rare earth excitation

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Near infrared excitation and emission in rare earth MOFs ...

Near infrared excitation and emission in rare earth MOFs via encapsulation of organic dyes ... An isoreticular series of anionic rare earth MOFs with fcu topology was synthesized using 10 different rare earth elements (Y 3+, Eu 3+, Gd 3+, Tb 3+, Dy 3+, Ho 3+, Er 3+, Tm 3+, Yb 3+, Lu 3+) and common linear ditopic ligands.

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Excitation and Recombination Processes in rare Earth Doped ...

Rare Earth (RE) doped II–VI semiconductors are currently used for production of thin film light emitting electroluminescence devices. The excitation and recombination processes in RE activated wide band gap II–VI semiconductors (ZnS, ZnSe, SrS and CaS) are reviewed.

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Energy Migration Engineering of Bright Rare‐Earth ...

Sep 22, 2015· Energy Migration Engineering of Bright Rare‐Earth Upconversion Nanoparticles for Excitation by Light‐Emitting Diodes. Yeteng Zhong. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and …

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Ultraviolet absorption and excitation spectroscopy of rare ...

/ Ultraviolet absorption and excitation spectroscopy of rareearthdoped glass fibers derived from glassy and crystalline preforms. Fiber Lasers IX: Technology, Systems, and Applications. Vol. 8237 2012.

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RareEarth Free SelfActivated Graphene Quantum Dots and ...

Rareearth (RE) based phosphors are attractive due to their potential applications. However, owing to the resource issue, these kinds of phosphors are expensive and costly. On the contrary, as for ...

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Mesoporous Silica Encapsulating Upconversion Luminescence ...

Mesoporous silica encapsulating upconversion luminescence NaYF4 nanorods with uniform core−shell structures have been successfully synthesized by the surfactantassistant sol−gel process. The thickness of ordered mesoporous silica shells can be adjusted from 50 to 95 nm by varying the amount of hydrolyzed silicate oligomer precursors from tetraethyl orthosilicate (TEOS), which further ...

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COULOMB EXCITATION IN ODDA RAREEARTH NUCLEI by …

the process of E2 Coulomb excitation with heavy ions, in order to ascertain the presence or absence of the specific anticipated perturbations of the rotational motion among the oddA rare earth nuclei, and to identify and study experimentally such other features, especially the vibrational states, as …

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Rare Earth pcu Metal–Organic Framework Platform Based on ...

Rare Earth pcu Metal–Organic Framework Platform Based on RE 4 (μ 3OH) 4 (COO) 6 2+ Clusters: Rational Design, Directed Synthesis, and Deliberate Tuning of Excitation Wavelengths. TianYi Luo † Chong Liu † Svetlana V. Eliseeva ‡ Patrick F. Muldoon † Stéphane Petoud * † ‡ Nathaniel L. Rosi * †

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Phosphor Wikipedia

The development of color TV took a long time due to the search for a red phosphor. The first red emitting rareearth phosphor, YVO 4:Eu 3+, was introduced by Levine and Palilla as a primary color in television in 1964. In single crystal form, it was used as an excellent polarizer and laser material.

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Excitation an overview | ScienceDirect Topics

This excitation is seen clearly 25) in small angle α scattering in the angular region of ∼4° (fig. 5). The mass systematics of this excitation indicates a deformation dependence of excitation energy and width in rare earth and actinide nuclei 25). The strength extracted is 40–70% of the EWSR limit.

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Electron Excitation Energies in the Rare Earth and ...

Calculations of various electronic excitation energies for the rare earth and actinide metals are discussed. Relativistic HartreeFock computations for atomic configurations most closely approximating those of the metal are initially performed, and crystal potentials are constructed by means of the renormalized atom method.

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A NonrareEarth Ions SelfActivated White Emitting ...

These whiteemitting materials are environment friendly, easy to synthesize, and costeffective. More importantly, this will potentially eliminate the challenge of rare earth resources. Furthermore, a single chip is used for excitation instead of a multichip, which can greatly reduce the cost of the devices.

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Rare earth magnets: not all new turbines are using them

Mar 06, 2012· Generators in many of the newest turbines have started using neodymium magnets. Nedodymium is a rare earth, produced in China. China's rare earths processing has had serious environmental concerns, as has Lynas Corporation's rare earths processing facility in Malaysia (which will be supplied by ore from the Mount Weld mine in Western Australia).

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Exploration and Mining of Rare Earth Elements (REE) Using ...

Exploration and Mining of Rare Earth Elements (REE) Using TubeBased Portable XRF Analyzers Subject Niton XRF analyzers are the ideal choice for measuring both light and heavy rare earth elements as well as providing reliable results for a comprehensive range …

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The excitation mechanism of rareearth ions in silicon ...

Rareearth excitation can quantitatively be described by an effective cross section σ eff taking into account all the intermediate steps leading to excitation. We have directly measured σ eff for Er in Si nc obtaining a value of ≈2×10 −17 cm 2.

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Energy Migration Engineering of Bright Rare‐Earth ...

©2015 WILEYVCH Verlag Co. KGaA, Weinheim 1 COMMUNICATION Energy Migration Engineering of Bright RareEarth Upconversion Nanoparticles for Excitation by Light

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Boosting the downshifting luminescence of rareearth ...

Sep 29, 2017· The resulting RENPs exhibit the brightest 1550 nm emission in aqueous solutions under 980 nm excitation among rareearth DC nanoparticles thus far. These bright RENPs enable noninvasive through ...

