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Title: A self-activated silicate phosphor of Na{sub 5}YZrSi{sub 6}O{sub 18}

Graphical abstract: Self-activated Na{sub 5}YZrSi{sub 6}O{sub 18} shows a bright green luminescence. It presents obvious LLP afterglow with duration time >3 h after the removal of excitation. The substitution of Y{sup 3+} by rare earth ions except Yb{sup 3+} cannot prolong the afterglow. It is proposed that the disorder in the lattices can result in different trap centers attributing to the long last phosphorescence. - Highlights: • Na{sub 5}YZrSi{sub 6}O{sub 18} was firstly developed to be a new bluish green-emitting silicate. • Na{sub 5}YZrSi{sub 6}O{sub 18} presents unusual properties: efficient excitation and longer emission wavelength. • Na{sub 5}YZrSi{sub 6}O{sub 18} shows long-lasting phosphorescence with duration time above 3 h. - Abstract: A new self-activated silicate phosphor of Na{sub 5}YZrSi{sub 6}O{sub 18} was prepared by a solid-state reaction method. The phase formation was confirmed by X-ray powder diffraction measurement. The photoluminescence excitation and emission spectra, X-ray-excited luminescence, decay curves, quantum efficiencies and the color coordinates were investigated. It can be efficiently excited by UV light and X-ray and presents unusual green emission (centered at 475 nm) from Zr{sup 4+} to O{sup 2−} charge transfer transition. Meanwhile, the phosphor shows long-lasting phosphorescence with duration time above 3 h after the removal ofmore » excitation. The afterglow curves and thermo-luminescence were measured for pure and rare earth ions (RE = Yb, Er, Ho, Dy, Tb, Sm, Nd) doped Na{sub 5}YZrSi{sub 6}O{sub 18}. The possible defects and the mechanism of long-lasting phosphorescence were suggested on the base of the strong disorder of the multiply cation sites in the lattices.« less
Authors:
; ;  [1] ;  [1] ;  [2] ;  [2]
  1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123 (China)
  2. Department of Physics and Center for Marine-Integrated Biomedical Technology, Pukyong National University, Busan 608-737 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22348663
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 54; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CATIONS; CERAMICS; DOPED MATERIALS; EMISSION SPECTRA; EXCITATION; PHOSPHORESCENCE; PHOTOLUMINESCENCE; QUANTUM EFFICIENCY; RARE EARTHS; REMOVAL; SILICATES; SOLIDS; SYNTHESIS; X RADIATION; X-RAY DIFFRACTION; YTTERBIUM IONS; YTTRIUM IONS; ZIRCONIUM IONS