title: Evaluating NaREMgWO6(RE = La, Gd, Y) Doubly Ordered Double Perovskites as Eu3+Phosphor Hosts.
abstract: Three doubly ordered double perovskites NaREMgWO6(RE = La, Gd, Y) have been synthesized via traditional solid-state methods, doped with Eu3+, and characterized to evaluate their promise as Eu3+phosphor hosts. NaYMgWO6, a new member of the family, was found to crystallize in the P21space group and is isostructural with NaGdMgWO6. Emissions characteristic of Eu3+ions (5D0→7F4,3,2,1,0) were observed, with the most intense transition being the5D0→7F2transition near 615 nm. Substitution of Eu3+onto a more compressed RE site in the NaY1-xEuxMgWO6and NaGd1-xEuxMgWO6hosts results in a blue shift of the charge-transfer excitation band and an increase in the intensity of the5D0→7F2transition compared to NaLa1-xEuxMgWO6. All of the hosts can incorporate high concentrations of Eu3+before concentration quenching is observed. When the rare-earth ion is either Gd3+or Y3+, good energetic overlap between the Eu3+charge-transfer band and the absorption of the host lattice results in sensitization and energy transfer from the perovskite host lattice to the Eu3+activator sites. These hosts display comparable if not better luminescence than Y2O3:Eu3+, a commonly used commercial standard, demonstrating their promise as red phosphors.
authors.affiliation: Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210-1185, United States.
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Sharits
authors.affiliation: Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210-1185, United States.
authors.forename: Jason F
authors.initials: JF
authors.lastname: Khoury
authors.affiliation: Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210-1185, United States.
authors.forename: Patrick M
authors.initials: PM
authors.lastname: Woodward