Upconversion luminescence of nano-sized Yb3+ and Tm3+ codoped rare earth phosphates, that is, LaPO4 YPO4, has been investigated under high-pressure (HP, up to ∼25 GPa) high-temperature (293-773 K) conditions. The pressure-dependent properties the nanocrystals, energy red shift band centroids, changes ratios, shortening upconversion lifetimes, so forth, make studied nanomaterials suitable for optical pressure sensing in nanomanometry. Furthermore, thanks large difference (∼1800 cm-1),...

Upconverting core@shell type β-NaYF4:Yb3+-Er3+@SiO2 nanorods have been obtained by a two-step synthesis process, which encompasses hydrothermal and microemulsion routes. The synthesized nanomaterial forms stable aqueous colloids exhibits bright dual-center emission (λex = 975 nm), i.e., upconversion luminescence of Er3+ down-shifting Yb3+, located in the first (I-BW) second (II-BW) biological windows spectral range, respectively. intensity ratios bands Yb3+ observed vis-near-infrared (NIR)...

Lanthanide-based luminescent nanothermometers play a crucial role in optical temperature determination. However, because of the strong thermal quenching luminescence, as well deterioration their sensitivity and resolution with elevation, they can operate relatively low-temperature range, usually from cryogenic to ≈800 K. In this work, we show how overcome these limitations monitor very high-temperature values, high (≈2.1% K–1) good (≈1.4 K) at around 1000 As an probe temperature, chose...

Remote temperature and pressure monitoring provides new exciting chances to explore the variation of luminescence properties compounds under extreme conditions. Herein, series Mn4+-activated, double perovskite Gd2ZnTiO6 phosphors were prepared develop novel, bifunctional sensors pressure. Upon 345 nm excitation, bright red emission originating from Mn4+ is generated, its intensity affected by doping content, where optimal achieved at 0.3 mol% doping. The determined concentration quenching...

To overcome the challenges of pressure monitoring with high sensitivity, we have designed a series Ce3+-activated Ca2Gd8Si6O26 phosphors outstanding sensing properties. Excited UV light, resultant can emit blue-violet luminescence, originating from optically active Ce3+ ions. The optimal doping content for ions in host lattices is 3 mol%, which concentration quenching mechanism dominated by electric dipole–dipole interaction. thermal stability prepared was explored measuring...

A new method was used to obtain Eu(3+)-doped LaOF nanocrystals. The obtained nanocrystals were synthesized for the first time using a modified Pechini sol-gel method. products analyzed by X-ray powder diffraction and Rietveld Optimal conditions synthesis found. Luminescent properties of tetragonal rhombohedral LaOF:Eu(3+) investigated collecting excitation luminescence spectra. most effective dopant concentrations in both hosts lifetimes also measured. time-resolved luminescent traces showed...

Bright green-yellow high-pressure luminescence of up-converting lanthanide nanocrystals – SrF₂:Yb³⁺/Er³⁺, for lifetime nanomanometry.

Abstract Currently the lowest optically determinable pressure values are around 10 2 bar, making below inaccessible for optical detection. This work shows first time how to overcome these limitations, and monitor low in a vacuum region (from ≈10 −5 −2 bar), utilizing light‐induced pressure‐governed heating–cooling of material. Herein, well‐defined temperature dependency luminescence intensity ratio Er 3+ thermally‐coupled levels (TCLs), is used elevation local upconverting material (YVO 4...

A novel, contactless optical sensor of pressure based on the luminescence red-shift and bandwidth (full width at half-maximum, fwhm) Ce3+-doped fluorapatite-Y6Ba4(SiO4)6F2 powder has been successfully synthesized via a facile solid-state method. The obtained material exhibits bright blue emission under UV light excitation. It was characterized using X-ray diffraction, scanning electron microscopy spectroscopy, including high-pressure measurements excitation spectra, up to above ∼30 GPa....

The concept of optical temperature sensing, based mainly on the band intensity ratio, line shift, or luminescence lifetimes, is utilized for noninvasive and rapid detection local values in inspected systems. For these purposes, lanthanide-doped nanoparticles (NPs) seem to be most promising nanothermometers, because they can use temperature-dependent emission as well ratios alike thermally coupled levels (TCLs) non-TCLs. Such thermal effects are especially pronounced case upconverting NPs,...

