Cerium Oxide Nanoparticles Confined in Doped Mesoporous Carbons: A Strategy to Produce Catalysts for Imine Synthesis.

A group of (doped N or P) carbons were synthesized using soluble starch as a carbon precursor. Further, ceria nanoparticles (NPs) were confined into these (doped) carbon materials. The obtained solids were characterized by various techniques such as N physisorption, XRD, TEM, SEM, XPS, and XAS.

On the role of Gdions in enhancement of UV emission from Yb-Tmup-converting LiYFnanocrystals.

Materials capable of emitting ultraviolet (UV) radiation are sought for applications ranging from theranostics or photodynamic therapy to specific photocatalysis. The nanometer size of these materials, as well as excitation with near-infrared (NIR) light, is essential for many applications. Tetragonal tetrafluoride LiY(Gd)Fnanocrystalline host for up-converting Tm-Ybactivator-sensitizer pair is a promising candidate to achieve UV-vis up-converted radiation under NIR excitation, important for numerous photo-chemical and bio-medical applications.

Thermochromic Luminescent Nanomaterials Based on Mn/Tb Codoping for Temperature Imaging with Digital Cameras.

A new thermographic nanocrystalline SrAlO:Mn,Tb phosphor was developed, and the concentrations of both dopants and the synthesis conditions were optimized. The combination of the thermally quenched luminescence from the Mn ions to the almost temperature-independent emission from Tb provides a sensitive luminescent thermometer ( = 2.8%/°C at 150 °C) with strong emission color variability.

Implementing Defects for Ratiometric Luminescence Thermometry.

In luminescence thermometry enabling temperature reading at a distance, an important challenge is to propose new solutions that open measuring and material possibilities. Responding to these needs, in the nanocrystalline phosphors of yttrium oxide YO and lutetium oxide LuO, temperature-dependent emission of trivalent terbium Tb dopant ions was recorded at the excitation wavelength 266 nm. The signal of intensity decreasing with temperature was monitored in the range corresponding to the D → F emission band.

LiAlO:Fe and LiAlO:Fe, Nd as a New Luminescent Nanothermometer Operating in 1st Biological Optical Window.

New types of contactless luminescence nanothermometers, namely, LiAlO:Fe and LiAlO:Fe, Nd are presented for the first time, revealing the potential for applications in biological systems. The temperature-sensing capability of the nanocrystals was analyzed in wide range of temperature (-150 to 300 °C). The emission intensity of the Fe ions is affected by the change in temperature, which induces quenching of the T (G) → A (S) Fe transition situated in the 1 biological window.

Structural modification of nanohydroxyapatite Ca(PO)(OH) related to Eu and Sr ions doping and its spectroscopic and antimicrobial properties.

The Eu and Sr ions co-doped hydroxyapatite nanopowders (Ca(PO)(OH)) were synthesized via a precipitation method and post heat-treated at 500 °C. The concentration of Eu ions was established in the range of 0.5-5 mol% to investigate the site occupancy preference.

Enhancing the Relative Sensitivity of V, V and V Based Luminescent Thermometer by the Optimization of the Stoichiometry of YAlGaO Nanocrystals.

In this work the influence of the Ga concentration on the luminescent properties and the abilities of the YAlGaO: V nanocrystals to noncontact temperature sensing were investigated. It was shown that the increase of the Ga amount enables enhancement of V emission intensity in respect to the V and V and thus modify the color of emission. The introduction of Ga ions provides the appearance of the crystallographic sites, suitable for V occupation.