Synthesis and characterization of monodisperse spherical SiO{sub 2}-RE{sub 2}O{sub 3} (RE=rare earth elements) and SiO{sub 2}-Gd{sub 2}O{sub 3}:Ln{sup 3+} (Ln=Eu, Tb, Dy, Sm, Er, Ho) particles with core-shell structure

Journal Article · Thu Oct 15 04:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.07.033· OSTI ID:21372337

Wang, H; Yang, J; Zhang, C M ^[1]; Lin, J ^[1]

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1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China)

Spherical SiO{sub 2} particles have been coated with rare earth oxide layers by a Pechini sol-gel process, leading to the formation of core-shell structured SiO{sub 2}-RE{sub 2}O{sub 3} (RE=rare earth elements) and SiO{sub 2}-Gd{sub 2}O{sub 3}:Ln{sup 3+} (Ln=Eu, Tb, Dy, Sm, Er, Ho) particles. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), photoluminescence (PL), and cathodoluminescence spectra as well as lifetimes were used to characterize the resulting SiO{sub 2}-RE{sub 2}O{sub 3} (RE=rare earth elements) and SiO{sub 2}-Gd{sub 2}O{sub 3}:Ln{sup 3+} (Eu{sup 3+}, Tb{sup 3+}, Dy{sup 3+}, Sm{sup 3+}, Er{sup 3+}, Ho{sup 3+}) samples. The obtained core-shell phosphors have perfect spherical shape with narrow size distribution (average size ca. 380 nm), smooth surface and non-agglomeration. The thickness of shells could be easily controlled by changing the number of deposition cycles (40 nm for two deposition cycles). Under the excitation of ultraviolet, the Ln{sup 3+} ion mainly shows its characteristic emissions in the core-shell particles from Gd{sub 2}O{sub 3}:Ln{sup 3+} (Eu{sup 3+}, Tb{sup 3+}, Sm{sup 3+}, Dy{sup 3+}, Er{sup 3+}, Ho{sup 3+}) shells. - Graphical abstract: The advantages of core-shell phosphors are the easy availability of homogeneous spherical morphology in different size, and its corresponding luminescence color can change from red, yellow to green.

• OSTI ID: 21372337
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 10 Vol. 182; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CATHODOLUMINESCENCE
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
DEPOSITION
DIFFRACTION
DYSPROSIUM IONS
ELECTRON MICROSCOPY
ELEMENTS
EMISSION
ERBIUM IONS
EUROPIUM IONS
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
HOLMIUM IONS
IONS
LUMINESCENCE
METALS
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHOTOLUMINESCENCE
PHOTON EMISSION
RARE EARTH COMPOUNDS
RARE EARTHS
SAMARIUM IONS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SHELLS
SILICON COMPOUNDS
SILICON OXIDES
SOL-GEL PROCESS
SYNTHESIS
TERBIUM IONS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION