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Luminescence and thermal-quenching properties of Dy3+-doped Ba2CaWO6 phosphors
Yu, Ruijin,Shin, Dong Soo,Jang, Kiwan,Guo, Yue,Noh, Hyeon Mi,Moon, Byung Kee,Choi, Byung Chun,Jeong, Jung Hyun,Yi, Soung Soo Elsevier 2014 Spectrochimica acta. Part A, Molecular and biomole Vol.125 No.-
A series of new double perovskite tungstate Ba2CaWO6:xDy(3+) (0.01 <= x <= 0.15) phosphors were synthesized via solid state reaction process. XRD analysis confirmed the phase formation of Ba2CaWO6:Dy3+ materials. The photoluminescence excitation and emission spectra, concentration effect, thermal-quenching, and decay property were investigated. The phosphor could be excited by the UV light region from 250 to 400 nm, and it exhibits blue (493 nm) and yellow (584 nm) emission corresponding to F-4(9/2)-H-6(15/2) transitions and F-4(9/2)-H-6(13/2) transitions, respectively. The optimum dopant concentration of Dy3+ ions in Ba2CaWO6:xDy(3+) is around 5 mol% and the critical transfer distance of Dy3+ is calculated as 14 angstrom. The thermal-quenching temperature is 436 K for Ba2CaWO6:0.05Dy(3+). The fluorescence lifetime is also determined in Ba2CaWO6:0.05Dy(3+). (C) 2014 Elsevier B.V. All rights reserved.
Liu, Xiaoshan,Jung, Dawoon,Zhou, Kairu,Lee, Sangwoo,Noh, Kiwan,Khim, Jong Seong,Giesy, John P.,Yim, Un Hyuk,Shim, Won Joon,Choi, Kyungho Elsevier 2018 Marine Pollution Bulletin Vol.127 No.-
<P><B>Abstract</B></P> <P>Endocrine disrupting potentials were assessed for sediment samples collected near <I>Hebei Spirit</I> oil spill (HSOS) site, between December 2007 and January 2012. For comparison, major crude oil (CO) of HSOS, or its weathered form were assessed. Both raw extracts (REs) and their fractionated samples were tested using H295R and MVLN<I>luc</I> bioassays. In H295R cells, REs of crude and weathered oil (WO), and nine of 14 sediments significantly increased E2 levels, which were correlated with the concentrations of PAHs. Steroidogenic disruption potentials of the sediments generally decreased over time. Among silica fractions of all REs, aromatic hydrocarbons (F2) and polar compounds (F3) caused greater E2 levels. While, in MVLN cell bioassay, only three of 14 sediment REs showed estrogen receptor binding potencies, and no temporal trend was observed. In conclusion, oil spill can cause endocrine disruption in the affected ecosystem through steroidogenic alteration for years, and such potencies attenuate over time.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Endocrine disrupting potentials persist in the sediments of Taean coastline even at 5years after Hebei Spirit Oil Spill. </LI> <LI> However, such potencies of the sediment extracts attenuate over time through weathering. </LI> <LI> Sediments collected caused endocrine disruption potentials through disruption in sex steroidogenesis. </LI> <LI> Aromatic hydrocarbons and polar fractions of the oil spill were responsible for the steroidogenic alteration. </LI> </UL> </P>