Résumé: The present work focuses on the spectroscopic luminescence analysis of trivalent neodymium-doped lithium antimony-borate glasses, with the glass composition 70 Sb2O3—(25-x) B2O3–5li2O—xNd2O3 where x = 0.3; 0.5; 0.7 mol% (SBLN). Around 475 nm excitation used by the transition 4I9/2 → 2G9/2 + 2D3/2 + 2K15/2 and that induced emission lines of wavelengths λemis = 584;673;767;826 nm (red is low intensity). The specific emission follows the transitions 2G7/2 + 4G5/2 → 4IJ (J = 9/2; 11/2; 13/2; 15/2). Previous work on Nd3+ doped glasses studied near-infrared emission in 4F3/2 → 4IJ mode (J = 9/2; 11/2; 13/2) via near infrared excitation 4I9/2 → 4F5/ 2+2H9/2. The Judd-Ofelt analysis applied to SBLN glasses showed that the ΩK parameters are consistent with the values in the literature. SBLN7 glass has the best spectroscopic factor Ω4/Ω6 = 0.974; while the best luminescence branching ratio is that of the green emission and it stands at an average β = 70%. Similarly, green emission has the best values of stimulated emission cross section and gain bandwidth. Calculated and measured lifetimes are ranged between 15 and 40 microseconds; however, quantum efficiency varies between 50 and 91%. In another side calculated and measured refractive index values are very close. The chromatic coordinates of observed green color showed accurately that lies in the yellowish-green region of the chromaticity diagram edited by CIE 1931. The calculation of its temperature was made by Mc Macy’s equation, and it is in the limits of 5100 K; which corresponds to a cool color similar to midday sunlight.

Résumé: This study was aimed to implement response surface methodology to optimize the hydrodistillation parameters of the essential oil of the plant species Eucalyptus camaldulensis (RSM). The distillation time, condensation flow rate, and particle size were the desired parameters. To generate factor combinations, a three-factor Box-Behnken design was used. The response surface analysis yielded a linear model, which was used to calculate the top yield of extracted oil based on the optimized conditions. ANOVA shows that the generated polynomial model was highly noteworthy, with R2=0.861. The peak yield was 0.513663% at the optimal conditions, which were 1 mm as particle size, 3.4 mL/min as condensation flow rate, and 210 min as extraction time. The GC/MS analysis revealed the presence of p-cymene (26.22%), spathulenol (16.71%), and 1.8-cineole (14.44%) as major components.