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Author: search.filters.author.Kaewnuam, E.

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    Enhanced luminescence and scintillation performance of Ce-doped silico- and germanophosphate glasses for ultra-high resolution synchrotron X-ray imaging applications
    (2026-06-15)
    Sarumaha, C. S.
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    Kaewnuam, E.
    ;
    Kantuptim, P.
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    Nishikawa, A.
    ;
    Kato, T.
    Ce-doped phosphate, silicophosphate and germanophosphate glasses with the composition 25Li<inf>2</inf>O+ 10ZnO+ 5Gd<inf>2</inf>O<inf>3</inf>+xR+ (59.5-x)P<inf>2</inf>O<inf>5</inf>+ 0.5CeF<inf>3</inf> (x = 0, 10 mol%; R = SiO<inf>2</inf> and GeO<inf>2</inf>) were prepared by the conventional melt quenching. This study highlights the novel role of network modification (SiO<inf>2</inf> and GeO<inf>2</inf> substitution) in enhancing the scintillation and imaging performance of Ce<sup>3 +</sup> -activated phosphate-based glasses; this topic remains inadequately researched. Structural analyses (FTIR, Raman) demonstrated that network modifications influence density and optical properties, with germanophosphate showing the highest density (3.07 g/cm<sup>3</sup>) and high transparency of around 80%. Notably, silicophosphate glass exhibits ∼12 times higher photoluminescence intensity than phosphate glass, with an experimental quantum yield of 24.8%. Under X-ray excitation, strong emission bands were observed from Gd<sup>3+</sup> (310 nm) and Ce<sup>3+</sup> (∼337 nm). The integrated ratio of radioluminescence (RL) emission was calculated and followed the order silicophosphate > phosphate > germanophosphate, indicating optimal luminescence enhancement via Si incorporation. The superior scintillation response of the silicophosphate glass is further validated by pulse height measurements under <sup>241</sup>Am α-ray excitation. Silicophosphate glass was selected for its superior scintillation response, further confirmed by 2D/3D imaging and line-pair (MTF and contrast) analyses, demonstrating its suitability for ultra-high-resolution synchrotron X-ray imaging applications.
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    Novel Tb3+ doped borophosphate glass scintillator for X-ray imaging
    (2024-10-01)
    Khrongchaiyaphum, F.
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    Wantana, N.
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    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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    Na2O-Gd2O3-Al2O3-P2O5 glass scintillator doped with Dy3+: X-rays and proton responses
    (2023-01-01)
    Wantana, N.
    ;
    Kaewnuam, E.
    ;
    Tariwong, Y.
    ;
    Quang, Nguyen Duy
    ;
    Pakawanit, P.
    Dy<sup>3+</sup>:Na<inf>2</inf>O-Al<inf>2</inf>O<inf>3</inf>-Gd<inf>2</inf>O<inf>3</inf>-P<inf>2</inf>O<inf>5</inf> (Dy:NAGP) glasses were fabricated to investigate the capability for radiation responses. The influence of Dy<inf>2</inf>O<inf>3</inf> concentration on glass properties was studied. The density and effective atomic number of glass increased with the addition of Dy<inf>2</inf>O<inf>3</inf> content. The glasses absorbed the photons in the ultraviolet, visible light, and near-infrared region. In photoluminescence (PL) spectra, the obvious yellow emission at 574 nm and blue emission at 482 nm of Dy<sup>3+</sup> were both generated by the direct excitation and the Gd-Dy energy transfer. The PL decay time of glasses was in the millisecond order. There was thermal quenching observed in temperature-dependent luminescence (TDL). The radioluminescence (RL) and protonluminescence (PrL) represented the emission pattern of Dy<sup>3+</sup> similarly to PL spectra. The concentration quenching caused 0.50Dy:NAGP glass with the highest PL and RL emission intensity. The X-ray imaging of developed glass using a synchrotron light source was successfully imaged for the first time.