Limsuwan, Pichet

Preferred name

Limsuwan, Pichet

Alternative Name

Limsuwan, P.

Main Affiliation

School of Science

pichet.li@kmitl.ac.th

Now showing 1 - 10 of 16

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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.
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Wantana, N.
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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 Sm3+ 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 Gd3+ ions exhibiting single exponential nature.
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Enhancement of gamma and X-ray shielding behaviors in ZnO-B2O3 glasses via La2O3 addition: Experimental and theoretical investigations
(2025-12-01)
Yabsantia, S.
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Wantana, N.
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Chusin, T.
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Kaewjaeng, S.
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Ornketphon, O.
Radiation shielding materials are crucial for reducing radiation exposure. Traditional materials such as lead, and concrete pose challenges related to toxicity and lack of transparency. This study aimed to assess the effects of lanthanum oxide (La<inf>2</inf>O<inf>3</inf>) addition on physical, optical, and radiation shielding properties of ZnO–B<inf>2</inf>O<inf>3</inf> glass systems. Glass samples of (80-x)B<inf>2</inf>O<inf>3</inf>–20ZnO-xLa<inf>2</inf>O<inf>3</inf> (x = 5–20 mol%) were prepared using the melt-quenching technique and characterized for density, molar volume, refractive index, transmittance and X-ray diffraction (XRD). Gamma-ray shielding performance was evaluated using the Compton scattering method with a Cs-137 source and NaI(Tl) detector, alongside theoretical data from WinXCOM. X-ray shielding capabilities were determined through experimental transmission measurements and Monte Carlo simulations (PHITS) across effective energies ranging from 30.40 to 44.21 keV. Increasing La<inf>2</inf>O<inf>3</inf> content (5–20 mol%) resulted in higher density (2.89–3.63 g/cm3), slightly increased molar volume (29.37–33.98 cm3/mol), and higher refractive index (1.58–1.65). All La<inf>2</inf>O<inf>3</inf>-added glasses exhibited ∼75 % transmittance in the visible region. XRD analysis indicated amorphous characteristics for all samples. For gamma rays, both experimental and theoretical results agreed well, showing improved shielding with higher La<inf>2</inf>O<inf>3</inf> levels. For lowest gamma-ray energy, the 20 mol% sample had the highest mass attenuation coefficient (μ<inf>m</inf>) of 0.21 cm2/g, lowest half value layer (HVL) of 0.89 cm, and shortest mean free path (MFP) of 1.29 cm. For X-rays, PHITS simulations and experiments also aligned, with μ<inf>m</inf> up to 4.21 cm2/g (at 30.40 keV), HVL of 0.05 cm, and MFP of 0.07 cm. These findings suggest that La<inf>2</inf>O<inf>3</inf> addition enhances both gamma and X-ray shielding effectiveness. In conclusion, the study highlights the potential of La<inf>2</inf>O<inf>3</inf>-added ZnO–B<inf>2</inf>O<inf>3</inf> glass as an alternative shielding material, with future research aimed at further improving its shielding performance.
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Ca co-doped CsI(Tl) crystal scintillator for γ- and X-ray detecting applications
(2025-01-01)
Tariwong, Y.
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Kim, H. J.
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Quang, Nguyen Duy
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Khan, Arshad
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Daniel, D. Joseph
The vertical Bridgman method is used for the growth of single-doped CsI(Tl) and CsI(Tl:Ca) crystals, which has been evaluated for feasible applications in X-ray imaging and radiation detection. The powder XRD technique study reveals a single-crystalline phase of the grown crystal. The emission spectra show a broad emission band with a maximum of 540 nm under X-ray excitation, along with the characteristic emissions that arose from the Tl+ intra-center transition. The scintillation qualities of the grown crystal were studied via the pulse height spectra, scintillation light yield, energy resolution, and scintillation decay time. Pulse shape discrimination (PSD) was investigated under γ-rays and α-particles excitation sources. Moreover, the X-ray imaging application was investigated by an X-ray synchrotron at the Synchrotron Light Research Institute to study the performance of the grown crystal. These preliminary investigations suggest that the grown CsI(Tl:Ca) crystal can be one of the promising crystals for γ- and X-ray detecting applications.
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Effect of Gd2O3 on the radiation shielding, physical, optical and luminescence behaviors of Gd2O3–La2O3–ZnO–B2O3–Dy2O3 glasses
(2021-08-01)
Kaewjaeng, S.
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Wantana, N.
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Kothan, S.
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Rajaramakrishna, R.
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Kim, H. J.
