Synthesis and characterization of core–shell structured SiO2@YVO4:Yb3+,Er3+ microspheres

• DOI: 10.1016/j.apsusc.2011.12.006
• Publication Date: 2011-12-11T08:09:02Z
• Authors: Yanjie Liang; Jun Ouyang; Hongyou Wang; Weili Wang; Pengfei Chui; Kangning Sun
• Keywords: Photoluminescence excitation; Energy-dispersive X-ray spectroscopy

Abstract In this paper, the core–shell structured SiO 2 @YVO 4 :Yb 3+ ,Er 3+ microspheres have been successfully prepared via a facile sol–gel process followed by a heat treatment. X-ray diffraction, field emission scanning electron microscopy, energy disperse X-ray spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and photoluminescence spectra were used to characterize the samples. The results reveal that the SiO 2 spheres have been successfully coated by YVO 4 :Yb 3+ ,Er 3+ phosphors to form core–shell structures and the size of obtained microspheres has a uniform distribution. Additionally, the samples exhibit bright green luminescence under the excitation of a 980 nm laser diode. The photoluminescence intensity increases with the number of coatings. These core–shell structured SiO 2 @YVO 4 :Yb 3+ ,Er 3+ microspheres may have great potential in the fields of infrared detection and display devices.