阴极发光
相关
原位
纳米颗粒
电子显微镜
材料科学
纳米技术
显微镜
热的
光学
化学
光电子学
物理
发光
语言学
哲学
有机化学
气象学
作者
Mingxing Li,Xiaoge Wang,Xiaofeng Cao,Zhengjie He,Chunjun Liang,Jianhua Ju,Fangtian You
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2024-01-01
摘要
NaYF4 systems have been widely studied as up-conversion host matrices, and their phase transitions are flexible and worth investigating in great detail. Herein, the evolution of morphology and crystal structure of a Eu3+-doped β-NaYF4 single nanoparticle heated in an air atmosphere was investigated using in situ transmission electron microscopy (TEM). The annealing process revealed that the hexagonal β-NaYF4 phase undergoes sequential transformations into high-temperature cubic phases at both 350 °C and 500 °C. The emission characteristics of Eu3+ in the single nanoparticle after heating treatment were also analyzed using Correlative Cathodoluminescence Electron Microscopy (CCLEM). The results of CCLEM suggest a gradual decrease followed by a subsequent increase in structural symmetry. A comprehensive spectroscopic and structural analysis encapsulates the entire transformation process as NaYF4 → YOF → Y2O3. In situ energy dispersive spectroscopy analyses (EDS) support this reaction process. The aforementioned technique yields correlative lattice-resolved TEM images and nanoscale spectroscopic information, which can be employed to assess the structure-function relationships on the nanoscale.
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