The present work focuses on lead-free glasses, their shielding behavior, and other optical studies. The glass composition with 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>+1Dy<inf>2</inf>O<inf>3</inf>, x = 0, 5, 10, 15, 20 mol% were prepared to the characterization on physical, absorption spectra, photo-, radioluminescence, and radiation shielding properties. In the experimental results, the density of Gd-1Dy glass samples increases with the increase of Gd3+ ions concentrations. The ten-strong peak in the 5Gd-1Dy glass of absorption spectra in UV–Vis–NIR regions. The white photoluminescence spectra base of Gd-1Dy glass samples can be generated under excitation at 351 nm makes the strongest emission of Dy3+ ions and excitation through energy transfer from Gd3+ in Gd-1Dy glass samples with 275 and 351 nm. This strong white emission of Dy3+ ions also strong in x-ray luminescence and performs the integral scintillation efficiency of 33% when compared with BGO crystal. The radiation shielding properties in the diagnostic medicine energies region are correlated, the values of glass samples better than commercial windows, bricks, and concrete. The HVL values of glass sample at 15 and 20 mol% of Gd<inf>2</inf>O<inf>3</inf> has been found better than X-ray windows. The corollaries of Gd-1Dy glass samples can be a candidate for radiation detector and lead-free radiation shielding materials in future.
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Eu-Doped Gd2MoB2O9 Phosphors for Latent Fingerprints Detection
(2022-01-01)
Chamchoi, N.
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Sangwaranatee, N.
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Rajaramakrishna, R.
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Kim, H. J.
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Chaemlek, O.
The luminescent powders from rare-earth ions doped oxides have been successfully used for latent fingerprint detection due to high efficiency, high contrast and low background interface. The Gd<inf>2</inf>MoB<inf>2</inf>O<inf>9</inf>:Eu3+ phosphors with varying compositions of Eu3+ions were synthesized by solid state reaction method. These phosphors were investigated by X-ray diffraction (XRD), diffuse reflectance spectroscopy, photoluminescence (PL), and decay curves studies. Multiphoton relaxation decay rate and coupling strength was evaluated using phonon side band spectrum showing 0.4 mol% doped samples show less non radiative decay rate. The 0.40 mol% of Eu3+ ion concentration doped in the Gd<inf>2</inf>MoB<inf>2</inf>O<inf>9</inf> host lattice show highest photoluminescence emission intensity at 613 nm, in orange red region, monitored at 394 nm excitation. The Gd<inf>2</inf>MoB<inf>2</inf>O<inf>9</inf>:Eu3+ phosphors samples were optimized to 900 °C sintering temperature and optimum milling time at 3 min in the present work. The latent fingerprints detection that developed from Gd<inf>2</inf>MoB<inf>2</inf>O<inf>9</inf>:Eu3+ phosphors in this work exhibited clearly ridge characteristics under UV illumination. The results revealed thatGd<inf>2</inf>MoB<inf>2</inf>O<inf>9</inf>:Eu3+ phosphors are potential practical forensic science applications.
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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.
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Kantuptim, P.
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Nishikawa, A.
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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 Ce3 + -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/cm3) 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 Gd3+ (310 nm) and Ce3+ (∼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 241Am 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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Development of BaO-containing radiation-shielding glass using natural dolomite as a raw-material component
(2027-01-01)
Cheewasukhanont, W.
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Kothan, S.
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Tungjai, M.
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Intachai, N.
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Ruangtaweep, Y.
This study investigates the incorporation of dolomite (CaMg(CO<inf>3</inf>)<inf>2</inf>) as a natural substitute for synthetic CaO in the fabrication of radiation shielding glass (RSG). Dolomite samples from Kanchanaburi, Thailand, were characterized using X-ray fluorescence (XRF) to determine their chemical composition, revealing CaO (76.59-79.84 wt%) and MgO (19.13-21.54 wt%) as the primary components. These dolomites were used to synthesize borosilicate-based host glasses, where density remained stable (∼2.5 g/cm3), ensuring structural integrity. Optical transmittance measurements showed an average 80% transparency in the visible range. To enhance radiation attenuation, BaO was incorporated into the glass matrix at varying concentrations (5-35 mol%). Increasing BaO content increased the density of the glass samples, which contributed to improved radiation attenuation performance. The radiation-shielding properties, predicted using WinXCom over a wide photon energy range and experimentally evaluated at 0.662 MeV, improved with increasing BaO content. The HVL, Pb-equivalent thickness, and EABF results further supported the enhanced attenuation performance of the developed glasses, indicating that higher BaO content reduced the contribution of scattered photons to absorbed energy buildup in the intermediate-energy region. In addition, preliminary glass-forming tests of the B4 composition demonstrated the feasibility of preparing a larger glass sheet under similar melting and annealing conditions, although further optimization is still required. These findings suggest that natural dolomite can serve as a useful raw-material component for developing BaO-containing radiation-shielding glass with balanced optical transparency, density, and attenuation performance.
