The intrinsic optical properties and peculiarities of the energy structure hafnium dioxide largely determine prospects for applying latter in new generation devices optoelectronics nanoelectronics. In this work, we have studied diffuse reflectance spectra at room temperature a nanostructured powder nominally pure HfO2 with monoclinic crystal and, as well its photoluminescence range 40–300 K. We...

Eu-doped SrS red-emitting phosphors show superior thermal quenching resistance and luminescent intensity when the energy transfer from Ce 3+ to Eu 2+ is boosted.

Binding of gefitinib (GEF), a promising anticancer drug to human serum albumin (HSA), the major transport protein in blood circulation was investigated using fluorescence, UV-vis absorption and circular dichroism (CD) spectroscopy as well as computational modeling. Fluorescence quenching of HSA upon GEF addition was found to be a static quenching process, as revealed from the decreasing trend o...

We report a high-repetition-rate, short-pulse, upconversion micro-laser prepared by the fast thermal quenching of lanthanide-doped nanoparticles (UCNPs).

the aggregation behavior of anionic cobalt(ii) 4,4′,4ʺ,4‴-tetrasulfonated phthalocyanine, [co(tspc)4-] was studied at its various concentrations and different ionic strengths using optical absorption and resonance light scattering (rls) spectroscopies in 5 mm phosphate buffer, ph 7.0 at 25 °c. the results show no aggregation behavior at concentration range of 5.1 × 10-6-7.5 × 10-5 m. also, the ...

Freeze-drying is one of the most used methods for preparing scaffolds and is very sensitive to the material and operational parameters such as nucleation temperature, thermal properties of the mold, cooling rate, set freezing point, and slurry height. In the present study, a Finite Element Method (FEM) based code was developed to investigate the effects of such parameters and to eventually ...

We present a detailed study of the gain length in an active medium obtained by doping of DNA strands with 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran dye molecules. The superior thermal stability of the composite and its low quenching permit one to obtain an optical gain coefficient larger than 300 cm(-1). We also demonstrate that such an active material is feasible for the...