title: Spectroscopy and Calculations for f-f Transitions of Tb3+ Ions in KY3F10 Nanocrystal.
abstract: A modified Judd-Ofelt theory is used in this paper to treat the electric dipole transitions within the 4f8 configuration of Tb3+ by considering the main perturbing components. Through the energy-level calculation and the strandard tensorial analysis, the explicit distances between the 4f7 5d configuration and the 5D4 state and other lower 4f8 energy levels are determined. The rare-earth ion Tb3+ substituted at Y3+ sites in KY3F10 has the site symmetry of C4v. The standard Judd-Ofelt parameters A2(10), A2(30), A4(30), A4(50), A6(50), A4(54) and A6(54) are included in the calculation together with odd-λ parameters A1(10), A3(30), A5(50) and A5(54). The fluorescence branching ratios originating from 5D4 are calculated. Compared with the experimental measurements, the modified model yields better results than the standard Judd-Ofelt theory.
authors.forename: Jinsu
authors.initials: J
authors.lastname: Zhang
authors.forename: Baojiu
authors.initials: B
authors.lastname: Chen
authors.forename: Jiashi
authors.initials: J
authors.lastname: Sun
authors.forename: Xiangping
authors.initials: X
authors.lastname: Li
authors.forename: Lihong
authors.initials: L
authors.lastname: Cheng
authors.forename: Haiyang
authors.initials: H
authors.lastname: Zhong