title: Red upconversion emission in LiNbO3 codoped with Er3+ and Eu3+.
abstract: Red upconversion (UC) emission at 626 nm is obtained from a LiNbO(3) crystal codoped with Er(3+) and Eu(3+) under 800 nm femtosecond laser excitation. Energy transfer from ((2)H(11/2,),(4) S(3/2)) levels of Er(3+), which are excited by excited state absorption, to (5)D(1) of Eu(3+) followed by rapidly relaxing to (5)D(0) nonradiatively leads to this red UC emission. The energy transfer efficiency and Er-Eu transfer microparameter of approximately 30% is obtained in LiNbO(3):Er(3+)(1.0 mol%),Eu(3+)(0.1 mol%). These initial experimental results indicate that the red UC emission can be obtained from Er(3+)/Eu(3+) codoped system under diode laser excitation.
authors.affiliation: Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, PR China.
authors.forename: Ai-Hua
authors.initials: AH
authors.lastname: Li
authors.forename: Zhi-Ren
authors.initials: ZR
authors.lastname: Zheng
authors.forename: Tian-Quan
authors.initials: TQ
authors.lastname: Lü
authors.forename: Qiang
authors.initials: Q
authors.lastname: Lü
authors.forename: Wei-Long
authors.initials: WL
authors.lastname: Liu