Zn2−aGeO4:aRE and Zn2Ge1−aO4:aRE (RE = Ce3+, Eu3+, Tb3+, Dy3+): 4f–4f and 5d–4f transition luminescence of rare earth ions under different substitution

RSC Advances ◽  
2016 ◽  
Vol 6 (104) ◽  
pp. 102183-102192 ◽  
Author(s):  
Qiongyu Bai ◽  
Zhijun Wang ◽  
Panlai Li ◽  
Shuchao Xu ◽  
Ting Li ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Luminescent Properties ◽  
Rare Earth Ions ◽  
Different Characteristics

Generally, luminescent properties of rare earth ions doped host can be tuned by controlling the host composition, that is, when substituted for different cations of host, the rare earths ions can present different characteristics.

scholarly journals Structure, Luminescence, and Magnetic Properties of Crystalline Manganese Tungstate Doped with Rare Earth Ion

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3717
Author(s):  
Jae-Young Jung ◽  
Soung-Soo Yi ◽  
Dong-Hyun Hwang ◽  
Chang-Sik Son
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Sintering Temperature ◽  
Luminescent Properties ◽  
Concentration Quenching ◽  
Rare Earth Ions ◽  
Precipitation Method ◽  
Rare Earth Ion ◽  
Co Precipitation ◽  
Quenching Phenomenon

The precursor prepared by co-precipitation method was sintered at various temperatures to synthesize crystalline manganese tungstate (MnWO4). Sintered MnWO4 showed the best crystallinity at a sintering temperature of 800 °C. Rare earth ion (Dysprosium; Dy3+) was added when preparing the precursor to enhance the magnetic and luminescent properties of crystalline MnWO4 based on these sintering temperature conditions. As the amount of rare earth ions was changed, the magnetic and luminescent characteristics were enhanced; however, after 0.1 mol.%, the luminescent characteristics decreased due to the concentration quenching phenomenon. In addition, a composite was prepared by mixing MnWO4 powder, with enhanced magnetism and luminescence properties due to the addition of dysprosium, with epoxy. To one of the two prepared composites a magnetic field was applied to induce alignment of the MnWO4 particles. Aligned particles showed stronger luminescence than the composite sample prepared with unsorted particles. As a result of this, it was suggested that it can be used as phosphor and a photosensitizer by utilizing the magnetic and luminescent properties of the synthesized MnWO4 powder with the addition of rare earth ions.

Luminescent Properties of Rare Earth Ions in One-Dimensional Oxide Nanowires

2005 ◽  
Vol 5 (9) ◽  
pp. 1519-1531 ◽  
Author(s):  
Hongwei Song ◽  
Lixin Yu ◽  
LinMei Yang ◽  
Shaozhe Lu
Keyword(s):  
Rare Earth ◽  
Luminescent Properties ◽  
Rare Earth Ions ◽  
Oxide Nanowires ◽  
One Dimensional

Extraction Behavior of Rare Earths in Ion Liquid Extraction System Using 1-Butyl-3-Methyl-Imidazolium Hexafluorophosphate and Benzoyl Acetone

2011 ◽  
Vol 335-336 ◽  
pp. 1428-1432 ◽  
Author(s):  
Zhong Wei Pan ◽  
Chang Ma ◽  
Ying Wu Zhang ◽  
Yu Xia Huang ◽  
Xing Lin Chen ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Rare Earth ◽  
Rare Earths ◽  
Liquid Extraction ◽  
Rare Earth Ions ◽  
Extraction System ◽  
Tetraacetic Acid ◽  
Extraction Percentage ◽  
Extraction Solvent ◽  
Extraction Behavior

The extraction behavior of five rare earth ions (RE3+) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl-imidazolium hexafluorophosphate ionic liquid ([Bmim]PF6) as extraction solvent and benzoyl acetone (HA) as extractant. The extraction percentage of RE3+ using [Bmim]PF6 was less than 8% without HA. When sufficient HA was included in IL phase, the extraction percentage of RE3+ could be higher than 98%. The extracted species in the RE3+-[Bmim]PF6-HA system was neutral REA3 and the recovery of RE3+ extracted into [Bmim]PF6 can be achieved using the mixture of hydrazine hydrate and ethylenediamine tetraacetic acid (EDTA) as stripping agent. [Bmim]PF6 can be recycled in the experiment.

