title: Tuning of Photoluminescence by Cation Nanosegregation in the (CaMg)(x)(NaSc)(1-x)Si2O6 Solid Solution.
abstract: Controlled photoluminescence tuning is important for the optimization and modification of phosphor materials. Herein we report an isostructural solid solution of (CaMg)x(NaSc)1-xSi2O6 (0 < x < 1) in which cation nanosegregation leads to the presence of two dilute Eu(2+) centers. The distinct nanodomains of isostructural (CaMg)Si2O6 and (NaSc)Si2O6 contain a proportional number of Eu(2+) ions with unique, independent spectroscopic signatures. Density functional theory calculations provided a theoretical understanding of the nanosegregation and indicated that the homogeneous solid solution is energetically unstable. It is shown that nanosegregation allows predictive control of color rendering and therefore provides a new method of phosphor development.
authors.affiliation: The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing , Beijing 100083, China.
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Xia
authors.forename: Guokui
authors.initials: G
authors.lastname: Liu
authors.forename: Jianguo
authors.initials: J
authors.lastname: Wen
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Mei
authors.forename: Mahalingam
authors.initials: M
authors.lastname: Balasubramanian
authors.affiliation: Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS , Krasnoyarsk 660036, Russia.|Department of Physics, Far Eastern State Transport University , Khabarovsk 680021, Russia.
authors.forename: Maxim S
authors.initials: MS
authors.lastname: Molokeev
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Licong
authors.initials: L
authors.lastname: Peng
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Gu
authors.forename: Dean J
authors.initials: DJ
authors.lastname: Miller
authors.affiliation: The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing , Beijing 100083, China.
authors.forename: Quanlin
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Poeppelmeier