Controllable synthesis and up-conversion properties of tetragonal BaYF5:Yb/Ln (Ln = Er, Tm, and Ho) nanocrystals
Controllable synthesis and up-conversion properties of tetragonal BaYF5:Yb/Ln (Ln = Er, Tm, and Ho) nanocrystals
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四方 BaYF5:Yb/Ln（Ln = Er、Tm 和 Ho）纳米晶的可控合成和上转换特性
DOI：
10.1016/j.jcis.2011.07.001
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发表时间：
2011-10-15
影响因子：
9.9
通讯作者：
He, Fei
中科院分区：
文献类型：
--
作者：
Niu, Na;Yang, Piaoping;He, Fei
采用水热法成功制备了掺1mol%Ln（3+）（Ln = Er，Tm，Ho）和20mol%Yb（3+）的不同形貌和尺寸的四氟化钇钡（BaYF 5）纳米晶。研究了初始溶液pH值和氟源对产物结构和形貌的影响。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和高分辨透射电子显微镜（HRTEM）对不同条件下制备的样品的尺寸、结构和形貌进行了表征。结果表明，以NaBF_4为F源，在pH = 10的条件下制备的BaYF_5：Yb/Ln纳米晶具有均匀的球形形貌，平均粒径为25 nm。此外，还讨论了Yb/Er、Yb/Tm和Yb/Ho掺杂BaYF 5纳米粒子的上转换特性。在980 nm激光激发下，BaYF 5：Yb/Er、BaYF 5：Yb/Tm和BaYF 5：Yb/Ho纳米晶分别呈现出绿色、白蓝色和黄绿色UC发光。分析了掺杂稀土离子的发光机理。(C)2011 Elsevier Inc. All rights reserved.
The nanocrystals (NCs) of tetragonal barium yttrium fluoride (BaYF5) doped 1 mol% Ln(3+) (Ln = Er, Tm, Ho) and 20 mol% Yb3+ with different morphologies and sizes have been successfully synthesized through a facile hydrothermal method. The influences of pH values of the initial solution and fluorine sources on the final structure and morphology of the products have been well investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM) were used to characterize the size, structure and morphology of these samples prepared at different conditions. And it is found that BaYF5:Yb/Ln NCs prepared at pH value of 10 using NaBF4 as F- source have a uniform spherical morphology with average diameter of 25 nm. Additionally, the up-conversion (UC) properties of Yb/Er, Yb/Tm, and Yb/Ho doped BaYF5 nanoparticles were also discussed. Under 980 nm laser excitation, the BaYF5:Yb/Er, BaYF5:Yb/Tm, and BaYF5:Yb/Ho NCs exhibit green, whitish blue, and yellow green UC luminescence, respectively. The luminescence mechanisms for the doped lanthanide ions were thoroughly analyzed. (C) 2011 Elsevier Inc. All rights reserved.