The growing interest in the miniaturization of various devices and conducting experiments under extreme conditions pressure temperature causes need for development small, contactless, precise, accurate optical sensors without any electrical connections. In this work, YF3:Yb3+-Er3+ upconverting microparticles are used as a bifunctional luminescence sensor simultaneous measurements. Different changes properties Er3+ green red upconverted luminescence, after excitation Yb3+ ions near-infrared...

Optical thermometers are of great interest due to their non-contact, high-sensitivity and fast measurement characteristics. In this work, a series dual-center Bi1.96−xMoO6: 0.02Er3+, 0.02Tm3+, xYb3+ (x = 0.10–0.35) upconverting materials were prepared by sol-gel synthesis method. Upon 975 nm excitation, the exhibit bright color-tunable (from yellow orange) upconversion (UC) emissions, as Yb3+ content increases. The thermometric properties synthesized associated with different...

Abstract The concept of optical temperature sensing using band intensity ratio is considered as one the most effective, self‐reference, non‐invasive, and rapid detection techniques for local in natural or engineered systems. In this work, first time a divalent lanthanide‐co‐doped dual‐center system, i.e., SrB 4 O 7 :Eu 2+ /Sm phosphors, working bifunctional ratiometric sensor pressure employed. With alterations, Eu luminescence emission lifetime Sm are significantly changed, showing...

This study focuses on luminescent materials based the antenna effect and prepared by sol−gel method. These are composed of a Eu(III) complex (luminescence center) entrapped in xerogel matrix. Luminescence properties lanthanide-based emitting depend efficiency energy transfer from absorption center (ligand) to emission (central ion) concentration quenchers (O−H oscillators) surrounding central ion. In this study, such luminescence as * lifetime quantum yield were improved modifying...

Nanophosphors based on cerium–strontium oxide (Sr2CeO4), doped with M2+ or Ln3+ (M = Ca, Mg, Ba, Zn; Ln Eu, Dy, Tm) were successfully prepared using a modified Pechini method. The structure of materials has been confirmed and characterized several techniques such as X-ray powder diffraction (XRD), scanning transmission electron microscopy (SEM TEM). obtained composed nanocrystals an average size around ∼50 nm. luminescence properties synthesized nanophosphors by excitation emission spectra...

Multifunctional, luminescent and magnetic systems were synthesised by a co-precipitation method broadly investigated. In our studies down- visible up-conversion of Yb3+ Tb3+ doped GdPO4 nanocrystals observed. The nanomaterials analysed X-ray diffraction (XRD) transmission electron microscopy (TEM). Spectroscopic properties determined from excitation emission spectra together with subsequent analysis. build-up characteristics luminescence decays showed the energy transfer processes that...

Nanocrystalline REF3:Tb3+ fluorides (where RE = Y, La, Ce, Gd, and Yb) have been synthesized using a precipitation method in water/glycerine system. Glycerine, which was added 25% by volume to Ln(NO3)3 NH4F reactant solutions, prevented an uncontrolled growth of the nanocrystals enhanced stability colloids formed water. X-ray analysis transmission electron microscopy confirmed formation fluoride nanocrystals. Additionally, presence glycerine on surface crystallites established basis IR...

Abstract Single‐phase KL aSr 3 ( PO 4 ) F: Sm 3+ phosphors with fluorapatite structure were prepared via high‐temperature solid‐state method in air atmosphere for the first time. The X‐ray diffraction, scanning electron microscope, diffuse reflectance spectra, photoluminescence and temperature‐dependent emission as well lifetimes measured to characterize as‐prepared phosphors. Phase results indicated that belongs hexagonal system a space group of P ‐6. Photoluminescence measurements showed...

New interesting aspects of the spectroscopic properties, magnetism, and method synthesis gadolinium orthovanadates doped with Eu3+ ions are discussed. Gd1–xEuxVO4 (x = 0, 0.05, 0.2) bifunctional luminescent materials complex magnetic properties were synthesized by a microwave-assisted hydrothermal method. Products formed in situ without previous precipitation. The crystal structures morphologies obtained nanomaterials analyzed X-ray diffraction transmission scanning electron microscopy....

The absorption characteristics of lanthanide-based functional materials are key importance for many scientists and engineers, e.g. in luminescence studies, bioimaging, optical heating/cooling, Raman spectroscopy, industrial applications such as new light sources, sensors, labeling tracing techniques, etc. Here we show the spectra solid, optically active lanthanide fluorides (CeF3, PrF3, NdF3, SmF3, EuF3, GdF3, TbF3, DyF3, HoF3, ErF3, TmF3, YbF3) oxides (CeO2, Pr6O11, Nd2O3, Sm2O3, Eu2O3,...