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Author: search.filters.author.Intachai, N.Subject: search.filters.subject.Borophosphate glass

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    Item type:Publication,
    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.