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Fabrication and photoluminescence properties of core-shell structured spherical SiO2@Gd2Ti2O7:Eu3+ phosphors

Published online by Cambridge University Press:  03 March 2011

Guangzhi Li ,
Min Yu ,
Rongshun Wang ,
Zhenling Wang ,
Zewei Quan  and
Jun Lin
Guangzhi Li
Affiliation:
Department of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China; and Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
Min Yu
Affiliation:
Department of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China
Rongshun Wang*
Affiliation:
Department of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China
Zhenling Wang
Affiliation:
Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
Zewei Quan
Affiliation:
Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
Jun Lin
Affiliation:
Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
*
a) Address all correspondence to these authors. e-mail: [email protected]
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Abstract

A sol-gel technique was used to prepare Gd2Ti2O7:Eu3+-coated submicron silica spheres (SiO2@Gd2Ti2O7:Eu3+). The resulted SiO2@Gd2Ti2O7:Eu3+ core-shell particles were characterized by x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy-dispersive x-ray spectra (EDS), transmission electron microscopy (TEM), photoluminescence (PL) spectra, as well as kinetic decays. The XRD results demonstrate that the Gd2Ti2O7:Eu3+ layers begin to crystallize on the SiO2 spheres after annealing at 800 °C and the crystallinity increases with raising the annealing temperature. The obtained core-shell phosphors have perfect spherical shape with narrow size distribution (average size ∼620 nm), non-agglomeration, and smooth surface. The thickness of the Gd2Ti2O7:Eu3+ shells on the SiO2 cores could be easily tailored by varying the number of deposition cycles (60 nm for four deposition cycles). Under the irradiation of 310 nm ultraviolet, the SiO2@Gd2Ti2O7:Eu3+ samples show strong emission of Eu3+. For the samples annealed from 600 to 800 °C, the emission is dominated by 613 nm red emission ascribed to 5D0–7F2 transition of Eu3+, while for those annealed from 900 to 1000 °C, the emission is dominated by 588 nm orange emission due to 5D0–7F1 transition of Eu3+. The PL intensity of Eu3+ increases with increasing the annealing temperature and the number of coating cycles.

Keywords

Core/shellLuminescenceSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 9 , September 2006 , pp. 2232 - 2240
Copyright
Copyright © Materials Research Society 2006

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