Novel Terbium-Cerium Coordination Polymer: Synthesis, Characterization and Fluorescence Properties

2011 ◽  
Vol 284-286 ◽  
pp. 2198-2201 ◽  
Author(s):  
Dan Liu ◽  
Zhong Gang Wang ◽  
Da Peng Zhou ◽  
Dian Wu Huang ◽  
Hong Mei Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Coordination Polymer ◽  
Polymer Matrix ◽  
Rare Earth Ions ◽  
Carboxyl Groups ◽  
Fluorescence Measurement ◽  
Green Color ◽  
Characteristic Emission ◽  
Central Coordination ◽  
Polymer Ligand

Using a polyaryletherketone bearing carboxyl groups (PEK) as macromolecular ligand, Tb3+and Ce3+as central coordination ions, 1,10-phenanthroline (Phen) as the second ligand, a kind of novel terbium-cerium coordination polymer (PEK-Tb3+0.5Ce3+0.5-Phen) was prepared. The structure of PEK-Tb3+0.5Ce3+0.5-Phen was investigated by ICP, FTIR and XRD. The results showed that Tb3+and Ce3+ions coordinated to both the polymer ligand PEK and the second ligand Phen, and rare earth ions homogeneously distributed in the polymer matrix. The fluorescence measurement indicated that PEK-Tb3+0.5Ce3+0.5-Phen can exhibit the characteristic emission of Tb3+. Furthermore, the emission intensity of PEK-Tb3+0.5Ce3+0.5-Phen at 546 nm, corresponding to the green color, was higher than that of PEK-Tb3+-Phen.

scholarly journals Photoluminescence and Cathodoluminescence of GaN doped with Pr

2000 ◽  
Vol 5 (S1) ◽  
pp. 817-823
Author(s):  
H. J. Lozykowski ◽  
W. M. Jadwisienczak ◽  
I. Brown
Keyword(s):  
Rare Earth ◽  
Thermal Annealing ◽  
Spectral Range ◽  
Atmospheric Pressure ◽  
Rare Earth Ions ◽  
Emission Lines ◽  
Decay Kinetics ◽  
Temperature Range ◽  
Characteristic Emission ◽  
Kinetics Measurement

In this paper we have reported the observation of visible photoluminescence (PL) and cathodoluminescence (CL) of Pr implanted in GaN. The implanted samples were given isochronal thermal annealing treatments at a temperature of 11000 C in NH3, N2, Ar2, and in forming gas N2 +H2, at atmospheric pressure to recover implantation damages and activate the rare earth ions. The sharp characteristic emission lines corresponding to Pr3+ intra-4fn-shell transitions are resolved in the spectral range from 350 nm to 1150 nm, and observed over the temperature range of 12 K-335 K. The PL and CL decay kinetics measurement was performed for 3P1, 3P0 and 1D2 levels.

Visible Luminescence of Rare Earth Ions Doped Amorphous Zinc Oxide Thin Films Grown by Sputtering Technique

2007 ◽  
Vol 1035 ◽  
Author(s):  
Wojciech M. Jadwisienczak ◽  
Ajay S. Vemuru ◽  
Saima Khan ◽  
Aurangzeb Khan ◽  
Marty E. Kordesch
Keyword(s):  
Rare Earth ◽  
Ambient Pressure ◽  
Optical Excitation ◽  
Rf Magnetron Sputtering ◽  
Rare Earth Ions ◽  
Zno Films ◽  
Visible Luminescence ◽  
Characteristic Emission ◽  
Thermal Annealing Process ◽  
Quartz Substrates

AbstractWe report on the luminescence of rare earth (RE) (Sm, Er, Tm) ions doped ZnO films grown by the rf-magnetron sputtering technique. Samples were insitu doped with Sm ion or with Sm, Er, and Tm ions simultaneously without any intentional co-dopants and deposited on c-Si or quartz substrates at low temperatures. Selected ZnO:RE samples were thermally annealed in 200ºC-1000ºC temperature range in oxygen or argon gas at ambient pressure. As-grown and annealed samples were amorphous (a-ZnO) as was confirmed by the X-ray analysis. Furthermore, a-ZnO:RE samples were investigated by energy diffraction, photoluminescence and cathodoluminescence. In general, CL spectra of as-grown RE-doped a-ZnO films show characteristic emission lines due to 4f-shell transitions of RE3+ ions. Optical excitation of as-grown a-ZnO doped with RE ions using above the bandgap excitation resulted in strong host emission overlapped with weak RE3+ emission bands. It was observed that a thermal annealing process promotes changes of RE ions' environments resulting in significant 4f-shell transition luminescence intensity quenching.

