Role of Eu and Dy Concentration in the Persistent Luminescence of SrMgSiO Glass-Ceramics.

In this study, glass-ceramics based on SrMgSiO phosphor co-doped with Eu/Dy were obtained from the sintering and crystallisation of glass powders. The glasses were melted in a gas furnace to simulate an industrial process, and the dopant concentration was varied to optimise the luminescence persistence times. The doped parent glasses showed red emission under UV light excitation due to the doping of Eu ions, while the corresponding glass-ceramics showed persistent blue emission corresponding to the presence of Eu in the crystalline environment.

Erbium(III) ion-doped borate-based glasses for 1.53 μm broad band applications.

Novel erbium(III) ion-doped borate-based glasses (Er :BCNF) by conventional melt-quenching technique were designed and synthesized. The glasses were characterized for their structural, vibrational and spectroscopic properties. The nephelauxetic ratio, bonding parameters, and Judd-Ofelt (JO) intensity parameters (Ω λ = 2, 4 and 6) were determined by using absorption spectrum of 1 mol% Er O doped glass.

Silicon Oxycarbide and Silicon Oxycarbonitride Materials under Concentrated Solar Radiation.

The potential application of silicon oxycarbonitride (SiOCN), silicon oxycarbide (SiOC) and silicon oxycarbide-SiC (SiOC-SiC) for photothermal devices such as volumetric solar absorbers has been studied evaluating the response to thermal shock from a Fresnel lens. The accelerated ageing test comprises fast heating (32 °C min) and cooling rates (27 °C min) from 100 to 1000 °C and dwelling times of 10 min. Porous materials (SiOCN and SiOC) failed the thermal shock tests; they were massively degraded by the formation of a large depression in the focus of solar radiation.

Tunable upconversion emission in NaLuF-glass-ceramic fibers doped with Er and Yb.

Novel glass-ceramic optical fibers containing NaLuF nanocrystals doped with 0.5ErF and 2YbF (mol%) have been prepared by the rod-in-tube method and controlled crystallization. NaLuF nanocrystals with a size around 20 nm are obtained after heat treatment at 600 °C.

Application of a glass fertilizer in sustainable tomato plant crops.

Background: Glass frits with a P O /K O ratio equal to 0.65 and different concentrations of SiO (6.5-56.

Drug kinetics release from Eudragit - Tenofovir@SiOC tablets.

A novel drug release system has been obtained in form of tablets from Eudragit® RS and tenofovir loaded on porous silicon oxycarbide glasses (SiOC). Active carbon (AC) and mesoporous silica (MCM-41) have also been used for comparative purposes. The porous silicon oxycarbide presents a bimodal mesopore size distribution that is maintained after functionalization with amino groups.

Structure, biodegradation behavior and cytotoxicity of alkali-containing alkaline-earth phosphosilicate glasses.

We report on the effect of sodium on the structure, chemical degradation and bioactivity of glasses in the CaO-MgO-SiO2-P2O5-CaF2 system. The (29)Si and (31)P magic angle spinning-nuclear magnetic resonance spectroscopy of melt-quenched glasses with varying Na2O/MgO ratios exhibit a silicate glass network with the dominance of Q(2)(Si) units and phosphorus mainly forming orthophosphate species. Sodium incorporation in the glasses did not induce a significant structural change in the silicate network, while it did influence the phosphate environment due to its lower ionic field strength in comparison with that of magnesium.