</inf>→<sup>7</sup>F<inf>2</inf> radiation state of Eu<sup>3+</sup>. Energy transfer occurred from Gd<sup>3+</sup> to Eu<sup>3+</sup> within the glass. These findings highlight the intriguing potential of the glass for applications as an X-ray scintillator.