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| - Luminescent Properties of Mn2+ in Hexagonal Aluminates under Ultraviolet and VacuumUltraviolet Excitation
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| - Mn2+-doped xBaO·6Al2O3 and BaMgAl10O17 phosphors were prepared by solid-state reaction. The investigationof vacuum ultraviolet (VUV) excitation spectra of these phosphors exhibits that 0.82BaO·6Al2O3:Mn2+ andBaMgAl10O17:Mn2+ have a stronger absorption than BaO·6Al2O3:Mn2+ at about 147 nm. The emission spectraunder VUV excitation demonstrated that 0.82BaOBa·6Al2O3:Mn2+ and BaMgAl10O17:Mn2+ have a higherluminescent intensity than BaO·6Al2O3:Mn2+. The lifetime analysis indicates that they have similar decaytimes, indicating that 0.82BaOBa·6Al2O3:Mn2+ and BaMgAl10O17:Mn2+ can be used as luminescent materialsfor plasma display panels. We observed that the critical concentration of the Mn2+ ions by host excitation isdifferent from that of Mn2+ direct excitation, revealing a different mechanism of energy transfer. The criticaldistance was calculated. A model was suggested to explain the process of the energy transfer from the hostto the Mn2+ ions.
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