This study has investigated the effect of dopant concentration on the luminescent emission of Er in ZrO2 nanocrystals. The structure and morphology of the resulting nanocrystals were characterized by X-ray diffraction and field emission scanning electron microscope. The room-temperature optical properties of synthesized nanocrystals were studied by photoluminescence spectroscopy. The dependence...

Hexagonal GdF3 is a more efficient phosphor host compared with the traditional orthorhombic form but the hexagonal phase is thermodynamically unstable at room temperature. Herein, we present a strategy to stabilize hexagonal GdF3 by doping with alkaline-earth ions in a mild hydrothermal reaction system. The selection of the dopant, effect of the dopant amount and the mechanism of the phase tran...

Radiative relaxations of electronic excitations - self-trapped excitons (STE) in regular lattice sites (intrinsic luminescence) and exciton-like formations (ELF) the field homologous cations (exciton-like luminescence). It has been found that maximum effect luminescence enhancement occurs upon uniaxial deformation along <110> crystallographic direction (compared to <100>), which coi...

The optical technique based on the measurement of delayed luminescence emitted from the biological samples has demonstrated its ability to provide valid and predictive information on the functional status of various biological systems. We want to extend this technique to study the effect of ionizing radiation on biological systems. In particular we are interested in the action of ion beams, use...

We show that near-surface defects produced by mechanical treatments and electron irradiation can significantly enhance the intensity of luminescence due to the decay of self-trapped excitons sSTEsd in single-crystal calcium fluoride during 157and 193-nm irradiation. For example, polishing can double the intensity of the STE luminescence. Defects produced by mechanical indentation can either inc...

PRINCIPLES OF LUMINESCENCE MICROSCOPY ................................•..........•...........•............ 273 Photometric Features of a Luminescence Microscope ............................................... 273 Performance Criteria................................................................................................ 276 Practical Considerations ................................. .......

Fluorescence/phosphorescence (referred in this article simply as luminescence) based-detections arguably are the most widely used detection technique for biological assays, imaging, and sensing. This is primarily due to its high detection sensitivity and the commercial availability of a large number of fluorescence probes [1-3]. Key to the usefulness of luminescence methods is the ability to se...

Effect of the pump power on photoluminescence intensity for dislocation-related luminescence centers is studied in p-type silicon containing oxygen precipitates. Oxygen precipitates are induced as a result three-stage annealing used formation getter fast diffusing impurities microelectronics technology while D1 and D2 were produced during subsequent flow argon at 1000 o C. The excitation effici...