title: [Near-infrared luminescence and energy transfer of ACaPO4 : Eu2+, Nd3+ (A = Li, K, Na)].
abstract: Near-infrared (NIR) luminescence phosphors ACaPO4 : Eu2+, Nd2+ (A = Li, K, Na) were prepared by conventional solid state method and the sensitization of Nd3+ near-infrared luminescence by Eu2+ was investigated. The characteristic NIR luminescence of Nd3+ in ACaPO4 matrix is greatly enhanced by co-doping of Eu2+. The fluorescence properties of ACaPO4 : Eu2+, the NIR luminescence properties of ACaPO4 : Eu2+, Nd3+ and the fluorescence lifetime were studied. The effect of emission wavelength of Eu2+ on NIR luminescence of Nd3+ was investigated; The energy transfer mechanism between Eu2+ and Nd3+ was also discussed. Emission peak wavelength of Eu2+ In ACaPO4 matrixes was found red shift with the series of A = Li, K, Na and the extent of the overlap with the different excitation peaks of Nd3+ changes obviously. It was concluded that the emission peak position of Eu2+ is a very important factor for energy transfer, and the optimal wavelength range for Eu2+ --> Nd3+ energy transfer is 500 to 550 nm.
authors.affiliation: Department of Chemistry, Jinan University, Guangzhou 510632, China. xiaoquanlan@126.com
authors.forename: Quan-Lan
authors.initials: QL
authors.lastname: Xiao
authors.forename: Shao-Yu
authors.initials: SY
authors.lastname: Zou
authors.forename: Guan-Xi
authors.initials: GX
authors.lastname: Liu
authors.forename: Wen-Fang
authors.initials: WF
authors.lastname: Peng
authors.forename: Chui-Ming
authors.initials: CM
authors.lastname: Wan
authors.forename: Li-Juan
authors.initials: LJ
authors.lastname: Xie
authors.forename: Jian-Xin
authors.initials: JX
authors.lastname: Meng