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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:321-325

ISSN No.:1002-0721

Key Words:long-lasting phosphor; SrAl2O4 : Eu; Dy; templating synthesis; mesoporous precursor; rare earths

Abstract:Long-lasting SrAl2O4: Eu, Dy phosphor was successfully prepared from a mesoporous precursor. The precursor was synthesized by templating method using nonionic Polyethylene Oxide (PEO) as surfactants, which was proved by TGDTG, X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM) analysis. The analysis results indicated that regular cylindrical-to-hexagonal shaped pores with several nanometers were obtained. The structure and morphology of the SrAl2O4 : Eu, Dy phosphor by templating method was characterized by XRD and Scanning Electron Microscopy (SEM). The XRD results showed that a pure SrAl2O4 phase formed at 900 degrees C by templating method. The SEM morphologies of the obtained phosphors prepared by templating synthesis were uniform and porous multicrystalline with average diameter size of 5 mu m. The broad-band UV-excited SrAl2O4: Eu, Dy phosphor derived from a mosoporous precursor was observed at lambda(max) = 515 nm due to the transitions from the 4f(6)5d(1) to the 4f(7) configurations of Eu2+ ion. The main excitation and emission intensity of the phosphor with this method were stronger than that obtained by solid state reaction method. And the obtained long-lasting phosphor with this method revealed a better afterglow compared to the phosphor prepared through solid state reaction method.