Investigation of red-emitting CaMoO: Eu phosphor by partitioning of substitutional PO ions via solid-state reaction method.

To investigate the impact of PO anionic groups, the trivalent europium ion-doped calcium molybdate (CaMoO-PO:xEu, where x = 0.5, 1.0, 1.

Unexpected Roles of Interstitially Doped Lithium in Blue and Green Light Emitting YO:Bi: A Combined Experimental and Computational Study.

To enhance the photoluminescence of lanthanide oxide, a clear understanding of its defect chemistry is necessary. In particular, when yttrium oxide, a widely used phosphor, undergoes doping, several of its atomic structures may be coupled with point defects that are difficult to understand through experimental results alone. Here, we report the strong enhancement of the photoluminescence (PL) of YO:Bi via codoping with Li ions and suggest a plausible mechanism for that enhancement using both experimental and computational studies.

Ultra-sensitive and selective NH room temperature gas sensing induced by manganese-doped titanium dioxide nanoparticles.

The study of the fabrication of ultra-high sensitive and selective room temperature ammonia (NH) and nitrogen dioxide (NO) gas sensors remains an important scientific challenge in the gas sensing field. This is motivated by their harmful impact on the human health and environment. Therefore, herein, we report for the first time on the gas sensing properties of TiO nanoparticles doped with various concentrations of manganese (Mn) (1.

Structural, optical and photoluminescence properties of Eu doped ZnO nanoparticles.

The structure, particle morphology and luminescent properties of europium (Eu) doped ZnO nanoparticles (NPs) prepared by co-precipitation method are discussed. When excited using a 325nm He-Cd laser, undoped ZnO NPs exhibited weakly the well-known ultraviolet excitonic recombination emission (at ~384nm) and strongly broad band visible emissions associated with defects (at ~600nm). In addition, the ZnO NPs exhibited green emission at ~600nm associated with defects when excited using a monochromatized xenon lamp.

Tunable emission from LiBaBO :Eu ;Bi phosphor for solid-state lighting.

Europium (Eu ) and bismuth (Bi ) co-activated LiBaBO powder phosphors were synthesized by a solid-state reaction and the structure, particle morphology, optical and photoluminescent properties were investigated. X-Ray diffraction patterns of the LiBaBO phosphors crystallized in a pure monoclinic phase, i.e.

Up-conversion luminescence in Yb(3+)-Er(3+)Tm(3+) co-doped Al(2)O(3)-TiO(2) nano-composites.

The sol gel method was used to prepare rare-earths (Yb-Er and Yb-Tm) co-doped AlO-TiO nano-composite powder phosphors and their up-conversion luminescence properties were investigated. Mixed oxides of titania (TiO) rutile phase and an early stage crystallization of alumina (AlO) phase were confirmed from the X-ray diffraction data with the average crystallite size of ∼36nm. The rutile phase TiO was further confirmed by selected area diffraction analysis of the composites.

Deep level defect correlated emission and Si diffusion in ZnO:Tb(3+) thin films prepared by pulsed laser deposition.

Terbium (Tb(3+)) doped zinc oxide (ZnO) or (ZnO:Tb(3+)) thin films were grown on silicon substrates by the pulsed laser deposition technique at different growth temperatures that were varied from room temperature (RT) to 400°C. The effects of substrate temperature on the structural and optical properties of the ZnO:Tb(3+) films were investigated by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and RT photoluminescence spectroscopy. The band to band and deep level defect emissions were observed for all substrate temperatures.

Effects of thermal treatment and depth profiling analysis of solution processed bulk-heterojunction organic photovoltaic cells.

We report the use of solution processed zinc oxide (ZnO) nanoparticles as a buffer layer inserted between the top metal electrode and the photo-active layer in bulk-heterojunction (BHJ) organic solar cell (OSC) devices. The photovoltaic properties were compared for devices annealed before (Device A) or after (Device B) the deposition of the Al top electrode. The post-annealing treatment was shown to improve the power conversion efficiency up to 2.