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.
ENERGIES OF RARE-EARTH 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
Rare-earth (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 ...
Exploration and Mining of Rare Earth Elements (REE) Using Tube-Based 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 …
excitation the exact nature of the excitation path leading to the excitation of rare-earth ions in GaN leads to think that Eu takes the substitutional site of the Gallium. The most commonly assumed mechanism involves Eu-defect complexes where the defect captures an electron-hole pair before Eu excitation.
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).
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 anti-Stokes type emission. An example is the conversion of infrared light to visible light.Upconversion can take place in both organic and inorganic materials, through a number of different mechanisms.
These white-emitting materials are environment friendly, easy to synthesize, and cost-effective. 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.
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.
Sep 30, 2019· Grafting organic antenna onto rare earth hydroxynitrate nanosheets for excitation-dependent and greatly enhanced photoluminescence by multi-modal energy transfer. Author links open overlay panel Qi Zhu a b c Juanjuan Liu a b Xiaodong Li a b Xudong Sun a b Ji-Guang Li c. Show more.
Abstract A detailed investigation on the excitation mechanisms of rare-earth (RE) ions introduced in Si nanocrystals (nc) is reported. Silicon nanocrystals were produced by high-dose 80-keV Si implantation in thermally grown SiO 2 followed by 1100 °C annealing for 1 h. Subsequently some of the samples were implanted by 300-keV Er, Yb, Nd, or Tm at doses in the range 2×10 12-3×10 15 /cm 2.
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 ...
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 Technology of China, Beijing, 100190 China.
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 odd-A rare- earth nuclei, and to identify and study experimentally such other features, especially the vibrational states, as …
Mesoporous silica encapsulating upconversion luminescence NaYF4 nanorods with uniform core−shell structures have been successfully synthesized by the surfactant-assistant 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 ...
Rare-earth 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.
/ Ultraviolet absorption and excitation spectroscopy of rare-earth-doped glass fibers derived from glassy and crystalline preforms. Fiber Lasers IX: Technology, Systems, and Applications. Vol. 8237 2012.
©2015 WILEY-VCH Verlag & Co. KGaA, Weinheim wileyonlinelibrary.com 1 COMMUNICATION Energy Migration Engineering of Bright Rare-Earth Upconversion Nanoparticles for Excitation by Light-
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 hit-making act signed by Motown that consisted only of white members.
Calculations of various electronic excitation energies for the rare earth and actinide metals are discussed. Relativistic Hartree-Fock 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.
Influence of multi-electron excitation on EXAFS spectroscopy of trivalent rare-earth 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 …
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.
Photoluminescence studies of rare earth (Er, Eu, Tm) in situ doped GaN ... band-gap excitation the Er3+ PL emission reached its max-imum under slightly N-rich growth conditions. On the con-trary, the band-edge emission from the GaN host reached its maximum …
Rare Earth pcu Metal–Organic Framework Platform Based on RE 4 (μ 3-OH) 4 (COO) 6 2+ Clusters: Rational Design, Directed Synthesis, and Deliberate Tuning of Excitation Wavelengths. Tian-Yi Luo † Chong Liu † Svetlana V. Eliseeva ‡ Patrick F. Muldoon † Stéphane Petoud * † ‡ Nathaniel L. Rosi * †
Wallace, M., Diaz, A.L., “Characterization of electron-Hole pair migration and trapping in rare earth doped YBO3 under vacuum ultraviolet excitation”, SID Digest of Technical Papers, 44, 1, 210-213, 2013.
Electronic excitation d rare earth impurities similar states (see, for example, [l, 8-11]). 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.
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 solid-state lasers, color displays, up-converters 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 ...
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 ...
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 …
In this context, it is worth mentioning that the main purpose of this chapter is to show some of concrete concept of noble metallic nanoparticle interaction with rare-earth ions exhibiting a field enhancement in transparent medium with noble metal NPs embedded via a localized surface plasmon resonance.
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 gamma-ray excited decay of Gd2(SiO4)O:Ce (GSO) were investigated.
The development of color TV took a long time due to the search for a red phosphor. The first red emitting rare-earth 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.
Excitation and luminescence properties of Eu3+, Tb3+ and Er3+ ions in lead phosphate glasses have been studied. From excitation spectra of Eu3+ ions, the electron–phonon coupling strength and phonon energy of the glass host were calculated and compared to that obtained by Raman spectroscopy.
