A5002052680- Radiation Detection and Scintillator Technologies
- Luminescence Properties of Advanced Materials
- Atomic and Subatomic Physics Research
- Advanced Semiconductor Detectors and Materials
- Silicon Carbide Semiconductor Technologies
- Solid State Laser Technologies
- Particle Detector Development and Performance
- Semiconductor materials and devices
- Nuclear Physics and Applications
- Radiation Effects in Electronics
- Semiconductor materials and interfaces
- Advanced Fiber Laser Technologies
- Medical Imaging Techniques and Applications
- Laser Design and Applications
- Perovskite Materials and Applications
- Photorefractive and Nonlinear Optics
- Diamond and Carbon-based Materials Research
- Advanced X-ray and CT Imaging
- Solid-state spectroscopy and crystallography
- Thin-Film Transistor Technologies
- Terahertz technology and applications
- Silicon and Solar Cell Technologies
- Advanced X-ray Imaging Techniques
- Ion-surface interactions and analysis
- Nuclear materials and radiation effects
Czech Academy of Sciences, Institute of Physics
2015-2024
Institute of Electrical Engineering of the Slovak Academy of Sciences
2012-2024
Slovak Academy of Sciences
2012-2024
Czech Academy of Sciences
2002-2023
Institute of Chemistry of the Slovak Academy of Sciences
2018-2021
Technical University of Košice
2001
High Energy Accelerator Research Organization
2000
Institute of Physics of the Slovak Academy of Sciences
1990
Institute of Physics
1988
Yale University
1961
Inorganic scintillators with high density and light yield are of major interest for applications in medical imaging energy physics detectors. In this work, the optical scintillation properties Mg co-doped Ce:Gd3Al2Ga3O12 crystals, grown using Czochralski technique, have been investigated compared ones prepared identical technology. Improvements timing performance samples respect to measured, namely a substantial shortening rise time decay components lower afterglow were achieved. particular,...
A Czochralski-grown single crystal of GAGG:Ce,Mg allows for a high Ce dopant and Mg codopant concentration in the crystal, resulting acceleration scintillation decay down to several nanoseconds at expense light yield.
Correlated measurements of emission spectra, photoluminescence and scintillation decays, thermoluminescence, light yield were performed on a selected set undoped La-doped PbWO4 single crystals. The samples grown from 5N purity raw powders show the blue component only. Distinct influence La doping was found in thermoluminescence characteristics. It is discussed direct suppressing creation point defect centers lattice, which are involved energy transfer storage processes this material.
A set of Eu-doped Y3Al5O12 (YAG) phosphors in the powder form was successfully synthesized by multiple-step solid-state reaction under reducing Ar:5%H2 atmosphere. Their physical properties were investigated means X-ray diffraction, time-resolved luminescence spectroscopy, and electron paramagnetic resonance (EPR). Special attention given to well-grounded confirmation Eu2+ occurrence YAG structure. diffraction confirmed presence a major phase all samples. The influence Eu concentration,...
Electron traps based on regular Pb sites perturbed by oxygen vacancies ${(V}_{\mathrm{O}})$ in high purity undoped ${\mathrm{PbWO}}_{4}$ have been revealed and studied electron spin resonance (ESR) thermally stimulated luminescence (TSL) measurements. Detailed analysis of ESR spectra parameters $(g$ factor, hyperfine, superhyperfine structures) along with the variation concentration after annealing inert atmospheres had shown that centers are ${\mathrm{Pb}}^{+}\ensuremath{-}{V}_{\mathrm{O}}$...
The effect of Nb codoping on the optical properties PbWO4:Mo scintillator is investigated by radio- and thermoluminescence, scintillation decay, light yield measurements. Steady-state radioluminescence efficiency PbWO4:Mo,Nb with optimized doping concentrations (2750 350 molar ppm, respectively) becomes up to 20 times higher respect that undoped PbWO4 comparable Bi3Ge4O12. However, slow components down several tens microseconds appear in time decay. Their existence may be related presence...
The influence of co-doping Gd3Al2GA3O12:Ce (GAGG:Ce) scintillator with magnesium on the rise time luminescence response was studied in two GAGG:Ce crystals grown nominally identical conditions except Mg one them. Time-resolved photoluminescence spectroscopy and free carrier absorption techniques were exploited. It is evidenced that decreases down to sub-picosecond domain. Meanwhile, light yield by ∼20%. Thus, feasibility exploitation fast edge for ultrafast timing scintillation detectors...
For the first time, photoluminescence of PbWO 4 :Bi crystals with different bismuth contents is studied by time‐resolved spectroscopy methods at 4.2–300 K. Photo‐thermally stimulated processes electron and hole centers creation under selective UV irradiation crystal in 3–5 eV energy range 4.2–200 K temperature are clarified, optically created identified thermally luminescence spin resonance methods. The 2.2 emission crystals, excited Bi 3+ ‐related absorption band overlapped exciton band,...
Free-electron lasers (FELs) have invigorated physics research, but novel sources require means of beam characterization as an integral part any experiment. In this study, desorption imprints in plastic yield transverse intensity profiles x-ray FEL beam, from which the authors recover complex electric-field profile and coherence properties focused beam. This approach will inform not only experiments coherent diffraction imaging, microscopy, high-energy-density physics, also development...
In this work we have focused on detection of thermal neutrons generated by 239Pu–Be isotopic neutron source. A high quality liquid phase epitaxial layer 4H-SiC was used as a region. The thickness the 70 μ m and diameter circular Au/Ni Schottky contact 4.5 mm. Around two guard rings were created. detector structure first examined protons alpha particles for energy calibration. Monoenergetic energies from 300 keV up to 1.9 MeV calibration good linearity observed. resolution 35 obtained...
Detail spectroscopy study of erbium-doped active media is crucial for understanding the behavior erbium-based lasers. In this paper, first time, detailed concentration dependence Er3+ in garnet-based presented. Wide range novel samples Er:GGAG (26 total) with various (0.5–38 at%), were investigated time. The complete (absorption and emission cross-section, Raman, mid- far-infrared transmission spectra, decay times at 4I11∕2 4I13∕2) together Judd-Ofelt analysis laser characteristics measured...
We present correlated measurements of radioluminescence, photoluminescence, and thermoluminescence, as well the decay kinetics both under ultraviolet Na(51122 keV) photon excitations for Mo-doped doubly (Mo,Y)-doped PbWO4 single crystals. A wide concentration range Mo doping (200–50 000 ppm) is covered. Y codoping results in significant suppression trapping states induced by doping. Consequently, an improvement temporal characteristics, such acceleration scintillation process, doped material...
X-ray excited luminescence spectra, wavelength-resolved thermoluminescence glow curves, ultraviolet and 22Na emission decays, 60Co light yield were measured on a set of high purity (99.9999%) PbWO4:X (X=Lu3+, Y3+, Gd3+, Sc3+, Nb5+, Pb2+) samples grown in an equivalent way. Positive influence trivalent doping (Lu, Gd, Y) was noted, which consists suppressing the deeper trapping states PbWO4 structure. Such are related to radiative recombination processes green red part spectra. The presence...