Mechanism of Energy Transfer and Improvement Moist Stability of BaMg$Al_{10}O_{17}$:$Eu^{2+}$, $Mn^{2+}$ Phosphor

  • Liu, Ru-Shi (Department of Chemistry, National Taiwan University) ;
  • Ke, Wei-Chih (Department of Chemistry, National Taiwan University)
  • 발행 : 2009.10.12

초록

BaMg$Al_{10}O_{17}$ (BAM) co-doped with $Eu^{2+}$ and $Mn^{2+}$ was synthesized in a solid-state reaction and their luminescence properties were investigated as functions of the concentrations of the sensitizer and activator. BAM:$Eu^{2+}$ had a broad blue emission band at 450 nm and BAM:$Mn^{2+}$ exhibited green emission at 514 nm. The energy transfer from $Eu^{2+}$ to $Mn^{2+}$ was mainly of the resonance-type via an electric dipole-quadrupole interaction. Additionally, the addition of various fluxes such as $AlF_3$ and $BaF_2$ in the synthesis improves the moist and thermal stability. This is particularly important for the phosphor in white light emitting diodes (LEDs).

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