Synthesis, characterization and properties of the systems containing lanthanum, cerium and nickel oxides obtained by polymeric precursor

The synthesis, characterization and photoluminescence property of the systems containing lanthanum, cerium and nickel oxides were studied. These materials were prepared by the polymeric precursors, calcined at temperatures ranging from 300 to 800 deg C. Afterwards they were characterized by CHN analysis, thermogravimetric analysis, Fourier-transform infrared spectroscopy and X-ray diffraction. The results revealed the formation of the crystalline phases at 800 deg C. The photoluminescence spectra of disordered systems have been observed at room temperature. The lanthanum, cerium and nickel system presented strong photoluminescence intensity centered at 599 nm when excited to 488 nm.