An investigation is reported of the coating of ZnS by Y2O3 using a sol–gel process. Yttrium isopropoxide was used as the precursor material and was dissolved in a toluene/isopropanol solution. The solution was refluxed at an elevated temperature before the phosphors were added. The coated phosphors were then fired in air to convert the hydroxide to oxide. Scanning electron microscopy confirmed ...

Rare-earth doped Ca2SnO4 phosphors were synthesized using a conventional solid state reaction method. The red phosphorescence of Eu(3+) was observed in this system with persistence time. In the as-prepared samples, the doped rare earth ions occupied both Ca and Sn sites in the host lattice. The longest phosphorescent persistence property can be achieved for the Ca2SnO4 phosphors with a 0.1% Eu ...

Background: Camel and sheep have high disperse and tolerance in tropical regions. But different results of harsh condition tolerance ability of them have been reported. ObjectiveS: The objective of this study was to determine the heat stress tolerance in camel and sheep by evaluating changes in blood serum metabolites and to report and compare the serum biochemical profile of sheep and camel du...

We have synthesized nanoparticles of ZnS doped with Mn for potential use as cathodoluminescent phosphors in field-emission displays ~FEDs!. We show that the cathodoluminescent efficiency of particles <100 nm in diameter is within 40% of that of a commercial ~micron-sized! phosphor when the electron-beam energy ranges between 500 and 3500 eV. The nanoparticles exhibit less current saturation tha...

The e4ect of host compositions on the luminescent properties of spinel-type ZnGa2O4 phosphors was investigated by systematic substitution of Cd for Zn in the host lattice. A continuous solid solution with the composition (Zn12xCdx)Ga2O4 (04x41.0) was synthesized at 9503C as self-activated phosphors, as indicated by X-ray di4raction (XRD) analysis. With increasing substitution of Cd the emission...

While infrared upconversion imaging using halide nanoparticles are so common the search for a very efficient halide free upconverting phosphors is still lacking. In this article we report Gd2O2S:Yb/Er,YbHo,YbTm systems as a very efficient alternative phosphors that show upconversion efficiency comparable or even higher than existing halide phosphors. While the majority of rare earth dopants pro...

A unique approach for obtaining bright and efficient saturated green phosphors for alternating-current thin-film electroluminescent ~ACTFEL! device applications is presented. The approach involves color-shifting blue SrS:Cu,F ACTFEL phosphors into the green region of the spectrum via the incorporation of alkali metal ions into the SrS lattice. Alkali metals are incorporated into SrS:Cu,F phosph...

Phosphors, synthesized by the urea homo-precipitation method, were examined as UV-spectral down conversion materials for improving the light absorption and electrical characteristics of commercial single-junction silicon solar cells. The PV cells were coated with Erbium and Terbium doped Gadolinium Oxysulfide phosphors encapsulated in EVA binder using blade screen printing technique, and the op...

The most common phosphor in white LEDs is YAG:Ce; however, low radiant energy produced by this phosphor in the long wavelength (red) portion of the spectrum results in low color rendering (CRI) values, making the white LEDs less acceptable for general illumination. Mixing a suitable red phosphor with YAG:Ce improves CRI. Past studies have shown that when more than one phosphor is used in a conv...

An investigation of the photoluminescent properties and crystalline morphology of blue emitting LiBa1-xPO4:xTm3+ phosphors with various concentrations (x = 0.005-0.030) of Tm3+ ions were synthesized by microwave sintering. For comparison, the LiBa1-xPO4:xTm3+ powders sintered at the same sintering condition but in a conventional furnace were also investigated. LiBaPO₄ without second phase was f...