高分辨率透射电子显微镜
透射电子显微镜
材料科学
发光
四方晶系
镧系元素
钇
兴奋剂
扫描电子显微镜
纳米晶
分析化学(期刊)
水热合成
纳米颗粒
粉末衍射
热液循环
结晶学
离子
纳米技术
晶体结构
化学工程
化学
光电子学
氧化物
冶金
有机化学
复合材料
工程类
色谱法
作者
Na Niu,Piaoping Yang,Yanchao Liu,Chunxia Li,Dong Wang,Shili Gai,Fei He
标识
DOI:10.1016/j.jcis.2011.07.001
摘要
The nanocrystals (NCs) of tetragonal barium yttrium fluoride (BaYF(5)) doped 1 mol% Ln(3+) (Ln=Er, Tm, Ho) and 20 mol% Yb(3+) 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 BaYF(5):Yb/Ln NCs prepared at pH value of 10 using NaBF(4) 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 BaYF(5) nanoparticles were also discussed. Under 980 nm laser excitation, the BaYF(5):Yb/Er, BaYF(5):Yb/Tm, and BaYF(5):Yb/Ho NCs exhibit green, whitish blue, and yellow green UC luminescence, respectively. The luminescence mechanisms for the doped lanthanide ions were thoroughly analyzed.
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