title: Fluorescence properties of Dy(3+) doped La(3)Ga(5.5)Nb(0.5)O(14) nanocrystals.
abstract: The effects of Dy(3+) doping concentration and calcinations on the fluorescence properties of La(3)Ga(5.5)Nb(0.5)O(14) (Dy:LGN) nanocrystals were examined for the first time. High quality Dy:LGN nanocrystals were synthesized by the sol-gel method. The room temperature fluorescence spectra were measured; they showed a yellow emission, which can be attributed to the (4)F(9/2)-(6)H(13/2) transition. The relationship between the relative emission intensity and the doping concentration of the specimens, sintered at different temperatures, is consistent with a Gaussian distribution according a fitted and modified formula. The optimum value of the Dy(3+) doping concentration in LGN nanocrystals is in the range 2.0-2.5%. Moreover, in LGN bulk crystal for laser use, the optimum value, calculated through the obtained formula, is presumed in the range 1.5-2.0%. The fluorescent lifetime of a 2.0% Dy:LGN nanocrystal is quite short, only about 8.5 ns.
authors.affiliation: State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China.
authors.forename: F P
authors.initials: FP
authors.lastname: Yu
authors.forename: D R
authors.initials: DR
authors.lastname: Yuan
authors.forename: L M
authors.initials: LM
authors.lastname: Kong
authors.forename: X L
authors.initials: XL
authors.lastname: Duan
authors.forename: S Y
authors.initials: SY
authors.lastname: Guo
authors.forename: X Q
authors.initials: XQ
authors.lastname: Wang
authors.forename: X
authors.initials: X
authors.lastname: Zhao