A5004344828- Luminescence Properties of Advanced Materials
- Solid-state spectroscopy and crystallography
- Glass properties and applications
- Chalcogenide Semiconductor Thin Films
- Radiation Detection and Scintillator Technologies
- Optical and Acousto-Optic Technologies
- Solid State Laser Technologies
- Spectroscopy and Quantum Chemical Studies
- Inorganic Fluorides and Related Compounds
- Quantum Dots Synthesis And Properties
- Advanced Chemical Sensor Technologies
- Photorefractive and Nonlinear Optics
- bioluminescence and chemiluminescence research
- Nuclear materials and radiation effects
- High-Energy Particle Collisions Research
- Photochemistry and Electron Transfer Studies
- Acoustic Wave Resonator Technologies
- Electrochemical Analysis and Applications
- Gas Sensing Nanomaterials and Sensors
- Advanced Thermodynamics and Statistical Mechanics
- Crystal Structures and Properties
- Nonlinear Optical Materials Research
- Infrared Target Detection Methodologies
- Lipid Membrane Structure and Behavior
- Earthquake Detection and Analysis
L. N. Gumilyov Eurasian National University
2015-2025
Institute of Physics and Technology
2013
Karagandy State University
2001-2002
The luminescence properties of BaMgF4 ceramics synthesized using electron beam-assisted synthesis were investigated under vacuum ultraviolet (VUV) synchrotron excitation at a cryogenic temperature T = 9 K. Their spectra, measured over the 4–10.8 eV range, and corresponding spectra revealed complex multicomponent structure with emission maxima 3.71, 3.55, 3.33, 3, ~2.8 eV. primary band 330 nm was attributed to self-trapped excitons (STE) excited near edge (9.3–9.7 eV), indicating interband...
The synthesis of β-Ga2O3 ceramic was achieved using high-energy electron beams for the first time. irradiation gallium oxide powder in a copper crucible 1.4 MeV beam resulted monolithic structure, eliminating particles and imperfections. synthesized exhibited close-to-ideal composition O/Ga 3:2 ratio. X-ray diffraction analysis confirmed monoclinic structure (space group C2/m) that matched reference diagram before after annealing. Photoluminescence spectra revealed multiple luminescence...
In this work, we present the results of structure and luminescence properties YAG:Ce (Y3Al5O12 doped with Ce3+ ions) ceramic samples. Their synthesis was carried out by sintering samples from initial oxide powders under powerful action a high-energy electron beam an energy 1.4 MeV power density 22-25 kW/cm2. The measured diffraction patterns synthesized ceramics are in good agreement standard for YAG. Luminescence characteristics at stationary/time-resolved regimes were studied. It is shown...
Synthesis in the radiation field is a promising direction for development of materials transformation processes, especially those differing melting temperature. It has been established that synthesis yttrium-aluminum ceramics from yttrium oxides and aluminum metals region powerful high-energy electron flux realized 1 s, without any manifestations facilitate synthesis, with high productivity. assumed rate efficiency are due to processes formation radicals, short-lived defects formed during...
Spectroscopic methods are used to study the processes of accumulation electron and hole trapping centers energy transfer electronic excitations impurities in CaSO4-Mn BaSO4-Mn. It is shown that from host occurs at moment charge excited anionic complex SO_4^(2-) hybrid radiative states 2.95–3.1 eV formed Mn^(+)-SO_4^(-) SO_4^(3-)-SO_4^(-) centers. was found that, sulfates, under irradiation, as a result complexes Tl^(+),Cu^(+),Mn^(2+), emerge 2.95–3.15 eV, occupying same...
Using synchrotron radiation, a comparative VUV excitation study of YAG ceramics doped with Eu3+ and Cr3+ ions under (10.5–3.7 eV) at 9 K was conducted in this work. Both exhibit distinct peaks the region, indicating high-energy transitions related to internal electronic levels dopants interband within matrix. For YAG:Eu, main 6–7 eV correspond 4f-shell Eu3+-O2− charge transfer states, showing weak dependence on crystal field high energy conversion efficiency. In contrast, YAG:Cr shows broad...
Spectroscopic and thermoactivation methods were used to study the processes of accumulation electron hole trapping centers energy transfer electronic excitations impurities in CaSO4-Mn BaSO4-Mn. It is shown that are created during excitation an anionic complex as a result charge from O2−→SO42− closely spaced complexes SO42− CaSO4 BaSO4. In BaSO4, host occurs at moment excited combined radiative state 2.95–3.1 eV. This formed Mn+-SO4− SO43−-SO4−. was found emerging states eV sulfates, which...
The mechanisms of creation impurity and intrinsic electron-hole trapping centers in Na2SO4 − Cu crystals have been investigated by spectroscopic methods. It is shown that the crystal lattice are created same energy distances approximately 3.87-4.0 eV 4.43-4.5 eV. During annealing centers, recombination processes transferred to impurities.
Ceramics based on alkaline earth metal fluorides activated by tungsten has been obtained radiation synthesis. The synthesis was realized direct action the mixture with an activator of a powerful flow high-energy electrons without use any additives to facilitate It established that resulting ceramics have luminescent properties characteristic tungsten-activated materials fluorides.
The Na 2 SO 4 samples were obtained by slow evaporation method. mechanisms of the formation electron and hole trapping centers are investigated spectroscopic methods. Intrinsic recombination emission 2.9–3.1 eV impurity 1.85 excited at 4.0–4.5 eV. 3− −SO − Mn + revealed. local levels corresponding between center decay intrinsic was recorded temperatures 130–150 K 280–350 K.
The quality of synthesized materials is affected by various factors such as the prehistory substances used and synthesis technology. Most methods for synthesizing luminescent ceramics based on metal oxides rely high-temperature heating to facilitate necessary exchange elements between precursor particles. However, a promising alternative method involves direct application powerful high-energy radiation flux, which stimulates different processes. formation through this occurs in highly...
This study delves into the synthesis and characterization of luminescent ceramics based on tungstenactivated magnesium fluoride (MgF 2 ) complemented with varying concentrations lithium hydroxide (LiOH). Utilizing a distinctive sintering process conducted in an open-air milieu under robust radiation conditions, we successfully synthesized series tungsten-activated ceramics. Study revealed that resultant prominently display properties, which can be excited by UV spectrum 200-300 nm, as well...
The methods of vacuum ultraviolet and thermal activation spectroscopy were used to measure the excitation spectra impurity radiation in fundamental absorption band K 2 SO 4 -Cu crystals at 15 300 K. An energy transfer was detected from base Cu + impurities. gap estimated. In crystals, recombination bands 2.95 ÷ 3.0 eV corresponding electron hole capture centers.