The chemical architecture of lanthanide doped core–shell up-converting nanoparticles can be engineered to purposely design the properties luminescent nanomaterials, which are typically inaccessible their homogeneous counterparts. Such an approach allowed shift up-conversion excitation wavelength from ∼980 more relevant ∼808 nm or enable Tb Eu emission, was previously impossible obtain inefficient. Here, we address issue limited temperature sensitivity range optical based nano-thermometers....

Upconversion nanoparticles (UCNPs) are some of the most promising nanomaterials for bioanalytical and biomedical applications. One important challenge to be still solved is how UCNPs can optimally implemented into Förster resonance energy transfer (FRET) biosensing bioimaging highly sensitive, wash-free, multiplexed, accurate, precise quantitative analysis biomolecules biomolecular interactions. The many possible UCNP architectures composed a core multiple shells doped with different...

CH3 NH3 PbBr3 perovskite nanoparticles (PAD ) are prepared with a photoluminescence quantum yield of ≈100% in air atmosphere by using the quasi-spherical shaped 2-adamantylammonium bromide (ADBr) as only capping ligand. The photostability under wet conditions this kind is enhanced cucurbit[7]uril-adamantylammonium (AD@CB) host-guest complexes

Abstract Despite the significant advancements of developing upconversion nanoparticles (UCNPs) for high performance biosensing and bioimaging, development DNA‐functionalized UCNPs with thin coatings, efficient surface passivation, fully functional DNAs hybridization sensing in biological media remains extremely challenging. Here, a straightforward concept labeling DNA to polysulfonate polymer layer on is presented. Both preserve their full functionality as demonstrated by Förster resonance...

Upconversion materials have led to various breakthrough applications in solar energy conversion, imaging, and biomedicine. One key impediment is the facilitation of such processes at molecular scale solution where quenching effects are much more pronounced. In this work, solution-state cooperative luminescence (CL) upconversion arising from a Yb excited state explored mechanistic origin behind sensitisation (CS) Yb/Tb systems investigated. Counterintuitively, best UC performances were...

An unprecedented efficiency of upconversion is observed in a nonanuclear Yb₈Tb complex with green emission upon NIR excitation Yb.

Luminescent upconversion nanocrystals (UCNCs) have become one of the most promising nanomaterials for biosensing, imaging, and theranostics. However, their ultimate translation into robust luminescent probes daily use in biological medical laboratories requires comprehension control many possible deactivation pathways that cause luminescence (UCL) quenching. Here, we demonstrate thorough modeling UCL rise decay kinetics using a freely accessible software can identify quenching mechanisms...

Upconversion nanoparticles (β-NaYF4:Er3+, Yb3+, UCNPs) were capped with a thin polymer shell by replacing the oleate ligand of hydrophobic UCNPs multidentate thiolate-grafting P(MEO2MA-co-SEMA) copolymers. The presence 2-(2-methoxyethoxy)ethyl side chains MEO2MA extending out nanohybrid made them water-dispersible. UCNP@P(MEO2MA-co-SEMA) nanohybrids exhibited an enhanced emission up to factor 10, as compared that their precursor in dichloromethane and even water (a 2). Moreover,...

A nanohybrid comprising a diiodo-substituted Bodipy anchored to the surface of NaYF₄:Er³⁺, Yb³⁺ nanoparticles showed its effectiveness in inducing cancer cell death under NIR irradiation.

Upconversion‐perovskite nanohybrids are prepared by assembling CH 3 NH PbBr perovskite nanoparticles (PK) with naked NaYF 4 :Yb 3+ ,Tm (UC n ) via an innovative strategy consisting of using cucurbit[7]uril (CB[7]) to anchor the firmly and closely upconversion nanoparticles, thus leading UC @PK CB nanohybrids. A commercial multiphoton laser scanning confocal microscope is used demonstrate successful assembly. This technique proves be useful evaluate luminescence lifetime in range several tens...

Theranostic upconversion nanoparticles (UCNPs) are ideal candidates for personalized medicine. We present a smart, easy-to-prepare nanohybrid (NH) suitable NIR-theragnosis and imaging tracking without triggering therapy simultaneously. The photophysical features of each component have been carefully selected in order to maximize the capabilities theragnosis, particular, emission photosensitizer absorption. In addition, NH presents fluorescent marker with one-photon absorption green...

