title: X-ray absorption and luminescence studies of Ba2Ca(BO3)2: Ce3+/Na+ phosphors.
abstract: X-ray excited optical luminescence (XEOL) spectroscopy has been used to investigate the optical emission properties of Ce(3+) activated Ba(2)Ca(BO(3))(2) with a charge-compensating Na(+) and the results are compared with the optical emission properties from UV excitation. Further, x-ray absorption near-edge structure (XANES) has been employed to study the chemical environment and energy transfer efficiency to optical emission upon x-ray excitation. XEOL results agree well with optical emission with UV excitation. XANES results across various absorption edges show that while the chemical environment of host materials does not change significantly with doping, luminescence yield decreases significantly at absorption edges due to an abrupt change in the de-excitation mechanism.
authors.affiliation: Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada.
authors.forename: J Y Peter
authors.initials: JY
authors.lastname: Ko
authors.forename: Yun-Mui
authors.initials: YM
authors.lastname: Yiu
authors.forename: Hongbin
authors.initials: H
authors.lastname: Liang
authors.forename: Tsun-Kong
authors.initials: TK
authors.lastname: Sham
mesh_terms: D000042:Absorption; D001881:Borates / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D008163:Luminescent Measurements; D008958:Models, Molecular; D008968:Molecular Conformation; D012964:Sodium / Q000737:chemistry*; D056928:X-Ray Absorption Spectroscopy
chemical_list: D001881:Borates; C552408:barium calcium borate; D002563:Cerium; D012964:Sodium