title: Manipulation of Optical Transmittance by Ordered-Oxygen-Vacancy in Epitaxial LaBaCo2O5.5+δThin Films.
abstract: Giant optical transmittance changes of over 300% in wide wavelength range from 500 nm to 2500 nm were observed in LaBaCo2O5.5+δthin films annealed in air and ethanol ambient, respectively. The reduction process induces high density of ordered oxygen vacancies and the formation of LaBaCo2O5.5(δ = 0) structure evidenced by aberration-corrected transmission electron microscopy. Moreover, the first-principles calculations reveal the origin and mechanism of optical transmittance enhancement in LaBaCo2O5.5(δ = 0), which exhibits quite different energy band structure compared to that of LaBaCo2O6(δ = 0.5). The discrepancy of energy band structure was thought to be the direct reason for the enhancement of optical transmission in reducing ambient. Hence, LaBaCo2O5.5+δthin films show great prospect for applications on optical gas sensors in reducing/oxidizing atmosphere.
authors.affiliation: School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Cheng
authors.affiliation: School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
authors.forename: Jiangbo
authors.initials: J
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, P.R. China.
authors.forename: Dong
authors.initials: D
authors.lastname: Han
authors.affiliation: School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Liu
authors.affiliation: State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, School of Microelectronics, Xidian University, Xi'an, 710071, P.R. China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Lu
authors.affiliation: State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P.R. China.
authors.forename: Chunrui
authors.initials: C
authors.lastname: Ma
authors.affiliation: Department of Physics, Applied Physics, &Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
authors.forename: Shengbai
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Department of Physics and Astronomy, University of Texas at San Antonio, TX 78249, USA.|The Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USA.
authors.forename: Chonglin
authors.initials: C
authors.lastname: Chen