Under 980 nm excitation, unusual 3P2-->3H6 (approximately 264 nm) and 3P2-->3F4 309 emissions from Tm3+ ions were observed in hexagonal NaYF4:Yb3+ (20%)/Tm3+ (1.5%) microcrystals. In comparison with the strong 1D2 1I6, 1G4 3H4 almost vanished due to efficient cross-relaxation of + 3H4-->3F4 1D2(Tm3+). Double logarithmic plots upconversion emission intensity versus excitation power are neither straight lines nor typical saturation curves. Theoretical analysis indicated that complicated...

Abstract Defective silica sphere arrays having locally hexagonal‐closed‐packed structure but lack of long range ordering were incorporated into organic light emitting diodes as grating to extract the waveguided trapped in indium tin oxide/organic layers and glass substrate. Using these defective gratings for extraction, broad band lambertian emitters are obtained due periodicity broadening random orientation gratings, resulting enhancements current power efficiencies by a factor 1.7 1.9,...

During brain injury, extracellular adenosine and glutamate levels increase rapidly dramatically. We hypothesized that local in the dictates adenosine–adenosine A 2A receptor (A R) effects on neuroinflammation damage outcome. Here, we showed that, presence of low concentrations glutamate, R agonist 3-[4-[2-[[6-amino-9-[(2 ,3 ,4 S ,5 )-5-(ethylcarbamoyl)-3,4-dihydroxy-oxolan-2-yl]purin-2-yl]amino]ethyl]phenyl]propanoic acid (CGS21680) inhibited lipopolysaccharide (LPS)-induced nitric oxide...

It is well known that the upconversion luminescence from lanthanide metal–organic frameworks (Ln-MOFs) difficult to achieve, and thus, there are few reports on dual luminescence-based MOFs. Here, dual-mode light-emitting Ln-MOFs synthesized using a low-cost hydrothermal method. Our results show obtained not only have high thermal stability (up 420°) but also stable in deionized water. The up- downconversion simultaneously observed Er–Eu-MOFs. temperature-dependent fluorescence decay time...

Abstract The effect of rare earth (RE) single atoms on photocatalytic activity is very complex due to its special electronic configuration, which leads few reports the RE atoms. Here, Dy 3+ atom composite photocatalysts are successfully constructed based both role and advantages CdS/g‐C 3 N 4 heterojunction in field photocatalysis. results show that an efficient way electron transfer provided promote charge separation, dual functions CO 2 molecular activation rare‐earth f levels as transport...

Inorganic metal halide-based perovskites have tremendous potential for use in solid-state lighting due to their earth-abundant elements, solution processability, high photoluminescence quantum yield (PLQY), and tunable band gap energy emission. However, the stability issue remains a challenge. Here, we report of 3D printing technique fabricate resin-perovskite color conversion layers bridge between material development device applications. This not only simplified fabrication process but...

A growth mechanism was proposed for YF3 nanocrystals forming in the quaternary reverse microemulsion system with water/cetyltrimethylammonium bromide/cyclohexane/1-pentanol. In mechanism, primary particles are formed by constant collision, fusion, and fission of micelles. These can further self-organize to one-dimensional nanostructure at room temperature. Results X-ray diffraction transmission electron microscopy reveal that each nanobundle consists numerous nanowhiskers a mean length ∼700...

The improvement of light extraction efficiency InGaN light-emitting diodes (LEDs) using microsphere arrays with various refractive indices was analyzed. Finite-difference time-domain (FDTD) simulations show that the use ( <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</i> <sub xmlns:xlink="http://www.w3.org/1999/xlink">microsphere</sub> = 500 nm) 1.8 and 2.5 led to increase in LEDs by 1.9 times 2.2 times, respectively. enhancement is attributed...

The enhancement of light extraction efficiency InGaN quantum well emitting diodes (LEDs) was achieved by employing the refractive index matched TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> microsphere arrays. optimization studies dipping method and rapid convective deposition (RCD) were carried out for arrays onto LEDs. two-dimensional (2D) close-packed deposited using optimized conditions RCD methods, respectively. efficiencies...

