NDLI: Facile fabrication and photoluminescence properties of rare-earth-doped $Gd_{2}O_{3}$ hollow spheres via a sacrificial template method

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Xu, Zhenhe Gao, Yu Zhao, Qian Fang, Qinghong
Description	Author Affiliation: Gao Y ( College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang, 110142, PR China. gaoy777@126.com)
Abstract	Rare-earth-doped gadolinium oxide $(Gd_{2}O_{3})$ hollow spheres were successfully fabricated on a large scale by using PS spheres as sacrificed templates and urea as a precipitating agent, which involved the deposition of an inorganic coating $Gd(OH)CO_{3}$ on the surface of PS spheres and subsequent calcination in the air. Various approaches including X-ray diffraction ( XRD ), scanning electron microscopy ( SEM ), transmission electron microscopy ( TEM ), Fourier transform infrared (FT-IR) , thermogravimetric and differential thermal analysis ( TG-DTA ), as well as photoluminescence spectroscopies were used to characterize the samples. The results indicate that the sample is composed of uniform hollow $Gd_{2}O_{3}$ spheres with a mean particle size of about 2.3 μm and these hollow spheres have the mesoporous shell that are composed of a large amount of nanoparticles . The possible mechanism of evolution from PS spheres to the amorphous precursor and to the final hollow $Gd_{2}O_{3}$ spheres have been proposed. The as-obtained samples show strong light emission with different colors corresponding to different $Ln^{3+}$ ions under ultraviolet-visible light and electron-beam excitation. Under 980 nm NIR irradiation, $Gd_{2}O_{3}:Ln^{3+}$ $(Ln^{3+}$ = $Yb^{3+}/Er^{3+},$ $Yb^{3+}/Tm^{3+}$ and $Yb^{3+}/Ho^{3+})$ exhibit characteristic up-conversion (UC) emissions of red $(Er^{3+},$ $^{2}H_{11/2},$ $^{4}S_{3/2},$ $^{4}F_{9/2}$ → $^{4}I_{15/2}),$ blue $(Tm^{3+},$ $^{1}G_{4}$ → $^{3}H_{6})$ and green $(Ho^{3+},$ $^{5}F_{4},$ $^{5}S_{2}$ → $^{5}I_{8}),$ respectively. These merits of multicolor emissions in the visible region endow these kinds of materials with potential applications in the field of light display systems, lasers, optoelectronic devices, and MRI contrast agents .
ISSN	14779226
Issue Number	31
Volume Number	42
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2013-08-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Gadolinium Chemistry Metals, Rare Earth Infrared Rays Microspheres Particle Size Polystyrenes Spectrophotometry, Ultraviolet Spectroscopy, Fourier Transform Infrared Ultraviolet Rays Journal Article
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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