高分辨率透射电子显微镜
透射电子显微镜
光子上转换
发光
材料科学
扫描电子显微镜
光致发光
热液循环
水热合成
化学工程
氟化物
分析化学(期刊)
形态学(生物学)
纳米技术
化学
光电子学
无机化学
复合材料
有机化学
工程类
生物
遗传学
作者
Mingye Ding,Yanwei Zeng,Daqin Chen,Jiasong Zhong,Yaru Ni,Chunhua Lu,Zhongzi Xu,Zhenguo Ji
标识
DOI:10.1016/j.apsusc.2015.01.240
摘要
Hexagonal NaYF4 crystals with a variety of well-defined morphologies and sizes have been successfully synthesized through the precise manipulation of a series of experimental conditions, such as pH values and fluoride sources. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and photoluminescence spectra (PL) were used to characterize the final products. It is found that the intrinsic structure of NaYF4, the pH values and fluoride sources are responsible for the ultimate shape evolution of the final samples. The possible formation mechanism for β-NaYF4 samples with various morphologies has been proposed on the basis of XRD analysis and SEM investigation of the samples obtained at different reaction time periods. Additionally, the upconversion (UC) luminescence properties of Yb3+/Er3+ co-doped β-NaYF4 samples with different shapes have been systematically investigated and discussed. This study is expected to provide important information for morphology-controlled synthesis of other complex rare earth fluoride compounds.
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