Energy transfer based emission analysis of Eu³⁺ doped Gd₂O₃-CaO-SiO₂-B₂O₃ glasses for laser and X-rays detection material applications

Wantana, N.,Kaewnuam, E.,Damdee, B.,Kaewjaeng, S.,Kothan, S.,Kim, H.J.,Kaewkhao, J. Elsevier 2018 Journal of luminescence Vol.194 No.-

<P><B>Abstract</B></P> <P>The Eu<SUP>3+</SUP>-doped CaO-Gd<SUB>2</SUB>O<SUB>3</SUB>-SiO<SUB>2</SUB>-B<SUB>2</SUB>O<SUB>3</SUB> glasses were prepared to study photoluminescence, lasing potential and scintillation properties. Glasses absorb photons in ultraviolet, visible light and near infrared regions and are assigned to the energy transitions of Gd<SUP>3+</SUP> and Eu<SUP>3+</SUP>. Ultraviolet with 275nm can generate the strong red emission with 614nm via energy transfer form Gd<SUP>3+</SUP> to Eu<SUP>3+</SUP>. X-ray scintillation study exhibits strong emission pattern due to Gd-Eu energy transfer. The optimum concentrations of Eu<SUP>3+</SUP> ion in this glass is 0.30mol% as it results maximum emission intensity. The fluorescence lifetime of the <SUP>5</SUP>D<SUB>0</SUB> level decreases from 1.763 to 1.726ms when concentration increased from 0.05 to 0.40mol%. From Judd-Ofelt analysis, this glass exhibit high potential for using as laser medium for red laser device with high lasing power and energy extraction ratio. Moreover, this glass performs the integral scintillation efficiency as 13% compared with BGO.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Investigations of optical and luminescence features of Sm³⁺ doped Li₂O-MO-B₂O₃ (M =Mg/Ca/Sr/Ba) glasses mixed with different modifier oxides as an orange light emitting phosphor for WLED's

Kirdsiri, K.,Raja Ramakrishna, R.,Damdee, B.,Kim, H.J.,Kaewjaeng, S.,Kothan, S.,Kaewkhao, J. Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.749 No.-

<P><B>Abstract</B></P> <P>The glass composition of 50Li<SUB>2</SUB>O-20MO-29.7B<SUB>2</SUB>O<SUB>3</SUB>-0.3Sm<SUB>2</SUB>O<SUB>3</SUB> (M = Mg/Ca/Sr/Ba), has been synthesized by the conventional melt quench technique. Density measurements were studied and shows large for LBaBSm glass sample (2.9049 g/cm<SUP>3</SUP>) than any other alkali species (Mg/Ca/Sr). Variation in density is due to the ionic radii of the alkali ion species (M = Mg/Ca/Sr/Ba). Optical absorption spectra of Sm<SUP>3+</SUP> doped LMgB, LCaB, LSrB and LBaB glass systems were studied and shows very intense peaks at NIR region. The emission and excitation spectra of these glasses were studied and emission spectra shows green, yellow and reddish - orange emission bands at 563, 600, 646 and 706 nm. Judd–Ofelt (JO) intensity analysis had been performed and JO parameters were estimated for 0.3 mol.% Sm<SUB>2</SUB>O<SUB>3</SUB> doped 50Li<SUB>2</SUB>O-20MO-29.7B<SUB>2</SUB>O<SUB>3</SUB> (M = Mg/Ca/Sr/Ba) glasses. Radiative properties such as transition probabilities, stimulated emission cross-sections and branching ratios were estimated by using JO parameters and luminescence spectra. The decay curves of these glasses exhibit single exponential nature. The CCT values obtained from CIE for these glass samples shows 1663 K for indicating orange emission under 403 nm excitation wavelength.</P> <P><B>Highlights</B></P> <P> <UL> <LI> J-O parameters of Li2O-MO-B2O3 (M = Mg/Ca/Sr/Ba) glass doped Sm<SUP>3+</SUP> studied. </LI> <LI> LBaBSm0.3 glass show more asymmetry around Sm<SUP>3+</SUP> ion than other transition ions. </LI> <LI> LBaBSm0.3 glass emit bright reddish-orange luminescence at 403 nm excitation. </LI> <LI> The CCT values obtained for glass samples around 1663 K in orange emission. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>UV–Vis–NIR spectra of LMOBSm0.3 (M = Mg, Ca, Sr, Ba) samples.</P> <P>[DISPLAY OMISSION]</P>

Optical properties in the visible luminescence of SiO2:B2O3:CaO:GdF3 glass scintillators containing CeF3

Park, J. M.,Kim, H. J.,Karki, Sujita,Kaewkhao, J.,Damdee, B.,Kothan, S.,Kaewjaeng, S. 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.

<P>CeF3-doped silicaborate-calcium-gadolinium glass scintillators, with the formula 10SiO(2):(55-x)B2O3:10CaO:25GdF(3):xCeF(3), were fabricated by the melt-quenching technique. The doping concentration of the CeF3 was from 0.00 mol% to 0.20 mol%. The optical properties of the CeF3 doped glass scintillators were studied by using various radiation sources. The transition state of the CeF3-doped glass scintillators studied by using the absorption and photo-luminescence spectrum results. The X-ray, photo, proton and laser-induced luminescence spectra were also studied to understand the luminescence mechanism under various conditions. To understand the temperature dependence, the laser-induced luminescence and the decay component of the CeF3-doped glass scintillator were studied while the temperature was varied from 300 K to 10 K. The emission wavelength spectrum showed from 350 nm to 55 nm under various radiation sources. Also the CeF3-doped glass scintillator have one decay component as 34 ns at room temperature.</P>

