title: Magnetic tuning of upconversion luminescence in Au/NaGdF4:Yb3+/Er3+nanocomposite.
abstract: Lanthanide-doped upconversion nanoparticles (UCNPs) NaGdF4:Yb3+/Er3+have received increasing attention due to their unique optical-magnetic bifunctional properties. Here, we show that the luminescent intensity from NaGdF4:Yb3+/Er3+nanoparticles decreases monotonously with increasing the applied magnetic field from 0 to 37.1 T, while plasmon-enhanced upconversion luminescence in Au/NaGdF4:Yb3+/Er3+nanocomposite is independent of a magnetic field lower than 6 T. The surface plasmon resonances could compensate for the energetic mismatching between the excitation light and the energy-level gaps induced by magnetic field and enhance the radiative efficiency, which is the main factor for achieving this stable upconversion emission in this nanocomposite under a magnetic field not higher than 6 T. These findings provide a novel route for exploring the magnetic control of upconversion luminescence in lanthanide-doped bifunctional nanoparticles.
authors.affiliation: Department of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China.
authors.forename: Gangtao
authors.initials: G
authors.lastname: Dai
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Zhong
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Wu
authors.forename: Shiping
authors.initials: S
authors.lastname: Zhan
authors.forename: Shigang
authors.initials: S
authors.lastname: Hu
authors.forename: Pan
authors.initials: P
authors.lastname: Hu
authors.forename: Junshan
authors.initials: J
authors.lastname: Hu
authors.forename: Shaobing
authors.initials: S
authors.lastname: Wu
authors.forename: Junbo
authors.initials: J
authors.lastname: Han
authors.forename: Yunxin
authors.initials: Y
authors.lastname: Liu