Papers by Keyword: Europium (Eu)

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Authors: Roland Weingärtner, Oliver Erlenbach, Francisco De Zela, Albrecht Winnacker, Isabel Brauer, Horst P. Strunk
Abstract: We present comprehensive cathodoluminescence measurements from thin amorphous a- SiC films doped with rare earths. The a-SiC films were prepared by rf magnetron sputtering using a high purity SiC wafer in high purity argon atmosphere (5N, pressure approx. 0.2 mbar). The rare earth doping (Tb, Dy and Eu concentrations were below 2%) was performed by placing respective rare earth metal pieces of appropriate size onto the Silicon Carbide wafer. The rare earth ion emissions cover the colors green (Tb), yellow (Dy) and red (Eu). The optical and related structural properties of the films are correlated by means of high resolution transmission electron microscopy in combination with cathodoluminescence measurements in a scanning electron microscope. In addition, the corresponding compositions are determined by energy-dispersive x-ray analysis. The cathodoluminescence spectra of the rare earth 3+ ions are recorded in the visible at 20°C in the asgrown condition and after annealing treatments in the temperature range from 300°C to 1050°C by steps of 150°C. The anneal-related changes in the cathodoluminescence emission spectra and in the microstructure of the films are addressed. The SiC films show amorphous structure almost independent of the annealing treatment. Optimal annealing temperature for emissions of Tb3+ doped a-SiC were derived to be 600°C whereas Dy3+ and Eu3+ emissions increase at least up to 1050°C.
Authors: P.T.A. Santos, Cristiane M. Furtado, M.O. Rodrigues, A.C.F.M. Costa
Abstract: ZnAl1.,9Eu0.1O4 nanoparticles were functionalization used of the 3-aminopropyltrimethoxysilane silane and chitosan, in 5:1 proportion of the nanoparticles to chitosan, in order to obtain hybrid materials for the development of luminescent markers. The samples were characterized by XRD, FTIR, TEM, excitation and emission. After functionalized the nanoparticles showed formation of crystalline phase of spinel and chitosan. TEM results have revealed that the samples presented before particle size less than 100 nm and after functionalization was observed that the particle size increases. Emission peak of Eu centered at 614 nm, corresponding to the transition 5D0 7F2. Nanoparticles before and after functionalization showed the spectral lines characteristics of Eu ion 5D0 7Fj where (J = 0,1,2,3,4). After functionalization the sample presented an increase of luminescence intensity.
Authors: Bo Xue, Hong Li, Yun Fen Shi
Abstract: EuPO4 nanoparticle was synthesized using chitosan induced mechanism. The nanoparticles were formed after calcination inside a fiber template. The nanoparticles were characterized by Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD) and Fluorespectrometer. The synthesized EuPO4 nanoparticles with nano-pore structures presented the excitation peaks located at about 375nm and 500nm and the emission peaks located at 590-620nm and 750nm, respectively. Live imaging was performed in in-vitro cell culture. The nanoparticles were biocompatible and could be intake by cells. Cells with nanoparticles showed fluorescent signals for imaging, which indicate the potential application of these particles for live imaging.
Authors: Akira Suzuki, Shinobu Fujihara, Toshio Kimura
Authors: Zhao Ye Li, Zhao Jun Xue, Li Jun Kong, Jin He
Abstract: Diameters of self-assembled micelles were discussed carefully in this paper. When block copolymer was crossed by Eu (III) ions, they could be assembled into micelles. Then diameters of micelles increased with increasing molar ratios of Phen.
Authors: Katsuya Kawano, N. Hashimoto, R. Nakata
Authors: Yan Hong Zhao, Chun Mei Zhang, Ting Liu, Qiang Qiang Du, Sheng Liang, Xiao Jing Wang
Abstract: Europium doped tantalum oxide (europium-Ta2O5) particles were synthesized with a low temperature hydrothermal method. The electrochemical behaviour of an europium-Ta2O5 film electrode in 0.1 mol dm-3 KCl solution containing 5 mmol dm-3 K3Fe(CN)6 was investigated using cyclic voltgrammetry (CV). The CV results indicated that the europium-Ta2O5 film electrode exhibited good stable and reversible electrochemistry properties. The electrochemical reaction of K3Fe(CN)6 was a diffusion-controlling process on the europium-Ta2O5 film electrode. The europium-Ta2O5 particles might have potential applications in electrochemical fields.
Authors: N.V. Gaponenko, I.S. Molchan, A.A. Lutich, S.V. Gaponenko
Abstract: Xerogels doped with lanthanides embedded in mesoporous matrices are known to exhibit intensive lanthanides-related photoluminescence (PL). In this paper we report on novel features peculiar to porous anodic alumina and Eu-doped xerogels embedded therein. For Eu-doped titania xerogel fabricated in a single spin-on step Eu PL increases with the thickness of porous anodic alumina ranging from 0.5 to 5 μm. The structure Eu-doped titania xerogel/porous anodic alumina reveal anisotropy of luminescence at 617 nm (5D07F2 transitions of Eu3+) with a pronounced maximum towards the channels of the anodic alumina pores. Furthermore, a membrane of porous anodic alumina reveals strong anisotropy of light scattering. Development of these anisotropic properties for the purpose of further PL enhancement of optically active inclusions incorporated in mesoscopic channels of anodic alumina is discussed.
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