title: Yellow-to-orange emission from B2+-doped RF2 (R = Ca and Sr) phosphors.
abstract: RF2:Bi (R = Ca and Sr) phosphors were synthesized by solid state reaction method in air and their luminescence properties were investigated. Broad yellow-to-orange emissions peaking at ~550 nm (CaF2:Bi) and ~600 nm (SrF2:Bi) were observed under ~260 nm excitation. The emission centers inRF2:Bi (R = Ca and Sr) phosphors are Bi2+ ions, and the excitation and emission bands of RF2:Bi (R = Ca and Sr) phosphors can be attributed to 2P 1/2 → 2S 1/2 and 2P 3/2(1) → 2P 1/2 transitions of Bi2+ ions, respectively. The phosphors are promising for application in lighting due to broad yellow-to-orange emission.
authors.affiliation: State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China.
authors.forename: Renping
authors.initials: R
authors.lastname: Cao
authors.forename: Fangteng
authors.initials: F
authors.lastname: Zhang
authors.forename: Chenxing
authors.initials: C
authors.lastname: Liao
authors.forename: Jianrong
authors.initials: J
authors.lastname: Qiu