Articles
  • Microstructure and photoluminescence properties of Nd-doped Bi4Ti3O12 nanocrystalline
  • Dan Liu, Yongping Pu* and Xuan Shi
  • School of Materials Science and Engineering, Shaanxi University of Science and Technology, Shaanxi Xi'an 710021, China
Abstract
Bi4-xNdxTi3O12 (x = 0.25, 0.5, 0.75, 1.00) nanocrystalline was prepared by modified sol-gel method. The powders crystallized well after annealing at 830οC for 30 min in air. Phase composition and optical properties of Bi4-xNdxTi3O12 nanocrystalline were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), photoluminescence (PL) spectra and ultraviolet-visible (UV-Vis) absorption spectra. In PL spectra, the major up-converted band observed at 534 nm (green) originated from the 4G7/2 4I9/2 excited state absorption (ESA) when exciting at 800 nm. It was also found that with increasing of x value the luminous intensity decreased because of different location of Nd3+ substitution. The optical energy band gap of the Bi3.5Nd0.5Ti3O12 nanocrystalline was found to be 3.17 eV by Tauc equation. The up-conversion mechanisms in the doped system will be discussed by analyzing the energy level structures of Nd3+.

Keywords: Bi4Ti3O12, Sol-gel method, Photoluminescence, Up-conversion

This Article

  • 2012; 13(S2): 418-421

    Published on Nov 30, 2012

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