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White Emission from Li2O-BaO-Bi2O3-P2O5 Glass Doped with Dy3+ for Optical Condensed Material Applications
(2021-01-01)
Tongdang, J.
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Chanthima, N.
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Kiwsakunkarn, N.
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Tariwong, Y.
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Rajaramakrishna, R.
Dy3+-doped lithium barium bismuth phosphate glasses were synthesized by the melt-quenching. The structural characteristics of the synthesized glasses were investigated by Fourier transform infrared (FTIR) spectroscopy. Symmetric and asymmetric vibrations of phosphorous oxygen groups were prominent bands in the FTIR spectra. Judd–Ofelt theory have been evaluated by the intensities of absorption bands in order to calculate oscillator strength (f). Luminescence intensity increases with increase in BaO content due to substitution of Ba2+ replacing Bi3+ which lead more void spaces providing enough space for Dy3+ ions to fit in. The branching ratio β parameter was distinguished to be maximum for the emission transition of 4F<inf>9/2</inf> → 6H<inf>13/2</inf> with the values of 0.59. LBBPDy glasses reveal an ideal warm white region when observed in CIE diagram. Our investigation reveals that the synthesized glasses may be utilized as a solid-state lighting material in various technological and industrial applications.
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Luminescence and physical properties of Ce3+-doped potassium gadolinium phosphate glasses for radiation detector application
(2021-08-01)
Yodkantee, D.
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Prasatkhetragarn, A.
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Chanthima, N.
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Tariwong, Y.
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Kothan, S.
This work aimed to study the effect of Gd<inf>2</inf>O<inf>3</inf> and CeF<inf>3</inf> modified on potassium gadolinium phosphate glasses scintillators in 17K<inf>2</inf>O: xGd<inf>2</inf>O<inf>3</inf>: (82.5-x)P<inf>2</inf>O<inf>5</inf>: 0.5CeF<inf>3</inf> (where x = 9, 11, 13, 15 and 17 mol%) and 17K<inf>2</inf>O: 17Gd<inf>2</inf>O<inf>3</inf>: (66-x)P<inf>2</inf>O<inf>5</inf>: xCeF<inf>3</inf> (where x = 0.1, 0.3, 1, 1.5, 2, 3 and 5 mol%) systems produced by the melt quenching technique. The physical, optical, and scintillation properties of the specimens were measured and discussed. The density and molar volume of the glasses trend to increases with increasing Gd<inf>2</inf>O<inf>3</inf> concentration, while an invariable for all CeF<inf>3</inf> concentration. The photoluminescence and x-ray luminescence spectrums show the highest value at 9 and 17 mol% of Gd<inf>2</inf>O<inf>3</inf> concentration, respectively, which shows the decay time between 15.02 and 22.84 ns. XANES results shows the main oxidation state of Ce is 3+ ion for all glasses. However, the photoluminescence and x-ray luminescence spectrums show the maximum value at 5 mol% of CeF<inf>3</inf> concentration, which shows the fast decay time between 16.26 and 36.02 ns. These results of the x-ray induced luminescence and the fast decay time in nanoseconds level are possible applied as well as the scintillation materials for radiation detector application.
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White Emission from Dy3+ Doped in ZnO–CaO–B2O3 for WLEDs Material Application
(2022-01-01)
Chaemlek, O.
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Kiwsakunkran, N.
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Boonpa, W.
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Wantana, N.
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Sareein, T.
The Dy3+ ions doped CaO-ZnO-B<inf>2</inf>O<inf>3</inf> glasses were synthesis by the melt quenching technique with various Dy<inf>2</inf>O<inf>3</inf> concentrations to investigation physical and optical properties. The results showed that the density and the molar volume trend to be increased along with increased Dy3+ concentration. The absorption spectra showed characteristic absorption peaks in the visible and near infrared regions. Judd–Ofelt (JO) intensity parameters have been obtained from the optical absorption spectra. The emission spectra of the glasses are illustrated the highest emission intensity at 574 nm wavelength, which corresponding to Dy3+ transition 4F<inf>9/2</inf>→6H<inf>13/2</inf> level. The decay time value decreased as the concentration of Dy<inf>2</inf>O<inf>3</inf> increased. The CIE 1931 chromaticity investigation showed that Dy3+ doped glasses emitted light with white color.

Limsuwan, Pichet

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