Non-contact ratiometric thermometry has applications in areas such as industrial process monitoring.

Triplet transfer across a surface-anchored metal-organic-framework heterojunction is demonstrated by the observation of triplet-triplet annihilation photon -upconversion in sensitizer-emitter heterostructure. Upconversion thresholds under 1 mW cm-2 are achieved. In broader context, double-electron-exchange mechanism triplet indicates that quality sufficient for electrons to move between layers this solution-processed crystalline

The energy stored in the triplet states of organic molecules, capable transfer via an emissive process (phosphorescence) or a nonemissive (triplet–triplet transfer), is actively dissipated presence molecular oxygen. reason that photoexcited singlet oxygen highly reactive, so photoactive molecules system are quickly oxidized. Oxidation leads to further loss efficiency and various undesirable side effects. In this work we have developed structurally diverse library hyperbranched unsaturated...

Abstract The first energetically conjoined TTA‐assisted photon energy upconversion operating in cell tissue is described. synthesized nanocapsules with the encapsulated UC dye system consisting of an emitter and a sensitizer show very efficient emission aqueous dispersion under extremely low excitation intensity down to 0.05 W · cm −2 so that cells are not affected by light. demonstrated sub‐linear dependence crucial importance for life‐science applications as could serve local or situ...

In this paper, we demonstrate energetically conjoined triplet–triplet annihilation-assisted photon energy upconversion (UC) operating in an aqueous environment. Obtained micellar structures show very efficient UC emission a water environment under extremely low excitation light intensity, down to 10 mW cm−2. The demonstrated sub-linear intensity dependence of the is crucial importance for life science applications, allowing upconverted photons be generated even at that then serve as local,...

Abstract Non‐toxic and biocompatible triplet–triplet annihilation upconversion based nanocapsules (size less than 225 nm) were successfully fabricated by the combination of miniemulsion solvent evaporation techniques. A first type displays an spectrum characterized maximum emission at λ max = 550 nm under illumination red light, exc 633 nm. The second fluoresces 555 when excited with deep‐red 708 Conventional confocal laser scanning microscopy (CLSM) flow cytometry applied to determine...

Abstract The mechanism of particle formation from submicrometer emulsion droplets by solvent evaporation is revisited. A combination dynamic light scattering, fluorescence resonance energy transfer, zeta potential measurements, and cross‐correlation spectroscopy used to analyze the colloids during process. It shown that a different methods yields reliable quantitative data for describing fate results indicate coalescence plays minor role process; relatively large size distribution obtained...

Herein, we report near-infrared-to-visible up-conversion (UC) in SrF₂:Yb³⁺,Er³⁺ sub-micron crystals prepared <italic>via</italic> a facile route an aqueous solution.

We present a method for the fabrication of ultralight upconverting mats consisting rigid polymer nanofibers. The are prepared by simultaneously electrospinning an aqueous solution with pronounced oxygen-barrier properties and functional nanocapsules containing sensitizer/emitter couple optimized triplet-triplet annihilation photon upconversion. optical functionality is preserved during process. nanofibers demonstrate efficient upconversion fluorescence centered at λmax = 550 nm under low...

Absolute quantum yields for the individual emission bands in blue-emitting LiYF₄:Yb³⁺,Tm³⁺ UCNPs are reported, measured over a broad excitation power range by three independent research centers.

Efficient single-band NIR-to-NIR upconversion (UC) emission is strongly desired for many applications such as fluorescent markers, plastic recycling, and biological imaging. Herein, we report highly efficient UC in La2O3:Yb3+,Tm3+ (LYT) microcrystals. Under 980 nm laser excitation, LYT exhibits a NIR at ∼795 (Tm3+: 3H4 → 3H6) blue ∼476 nm; the dominant, with intensity ratio of to INIR/ Iblue > 100. Remarkably, high absolute quantum yield (UCQY) 3.4% obtained relatively low excitation power...

We present the excitation power and doping concentration dependent upconversion properties of SrF₂:Yb³⁺,Er³⁺ single crystals. The determined optical this bulk material can serve as benchmark values for cubic-phase nanomaterials.

Current plastic packaging waste management practices in Europe, but also other countries require improvement due to legal and societal requirements. To meet high recycling rates, significant changes among others post-consumer sorting become necessary. This stream is dominated by packaging. Inorganic fluorescent tracer materials (oxide crystals doped with ytterbium Yb3+ sensitizer ions either erbium (Er3+), holmium (Ho3+) or thulium (Tm3+) activator ions) enable a criterion which independent...

Efficient photon-harvesting materials require easy-to-deposit exhibiting good absorption and excited-state transport properties. We demonstrate an organic thin-film material system, a palladium–porphyrin-based surface-anchored metal–organic framework (SURMOF) thin film that meets these requirements. Systematic investigations using transient spectroscopy confirm triplets are very mobile within single crystalline domains; detailed analysis reveals triplet transfer rate on the order of 1010...

Optical properties of BaF₂ single crystals doped with Yb³⁺ and Er ions are studied. The highest <italic>ϕ</italic>_UC value 10.0% was demonstrated for the BaF₂:Er³⁺ (2 mol%) /Yb³⁺ (3 sample under 490 W cm⁻² 976 nm excitation.

Triplet energy transfer enables efficient <italic>Z</italic>-to-<italic>E</italic> photoswitching of azobenzenes even with near-infrared light. Ultrafast intersystem crossing azobenzene makes the process entropy-driven and use endothermic sensitizer-azobenzene pairs.

Coatings with vertical gradients in composition were produced by drying an aqueous polymer dispersion containing both charged and neutral particles. After drying, the component was enriched at film/air interface. The spontaneous segregation between two types of particles goes back to a difference collective diffusivity. As film dries, layer develops top. Due their mutual repulsion, spheres escape from this more quickly than counterparts. Provided that total time is times diffusion for...

The synergetic effect on the efficiency of triplet–triplet-annihilation-assisted photon upconversion, as a result synthetic procedure for simultaneous and independent optimization intrinsic efficiencies triplet–triplet transfer annihilation, is demonstrated (see picture). new system shows high upconversion quantum yields order 0.11. Detailed facts importance to specialist readers are published ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset. They made...

Quaternary tungstates with the composition Li3Ba2Gd3(WO4)8 doped different concentrations of Dy3+ (from 0.5 to 10 at%) were prepared by solid-state reaction method at 900 °C. Their structural, spectroscopic and optical properties studied systematically in this work. X-ray diffraction analysis confirmed crystallization have a monoclinic structure (sp. gr. C2/c); lattice constants for 1 at% doping concentration are = 5.2126(2) Å, b 12.7382(1) c 19.1884(3) Vcalc 1273,40(4) Å3 β × 91.890(9)°....

A model system for multicompartment nanofibers was fabricated by colloid electrospinning. The obtained nanostructured material consisted of fluorescent polymer nanoparticles that were synthesized in a miniemulsion and then embedded fluorescently labeled nanofibers. Because the absence contrast between both polymers, immobilized cannot be reliably identified via electron microscopy or other techniques. Here, we describe investigations on hybrid with two-color STED to localize quantify their...

We report near-infrared-to-visible La₂O₃:Yb³⁺,Er³⁺(LYE) UC materials with a high internal quantum yield (UCQY) of 3.8%, external UCQY (brightness) 1.6% and tunable emission color.

A novel combination of a poly(vinylidene fluoride) (PVDF) membrane with pore size 0.2 μm and photosensitizer 5,10,15,20-tetrakis (pentafluorophenyl)-21H,23H-porphine palladium(II) (PdTFPP) makes promising hybrid material for the generation singlet oxygen (1O2) and, thus, water treatment applications. The fabricated photocatalytic exhibits permeability 4280 ± 250 L·m–2·h–1·bar–1 stable degradation performance over 90 h period, when illuminated green light (528 20 nm) operated in dead-end,...

Abstract A ratiometric optical thermometer based on triply‐doped La 2 O 3 :Yb 3+ /Er /Nd microcrystals is reported with a relative sensitivity above 1% K −1 in the entire range from 300–700 K, and between 1.8–0.7% over 290–833 K. The 825 nm upconversion (UC) emission Nd 4 F 5/2 level relies thermally‐assisted energy transfer Yb ; thus, unusually, near‐infrared increases increasing temperature relevant range. More typically, two‐photon 660 UC Er 9/2 decreases intensity due to non‐radiative...