title: Single-phased white-light-emitting Ca₄(PO₄)₂O:Ce³⁺,Eu²⁺ phosphors based on energy transfer.
abstract: A novel single-composition Ca4(PO4)2O:Ce(3+),Eu(2+) phosphor emitting white light was synthesized by conventional solid-state reaction for light-emitting diode applications. X-ray diffraction, photoluminescence spectra, and luminescence decay spectra were used to characterize the samples. Energy transfer from Ce(3+) to Eu(2+) ions was observed in the co-doped samples, and the transfer mechanism in the Ca4(PO4)2O:Ce(3+),Eu(2+) phosphors was dipole-dipole interaction. The emission hue of Ca4(PO4)2O:Ce(3+),Eu(2+) was found to vary from blue (0.165, 0.188) to white (0.332, 0.300) and eventually to orange (0.519, 0.366) by precisely controlling the ratio of Ce(3+) to Eu(2+). The combination of a 380 nm near-ultraviolet chip with a Ca4(PO4)2O:0.02Ce(3+),0.012Eu(2+) phosphor produced a diode emitting white light with ultra-wideband emission and a correlated color temperature of 4124 K. Overall, results indicated that the prepared samples may be potentially applied in white-light-emitting diodes.
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. cyli@ciac.ac.cn rsliu@ntu.edu.tw.
authors.forename: Yonglei
authors.initials: Y
authors.lastname: Jia
authors.forename: Ran
authors.initials: R
authors.lastname: Pang
authors.forename: Haifeng
authors.initials: H
authors.lastname: Li
authors.forename: Wenzhi
authors.initials: W
authors.lastname: Sun
authors.forename: Jipeng
authors.initials: J
authors.lastname: Fu
authors.forename: Lihong
authors.initials: L
authors.lastname: Jiang
authors.forename: Su
authors.initials: S
authors.lastname: Zhang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Su
authors.forename: Chengyu
authors.initials: C
authors.lastname: Li
authors.forename: Ru-Shi
authors.initials: RS
authors.lastname: Liu