Hani Boubekri

Title : Photoluminescence properties of RE ions (Tb3+, Ho3+, Er3+, Eu3+) doped CdF2 single crystal

Abstract:

This paper reports the photoluminescence properties of RE ions (Tb³⁺ Ho³⁺ Er³⁺ Eu³⁺ ) doped CdF₂ single crystal . In recent years, rare earths (RE) doped host matrix have been studied extensively due to their potential applications in green technology. They have an important role in the development of optical systems, cathode ray tubes, clean energy, postings 3D, infrared radiation detection, color display, medical applications, sensors, optical data storage, plasma display panels (PDP), optoelectronic devices, biological fluorescence labeling, laser technology, luminescent paints and inks for security [1-5]. They have been reported in various fields due to the electronic and optical characters arising from the 4f electrons of lanthanide adding to the stability of chemical and physical properties of inorganic host matrices [6-7]. Among many solid-hosts materials studied so far, MF₂ difluoride crystals (M = Alkaline earth element, Cd or Pb) with fluorite type structure are of great interest as material for photonics. This choice refers to the low phonon frequency of such materials leading to a large number of potential emitting levels by limiting the non-radiative emissions. CdF₂ crystals occupy a specific place among MF₂ crystals. They are transparent in the UV, visible and near infrared (NIR) electromagnetic domain. CdF₂ is used as a main constituent of many fluoride glasses, material for laser, infrared detectors and medium for optical information processing systems [8-10]. The Judd-Ofelt (JO) theory has long been considered to be one of the most successful theories in estimating the magnitude of the forced electric dipole transitions of rare earth ions. The standard JO analysis is applied to the room temperature absorption intensities of RE³⁺ to determine the optical intensity parameters extremely depending on the rare earth ion and its local environment. The accurate values of these parameters are necessary to characterize the spectroscopic and laser properties of host matrix.

Key words: CdF₂, Lasers, Judd–Ofelt theory, Photoluminescence.

Biography:

Hani Boubekri was born in Algeria 1977. He is  Research Professor in Physics (Radiation-Matter Interaction) and Head of physics and chemistry department  in Higher Normal School of Technological Education (ENSET) Skikda Since 2013.   He was Research Associate at Nuclear Research Center of Algiers (CRNA) in Nuclear Techniques Division (TND) - Laser Laboratory.  He is interested on the synthesis and characterization of materials doped with rare earth ions (single crystals, glasses, nanoparticles and thin layer films), including the spectroscopic study of luminescence and the coherence properties of electronic transitions at different temperatures fo application in stable lasers, phosphors, scintillators and in other applications. He has been engaged in the studies of spectroscopic properties of the single crystals types (MF2, M= Ca, Ba; Sr Cd..) doped with ions luminescent Er, Tm, Tb and Eu  in collaboration with Department of Physics "Enrico Fermi", University of Pisa Italia , Vinča Nuclear Research Institute – Serbia and the National School of Chemistry of Paris (ENSCP, CNRS - Chemistry Paris-Tech) –France .