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

doi:10.1088/1674-1056/20/8/087701

Abstract 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 °C. The PL intensity of Er³⁺ ions increases with increasing Ti/Si ratio due to energy transfer between nano-TiO₂ particles and Er³⁺ ions.

Keywords: TiO₂—SiO₂ sol—gel Raman photoluminescence

Received: 11 March 2011
Revised: 19 April 2011
Accepted manuscript online:

PACS:	77.84.Lf	(Composite materials)
	78.55.Hx	(Other solid inorganic materials)
	78.67.-n	(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

Fund: Project supported by the Key Science and Technology Program of Henan Province of China (Grant Nos. 102102210448 and 102102210452) and the Scientific Research Fundation of the Education Department of Henan Province, China (Grant No. 2010A140011).

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Zhao Jian-Guo(赵建果),Zhang Wei-Ying(张伟英),Ma Zi-Wei(马紫微), Xie Er-Qing(谢二庆),Zhao A-Ke(赵阿可),and Liu Zhao-Jun(刘照军) Structure and photoluminescence properties of Er³⁺-doped TiO₂–SiO₂ powders prepared by sol–gel method 2011 Chin. Phys. B 20 087701

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

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