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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Size dependence of the upconverted luminescence of NaYF4:Er,Yb microspheres for use in ratiometric thermometry
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Size dependence of the upconverted luminescence of NaYF4:Er,Yb microspheres for use in ratiometric thermometry

机译：Nayf4：ER，Yb微球的上络发光的尺寸依赖性，用于比例的测温法

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摘要

The size-dependent temperature sensitivity is observed on the upconversion luminescence of NaYF4:Er,Yb microspheres with sizes between 0.7 and 2 nm that are prepared by a poly(acrylic acid)-assisted hydrothermat process. It is found that the fluorescence intensity ratio (FIR) of their green upconversion emissions (with peaks at 521 and 539 nm) is strongly size-dependent at temperatures between 223 and 403 K. As the size of the spheres increases from 0.7 to 1.6 |im, the maximum sensitivity decreases from 36.8 x 10~(-4) to 24.7 x 10~(-4) K~(-1). This effect is mainly attributed to the larger specific surface area of the smaller spheres where a relatively large number of Er(III) ions are located at the surface. This results in an increase in the efficiency of the ~4S_(3/2)->~2H_(11/2) population process of the Er(III) ions due to stronger electron-phonon interactions with increasing T. Heating of the spheres by NIR light is also supposed to cause enhanced electron-phonon interactions in such particles.
机译：在NayF4：ER的上变频发光，Yb微球的上变化发光，尺寸依赖性温度敏感性在0.7至2nm之间的尺寸，其由聚（丙烯酸） - 兼容水热方法制备。发现其绿色上变化排放的荧光强度比（FIR）（在521和539nm处的峰）在223和403k的温度下依赖于尺寸依赖性。随着球体的尺寸从0.7到1.6增加IM，最大灵敏度从36.8×10〜（-4）降低到24.7×10〜（-4）k〜（-1）。这种效果主要归因于较小球体的较大比表面积，其中相对大量的ER（III）离子位于表面。这导致ER（III）离子的〜4S_（3/2） - >〜2H_（11/2）群体过程的效率的增加，由于较强的电子 - 声子相互作用与增加的球体加热通过NIR光也应该引起这种颗粒中的增强的电子 - 声子相互作用。

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    Bin Dong; Rui N. Hua; Bao S. Cao;

  • 作者单位

    Institute of Nano-Phoionics School of Physics and Materials Engineering Dalian Nationalities University Dalian 116600 P. R. China.;

    School of Life Dalian Nationalities University Dalian 116600 P. R. China;

    Institute of Nano-Phoionics School of Physics and Materials Engineering Dalian Nationalities University Dalian 116600 P. R. China.;

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  • 正文语种 eng
  • 中图分类 物理学;化学;
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