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Author: search.filters.author.Kothan, S.Subject: search.filters.subject.Luminescence

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    A novel material for radiation detection application of zinc bismuth lithium borotellurite glass doped with Dy2O3
    (2024-12-01)
    Sommat, V.
    ;
    Ornketphon, O.
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    Kaewjaeng, S.
    ;
    Kothan, S.
    ;
    Limsuwan, P.
    Radiation detection glass with the following chemical composition B<inf>2</inf>O<inf>3</inf>–TeO<inf>2</inf>–Li<inf>2</inf>O<inf>3</inf>–Bi<inf>2</inf>O<inf>3</inf>–ZnO doped with Dy<inf>2</inf>O<inf>3</inf> where x = 0.00, 0.10, 0.50, 1.00, 1.50 and 2.00 mol%, was developed for the characterization of physical properties such as density, molar volume (V<inf>m</inf>), and refractive index, optical absorption, luminescence, CIE's diagram, and radiation detection properties. The density and refractive index of glass samples increase with the increase of Dy<inf>2</inf>O<inf>3</inf> composition. The optical property of glass shows eight strongest peaks from <sup>6</sup>H<inf>15/2</inf> centering at 263 nm (<sup>4</sup>I<inf>13/2</inf> + <sup>4</sup>F<inf>7/2</inf>), 298 nm (<sup>4</sup>G<inf>11/2</inf>), 357 nm (<sup>4</sup>I<inf>15/2</inf>), 803 nm (<sup>6</sup>F<inf>5/2</inf>), 897 nm (<sup>6</sup>F<inf>7/2</inf>), 1090 nm (<sup>6</sup>H<inf>7/2</inf> + <sup>6</sup>F<inf>9/2</inf>), 1272 nm (<sup>6</sup>F<inf>11/2</inf> + <sup>6</sup>H<inf>9/2</inf>) and 1671 nm (<sup>6</sup>H<inf>11/2</inf>), respectively. The emission peaks are r (<sup>4</sup>F<inf>9/2</inf>), 481 nm (<sup>6</sup>H<inf>15/2</inf>), 575 nm (<sup>6</sup>H<inf>13/2</inf>), 664 nm (<sup>6</sup>H<inf>11/2</inf>), and 751 nm (<sup>6</sup>H<inf>9/2</inf>) under excited at 453 nm (<sup>4</sup>F<inf>9/2</inf>), respectively. The excitation peaks under emission at 575 nm from <sup>6</sup>H<inf>15/2</inf> centering at 350 nm (<sup>6</sup>P<inf>7/2</inf>), 365 nm (<sup>4</sup>P<inf>3/2</inf>), 388 nm (<sup>4</sup>K<inf>17/2</inf>), 425 nm (<sup>4</sup>G<inf>11/2</inf>), 453 nm (<sup>4</sup>I<inf>15/2</inf>), and 471 nm (<sup>4</sup>F<inf>9/2</inf>) respectively. The study of luminescence characteristics, which includes emission, excitation, and CIE diagrams, reveals white emission bands that coincide with the CIE diagram. Furthermore, measuring the parameters of the thermoluminescence dosimeter (TLD) recorded with a heating rate of 5 °C/s in the temperature up to a maximum of 400 °C yields good results in low dose radiation detection. Based on all the results, it was determined that this glass can be a candidate for radiation detection materials in the future.
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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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    Eu2O3 doped silicoborate glasses for scintillation material application: Luminescence ability and X-ray imaging
    (2023-12-01)
    Intachai, N.
    ;
    Kothan, S.
    ;
    Wantana, N.
    ;
    Kaewjaeng, S.
    ;
    Pakawanit, P.
    The glass samples were prepared by melt quenching method and changing Eu<inf>2</inf>O<inf>3</inf> concentrations following component of xEu<inf>2</inf>O<inf>3</inf> - 40Na<inf>2</inf>O - 7.5Gd<inf>2</inf>O<inf>3</inf> - 5SiO<inf>2</inf> - (47.5-x)B<inf>2</inf>O<inf>3</inf> (x = 0, 1, 2, 3 mol %). Density and molar volume tend to increase with increasing Eu<inf>2</inf>O<inf>3</inf> concentrations, corresponding to the larger non-bridging oxygen. Fourier transform infrared spectra (FTIR) results point out that the majority BO<inf>3</inf> borate group. The absorption spectra were represented in the length of UV-Vis and NIR region. The phonon energy of 3Eu:7.5Gd was 1280.54 cm<sup>−1</sup>, related to the borate glass host. The photoluminescence and X-ray-induced luminescence spectra of 3Eu:7.5Gd glass showed similar highest intensity at 613 nm (<sup>5</sup>D<inf>0</inf>→<sup>7</sup>F<inf>2</inf>). The photoluminescence quantum yield (PLQY) of 3Eu:7.5Gd glass shows the highest value at 85.70 %. The scintillation efficiency of 3Eu:7.5Gd glass was 17.51 % of bismuth germanate (BGO) crystal. The decay time owing to Eu<sup>3+</sup> emission is 2.054 ms for 2Eu:7.5Gd glass. The highest energy transfer efficiency was 2 mol % of Eu<inf>2</inf>O<inf>3</inf> concentrations (η<inf>ET</inf> = 70 %). The CIE chromaticity coordinates of the glasses are placed in the reddish-orange area (0.65, 0.35). The spatial resolution of X-ray imaging study was 10 lp/mm. These results suggest that 3 mol % of Eu<inf>2</inf>O<inf>3</inf> doped silicoborate glass is capable of being a scintillator applied in the X-ray imaging system.
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    Fabrication luminescence and radiation shielding properties of Gd2O3–La2O3–ZnO–B2O3–Sm2O3 glasses
    (2023-01-01)
    Kaewjaeng, S.
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    Kothan, S.
    ;
    Wantana, N.
    ;
    Kim, H. J.
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    Rajaramakrishna, R.
    The purpose of developing high transparency radiation shielding materials and luminescence materials with stoichiometric ratio of xGd<inf>2</inf>O<inf>3</inf>:10La<inf>2</inf>O<inf>3</inf>:10ZnO:(79-x) B<inf>2</inf>O<inf>3</inf>: 1Sm<inf>2</inf>O<inf>3</inf> where x = 0, 5, 10, 15, and 20 mol% using melt quenching technique. The physio-optical properties such as molar volume, density, concentration of rare-earth ions, polaron radius, inter-ionic radius, optical basicity, average distance between rare-earth ions, and optical packing density of the present glasses has been evaluated. The glass samples obtained show high density which is vital factor for radiation shielding. The absorption spectra show significant of bands Sm<sup>3+</sup> ions. The FTIR results of Gd-La-Zn-B-Sm (Gd-1Sm) glass samples show signature borate BO<inf>3</inf> and BO<inf>4</inf> vibrational units in Gd-1Sm glass samples. The μ, μ<inf>m</inf>, HVL, TVL, and MFP were evaluated and showed that the values decrease with increasing X-ray energy whereas increase with an increase in Gd<inf>2</inf>O<inf>3</inf> content suggesting their potential use in X-ray diagnosis regions. The HVL value was compared with commercial windows, concrete, Serpentine and X-ray windows and found that the glasses doped with 10 mol%, 15mol%, and 20 mol% Gd<inf>2</inf>O<inf>3</inf> content showed better results than X-Ray windows at 10 kVp. The emission and excitation spectra of glass samples were studied and emission spectra show orange emission bands. The experimental lifetime analysis shows that the glass samples show decreasing trend from 1.161 to 1.128 ms with an increase in Gd<sup>3+</sup> ions exhibiting single exponential nature.