title: Strong visible up-conversion emission in Tb3+, Tm3+ and Tb3+-Tm3+ co-doped tellurite glasses sensitized by Yb3+.
abstract: Up-conversion luminescence characteristics under 975 nm excitation have been investigated with Tb3+/Tm3+/Yb3+ triply doped tellurite glasses. Here, green (547 nm: (5)D(4)-->(7)F(4)) and red (660 nm: (5)D(4)-->(7)F(2)) up-conversion (UC) luminescence originating from Tb3+ is observed strongly, because of the quadratic dependences of emission intensities on the excitation power. Especially, the UC luminescence was intensified violently with the energy transfer from the Tm3+ ions involves in the Tb3+ excitation. To the Tb3+/Tm3+/Yb3+ triply doped glass system, a novel up-conversion mechanism is proposed as follows: the energy of (3)G(4) level (Tm3+) was transferred to (5)D(4) (Tb(3+)) and the 477-nm UC luminescence of Tm3+ was nearly quenched.
authors.affiliation: Shanghai Institute of Optics & Fine Mechanics, CAS, Shanghai 201800, China. xunsiwang@siom.ac.cn
authors.forename: Xunsi
authors.initials: X
authors.lastname: Wang
authors.forename: Liren
authors.initials: L
authors.lastname: Liu
authors.forename: Qiuhua
authors.initials: Q
authors.lastname: Nie
authors.forename: Tiefeng
authors.initials: T
authors.lastname: Xu
authors.forename: Xiang
authors.initials: X
authors.lastname: Shen
authors.forename: Shixun
authors.initials: S
authors.lastname: Dai
authors.forename: Xianghua
authors.initials: X
authors.lastname: Zhang
mesh_terms: D005898:Glass / Q000737:chemistry*; D007477:Ions; D049449:Luminescence; D013053:Spectrophotometry / Q000379:methods; D013691:Tellurium / Q000737:chemistry*; D013725:Terbium / Q000737:chemistry*; D013932:Thulium / Q000737:chemistry*; D013997:Time Factors; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D007477:Ions; D013725:Terbium; D013932:Thulium; C026660:tellurous acid; D015018:Ytterbium; D013691:Tellurium