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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.
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Pakawanit, P.
;
Phoovasawat, C.
In this study, we introduce an efficient green-emitting material made from Tb3+ 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 Tb3+ 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 5D<inf>4</inf> → 7F<inf>5</inf> transition of Tb3+. The energy transfer from Gd3+ to Tb3+ 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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Eu3+ Doped Na2O-Gd2O3-BaO-B2O3-P2O5 glasses for x-ray scintillator application
(2023-11-01)
Khrongchaiyaphum, F.
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Wantana, N.
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Kansirin, S.
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Pakawanit, P.
;
Vittayakorn, N.
The Na<inf>2</inf>O-BaO-B<inf>2</inf>O<inf>3</inf>-P<inf>2</inf>O<inf>5</inf> doped with varying concentrations of Gd<inf>2</inf>O<inf>3</inf> and Na<inf>2</inf>O-Gd<inf>2</inf>O<inf>3</inf>-BaO-B<inf>2</inf>O<inf>3</inf>-P<inf>2</inf>O<inf>5</inf> glasses were doped with varying concentrations of Eu<inf>2</inf>O<inf>3</inf> (referred to as Eu:NGBaPB) and prepared using the melt-quenching technique. These glasses were analyzed comprehensively in the physical, optical, chemical groups and photo-/radio- luminescence properties. Furthermore, the X-ray imaging was operated to indicate the practical radiation detection of glass. The addition of Eu<inf>2</inf>O<inf>3</inf>, the density and refractive index of Eu:NGBaPB glasses increased, while the molar volume decreased. The glass exhibited photon absorption in the UV-NIR regions. Excitation from various sources such as X-ray, ultraviolet, and visible light resulted in a reddish-orange emission at approximately 613 nm, originating from the 5D<inf>0</inf>→7F<inf>2</inf> radiation state of Eu3+. Energy transfer occurred from Gd3+ to Eu3+ within the glass. These findings highlight the intriguing potential of the glass for applications as an X-ray scintillator.
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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.
;
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 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.
;
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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