Structure and spectroscopy characterization of La_(1-x)Sm_xVO_4 luminescent nanoparticles synthesized co-precipitation and sol-gel methods

摘要

The Sm-activated orthvanadate nanoparticles withLa(1-x)Sm(x)VO(4) (x <= 0.3) composition were synthesized by coprecipitation and sol-gel methods. XRD study has shown that synthesized samples are characterized by monoclinic or tetragonal structure as well as their mixture dependently on Sm concentration and methods of synthesis. Influence of method of synthesis on morphology of nanoparticles, their absorption, diffuse reflectance and emission spectra was observed and studied. Luminescence properties and diffuse reflectance spectra of the solgel nanoparticles are also depend on Sm concentrations. At least two types of Sm3+ centers were found by emission spectra. These centers have different excitation efficiency by light from the 350-450 nm spectral range. Structures of the centers are discussed taking into account crystal structure, possible defects, morphology of the synthesized nanoparticles and their phase compositions.