title: Tailoring of deep-red luminescence in Ca2SiO4:Eu(2+).
abstract: We report a new dicalcium silicate phosphor, Ca(2-x)Eu(x)SiO4, which emits red light in response to blue-light excitation. When excited at 450 nm, deep-red emission at 650 nm was clearly observed in Ca1.2Eu0.8SiO4, the external and internal quantum efficiencies of which were 44 % and 50 %, respectively. The red emission from Ca(2-x)Eu(x)SiO4 was strongly related to the peculiar coordination environments of Eu(2+) in two types of Ca sites. The red-emitting Ca2SiO4:Eu(2+) phosphors are promising materials for next-generation, white-light-emitting diode applications.
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan); Present address: Department of Chemistry, Faculty of Science, Okayama University of Science, Okayama 700-0005 (Japan). satoy@tagen.tohoku.ac.jp.
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Sato
authors.forename: Hideki
authors.initials: H
authors.lastname: Kato
authors.forename: Makoto
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Takaki
authors.initials: T
authors.lastname: Masaki
authors.forename: Dae-Ho
authors.initials: DH
authors.lastname: Yoon
authors.forename: Masato
authors.initials: M
authors.lastname: Kakihana
keywords: crystal-site engineering; lanthanides; luminescence; phosphors; silicates