In the present work, the Europium doped Zinc Oxide thin films were elaborated using spray pyrolysis technique. We are interested in investigating the structural properties, photoluminescence (PL) and third harmonic generation (THG) of the elaborated films. The structural properties of as-prepared thin films were characterized by X-ray diffraction (XRD). It confirms that all deposited thin films of Europium doped Zinc Oxide are crystallized in the hexagonal wurtzite structure. Both undoped and doped europium thin films show strong preferred c-axis orientation. Photoluminescence (PL) emission from Europium doped Zinc Oxide thin films, under excitation by 266 nm, shows characteristic transitions of Europium (5D0→7F0, 5D0→7F1, 5D0→7F2, …). It reveals the good incorporation of Eu3+ ions in the ZnO host. Additionally, the 5D07F2 is the most intense transition usually observed for Eu3+ embedded in materials of Zinc Oxide lattice. The dependence of third-order nonlinear susceptibility on doping rate was evaluated. The highest nonlinear susceptibility χ3 is obtained for the 5% Europium doped ZnO sample.

In the presented study, (Ni, Mg) co-doped CdS thin films are synthetized using the spin coating method. The Mg incorporation effect on the structural, opto-electrical quality of Cd0.98Ni0.02S with different Mg concentrations (0 wt%, 1wt.%, 3wt, and 5wt.%) are investigated. A polycrystalline nature with a cubic structure oriented to (1 1 1) plane was confirmed by the DRX technique, and the incorporation of Mg in Cd0.98Ni0.02S causes an increase of the grain size. The SEM study exhibits a surface of deposited films is dense and the EDS spectra confirmed the existence of the doped elements. The optical properties show that the doping with 3 at.% of Mg presents the maximum each a value of 90% in visible range, with an increasing in the gap energy from 2.42 eV to 2.49 eV corresponding to increasing of Mg concentration. And also optical parameters were investigated such as α, k, n, ε r, ε i, tan δ, σ. The electrical resistivity and conductivity measurements are carried using the four points probe, we find that the electrical resistivity decreases from the 7.30 × 103 (Ohm. cm) to 4.28 × 103 (Ohm. cm) while Mg concentration increases from 0 at% to 5 at%.

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