A new thermographic nanocrystalline Sr

The luminescence kinetics of Ti3+ ions, resulting from the spin-allowed 2E → 2T2 electron transition, are generally expected to be fast, within microsecond range. However, in this study, we observed average lifetimes up 30 ms nanocrystalline LaAlO3:Ti3+ powders. Our detailed analysis spectroscopic and thermoluminescence properties suggests that prolonged is associated with presence traps proximity excited state conduction band, which facilitates energy transfer between them. Furthermore,...

The influence of the crystal field strength and host material composition on spectral position emission band thermal stability Fe³⁺luminescence was investigated in order to develop a highly sensitive luminescence thermometer.

New types of contactless luminescence nanothermometers, namely, LiAl5O8:Fe3+ and LiAl5O8:Fe3+, Nd3+ are presented for the first time, revealing potential applications in biological systems. The temperature-sensing capability nanocrystals was analyzed wide range temperature (-150 to 300 °C). emission intensity Fe3+ ions is affected by change temperature, which induces quenching 4T1 (4G) → 6A1 (6S) transition situated 1st window. highest relative sensitivity (0 50 °C) found be 0.82% °C (at 26...

From quencher to potent activator – multimodal luminescence thermometry with Fe³⁺ in the oxides MAl₄O₇ (M = Ca, Sr, Ba).

Numerous methods are known to improve the relative temperature sensitivity of luminescent thermometers. These include optimization host material, size nanoparticles, dopant ion type and concentration, or excitation intensity operation mode source. Here we propose a new approach, which exploits dependent sensitized emission from Nd3+ Yb3+ lanthanide ions in YVO4 matrix. We found out that ratio these two activators strongly depends on temperature, nanocrystals concentration. The novelty comes...

The Eu3+ and Sr2+ ions co-doped hydroxyapatite nanopowders (Ca10(PO4)6(OH)2) were synthesized via a precipitation method post heat-treated at 500 °C. concentration of was established in the range 0.5–5 mol% to investigate site occupancy preference. set 5 mol%. structural morphological properties obtained materials studied by an X-ray powder diffraction, transmission electron microscopy techniques infrared spectroscopy. As nanoparticles 11–17 nm annealed particles 20–26 nm. luminescence...

In this work the influence of Ga3+ concentration on luminescent properties and abilities Y3Al5-xGaxO12: V nanocrystals to noncontact temperature sensing were investigated. It was shown that increase amount enables enhancement V4+ emission intensity in respect V3+ V5+ thus modify color emission. The introduction ions provides appearance crystallographic sites, suitable for occupation. Consequently, facilitates → interionic energy transfer throughout shortening distance between interacting...

The relative sensitivity and usable temperature range of Fe³⁺,Cr³⁺-based luminescent thermometers can be tuned by modification the crystal field strength.

Due to the fact that temperature is one of key physical quantities determining occurrence phenomena, chemical reactions or biological processes, important issues be solved precise determination temperature.

Metal clusters oxide were embedded in an N-doped carbon and used as catalysts for the activation of peroxydisulfate or peroxymonosulfate selective oxidation benzyl alcohol. Quenching tests done to investigate reaction mechanism.

A group of (doped N or P) carbons were synthesized using soluble starch as a carbon precursor. Further, ceria nanoparticles (NPs) confined into these (doped) materials. The obtained solids characterized by various techniques such N2 physisorption, XRD, TEM, SEM, XPS, and XAS. These materials used catalysts for the oxidative coupling between benzyl alcohol aniline model reaction. Ceria immobilized on mesoporous-doped shows higher activity than other materials, benchmark catalysts, most...

In luminescence thermometry enabling temperature reading at a distance, an important challenge is to propose new solutions that open measuring and material possibilities. Responding these needs, in the nanocrystalline phosphors of yttrium oxide Y2O3 lutetium Lu2O3, temperature-dependent emission trivalent terbium Tb3+ dopant ions was recorded excitation wavelength 266 nm. The signal intensity decreasing with monitored range corresponding 5D4 → 7F6 band. On other hand, defect obtained upon...

Due to a number of its advantages, luminescence thermometry has been strongly developed strand temperature metrology over period time. Although there are several different types luminescent thermometers, recently attention focused on new single-band ratiometric approach, which is based the excited state absorption phenomenon. Nevertheless, since this process nontrivial and not studied extensively in context date, studies necessary enable intentional development highly sensitive thermometers...

A new, effective method for stabilization of Rh_xCe_1−xO_2−y nanoparticles synthesized by the reverse microemulsion their deposition on functionalized alumina has been successfully applied systems in a wide range Rh contents (<italic>x</italic> ≤ 0.15).

Abstract Uniform, highly dispersed (&lt;5 nm) Rh 0.15 Ce 0.85 O 2‐y nanoparticles deposited on the alumina support functionalized with alkylsilane were obtained in this work and studied detail, to characterize their basic properties thermal stability oxidizing reducing atmosphere. In next step, possibility perform reversible ex‐solution of environment (500 °C, H 2 ), its redispersion into cerium oxide structure (400 air) was use a wide range experimental methods (XRD, Raman spectroscopy,...

Luminescence thermometry is a remote temperature measurement technique that relies on thermally induced changes in spectroscopic properties.

Luminescence thermometry (LT) is a remote technique of temperature monitoring, which shows immense potential and has become very popular among researchers in recent years. LT can be realized by several different measurement methods, but one the most recently proposed least studied relies on single-band ratiometric (SBR) approach. In SBR approach, readout achieved from single emission band being photoinduced two excitation conditions, i.e. ground (GSA) excitated (ESA) state absorption....

Coating luminescent nanoparticles with a SiO2 shell provides numerous benefits, which include improving the dispersibility of nanoparticles, reducing their cytotoxicity, and facilitating biofunctionalization. However, from perspective thermometry, it is important that such procedure does not alter thermometric properties nanothermometer. Therefore, in this work, effect encapsulation on YAG:V3+,Nd3+ was investigated. It demonstrated increasing thickness layer increases thermal stability...