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Indexed by:期刊论文

Date of Publication:2007-12-01

Journal:JOURNAL OF RARE EARTHS

Included Journals:SCIE、ISTIC

Volume:25

Issue:,SI

Page Number:326-329

ISSN No.:1002-0721

Key Words:long afterglow phosphor; SrAl2O4 : Eu2+; Dy3+; iron impurity; quenching; rare earths

Abstract:A series of long afterglow phosphors, Eu2+, Dy3+, with different iron content were prepared by nano-coating process. The resulted precursors were characterized by Transmission Electron Microscope (TEM), which suggested that the precursor particles had nanometer size distribution. The optical quenching of iron impurity on the phosphor powders were investigated by X-Ray powder Diffraction (XRD) and photoluminescence methods. The XRD indicates that a pure monoclinic SrAl2O4: Eu2+, Dy3+ was formed at 1200 degrees C and iron impurity up to 296.36 x 10(-4)% had no effect on the SrAl2O4 : Eu2+, Dy3+ phase structure. However, the luminescence intensity were strongly dependent on the trace iron impurity, which might be explained that iron displace the aluminium and form Fe-O bond, which competed energy with Eu2+ and transfer red them to infrared sites.