Synthesis, Morphology Control and Luminescent Properties of Rare Earth Ion-Doped CaWO4 Microstructures

2016 ◽  
Vol 16 (4) ◽  
pp. 4029-4034 ◽  
Author(s):  
Chunxia Liu ◽  
Lixia Yang ◽  
Dan Yue ◽  
Mengnan Wang ◽  
Lin Jin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Uv Light ◽  
Luminescent Properties ◽  
Average Diameter ◽  
Rare Earth Ions ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
Rare Earth Ion ◽  
X Ray ◽  
Facile Hydrothermal Route

Rare earth ions (Tb3+, Eu3+) doped CaWO4 microstructures were synthesized by a facile hydrothermal route without using any templates and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectrum. The results indicate that the asprepared samples are well crystallized with scheelite structure of CaWO4, and the average diameter of the microstructures is 2∼4 μm. The morphology of CaWO4:Eu3+ microstructures can be controllably changed from microspheres to microflowers through altering the doping concentration of Eu3+ from 3% to 35%, and the microflowers are constructed by a number of CaWO4:Eu3+ nanoflakes. Under the excitation of UV light, the emission spectrum of CaWO4:Eu3+ is composed of the characteristics emission of Eu3+ 5D0-7FJ (J = 1, 2, 3, 4) transitions, and that of CaWO4:Tb3+ is composed of Tb3+ 5D4-7FJ (J = 6, 5, 4, 3) transitions. Both of the optimal doping concentrations of Tb3+ and Eu3+ in CaWO4 microstructures are about 5%.

The optical spectrum of UVLED excitation using NTC nanometer particles to replace rare earth doping

MRS Advances ◽  
2019 ◽  
Vol 4 (33-34) ◽  
pp. 1895-1904
Author(s):  
Lihong Su ◽  
Kan Chen ◽  
Yongqiang Liu ◽  
ZiAo Zou ◽  
Lihua Su
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Optical Spectrum ◽  
Low Cost ◽  
Rare Earth Ions ◽  
Rare Earth Doping ◽  
Phosphor Material ◽  
Light Emitting ◽  
Luminescence Efficiency ◽  
Nickel Copper

Abstract:Ultraviolet light-emitting diodes (UVLEDs) with phosphor materials have considerable advantages over traditional illumination devices. Doping with rare earth ions can modify the optical spectrum of phosphor materials, but rare earths are very expensive. Thus, replacing rare earths with a common material would provide a great potential for the wide application in the future. In this study, we discovered that a novel type of semiconductor nanometre powder, namely manganese cobalt nickel copper oxide (MCNC), is able to emit blue-green wavelength spectrum when exited by 365-400nmUVLED. In addition, MCNC shows less attenuation of luminescence efficiency than other UVLED phosphor materials doped with rare earths with temperature increase. It is thus concluded that MCNC is a promising low-cost material to replace rare earths to adjust the optical spectrum wavelength of UVLED. This is the first time that nano-scale MCNC is reported to possess the property to change the optical spectrum wavelength of UVLED. This provides a new mechanical and nanometer phosphor material without rare earth doping to shift the wavelength spectrum.

scholarly journals Promoting luminescence of Yb/Er codoped ferroelectric composite by polarization engineering for optoelectronic applications

Nanophotonics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 2215-2223 ◽  
Author(s):  
Er Pan ◽  
Gongxun Bai ◽  
Yutao Peng ◽  
Liang Chen ◽  
Shiqing Xu
Keyword(s):  
Rare Earth ◽  
Electric Field ◽  
Electrical Resistance ◽  
Near Infrared ◽  
Optoelectronic Devices ◽  
Glass Ceramics ◽  
Luminescent Properties ◽  
Rare Earth Ions ◽  
Luminescent Materials ◽  
Crystal Structural

AbstractFerroelectric oxide nanocrystals, in combination with the robust coupling of an electric field with crystal structure symmetry, makes such systems agreeable to field-induced crystal structural transformation. The luminescent properties of rare earth ions are sensitive to the symmetry of the surrounding crystal field. The luminescence tuning of rare earth ions is an important assignment in the research of luminescent materials. However, the current conditional feasibility and reversibility in the exploration of luminescence modification remain major challenges. In this article, the luminescence modulation of rare earth ions has been developed in Yb3+/Er3+ codoped ferroelectrics glass ceramics containing Bi4Ti3O12 nanocrystals through an electric field. The inclusion of nanocrystals in the glass matrix greatly enhances the electrical resistance. Both upconversion and near-infrared emissions of rare earth ions are effectively enhanced more than twice via polarization engineering. The electric field regulates the photonic properties of rare earth ions with excellent reversibility and nonvolatility in ferroelectrics. The effective modification by electric field provides a new scheme for optical storage and optoelectronic devices.

scholarly journals Separation of rare-earth ions from ethylene glycol (+LiCl) solutions by non-aqueous solvent extraction with Cyanex 923

RSC Advances ◽  
2017 ◽  
Vol 7 (72) ◽  
pp. 45351-45362 ◽  
Author(s):  
Nagaphani Kumar Batchu ◽  
Tom Vander Hoogerstraete ◽  
Dipanjan Banerjee ◽  
Koen Binnemans
Keyword(s):  
Rare Earth ◽  
Solvent Extraction ◽  
Ethylene Glycol ◽  
Rare Earths ◽  
Rare Earth Ions ◽  
Aqueous Solvent ◽  
Cyanex 923

