BaFBr doped with Eu2+ is the most successful X-ray storage phosphor used for digital radiography so far. The mechanisms of information and subsequent read-out are, however, not yet fully understood. present understanding structures reactions radiation-induced point defects involved in these processes are critically discussed. shortcomings screens based on BaFBr:Eu2+ inferior spatial resolution compared to conventional films. Also reviewed therefore alternative phosphors such as alkali...

We report the synthesis of Eu2+- and chlorine-doped fluorozirconate glass-ceramics that show an intense photostimulated luminescence (PSL) after x-ray irradiation at room temperature. The PSL efficiency is up to 80% found in well-known crystalline storage phosphor BaFBr:Eu2+, it largest thus far reported for a glass-ceramic. attribute crystallites orthorhombic BaCl2 are formed annealing above glass Hexagonal also observed short times, but they do not provide measurable signal....

Rare-earth-doped fluorochlorozirconate (FCZ) glass-ceramic materials have been developed as scintillators and their properties investigated a function of dopant level. The paper presents the relative scintillation efficiency in comparison to single-crystal cadmium tungstate, intensity x-ray energy, spatial resolution (modulation transfer function). Images obtained with FCZ scintillator tungstate are also presented. Comparison shows that image quality using glass ceramic is close from...

We report the results from a study of europium-doped fluorochlorozirconate glasses that have been thermally processed to induce nucleation and crystallization BaCl2 crystallites. The resulting glass ceramics show photostimulated luminescence (PSL) effect with conversion efficiency which is up 80% found in commercial crystalline x-ray storage phosphor material BaFBr:Eu2+. Thermal processing for 20 min range 240–260 °C produces small (∼6–11nm) hexagonal crystallites, while temperatures 270–290...

Single crystals of undoped or europium-doped barium chloride, bromide, and iodide were investigated under x-ray γ-ray excitations. The Eu2+-related excited luminescence found in the Eu-doped halides occurs at 402, 404, 425nm for iodide, respectively. BaCl2:Eu2+ shows best scintillation properties systems investigated. light yield is about 20000±2000photonsperMeV absorbed energy, energy resolution 662keV photopeak 8.8%±0.9%, decay time 390±40ns.

Abstract Thermal processing of as‐made fluorozirconate glasses which were additionally doped with neodymium and chlorine ions leads to enhanced upconversion fluorescence intensities. The samples annealed between 240 °C 290 the optimum value intensity was found for 270 sample. development Er, whose luminescence characteristics make it a better choice application as an layer on silicon solar cells, is in progress. In addition, we present external quantum efficiency measurements cell NaYF 4 :Er...

Scattering luminescent materials dispersed in liquid and solid matrices powders are increasingly relevant for fundamental research industry. Examples nano- microparticles phosphors of different compositions various or incorporated into ceramics with applications energy conversion, solid-state lighting, medical diagnostics, security barcoding. The key parameter to characterize the performance these is photoluminescence/fluorescence quantum yield (Φ

We found enhanced upconverted fluorescence in Nd3+-doped fluorozirconate glasses which were additionally doped with chlorine ions. Upon annealing between 240 and 290°C, hexagonal phase BaCl2 nanocrystals 20 180nm diameter formed the glass. During thermal processing, some of Nd3+ ions enter leading to additional splitting infrared spectra increased intensities. The optimum value was for 270°C sample where intensity is approximately a factor 60 stronger than one as-made

In recent investigations using various analysis methods it has been shown that mechanical or thermal loading of PV modules leads to stress in the module parts and especially encapsulated solar cells. Cracks crystalline cells are a characteristic defect is caused by stress. They can lead efficiency losses lifetime reduction modules. This paper presents two experiments for systematic investigation crack initiation growth under electroluminescence. For this purpose laminated test specimens on...

A novel method for the synthesis of luminescent SiO(2)/calcium phosphate (CaP):Eu(3+) core-shell nanoparticles (NPs) was developed via a sol-gel route followed by annealing at temperature 800 °C. The object this study investigation effect pH on formation CaP shell around silica core. resulting annealed NPs exhibited an amorphous SiO(2) core and crystalline shell. layer possible below 4.5 above 6.5 during coating step. crystal structure studied X-ray diffraction analysis. Hydroxyapatite (HAp)...

Transparent conductive oxide (TCO) thin films were removed from glass substrates using femtosecond laser pulses. Irradiating through the glass, threshold for complete TCO ablation was much lower than front-side irradiation. Additionally, former method created almost rectangular cross-sectional groove profiles despite Gaussian beam. This indicates a non-thermal ultrafast mechanism via critical carrier concentration achieved by pulse in at interface. Very narrow scribes of only 5 μm width...

We developed translucent glass‐ceramic image plates for digital mammography. The glass ceramics are based on europium‐doped fluorozirconate glasses, which were additionally doped with chlorine to initiate the nucleation of barium chloride nanoparticles therein. X‐ray is stored in form stable electron–hole pairs, can be read out afterwards a scanning laser beam “photostimulated luminescence” (PSL) process. Measurements required stimulating exposure, integrated PSL signal, and optical light...

Lock-in infrared thermography is a well-established technique for measuring the thermal diffusivity of materials. A commonly-used method to analyse spread wave along surface thin sample or filament, known as slope method. In this work, an alternative proposed, in which phase delay passing through sheets made different metals analysed using periodical laser heating. Different lock-in frequencies are used obtain frequency-dependent behaviour waves generated by pulses. subsequent curve fitting...

In this work, single- and double-doped Dy3+ Tb3+ barium borate glasses are investigated for their potential as light converters. The density the absorption coefficient show linearly increasing trends with an lanthanide content. external quantum efficiency of samples is a combination respective single-doped samples. strong energy transfer from to results in intense Tb3+-related emission, i.e., green luminescence. Thus, excitation at Dy3+-related wavelength 452 nm enables which sample barely...

Photostimulated luminescence at room temperature was observed in a fluorozirconate glass which doped with 1% Eu2+ or Ce3+ and 5% Br− ions. Small crystals of BaBr2 (high-pressure phase) form the on cooling. The spectra comprised two emission lines each: for one line 413 nm broader band centered 485 nm, 320 425 nm. is attributed to 5d14fn−1→4fn emissions rare earth In both cases only bands showed photostimulated luminescence. stimulation ions 570