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Sun D.-H.,Changchun Institute of Technology | Zhang J.-L.,State Key Laboratory of Rare Earth Resource Utilization | Sun D.-X.,Changchun Institute of Technology
Journal of Nanoscience and Nanotechnology | Year: 2010

Monoclinic monazite-type EuPO 4 and LaPO 4:Eu nanorods were synthesized by a microemulsionassisted solvothermal method. Their morphologies, structures, and fluorescent properties were characterized by SEM, XRD, and photoluminescence (PL) modern analytic means, respectively. The aspect ratios of EuPO 4 and LaPO 4:Eu nanorods have a decreasing tendency with increasing carbon chain length of assisted surfactants. When the assisted surfactant was n-butyl alcohol, the EuPO 4 exhibited nanorod morphology with diameters from 20 to 30 nm and lengths from 100 to 150 nm. When the assisted surfactant was n-pentanol, the EuPO 4 nanorods had lengths between 200 and 300 nm and a diameter range similar to that of the n-butyl alcohol nanorods. When the assisted surfactant was n-hexanol and n-octyl alcohol, only elliptical EuPO 4 products were obtained. The LaPO 4:Eu nanorods synthesized in the presence of different assisted-surfactants exhibited elliptical morphologies with diameters of 40-60 nm and lengths of 70-110 nm. The LaPO 4:Eu and EuPO 4 nanorods showed a orange prominent emission peak from magnetic-dipole transition 5D 0 → 7F 1 (593 nm) of Eu 3+ ions whose sites in the EuPO 4 and LaPO 4:Eu nanorods have C 1 symmetry. Compared with bulk LaPO 4:Eu, the fine structure of the Eu-O charge transfer band has very small red shift resulting from the slight increase of the length of Eu-O bond due to nanoscale size effect. Copyright © 2010 American Scientific Publishers All rights reserved. Source


Ren H.,Changchun Institute of Technology | Yang H.,Changchun Institute of Technology | Sun D.,Changchun Institute of Technology | Cui Z.,Changchun Institute of Technology | Hong G.,State Key Laboratory of Rare Earth Resource Utilization
Applied Mechanics and Materials | Year: 2012

Rare earth europium (Eu(III))-pyromellitic acid (H 4L)-1,10- phenanthroline (phen) ternary luminescent complex has been synthesized in polyvinylpyrrolidone (PVP) matrix by precipitation method. The chemical constitution of the complex has been demonstrated as PVP/EuL 4/3L(phen)·2H 2O by a combination of elemental analysis, inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and Fourier-transform infrared spectroscopy (FT-IR). X-ray diffraction analysis (XRD) has shown that the complex is a new kind of crystal whose structure is totally different from two ligands. The morphology of the complex has been investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results have shown that the complex has a rodlike crystal structure and the diameter of the rod is about 400 nm. Thermogravimetric analysis (TG) has indicated that the luminescent complex is thermally stable below 300 °C. Photoluminescence spectra (PL) have revealed that the complex can emit Eu 3+ characteristic red fluorescence under ultraviolet excitation. Source


Ren H.,Changchun Institute of Technology | Sun D.,Changchun Institute of Technology | Cui Z.,Changchun Institute of Technology | Yang M.,State Key Laboratory of Rare Earth Resource Utilization | Hong G.,State Key Laboratory of Rare Earth Resource Utilization
Journal of Rare Earths | Year: 2010

The terbium(III)-pyromellitic acid(H4L)-1,10- phenanthroline(phen) luminescent complex was synthesized using a co-precipitation method. The chemical composition of the synthesized complex was speculated to be Tb4L3(phen) 0.075·10H2O by elemental analysis, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and Fourier-transform infrared spectroscopy (FT-IR). The X-ray diffraction analytic results indicated that the synthesized complex is a new crystalline complex, whose structure was different from those of other two ligands. The scanning electron microscopy analytic results showed that the product was of spherical crystals with good dispersion property, and the mean diameter of the spheres was about 1-2 μm. The TG-DTA result showed that the complex had good stability below 489 °C. PL spectra showed that the complex emitted characteristic green fluorescence of Tb(III) ion under ultraviolet excitation. © 2010 The Chinese Society of Rare Earths. Source


Cui Z.,Changchun Institute of Technology | Ren H.,Changchun Institute of Technology | Sun D.,Changchun Institute of Technology | Yang M.,State Key Laboratory of Rare Earth Resource Utilization | Hong G.,State Key Laboratory of Rare Earth Resource Utilization
Journal of Nanoscience and Nanotechnology | Year: 2011

The luminescent complex terbium (III)-trimesic acid (TMA)-1,10- phenanthroline (phen) nanorod was synthesized in the polyvinylpyrrolidone (PVP) matrix by a co-precipitation method. The chemical formula of the synthesized complex was speculated to be PVP/TbL(phen) 0.5 .7H 2O by inductively coupled plasma-atomic emission spectroscopy (ICP-AES), elemental analysis and Fourier-transform infrared spectroscopy (FTIR). The X-ray diffraction pattern (XRD) of PVP/TbL(phen) 0.5 .7H 2O indicated that it was a crystalline complex. The transmission electron microscopy (TEM) result showed that the complex was nanorods with diameters of about 80-100 nm. The thermogravimetric curve (TGA) analysis exhibited that the complex has good stability below 400 °C. UV-Vis diffuse reflectance spectra showed that there is a maximum absorption at 300 nm. The photoluminescence analyses (PLA) showed that the synthesized complex emitted the characteristic green fluorescence of Tb (III) ions under ultraviolet light excitation. The emission peaks of PVP/TbL(phen) 0.5 .7H 2O at 488, 542, 581, and 618 nm using 278 nm as exciting wavelength can be assigned to the 5D 4→ 7F 6, 5D 4 → 7F 5, 5D 4 → 7F 4, and 5D 4 → 7F 3 electron transitions of the Tb 3+ ions, respectively. © 2011 American Scientific Publishers. All rights reserved. Source


Ren H.,Changchun Institute of Technology | Cui Z.,Changchun Institute of Technology | Yang M.,State Key Laboratory of Rare Earth Resource Utilization | Liu J.,Changchun Institute of Technology | Hong G.,State Key Laboratory of Rare Earth Resource Utilization
Journal of Nanoscience and Nanotechnology | Year: 2010

The rare earth ion europium(III) was chosen as the central fluorescent ion, and phthalic acid (H 2L) was chosen as the ligand. The rod-like phthalic europium(III) fluorescent complex was synthesized using a co-precipitation method in a polyvinylpyrrolidone (PVP) aqueous medium. The chemical composition of the synthesized complex was speculated to be PVP/Eu 2L 3 · 3H 2O by elemental analysis, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and Fourier-transform infrared spectroscopy (FT-IR). The X-ray diffraction analytic (XRD) results indicated that the synthesized complex is a crystalline substance, and the scanning electron microscopy (SEM) analytic results showed that the synthesized complex is nanorod with an average size of about 40 nm. The thermogravimetry and differential thermal analysis (TG-DTA) result showed that the nanoscale complex has good stability below 449 °C. Photoluminescence spectra (PL) spectra showed that the nanoscale complex emitted characteristic red luminescence of Eu (III) under ultraviolet light. Copyright © 2010 American Scientific Publishers All rights reserved. Source

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