title: Optical properties of ZnO and ZnO:In nanorods assembled by sol-gel method.
abstract: Self-assembled zinc oxide (ZnO) and indium-doping zinc oxide (ZnO:In) nanorod thin films were synthesized on quartz substrates without catalyst in aqueous solution by sol-gel method. The samples were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM), Raman-scattering spectroscopy, room-temperature photoluminescence (PL) spectra, and temperature-dependent PL spectra measurements. XRD and Raman spectra illustrated that there were no single In2O3 phase in ZnO lattice after indium doping. The PL spectra of ZnO showed a strong UV emission band located at 394 nm and a very weak visible emission associated with deep-level defects. Indium incorporation induced the shift of optical band gap, quenching of the near-band-edge photoluminescence and enhanced LO mode multiphonon resonant Raman scattering in ZnO crystals at different temperatures. Abnormal temperature dependence of UV emission integrated intensity of ZnO and ZnO:In samples is observed. The local state emission peak of ZnO:In samples at 3.37 eV is observed in low-temperature PL spectra. The near-band-edge emission peak at room temperature was a mixture of excitons and impurity-related transitions for both of two samples.
authors.affiliation: Center for Advanced Optoelectronic Functional Material Research, Northeast Normal University, Changchun 130024, People's Republic of China.
authors.forename: Y W
authors.initials: YW
authors.lastname: Chen
authors.forename: Y C
authors.initials: YC
authors.lastname: Liu
authors.forename: S X
authors.initials: SX
authors.lastname: Lu
authors.forename: C S
authors.initials: CS
authors.lastname: Xu
authors.forename: C L
authors.initials: CL
authors.lastname: Shao
authors.forename: C
authors.initials: C
authors.lastname: Wang
authors.forename: J Y
authors.initials: JY
authors.lastname: Zhang
authors.forename: Y M
authors.initials: YM
authors.lastname: Lu
authors.forename: D Z
authors.initials: DZ
authors.lastname: Shen
authors.forename: X W
authors.initials: XW
authors.lastname: Fan