Abstract Nanoparticles of NaGdF 4 doped with trivalent erbium (Er 3+ ) and ytterbium (Yb are prepared by a modified thermal decomposition synthesis from trifluoroacetate precursors in 1‐octadecene oleic acid. The nanoparticles emit visible upconverted luminescence on excitation near‐infrared light. To minimize quenching this surface defects surface‐associated ligands, the coated shell . intensity upconversion is compared for that were an undoped (inert shell) similar particles Yb ‐doped...

Highly dispersible Tm3+/Yb3+-doped LiYF4 nanocrystals were synthesized using a thermal decomposition method. Upon excitation with NIR diode laser (980 nm), the dilute dispersion of exhibits several strong emissions in regions spanning deep-UV to NIR, all originating from single dopant/sensitizer (Tm3+/Yb3+) combination. The material is envisioned have potential interests anti-counterfeiting, biomedicine and solution-based scintillation applications. Detailed facts importance specialist...

The luminescence properties of hexagonal sodium gadolinium fluoride nanoparticles co-doped with Ho3+ and Yb3+ (NaGdF4:Ho3+/Yb3+), prepared using a thermal decomposition synthesis route, were evaluated following 980 nm excitation. synthesized easily dispersed in nonpolar solvents, showed an extremely narrow particle distribution, determined to have mean diameter 15.6 ± 1.2 nm. predominantly green upconversion emission was observed increase increasing concentration due enhanced energy transfer...

The development of metal-free bifunctional electrocatalysts for hydrogen and oxygen evolution reactions (HER OER) is significant but rarely demonstrated. Porous organic polymers (POPs) with well-defined electroactive functionalities show superior performance in reaction (HER) (OER). Precise control the active sites' local environment requires careful modulation linkers through judicious selection building units. Here, a systematic strategy introduced modulating functionality to design...

Highly durable porous battery-type supercapacitor charge storage material derived through electrochemical surface reconstruction of nickel cobalt pyrophosphate.

Tetragonal barium yttrium fluoride (BaYF5) nanocrystals doped with 0.5 mol % Tm3+ and 15 Yb3+ (BaYF5:Tm3+, Yb3+) were synthesized using the thermal decomposition method yielding rectangular-shaped (15 nm × 5 nm) that can (up)convert near-infrared light to higher energies such as blue, via a process known upconversion. The upconversion spectrum of BaYF5:Tm3+, nanocrystals, following excitation 980 nm, revealed upconverted blue emission from 1G4 → 3H6 transition was more intense than infrared...

We report the synthesis of Tm3+/Yb3+/Er3+-doped Lu3Ga5O12 nanocrystals prepared by a simple sol−gel method exhibiting bright white light following excitation with lower energy near-infrared (λexc = 980 nm) via an upconversion process. The combination upconverted blue (from Tm3+), green, and red Er3+) emissions resulted in luminescence, which is intense visible to naked eye at laser power less than 30 mW (3.4 W/cm2). calculated Commission internationale de l′éclairage (CIE) color coordinates,...

We report a facile microwave-assisted green synthetic route for colloidal poly(vinyl alcohol) (PVA)-coated europium (Eu(3+))-doped luminescent heavy metal bismuth oxyhalide (BiOX; X = Cl, Br, I) nanoflakes at low temperature and examine their structural, optical, photocatalytic characteristics. PVA coating onto the surface of endows them with hydrophilic nature. Both Eu(3+)-doped BiOCl BiOBr exhibit strong optical properties related to Eu(3+) Bi(3+) which are quenched in case BiOI matrix....

We report a green synthetic approach to the synthesis of water dispersible Ce3+/Tb3+-doped SrF2 nanocrystals, carried out using environment friendly microwave irradiation with as solvent. The nanocrystals display strong emission due energy transfer from Ce3+ Tb3+ ions. This ions is selectively quenched upon addition Cu2+ ions, thus making potential sensing material. There barely any interference by other metal on detection and limit low 2 nM. ability highly reversible...

Catalyzing hydrogen evolution reaction in alkali media is challenging owing to the sluggish kinetics, originated from water dissociation process. In this context, synergistic coupling between Ni/Co-based materials with transition metal dichalcogenides (TMDs) often accelerates alkaline (HER). Significant interaction two components and active-site density are keys for achieving a promising catalytic activity. This report emphasizes two-step selenization approach prepare Ni0.85Se/MoSe2...

Silica nanoparticles functionalized with β-cyclodextrin (CD) host molecules (5) have been prepared by reacting carboxylic active ester-terminated silica (4) CD heptamine. glucosamine (6), having similar surface properties as 5 but lacking the host−guest recognition motif, were used to perform blank experiments. The CD-functionalized determined TEM be 55 ± 6 nm in size. They exhibited pH-dependent aggregation, which is explained presence of free amino and acid groups on particle surface, was...

The upconversion process is reported to occur via interparticle energy transfer (IPET) achieved with Ln3+-doped BaLuF5 (Ln = Tm and Yb) nanocrystals in the size range of sub 5 nm. Both Yb3+ Tm3+ ions are independently doped nanocrystals. Colloidal mixtures containing above two show strong emission blue, red, near-IR regions IPET. As a service our authors readers, this journal provides supporting information supplied by authors. Such materials peer reviewed may be re-organized for online...

The white light emission of Tm3+/Yb3+/Ho3+-doped GdVO4 nanocrystals, following excitation with near-infrared (λexc = 980 nm), via a multiphoton upconversion process is presented. Upconverted blue from the Tm3+ ions as well green/red emissions Ho3+ contributes to observed light. calculated Commission internationale de l'éclairage (CIE) color coordinates were be x 0.34; y 0.32 and lie at center region. Furthermore, intensity upconverted was enhanced by incorporation monovalent Li+ into matrix....

