title: Controlled synthesis, optical and electronic properties of Eu3+ doped yttrium oxysulfide (Y2O2S) nanostructures.
abstract: Single crystalline Eu(3+) doped yttrium oxysulfide (Y(2)O(2)S) nanocrystals, nanosheets, nanobelts, nanotubes, nanorods and nanowires have been successfully prepared via precursors of Y(OH)(3) nanostructures in high yields and purities by a convenient hydrothermal method under mild conditions. Comprehensive structural, morphological and spectroscopical studies have been carried out on the nanometre scale. The as-prepared samples are characterized using X-ray photoelectron spectra (XPS), to investigate the elementary states on the surfaces. A significant shift (approximately 0.22-0.36 eV) in the optical spectra of the Y(2)O(2)S:Eu(3+) system corresponding to the fundamental absorption and charge transfer bands, respectively, with respect to the bulk counterpart. The zero and one-dimensional (1D) nanostructures are good candidates for investigating size-induced opto-electronic properties of functional oxysulfides. In order to identify the origin and nature of the electronic transitions observed in the visible region, the photo-induced impedance measurements have been extended to the zero and 1D nanostructures.
authors.affiliation: Department of Physics, Sree Sevugan Annamalai College, Devakottai 630 033 (TN), India.
authors.forename: Jagannathan
authors.initials: J
authors.lastname: Thirumalai
authors.forename: Rathinam
authors.initials: R
authors.lastname: Chandramohan
authors.forename: Sushil
authors.initials: S
authors.lastname: Auluck
authors.forename: Thaiyan
authors.initials: T
authors.lastname: Mahalingam
authors.forename: Subbiah R
authors.initials: SR
authors.lastname: Srikumar