Synthesis, Characterization and Properties of Rare Earth Complexes with Caprolactam

2014 ◽  
Vol 707 ◽  
pp. 73-76
Author(s):  
Hui Fang Yang ◽  
Shu Xia Ren ◽  
Lei Sun ◽  
Huang Li
Keyword(s):  
Differential Scanning Calorimetry ◽  
Rare Earth ◽  
Fluorescence Spectra ◽  
Rare Earth Ions ◽  
Rare Earth Complexes ◽  
Scanning Calorimetry ◽  
Solid State Method ◽  
State Method ◽  
Differential Thermogravimetry ◽  
The Eu

Three rare earth complexes of (Eu (C6H11NO)8, La0.6Eu0.4(C6H11NO)6, Tb0.5Eu0.5(C6H11NO)6(H2O)) were synthesized by solid-state method. The as-prepared complexes were characterized by elemental analysis, thermogravimetry-differential thermogravimetry-differential scanning calorimetry (TG-DTG-DSC), infrared (IR) spectra and fluorescence spectra. The results showed that complexed were prepared by the rare earth ions directly bonded to oxygen atoms of caprolactam ligand and emitted a characteristic fluorescence of the Eu3 +or Tb3+ions.

Spectra Analysis of some Europium(III)/Terbium(III) Complexes

2016 ◽  
Vol 680 ◽  
pp. 558-561
Author(s):  
Wei Yang ◽  
Qiang Li ◽  
Yan Yan Zhang ◽  
Dan Yu Jiang ◽  
Jin Feng Xia
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Rare Earth Ions ◽  
Rare Earth Complexes ◽  
Spectra Analysis ◽  
Ultraviolet Spectra ◽  
Hydroxy Quinoline

a series of Eu(III)/Tb(III) complexes with а-thenoyl trifluoroacetone (HTTA), 8-hydroxy quinoline complexes were synthesized. The UV and fluorescence spectra of these complexes at room temperature were characterized. The results revealed that different energy transfer between rare earth ions and ligands.Keywords rare earth complexes, ultraviolet spectra, fluorescence spectra

Using rare earth ions to improve the luminescence properties of the defect-related luminescent material Zn3Al2Ge2O10

2017 ◽  
Vol 41 (15) ◽  
pp. 7400-7406 ◽  
Author(s):  
Qiongyu Bai ◽  
Zhijun Wang ◽  
Panlai Li ◽  
Shuchao Xu ◽  
Ting Li ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Solid State ◽  
Rare Earth Ions ◽  
Luminescence Properties ◽  
Luminescent Material ◽  
Solid State Method ◽  
White Emission ◽  
State Method

Herein, Zn3Al2Ge2O10 was synthesized by a high-temperature solid-state method, and a weak white emission ranging from 350 to 600 nm was observed.

Synthesis of Eu(TTA)3phen•H2O-PVP Composite Film and Study of their Luminescence Properties

2009 ◽  
Vol 79-82 ◽  
pp. 687-690
Author(s):  
Qing Liu ◽  
Zhen Xing Yao ◽  
Xian Peng Zheng ◽  
Yan Ming Yang ◽  
Qin Wei ◽  
...  
Keyword(s):  
Rare Earth ◽  
Water Molecule ◽  
Composite Film ◽  
Film Formation ◽  
Rare Earth Ions ◽  
Polymer Materials ◽  
Luminous Intensity ◽  
Rare Earth Complexes ◽  
Quenching Effect ◽  
The Eu

We obtained the Eu(TTA)3phen•H2O-PVP composite film by rare earth complexes Eu(TTA)3 phen•H2O was doped intentionally in polyvinylpyrrolidone(PVP), and the factors of effect it’s luminous intensity were investigated. The results indicate that the luminous effect of sample was best when the water and the alcohol proportion is 1: 4 in the resolver, the aggregation-time reached 12 h and the doping concentration of europioun ion reached 0.6%. The infrared spectrum analyses of sample indicate that there is an interaction between Eu(TTA)3phen•H2O and PVP. In addition, the fluorescence spectra and ultraviolet spectrum analyses of sample indicate that polymer materials can not only fix rare earth ions to enhance its luminescence intensity, but also avoid the quenching effect to rare earth caused by water molecule, through the replacement of PVP ligand to water molecule in the complex. The luminous intensity of the rare earth complexes can be greatly enhanced, and the composite film contained high amount of rare earth complexes is obtained, which laid a foundations for further study the film formation properties of rare earth complexes luminous materials.

