Preparation of spherical core-shell structured SiO2aMoO4:Eu3+,Li+ red phosphors

Uniform spherical core-shell structured SiO2aMoO4:Eu3+,Li+ phosphors were prepared by a combined homogeneous precipitation approach and combustion synthesis. CaMoO4:Eu3+,Li+ layer was grown onto submicrometer amorphous SiO2 particles, which were synthesized by the Stoeber method, via a homogeneous p...

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Bibliographic Details
Published in:Journal of alloys and compounds 2013-11, Vol.576, p.227-231
Main Authors: Peng, Gui-hua, Wang, Xia, Liang, Zhen-hua, Wang, Yu-chen, Han, Xiao-bao, Wu, Jing-long
Format: Article
Language:English
Subjects:
Combustion synthesis
Phosphors
Precipitation
Scanning electron microscopy
Scanning transmission electron microscopy
Silicon dioxide
X-rays
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Summary:Uniform spherical core-shell structured SiO2aMoO4:Eu3+,Li+ phosphors were prepared by a combined homogeneous precipitation approach and combustion synthesis. CaMoO4:Eu3+,Li+ layer was grown onto submicrometer amorphous SiO2 particles, which were synthesized by the Stoeber method, via a homogeneous precipitation technique. The following combustion reaction at 600 degree C and simply post-annealing resulted in uniform spherical SiO2aMoO4:Eu3+,Li+ core-shell structured phosphors. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), scanning transmission electron microscopy (STEM), energy-dispersive X-ray spectra (EDS), and photoluminescence (PL). The results show that the amorphous SiO2 submicrospheres were coated by crystalline CaMoO4:Eu3+,Li+ nanoparticles, forming spherical core-shell structure with uniform size of a14260 nm. The powder samples showed strong red emission corresponding to 5D0 a 7F2 transitions of Eu3+ ions under near ultraviolet (UV) or blue light. Their color coordinate (0.63, 0.36) is close to the standard of national television standards committee (NTSC) (0.67, 0.33).
ISSN:0925-8388
DOI:10.1016/j.jallcom.2013.04.127