Synthesis and luminescent properties of monodisperse core–shell structured SiO2@Lu2O3:Eu3+ microspheres

Highly monodispersed SiO2@Lu2O3:Eu3+ core–shell microspheres were successfully synthesized by coating the Lu2O3:Eu3+ nanoparticles onto the surface of non-aggregated spherical SiO2 particles via a simple solvothermal method, followed by a subsequent calcination process. The as-prepared phosphors wer...

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Bibliographic Details
Published in:Powder technology 2014-05, Vol.258, p.174-179
Main Authors: Wang, Guowei, Zou, Haifeng, Gong, Lina, Shi, Zhan, Xu, Xuechun, Sheng, Ye
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Europium
Exact sciences and technology
Luminescence
Miscellaneous
SiO2@Lu2O3
Solid-solid systems
Solvothermal
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Summary:Highly monodispersed SiO2@Lu2O3:Eu3+ core–shell microspheres were successfully synthesized by coating the Lu2O3:Eu3+ nanoparticles onto the surface of non-aggregated spherical SiO2 particles via a simple solvothermal method, followed by a subsequent calcination process. The as-prepared phosphors were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrum (FT-IR), thermal analysis (TGA-DSC), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectrometry (EDS), selected area electron diffraction (SAED), high resolution transmission electron microscopy (HRTEM), and photoluminescence spectra (PL). The as-obtained core–shell microspheres show strong red emission corresponding to the 5D0→7F2 transition of the Eu3+ ions under ultraviolet (UV) excitation, which may have potential applications in light-emitting phosphors, field emission displays, advanced flat panel displays and biological labeling. This picture is the illustration for the formation process of the SiO2@Lu2O3:Eu3+ composite microspheres. Well-dispersed and uniform silica cores were used as template, and then a continuous europium-doped lutetium oxide precursor shells were homogeneously coated over the silica spheres template. At last, SiO2@Lu2O3:Eu3+ composite microspheres were obtained by calcinating the corresponding precursors at 800°C for 2h in air. [Display omitted] •SiO2@Lu2O3:Eu3+ core–shell microspheres were prepared via a mild solvothermal method.•SiO2@Lu2O3:Eu3+ core–shell microspheres are monodisperse, uniform and submicron scale.•The obtained core–shell microspheres exhibit excellent red-luminescent properties.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2014.03.035