rare earth doped
We systematically investigated photoluminescence (PL), scintillation and dosimeter properties of rare-earth (RE) doped NaPO 3-Al(PO 3) 3 (NAP) glasses. The NAP glasses doped with a series of RE ions (La-Yb, except Pm) with a consistent concentration (0.3 wt%) were prepared by the conventional melt-quenching method.
All rare-earth-doped gain media have in common that the pump and laser transitions are so-called weakly allowed transitions with fairly small oscillator strength. A consequence of this is that the upper-state lifetimes can be long, i.e. of the order of microseconds to milliseconds, so that substantial amounts of energy can be stored in such media. This property makes rare-earth-doped lasers ...
The second approach to fabricate rare-earth doped polymer waveguides is obtained by combining the excellent properties of SiO2 as a host for rare-earth ions with the easy processing of polymers.
Rare-Earth (RE) doped materials are relevant components of physical, chemical, and biomedical systems. They are currently exploited in a number of devices including solid-state lasers, phosphors, displays, telecom systems, sensors and quantum memories.
Rare-earth doped fibers are doped with ions of rare-earth elements to achieve high absorption and low loss in the visible and IR regions. They are typically used for amplification in fiber lasers or optical amplifiers. We offer fiber doped with Erbium, Ytteerbium, and Neodymium to …
Optical Amplifiers from Rare-Earth Co-Doped Glass Waveguides 283 McCumber (McCumber, 1964) is a powerful tool that permits one of these two cross sections to be calculated if the other is known from measurements. The radiative transition probability between the states J and J is given by 2 2 43 3 64 2 (,'') 3(2 1) 9 ed md A J J S S hJ SXKK K
Er3+ doped heavy metal fluoride glasses are studied by use of the upconversion process because they can efficiently convert 800 nm light from a diode laser into visible light. The dynamics of the upconversion processes and the efficiencies of these processes vary with composition and preparation route of the heavy metal fluoride glasses. The dynamics of the upconversion processes in these ...
In contrast, rare-earth (RE) doped nanoparticles are of interest for in vivo imaging due to various advantages such as low cytotoxicity, high quantum yield, longer lifetime, narrow emission lines, large Stokes shifts, photo-stability and high chemical stability [13, 14]. Therefore, RE-doped luminescent nanoparticles have great potential as a ...
Physical and electrical properties enhancement of rare-earth doped-potassium sodium niobate (KNN): a review Ceramics – Silikáty 59 (2) 158-163 (2015) 159 best to our knowledge little study has been done on doping rare earths in KNN (Figure 1). Therefore, this …
Rare Earth and Transition Metal Doping of Semiconductor Material explores traditional semiconductor devices that are based on control of the electron's electric charge.. This book looks at the semiconductor materials used for spintronics applications, in particular focusing on wide band-gap semiconductors doped with transition metals and rare earths.
By doping the rare-earth ion R3+/R2+ replaces the cation Me2+ in the fluorite structure and causes distortion of the MeF2 crystal lattice near the impurity center, especially by non isovalent substitution. The full optimization of the R: MeF2 systems is made and the new coordinate geometry around rare earth ions were obtained.
Rare earth doped solid state lasers have several advantages: they are compact, they have a high efficiency and their beam quality is good. The main problem to reach high power is the heat ...
A comprehensive review of up-conversion (UP) and down-conversion (DC) or down shifting of rare earth (RE) doped zinc oxide (ZnO) nanophosphors is presented. Research interest in the development of RE3+ doped ZnO for UP and DC nanophosphors has been encouraged by the potential application of these materials in light emitting diodes and different types of photovoltaic cells.
It describes the erbium-doped fiber amplifier and its role as foundational in optical communication systems. This new edition is fully revised including new material on visible fluoride fiber lasers, single-frequency fiber lasers, broadband fiber sources, Qswitch fiber lasers, and rare-earth doped infrared-transmitting glass fibers.
Visible and near-IR luminescence via energy transfer in rare earth doped mesoporous titania thin films with nanocrystalline walls. Journal of Solid State Chemistry, Vol. 172, Issue. 1, p. Journal of Solid State Chemistry, Vol. 172, Issue. 1, p.