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Electronic excitation d rare earth impurities similar states (see, for example, [l, 811]). We shall dir cuss two simple cases: impact and Auger recombination excitations. Eleven felectrons of an Wf ion occupy the lowest states belonging to the ground 4115/2 multiplet, which is split into three quadruplet states and two doublet ones when the Est ion is a site of tetrahedral symmetry.

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Visible emission of rare earth doped ZrO 2 nanocrystalline ...

The photoluminescence and crystalline structure characterization of undoped and several samarium and erbium doped ZrO 2 samples are reported. Strong visible fluorescence emission produced by the transitions 4 G 5/2,7/2,9/2 of Sm 3+ was obtained by the excitation of the host at 320 nm (downconversion).

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ENERGIES OF RAREEARTH ION STATES RELATIVE TO HOST …

ENERGIES OF RAREEARTH ION STATES RELATIVE TO HOST BANDS IN OPTICAL MATERIALS FROM ELECTRON PHOTOEMISSION SPECTROSCOPY by Charles Warren Thiel A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Physics MONTANA STATE UNIVERSITY Bozeman, Montana December 2003

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1 Emission and Excitation Mechanisms of Phosphors

2 1 Emission and Excitation Mechanisms of Phosphors. ... This is especially true for many of the rareearth ions. Fig. Luminescent material containing activator ions A (ions showing thedesiredemission)andsensitizingionsS(onwhich,,UVexcitation can take place).

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The excitation mechanism of rareearth ions in silicon ...

Abstract A detailed investigation on the excitation mechanisms of rareearth (RE) ions introduced in Si nanocrystals (nc) is reported. Silicon nanocrystals were produced by highdose 80keV Si implantation in thermally grown SiO 2 followed by 1100 °C annealing for 1 h. Subsequently some of the samples were implanted by 300keV Er, Yb, Nd, or Tm at doses in the range 2×10 123×10 15 /cm 2.

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Kirby Mountain: Rare earths and wind turbines: Yes, it’s a ...

May 31, 2017· Rare earths and wind turbines: Yes, it’s a problem Despite wind industry lobbyists and apologists asserting otherwise, rare earth metals, particularly neodymium, are indeed extensively used in wind turbine magnets. ‘Permanent magnet machines feature higher efficiencies than machines with excitation windings (absence of field winding losses ...

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Excitation Path of Rare Earth Ions in Nitride Semiconductors

excitation the exact nature of the excitation path leading to the excitation of rareearth ions in GaN leads to think that Eu takes the substitutional site of the Gallium. The most commonly assumed mechanism involves Eudefect complexes where the defect captures an electronhole pair before Eu excitation.

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Maxwell Wallace | Shock Physics | Washington State University

Wallace, M., Diaz, , “Characterization of electronHole pair migration and trapping in rare earth doped YBO3 under vacuum ultraviolet excitation”, SID Digest of Technical Papers, 44, 1, 210213, 2013.

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Grafting organic antenna onto rare earth hydroxynitrate ...

Sep 30, 2019· Grafting organic antenna onto rare earth hydroxynitrate nanosheets for excitationdependent and greatly enhanced photoluminescence by multimodal energy transfer. Author links open overlay panel Qi Zhu a b c Juanjuan Liu a b Xiaodong Li a b Xudong Sun a b JiGuang Li c. Show more.

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Excitation and luminescence of rare earthdoped lead ...

Mar 16, 2014· The investigations into the excitation and luminescence properties of rare earth ions in glasses are essential to design optical devices such as solidstate lasers, color displays, upconverters and optical fiber amplifiers. In this work, the excitation and luminescence properties of Eu 3+, Tb 3+ and Er 3+ ions in lead phosphate glasses are ...

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Rare Earth (band) Wikipedia

Rare Earth is an American rock band affiliated with Motown's Rare Earth record label (named after the band), which prospered from 1970–1972. Although not the first white band signed to Motown, Rare Earth was the first big hitmaking act signed by Motown that consisted only of white members.

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Influence of multielectron excitation on EXAFS ...

Influence of multielectron excitation on EXAFS spectroscopy of trivalent rareearth ions and elucidation of change in hydration number through the series Atsuyuki Oht A,1,* hir O yuki kA gi,2 hir O shi tsun O,3 MA s A h A ru nOM ur A,4 A nd iw A O kA w A be 5 1Geological Survey of …

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Scintillation mechanisms of ceriumdoped rare earth ...

It was found that all three compounds have two types of excitation and emission spectra and decay constants, and they were attributed to two Ce3+ centers (Ce1 and Ce2) occupying two different host rare earth sites. The origins of two decay constants in the gammaray excited decay of Gd2(SiO4)O:Ce (GSO) were investigated.

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Journal of Spectroscopy Hindawi Publishing Corporation

To better understand and ascertain the mechanisms of flotation reagent interaction with rare earth (RE) minerals, it is necessary to determine the physical and chemical properties of the constituent components. Seven rare earth oxides (CeO2, Er2O3, Nd2O3, Tm2O3, Yb2O3, La2O3, and Tb4O7) that cover the rare earth elements (REEs) from light to heavy REEs have been investigated using Raman ...

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What’s So Rare About Rare Earth Elements?

In fact, the excitation efficiency of a 50kV tube in measuring rare earth elements versus xray tubes with a lower voltage have shown conclusively that the lower kV tubes are generally unsuitable for this application. 50 kV tube based analyzers can analyze light REEs including La, Ce, Pr and Nd.

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Photon upconversion Wikipedia

Photon upconversion (UC) is a process in which the sequential absorption of two or more photons leads to the emission of light at shorter wavelength than the excitation wavelength. It is an antiStokes type emission. An example is the conversion of infrared light to visible can take place in both organic and inorganic materials, through a number of different mechanisms.

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