(Invited) Excitation Mechanism of Rare Earth Ions in …
The excitation cross section of rare earth ions is orders of magnitude higher in silicon-rich amorphous alloys than in ordinary oxides. Energy transfer is often very …
(INVITED)A review on rare-earth activated SnO2-based …
In both cases, the emission of Tb 3+ and Ho 3+ was enhanced upon SnO 2 bandgap excitation in comparison with direct excitation at an excited electronic state of the rare-earth ions. In case of Tb 3+ doped SnO 2, the results are in agreement with the work of Zhang et al. on Tb 3+ doped SiO 2 –SnO 2 glass-ceramic films [ 122 ].
Red emitting non-rare earth doped LiMgBO
In order to overcome the challenges faced in developing cost-effective and efficient materials for lighting solutions, we report a new red-emitting Mn4+ doped LiMgBO 3 phosphor synthesized by solution combustion and solid-state routes. The phosphors had broad excitation bands in the UV (200–400 nm) and blue (400–560 nm) regions of the …
Rare Earth Luminescence: Electronic Spectroscopy …
The aim of this chapter is to present concise overview on the key concept of luminescence and electronic spectroscopy of rare earth compounds: energy transfer …
Luminescence excitation mechanisms of rare earth doped
The three peaks located at 255 (UV), 395 (near-UV) and 465 nm (blue) are the most intense and suitable for the excitation of the sample. The spectral profile of the emission spectra irradiated at 255, 395 and 465 nm are identical. The brightest emission is realized at 18 mol% doping of Eu ions at 255 and 465 nm excitations.
Luminescent Nanomaterials Doped with Rare Earth Ions and …
The group of rare-earth elements contains lanthanides, as well as elements such as scandium (Sc), yttrium (Y), and lanthanum (La). Lanthanides are characterized by the occurrence of a gradually filling 4f shell, which lies under the layer of outer 5s, 5p, and 6s shells. In the general form, the electronic configuration of lanthanides can be written …
Fluorescent strengthening effect of co-doped inert rare earth …
While, the co-doping of rare earth ions is applied widely in inorganic luminescence in order to improve the luminescent properties [28]. The combining of above two methods will offer a potential strategy for enhancing further the optical properties of organic complexes. ... Under the excitation of 275 nm, the emission spectra of Tb(btc) …
Rare-earth-doped electrospun scheelite CaWO4 nanofibers with excitation
Abstract. Scheelite structured AWO 4 compounds (A = Ba, Ca, Pb and Sr) are efficient hosts for rare-earth dopants. In this work, high-aspect-ratio AWO 4 (A = Ba, Ca, Pb and Sr) nanofibers, doped with 5 mol.% Tb and 5 mol.% Eu on A site, were synthesized using a sol-gel electrospinning technique, and their performances as a ratiometric sensor …
Sub-50-ns ultrafast upconversion luminescence of a rare-earth …
Rare-earth ions exhibit a rich ladder-like array of energy levels in their 4f electronic configurations, providing a significant probability for two or more low-energy photons to upconvert into ...
Luminescence thermometry with rare earth doped …
Rare earth doped materials have been widely used for luminescent thermometers due to their chemical stability and non-blinking properties. ... excitation or emission of luminescent thermometers in biological windows facilitates real-time temperature monitoring during photothermal therapy or temperature measurement at the …
Rare Earth Ion Doped Luminescent Materials: A Review of …
Layered hydroxides and rare earth ions are assembled layer by layer, and combined with pyromellitic acid, rare earth ion doped information encryption material is obtained. Under the excitation of ultraviolet and visible light, layered hydroxides doped with rare earth ions exhibit different color emissions, as shown in Figure 14 .
(PDF) Analysis of the electron excitation spectra in heavy rare earth …
The energy loss spectra of 75 keV electrons transmitted through thin evaporated foils of heavy rare earths (Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) in three different chemical states (metal, hydride and ...
Energy Migration Engineering of Bright …
Energy Migration Engineering of Bright Rare-Earth Upconversion Nanoparticles for Excitation by Light-Emitting Diodes. Yeteng Zhong, Yeteng Zhong. CAS Key Laboratory for Biomedical …
Paradigms and challenges for bioapplication of rare earth
Rare earth (RE) materials, which are excited in the ultraviolet and emit in the visible light spectrum, are widely used as phosphors for lamps and displays. ... After reviewing size control, we consider how diverse applications impose different requirements on excitation and/or emission photons and review recent developments on tuning of UC ...