Mixtures of rare earths are separation by non-aqueous solvent extraction with two immiscible organic phases.

scholarly journals Adsorption performance of functionalized chitosan–silica hybrid materials toward rare earths

2014 ◽  
Vol 2 (45) ◽  
pp. 19415-19426 ◽  
Author(s):  
Joris Roosen ◽  
Jeroen Spooren ◽  
Koen Binnemans
Keyword(s):  
Rare Earth ◽  
Hybrid Materials ◽  
Rare Earths ◽  
Rare Earth Ions ◽  
Adsorption Performance ◽  
Separation Of Mixtures ◽  
Silica Hybrid

Functionalized chitosan–silica hybrid materials were synthesized, characterized and used for adsorption of rare-earth ions. These adsorbents can be used for the separation of mixtures of rare-earths.

Luminescent Properties of Rare Earth Doped AlF3-Based Glasses

1991 ◽  
Vol 244 ◽  
Author(s):  
L. R. Copeland ◽  
W. A. Reed ◽  
M. R. Shahriari ◽  
T. Iqbal ◽  
P. Hajcak ◽  
...  
Keyword(s):  
Rare Earth ◽  
Optical Fibers ◽  
Luminescent Properties ◽  
Rare Earth Ions ◽  
Ion Concentration ◽  
Fluoride Glass ◽  
Oxide Glasses ◽  
Low Loss ◽  
Rare Earth Ion ◽  
Rare Earth Doped

ABSTRACTRare earth ions can easily be incorporated into fluoride glasses in moderate to large concentrations and, due to their low phonon energy, these glasses appear to have many advantages over oxide glasses as hosts for rare earth ions used in optical amplifiers and lasers. We have therefore investigated the optical properties of Pr3+, Pr3+/Yb3+ and Pr3+/Yb3+/Lu3+ doped bulk AIF3-based glass samples as a function of rare earth ion concentration. We find that the addition of 2 wt% of Yb increases the fluorescence of Pr3+ at 1.32 μm by a factor of 35 when excited with 488 nm radiation. The fluorescence intensity and excited state lifetimes are found to be comparable to those measured for Pr in a ZBLAN host. Since it has also been demonstrated that optical fibers drawn from AIF3-based glasses exhibit relatively low loss (< 0.05 dB/m) and posses superior chemical durability compared to other fluotide glasses, it is possible that AIF3 glasses may become the fluoride glass of choice for practical fiber laser and amplifier applications.

scholarly journals Kinetics of luminescence calcium gallate activated by Yb3+, Er3+ ions

2020 ◽  
Vol 23 (3) ◽  
pp. 213-221
Author(s):  
A. P. Mar`in ◽  
U. A. Mar`ina ◽  
V. A. Vorob`ev ◽  
R. V. Pigulev
Keyword(s):  
Rare Earth ◽  
Luminescence Intensity ◽  
Luminescent Properties ◽  
Rare Earth Ions ◽  
Luminescence Spectra ◽  
Excitation Spectra ◽  
Semiconductor Laser Diode ◽  
Intracenter Luminescence ◽  
Trivalent Rare Earth ◽  
Kinetics Of

The paper presents the results of a study of the luminescent properties of calcium gallate activated by trivalent rare earth ions Yb3+ and Er3+. IR luminescence spectra of samples with a single activator Ca1‑хYbxGa2O4,Ca1‑хErxGa2O4 were studied when excited by radiation sources with a wavelength of 940 and 790 nm, respectively. The dependence of the luminescence intensity of samples on the concentration of rare earth ions is obtained. When the two-activator composition of Ca1‑х‑yYbxEryGa2O4 is excited by a semiconductor laser diode with a wavelength of 940 nm, IR luminescence is registered in the regions of 980-1100 nm and 1450-1670 nm. The radiation in these bands corresponds to electronic transitions in Yb3+ and Er3+ ions, respectively. For a luminescence band with a maximum at a wavelength of 1540 nm, the excitation spectra were measured, the maximum intensity is at the wavelengths: 930, 941, 970, 980 nm. The dependence of the IR luminescence intensity of a solid solution of Ca1‑х‑yYbxEryGa2O4 on the concentration of Er3+ ions was studied. With an increase in the concentration of Er3+ ions in the luminescence spectra, there is a redistribution in the intensity of the bands belonging to Yb3+ and Er3+ ions, which indicates the presence of energy transfer processes between these ions. The kinetics of IR luminescence attenuation was studied for series with one and two activators: Ca1‑хYbxGa2O4,Ca1‑хErxGa2O4, Ca1‑х‑yYbxEryGa2O4. It is established that the luminescence attenuation occurs mainly according to the exponential law, which indicates the predominance of the intracenter luminescence mechanism in the studied structures. Based on the analysis of the excitation and luminescence spectra of experimental samples, conclusions are made about the interaction of Yb3+ and Er3+ activator ions in the crystal lattice of calcium gallate.

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