Synthesis and Fluorescence Property of Rare-Earth Terbium Active Monomer Complexes

2013 ◽  
Vol 328 ◽  
pp. 724-728 ◽  
Author(s):  
Dong Mei Wang ◽  
Wen Bo Cao ◽  
Jian Fan
Keyword(s):  
Rare Earth ◽  
Powder Diffraction ◽  
Polymer Matrix ◽  
Elemental Analysis ◽  
Rare Earth Ions ◽  
Rare Earth Complexes ◽  
Structure And Properties ◽  
Combinatorial Method ◽  
X Ray ◽  
Ft Ir

Tb-MA-Phen mononuclear rare earth complexes were prepared. The structure and properties of the complexes were characterized by elemental analysis, FT-IR and UV, TA, X-ray powder diffraction and SEM. Moreover, the rare earth ions were doped into the polymer matrix using the combinatorial method. High luminescence copolymer was synthesized by polymerizing α-methyl methyacrylate (MA) and Styrene (St) with terbium-methacrylate complex in solution with AIBN as initiator, respectively.

Coordination polymers built up from an s-tetrazine derived ligand and rare-earth ions: from a sequential dimensional expansion to organic–inorganic energy transfer

2018 ◽  
Vol 47 (31) ◽  
pp. 10715-10720 ◽  
Author(s):  
Paul Rouschmeyer ◽  
Nathalie Guillou ◽  
Christian Serre ◽  
Gilles Clavier ◽  
Clémence Allain ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Coordination Polymer ◽  
Coordination Polymers ◽  
Rare Earth Ions ◽  
Step Procedure

From 1D to 2D: the dimensionality of a coordination polymer based on a luminescent tetrazine and Tb3+ ions has been increased using a two step procedure.

Characterization of Rare-Earth Fluoride Anti-Stokes Phosphors by Scanning arid Transmission Electron Microscopy

1971 ◽  
Vol 29 ◽  
pp. 142-143
Author(s):  
N. M. P. Low ◽  
L. E. Brosselard
Keyword(s):  
Electron Microscopy ◽  
Rare Earth ◽  
Elevated Temperatures ◽  
Stoichiometric Composition ◽  
Rare Earth Ions ◽  
Crystalline Solid ◽  
Precipitation Process ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Rare Earth Fluorides

There has been considerable interest over the past several years in materials capable of converting infrared radiation to visible light by means of sequential excitation in two or more steps. Several rare-earth trifluorides (LaF3, YF3, GdF3, and LuF3) containing a small amount of other trivalent rare-earth ions (Yb3+ and Er3+, or Ho3+, or Tm3+) have been found to exhibit such phenomenon. The methods of preparation of these rare-earth fluorides in the crystalline solid form generally involve a co-precipitation process and a subsequent solid state reaction at elevated temperatures. This investigation was undertaken to examine the morphological features of both the precipitated and the thermally treated fluoride powders by both transmission and scanning electron microscopy.Rare-earth oxides of stoichiometric composition were dissolved in nitric acid and the mixed rare-earth fluoride was then coprecipitated out as fine granules by the addition of excess hydrofluoric acid. The precipitated rare-earth fluorides were washed with water, separated from the aqueous solution, and oven-dried.

Structural, Morphological and Magnetic Characterization of Sm-substituted Ni-Zn Ferrite

2020 ◽  
Vol 10 (2) ◽  
pp. 152-156 ◽  
Author(s):  
Muhammad Hanif bin Zahari ◽  
Beh Hoe Guan ◽  
Lee Kean Chuan ◽  
Afiq Azri bin Zainudin
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Saturation Magnetization ◽  
Sol Gel ◽  
Magnetic Behavior ◽  
Rare Earth Ions ◽  
Ion Concentration ◽  
Zn Ferrite ◽  
Auto Combustion ◽  
Combustion Technique

Background: Rare earth materials are known for its salient electrical insulation properties with high values of electrical resistivity. It is expected that the substitution of rare earth ions into spinel ferrites could significantly alter its magnetic properties. In this work, the effect of the addition of Samarium ions on the structural, morphological and magnetic properties of Ni0.5Zn0.5SmxFe2-xO4 (x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) synthesized using sol-gel auto combustion technique was investigated. Methods: A series of Samarium-substituted Ni-Zn ferrite nanoparticles (Ni0.5Zn0.5SmxFe2-xO4 where x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) were synthesized by sol-gel auto-combustion technique. Structural, morphological and magnetic properties of the samples were examined through X-Ray Diffraction (XRD), Field-Emission Scanning Electron Microscope (FESEM) and Vibrating Sample Magnetometer (VSM) measurements. Results: XRD patterns revealed single-phased samples with spinel cubic structure up to x= 0.04. The average crystallite size of the samples varied in the range of 41.8 – 85.6 nm. The prepared samples exhibited agglomerated particles with larger grain size observed in Sm-substituted Ni-Zn ferrite as compared to the unsubstituted sample. The prepared samples exhibited typical soft magnetic behavior as evidenced by the small coercivity field. The magnetic saturation, Ms values decreased as the Sm3+ concentration increases. Conclusion: The substituted Ni-Zn ferrites form agglomerated particles inching towards more uniform microstructure with each increase in Sm3+ substitution. The saturation magnetization of substituted samples decreases with the increase of samarium ion concentration. The decrease in saturation magnetization can be explained based on weak super exchange interaction between A and B sites. The difference in magnetic properties between the samples despite the slight difference in Sm3+ concentrations suggests that the properties of the NiZnFe2O4 can be ‘tuned’, depending on the present need, through the substitution of Fe3+ with rare earth ions.

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