Mesoporous Silica Encapsulating Upconversion Luminescence Rare-Earth
The secondary-excitation fluorescence of Rhodamine B is generated from the upconversion rare-earth fluoride nanorods cores to the fluorescent dyes loaded in the mesoporous silica shells. ... Intense red upconversion luminescence in Er3+-sensitized particles through confining the 1532 nm excitation energy. Journal of Luminescence …
Saturation effects in the excitation spectra of rare-earth …
On the line narrowing in two-photon excitation spectra of rare-earth ions To illustrate the line narrowing of two-photon (TP) excitation lines relative to their one-photon (OP) equivalents, Fig. 5 [22] compares the one- and two-photon 8S712 6j.7~~ high-resolution exci- tation spectra of the 6P712 8S emission of Gd3 + in GdB3O6 at RT. The …
Realization of non-rare earth doped blue-emitting phosphor …
Further, the price of rare earth is expensive and reserves are limited. As a non-rare earth element, the excitation spectrum of Sb 3+ is located in the UV region. Packaging LED with Sb 3+ doped phosphors can effectively avoid the problem of visible light reabsorption, thus improving the luminescence efficiency [26].
Acoustic control of optical excitation of rare-earth ions
Acoustic control of optical excitation of rare-earth ions. Ryuichi Ohta, Grégoire Lelu, Xuejun Xu, Tomohiro Inaba, Kenichi , Yoshitaka Taniyasu, Haruki Sanada, Atsushi Ishizawa, Takehiko Tawara, Katsuya Oguri, Hiroshi Yamaguchi, and Hajime Okamoto. Author Information. Find other works by these authors. CLEO: Science and Innovations …
Rare Earth Ion Doped Luminescent Materials: A …
Rare earth ions doped luminescent materials possess better characteristics in emission profile, fluorescence decay time, and photochemical stability, which …
Luminescence excitation mechanisms of rare earth doped …
This excitation mechanism is called excitation by electron impact and it becomes noticeable for rare earth concentrations higher than 1%. The excitation spectra of the luminescence of CeF 3 ( Fig. 8 ) show clearly the electron impact excitations as well as the exciton energy transfer evocated in the preceding section [26] .
Time-resolved and excitation-emission matrix
Among the various rare-earth ions, europium (Eu 3+)(4f 6) ion exhibits a narrow and almost monochromatic electric dipole emission transition, 5 D 0 → 7 F 2 …
Experimental studies on drive performances of less rare-earth …
This paper presents feasibility studies on hybrid excitation motor (HEM) as a candidate of less rare earth permanent magnet and high power density machine for hybrid electric vehicle drives. The construction, the basic working principle focusing on variable field control capability and the design concept of HEM are overviewed. After making the …
Excitation and luminescence of rare earth-doped lead …
The relative distribution of rare-earth ions R3+ (Dy3+ or Ho3+) in the phosphate glass RAl0.30P3.05O9.62 was measured by employing the method of isomorphic substitution in neutron diffraction and ...
Double-Emission Ratiometric Fluorescent Sensors Composed of Rare-Earth
Quantum dots (QDs) are a class of zero-dimensional nanocrystal materials, whose lengths are limited to 2–10 nm. Their unique advantages such as wide excitation spectra, narrow emission spectra, and high quantum yield make their application possible in fluorescence sensing, wherein QDs such as CdSe, CdTe, and CdS are used. Indeed, QDs have a …
Energy Migration Engineering of Bright Rare‐Earth …
Graphical Abstract. A novel Nd3+-sensitized upconversion nanoparticle (UCNP) that can be excited by near-infrared 740 nm light-emitting diode (LED) lamps with bright upconversion luminescence is …
Covalent organic frameworks decorated by rare earth ions
The excitation spectrum of TGH + ⋅PD:Eu ... Rare earth ions and their composites have been widely studied, so it is necessary to investigate the reported rare earth composites, and then select the appropriate rare earth ions to combine with COFs according to the actual needs. Third, the combined use of multiple metal ions, including …
Energy-Saving Design and Research of High-Speed …
In recent years, under the background of low carbonization and industrial intelligence, with the rise of new energy sources such as wind energy and solar energy, rare earth permanent magnets have begun to be widely used in generators of these new energy sources. From the perspective of green and sustainable development, permanent …
Analysis of the electron excitation spectra in heavy rare earth …
2014 The energy loss spectra of 75 keV electrons transmitted through thin evaporated foils of heavy rare earths (Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) in three different chemical states (metal, hydride and oxide) exhibit two main peaks due to collective « plasmon » excitations in the 10-17 eV energy range and to inner 5p excitations between 30 and 40 eV. A …
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1. Introduction. Rare-earth doped ceramics and glasses have been known as fluorescent materials for lasers [1] and optical amplifiers [2].Also, infrared-to-visible upconversion (UC) [3], [4], [5] to emit visible light with near-infrared (NIR) excitation is a characteristic phenomenon reported mostly for them. As for biological use, by making the …
Grafting organic antenna onto rare earth hydroxynitrate …
1. Introduction. Usually, f-f electronic transitions of the trivalent rare earth ions (RE 3+) are forbidden by the spin selection rules, so direct excitation of RE 3+ ions upon light irradiation is a relatively inefficient process [1].In view of this, doping RE 3+ ions into host lattices with a low concentration to yield hybrid materials is widely applied to …
