Luminescence and chromaticity of alkaline earth aluminate M xSr1-xAl2O4:Eu2+ (M: Ca,Ba)

Li Te Chen, Chii Shyang Hwang, I. Lei Sun, In Gann Chen

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32 Citations (Scopus)

Abstract

In order to prepare fluorescent material for UV-LED used as illumination light source, two series of Eu2+ doped (1 mol%) alkaline earth aluminate phosphors CaxSr1-xAl 2O4 and BaxSr1-xAl 2O4 were prepared. The crystal structure, relative quantum efficiency(Qr), peak wavelength(λp), color tuning and chromaticity were investigated by XRD patterns and photoluminescence (PL) on samples prepared by solid solution system (s series) and powder mixing system (m series) respectively. For the s series, the synthesized CaxSr 1-xAl2O4:Eu2+ powders show that the structure transforms from monoclinic to hexagonal at x≤0.5, and λp increases from 442.3 to 529.7 nm with decreasing x. For the Ba xSr1-xAl2O4:Eu 2+ system, the structure transforms from monoclinic to hexagonal at x≥0.3, and λp decreases from 520.5 to 502.2 nm continuously from x=0 to 1. The shift in λp could be explained by the crystal field effect, which is affected by different coulomb attractive forces due to the various fraction of alkaline earth cation in the host lattice. Different phosphor properties prepared by either solid solution or powder mixing methods were characterized by chromaticity measurements for both reflective and transmissive modes.

Original languageEnglish
Pages (from-to)12-20
Number of pages9
JournalJournal of Luminescence
Volume118
Issue number1
DOIs
Publication statusPublished - 2006 May 1

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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