In this Article, we report the synthesis of Ln(3+) (Yb(3+), Tm(3+))-doped BiPO4/BiVO4 nanocomposite photocatalyst that shows efficient photocatalytic activity under UV-visible-near-infrared (UV-vis-NIR) illumination. Incorporation upconverting ion pairs in BiPO4 nanocrystals resulted strong emission visible region upon excitation with a NIR laser (980 nm). A composite and vanadate was prepared by addition source to nanocrystals. nanocomposite, blue from Tm(3+) ions via upconversion is...

The unique optical characteristics of lanthanides (Ln3+) such as high color purity, long excited-state lifetimes, less perturbation excited states by the crystal field environment, and easy spectral conversion wavelengths through upconversion downconversion processes have caught attention many scientists in recent past. To broaden scope using these properties, it is important to make suitable Ln3+-doped materials, particularly colloidal forms. In this feature article, we discuss different...

We report for the first time synthesis of colloidal Ln3+/Yb3+ co-doped KY3F10nanocrystals (Ln = Er or Eu) viathermal decomposition. The transmission electron microscopy (TEM) studies indicated that average size nanocrystals was approximately 15 nm. crystallized in cubic Fmm space group as confirmed by Rietveld refinement X-ray powder diffraction patterns and analysis. Eu3+ ion used a spectroscopic probe its emission spectrum showed lanthanide ions replaces Y3+ lattice structure. When with...

Here we report on the enhancement of intensity green/red emission ratio in Er3+/Yb3+-doped GdVO4 nanocrystals obtained via upconversion process. The were synthesized using a sol–gel process followed by solid-state reaction. A series samples bearing different sensitizer ion (Yb3+) concentrations studied and characterized. Tripositive erbium (Er3+)-doped shows two strong emissions green region near 525 550 nm while relatively weak red is centred at 660 nm. 5-fold increase observed for sample...

Abstract This article describes a green synthetic approach to prepare water dispersible perovskite‐type Eu 3+ ‐doped KZnF 3 nanoparticles, carried out using environmentally friendly microwave irradiation at low temperature (85 °C) with as solvent. Incorporation of ions into the matrix is confirmed by strong red emission upon ultraviolet (UV) excitation nanoparticles. The nanoparticles are coated poly(acrylic acid) (PAA), which enhances dispersibility in hydrophilic solvents. from selectively...

An ionic liquid-triazine and KI combination was found to be an efficient catalyst for epoxide cyclic carbonate conversion under CO₂ filled balloon conditions.

Abstract The development of MoS 2 in the metallic phase (1T‐MoS ) is paramount interest as it exhibits superior electrochemical activities compared to its semiconducting polymorph (2H‐MoS ). In this work, an ionic liquid (IL)‐assisted solvothermal method was employed produce thermodynamically metastable 1T‐MoS . Structural characterization material suggests intercalation IL into De‐intercalation ILs from leads formation 2H‐MoS Carbon cloth‐supported @CC) shows higher electrocatalytic...

Despite predictions of high electrocatalytic OER activity by selenide-rich phases, such as NiCo2Se4 and Co3Se4, their synthesis through a wet-chemical route remains challenge because the sensitivity various oxidation states selenium to reaction conditions. In this work, we have determined contribution individual reactants behind maintenance conducive solvothermal conditions produce phase-pure Co3Se4 from elemental selenium. The reductive throughout was found be crucial for synthesis,...

The quest toward sustainability and decarbonization demands the development of methods for efficient carbon dioxide capture utilization. nonreductive CO2 fixation into epoxides to prepare cyclic carbonates has gained attention in recent years. In this work, we report guanidine hydrochloride-functionalized γ alumina (γ-Al2O3), prepared using green solvents, as an bifunctional catalyst fixation. resulting guanidine-grafted γ-Al2O3 (Al-Gh) proved be excellent from with high selectivity....

Introducing foreign elements into a crystal lattice could trigger phase transformation, serving as an excellent means to fabricate highly electrocatalytic phases. NiCo2S4 is notably thiospinel phase, normally synthesized via two‐step route and rarely explored for hydrazine oxidation reaction (HzOR). This work reports one‐step hydrothermal syntheses of CuCo2S4 their performance HzOR oxygen evolution (OER). Time‐dependent suggest formation (M, Co)9S8; M=Ni/Cu followed by conversion the...

Utilization of carbon dioxide (CO2) as a C1 feedstock to synthesize value-added chemicals using catalyst made from earth-abundant elements and under mild conditions is sustainable approach toward neutrality but difficult achieve. Herein, the CoAl2O4/Al2O3 composite developed used for light-driven epoxide cyclic carbonate conversion CO2. catalysts (x% Co–Al2O3) are prepared by calcining cobalt-incorporated Al-oxy-hydroxide at 500 °C an air atmosphere. The 15% Co–Al2O3 (57% Al2O3 43% CoAl2O4)...

Abstract Controlled and optimized heterogenic interfacial coupling is the key to enhance electrochemical performance. Herein, for first time, telluride‐based Co 9 S 8 /CoTe 2 heterostructure reported as a bifunctional catalyst energy‐efficient H generation. Detailed investigations suggest that leads superior performance of heterostructure. Furthermore, it displays excellent hydrazine oxidation reaction (HzOR) at industrial‐level current density (500 mA cm −2 @ 338 mV) using an...