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Zaman, F.,Rooh, G.,Srisittipokakun, N.,Ruengsri, S.,Kim, H.J.,Kaewkhao, J. North-Holland 2016 Journal of non-crystalline solids Vol.452 No.-
<P>In this work, Nd3+-activated soda-lime-borate (SLBNd) glasses are prepared in a composition (65-x) B:10CaO:25Na(2)O:xNd(2)O(3) (where x = 0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol%) by conventional melt-quenching technique, which is its novel study for laser application. The prepared samples are studied by absorption and near-infrared (NIR) luminescence emission spectra and decay-time analysis. The Judd-Ofelt (JO) intensity parameter, Omega(lambda) (lambda = 2,4, 6), and radiative properties of the F-4(3/2) level of Nd3+ ion are calculated from absorption spectra using JO theory. At 585-nm excitation wavelength, strong NIR emission, at 1.069 mu m, is observed corresponding to the F-4(3/2) -> I-4(11/2), for all glass samples. Decay constants are found to be decreasing with increasing Nd3+ concentration due to the energy transfer through cross-relaxation process. The stimulated-emission cross-section (cr(Xp), experimental branching ratio (beta(exp)), gain bandwidth, and quantum efficiency (eta) are measured as 4.0 x 10(-20) cm(2), 68%,1.48 x 10(-25) cm(3) and 65%, respectively. Presented results revealed that Nd3+-activated soda-lime-borate glasses could be useful for 1.06-mu m laser application. (C) 2016 Elsevier B.V. All rights reserved.</P>
Ruamnikhom, R.,Limsuwan, P.,Horprathum, M.,Chanthima, N.,Kim, H. J.,Ruengsri, S.,Kaewkhao, J. Hindawi Limited 2014 Advances In Materials Science And Engineering Vol.2014 No.-
<P>Physical, optical, and luminescence properties of Nd<SUP>3+</SUP>ions in bismuth barium borate glass system were studied. The glasses prepared by a melt quenching method were doped at various Nd2O3concentrations in compositions (40-<I>x</I>)B2O3 : 40Bi2O3 : 20BaO : <I>x</I>Nd2O3(where<I>x</I>= 0.00, 0.50, 1.00, 1.50, 2.00, and 2.50 in mol%). Luminescence properties of the glasses were studied under two excitations of 585 and 750 nm for downconversion. From both excitations, the results show emission bands in NIR region corresponding to the transitions between<SUP>4</SUP>F3/2 → <SUP>4</SUP>I9/2(900 nm),<SUP>4</SUP>F3/2 → <SUP>4</SUP>I11/2(1,060 nm), and<SUP>4</SUP>F3/2 →<SUP> 4</SUP>I13/2(1,345 nm). The luminescence intensity obtained with 585 nm excitation was stronger than 750 nm, with the strongest NIR emission at 1,060 nm. The upconversion emission spectrum exhibits strong fluorescence bands in the UV region at 394 nm ( <TEX>$ \lambda _{\text{ex}}=591$</TEX> nm). The processes are associated with excited state absorption (ESA) from<SUP>4</SUP>F3/2level to<SUP>4</SUP>D3/2level and it is the radiative decay from the<SUP>4</SUP>D3/2to ground levels (<SUP>4</SUP>D3/2 → <SUP>4</SUP>I13/2) which are responsible for the emission at 394 nm.</P>