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Vol. 26 No. 8 (2014): Vol 26 Issue 8

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Fabrication and Photoluminescence Properties of Monodispersed SiO2@SrAl2Si2O2:Eu2+ Core-Shell Submicron Spheres

https://doi.org/10.14233/ajchem.2014.15656
J.M. Zhang
State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, P.R. China
D.L. Zhao
State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, P.R. China
D.D. Zhang
State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, P.R. China
Z.M. Shen
State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, P.R. China

Corresponding Author(s) : D.L. Zhao

dlzhao@mail.buct.edu.cn

Asian Journal of Chemistry, Vol. 26 No. 8 (2014): Vol 26 Issue 8

Abstract

Nanocrystalline SrAl2Si2O8:Eu2+ phosphor layers were coated on the surface of preformed submicron silica spheres by sol-gel method. The resulted monodispersed SiO2@SrAl2Si2O8:Eu2+ core-shell submicron spherical phosphors were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and photoluminescence spectra. The XRD results demonstrated that the SrAl2Si2O8:Eu2+ layers began to crystallize on the SiO2 spheres at 900 °C and the crystallinity increased with raising the annealing temperature. The obtained monodispersed core-shell spherical phosphors have perfect spherical shape with narrow size distribution (average size 500 nm). The Eu2+ shows a strong photoluminescence (dominated by 4f65d1 ® 4f7 red emission at 390 nm) due to an efficient energy transfer from vanadate groups to Eu2+. The photoluminescence intensity of Eu2+ increases with raising the annealing temperature.

Keywords

Phosphers Nanostructures Sol-gel processes Optical properties X-ray diffraction
Zhang, J., Zhao, D., Zhang, D., & Shen, Z. (2014). Fabrication and Photoluminescence Properties of Monodispersed SiO2@SrAl2Si2O2:Eu2+ Core-Shell Submicron Spheres. Asian Journal of Chemistry, 26(8), 2211–2214. https://doi.org/10.14233/ajchem.2014.15656
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