To overcome these issues, rare earth doped luminescent materials is the favorable route followed to convert these transmitted sub‐band‐gap photons into above‐band‐gap light, where solar cells typically have significant light‐scattering effects.
Therefore, the rare‐earth doped UCNPs have abundant energy levels and several excellent spectroscopic characters such as, long lifetime emission, narrow bandwidth, etc. 15-17 In addition, rare‐earth doped UCNPs have exhibited higher resistance to photoblinking and photobleaching as well as narrower emission bands compared to quantum dots ...
Solid-state powders such as rare-earth ions doped nano and micron size phosphors are one of the most promising candidates for several photonic applications discussed above. In this dissertation, we investigate the upconversion (UC) fluorescence characteristics of rare earth (RE) doped M2O2S (M = Y, Gd, La) oxysulphide phosphors, for near ...
Jan 27, 2020· In rare earth doped fibres there are additional mechanisms including excited state absorption, cooperative up-conversion, fluorescence quenching …
Moreover, the unit cell of titanium oxide doped with 10% of ytterbium and 2% of erbium has larger volume than these of TiO 2 doped with 1% of a rare earth element. However, the co-doped samples show lower crystallite sizes (between 8.9 and 13.4 nm), so that the reason for a unit cell volume increase cannot be unambiguously determined.
In conclusion, rare-earth Ln-doped monodisperse SnO 2 nanospheres with specific surface area of 130.0 m 2 g −1 are successfully synthesized by a solution-phase route. The doped SnO 2 nanospheres are used as scaffold to fabricate mesoporous perovskite solar cells. The observation of morphology, microstructure characterization, energy band ...
May 29, 2018· Spin coherence in rare-earth-doped nanoparticles. Experiments were carried out on 0.5 % Eu 3+:Y 2 O 3 nanoparticles of 400 ± 80 nm composed of 130 ± …
As a newly noninvasive emerging modality, NIR-II fluorescence imaging (1000–1700 nm) has many advantages over conventional visible and NIR-I imaging (700–900 nm). Unfortunately, only a few NIR-II fluorophores are suitable for bone imaging. Here, we report an NIR-II fluorophore based on DSPE-mPEG encapsulated rare earth doped nanoparticles ([email protected]), which shows inherent affinity …
Abstract. In this paper, a two-step process is developed to synthesize rare earth doped titania nanorods (RE–TiO 2 NRs) as photocatalysts for efficient degradation of lignin under simulated sunlight irradiation. In this approach, protonated titanate nanotubes with layered structures were first prepared by a hydrothermal approach, and rare earth metal ions were subsequently bound to the ...
To improve the biochar's adsorption performance towards phosphate as well as to endow the biochar with magnetic property, novel rare earth element doped magnetic biochars, Ce/Fe 3 O 4-BC and La/Fe 3 O 4-BC, were prepared by separately co-precipitating cerium (Ce) and lanthanum (La) with FeCl 3, FeCl 2 and biochar. For comparison, Fe 3 O 4-BC without doping Ce or La was also synthesized.
Oct 31, 2018· Bulk ionic conductivity of rare earths doped ceria will be the main subject of section Defect Chemistry and Transport Properties. Crystal size is another important parameter since for polycrystalline samples bulk and grain boundary domains affect conductivity differently. In the bulk, oxygen ions jump through the regular lattice, but at grain ...
An alternative approach to make a rare-earth doped polymer waveguide is by combining the excellent properties of SiO2 as a host for the rare-earth with the easy processing of polymers. The optical properties of Er-doped silica films made by an acid-catalysed sol-gel synthesis are reported in Chapter 6.
Jun 19, 2017· Rare-earth phosphors exhibit unique luminescence polarization features originating from the anisotropic symmetry of the emitter ion's chemical environment. However, to take advantage of this ...
Introduction. The invention and development of rare earth doped optical fibers led to a revolution in the design of robust and compact light sources with excellent beam quality and high conversion efficiency (Agrawal, 2007).These fiber-based sources have become essential parts in a wide range of applications, including telecommunications, nonlinear microscopy, optical coherent tomography, and ...
2. Synthesis of Rare Earth Doped Fluoride Nanomaterials. In the past decade, many efforts have been dedicated to prepare the RE-doped fluoride UCNPs with high quality in order to meet the requirement of various bio-related applications, in particular, smaller UCNPs …
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