title: [The upconversion luminescence of Tm(0.35)Yb(5):FOV nanophase oxyfluoride vitroceramics].
abstract: The upconversion luminescence of nanophase oxyfluoride vitroceramics Tm(0.35)Yb(5) : FOV when excited by a 975 nm diode laser was studied in the present paper. Several ultraviolet upconversion luminescence lines positioned at 363.6 nm, (462.6 nm, 477.0 nm), 648.7 nm, (699.7 nm, 680.7 nm) and (777.6 nm, 800.7 nm) were found. They can be attributed to the fluorescence transitions of 1 D2-->3 H6, 1 G4-->3 H6, 1 G4-->3 F4, 3 F3-->3 H6 and 3 H4-->3 H6 of Tm3+ ion. The careful measurement and analysis of the variation of upconversion luminescence intensity F as a function of the 975 nm pumping laser power P has proven that the upconversion luminescence of 1 D2 state is partly a five-photon upconversion luminescence, while the upconversion luminescence of 1 G4 and 3 H4 state is the three-photon and two-photon upconversion luminescence respectively.
authors.affiliation: Applied Optics Beijing Area Major Laboratory, Physics Department and Analysis and Testing Center, Beijing Normal University, Beijing 100875, China. xbchen@bnu.edu.cn
authors.forename: Xiao-bo
authors.initials: XB
authors.lastname: Chen
authors.forename: Ya-fei
authors.initials: YF
authors.lastname: Wang
authors.forename: Naruhito
authors.initials: N
authors.lastname: Sawanobori
authors.forename: Guo-jian
authors.initials: GJ
authors.lastname: Yang
authors.forename: Jian-sheng
authors.initials: JS
authors.lastname: Cui
authors.forename: Chen-juan
authors.initials: CJ
authors.lastname: He
authors.forename: Zhi-jian
authors.initials: ZJ
authors.lastname: Chen
authors.forename: Da-he
authors.initials: DH
authors.lastname: Liu
authors.forename: Fang-lin
authors.initials: FL
authors.lastname: Peng
authors.forename: Zeng-fu
authors.initials: ZF
authors.lastname: Song