Fluorescence quantum yield of Gd_(0.9-x)R_xEu_(0.1)OOH(R=Y, La) crystals

查看全文 作　　者：Hiroaki [1]Samata;Katsutoshi [1]Kobayashi;Masashi [1]Hanioka;Tadashi [2]C.Ozawa

机构地区：[1]Graduate School of Maritime Sciences, Kobe University;[2]Materials Development Group, Superconducting Properties Unit, National Institute for Materials Science

出　　处：《Journal of Rare Earths》索引2015年第33卷第12期,共5页

基　　金：supported by Japan Society for the Promotion of Science(JSPS)KAKENHI Grants(21560696;24560827) 摘　　要：Gd_(0.9-x)R_xEu_(0.1)OOH(R=Y,La) crystals were synthesized by a flux method using a mixture of NaOH and KOH as the flux.X-ray diffraction data were well refined using the Rietveld method assuming that the crystals had a monoclinic structure belonging to the P2_1/m space group.The unit cell volumes of the Gd_(0.9-x)La_xEu_(0.1)OOH crystals increased with increasing x,whereas those of Gd_(0.9-x)Y_xEu_(0.1)OOH decreased with increasing x.The Commission Internationale de I'Eclairage(CIE) chromaticity coordinates of Gd_(0.9-x)R_xEu_(0.1)OOH(R=Y,La) crystals were located in the red region and were nearly constant over the range of x values considered.The fluorescence quantum yield Φ_f monotonically decreased with increasing x regardless of the ionic radii of the substitute ions.The fact that the Φ_f value of La_(0.9)Eu_(0.1)OOH was greater than that of Gd_(0.9)Eu_(0.1)OOH indicated that the observed decrease in the Φ_f values of the Gd_(0.9-x)La_xEu_(0.1)OOH crystals up to x=0.3 could not be attributed to an increase in the distance between Eu^(3+) ions or to a decrease in the Gd^(3+) content.The decrease might be due to an increase of killer centers introduced by elemental substitutions with the larger ion. 关键词：荧光量子产率晶体 LA RIETVELD方法离子半径 NAOH 单斜结构衍射数据

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Fluorescence quantum yield of Gd_(0.9-x)R_xEu_(0.1)OOH(R=Y, La) crystals

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