Light fantastic! Lu(2)O(3):Yb(3+)/Er(3+)/Tm(3+) nanocrystals with controllable red, green, blue (RGB) and bright white upconversion luminescence by a single laser excitation of 980 nm have been successfully synthesized (see picture). Due to abundant UC PL colors, it can potentially be used as fluorophores in the field color displays, back light, lasers, photonics, biomedicine.Lu(2)O(3):Yb(3+)/Er(3+)/Tm(3+) solvothermal process followed subsequent heat treatment at 800 degrees C. Powder X-ray...

CaIn2O4:Eu3+ phosphors were prepared by a Pechini sol−gel process. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), photoluminescence (PL), cathodoluminescence (CL) spectra as well lifetimes utilized to characterize the samples. The XRD results reveal that samples begin crystallize at 800 °C, and crystallinity increases upon raising annealing temperature. FE-SEM images indicate consist of fine spherical grains with size around 200−400 nm. Under excitation...

Blue, yellow and white light emissive LaOCl:Tm3+, LaOCl:Dy3+ LaOCl:Tm3+,Dy3+ nanocrystalline phosphors were synthesized through the Pechini-type sol-gel process. X-Ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), photoluminescence (PL) cathodoluminescence (CL) spectra used to characterize samples. Under UV radiation (229 nm) low-voltage beam (0.5–5 kV) excitation, Tm3+-doped LaOCl phosphor shows a very strong blue emission corresponding characteristic transitions...

Ytterbium fluoride compounds with different crystal phases and morphologies, such as β-NaYbF4 hexagonal microdisks, microprisms, microtubes, α-NaYbF4 submicrospheres well YbF3 octahedra, have been synthesized via a facile hydrothermal route. X-Ray diffraction (XRD), scanning electron microscopy (SEM), transmission (TEM), high-resolution (HRTEM), selected area (SAED) photoluminescence (PL) spectra were used to characterize the samples. The intrinsic structural feature of ytterbium four...

The NaYF₄:Yb, Er@mSiO₂@Fe₃O₄-PEG nanoparticles combining dual-modal diagnostic methods and magnetically targeted anti-tumor therapy were investigated.

One-dimensional Tb2(WO4)3 and Tb2(WO4)3:Eu3+ nanowires have been prepared by a combination method of sol–gel process electrospinning. X-Ray diffraction (XRD), scanning electron microscopy (SEM), transmission (TEM), photoluminescence (PL), low voltage cathodoluminescence (CL) time-resolved emission spectra as well kinetic decays were used to characterize the resulting samples. The as-obtained precursor samples present fiber-like morphology with uniform size, formed after annealing. Under...

A symmetric (2+1)-dimensional Lotka–Volterra equation is proposed. By means of a dependent variable transformation, the firstly transformed into multilinear form and further decoupled bilinear by introducing auxiliary independent variables. Backlund transformation found then corresponding Lax pair derived. Explicit solutions expressed in terms pfaffian are given. As special case solutions, we obtain soliton dromions.

A Wronskian formulation is presented for the Boussinesq equation, which involves a broad set of sufficient conditions consisting linear partial differential equations. The representative systems equations in are explicitly solved. obtained solution formulae provide us with comprehensive approach to construct exact and explicit solutions by solitons, negatons, positons complexitons computed equation.

One-dimensional X(1)-Y(2)SiO(5):Ce(3+) and -Tb(3+) nanofibers quasi-one-dimensional microbelts have been prepared by a simple cost-effective electrospinning process. X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy (SEM), energy-dispersive spectrometry, transmission microscopy, high-resolution photoluminescence (PL), cathodoluminescence spectra were used to characterize the samples. SEM results indicate that as-prepared fibers belts are smooth...

A generalization of the Kaup–Newell spectral problem associated with sl is introduced and corresponding generalized hierarchy soliton equations generated. Bi-Hamiltonian structures resulting hierarchy, leading to a common recursion operator, are furnished by using trace identity, thus, Liouville integrability shown for all systems in new hierarchy. The involved bi-Hamiltonian property explored computer algebra system Maple.

Nanocrystalline LaOCl:Tb3+/Sm3+ phosphors were synthesized by a Pechini-type sol-gel process. Under UV and electron-beam excitation, show the characteristic emission of Tb3+ (5D3,4→7F6,...2) Sm3+ (4G5/2→6H5/2,7/2,9/2), respectively. In particular, cathodoluminescence (CL) color LaOCl:Tb3+ can be tuned from blue to green changing Tb3+-doped concentration, their CL intensities (brightness) are higher than those commercial products Y2SiO5:Ce3+ ZnO:Zn, White realized codoping with in...

Integrable couplings are associated with non-semisimple Lie algebras. In this paper, we propose a new method to generate integrable systems through making perturbation in matrix spectral problems for couplings, which is called the “completion process of couplings.” As an example, idea construction applied Ablowitz-Kaup-Newell-Segur coupling. Each equation resulting hierarchy has bi-Hamiltonian structure furnished by component-trace identity.

Photocatalytic water-splitting for hydrogen generation is a promising way to solve the energy crisis, yet design of efficient photocatalysts still challenge. By utilization first principles calculations, we predict photocatalytic properties monolayer boron phosphide (BP) based BP/XY2 (X = Mo, W; Y S, Se) composites different rotated configurations. Our results suggest that can be stably formed, and narrowed bandgaps ensure these are suitable absorbing visible light. The band edge positions...

Abstract This paper introduces recent activities on Marx-based compact repetitive pulsed power generators at the Institute of Applied Electronics (IAE), China Academy Engineering Physics (CAEP), over period 2010–2018. A characteristic feature described is use a simplified bipolar charged Marx circuit, in which normal isolation resistors or inductors to ground are removed make circuit simpler. Several pulse-forming modules developed generate 100 ns square wave output introduced, including...

Atmospheric-pressure plasma jet provides an effective mode for many potential applications. Unipolar repetitive pulses of 25-ns rise time and 40-ns duration are used to drive a single electrode in open air. He, Ar, N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , air chosen as the feed gases. Kinds images observed jets presented under different experimental conditions. The diffusive appearances with or flow from needle-like He Ar flow.

We present an integrable coupled differential-difference Kadomtsev–Peviashvili equation, which is derived by extending Ohta and Hirota's Pfaffianization procedure to the KP equation. Some Lie symmetries of this resulting system are also presented explicitly.

Effects of Cr, Mo, and Nb on the ferritic stainless steel Σ(210) grain boundary intragranularity are investigated using first-principles principle. Different positions solute atoms considered. Structural stability is lowered by Cr doping enhanced Mo doping. A ranking effect enhancing cohesive strength boundary, from strongest to weakest Nb. clearly prefers locate in intragranular region Fe rather than while tend segregate boundary. Solute possess a strong driving force for segregation...

A closed two-temperature-zone chemical vapor deposition (CVD) furnace was used to grow monolayer molybdenum disulfide (MoS2) by optimizing the temperature and thus evaporation volume of Mo precursor. The experimental results show that precursor has a large effect on size shape transformation MoS2, at lower <760°C, triangular MoS2 increases with elevating temperature, while higher >760°C, starts change from triangle truncated triangle. large-area side length 145 μm is achieved 760°C. Further,...

In this paper, we obtain the Nth-order rational solutions for defocusing nonlocal nonlinear Schrodinger equation by Darboux transformation and some limit technique. Then, via an improved asymptotic analysis method relying on balance between different algebraic terms, derive explicit expressions of all solitons with order 1<=N<=4. It turns out that are localized in straight or curves, exact approach curved a slower rate than ones. Moreover, find exhibit just five types soliton interactions,...