The Solubility of Gd2O3 in K Cl-GdCl3 Melts

2020 ◽  
Vol 989 ◽  
pp. 91-96
Author(s):  
Irina D. Zakir'yanova ◽  
Elena V. Nikolaeva ◽  
Iraida V. Korzun
Keyword(s):  
Differential Scanning Calorimetry ◽  
Rare Earth ◽  
Molten Salts ◽  
Gadolinium Oxide ◽  
Rare Earth Oxides ◽  
Cooling Curves ◽  
Scanning Calorimetry ◽  
Liquidus Temperatures

The differential scanning calorimetry and the method of cooling curves are used to obtain data on liquidus temperatures of oxide-chloride systems Gd2O3 – K Cl - GdCl3. The solubility of gadolinium oxide in K Cl - GdCl3 melts has been studied. This information can be used for a developing process of the reduction of solid rare-earth oxides into their metals in molten salts.

Study on Preparation of RGB Tricolor Up-Conversion Fluorescent Powder

2014 ◽  
Vol 1015 ◽  
pp. 566-569
Author(s):  
Chun Hui Niu ◽  
Yong Lv ◽  
Xiao Ying Li ◽  
Qing Shan Chen
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
Photon Absorption ◽  
Green Luminescence ◽  
Solid State Method ◽  
Two Photon Absorption ◽  
Co Doping ◽  
Two Photon ◽  
Luminescence Process ◽  
Rare Earth Doped

For producing RGB tricolor luminescence, three kinds of components of rare-earth ions is chosen, which are Er3+doping, Er3+-Yb3+co-doping and Tm3+-Yb3+co-doping, respectively. Three kinds of rare-earth doped up-conversion fluoride material are prepared based on high temperature solid-state method. Under being excited by 980nm laser, three materials emit red, green and blue light, whose peak wavelengths are 660nm, 550nm and 480nm, respectively. Through analysis of luminescence process, it can be concluded that red and green luminescence are belong to two-photon absorption transversion, and blue luminescence is three-photon absorption transversion.

Preparation and tunable luminescence of CaCO3:Eu3+,Dy3+ phosphors

2014 ◽  
Vol 07 (04) ◽  
pp. 1450038 ◽  
Author(s):  
Yanwei Dong ◽  
Ming Kang ◽  
Ping Zhang ◽  
Qijun Cheng ◽  
Jie Wang
Keyword(s):  
Rare Earth ◽  
Uv Light ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
Precipitation Method ◽  
Scanning Calorimetry ◽  
Chromaticity Coordinates ◽  
Co Precipitation ◽  
Co Doped ◽  
The Rare Earth

Phosphors based on calcium carbonate, co-doped with various Eu 3+ and Dy 3+ concentrations were prepared by microwave co-precipitation method. The prepared phosphors were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry and differential scanning calorimetry (TG-DSC) and photoluminescence and photoluminescence excitation (PL-PLE) spectroscopy. Results showed that Dy 3+ and Eu 3+ ions were uniformly introduced into the host lattice of CaCO 3 taking the place of Ca 2+ ions. Under the excitation at 382 nm, the emission peak wavelengths were at 487 nm (4 F 9/2 → 6 H 15/2 of Dy 3+), 576 nm (4 F 9/2 → 6 H 13/2 of Dy 3+), and 614 nm (5 D 0 → 7 F 2 of Eu 3+). The luminescent intensities and emitting colors of Eu 3+- Dy 3+ co-doped CaCO 3 phosphors could be controlled by UV–violet excitations wavelengths or the rare-earth ions concentrations of Eu 3+ and Dy 3+ in phosphors. The chromaticity coordinates and photographs of samples under UV light showed the changes of the luminescence color intuitively through the varing UV–violet excitations wavelengths or the rare-earth ions concentrations of Eu 3+ and Dy 3+.

Significant Undercooled Liquid Region of Over 200K in Rare Earth Based Metallic Glasses

1998 ◽  
Vol 554 ◽  
Author(s):  
Z. P. Lu ◽  
Y. Li ◽  
S. C. Ng ◽  
Y. P. Feng
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Rare Earth ◽  
Metallic Glasses ◽  
Liquid Region ◽  
Undercooled Liquid ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Higher Temperature ◽  
Conventional Dsc

AbstractUsing a newly developed temperature modulated differential scanning calorimetry (TMDSC), glass transition has been detected in several RE-Fe-Al (RE = ND, Pr, Sm and Y) metallic glasses, which can not be observed by a conventional DSC. Our results show that the glass transition occurred together with a small fraction crystallization in the as-spun samples, the final main crystallization transition occurred at higher temperature (over 720K) in these rare-earth based alloys. Large undercooled liquid regions up to 200K at a underlying heating rate of 5K/min have been observed in these glasses.

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