Synthesis and characterization of long persistence Sr4Al14O25: Eu2+, Dy3+ phosphor prepared by combustion method

Bum Joon Kim, Zubair Hasan, Jung Sik Kim

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10 Scopus citations

Abstract

Eu2+, Dy3+ co-doped, strontium aluminate (Sr4Al14O25) phosphors having high brightness and persistent afterglow were prepared via initial combustion at 600 °C, followed by sintering the resultant combustion ash at different temperatures in a reducing atmosphere of 95% N2 and 5% H2. Boron oxide and urea were used as flux and reducing fuel, respectively. The luminescence properties were investigated by changing the amount of flux, fuel to oxidizer ratio (F/O) and final sintering temperature. The crystallization and surface characterization of the precursor and target powder were investigated by X-ray diffraction (XRD) and field emission-scanning electron microscopy (FE-SEM). The photoluminescence (PL) properties were studied by using a PL spectrometer. The results showed that the single-phase Sr4Al14O25 was formed at 1100 °C and dominated as the temperature was increased to 1500 °C, with a bluish-green emission and a maximum peak at 490 nm, which was attributed to the following typical electronic transition of Eu2+: 4f65d1 → 4f7. Co-doped Dy3+ ions acted as the trapping center by capturing the free holes in the system, thus generating a persistent afterglow. The emission intensity was influenced by the flux amount and the F/O ratio. Nevertheless, the emission intensity and the afterglow time increased with increasing final sintering temperature up to 1500 °C.

Original languageEnglish
Pages (from-to)601-605
Number of pages5
JournalJournal of Ceramic Processing Research
Volume14
Issue number5
StatePublished - 2013

Keywords

  • After glow
  • Combustion process
  • Long phosphorescence phosphor
  • Photoluminescence

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