Structure and photoluminescence properties of Er3＋-doped TiO2-SiO2 powders prepared by sol-gel method

Er3＋-doped TiO2-SiO2 powders are prepared by the sol-gel method, and they are characterized by high resolution transmission electron microscopy （HR-TEM）, X-ray diffraction （XRD） spectra, and Raman spectra of the samples. It is shown that the TiO2 nanocrystals are surrounded by an SiO2 glass matrix....

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Bibliographic Details
Published in:Chinese physics B 2011-08, Vol.20 (8), p.429-434
Main Author: Zhao Jian-Guo Zhang Wei-Ying Ma Zi-Wei Xie Er-Qing Zhao A-Ke Liu Zhao-Jun
Format: Article
Language:English
Subjects:
Annealing
Defect annealing
Emission
Nanomaterials
Nanostructure
Photoluminescence
SiO2
Sol-gel processes
Spectra
TiO2粒子
Titanium dioxide
光致发光特性
凝胶法
溶胶
粉末制备
结构
高分辨透射电子显微镜
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Summary:Er3＋-doped TiO2-SiO2 powders are prepared by the sol-gel method, and they are characterized by high resolution transmission electron microscopy （HR-TEM）, X-ray diffraction （XRD） spectra, and Raman spectra of the samples. It is shown that the TiO2 nanocrystals are surrounded by an SiO2 glass matrix. The photoluminescence （PL） spectra are recorded at room temperature. A strong green luminescence and less intense red emission are observed in the samples when they are excited at 325 nm. The intensity of the emission, which is related to the defect states, is strongest at the annealing temperature of 800℃. The PL intensity of Er3＋ ions increases with increasing Ti/Si ratio due to energy transfer between nano-TiO2 particles and Er3＋ ions.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/8/087701