Abstract
Cerium doped yttrium aluminum garnet (YAG:Ce3+) nanopowders have been synthesized using sol–gel method. Different synthesized parameters such as molar ratio of citric acid and ethylene glycol to the total metallic ions, complexing molar ratio and pH of the solution have been changed and their influence on structural and luminescence properties have been investigated. Thermal gravimetry and differential scanning calorimetry (TG/DSC), X-ray diffraction technique (XRD), Fourier transforms infrared spectroscopy (FTIR) and photoluminescence (PL) have been used to characterize the samples. Single cubic phase YAG was formed with pH⩽4 and for pH⩾6 additional impurities crystalline phase namely Y4Al2O9 (YAM) and YAlO3 (YAP) have been detected. All samples exhibit intense broad green–yellow emission band in the range of 460–700nm with a maximum intensity at around 530nm assigned to the 5d→4f (2F5/2, 2F7/2) interconfigurationnelles transitions of Ce3+ ion in YAG nanomaterial. The origin of the highest emission intensity obtained for pH=4, citric acid to the total metallic ions of 1:1 (CA:M3+, of 1:1) and a molar ratio of ethylene glycol:citric acid corresponding to 2:1 (EG:CA=2:1) parameters are discussed.
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