A5103028385- Luminescence Properties of Advanced Materials
- Glass properties and applications
- Solid State Laser Technologies
- ZnO doping and properties
- Electrochemical sensors and biosensors
- Silicon Nanostructures and Photoluminescence
- Forensic Fingerprint Detection Methods
- Nuclear materials and radiation effects
- Advanced biosensing and bioanalysis techniques
- Semiconductor materials and devices
- Ga2O3 and related materials
- Thin-Film Transistor Technologies
- Biometric Identification and Security
- Lanthanide and Transition Metal Complexes
- Electrochemical Analysis and Applications
- GaN-based semiconductor devices and materials
- Catalytic Processes in Materials Science
- Optical Coatings and Gratings
- Perovskite Materials and Applications
- Microwave Dielectric Ceramics Synthesis
- Mineralogy and Gemology Studies
- Photonic Crystals and Applications
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Material Dynamics and Properties
University of Sfax
2015-2024
Centre des Matériaux
2015
Centre National de la Recherche Scientifique
2013
Université Claude Bernard Lyon 1
2013
Laboratoire de Physique Théorique
2000-2010
Graphical representation of Li<sup>+</sup> co-doped Y<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>:Er<sup>3+</sup>/Yb<sup>3+</sup> phosphor showing up-conversion green and red bands probing the fluorescence intensity ratio (FIR) for temperature sensing applications.
In this work, we investigated the potential of Eu3+/Dy3+-codoped Y2Sn2O7 fluorescent nanophosphors to visualize latent fingermarks. We prepared these with various doping concentrations by conventional coprecipitation reaction. The crystal structure, morphology, luminescence properties, and energy transfer mechanisms were studied. crystalline phase was characterized X-ray diffraction structure refinement using Rietveld method. XRD measurements showed that samples crystallized in pure single...
The spectroscopic properties of Er3+ ion in tellurite glass molar composition 76TeO2∙10ZnO∙9.0PbO∙1.0PbF2∙3.0Na2O∙1.0Er2O3 was investigated experimentally. three phenomenological intensity parameters Ωk (k = 2, 4, 6) were determined from the absorption spectral intensities using Judd-Ofelt (J-O) theory. Several radiative such as spontaneous transition probabilities, fluorescence branching ratios and life times by these parameters. special attention attributed to visible emissions that could...
We synthesized Gd2O3 and doped by europium (Eu) (2% to 10%) nanoplatelets using the polyol chemical method. The were characterized X-ray diffraction (XRD), FESEM, TEM, EDX techniques. optical properties of investigated photoluminescence spectroscopy. also studied magnetic resonance imaging (MRI) contrast enhancement T1 relaxivity 3 T MRI. XRD for revealed a cubic crystalline structure. Gd2O3:Eu3+ highly consistent with indicating total incorporation Eu3+ ions in matrix. Eu doping produced...
Two-dimensional (2D) layered transition-metal dichalcogenides (2DMX2) are materials with unique optoelectronic properties, high surface-to-volume ratio, and carrier mobility. The combination of noble metal nanoparticles (MNPs) 2DMX2 opens new avenues in conceiving more efficient plasmonic sensors, allowing one to optimize both electromagnetic chemical signal enhancement. Photoinduced enhanced Raman spectroscopy (PIERS) exploits the electron migration from semiconductors MNPs, upon UV light...
Surface plasmon resonance sensors (SPR) using copper for sensitive parts are a competitive alternative to gold and silver. Copper oxide is semiconductor has non-toxic nature. The unavoidable presence of may be interest as it non-toxic, but modifies the condition performance sensor. Therefore, characterization optical properties thin films interest. We propose method recover both thicknesses from absorbance curves over (0.9;3.5) eV range, we use these results numerically investigate surface...
The thermal and optical properties of 60TeO2-20K2TeO3-10WO3-10Nb2O5 (in mol%) glasses doped with Ho2O3, Er2O3, Tm2O3 were explored in the present work. stability, refractive index n, extinction coefficient k, absorption α, band gap evaluated. UV–Vis–NIR spectra, Judd–Ofelt intensity parameter, spectroscopic quality factor, emission cross-sections calculated to investigate effects Er3+ Tm3+, respectively, on Ho3+ ions. results showed that maximum cross-section was approximately 8×10−21 cm2,...
A glass composition using TeO2-K2TeO3-Nb2O5-BaF2 co-doped with Er2O3/Ho2O3 and Er2O3/Yb2O3 was successfully fabricated. Its thermal stability physical parameters were studied, luminescence spectroscopy of the fabricated glasses conducted. The optical band gap, Eopt, decreased from 2.689 to 2.663 eV following substitution Ho2O3 Yb2O3. values refractive index, third-order nonlinear susceptibility (χ(3)), index (n2) estimated. Furthermore, Judd–Ofelt intensity Ωt (t=2,4,6), radiative properties...
Fitting optical properties of metals is great interest for numerical methods in electromagnetism, especially finite difference time domain (FDTD). However, this a tedious task given that theoretical models used usually fail to interlink perfectly with the experimental data. paper, we propose method fitting relative permittivity by sum Drude-Lorentz or partial-fraction models. We use particle swarm optimization (PSO) hybridized either Nelder-Mead downhill simplex, gradient method. The main...
Peralkaline Sm3+-doped aluminosilicate glasses with different network modifier ions (Mg2+, Ca2+, Sr2+, Ba2+, Zn2+) were investigated to clarify the effect of glass composition and structure on optical properties doped Sm3+ ions. For this purpose, luminescence emission spectra correlated molecular derived by dynamics (MD) simulations. The have a clear systematic peak area ratio peaks which correlates average rare earth site symmetry in glasses. highest is found for calcium glass. Glasses...