NaRF4-NaR'F4（R：Y、Yb、Er）核壳纳米材料的上转换发光。
Up-conversion luminescence of the NaRF4-NaR'F4 (R: Y, Yb, Er) core-shell nanomaterials.
机构信息
Department of Chemistry, University of Turku, FI-20014 Turku, Finland.
出版信息
J Fluoresc. 2011 May;21(3):963-9. doi: 10.1007/s10895-010-0655-8. Epub 2010 May 9.
Up-converting NaRF(4)-NaR'F(4) (R: Y, Yb, Er) nanomaterials with different core-shell combinations were prepared with the co-precipitation method. The X-ray powder diffraction (XPD) measurements revealed the presence of both the cubic and hexagonal NaRF(4) phases. The crystallite sizes calculated with the Scherrer formula were 100 and 150 nm for the cubic and hexagonal phases, respectively. The FT-IR spectra showed water impurities. The up-conversion luminescence and luminescence decays were studied with NIR laser excitation at 970 nm. The up-conversion luminescence spectra showed strong red (640-685 nm) ((4)F(9/2) → (4)I(15/2)) and moderate green (515-560 nm) ((2)H(11/2,) (4)S(3/2) → (4)I(15/2)) Er(3+) luminescence. The strongest up-conversion luminescence and longest red luminescence decay was obtained from the Na(Y,Yb)F(4)-NaErF(4) core-shell combination.
采用共沉淀法制备了具有不同核壳组合的上转换 NaRF(4)-NaR'F(4)（R：Y、Yb、Er）纳米材料。X 射线粉末衍射（XPD）测量表明存在立方相和六方相 NaRF(4)。用谢乐公式计算的晶粒尺寸分别为立方相和六方相的 100nm 和 150nm。FT-IR 光谱显示存在水杂质。用 970nm 的近红外激光激发研究了上转换发光和荧光衰减。上转换发光光谱显示出强的红色（640-685nm）（(4)F(9/2)→(4)I(15/2))和中等的绿色（515-560nm）((2)H(11/2,) (4)S(3/2)→(4)I(15/2))Er(3+)发光。Na(Y,Yb)F(4)-NaErF(4)核壳组合获得了最强的上转换发光和最长的红色荧光衰减。
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