title: Investigation on the upconversion emission in 2D BiOBr:Yb(3+)/Ho(3+) nanosheets.
abstract: As lanthanide doped upconverting host, two dimensional (2D) nanostructure materials have remarkable advantages compare with the bulk materials, but excellent 2D upconversion nanohost is still few up to date. In this work, Yb(3+)/Ho(3+) co-doped BiOBr nanosheets have been successfully prepared via a facile hydrothermal method, which were characterized by X-ray diffraction, transmission electron microscopy, Atomic Force Microscope, Raman spectra, Fourier transform infrared absorption and UC luminescence spectra. Under excitation at 980 nm, bright green UC emission centered at 550 nm accompanied with weak red (663 nm) and near infrared (NIR) UC emissions (760 nm) were observed. Power dependence studies revealed that NIR and red UC emissions were both dominated by a two and one-photon process due to saturation effects that is related to the special crystal structure of BiOBr nanosheets, and a different UC mechanism of NIR emission from Ho(3+) was proposed accordingly.
authors.affiliation: School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; Department of Science Research, Yunnan Technology and Business University, Kunming 651700, China.
authors.forename: Yongjin
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China. Electronic address: songzg@kmust.edu.cn.
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Song
authors.affiliation: School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China. Electronic address: gable-001@163.com.
authors.forename: Zhaoyi
authors.initials: Z
authors.lastname: Yin
authors.affiliation: School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
authors.forename: Qingliang
authors.initials: Q
authors.lastname: Kuang
authors.affiliation: School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
authors.forename: Ronghua
authors.initials: R
authors.lastname: Wan
authors.affiliation: School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
authors.forename: Yuting
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
authors.forename: Qun
authors.initials: Q
authors.lastname: Liu
authors.affiliation: School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
authors.forename: Jianbei
authors.initials: J
authors.lastname: Qiu
authors.affiliation: School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
authors.forename: Zhengwen
authors.initials: Z
authors.lastname: Yang
keywords: BiOBr:Yb(3+)/Ho(3+); Nanosheets; Upconversion