title: Crystal structure, luminescence properties, energy transfer and thermal properties of a novel color-tunable, white light-emitting phosphor Ca9-x-yCe(PO4)7:xEu2+,yMn2.
abstract: A series of Ca9-x-yCe(PO4)7:xEu2+,yMn2+phosphors were synthesized by a high-temperature solid-state reaction method. The as-prepared samples were characterized by XRD and EDX measurements, which showed that Eu2+and Mn2+could be efficiently doped into the host. Ce3+acts concurrently as activator and sensitizer in Ca9Ce(PO4)7, and the energy transfer mechanisms between Ce3+/Eu2+and Ce3+/Mn2+in Ca9Ce(PO4)7were validated and proven to be a resonant type via dipole-quadrupole and dipole-dipole interactions, respectively. Besides, there is also energy transfer from Eu2+to Mn2+ions. The host, Ca9Ce(PO4)7, emits blue-white light and Ca9Ce(PO4)7:xEu2+,yMn2+phosphors emit blue-green through white to orange-red light under near-ultraviolet radiation as a result of tuning the ratio of Eu2+/Mn2+. Ca9Ce(PO4)7:0.04Eu2+,0.08Mn2+emits white light with CIE coordinates (0.333, 0.310), a CCT of 5446 K, and a high CRI of 81. The energy transfer efficiency between Ce3+and Mn2+increases significantly with temperature. These results reveal that Ca9Ce(PO4)7:Eu2+,Mn2+may be a potential candidate for white light-emitting phosphors.
authors.affiliation: College of Physics Science & Technology, Hebei Key Lab of Optic-Electronic Information and Materials, Hebei University, Baoding 071002, China. +li_panlai@126.com wangzj1998@126.com.
authors.forename: Chao
authors.initials: C
authors.lastname: Wang
authors.affiliation: College of Physics Science & Technology, Hebei Key Lab of Optic-Electronic Information and Materials, Hebei University, Baoding 071002, China. +li_panlai@126.com wangzj1998@126.com.
authors.forename: Panlai
authors.initials: P
authors.lastname: Li
authors.affiliation: College of Physics Science & Technology, Hebei Key Lab of Optic-Electronic Information and Materials, Hebei University, Baoding 071002, China. +li_panlai@126.com wangzj1998@126.com.
authors.forename: Zhijun
authors.initials: Z
authors.lastname: Wang
authors.affiliation: College of Physics Science & Technology, Hebei Key Lab of Optic-Electronic Information and Materials, Hebei University, Baoding 071002, China. +li_panlai@126.com wangzj1998@126.com.
authors.forename: Yuansheng
authors.initials: Y
authors.lastname: Sun
authors.affiliation: College of Physics Science & Technology, Hebei Key Lab of Optic-Electronic Information and Materials, Hebei University, Baoding 071002, China. +li_panlai@126.com wangzj1998@126.com.
authors.forename: Jinge
authors.initials: J
authors.lastname: Cheng
authors.affiliation: College of Physics Science & Technology, Hebei Key Lab of Optic-Electronic Information and Materials, Hebei University, Baoding 071002, China. +li_panlai@126.com wangzj1998@126.com.
authors.forename: Zhenling
authors.initials: Z
authors.lastname: Li
authors.affiliation: College of Physics Science & Technology, Hebei Key Lab of Optic-Electronic Information and Materials, Hebei University, Baoding 071002, China. +li_panlai@126.com wangzj1998@126.com.
authors.forename: Miaomiao
authors.initials: M
authors.lastname: Tian
authors.affiliation: College of Physics Science & Technology, Hebei Key Lab of Optic-Electronic Information and Materials, Hebei University, Baoding 071002, China. +li_panlai@126.com wangzj1998@126.com.
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Yang