Controlled synthesis of Eu2+-doped barium silicate nanostructures and their optical properties

Several shapes of Eu2+-doped barium silicate nanostructures have been simply obtained by a hydrothermal method. Hedgehog-like, spherical-shaped, porous irregular spherical, hollow worm-like, and cracked worm shell-like structures are synthesized with changing the molar ratios of Ba/Si in solution. The possible formation mechanisms of these barium silicate nanostructures are proposed. Under an excitation wavelength of 360 nm, all the products show broad emission bands from about 400 to 625 nm. The UV region excitation band from 300 to 400 nm confirms the possibility that the nanostructures could be used as phosphors for white LEDs.