rare earth excitation

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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 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
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Fluorescence Properties of Rare
Glasses may be prepared by sol-gel processing over a wide range of compositions and thick multilayer deposits may be used as waveguides for integrated optics Doping these layers with rare-earth (RE) ions enables the fabrication of active devices for optical amplifiers the incorporation of these ions into nanocrystallites offers possibilities for increased dopant
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Rare Earth Magnets and magnet Application
To understand rare earth magnets completely it is important to know what they are made of and where they come from In Rare earth class of periodic table 15 elements are called lanthanides and rest of the two are Scandium and Yttrium Rare earth magnets are considered second generation magnets with its derviates expanding to 4th Generation
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Measuring and analyzing excitation
Among these systems inhomogeneously broadened absorption lines of rare-earth ions in transparent crystals offer the potential for unmatched information handling capacities due to the unique capability to address a very large number of spectrally distinct subsets of ions within the high-density environment
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Photoluminescence studies of rare earth (Er Eu Tm) in
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
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CN2720713Y
The utility model discloses a combined exciting rare-earth permanent magnet generator which comprises a stator and a rare-earth permanent magnet rotor The utility model is characterized in that: winding of the stator is composed of a main winding and a capacitance winding The main winding is composed of coils two ends of the main winding are used as voltage output ends
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Excitation and luminescence of rare earth
16-3-2014Here we present the excitation and luminescence spectra of selected rare earth ions in lead phosphate glasses The optically active rare earth ions were limited to Eu 3+ Tb 3+ and Er 3+ Trivalent europium and terbium ions in several glass matrices are known as two red and green primary color light sources respectively
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Near infrared excitation and emission in rare earth
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 deeper tissue penetration due to minimal or no overlap of their excitation window with tissue absorption 1–3 Trivalent
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Kirby Mountain: Rare earths and wind turbines: Yes it's a
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
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FLUORESCENT LIFETIME MEASUREMENTS OF RARE EARTH
FLUORESCENT LIFETIME MEASUREMENTS OF RARE EARTH ELEMENTS IN GALLIUM ARSENIDE I Introduction In recent years the study of rare-earth ions in semiconductors has been one of strong interest because of their potential applications in opto-electronics The
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RARE
25-4-2019A rare-earth complex polymer having those characteristics is useful for example as a security material which gives encrypted information to various materials such as plastic materials The rare-earth complex polymer of the present embodiment has excellent solubility and characteristics as a fluorophore
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The excitation mechanism of rare
1-7-1999A 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 SiO2 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
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Excitation and luminescence of rare earth
Here we present the excitation and luminescence spectra of selected rare earth ions in lead phosphate glasses The optically active rare earth ions were limited to Eu 3+ Tb 3+ and Er 3+ Trivalent europium and terbium ions in several glass matrices are known as two red and green primary color light sources respectively
Read more
RARE EARTH COMPLEX AND LIGHT EMITTING ELEMENT
27-2-2020The rare earth complex in an embodiment comprises a rare earth ion and a plurality of ligands coordinated with the rare earth ion The rare earth ion is an ion of rare earth element selected from the group consisting of for example europium (Eu) neodymium (Nd) ytterbium (Yb) and gadolinium (Gd)
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Spectroscopic identification of rare earth elements in
In this work rare earth-doped phosphate glasses were synthesized and characterized using three different spectroscopic techniques The absorption spectra of the prepared praseodymium (Pr) and samarium (Sm) doped glasses recorded by a UV-VIS-NIR spectrophotometer show the characteristic absorption bands of these elements
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Theoretical Spectroscopy of Rare
An investigation of spectra radiative and autoionization characteristics for the rare-earth elements is of a great interest as for development atomic spectroscopy as different applications in plasma chemistry astrophysics laser physics quantum electronics etc We present and review the results of studying spectra and autoionization resonance characteristics of a few
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The excitation mechanisms of rare earth emissions in the
Rare earth excitation mechanisms 89 on the emissions was assessed by diffusing of the order of 100 ppm of silver or copper into the crystals There was no significant effect at this impurity level but an increase to 1000 ppm did give a small reduction of both emissions
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Newly Published Research: Analysis of Rare Earth
The other established handheld analysis technique is portable X-ray fluorescence (pXRF) However rare earth elements are a particular challenge for pXRF The K-shell emission lines for the rare earth elements range from low 40 keV to low 50 keV meaning the excitation energies for these elements must be more than 60 keV preferably
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Recent Progress of Rare‐Earth Doped Upconversion
In a typical hydrothermal process rare‐earth species such as rare‐earth chloride nitrate and acetate are used as RE source Various fluorides such as HF NH 4 F NaF NH 4 HF 2 NaBF 4 and HF are employed as fluoride precursor to synthesize
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The excitation mechanism of rare
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
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Using Rare Earth Oxides to Make Fluorescent Glasses
Image Credit: Mo-Sci A set of 17 chemical elements the rare earth elements (REE) consist of the fifteen lanthanides scandium and yttrium Compounds known as rare earth oxides (REO) are readily formed from rare earth elements as they are typically very reactive with oxygen in the ambient atmosphere
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Near infrared excitation and emission in rare earth MOFs
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 Five different cationic dye molecules were incorporated into the MOFs via ion exchange
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