title: Spectral-converting study of Ba((9-3)(m+n)/2)Er(m)Yb(n)Y2Si6O24 (m = 0.005 - 0.2, n = 0 - 0.3) orthosilicate phosphors.
abstract: Optical materials composed of Ba((9-3)(m+n)/2)Er(m)Yb(n)Y2Si6O24 (m = 0.005-0.2, n = 0-0.3) were prepared using a solid-state reaction. The X-ray diffraction patterns of the obtained phosphors were examined to index the peak positions. The photoluminescence (PL) excitation and emission spectra of the Er(3+)-activated phosphors and the critical emission quenching as a function of Er(3+) content in the Ba(9-3m/2)Er(m)Y2Si6O24 structure were monitored. The spectral conversion properties of Er(3+) and Er(3+)-Yb(3+) ions doped in Ba9Y2Si6O24 phosphors were elucidated under diode-laser irradiation at 980 nm. Up-conversion emission spectra and the dependence of the emission intensity on pump power for the Ba8.55Er0.1Yb0.2Y2Si6O24 phosphor were investigated. The desired up-conversion of the emitted light, which passed through the green, yellow, orange and red regions of the spectrum, was achieved through the use of appropriate Er(3+) and/or Yb(3+) concentrations in the host structure and 980 nm excitation light. The up-conversion mechanism in the phosphors is described by an energy-level schematic.
authors.affiliation: Center for Green Fusion Technology and Department of Engineering in Energy & Applied Chemistry, Silla University, Busan, 617-736, Republic of Korea.
authors.forename: Seul-Ki
authors.initials: SK
authors.lastname: Choi
authors.affiliation: Center for Green Fusion Technology and Department of Engineering in Energy & Applied Chemistry, Silla University, Busan, 617-736, Republic of Korea.
authors.forename: Sangmoon
authors.initials: S
authors.lastname: Park
mesh_terms: D001464:Barium / Q000737:chemistry*; D004871:Erbium / Q000737:chemistry*; D049449:Luminescence; D008163:Luminescent Measurements; D055620:Optical Phenomena; D010100:Oxygen / Q000737:chemistry; D055668:Photochemical Processes; D017640:Silicates / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D015018:Ytterbium / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry*
chemical_list: D017640:Silicates; D001464:Barium; D015019:Yttrium; D004871:Erbium; D015018:Ytterbium; D010100:Oxygen; D012825:Silicon
keywords: Er3+; Yb3+; conversion; energy transfer; luminescence; orthosilicate