title: Controllable Eu valence for photoluminescence tuning in apatite-typed phosphors by the cation cosubstitution effect.
abstract: By cosubstituting [Ca(2+)-P(5+)] for [La(3+)-Si(4+)] in the Eu-doped Ca(2→8)La(8→2)(SiO4)6-x(PO4)xO2 (0 ≤ x ≤ 6) system, Eu(3+) ions are controllably and gradually transformed to Eu(2+). Thus, the emission colors consecutively changed from red to blue/green light. Furthermore, excellent warm-white lights with the low correlated color temperature (CCT) range of 3500-3800 K and a high color rendering index (Ra) (88.4-93.2) have been achieved by mixing the as-prepared phosphors at different cation cosubstitution ratios.
authors.affiliation: Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China. ggli8312@gmail.com.
authors.forename: Guogang
authors.initials: G
authors.lastname: Li
authors.affiliation: Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands. cclin0530@gmail.com.
authors.forename: Chun Che
authors.initials: CC
authors.lastname: Lin
authors.affiliation: Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China. ggli8312@gmail.com.
authors.forename: Yi
authors.initials: Y
authors.lastname: Wei
authors.affiliation: Department of Chemistry, South University of Science and Technology of China, Shenzhen, Guangdong 518055, P. R. China.
authors.forename: Zewei
authors.initials: Z
authors.lastname: Quan
authors.affiliation: Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China. ggli8312@gmail.com.
authors.forename: Ying
authors.initials: Y
authors.lastname: Tian
authors.affiliation: Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China. ggli8312@gmail.com.
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan.
authors.forename: Ting-Shan
authors.initials: TS
authors.lastname: Chan
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. jlin@ciac.ac.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Lin