title: The effect of Li(+) ions on the luminescent properties of a single-phase white light-emitting phosphor α-Sr2P2O7:Dy(3.).
abstract: Two series of phosphors, α-Sr2(1-x)Dy2xP2O7 and α-Sr2(1-2x)Dy2xLi2xP2O7, with different x values were synthesized successfully using a conventional solid-state method at high temperature for the first time, and their luminescence properties were investigated comparatively. The effect of Li(+) ions on the luminescence properties of Dy(3+) in α-Sr2P2O7 host, including luminescence intensity, optimal doping concentration, concentration quenching mechanism, and decay behavior, was discussed in detail by considering the defect generation in α-Sr2P2O7:Dy(3+), the charge compensation of Li(+) ions and the role of Li2CO3 as solid flux expected in phosphors. The obtained excitation and emission spectra indicate that these as-prepared phosphors can be excited by ultraviolet light and show white light emission due to the combination of the (4)F9/2→(6)H15/2 and (4)F9/2→(6)H13/2 transitions of Dy(3+) ions. The CIE chromaticity coordinates and color correlated temperature of Dy(3+) emission in the phosphor α-Sr2(1-2x)Dy2xLi2xP2O7 (x = 0.03) with optimal fluorescence intensity was also calculated. The present work could be helpful for understanding the effect of the charge compensator (e.g. Li(+) ion) on the luminescent properties of phosphors with non-equivalent ion-displacement and the design of novel phosphors by efficiently taking advantage of charge compensator (e.g. Li(+) ion).
authors.affiliation: School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, People's Republic of China. hanbing@zzuli.edu.cn shihz@zzuli.edu.cn.
authors.forename: Bing
authors.initials: B
authors.lastname: Han
authors.forename: Pengju
authors.initials: P
authors.lastname: Li
authors.forename: Jingtao
authors.initials: J
authors.lastname: Zhang
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.forename: Yongfei
authors.initials: Y
authors.lastname: Xue
authors.forename: Hengzhen
authors.initials: H
authors.lastname: Shi