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Author: search.filters.author.Limsuwan, P.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.
    ;
    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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    Fabrication luminescence and radiation shielding properties of Gd2O3–La2O3–ZnO–B2O3–Sm2O3 glasses
    (2023-01-01)
    Kaewjaeng, S.
    ;
    Kothan, S.
    ;
    Wantana, N.
    ;
    Kim, H. J.
    ;
    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.
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    Radio and photo luminescence properties of Dy3+ ion doped bismuth barium gadolinium borate glass
    (2023-01-01)
    Ruamnikhom, R.
    ;
    Yasaka, P.
    ;
    Boonin, K.
    ;
    Limsuwan, P.
    ;
    Kaewkhao, J.
    Investigations on physical, optical and photo – radio luminescence properties of dysprosium doped bismuth barium gadolinium borate glass (BiBaGdBDy) have been prepared for the melt at 1200 °C and rapidly cooling in the casting process. The glasses were doped by Dy<inf>2</inf>O<inf>3</inf> with six concentrations which varied from 0.00 to 1.50 mol%. The cut and polished glass samples were measured density and refractive index at room temperature. The absorption spectra show at the wavelength 802, 891, 1083, 1265 and 1679 nm that that are matched with the transition of Dy<sup>3+</sup> from <sup>6</sup>H<inf>15/2</inf> (ground state) to various excited state <sup>6</sup>F<inf>5/2</inf>, <sup>6</sup>F<inf>7/2</inf>, <sup>6</sup>F<inf>9/2</inf>, <sup>6</sup>F<inf>11/2</inf> and <sup>6</sup>H<inf>11/2</inf> respectively. The 387 nm flash lamp was used to excite the sample lead to display the five emission bands at 481, 576, 661 and 753 nm which matched with the emission transitions <sup>4</sup>F<inf>9/2</inf>→<sup>6</sup>H<inf>J</inf> (J = 15/2, 13/2, 11/2 and 9/2) respectively. The prominent blue light from <sup>4</sup>F<inf>9/2</inf>→<sup>6</sup>H<inf>15/2</inf> and yellow light from <sup>4</sup>F<inf>9/2</inf>→<sup>6</sup>H<inf>13/2</inf> emissions was combined and produces white light emission, which is confirmed by the CIE chromaticity diagram. The certain Lifetime of important laser-level is <sup>4</sup>F<inf>3/2</inf>, which shows a decreasing trend with the increase of Dy<inf>2</inf>O<inf>3</inf> concentration. The Judd-Ofelt (J-O) intensity parameters found the trend Ω<inf>2</inf> > Ω<inf>4</inf> > Ω<inf>6</inf>. The branching ratios (β<inf>R</inf>) transition probabilities (A<inf>R</inf>) and stimulated emission cross-sections (σ<inf>e</inf>) were estimated for <sup>4</sup>F<inf>9/2</inf>→<sup>6</sup>H<inf>13/2</inf> transition they are the radiative properties that were used to figure out the potential benefit of these glasses for laser action in the visible region along these lines suggests that the present Dy<sup>3+</sup> doped bismuth barium gadolinium borate glasses are suitable for white light applications and scintillator material.