Fluorescence signal enhancement via isothermal nucleic acid amplification is an important approach for sensitive imaging of intra- or extracellular protein biomarkers. Rolling circle (RCA) frequently applied fluorescence in situ but faces limitations concerning multiplexing, dynamic range, and the required multiple washing steps before imaging. Here, we show that Förster resonance energy transfer (FRET) between fluorescent dyes lanthanide (Ln) complexes hybridize to β-actin-specific RCA...

FRET from upconversion nanoparticles to dyes using 980 nm and 808 excitation.

Abstract Lanthanide‐doped nanoparticles (LnNPs) have become an important class of fluorophores for advanced biosensing and bioimaging. LnNPs that are photosensitized by surface‐attached antenna ligands can possess exceptional brightness. However, their functional bioconjugation remains challenge translation into bioanalytical applications. To solve this problem, we designed a ligand be simultaneously applied as efficient light harvesting Tb surface ions strong linker biomolecules to the...

Spontaneous adsorption of cucurbit[<italic>n</italic>]uril CB[<italic>n</italic>] (<italic>n</italic> = 6 and 7) on the surface naked upconversion nanoparticles (UCNPs) gave rise to UCNP@CB[<italic>n</italic>] exclusion complexes which can act as scaffolds basic dyes.

β-NaYF₄:Yb³⁺,Er³⁺ upconversion nanoparticles coated with a thin shell of biocompatible copolymer comprising 2-hydroxyethylmethacrylate and 2-acrylamido-2-methyl-1-propanesulfonsulfonic acid are water-dispersible remarkably resistant to strong acidic conditions.

Abstract Artificial chiral nanoparticles exhibit unique optical and (photo)physical properties. They can be all‐inorganic or organic–inorganic materials that are usually confined to the nanoscale by anchoring organic ligands their surface. The also possess distinctive and/or properties, thereby adding functionality whole nanosystem constituting an nanohybrid. Development of luminescent nanohybrids is pertinent many applications, such as (bio)sensing, therapeutics, photocatalysis,...

The first excited electronic state of molecular oxygen, O2(a1Δg), is formed in the upper atmosphere by photolysis O3. Its lifetime over 70 min above 75 km, so that during day its concentration about 30 times greater than In order to explore potential reactivity with atmospheric constituents produced meteoric ablation, reactions Mg, Fe, and Ca O2(a) were studied a fast flow tube, where metal atoms either thermal evaporation (Ca Mg) or pulsed laser ablation target (Fe), detected induced...

Nanoparticles for medical use should be non-cytotoxic and free of bacterial contamination. Upconversion nanoparticles (UCNPs) coated with cucurbit[7]uril (CB[7]) made by combining UCNPs oleic acid, here termed bare (UCn), CB[7], i.e., UC@CB[7] nanohybrids, could used as photoactive inorganic-organic hybrid scaffolds biological applications. UCNPs, in general, are not considered to highly toxic materials, but the release fluorides lanthanides upon their dissolution may cause cytotoxicity. To...

Steady-state and time-resolved emission studies on nanohybrids consisting of NaYF4:Yb,Er a diiodo-substituted Bodipy (UCNP-IBDP) show that the Yb(3+) metastable state, formed after absorption near-infrared (NIR) photon, can decay via two competitive energy transfer processes: sensitization IBDP second NIR photon population Er(3+) excited states.

Gold nanoparticles capped with oleylamine can be effectively transferred from an organic solvent to water in the presence of acetamidine surfactant by CO2 bubbling and then reverted back phase N2 bubbling.

Excitation at 800 nm effectively triggers the upconversion emission of NaYF₄:Yb,Er(Tm)/NaYF₄ core–shell nanoparticles with Nd³⁺ anchored organic capping by using cucurbituril[7] as an adhesive.

Texture and phase recognition analysis (TPRA) based on electron nanodiffraction technique is used to characterize the geometry of up-conversion nanocrystals (UCNCs) synthesized by common thermal-decomposition protocol in presence a stoichiometric amount NH4F. Here, we confirmed experimentally that despite apparently different shapes samples (hexagons, rods, cubes), all are actually β-phase hexagonal prisms. This relevance since many biological features nanostructures, such as cellular...