title: High room-temperature photoluminescence of one-dimensional Ta2O5 nanorod arrays.
abstract: In this study we analyzed the structural and electronic properties of a new morphological form, one-dimensional (1D) Ta2O5 nanorod arrays, which were synthesized by hot filament metal vapor deposition. Field-emission scanning electron microscopy (FESEM) showed the 1D Ta2O5 nanorods to be arranged in a large-area high-density array about 50 nm wide and approximately 550 nm long. X-ray photoemission spectroscopy (XPS) revealed not only the electronic structures and chemical properties of the 1D Ta2O5 nanorods but also their stoichiometric Ta and O compositions. Photoluminescence (PL) spectra showed intensive green-light, yellow-light and red-light emissions at room temperature. These emissions simultaneously emerged from the trap levels of oxygen vacancies within the Ta2O5 bandgap. The emission results strongly indicate that the 1D Ta2O5 nanorods are good room-temperature visible-light emitters.
authors.affiliation: Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan, Republic of China.
authors.forename: Rupesh S
authors.initials: RS
authors.lastname: Devan
authors.forename: Wei-Der
authors.initials: WD
authors.lastname: Ho
authors.forename: Chia-Hao
authors.initials: CH
authors.lastname: Chen
authors.forename: Hung-Wei
authors.initials: HW
authors.lastname: Shiu
authors.forename: Ching-Hwa
authors.initials: CH
authors.lastname: Ho
authors.forename: Chia-Liang
authors.initials: CL
authors.lastname: Cheng
authors.forename: Sheng Yun
authors.initials: SY
authors.lastname: Wu
authors.forename: Yung
authors.initials: Y
authors.lastname: Liou
authors.forename: Yuan-Ron
authors.initials: YR
authors.lastname: Ma