A change of orbital state alters the coupling between ions and their surroundings drastically. Orbital excitations are hence key to understand and control …

In particular, broadband near-infrared luminescence (FWHM = 278 nm) associated to the 1G4 → 3H5 (Pr3+), 1D2 → 1G4 (Pr3+) and 4I13/2 → 4I15/2 (Er3+) transitions of rare earth ions in ...

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 …

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 ...

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].

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.

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 …

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 …

Energy Migration Engineering of Bright Rare-Earth Upconversion Nanoparticles for Excitation by Light-Emitting Diodes. Yeteng Zhong, Yeteng Zhong. CAS Key Laboratory for Biomedical …

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] .

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 …

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 …

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 …

Optically excited rare earth doped semiconductors suffer from the so-called concentration quenching effect, 1–4 i.e. the intensity of the rare earth luminescence decreases with increasing dopant concentration. This effect dominates if the excitation energy is transferred between many ions in the time necessary for the radiative decay …

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 …

An isoreticular series of anionic rare earth MOFs with fcu topology was synthesized using 10 different rare earth elements (Y3+, Eu3+, Gd3+, Tb3+, Dy3 Jump to main content . Jump to site search . Publishing. ... Near infrared excitation and emission in rare earth MOFs via encapsulation of organic dyes C. Liu, S. V. Eliseeva, T. Luo, ...

The mechanism of excitation energy migration in coordination sphere is a key problem of the modern spectroscopy and photochemistry. A great number of investigations are devoted to study of various factors which influence on intensification of f-f transitions in lanthanide ions and excitation energy degradation on rare-earth complexes.

Rare-earth-doped electrospun scheelite CaWO 4 nanofibers with excitation-dependent photoluminescence and high-linearity cathodoluminescence for ratiometric UV wavelength and radiation sensors. ... [15]. Theoretically, the broad emission band from the AWO 4 lattice overlaps the excitation bands of both Tb 3+ and Eu 3+ ions, which can …

Because the 4f levels of a rare-earth atom are localized and are not directly involved in bonding interactions, we also assume that the non-radiative excitation of electrons within these levels is ...

Rare earth emitters enable critical quantum resources including spin qubits, single photon sources, and quantum memories. ... Using this feature, storage, and retrieval of single ion excitation is ...

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 …

Novel self-activated rare-earth-free Ca 2 Sb 2 O 7 phosphor was synthesized by high-temperature solid-state reaction method. ... Ca 2 Sb 2 O 7 is a ternary antimonate with an intense blue emission under UV excitation. When rare-earth ions are doped in Ca 2 Sb 2 O 7 there exist the possibility of energy transfer from Ca 2 Sb 2 O 7 to rare-earth ...

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 …

Fluorescence quenching effects caused by multipolar energy‐transfer interactions between rare‐earth ions are examined. Transfer between remote ions by way of transitions that are matched in energy appears to be essentially dependent upon concentration alone (e.g., Sm 3+ self‐quenching) while transfer by non‐resonant mechanisms can show a strong …

This is especially the case for trivalent rare earth ions that can easily be reduced to the divalent state (redox-sensitive rare earth ions) like Sm 3+, Eu 3+, and Yb 3+, where light can be absorbed by an intense ligand-to-metal charge transfer state (LMCT state) from which the excitation energy can be transferred to the 4f levels of the rare ...

Lanthanide-doped inorganic upconversion nanoparticles (UCNPs) excitable with NIR light sources are regarded as promising alternatives with which to circumvent background fluorescence and stray...

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 …

Fluorescence bioimaging based on rare-earth-doped nanocrystals (RENCs) in the shortwave infrared (SWIR, 1000–3000 nm) region has aroused intense interest due to deeper penetration depth and clarity.

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 ...

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 …

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 ...

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.

An optical method for the sensitive detection of excited energy levels in rare-earth luminescent materials is developed based on the magnetic field induced photoluminescence (PL) enhancement phenomenon observed in Er 3+:YVO 4 crystals. Since the PL intensity of rare-earth luminescent materials is sensitive to the excitation …

Rare earth ions doped luminescent materials possess better characteristics in emission profile, fluorescence decay time, and photochemical stability, which …

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 …

The optical activity of rare-earth ions in semiconductors is discussed taking into account the large 4f-level correlation energy. In addition to crystal-field effects, three …

energy levels, which endow rare earth luminescent mate-rials with many fascinating optical properties over a broad spectral region ranging from the ultraviolet (UV) to the near …