title: Enhanced green upconversion emission of Er(3+) through energy transfer by Dy(3+) under 800 nm femtosecond-laser excitation.
abstract: Er(3+) green upconversion (UC) emission corresponding to the transition of (4)S(3/2) ((2)H(11/2))-->(4)I(15/2) is enhanced in a Er/Dy-codoped LiNbO(3) crystal compared with Er-doped LiNbO(3) under 800 nm femtosecond-laser excitation at room temperature. The upconversion mechanisms are proposed based on spectral, kinetic, and pump-power dependence analyses. The energy-transfer efficiency from Dy(3+)((4)F(9/2)) to Er(3+)((4)F(7/2)) is 33%, which results in the enhancement of green UC emission. This energy transfer is advantageous for the Er(3+) UC emission sensitized by Dy(3+), especially in a low-phonon-energy host matrix.
authors.affiliation: Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin, China.
authors.forename: Ai-Hua
authors.initials: AH
authors.lastname: Li
authors.forename: Qiang
authors.initials: Q
authors.lastname: Lü
authors.forename: Zhi-Ren
authors.initials: ZR
authors.lastname: Zheng
authors.forename: Liang
authors.initials: L
authors.lastname: Sun
authors.forename: Wen-Zhi
authors.initials: WZ
authors.lastname: Wu
authors.forename: Wei-Long
authors.initials: WL
authors.lastname: Liu
authors.forename: Heng-Zhi
authors.initials: HZ
authors.lastname: Chen
authors.forename: Yan-Qiang
authors.initials: YQ
authors.lastname: Yang
authors.forename: Tian-Quan
authors.initials: TQ
authors.lastname: Lü
mesh_terms: D004553:Electric Conductivity; D004867:Equipment Design; D007477:Ions; D007834:Lasers; D054023:Lasers, Semiconductor; D008674:Metals, Rare Earth; D015233:Models, Statistical; D055095:Optics and Photonics; D013696:Temperature; D013997:Time Factors
chemical_list: D007477:Ions; D008674:Metals, Rare Earth