title: Cooperative energy transfer frequency upconversion in Tb3+/Yb3+-codoped oxyfluoride glasses.
abstract: In this report, we investigate the cooperative energy transfer frequency upconversion in Tb3+/Yb3+-codoped SiO2-Al(2)O(3)-Na2O-ZnF(2) oxyfluoride glasses under 980 nm diode laser excitation. The influence of both Tb3+ and Yb3+ concentration on the emission bands were investigated. With a lower Tb3+ concentration, the emission bands around 381, 416 and 438 nm, and 489, 545, 587 and 623 nm associated with (5)D(3), (5)G(6)-->(7)F(J) (J=6, 5, 4) and (5)D(4)-->(7)F(J) (J=6, 5, 4, 3) transitions were observed. However, only (5)D(4)-->(7)F(J) (J=6, 5, 4, 3) transitions appear in a higher Tb3+ concentration. The integrated upconversion luminescence intensity was examined when the temperature of sample was varied from 40 to 450 K. The dependence of the upconversion emission intensity upon the excitation power was also examined, and the upconversion mechanisms were discussed.
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Feng
authors.forename: Jianhui
authors.initials: J
authors.lastname: Zhang
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Hongbin
authors.initials: H
authors.lastname: Liang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Su
mesh_terms: D004735:Energy Transfer; D005461:Fluorine / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D007477:Ions; D007834:Lasers; D049449:Luminescence; D010087:Oxides / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013696:Temperature; D013725:Terbium / Q000737:chemistry*; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D007477:Ions; D010087:Oxides; D013725:Terbium; D005461:Fluorine; C014559:fluorine monoxide; D015018:Ytterbium