A5042811469- Luminescence Properties of Advanced Materials
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Inorganic Fluorides and Related Compounds
- Nuclear Physics and Applications
- Solid-state spectroscopy and crystallography
- Laser Material Processing Techniques
- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- X-ray Diffraction in Crystallography
- Laser Design and Applications
- Perovskite Materials and Applications
- Nuclear materials and radiation effects
- Laser-induced spectroscopy and plasma
- Semiconductor materials and devices
- Electron and X-Ray Spectroscopy Techniques
- Medical Imaging Techniques and Applications
- Glass properties and applications
- Optical and Acousto-Optic Technologies
- Ion-surface interactions and analysis
- Ga2O3 and related materials
- Atmospheric Ozone and Climate
- Crystallization and Solubility Studies
- Diamond and Carbon-based Materials Research
- Photorefractive and Nonlinear Optics
Centre National de la Recherche Scientifique
2013-2023
Centre Lasers Intenses et Applications
2002-2023
Université de Bordeaux
2001-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
1999-2023
Université Claude Bernard Lyon 1
2010-2019
Institut Lumière Matière
2013-2018
Bipar
2014-2015
Forum Réfugiés - Cosi
2015
Clinique Claude-Bernard
2012
Lomonosov Moscow State University
1993-2004
The materials community in both science and industry use crystallographic data models on a daily basis to visualize, explain predict the behavior of chemicals materials. Access reliable information structure crystalline helps researchers concentrate experimental work directions that optimize discovery process. Inorganic Crystal Structure Database (ICSD) is comprehensive collection more than 60,000 crystal entries for inorganic produced cooperatively by Fachinformationszentrum Karlsruhe...
Analysis of the last years theoretical studies and track simulations to conclusion that primary stages (electron scattering e-h thermalization) play key role in following scintillator efficiency. The long thermalization length comparing Onsager radius is main reason for geminate pair concentration decrease later luminescence losses. easiest way scintillation crystal doping or even transfer mixed crystals (solid solution). simple model modification electrons pairs proposed. It shown solid...
To evaluate the efficiency of photodynamic effect induced by X-rays, we quantified fraction energy deposited in nanoscintillators after interactions with X or γ-rays, introducing <italic>η</italic><sub>nano</sub> as a new loss parameter.
Absorption, reflection as well luminescence emission, excitation, and decay curves for single crystals of grown by the Bridgman technique have been measured at various temperatures. The fluorescence spectra photo-excited over a wide energy domain ranging from UV to x-ray region, kinetics are typical cerium praseodymium ions. These experimental results show that exciton transfer dopant occurs around 8 eV, via sequential hole electron trapping is dominant higher energy. This process must be...
This contribution is a review of the luminescence and scintillation properties nanoparticles (NP), particularly doped insulators. Luminescence spectroscopy an appropriate tool to probe matter at nanoscale. also last stage process. Specific surface structural effects occurring in NP are reported. Their consequences on discussed. Parts related preparation method. On other hand some intrinsic nanostructures which can modify optical described: quantum confinement dielectric confinement. The...
We investigate the origin of band at 3.31 eV (A band) commonly observed in emission spectra various ZnO samples. This is prime importance for confirmation $p$ doping nanostructures. check validity three main hypotheses generally evoked to explain it undoped ZnO, namely, surface states, 1LO phonon replica free exciton and a defect-related transition. Using samples structured different scales, from macro nano through meso (i.e., single crystal, nanoparticles assembly, microcrystalline pellet),...
A full concentration range of Lu2xGd2–2xSiO5 (LGSO:Ce) crystals was grown by the Czochralski method. Dependence scintillation properties on composition (x) in solid solutions is established. It determined that LGSO:Ce yield increases 0.3 < x 0.8 and reaches 29000 phot/MeV at 60% Lu host (x = 0.6), energy resolution improves up to 6.7% 662 KeV. The observed light increase, surprisingly high Ce3+ segregation coefficients, improvement resolution, suppression afterglow can be attributed...
The role of charge carrier trapping in determining radioluminescence (RL) efficiency increase during prolonged irradiation scintillators has been studied by using YPO4:Ce,Nd as a model material. Nd3+ ions act efficient electron traps minimizing the intrinsic defects. Different Nd contents were considered order to point out correlation between trap concentration and detected RL dose dependence. measurements function temperature clarified thermal stability shape magnitude such effect. We...
Exciton-exciton interaction is experimentally revealed and quantitatively analyzed in a wide band-gap scintillator material ${\text{CdWO}}_{4}$. Under high-intensity femtosecond vacuum ultraviolet excitation, the ${\text{CdWO}}_{4}$ luminescence quenched, while its decay becomes essentially nonexponential. We propose an analytical model, which successfully reproduces kinetics recorded range of excitation densities. The dipole-dipole between excitons leading to their nonradiative shown be...
The behavior of light yield in a wide range inorganic scintillation crystals formed by isovalent substitution anions or cations was investigated. correlation between improvement mixed crystals, and the ratios volumes occupied competing atoms (ions) has been analyzed. A phenomenological approach to prediction allows us predict optimal combination mixing components reach best performance. Relation rate light‐yield ratio substituted atoms.
A model of energy relaxation in alkali halide scintillators doped with Tl-like activators is presented. Interaction between thermalized charge carriers, their diffusion, and capture by traps are considered. The suggested the work includes essential electron excited states halides activators. Self-trapping holes occurs at LNT, giving rise to creation self-trapped excitons (STEs). Thallium-like activator impurity can act both as an or a hole trap. Once carriers trapped dopant, recombination...
LuAP:Ce and mixed LuYAP:Ce crystals are the promoted scintillation materials for positron emission tomography. These scintillators presently being studied in three directions: 1) growth of large with stable properties; 2) establishment relationships between composition 3) mechanisms lutetium compounds. We performed first bunch 16 size detector module (2/spl times/2/spl times/10 mm/sup 3/). The show good correlation among parameters, light yield, transmission spectra. To clarify mechanism...
A series of anhydrous cerium(III) trifluoroacetate complexes with neutral O-donor ligands, namely Ce2(OAc)(TFA)5(DMF)3 (1), Ce(TFA)3(L)x [x = 2, L THF (2), DMF (3), DMSO (4); x 1, diglyme (5)] and Ce2(TFA)6(DMSO)x(DMF)y 6, y 0 (6); 4, 2 (7)] (where OAc acetate, TFA trifluoroacetate, tetrahydrofuran, dimethylformamide, dimethylsulphoxide, MeO(C2H4O)2Me] were synthesized completely characterized by elemental analysis, FT-IR spectroscopy TG-DTA-MS studies. partially hydrated complex...
We report estimations of the thermalization length and diffusion coefficient photogenerated carriers in insulator LiYF4 as a function their initial energy. Combining modeling electron–phonon interaction detailed analysis kinetic response fluorescent center Ce3+ under vacuum ultraviolet excitation, is obtained energy electron. This parameter essential for description carrier recombination case nonideal plasma conditions, where electrons holes are strongly correlated. approach also...
A type of intrinsic luminescence in crystals has been revealed. The excitation threshold well-known fast CsI (300 nm band) obtained from the spectrum measured photon-energy range 5--125 eV at 300 K using synchrotron radiation. starts an energy about 20 and exponentially increases up to 4d ${\mathrm{I}}^{\mathrm{\ensuremath{-}}}$ ionization (\ensuremath{\sim}50 eV). Such high-energy broad is not typical for any conventional mechanisms excitation. We attribute this emission center, which...