Preparation of a GdCaAl3O7 matrix by the non-hydrolytic sol-gel route

Due to their stable physical and chemical properties, inorganic matrices have been widely employed as hosts for lasers and phosphors. We have prepared a GdCaAl₃O₇ matrix by the non-hydrolytic sol-gel route and have investigated the influence of heating treatment on sample structure. Europium III chloride was added as a structural probe, and the structure was analyzed by thermal analyses (TG/DTA/DSC), X-ray diffraction (XRD), and photoluminescence (PL). The XRD analysis revealed that initial crystallization took place at 400 °C. The peaks corresponding to the GdCaAl₃O₇ and GdAlO₃ phases were observed at 800 and 1000 °C. PL data revealed the characteristic transition bands arising from the ⁵D₀→⁵F_J (J=0, 1, 2, 3, and 4) manifolds under maximum excitation at 275, 391 and 463 nm for all the samples. All the analyses gave evidence that this methodology leads to the formation of a GdCaAl₃O₇ phase.