title: Doping alkaline-earth: a strategy of stabilizing hexagonal GdF3 at room temperature.
abstract: Hexagonal GdF3 is a more efficient phosphor host compared with the traditional orthorhombic form but the hexagonal phase is thermodynamically unstable at room temperature. Herein, we present a strategy to stabilize hexagonal GdF3 by doping with alkaline-earth ions in a mild hydrothermal reaction system. The selection of the dopant, effect of the dopant amount and the mechanism of the phase transition was discussed in detail. The luminescence variation of GdF3:Eu was demonstrated to verify the phase transformation. Furthermore, the upconversion luminescence of the Sr-doped and undoped GdF3:Yb/Er was investigated.
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. hpyou@ciac.ac.cn.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhao
authors.forename: Baiqi
authors.initials: B
authors.lastname: Shao
authors.forename: Wei
authors.initials: W
authors.lastname: Lü
authors.forename: Yongchao
authors.initials: Y
authors.lastname: Jia
authors.forename: Wenzhen
authors.initials: W
authors.lastname: Lv
authors.forename: Mengmeng
authors.initials: M
authors.lastname: Jiao
authors.forename: Hongpeng
authors.initials: H
authors.lastname: You
mesh_terms: D005682:Gadolinium / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008673:Metals, Alkaline Earth / Q000737:chemistry*; D044367:Phase Transition; D013696:Temperature; D013816:Thermodynamics
chemical_list: D007477:Ions; D008673:Metals, Alkaline Earth; D005682:Gadolinium