title: The Composite Structure and Two-Peak Emission Behavior of a Ca1.5Ba0.5Si5O3N6:Eu(2+) Phosphor.
abstract: A Ca1.5Ba0.5Si5O3N6:Eu(2+) phosphor with a monoclinic lattice in the Cm space group exhibiting a composite structure consisting of CaSi2O2N2-like and BaSi6N8O-like structures was examined in terms of structure and luminescence. The luminescent properties of the Ca1.5Ba0.5Si5O3N6:Eu(2+) phosphor could be suitable for light-emitting diode applications since it exhibited a promising yellow (or amber) emission peaking at ∼ 570-590 nm at excitations of 450-460 nm. The present investigation was focused on verifying the composite structure by employing quantum mechanical calculations such as the Hartree-Fock ab initio calculation and a density functional theory calculation along with precise structural and compositional analyses. The two-peak emission behavior ascribed to the composite structure was also examined in terms of continuous wave and time-resolved photoluminescence. In addition, the energy transfer between two activator sites ascribed to the composite structure was examined in detail.
authors.forename: Woon Bae
authors.initials: WB
authors.lastname: Park
authors.forename: Hyunmin
authors.initials: H
authors.lastname: Kim
authors.forename: Hwangseo
authors.initials: H
authors.lastname: Park
authors.affiliation: LED Division, Samsung Electronics , Suwon, Kyunggi 443-742, Korea.
authors.forename: Chulsoo
authors.initials: C
authors.lastname: Yoon
authors.forename: Kee-Sun
authors.initials: KS
authors.lastname: Sohn