Recently, lead halide perovskite nanocrystals (NCs) have gained tremendous attention in optoelectronic devices due to their excellent optical properties. However, the toxicity of limits practical applications. Here, synthesis Zn2+-alloyed CsZnxPb1-xX3 (up 15%) NCs is reported achieve lead-reduced white light-emitting diodes (WLEDs). The incorporation Zn2+ into CsPbX3 host results a lattice contraction, without altering structure and morphology, which has direct effect on blue-shifts...

Abstract All‐inorganic halide perovskites (CsPbX 3 , X = Cl − Br and I ) are brought to the forefront of research focus in field modern lighting technology. However, due toxic element (Pb 2+ ), environmentally friendly white‐light emissions difficult achieve, thus limiting their practical applications. Herein, high‐quality Mg ‐alloyed CsPb 1− x (up 20%) nanocrystals (NCs) synthesized. The structural optical properties investigated. application these NCs white‐light‐emitting diodes (LEDs) is...

Abstract It is still challenging to design a stable and efficient catalyst for visible‐light CO 2 reduction. Here, Er 3+ single atom composite photocatalysts are successfully constructed based on both the special role of advantages Zn GeO 4 /g‐C 3 N heterojunction in photocatalysis reduction . Especially, :Er obtained by situ synthesis not only more conducive tight junction g‐C , but also favorable anchor rare‐earth atoms. Under irradiation, shows than five times enhancement catalytic...

Under 980 nm excitation, upconversion (UC) emissions in the UV range of 270-320 were observed nanocrystals Y0.795−xGdxYb0.2Tm0.005F3 (x=0, 0.1, 0.2, 0.5, and 0.795), which synthesized through a hydrothermal method. These UC can be assigned to transitions 6IJ, 6PJ→8S7/2(Gd3+), 3P0/1I6→3H6 (Tm3+). The energy transfer from Tm3+ Gd3+ plays crucial role populating excited states Gd3+. shortest wavelength upconverted emission converted infrared region was demonstrated here.

Water soluble YVO4:Ln3+ and YVO4:Ln3+/Ba2+ (Ln = Ce, Dy, Eu, Sm) nanocrystals were synthesized by a polyvinylpyrrolidone-assisted hydrothermal method. Under the excitation of host absorption, phosphors can emit blue light for YVO4:Ce3+/Ba2+, yellow YVO4:Dy3+/Ba2+, red YVO4:Eu3+/Ba2+, reddish orange YVO4:Sm3+/Ba2+. In comparison with those nanocrystals, emissions are greatly enhanced. Furthermore, spectra YVO4:Eu3+/Ba2+ YVO4:Dy3+/Ba2+ show similar features, which different from YVO4:Sm3+/Ba2+...

Stromal cell-derived factor-1 (SDF-1) and its membrane receptor C-X-C chemokine type 4 (CXCR4) are involved in the homing migration of multiple stem cell types, neovascularization, proliferation. This study investigated hypothesis that bone marrow-derived mesenchymal cells (BMSCs) accelerate skin wound healing mouse model by overexpression CXCR4 BMSCs. We compared SDF-1 expression times BALB/c mice, severe combined immunodeficiency (SCID) immune system-deficient nude mice after (60)Co...

Comprehensive studies were carried out to investigate potential applications of hybrid metal halide perovskites in next-generation white light-emitting diodes (LEDs). We investigated the effect spectral power distributions on color quality light provide guidelines for designing LED devices. The was obtained by combining appropriate ratios blue, green, yellow, and red emitted from [MAPb(BrxI1-x)3]. characteristics evaluated calculating CIE 1931 chromaticity coordinates, correlated temperature...

Multifunctional nanomaterials for bioprobe and drug carrier have drawn great attention their applications in the early monitoring progression treatment of cancers. In this work, we developed new multifunctional water-soluble NaLnF4@MOF-Ln nanocomposites with dual-mode luminescence, which is based on stokes luminescent mesoporous lanthanide metal-organic frameworks (MOFs-Y:Eu3+) anti-stokes NaYF4:Tm3+/Yb3+ nanoparticles. The fluorescence mechanism dynamics are investigated these as bioprobes...

In the heterogeneous SAC system (SrTiO₃:Er³⁺/g-C₃N₄), single Er atoms perfectly play multiple roles as interfacial electronic transfer bridges and active sites for CO₂activation.