title: Rare-earth-free white emitting Ba2TiP2O9 phosphor: revealing its crystal structure and photoluminescence properties.
abstract: A high intensity bluish-white emitting Ba2TiP2O9 phosphor was synthesized by a conventional solid-state reaction method and the precise crystal structure was investigated for the first time by Rietveld refinement analysis. Ba2TiP2O9 has a monoclinic crystal structure with a space group C2/c (no. 15), which is built out of PO4 tetrahedra and TiO5 pyramidal polyhedra connected to form a chain structure along the c-axis. The emission of Ba2TiP2O9 is due to a charge transfer transition between Ti(4+)-O(2-) in the pyramidal TiO5. The obtained Ba2TiP2O9 was excited efficiently by UV and VUV and displayed a bright bluish-white luminescence.
authors.affiliation: Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-cho, Niigata 950-2181, Japan. ktoda@eng.niigata-u.ac.jp.
authors.forename: Takuya
authors.initials: T
authors.lastname: Hasegawa
authors.forename: Sun Woog
authors.initials: SW
authors.lastname: Kim
authors.forename: Shinnosuke
authors.initials: S
authors.lastname: Kamei
authors.forename: Tadashi
authors.initials: T
authors.lastname: Ishigaki
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Uematsu
authors.forename: Koutoku
authors.initials: K
authors.lastname: Ohmi
authors.forename: Kenji
authors.initials: K
authors.lastname: Toda
authors.forename: Mineo
authors.initials: M
authors.lastname: Sato