Optical Properties in the Visible Luminescence of SiO2:B2O3:CaO:GdF3 Glass Scintillators Containing CeF3

J. M. PARK,김홍주,Sujita Karki,J. Kaewkhao,B. Damdee,S. Kothandaraman,S. Kaewjaeng 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.11

CeF3-doped silicaborate-calcium-gadolinium glass scintillators, with the formula 10SiO2:(55- x)B2O3:10CaO:25GdF3:xCeF3, were fabricated by the melt-quenching technique. The doping concentration of the CeF3 was from 0.00 mol% to 0.20 mol%. The optical properties of the CeF3 doped glass scintillators were studied by using various radiation sources. The transition state of the CeF3- doped glass scintillators studied by using the absorption and photo-luminescence spectrum results. The X-ray, photo, proton and laser-induced luminescence spectra were also studied to understand the luminescence mechanism under various conditions. To understand the temperature dependence, the laser-induced luminescence and the decay component of the CeF3-doped glass scintillator were studied while the temperature was varied from 300 K to 10 K. The emission wavelength spectrum showed from 350 nm to 55 nm under various radiation sources. Also the CeF3-doped glass scintillator have one decay component as 34 ns at room temperature.

Photoluminescence and white light generation behavior of lithium gadolinium silicoborate glasses

Shamshad, L.,Rooh, G.,Kirdsiri, K.,Srisittipokakun, N.,Damdee, B.,Kim, H.J.,Kaewkhao, J. Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.695 No.-

<P><B>Abstract</B></P> <P>The Dy<SUP>3+</SUP>-doped lithium gadolinium silica borate glasses with composition (in mol%) 40Li<SUB>2</SUB>O:15Gd<SUB>2</SUB>O<SUB>3</SUB>:5SiO<SUB>2</SUB>: (40-x)B<SUB>2</SUB>O<SUB>3</SUB>:xDy<SUB>2</SUB>O<SUB>3</SUB>, x = 0.01, 0.1, 0.5, 1.0, 2.0 were prepared by melt quenching technique and characterized through absorption and emission spectra, CIE chromaticity coordinates and decay rate analysis. Judd-Oflet parameters have been calculated for lithium gadolinium silico borate glass and used for the derivation of radiative properties for excited luminescent levels of Dy<SUP>3+</SUP> ions. The feasibility of white light generation have been evaluated by the yellow-to-blue emission intensity ratios and CIE chromaticity coordinates as a function of Dy<SUP>3+</SUP> concentration. The non-exponential decay rates are well-fitted to Inokuti-Hirayama model for S = 6. The perceived non-exponential decay nature and life time quenching have been ascribed to the energy transfer between excited and unexcited Dy<SUP>3+</SUP> ions through dipole–dipole interaction. The CCT values for the present studied glasses obtained in the 4584-4235 K at λ<SUB>exc</SUB> = 387 nm. These CCT values are below the warm CCT (i.e CCT 4000 K). The reasonably good luminescence properties of LGSiBDy10 glass indicates the potentiality of the title of glass to be applied as lasing medium for white light generation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spectroscopic properties of Dy<SUP>3+</SUP> ion in Li<SUB>2</SUB>OGd<SUB>2</SUB>O<SUB>3</SUB> SiO<SUB>2</SUB> B<SUB>2</SUB>O<SUB>3</SUB> were studied. </LI> <LI> JO analysis were used to analyze spectroscopic properties. </LI> <LI> White emission was observed from glass sample. </LI> <LI> Lasing properties were characterized. </LI> </UL> </P>

Optical and luminescence characteristics of Eu 3+ -doped B 2 O 3 :SiO 2 :Y 2 O 3 :CaO glasses for visible red laser and scintillation material applications

Aryal, Pabitra,Kesavulu, C.R.,Kim, H.J.,Lee, S.W.,Kang, Sang Jun,Kaewkhao, J.,Chanthima, N.,Damdee, B. Elsevier 2018 Journal of rare earths Vol.36 No.5

<P>Europium (Eu3+) doped glasses of chemical compositions (55-x)B2O3:10SiO(2):25Y(2)O(3):10CaO:xEu(2)O(3), where x denotes mol% and ranges 0 <= x <= 2.5, were synthesized by adopting conventional melt quenching technique. Physical properties like density, molar volume, polaron radius, inter-ionic distance and field strength of the glass samples were investigated to assess the impact of EU2O3. Optical and luminescence properties of the glasses were characterized with optical absorption, photoluminescence, X-ray induced emission spectra, temperature dependence emission spectra and decay times. Judd-Ofelt (JO) intensity parameters (omega(lambda)) of the glasses were evaluated based on the absorption spectrum of 0.5 mol%. JO parameters, calculated from absorption spectra with thermal corrections on oscillator strength, were used to evaluate radiative properties such as radiative transition probability (A(R)), branching ratio (beta(R)), stimulated cross section emission (sigma) and radiative lifetime (tau(R)) for D-5(0) -> F-7(J) (J = 0,1,2,3 and 4) transitions. The decay rate of D-5(0) fluorescent level for all the glass samples was single exponential. Lifetimes of the D-5(0) level were decreased with increasing concentrations of Eu(3+)ions from 0.05 mol% to 2.5 mol% which might be due to energy transfer through cross-relaxation in the glasses. The chromaticity coordinates (x, y) were similar for all BSYCaEu glasses and were located at the red region of CIE 1931 color chromaticity diagram. Hence, these results confirm that the Eu3+ doped BSYCaEu glasses could be useful for visible red lasers and glass scintillation applications. (C) 2017 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.</P>