Enhancement of fluorescence by Ce3+ doping in green-emitting Ca15(PO4)2(SiO4)6:Eu 2+ phosphor for UV-based w-LEDs

Seyoon Hur, Hee Jo Song, Hee Suk Roh, Dong Wan Kim, Kug Sun Hong

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Ca15(PO4)2(SiO4) 6:Eu2+,Ce3+ phosphor was synthesized by a solid-state reaction. Doping of Ce3+ into the Ca2+ site of the Ca15(PO4)2(SiO4) 6:Eu2+ phosphor enhanced the Eu2+ emission greatly, as observed by measuring the photoluminescence properties and the quantum efficiency levels. The mechanism of the enhancement of the Eu 2+ emission by Ce3+ doping was investigated by comparing the normalized photoluminescence (PL) spectra with the normalized photoluminescence excitation (PLE) spectra and analyzing the absorbance and the fluorescence lifetime of the Ca15(PO4) 2(SiO4)6:Eu2+,Ce3+ phosphors. Furthermore, the thermoluminescence properties were measured to confirm the thermal stability of the synthesized phosphor when exposed to the high junction temperature of recent high-power LED chips, showing a thermal activation energy barrier of 0.213 eV.

Original languageEnglish
Pages (from-to)9791-9795
Number of pages5
JournalCeramics International
Volume39
Issue number8
DOIs
Publication statusPublished - 2013 Dec

Keywords

  • A. Powders: solid state reaction
  • C. Optical properties
  • D. Silicate
  • E. Functional applications

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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